Chapter 3. Transmission Components
|
|
- Corey Hubbard
- 5 years ago
- Views:
Transcription
1 Chapter 3. Transmission Components The difference between machine design and structure design An important design problem in a mechanical system is how to transmit and convert power to achieve required motion and function. This task is usually achieved by transmission components and mechanism. This chapter will introduce common transmission components, including Spur gear Helical gear Bevel gear Worm gear Belt and chain Bearings Copyright 00. All rights reserved.
2 Spur Gears Spur gears are the most basic form of gears, which are mainly used to transmit power between parallel axes. Copyright 00. All rights reserved.
3 Involute The profile of a gear tooth is a special designed curve called involute. An involute can be conceptually regarded as an imaginary trajectory generated by a cord unwrapped about a cylinder. cord base circle involute Using involute as the tooth profile, there will be rolling and no sliding between teeth when two spur gears mesh each other (imagine two cans connected by a string). Copyright 00. All rights reserved. 3
4 Spur Gear Terminologies (I) The circle on which the involute is generated is called base circle. When two spur gears mesh each other, there will be two theoretical circles that are tangent to each other. These two circles are called pitch circles, and the diameter of a pitch circle is called pitch diameter. The tangent line between two base circles is called pressure line, and the angle between the tangent line and the horizontal line is called pressure angle. Pressure angle is usually 4.5, 0 and 5 degree, and 0 degree pressure angle is mostly adopted. Copyright 00. All rights reserved. 4
5 Spur Gear Terminologies (II) The distance measured from a point on one tooth to the same corresponding point on the adjacent tooth is called pitch. If the distance is measured on the pitch circle, this distance is called circular pitch (p), which can be expressed as: p The ratio of the pitch diameter to the number of teeth is called module (unit: mm). Module is the index of the size of gears, and ranges from 0.3mm to 5mm. m p m Copyright 00. All rights reserved. 5
6 Spur Gear Terminologies (III) The radial distance between the top of the tooth and the pitch circle is called addendum (a). a m The radial distance from the bottom of the tooth to the pitch circle is called dedendum (d). d. 5m The whole depth is the sum of addendum and dedendum. h r a d. 5m Copyright 00. All rights reserved. 6
7 A Gear Train A gear train is often used to reduce output rotational speed and magnify torque. power source 動力源 coupler 連軸器連軸器 pinion 齒輪 A When a gear and a pinion mesh each other, the tangential velocities at the contact points of the gear and pinion are equal if there is no sliding between the teeth. R G G v t R P P 齒輪 B gear 連軸器 coupler 被驅動機器 driven machine G G P P pinion 小齒輪 gear 大齒輪 Velocity Ratio VR P G R R G P G P G P Copyright 00. All rights reserved. 7
8 Example. Calculate the Train Value 750 rpm VR AB B A 30 VR E E 66 5 idle gear -4.5 rpm VR BC C B idle gear TV VR AB 30 VR BC VR E output rpm Copyright 00. All rights reserved. 8
9 Automotive Manual Transmission The gear ratio is high for the st and nd gear in order to produce enough torque for acceleration. The gear ratio is lower for the 3rd and 4th gear. The gear ratio of the 4th gear is usually :, and is called direct drive. The gear ratio for the 5th (or 6th) gear is less than, and is called over drive (O). The automatic transmission utilizes planetary gear train, which is completely different from manual transmissions. Copyright 00. All rights reserved. 9
10 Example. Automotive Steering System Rack and pinion are used in traditional automotive steering systems. A rack can be seen as a gear with infinite number of teeth. Copyright 00. All rights reserved. 0
11 Planetary Gear System in Automatic Transmission (I) In a planetary gear system, there is a sun gear, a planet pinion, and a ring gear. Among the three axes, one axis is fixed, one is the driving axis, and the other one is the output axis. So there are 6 combinations: combination sun gear fixed output fixed driving output driving planet pinion driving driving output output fixed fixed ring gear output fixed driving fixed driving output gear ratio < <0.5 > > <, R >, R Copyright 00. All rights reserved.
12 Planetary Gear System in Automatic Transmission (II) When the sun gear is fixed (combination and 3): ring planet v v R R ring planet R R planet ring When the ring gear is fixed (combination, 4): sun planet v v R R sun planet R R planet sun stationary 靜止 v stationary st gear Combination 4; nd gear Combination 3; 3 rd gear direct drive; 4 th gear Combination (O); Reverse gear Combination 6. Copyright 00. All rights reserved.
