OPTI torque. Cost effective overload protection. Ball/detent torque limiter

Transcription

1 Cost effective overload protection Ball/detent torque limiter Accurate, reliable torque control Wide torque range Unique system for settg torque K..V.GB

2 Why use a torque limiter? The concept: A torque limiter is a mechanical device that disengages when the transmitted torque exceeds a pre-set value, i.e. when an overload occurs. People, products, drives, equipment and maches can be protected agast the damage caused by overloads, and the costly repairs and unnecessary downtime which can result. The practical solution: Many years of experience developg, improvg and manufacturg torque limitg clutches enable us to now offer the ideal mechanical torque limiter for virtually every application. The latest production techniques and quality control systems guarantee consistently high quality products that are economically priced. Compared to an overcurrent relay, or other electrical overload devices a torque limiter not only provides a signal the event of an overload, but stantaneously disengages, isolatg the ertia energy of the drive system. creases productivity by elimatg expensive mache downtime. Why use? Only offers all the followg advantages * assures precise torque contol. Even extreme conditions, repetitive accuracies of +/-5% are achieved. * The system of differg sprg weights and configurations results wide torque ranges for all size units. Low torque applications with large shaft diameters are possible. * s small size yields low mass moments of ertia. * offers a unique system for settg the overload torque, makg adjustment both easy and accurate. * features a positive lockg arrangement, preventg torque settg changes durg operation. * s large diameter limit switch plate allows the use of coercially available, expensive limit switch (see page ). Promixity sensors can be used without limit switch plate stalled. Basic function of : is a ball/roller detent torque limitg clutch, transmittg torque via balls and detents (multiple position reset) or rollers are held their respective detents through the pressure generated by disc sprgs. When an overload occurs, exceedg the pre-set torque, the balls or rollers ride out of their detents, disengagg the clutch. The balls or rollers ridg out of their detents produce the axial stroke of the limit switch plate, which is used to actuate a mechanical limit switch to shut down the drive. Alternatively, the can be used without a limit switch plate and a proximity switch sensg the axial movement of the control element. The limitg torque for an overload is set by adjustg the sprg pressure on the balls or rollers. This is done by means of an adjustg nut, which is positively locked once the torque has been set. As utilizes rollg disengagement, torque changes due to frictional wear, as friction torque limiters, are elimated. Consistent and repeatable torque settgs, unaffected by outside fluences such as temperature, humidity or lubrication are the result. Engeerg Assistance Please let us know what your specific requirements are und we will be happy to work out, without any obligation, a detailed recoendation. Sce our engeers cannot be aware of all applications and control all factors that may affect the function of our products, our warranty applies only to products manufactured by Mayr. In accordance with our established policy to constantly improve our products, the specifiations contaed here are subject to change without notice. Options and special designs: Double C face or IEC-flange torque limiter. For stallation between motor and gear box. Design for small drive elements. Covered and sealed units for dusty environments or severe conditions, such as high pressure wash down. Optional fishes standard fish is zc phosphatg. Alternative fishes, such as nickel platg, etc., are available upon request.

3 are available two basic s: multiple position clutch - for iediate re-engagement The balls the multiple position clutch ratchet from one set of detents to the next durg an overload. The multiple position therefore iediately and automatically re-engages, as soon as the overload has been cleared. Residual torque transmitted durg an overload is substantially lower than the pre-set torque. sgle position clutch - for timg and sequencg By utilizg unequally spaced rollers, the sgle position clutch automatically re-engages after one full revolution, once the overload has been cleared. As re-engagement is at the exact position of disengagement, timg and/or sequencg with the mache is mataed. Residual torque transmitted disengaged position is substantially lower than the pre-set torque. Components: standard hub extended hub output flange multiple position output flange sgle position 5 control element multiple position control element sgle position 7a ball cage 7b roller 8 axial bearg 9 sprg adjustg nut lock washer lockg screw limit switch plate

4 Selection Procedure: s adaptability makes selection easy. Two basic parameters to be considered: * Torque: It is essential to determe the torque at the pot where will be mounted. The torque should be based on allowable torque for the drive components. Alternatively torque can be calculated from the motor horse and operatg speed. Remember to consider peak torques due to start-up or other operatg conditions that should not lead to disengagement of clutch. * Shaft diameter: The overlaps torque ranges from one size OPTI torque to the next allow different size units to be utilized for the same torque requirement. The determg factor then becomes shaft diameter. Location of : The most effective location for is as close as possible to the potential trouble spot or the drive component which must be protected. Keep md the more ertia that is disengaged, results less engery that can cause damage. The figures below show the recoended locations for two typical drive arrangements. Alternate locations A, B and C provide less effective protection, especially when large speed reductions occur beyond the.

