Engine, Pump and Compressor Power Take-Off Clutches

Transcription

1 L T R I N U S T R I L M O T I O N ngine, Pump and ompressor Power Take-Off lutches

2 ngine, Pump and ompressor lutches ontents pplication xamples...2 Selection...3 Types of Shafts and rives...5 lectrical Ratings...6 lutch Mounting...6 Tapered ore lutches: Flange Mount, Single Row earing...7 Flange or Yoke irect rive, ouble Row earing...8 Flange Mount, ouble Row earing Special onstruction, Flange Mount, ouble Row earing...5 Straight ore lutches: earing Mount Special onstruction Shaft Mount Glossary...25 Technical onsiderations...26 Part Number Index...27 Mobile Power pplication ata Form...29 pplication xamples Principles of Operation n electric clutch operates on the basic principle of magnetic attraction. losing a switch sends electric current to an electromagnet or field, producing a strong magnetic attraction which concentrates around the magnetic poles of the field. The magnetic attraction jumps the small air gap between the field and the rotor, effectively making the rotor a spinning magnet. This magnet attracts the armature, grips it tightly and causes it to turn with the rotor. Opening the switch turns off the magnet, disengaging the clutch. Magnetic ircuit The heart of an electric clutch is its field assembly, with an electric coil to produce magnetism and iron magnet housing to direct that magnetism through the rotor to most effectively attract the armature. The illustration on the right shows how the rotor and armature surfaces of Warner lectric clutches are slotted and grooved. Magnetism, also called magnetic flux, concentrates at the poles of the field housing and jumps to the outer rims of the rotor. The flux passes through areas where contact is most intimate between the armature and rotor faces. oncentrating the magnetic attraction at these poles rather than over the entire face creates a strong attraction between the armature and rotor. The result is a great deal of torque in a small clutch. oupling a clutch with a hydraulic pump mounted on a truck engine offers advantages in numerous other mobile applications, such as tire changing trucks, refuse disposal trucks, scissor lift airliner food delivery trucks and cherry picker type man lifts.

3 ngine, Pump and ompressor lutches- Selection rmature ssembly Rotor Pulley ssembly ir Gap Field ssembly lectric clutches provide for remote control of the feed and chopping mechanisms on straw choppers, insulation blowers, and salt spreaders. n engine mounted pump on this highway maintenance truck supplies hydraulic pressure for the sand spreader. Mounting an electric clutch on the pump will increase equipment life, improve machine efficiency, and allow the operator to engage and disengage the hydraulic system on demand. P-09-W 3/8 2

4 ngine, Pump and ompressor lutches- Selection The Right lutch For Your pplication Several specifications must be determined to select the right Warner lectric clutch for a particular application. ompile these from the selection factors discussed on the next four pages and compare them to the clutch specifications found on pages 7 through 24 to find the correct clutch for your application. lutch imensions Overall or envelope dimensions of a clutch being considered for an application must be noted to ensure that the clutch will fit into the space allotted. hoosing the orrect Size lutch Torque and horsepower calculations are important in choosing the right clutch for your application. Two important factors needed to determine the static torque required for an application are the driven machine s horsepower and clutch operating speed. Locate horsepower and clutch RPM on their respective columns in the accompanying chart. raw a straight line between the two points. The torque is the numerical value read from where this line intersects the TORQU column. This number must be multiplied by a known service factor K from the data below to obtain the correct torque requirement for the clutch. Service Factor K The power pulses of a gasoline or diesel engine result in momentary torque output which is several times higher than the engine s rated torque. Many electric motors can also deliver up to three times their rated output for a short period. clutch coupled to these power systems must be able to transmit the required torque for these short periods without slipping. Using the chart at right, estimate the K service factor which is appropriate for your application. Torque etermination hart 5,000 0,000 8,000 6,000 4,000 3,000 2,000,500, ,000,500 2,000 3,000 0,000 Speed R.P.M. Torque Lb. Ft. Horsepower Type of pplication Horsepower / Nomograph onveyor and augers where a static load must be started by the dynamic torque of the clutch. Hydralic pumps where the clutch may have to work against pressure at time of engagement Gasoline or diesel engines where the clutch should be able to stall the engine. /3 /2 3/ K Range K = 3 to 5 K = 2.5 to 5 K = 2 to 5 ir compressors K = 2 to 4 lectric motors where the clutch should be able to stall the motor. Use the overload factor from the motor catalog or use. Light machines where the load is applied after the clutch is engaged. (e.g. a lathe) K = 2 to 3 K =.5 to P-09-W 3/8