13 Spur Gear Force Analysis The contact force along the pressure line is called normal force W n. The component in the tangential direction is called tangential force W t. The component in the radial direction is called radial force W r. W t is important when calculating the power transmitted, and W r is the force component applying on the shaft of the gear. The relations between W n, W r, and W t are:: Wt W n cos Wr W n sin Wr W t tan Copyright 00. All rights reserved. 3
14 Example 4. Calculate the Loads on Spur Gears (I) Given: Input power rpm. pressure angle ψ=0 and the module m=.5. numbers of teeth of gear A and B are 0 and 60, respectively. Find the normal, radial and tangential forces of gear A and B. Copyright 00. All rights reserved. 4
15 Example 4. Calculate the Loads on Spur Gears (II) m m A A B B d A.5 d A 30mm 0 db.5 db 90mm 60 P(power) T(torque) (rotational speed) (rpm rad 60 sec) 0,000 T A 750 TA 54,567mm 60 B (rpm) 90 0,000 T B TB 63,703mm 60 Copyright 00. All rights reserved. 5
16 Example 4. Calculate the Loads on Spur Gears (III) For Gear A: TA 54,567 W t d A 30 Wt 3638 Wn 387 cos cos 0 W r 387sin 0 34 () For Gear B: W t TB db All loads of Gear B are the same as those of Gear A Copyright 00. All rights reserved. 6
17 Spur Gear Stress Calculation (I) A tooth of a spur gear is often analogous to a cantilever beam when calculating stress. The maximum stress at the root of the gear is: t Wtl Mc 6W tl 3 I Ft Ft The Lewis equation : W t P FY d P d : diametral pitch, the reciprocal of module. Y is called Lewis form factor Copyright 00. All rights reserved. 7
18 Lewis Form Factor umber of tooth Y umber of tooth Y rack Copyright 00. All rights reserved. 8
19 Spur Gear Stress Calculation (II) Five factors are involved when calculating stress for spur gears W P t FY d K t K a K K v s K m K t : stress concentration factor. K a : applied factor, between ~3, depending on the smoothness of the applied load. K s : size factor, this factor must be considered when the module is more than 5. K m : load distribution factor, between ~3, must be considered for large width of tooth. K v : dynamic factor, between 0.5~, depending on the precision of the gears and tangential velocities. Copyright 00. All rights reserved. 9
20 Procedure for Selecting Spur Gears. Select module m of the gear according to the power transmitted and rotational speed.. ecide the number of teeth of the pinion. To avoid interference, 8 is a good number. ecide the number of teeth of the gear according to the required gear ratio. umber of teeth in pinion Max. no. of teeth in gear w/o interference Compute the tangential load W t. 4. Select a proper set of gears from manufacturers catalog. ecide the face width of the gear F. 5. Compute the stress of the gear. Is the stress too high? If so, reselect gears with larger m or F. Copyright 00. All rights reserved. 0
21 Helical gears In transmission applications, helical gears are more popular than spur gears. When transmitting power, there are two or more teeth in contact at the same time because the teeth make an helix angle with the axis. The transmission is more gradual, transmission noise is reduced, and the teeth are worn slower. In transmission, the helical gear will generate an axial force, which is its major drawback. Copyright 00. All rights reserved.
22 Helix Angle and Pressure Angles in Helical Gears The angle between the teeth and the axis of gear is called helix angle, which normally ranges form 5 to 45 degree. There are two pressure angles, transverse plane pressure angle and normal plane pressure angle. The module and circular pitch of helical gears are defined on the transverse plane. transverse plane pressure angle helix angle normal plane pressure angle y Copyright 00. All rights reserved.
23 Helical Gear Force Analysis n W n is the contact force along the pressure line. Its components are three-dimensional: W t is the tangential force, and W r is the radial force, and there is a new axial component W x. W r W n sin n W r W t tan t t W x W t tany W t W n cos n cosy z y x y n, t and y are not independent. tan tan cosy n t Copyright 00. All rights reserved. 3
24 Example 5. Calculate the Loads on Helical Gears For gear A: W t d T For gear B: 3638 () W t T () W n cos n Wt cosy 3638 cos 0 cos () W r W x 4470sin 0 59 () tan30 00 () Copyright 00. All rights reserved. 4
25 Herringbone Gears Herringbone gears have the same advantages of helical gears, while the axial forces cancel out. Copyright 00. All rights reserved. 5
26 Bevel Gears Bevel gears are used to transmit power between two shafts that are perpendicular to each other. The sum of the cone angles of two matching bevel gears has to be 90 degrees. Copyright 00. All rights reserved. 6
27 Bevel Gear Force Analysis W t W n cos W x W n W t W r W n sin cos W r W x W n sin sin W t W r W t tan cos W r W x W t tan sin W x W n W r sin W r Copyright 00. All rights reserved. 7
28 Example 6. Automotive ifferential When the car is on a straight road, tires on both sides have equal traction, and there is no differential action. The gears and the differential case all turn as a unit. When the car turns, the inner tire has a shorter distance to travel and a higher resistance. outer shaft (00+0) rpm 00 rpm differential case inner shaft (00-0) rpm Copyright 00. All rights reserved. 8
29 Worm Gears worm Worm gears transmit power between two perpendicular shafts. Worm gears provide high reduction ratio and transmit high torque, but friction is high because there is sliding between the contact surfaces. There are 3 types of worm gears: the spur gear, the single-enveloping type and the double-enveloping type. worm gear Copyright 00. All rights reserved. 9
30 Single Enveloping and ouble Enveloping Worm Gears Copyright 00. All rights reserved. 30
31 Worm Gear Terminologies The number of teeth of a worm ( w ) is defined as the number of teeth advanced in the worm gear with one revolution of the worm. Usually w =,, or 4. Axial pitch (p x ) is the distance along the axial direction of the worm between each thread. Lead (L) is the distance advanced along the axial direction with one revolution of the worm. lead angle axial pitch, p x lead, L L tan w L p w x w Copyright 00. All rights reserved. 3
32 Worm Gear Force Analysis Tangential force of the worm (W tw ) is equal to the axial force of the worm gear (W xg ). Axial force of the worm (W xw ) is equal to the tangential force of the worm gear (W tg ). Copyright 00. All rights reserved. 3