5 ngine, Pump and ompressor lutches- Selection xample 0 horsepower pump driven by an electric motor operates at 500 RPM. Using 3 as the value of the K factor, determine the required clutch torque capacity. 0 HP at 500 RPM = 35 lb.ft. torque K factor 3 x 40 lb.ft. = 05 lb.ft. torque. This application will require a clutch with a static torque rating of 05 lb.ft. Static torque can also be calculated by using the following formula: T = xample 5250 x HP x K RPM truck mounted hydraulic pump requires 8 horsepower to operate at 2000 RPM. What is the required clutch torque rating? Fluid Power Formula T= HP x 5250 x K T= IR x PSI 75.4 Where: RPM T = Torque (Ib. ft.) HP = Horsepower RPM = Speed of lutch (revolutions per minute) IR = ubic inch per revolution (hydralic pump) PSI = Pounds per square inch K = Service factor (see chart on page 3) If HP is unknown: HP = GPM x PSI x Pump efficiency Where: GPM = Fluid flow in gallons per minute PSI = Pressure in pounds per square inch Pump efficiency = normally 85% Rule of Thumb: HP per 500psi.7 HP per 000psi If PSI is unknown: cubic inch per revolution equals 6 lb.in. of torque per 00 psi. gallon equals 23 cubic inches. Using a service factor of 5: T = 5250 x 8 x T = 05 lb.ft. clutch with a static torque capacity of 05 lb.ft. is required for this application. Percent Static Torque TYPIL YNMI TORQU ynamic Torque as Percent of Static Torque FPM = RPM x x iameter (of clutch) 20,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 Surface Speed (Ft. Per Min. at O..) P-09-W 3/8 4

6 ngine, Pump and ompressor lutches- Selection Shafts Warner lectric standard clutches are available to adapt to three different shaft configurations: Straight bore - for through shaft or end of shaft mounting. Tapered bore (8:) - shaft tapers /2 inches per foot, for end of shaft mounting. Tapered bore (4:) - shaft tapers three inches per foot, for end of shaft mounting. Types of rives Warner lectric offers clutches which are compatible with the three basic types of drives. irect rive In direct drive arrangements, a drive shaft with a universal joint or other flexible coupling is attached to the engine crankshaft or transmission PTO on one end and the pump or compressor on the other. The clutch usually mounts on the pump or compressor. The yoke drive clutches in this section are equipped with flanges designed to bolt directly to a universal joint assembly. rive shaft alignment must be within 3. Parallel Shaft In parallel shaft applications, torque is transmitted from a drive or line shaft to the pump, compressor or other accessory which is mounted parallel to it. The straight bore clutches with bearing mounted fields are often used in this drive arrangement. elt or chain drives are most frequently used in parallel shaft applications. elt rive The most common method of driving mobile accessories is through automotive or industrial belts. The driven accessory is parallel to and driven by a pulley mounted on the engine crankshaft. The relative diameters of the drive and driven pulleys, speed range of the engine, and required pump or compressor performance are all factors to be considered when selecting a belt driven clutch. Warner lectric clutches have grooved pulleys, which permit the use of either an or V-belt. 5 P-09-W 3/8

7 ngine, Pump and ompressor lutches- Selection lectrical lectrical Ratings ll current and resistance ratings are taken at ambient temperatures of 70 F (20 ). Voltage Requirements Warner lectric clutches are normally furnished with 2 V coils. lutches can be designed to accommodate other voltages. urrent raw urrent draw for each clutch model is listed in the product specifications section of this section. Resistance/Heat issipation lectrical resistance increases with coil temperature. Since the increase in electrical resistance reduces coil current, the torque transmitted by the clutch will be reduced. In applications where heat dissipation from the clutch is not adequate, air from an external source should be forced over the clutch to ensure proper operation. Most Warner lectric clutches shown in this section have been designed to operate in typical under hood temperatures. lutch Mounting Warner lectric clutches are offered with flange or bearing mounts. Select the type best suited for your application based on the information below. earing Mounted lutches earing mounted clutches are preassembled into a complete operating unit which is mounted directly to the shaft. In this design, the field is mounted on its own bearing as an internal part of the clutch and has an antirotation tang to prevent it from turning in operation. This antirotation tang is to be pinned LOOSLY to a member or held with a torque arm. Flange Mounted lutches In a flange mount clutch application, the field is bolted directly to a fixed member on either the output (engine crankcase or electric motor) or the driven accessory (input). Mounting brackets and fixtures for a specific application must be designed in accordance with the clutch dimensions found in the specifications section to ensure proper perpendicularity and concentricity. lutch Location Wherever possible, the clutch should be located on the higher speed shaft. lutch Rotation irection of drive can be a significant design consideration in applications with a peak load during clutch engagement. Warner lectric clutches incorporate leaf springs in the armature to transmit the load. When peak loads at start-up are possible, springs should be oriented so that they are placed in tension (stretch). lutch rotation can be determined by observing the leaf spring direction on the armature. P-09-W 3/8 6

8 ngine, Pump and ompressor lutches- imensions Tapered ore lutches (Flange Mount, Single Row earing) 3 4 Y Y Field (ommon) 4x ia. Holes Notes: ll dimensions are inches. ll units 2V unless otherwise indicated lutch Groove Size Type Y Gage Line urrent raw mps Resistance Ohms Static Torque Ib ft Rotation º W º W º W 4-72 old current draw 2 24V Model No. 7 P-09-W 3/8

9 ngine, Pump and ompressor lutches- imensions Tapered ore lutches (Flange or Yoke irect rive, ouble Row earing) Fields 4x ia. Holes F Notes: ll dimensions are inches. ll units 2V unless otherwise indicated rive shaft alignment must be within 3 maximum. (lutch centerline must be within 3 of power source centerline) lutch Type Field Groove Size Type Y Gage Line urrent raw mps Resistance Ohms Static Torque Ib ft. Rotation 6.4 F W 45- old current draw Model No. P-09-W 3/8 8

10 ngine, Pump and ompressor lutches- imensions Tapered ore lutches (Flange Mount, Single Row earing) 2 4 Y Y 9 P-09-W 3/8

11 ngine, Pump and ompressor lutches- imensions Tapered ore lutches (Flange Mount, ouble Row earing) Fields F 4x ia. Holes Notes: ll dimensions are inches. ll units 2V unless otherwise indicated lutch Type Field Groove Size Type Y Gage Line urrent raw mps Resistance Ohms Static Torque Ib ft Rotation Model No F º W F º W F º W F º W F º W F º W F º W F º W F º W old current draw 2 24V 3 Special terminal P-09-W 3/8 0

12 ngine, Pump and ompressor lutches- imensions Tapered ore lutches (Flange Mount, ouble Row earing) 2 4 Same Field as page 2 Notes: ll dimensions are inches. ll units 2V unless otherwise indicated lutch Groove Size Type Y Gage Line urrent raw mps Resistance Ohms Static Torque Ib ft Rotation Model No º W º W º W º W º W old current draw 2 24V P-09-W 3/8

13 ngine, Pump and ompressor lutches- imensions Tapered ore lutches (Flange Mount, ouble Row earing) 2 Fields (ommon) ia. Holes Notes: ll dimensions are inches. ll units 2V unless otherwise indicated lutch Groove Size Type Y Gage Line urrent raw mps Resistance Ohms Static Torque Ib ft Rotation Model No º W old current draw 2 24V P-09-W 3/8 2

14 ngine, Pump and ompressor lutches- imensions Tapered ore lutches (Flange Mount, ouble Row earing) 2 Same Field as page 2 Notes: ll dimensions are inches. ll units 2V unless otherwise indicated lutch Type Number of Groove Size Grooves Y Gage Line urrent raw mps Resistance Ohms Static Torque Ib ft Rotation Model No º W , º W º W º W 4-70 old current draw 2 24V 3 Special terminal 3 P-09-W 3/8