33 Belts and Chains Belts and chains are flexible transmission components. They can be used to transmit power between two distant shafts, and the center distance is basically adjustable. Belts are used in high rotational speed and low torque applications. Chains are used in low rotational speed and high torque applications. center distance angle of wrap pitch diameter S span Copyright 00. All rights reserved. 33
34 Procedure for Selecting Belts (I) Basic concerns when selecting belts and pulleys: the size and length of the belt, the pitch diameters and center distance of pulleys. Typical catalogue for belt: type Top width thickness angle 3V 3/8 (9.5mm) 5/6 (8.0mm) 5V 5/8 (5.9mm) 7/3 (3.5mm) 40 8V (5.4mm) 7/8 (.mm) Procedure for belt selection:.select proper belt size from the catalogue according to power transmission and applications. Copyright 00. All rights reserved. 34
35 Procedure for Selecting Belts (II).Select proper diameters of pulleys. Large bending force might occur if the pulley is too small. Stress on a belt is caused by tension and bending from wrapping the pulley. Proper linear speed for belt transmission ranges from 5-5 m/sec. Ideal linear speed is 0 m/sec. ecide the diameter of the small pulley from the linear speed and working rotational speed. ecide the diameter of the large pulley from the speed ratio. Pulleys should be of standard specifications and can be found in catalogues. 3.ecide the center distance between pulleys. For proper center distance: Angle of wrap (at least 0 ): C 3 sin C sin C Copyright 00. All rights reserved. 35
36 Copyright 00. All rights reserved. 36 Procedure for Selecting Belts (III) 4.Calculate the length of the belt. 5.ecide the total number of belts needed. C C C C S sin sin C C C C L C C 4 S
37 Procedure for Selecting Chains (I).Select proper chain size (ASI number 5, 30, 40,, 40) from the catalogue according to power transmission and applications..ecide the number of teeth of the sprocket ormally, the number of teeth of the small sprocket should be at least 7 and the large one at most 0, unless the speed is less than 00 rpm. The maximum speed ratio for chain transmission is 7.0. Multi-stage speed reduction should be used if higher speed ratio is desired. Copyright 00. All rights reserved. 37
38 Copyright 00. All rights reserved ecide the center distance of two sprockets. Center distance should be 30 to 50 times of the pitch. The angle of wrap of the small sprocket should not be less than 0 degree. 4. Calculate the length of the chain. The unit of chain length is pitch, and is an even number. With the calculated length L, determine the center distance C again. 5. ecide the number of chains we need. Lubrication, such as oil-dripping, oil-bathing or oil-spraying is important. C C L L L C Procedure for Selecting Chains (II)
39 Bearings (I) Bearings are used in rotational shafts to sustain axial and radial loads and permits relative motion between shafts and housing. There are two major types of bearings, rolling contact bearing and journal bearing. A rolling contact bearing usually consist of an inner race, an outer race, a retainer and rollers or balls. Three important concerns for selecting bearings: the capability to sustain radial load, axial load, and misalignment. Single-row, deep-groove ball bearing animation inner race Angular contact ball bearing outer race rollers retainer Copyright 00. All rights reserved. 39
40 Bearings (II) Self-aligning bearing Cylindrical roller bearing, needle bearing Copyright 00. All rights reserved. 40
41 Bearings (III) Spherical roller bearing Taper roller bearing Copyright 00. All rights reserved. 4
42 Bearings Capability to Sustain Loads Type Capability to sustain loads radial load axial load Misalignment Single-row, deep-groove ball bearing Good Acceptable Acceptable Angular contact ball bearing Good Excellent Bad Self-aligning bearing Good Acceptable Excellent Cylindrical roller bearing Excellent Bad Acceptable eedle bearing Excellent Acceptable Acceptable Spherical roller bearing Excellent Good Excellent Taper roller bearing Excellent Excellent Bad Copyright 00. All rights reserved. 4
43 Special Bearings Thrust bearing Linear bearing Copyright 00. All rights reserved. 43
44 Selecting Rolling Contact Bearings (I) Basic static load rating and basic dynamic load rating are the two most important specifications for rolling contact bearings. Basic static load rating is the maximum static load a bearing can sustain without permanent deformation. Basic dynamic load rating means that, under this dynamic load, the L 0 life of a bearing is,000,000 revolutions. Relation between loads and life of bearings: k=3.00 for ball bearing and k=3.33 for roller bearings Rated life, L 0 life: under certain rated load, 0% of the bearings will fail after L 0 life. L L P P k Copyright 00. All rights reserved. 44
45 Selecting Rolling Contact Bearings (II) When there are both radial and axial loads on the bearing, we need to calculate the equivalent load. P VXR YT R: radial load T: axial load V: rotation factor (V=.0 when the outer ring fixed; V=. when the inner ring fixed) Copyright 00. All rights reserved. 45
46 Selecting Rolling Contact Bearings (III) T/C 0 e T/Re T/Re X Y X Y T/C should be at least 04; C 0 is basic static load rating Copyright 00. All rights reserved. 46
47 Journal Bearings In journal bearings, there are no rolling contact elements. Rotation of the shaft is enable by lubrication. The friction of journal bearings depends on the coefficient of viscosity (μ), rotational speed (n) and pressure of the lubricant inside the journal bearing (p). n These three factors are usually combined into a bearing parameter. p Copyright 00. All rights reserved. 47
48 Bearing parameter vs. Coefficient of Friction The lubrication of journal bearings can be classified into boundary lubrication, mixed-film lubrication, and hydrodynamic lubrication. We hope to operate in hydrodynamic lubrication. Copyright 00. All rights reserved. 48
GEAR CONTENTS POWER TRANSMISSION GEAR TYPES OF GEARS NOMENCLATURE APPLICATIONS OF GEARS VELOCITY RATIO GEAR TRAINS EXAMPLE PROBLEMS AND QUESTIONS
GEAR CONTENTS POWER TRANSMISSION GEAR TYPES OF GEARS NOMENCLATURE APPLICATIONS OF GEARS VELOCITY RATIO GEAR TRAINS EXAMPLE PROBLEMS AND QUESTIONS GEAR.. Power transmission is the movement of energy from
More information1/2/2015 2:04 PM. Chapter 13. Gears General. Dr. Mohammad Suliman Abuhaiba, PE
Chapter 13 Gears General 1 2 Chapter Outline 1. Types of Gears 2. Nomenclature 3. Conjugate Action 4. Involute Properties 5. Fundamentals 6. Contact Ratio 7. Interference 8. The Forming of Gear Teeth 9.
More informationIntroduction. Kinematics and Dynamics of Machines. Involute profile. 7. Gears
Introduction The kinematic function of gears is to transfer rotational motion from one shaft to another Kinematics and Dynamics of Machines 7. Gears Since these shafts may be parallel, perpendicular, or
More information12/6/2013 9:09 PM. Chapter 13. Gears General. Dr. Mohammad Suliman Abuhaiba, PE
Chapter 13 Gears General 1 2 Chapter Outline 1. Types of Gears 2. Nomenclature 3. Conjugate Action 4. Involute Properties 5. Fundamentals 6. Contact Ratio 7. Interference 8. The Forming of Gear Teeth 9.
More informationLecture (7) on. Gear Measurement. By Dr. Emad M. Saad. Industrial Engineering Dept. Faculty of Engineering. Fayoum University.
1 Lecture (7) on Gear Measurement Fayoum University By Dr. Emad M. Saad Industrial Engineering Dept. Faculty of Engineering Fayoum University Faculty of Engineering Industrial Engineering Dept. 2015-2016
More informationChapter 8 Kinematics of Gears
Chapter 8 Kinematics of Gears Gears! Gears are most often used in transmissions to convert an electric motor s high speed and low torque to a shaft s requirements for low speed high torque: Speed is easy
More informationChapter seven. Gears. Laith Batarseh
Chapter seven Gears Laith Batarseh Gears are very important in power transmission between a drive rotor and driven rotor What are the functions of gears? - Transmit motion and torque (power) between shafts
More informationCH#13 Gears-General. Drive and Driven Gears 3/13/2018
CH#13 Gears-General A toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion The gear set transmits rotary motion and force. Gears are used
More informationWhat are the functions of gears? What is gear?
8//0 hapter seven Laith atarseh are very important in power transmission between a drive rotor and driven rotor What are the functions of gears? - Transmit motion and torque (power) between shafts - Maintain
More informationPart VII: Gear Systems: Analysis
Part VII: Gear Systems: Analysis This section will review standard gear systems and will provide the basic tools to perform analysis on these systems. The areas covered in this section are: 1) Gears 101:
More informationGear Tooth Geometry - This is determined primarily by pitch, depth and pressure angle
Gear Tooth Geometry - This is determined primarily by pitch, depth and pressure angle Addendum: The radial distance between the top land and the pitch circle. Addendum Circle: The circle defining the outer
More informationSheet 1 Variable loading
Sheet 1 Variable loading 1. Estimate S e for the following materials: a. AISI 1020 CD steel. b. AISI 1080 HR steel. c. 2024 T3 aluminum. d. AISI 4340 steel heat-treated to a tensile strength of 1700 MPa.
More informationDEPARTMENT OF MECHANICAL ENGINEERING Subject code: ME6601 Subject Name: DESIGN OF TRANSMISSION SYSTEMS UNIT-I DESIGN OF TRANSMISSION SYSTEMS FOR FLEXIBLE ELEMENTS 1. What is the effect of centre distance
More informationKINGS COLLEGE OF ENGINEERING DEPARTMENT OF MECHANICAL ENGINEERING
KINGS COLLEGE OF ENGINEERING DEPARTMENT OF MECHANICAL ENGINEERING QUESTION BANK Sub Code/Name: ME 1352 DESIGN OF TRANSMISSION SYSTEMS Year/Sem: III / VI UNIT-I (Design of transmission systems for flexible
More information(POWER TRANSMISSION Methods)
UNIT-5 (POWER TRANSMISSION Methods) It is a method by which you can transfer cyclic motion from one place to another or one pulley to another pulley. The ways by which we can transfer cyclic motion are:-
More informationChapter 1 Gear Design
Chapter 1 Gear Design GTU Paper Analysis Sr. No. Questions Nov 16 May 17 Nov 17 May 18 Theory 1. Explain the following terms used in helical gears: (a) Helix angle; (b) Normal pitch; (c) Axial pitch; (d)
More informationME6401 KINEMATICS OF MACHINERY UNIT- I (Basics of Mechanism)
ME6401 KINEMATICS OF MACHINERY UNIT- I (Basics of Mechanism) 1) Define resistant body. 2) Define Link or Element 3) Differentiate Machine and Structure 4) Define Kinematic Pair. 5) Define Kinematic Chain.
More informationKINEMATICS OF MACHINARY UBMC302 QUESTION BANK UNIT-I BASICS OF MECHANISMS PART-A
KINEMATICS OF MACHINARY UBMC302 QUESTION BANK UNIT-I BASICS OF MECHANISMS PART-A 1. Define the term Kinematic link. 2. Classify kinematic links. 3. What is Mechanism? 4. Define the terms Kinematic pair.
More informationInstantaneous Centre Method
Instantaneous Centre Method The combined motion of rotation and translation of the link AB may be assumed to be a motion of pure rotation about some centre I, known as the instantaneous centre of rotation.
More information2. a) What is pantograph? What are its uses? b) Prove that the peaucellier mechanism generates a straight-line motion. (5M+10M)
Code No: R22032 R10 SET - 1 1. a) Define the following terms? i) Link ii) Kinematic pair iii) Degrees of freedom b) What are the inversions of double slider crank chain? Describe any two with neat sketches.