15 Tapered ore lutches (Flange Mount, ouble Row earing) ngine, Pump and ompressor lutches- imensions 3 4 Same Field as page 2 5 Field ( only) 3.25 Notes: ll dimensions are inches. ll units 2V unless otherwise indicated 4.00 lutch Type Number of Groove Size Grooves Y Gage Line urrent raw mps Resistance Ohms Static Torque Ib ft Rotation Model No º W º W º W º W old current draw 2 24V 4 / groove P-09-W 3/8 4

16 ngine, Pump and ompressor lutches- imensions Tapered ore lutches (Special onstruction, Flange Mount, ouble Row earing) 2 3 Y Y 6 Fields (ommon) 4x ia. Holes Notes: lutches on this page are specially constructed to withstand more severe operating environments. ll dimensions are inches. ll units 2V unless otherwise indicated lutch Type Number of Grooves Y Groove Size Gage Line urrent raw mps Resistance Ohms Static Torque Ib ft Rotation Model No º W º W º W º W º W º W º W 47-2 old current draw 2 8: Taper 4 / groove 2 24V 5 P-09-W 3/8

17 ngine, Pump and ompressor lutches- imensions Straight ore lutches (earing Mount) 2 rmatures 2 Fields (ommon) Notes: ll dimensions are inches. ll units 2V unless otherwise indicated Typical antirotation tang to be pinned loosely to a member to prevent field rotation. o not bolt rigidly. ore Size lutch Type rmature Type Static Torque Ib ft urrent raw mps Resistance Ohms Rotation Keyway Model No. 3/ W W old current draw 2 90 Volts P-09-W 3/8 6

18 ngine, Pump and ompressor lutches- imensions Straight ore lutches (earing Mount) P-09-W 3/8

19 Straight ore lutches (earing Mount) ngine, Pump and ompressor lutches- imensions F.895 F Notes: ll dimensions are inches. ll units 2V unless otherwise indicated ore Size lutch Type rmature Type Field Type elt elt Y Static Torque Ib ft urrent raw mps Resistance Ohms Rotation Keyway Part No. 3/4 F W /4 2 2 F W F W F º W F º W F W old current draw P-09-W 3/8 8

20 ngine, Pump and ompressor lutches- imensions Straight ore lutches (Special onstruction, Flange Mount) (The clutches on this page include mounting hub) Y Y 9 P-09-W 3/8

21 ngine, Pump and ompressor lutches- imensions Mounting Hubs F 4x 90 F ø x 5/6-24 UNF x 3/8-6 UNF-2 F3 2x M0.5-6H Notes: ø4.73 ll dimensions are inches. ll units 2V unless otherwise indicated ø2.300 ø.60 ø5.000 F3 Mounting hub fits mount pumps ore Size lutch Type Mounting Hub Type Y Static Torque Ib ft urrent raw mps Resistance Ohms Rotation Keyway Model No. /2 2 F º W /2 3 F º W F º W F º W F º W F º W F º W P-09-W 3/8 20

22 ngine, Pump and ompressor lutches- imensions Straight ore lutches (Special onstructions) 2 3 Y Y P-09-W 3/8

23 ngine, Pump and ompressor lutches- imensions Fields F F2 F3 4x ia. Holes Ø.437" Ø fl NOM F4 F5 6 x /2 3 /4" R.26" 2x 80.97" 4x 3/8-24 UNF-2 Notes: ll dimensions are inches. ll units 2V unless otherwise indicated ore Size lutch Type Field Type rive oupling elt elt Y Static Torque Ib ft. urrent raw mps Resistance Ohms Rotation Keyway Model No. 9/6 F º W /4 2 F º W /4 2 F º W F W Sp 5 F W F W F º W old current draw 2 24V 3 For Gresen pump only 4 3 tooth spline hub clutches must be installed on pumps with internal involute flat root side fit splines per NSI-92.. Major diameter.90 max. P-09-W 3/8 22

24 ngine, Pump and ompressor lutches- imensions Straight ore lutches (Shaft Mount) Y Y Y 6 7 Y 23 P-09-W 3/8