More informationDifferent types of gears. Spur gears. Idler gears. Worm gears. Bevel gears. Belts & Pulleys
GEARS Robot Gears By using different gear diameters, you can exchange between rotational (or translation) velocity and torque. by looking at the motor datasheet you can determine the output velocity and
More informationCatalog Q Conversion For those wishing to ease themselves into working with metric gears
1.3.4 Conversion For those wishing to ease themselves into working with metric gears by looking at them in terms of familiar inch gearing relationships and mathematics, Table 1-5 is offered as a means
More information11. GEAR TRANSMISSIONS
11. GEAR TRANSMISSIONS 11.1. GENERAL CONSIDERATIONS Gears are one of the most important elements used in machinery. There are few mechanical devices that do not have the need to transmit power and motion
More informationEffect of Geometry Factor I & J Factor Multipliers in the performance of Helical Gears
Effect of Geometry Factor I & J Factor Multipliers in the performance of Helical Gears 1 Amit D. Modi, 2 Manan B. Raval, 1 Lecturer, 2 Lecturer, 1 Department of Mechanical Engineering, 2 Department of
More informationBearings. Rolling-contact Bearings
Bearings A bearing is a mechanical element that limits relative motion to only the desired motion and at the same time it reduces the frictional resistance to the desired motion. Depending on the design
More informationLecture 13 BEVEL GEARS
Lecture 13 BEVEL GEARS CONTENTS 1. Bevel gear geometry and terminology 2. Bevel gear force analysis 3. Bending stress analysis 4. Contact stress analysis 5. Permissible bending fatigue stress 6. Permissible
More informationChapter 11 Rolling Contact Bearings
Chapter 11 Rolling Contact Bearings 1 2 Chapter Outline Bearing Types Bearing Life Bearing Load Life at Rated Reliability Bearing Survival: Reliability versus Life Relating Load, Life, and Reliability
More informationCode No: R Set No. 1
Code No: R05310304 Set No. 1 III B.Tech I Semester Regular Examinations, November 2007 KINEMATICS OF MACHINERY ( Common to Mechanical Engineering, Mechatronics, Production Engineering and Automobile Engineering)
More informationBevel Gears n A Textbook of Machine Design
080 n A Textbook of Machine Design C H A P T E R 30 Bevel Gears. Introduction.. Classification of Bevel Gears. 3. Terms used in Bevel Gears. 4. Determination of Pitch Angle for Bevel Gears. 5. Proportions
More informationGEARING. Theory of. Stephen. Kinetics, Geometry, and Synthesis. P. Radzevich. /Ov CRC Press yc*** J Taylor& Francis Croup Boca Raton
Theory of GEARING Kinetics, Geometry, and Synthesis Stephen P. Radzevich /Ov CRC Press yc*** J Taylor& Francis Croup Boca Raton London New York CRC Press is an imprint of the Taylor & Francis Group, an
More informationGraphical representation of a gear
Homework 4 Gears Gears are designed to transmit rotary motion. Often they are arranged in a gear train (meshed together). Gear trains provide a change in speed, torque (turning force) and direction (clockwise
More information11/23/2013. Chapter 13. Gear Trains. Dr. Mohammad Suliman Abuhiba, PE
Chapter 13 Gear Trains 1 2 13.2. Types of Gear Trains 1. Simple gear train 2. Compound gear train 3. Reverted gear train 4. Epicyclic gear train: axes of shafts on which the gears are mounted may move
More informationUNIT -I. Ans: They are specified by the no. of strands & the no. of wires in each strand.
VETRI VINAYAHA COLLEGE OF ENGINEERING AND TECHNOLOGY, THOTTIAM, NAMAKKAL-621215. DEPARTMENT OF MECHANICAL ENGINEERING SIXTH SEMESTER / III YEAR ME6601 DESIGN OF TRANSMISSION SYSTEM (Regulation-2013) UNIT
More informationEngineering Information
Engineering nformation Gear Nomenclature ADDENDUM (a) is the height by which a tooth projects beyond the pitch circle or pitch line. BASE DAMETER (D b ) is the diameter of the base cylinder from which
More informationBasic Static Load Rating of Rolling Contact Bearings
Basic Static Load Rating of Rolling Contact Bearings The load carried by a non-rotating bearing is called a static load. The basic static load rating is defined as the static radial load (in case of radial
More informationDesign and Analysis of Six Speed Gear Box
Design and Analysis of Six Speed Gear Box Ujjayan Majumdar 1, Sujit Maity 2, Gora Chand Chell 3 1,2 Student, Department of Mechanical Engineering, Jalpaiguri Government Engineering College, Jalpaiguri,
More informationCopyright Notice. Small Motor, Gearmotor and Control Handbook Copyright Bodine Electric Company. All rights reserved.
Copyright Notice Small Motor, Gearmotor and Control Handbook Copyright 1993-2003 Bodine Electric Company. All rights reserved. Unauthorized duplication, distribution, or modification of this publication,
More informationCh# 11. Rolling Contact Bearings 28/06/1438. Rolling Contact Bearings. Bearing specialist consider matters such as
Ch# 11 Rolling Contact Bearings The terms rolling-contact bearings, antifriction bearings, and rolling bearings are all used to describe the class of bearing in which the main load is transferred through
More informationMechanism Feasibility Design Task
Mechanism Feasibility Design Task Dr. James Gopsill 1 Contents 1. Last Week 2. Types of Gear 3. Gear Definitions 4. Gear Forces 5. Multi-Stage Gearbox Example 6. Gearbox Design Report Section 7. This Weeks
More informationME6601 DESIGN OF TRANSMISSION SYSTEMS
SYED AMMAL ENGINEERING COLLEGE (Approved by the AICTE, New Delhi, Govt. of Tamilnadu and Affiliated to Anna University, Chennai) Established in 1998 - An ISO 9001:2008 Certified Institution Dr. E.M.Abdullah
More informationBRCM COLLEGE OF ENGINEERING & TECHNOLOGY BAHAL, BHIWANI Practical Experiment Instructions Sheet
BRCM COLLEGE OF KOM ME- 212 F KINEMATICS OF MACHINES LAB BRANCH-ME List of Experiments : 1. To study various types of Kinematic links, pairs, chains and Mechanisms. 2. To study inversions of 4 Bar Mechanisms,
More informationDEPARTMENT OF MECHANICAL ENGINEERING ME6401- KINEMATICS OF MACHINERY QUESTION BANK Part-A Unit 1-BASICS OF MECHANISMS 1. Define degrees of freedom. 2. What is meant by spatial mechanism? 3. Classify the
More informationUnit IV GEARS. Gallery
Gallery Components of a typical, four stroke cycle, DOHC piston engine. (E) Exhaust camshaft, (I) Intake camshaft, (S) Spark plug, (V) Valves, (P) Piston, (R) Connecting rod, (C) Crankshaft, (W) Water
More informationGear Engineering Data. Spur Gear Gear Formulas Drive Selection Horsepower and Torque Tables
Engineering Gear Engineering Data Spur Gear Gear Formulas Drive Selection Horsepower and Torque Tables G-79 Gear Selection Stock Spur Gear Drive Selection When designing a stock gear drive using the horsepower
More informationBevel Gears. Fig.(1) Bevel gears
Bevel Gears Bevel gears are cut on conical blanks to be used to transmit motion between intersecting shafts. The simplest bevel gear type is the straighttooth bevel gear or straight bevel gear as can be
More informationBibliography. [1] Buckingham, Earle: "Analytical Mechanics of Gears", McGraw-Hill, New York, 1949, and republished by Dover, New York, 1963.
Bibliography The first five references listed are books on gearing. Some of them deal not only with the geometry, but also with many other aspects of gearing. However, the books are included in this bibliography
More informationGearheads H-51. Gearheads for AC Motors H-51
Technical Reference H-51 for AC Since AC motor gearheads are used continuously, primarily for transmitting power, they are designed with priority on ensuring high permissible torque, long life, noise reduction
More informationCHENDU COLLEGE OF ENGINEERING & TECHNOLOGY DEPARTMENT OF MECHANICAL ENGINEERING QUESTION BANK IV SEMESTER
CHENDU COLLEGE OF ENGINEERING & TECHNOLOGY DEPARTMENT OF MECHANICAL ENGINEERING QUESTION BANK IV SEMESTER Sub Code: ME 6401 KINEMATICS OF MACHINERY UNIT-I PART-A 1. Sketch and define Transmission angle
More informationCHAPTER 5 PREVENTION OF TOOTH DAMAGE IN HELICAL GEAR BY PROFILE MODIFICATION
90 CHAPTER 5 PREVENTION OF TOOTH DAMAGE IN HELICAL GEAR BY PROFILE MODIFICATION 5.1 INTRODUCTION In any gear drive the absolute and the relative transmission error variations normally increases with an
More informationChapter 11 Rolling Contact Bearings
Chapter 11 Rolling Contact Bearings 1 2 Chapter Outline 3 Overview The term rolling bearing is used to describe class of bearing in which the main load is transferred through elements in rolling contact
More informationBasic Fundamentals of Gear Drives
Basic Fundamentals of Gear Drives Course No: M06-031 Credit: 6 PDH A. Bhatia Continuing Education and Development, Inc. 9 Greyridge Farm Court Stony Point, NY 10980 P: (877) 322-5800 F: (877) 322-4774
More informationSECTION 8 BEVEL GEARING
SECTION 8 BEVEL GEARING For intersecting shafts, bevel gears offer a good means of transmitting motion and power. Most transmissions occur at right angles, Figure 8-1, but the shaft angle can be any value.
More informationPower Transmission Elements II: Gears and Bearings. Lecture 3, Week 4
Power Transmission Elements II: Gears and Bearings Lecture 3, Week 4 Announcements Lab 4 need to finish by Friday Friday lab can get started today Project proposal Due at 23:59 tonight Email to us: matthewg@mit.edu,
More informationChain Drives. Pitch. Basic Types -There are six major types of power-
1 2 Power transmission chains have two things in common; side bars or link plates, and pin and bushing joints. The chain articulates at each joint to operate around a toothed sprocket. The pitch of the
More informationTooth thickness Dedendum. Addendum. Centre distance Nominal
FORMULAS SPUR GEARS TO FIND:- PCD ØD MODULE No. of TEETH CP ADDENDUM DEDENDUM MODULE No. of TEETH x MOD (mm) (No. of TEETH + ) x MOD (mm) 5.4 MODULE CP π (mm) PCD MODULE (mm) MODULE x π (mm) MODULE (mm)
More informationCHENDU COLLEGE OF ENGINEERING & TECHNOLOGY DEPARTMENT OF MECHANICAL ENGINEERING QUESTION BANK
CHENDU COLLEGE OF ENGINEERING & TECHNOLOGY DEPARTMENT OF MECHANICAL ENGINEERING QUESTION BANK Sub Code: ME 2342 DESIGN OF TRANSMISSION SYSTEM UNIT - I 1. How the bevel gears are classified? Explain with
More informationVALLIAMMAI ENGINEERING COLLEGE DEPARTMENT OF MECHANICAL ENGINEERING ME6401- KINEMATICS OF MACHINERY QUESTION BANK PART-A Unit 1-BASICS OF MECHANISMS 1. Define degrees of freedom. BT1 2. Describe spatial
More informationSpur Gears. Helical Gears. Bevel Gears. Worm Gears
Spur s General: Spur gears are the most commonly used gear type. They are characterized by teeth which are perpendicular to the face of the gear. Spur gears are by far the most commonly available, and
More informationMechanical Power Transmission. September 16, 2008
2008 TE Sessions Supported by Mechanical Power Transmission September 16, 2008 www.robojackets.org Goals Hand out kits to teams that don t have one. More physics concepts and terms Understanding key devices
More informationTherefore, it is the general practice to test the tooth contact and backlash with a tester. Figure 19-5 shows the ideal contact for a worm gear mesh.