25 Straight ore lutches (Shaft Mount) ngine, Pump and ompressor lutches- imensions Fields F F2.564/.562 ia ia. Hole R Typical antirotation tang to be loosely pinned to a member to prevent rotation. o not bolt rigidly M ia... 4x 3/8-6 UN-2 Notes: ll dimensions are inches. ll units 2V unless otherwise indicated ore Size lutch Type Field Type elt elt Y Resistance Ohms Rotation Keyway Model No. 9/6 2 F W /6 F W /6 F W /6 7 F W F W / 8 3 F W / 8 6 F W old current draw 2 racket mounting 3 24 Volt For all models shown: Nom..8, F Max..70, G Max..20, H Max..47. Static Torque Ib ft. urrent raw mps P-09-W 3/8 24

26 Glossary cceleration Time, ngagement Time The time required to change the speed of a system from the moment the clutch receives the appropriate electrical signal until the clutch is fully engaged and the system is moving at its maximum speed. earing Mount clutch which is preassembled into a complete operating unit and is mounted directly to the shaft. rushholder clutch component which carries electrical current from the lead wires to the rotating magnet. uild Up Time The time in seconds required to build up to 90% of rated flux which corresponds to 80% rated torque. urnishing The process of cycling or wearing in of clutch or brake friction surfaces. This process ensures rated torque during initial cycles, and decreases the cycles required from installation to full rated torque output. ecay Time The time in seconds required to decay to 0% of rated flux which corresponds to % of rated torque on de-energization of the unit. eceleration Time, ngagement Time The time required to stop a system from the moment the brake receives the appropriate electrical signal until the brake is statically engaged and the system is at rest. Field component part of Warner lectric clutches consisting of a steel shell and a coil. lso referred to as a magnet. Flange Mount clutch which has the field bolted directly to a fixed member on the machine. Flux Magnetic attraction caused by an electrical current. Gap The distance between armature and rotor faces in clutches when the unit is in an inactive state (i.e. disengaged). Integral Key key shaped directly into the bore of a clutch. This is sometimes used in place of a standard keyway and key. K Factor See service factor. Poles. Refers to magnet poles: North/South poles. 2. The edges of a Warner lectric magnet or field shell through which the magnetic flux flows. Pulley sheave that turns or is turned by a belt so as to transmit torque, rotation. Residual Magnetism The condition in magnets where low level magnetism remains after the electric current is removed. Rotor The input member of a clutch/brake. Service Factor figure by which torque is multiplied to ensure performance of the clutch under the worst case application conditions. Tapered ore (Shaft) Many hydraulic pumps incorporate a taper on the output shaft, providing stronger clutch-to-shaft engagement than on straight shafts. Tapered shafts are most commonly in 4: and 8: taper ratios. 4: Taper: The shaft changes in diameter by one inch for each four inches of length. 8: Taper: The shaft changes in diameter by one inch for each eight inches of length. Torque Static: The torque which is developed when there is no relative motion or slippage between the mating friction surfaces. clutch which is fully engaged and driving exhibits static torque. ll standard units are rated on the basis of static torque after burnishing. ynamic: The torque developed when there is relative motion between the mating friction surface. The torque varies inversely with the amount of slip, so specific values must be taken from engineering data P-09-W 3/8

27 Technical onsiderations lutch Location Wherever possible, the clutch should be located on the higher speed shaft. lutch Rotation irection of drive can be a significant design consideration in applications with a peak load during clutch engagement. Warner lectric clutches incorporate leaf springs in the armature to transmit the load. Where peak loads at start-up are possible, springs should be oriented so that they are placed in tension (or stretch). Spring rotation can be determined by observing the leaf spring direction on the armature. lectrical Ratings ll current and resistance ratings are taken at ambient temperatures of 70ºF (20º). Fluid Power Formula If you are sizing a clutch for a pump application, but do not know the HP required, the following formula will allow you to work back to the torque formula. If HP is unknown: HP = GPM x PSI x Pump fficiency Where: GPM = Fluid flow in gallons per minute PSI = Pressure in pounds per square inch Pump efficiency = normally 85% Rule of Thumb: HP per 500psi.7 HP per 000psi If PSI is unknown: cubic inch per revolution equals 6 lb.in. of torque per 00 psi. gallon equals 23 cubic inches. If GPM is unknown: GPM = RPM x ISP (IN 3 ) 23 Static Torque The torque requirements for your particular application may be determined by using the following relationship: Voltage Requirements Most clutches and clutch/brakes require 2 V to operate at their maximum torque rating. Less than 2 V may cause clutch slippage and premature failure. bbreviations: T = Torque (Ib. ft.) HP = Horsepower RPM = Speed of lutch (revolutions per minute) IR = ubic inch per revolution PSI = Pounds per square inch K = Service factor T = 520 x HP RPM T= IR x PSI 75.4 P-09-W 3/8 26