19. Surface Contact Of Worm And Worm Gear There is no specific Japanese standard concerning worm gearing, except for some specifications regarding surface contact in JIS B 1741. Therefore, it is the general
More informationSYED AMMAL ENGINEERING COLLEGE
SYED AMMAL ENGINEERING COLLEGE (Approved by the AICTE, New Delhi, Govt. of Tamilnadu and Affiliated to Anna University, Chennai) Established in 1998 - An ISO 9001:2000 Certified Institution Dr. E.M.Abdullah
More informationThe Geometry of Involute Gears
The Geometry of Involute Gears J.R. Colbourne The Geometry of Involute Gears With 217 Illustrations Springer-Verlag New York Berlin Heidelberg London Paris Tokyo J.R. Colbourne Department of Mechanical
More informationMarine Engineering Exam Resource Review of Couplings
1. What are rigid couplings used for? Used to join drive shafts together. True alignment and rigidity are required. Example Drive shafts and production lines, bridge cranes, solid shaft that needs to be
More informationIntroduction to Gear Design
Introduction to Gear Design Course No: M03-016 Credit: 3 PDH Robert P. Tata, P.E. Continuing Education and Development, Inc. 9 Greyridge Farm Court Stony Point, NY 10980 P: (877) 322-5800 F: (877) 322-4774
More informationTheory of Machines. CH-1: Fundamentals and type of Mechanisms
CH-1: Fundamentals and type of Mechanisms 1. Define kinematic link and kinematic chain. 2. Enlist the types of constrained motion. Draw a label sketch of any one. 3. Define (1) Mechanism (2) Inversion
More informationAdvantages and Disadvantages of Rolling Contact Bearings Over Sliding Contact Bearings
Advantages and Disadvantages of Rolling Contact Bearings Over Sliding Contact Bearings Advantages 1. Low starting and running friction except at very high speeds. 2. Ability to withstand momentary shock
More informationTECHNICAL INFORMATION
General Nomenclature Spherical Roller Bearings The spherical roller bearing is a combination radial and thrust bearing designed for taking misalignment under load When loads are heavy, alignment of housings
More informationCLASSIFICATION OF ROLLING-ELEMENT BEARINGS
CLASSIFICATION OF ROLLING-ELEMENT BEARINGS Ball bearings can operate at higher speed in comparison to roller bearings because they have lower friction. In particular, the balls have less viscous resistance
More informationGear Measurement. Lecture (7) Mechanical Measurements
18 3. Gear profile checking 2. Involute measuring machine In this method the gear is held on a mandrel and circular disc of same diameter as the base circle of gear for the measurement is fixed on the
More informationSKF FAG Timken NSK NTN
BEARINGS Rolling vs. Sliding Provides support for machine elements, while allowing smooth motion. µ = 0.001-0.005 Plain Bearings (Sliding/Hydrodynamic/ Journal/Sleeve) Rolling-Element Bearings Types Selection
More information1.6 Features of common gears
1.6 Features of common gears Chapter 1.2 covered briefly on types of gear. The main gear features are explained here. Helical gear Helical gear has characteristics of transferability of larger load, less
More informationANALYSIS OF STRESSES AND DEFLECTIONS IN SPUR GEAR
International Journal of Mechanical Engineering and Technology (IJMET) Volume 8, Issue 4, April 2017, pp. 461 473 Article ID: IJMET_08_04_050 Available online at http://www.iaeme.com/ijmet/issues.asp?jtype=ijmet&vtype=8&itype=4
More informationTECHNOLOGY MECHANISMS
TECHNOLOGY MECHANISMS 3º ESO IES CHAN DO MONTE URTAZA 1 WHAT IS A MECHANISM? Mechanism are devices that have been designed to make jobs easier. They all have certain things in common: They involve some
More informationFIRSTRANKER. 2. (a) Distinguish (by neat sketches) betweenpeaucellier mechanism and Hart mechanism.
Code No: 07A51404 R07 Set No. 2 IIIB.Tech I Semester Examinations,May 2011 KINEMATICS OF MACHINERY Mechatronics Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks 1.
More informationT25 T25 T25 T27 T27 T28 T28 T28 T28 T29 T29 T29 T31 T37 T37 T38 T T T48
1.0 INTRODUCTION 2.0 BASIC GEOMETRY OF SPUR GEARS 2.1 Basic Spur Gear Geometry 2.2 The Law of Gearing 2.3 The Involute Curve 2.4 Pitch Circles 2.5 Pitch 2.5.1 Circular Pitch 2.5.2 Diametral Pitch 2.5.3
More informationFig. 1 Two stage helical gearbox
Lecture 17 DESIGN OF GEARBOX Contents 1. Commercial gearboxes 2. Gearbox design. COMMERICAL GEARBOX DESIGN Fig. 1 Two stage helical gearbox Fig. 2. A single stage bevel gearbox Fig. 4 Worm gearbox HELICAL
More information1. (a) Discuss various types of Kinematic links with examples. (b) Explain different types of constrained motions with examples.
Code No: RR310304 Set No. 1 III B.Tech I Semester Supplementary Examinations, February 2007 KINEMATICS OF MACHINERY ( Common to Mechanical Engineering, Mechatronics and Production Engineering) Time: 3
More information1.8 Rack shift of the gear
1.8 Rack shift of the gear Undercut When Number of teeth is belo minimum as shon in Fig. 3, part of dedendum is no longer an Involute curve but ill look like a shape scooped out by cutter tool. Refer to
More informationMethodology for Designing a Gearbox and its Analysis
Methodology for Designing a Gearbox and its Analysis Neeraj Patel, Tarun Gupta B.Tech, Department of Mechanical Engineering, Maulana Azad National Institute of Technology, Bhopal, India. Abstract Robust
More informationNPTEL. Mechanics of Textile Machinery - Web course. Textile Engineering. COURSE OUTLINE. Machine elements and drives
NPTEL Syllabus Mechanics of Textile Machinery - Web course COURSE OUTLINE Machine elements and drives Introduction to drives, selection of drives, primary machine elements, special purpose drives and devices
More informationQUESTION BANK Chapter:-6 Design of IC Engine Components
QUESTION BANK Chapter:-6 Design of IC Engine Components Que:-1 Design a cast iron piston for a single acting four stroke diesel engine for following data: Cylinder bore = 100 mm, stroke = 125 mm, Pmax
More informationSTATIC ANALYSIS ON BEVEL GEAR USING STRUCTURAL STEEL, GRAY CAST IRON, AND STAINLESS STEEL
STATIC ANALYSIS ON BEVEL GEAR USING STRUCTURAL STEEL, GRAY CAST IRON, AND STAINLESS STEEL Prateek Srivastava 1, Rishabh 2, Zubair Irshad 3, Pankaj Kumar Singh 4 Graduate Students Mechanical Engineering,
More informationThermal Analysis of Helical and Spiral Gear Train
International Journal for Ignited Minds (IJIMIINDS) Thermal Analysis of Helical and Spiral Gear Train Dr. D V Ghewade a, S S Nagarale b & A N Pandav c a Principal, Department of Mechanical, GENESIS, Top-Kolhapur,
More informationSpiroid High Torque Skew Axis Gearing A TECHNICAL PRIMER F. EVERTZ, M. GANGIREDDY, B. MORK, T. PORTER & A. QUIST
2016 Spiroid High Torque Skew Axis Gearing A TECHNICAL PRIMER F. EVERTZ, M. GANGIREDDY, B. MORK, T. PORTER & A. QUIST Table of Contents INTRODUCTION PAGE 02 SPIROID GEAR SET CHARACTERISTICS PAGE 03 BASIC
More informationProgram Internal Gear Set Profile Shift Coefficients With Zero Backlash Introduction
Program 60-107 Internal Gear Set Profile Shift Coefficients With Zero Backlash Introduction The purpose of this model is to provide data for a gear set when the tooth thickness and/or the center distance
More informationModel Library Power Transmission
Model Library Power Transmission The Power Transmission libraries in SimulationX support the efficient modeling and analysis of mechanical powertrains as well as the simulation-based design of controlled
More information1 135 teeth to rack
1. A spur gear with 46 teeth, 2.5 module has to be cut on a column and knee type horizontal milling machine with a rotary disc type form gear milling cutter. The 2.5 module cutter no. 3 is used on a blank
More informationDriver Driven. InputSpeed. Gears
Gears Gears are toothed wheels designed to transmit rotary motion and power from one part of a mechanism to another. They are fitted to shafts with special devices called keys (or splines) that ensure
More informationUNIT III TRANSMISSION SYSTEMS CONTENTS: Clutch-types and construction Gear boxes- manual and automatic Gear shift mechanisms Over drive Transfer box
UNIT III TRANSMISSION SYSTEMS CONTENTS: Clutch-types and construction Gear boxes- manual and automatic Gear shift mechanisms Over drive Transfer box Fluid flywheel Torque converter Propeller shaft Slip
More informationRobot components: Actuators
Robotics 1 Robot components: Actuators Prof. Alessandro De Luca Robotics 1 1 Robot as a system program of tasks commands Robot actions working environment mechanical units supervision units sensor units
More informationContact Analysis of a Helical Gear with Involute Profile
Contact Analysis of a Helical Gear with Involute Profile J. Satish M. Tech (CAD/CAM) Nova College of Engineering and Technology, Jangareddigudem. ABSTRACT Gears are toothed wheels designed to transmit
More informationShifting gears: simplify your design with slewing ring bearings
White Paper Shifting gears: simplify your design with slewing ring bearings Scott Hansen, VP, Manufacturing Planning, Kaydon Bearings, an SKF Group company A slewing ring bearing has rolling elements designed
More informationInternal Gears. No. of teeth (60) Module (1) Others (Ring Gear) Type (Internal Gear) Material (S45C)
ph: (410)8-10 (0)68-180 fx: (410)8-142 (0)872-929 rfq form: http://mdmetric.com/rfq.htm Internal Internal Miter CP Racks & Pinions Racks Helical Spur SI Steel Internal SIR Steel Ring m0. ~ Page 184 m2
More informationDesign 3. Bearings(1/2) Bearings. Bearings. Provides support for rotating machine elements. Contents. Hamidreza G.Darabkhani. Course Leader: A.
Design 3 Bearings Hamidreza G.Darabkhani Course Leader: A. Starr Contents Bearings Bearings Classification Loads on Bearings Rolling elements bearings Ball bearings Roller bearings Needle bearings Linear
More informationwe will learn how to conduct force and torque analysis on gears in order to calculate bearing
8.1 Introduction to Gears Gears are used to transmit motion and torque from one shaft to another. In this section we will discuss the kinematics of gears; that is, the motion relationships between gears.
More informationTRANSLATION (OR LINEAR)
5) Load Bearing Mechanisms Load bearing mechanisms are the structural backbone of any linear / rotary motion system, and are a critical consideration. This section will introduce most of the more common
More informationMECHANICAL DRIVES 1 SPUR GEAR DRIVES LEARNING ACTIVITY PACKET BB502-XD06AEN
MECHANICAL DRIVES 1 LEARNING ACTIVITY PACKET SPUR GEAR DRIVES BB502-XD06AEN LEARNING ACTIVITY PACKET 6 SPUR GEAR DRIVES INTRODUCTION This LAP will begin the study of the third type of adjacent shaft-to-shaft
More informationPlanetary Roller Type Traction Drive Unit for Printing Machine
TECHNICAL REPORT Planetary Roller Type Traction Drive Unit for Printing Machine A. KAWANO This paper describes the issues including the rotation unevenness, transmission torque and service life which should
More informationLectures on mechanics
Lectures on mechanics (lesson #3) francesco.becchi@telerobot.it LESSONS TIME TABLE (pls. take note) 28/11 h9/12- mech components 1 (3h) 4/12 h9/12 mech components 2 (3h) 11/12 h9/12 mech technologies (3h)
More informationGear Drives. A third gear added to the system will rotate in the same direction as the drive gear Equal diameters = Equal number of teeth = Same speed
Gear Drive Systems Gear Drives Gear Drive: Synchronous mechanical drive that uses gears to transfer power Gear: A toothed wheel that meshes with other toothed wheels to transfer rotational power Pinion
More information