28 Part Number Index Warner Page Pitts Ogura (M-6) (M-6R) (M-7) Warner Page Pitts Ogura (M-57/8M) Warner Page Pitts Ogura P-09-W 3/8

29 Notes P-09-W 3/8 28

30 Mobile Power pplication ata Form For pplication ssistance, Phone or Fax ate ompany Name ddress ity Type of pplication Shaft iameter (give limits) Straight Taper Maximum Torque at lutch Lb. Ft. HP at RPM s GPM at PSI lectrical System Regulated Unregulated lutch uty ycle (Time On/Off)/Hr nvironment Temp Range F Location Quantity nnual Power Source (give HP and Mfg) Gas iesel lectric Other riven Load (give parameters) ir ompressor Pump Mower eck 29 P-09-W 3/8

31 The Power Of One, The Strength Of Many. OTHR PROUT SOLUTIONS FROM LTR INUSTRIL MOTION Our comprehensive product offerings include various types of clutches and brakes, overrunning clutches, engineered bearing assemblies, gearing and gear motors along with linear products, belted drives, couplings and limit switches. With thousands of product solutions available, ltra provides true single source convenience while meeting specific customer requirements. Many major OMs and end users prefer ltra products as their No. choice for performance and reliability. LTRI LUTHS N RKS Inertia ynamics Matrix Stromag Warner lectric HVY UTY LUTHS N RKS Industrial lutch Stromag Svendborg rakes Twifl ex Wichita lutch OVRRUNNING LUTHS Formsprag lutch Marland lutch Stieber NGINR OUPLINGS N UNIVRSL JOINTS meridrives ibby Turbofl ex Guardian ouplings Huco Lamifl ex ouplings Stromag T Wood s GR RIVS auer Gear Motor oston Gear elroyd Worm Gear Nuttall Gear GR MOTORS auer Gear Motor POWR TRNSMISSION OMPONNTS LINR TUTORS N ONTROLS Warner Linear NGINR RING SSMLIS Kilian IR MOTORS Huco LT RIVS N SHVS T Wood s GR M LIMIT SWITHS Stromag

32 ltra Industrial Motion Warner lectric Facilities North merica 3 Industrial Park Road New Hartford, T US lectromagnetic lutches and rakes 449 Gardner Street South eloit, IL US ast Park 30 rive olumbia ity, IN US Precision lectric oils and lectromagnetic lutches and rakes ustomer Service pplication Support urope 7, rue hampfl eur,.p St arthelemy d njou - France +33 (0) lectromagnetic lutches and rakes ustomer Service +33 (0) pplication Support +33 (0) sia Pacific ustralia hina Hong Kong Singapore Taiwan Thailand The rands of ltra Industrial Motion ouplings meridrives ibby Turboflex ex.com Guardian ouplings Huco Lamiflex ouplings excouplings.com Stromag T Wood s Geared am Limit Switches Stromag lectric lutches & rakes Inertia ynamics Matrix Stromag Warner lectric Linear Products Warner Linear ngineered earing ssemblies Kilian Heavy uty lutches & rakes Industrial lutch Twiflex ex.com Stromag Svendborg rakes Wichita lutch elted rives T Wood s Gearing auer Gear Motor oston Gear elroyd Worm Gear Nuttall Gear Overrunning lutches Formsprag lutch Marland lutch Stieber Neither the accuracy nor completeness of the information contained in this publication is guaranteed by the company and may be subject to change in its sole discretion. The operating and performance characteristics of these products may vary depending on the application, installation, operating conditions and environmental factors. The company s terms and conditions of sale can be viewed at These terms and conditions apply to any person who may buy, acquire or use a product referred to herein, including any person who buys from a licensed distributor of these branded products. 208 by Warner lectric LL. ll rights reserved. ll trademarks in this publication are the sole and exclusive property of Warner lectric LL or one of its affi liated companies. P-09-W 3/8