5 Overload protection for virtually every application Narrow drive elements such as this A-plate sprocket are easily mounted on the standard hub of the, makg both a compact and economic package. Combed with a flexible couplg, the connects drive and driven shafts, accomodatg angular, axial and radial shaft misalignments, while also providg overload protection. The extented hub and tegral bushg of the makes it ideally suited for wider drive elements, such as this pulley. With the stalled with the pulley ward, overhung load on the drive shaft is mimized, and easy access is provided for torque adjustments. Designs for small drive elements. For use with sprockets, gears, pulleys, etc. with small pitch diameters. 5

6 Type.. with standard hub multiple /sgle position clutch Type.. with extended hub *Counterbore a /Ød only with size All other dimensions same as... Please notice that all threads for set screws as shown above are provided only when ordered fish bored. Technical data and Dimensions size dim... multiple position clutch.5... torque ranges sgle position clutch max. speed rpm lbf x Nm lbf x Nm lbf x Nm lbf x Nm lbf x Nm stroke of output flange and limit switch plate t size dim. multiple sgle position position clutch clutch.7,.79,.9,.,.,.7,.59,5.75,9.87,.87, a a a b.5,5.9,5.9, c.85,7.8,5.75 7,., c.8,.88,.8 7,5.7,7.5,9 d m d max d m d max d. 5

7 multiple /sgle position clutch Type.. with tegral bushg Type.. combed with flexible couplg Technical Data and Dimensions size dim. E h8 ) e h7 All other dimensions same as... Please notice that as shown above all threads for set screws are provided only when ordered fish bored. e ) F h8 F F f f H h k ,5.9 8,5.5 5,5 5.7, ),5 ).5 ), ).8. 5,5. 5,5 size dim. L L L 8 L 9 I I I I I m s u SW Z , ,5.7,5.89, x- xm5 x- xm5 x/- xm x/- xm x5/-8 xm ) ).8 ) ) Order example: To be cluded when orderg, please state: Order No: standard with flexible couplg.. * low torque range * middle torque range * high torque range * max. torque range ) * metric threads s * ch size threads s size Type.. bore Ø d H7 bore Ø d H7 Examples: /../ / /.55. / /5 For limit switch details please refer to page. accordg to clutch size accordg to clutch size standard hub extended hub with tegral bushg multiple position clutch 5 sgle position clutch * See technical data, torque ranges ) please see page 8 for machg of drive elements ) hexagon socket bolt DIN 799 ) not with sgle position clutch In accordance with our established policy to constantly improve our products, the specifications contaed here are subject to change without notice. 7

8 Installation Mountg drive elements: The drive element (sprocket, pulley, gear, etc.) is bolted to the output flange of the before stallg on the shaft. The support required for the drive element is dependent upon which hub configuration is selected, and the drive element itself. Standard hub (page ): A narrow drive element, i. e.: an A-plate sprocket, is bolted to the output flange and supported directly on the hub. This arrangement is not recoended for applications with high radial loads or frequent overloads. Extended hub (page 5): For wider drive elements, the drive elemnt is bolted to the output flange. Support of the drive element is either by a customer provided bearg or bushg, or one that is tegral to the, as the models.. and..5. It is essential to ensure that no axial forces are applied to the output flange by the drive element, i. e. by misaligned belts or chas, or improper stallation of the drive element. Machg of drive elements (surface fish given µm;. µm = µin /. µm = µin) Data for machg drive elements for x = Ø e F7 size T W X Y ,5,5,5,8, ,5,5,5,8, ,,,,5, ,5,5,5,, Sgle plate (A-plate) sprockets for size of torque limiter smallest possible number of teeth pitch RC # /8 / 5/8 / / sprockets width , 7, 8,7,, 7,5 Installation on shaft All hubs are bored and keyed through, and once stalled on the shaft are typically held axially by means of a set screw, as shown the figure below. Preferably should be held on the shaft by means of a clamp plate, as shown the figure below. 8

9 Disc sprg layer configuration Only the correct disc sprg configuration guarantees that the torques mentioned the catalogue can be achieved and that the torque can be adjusted without problems. The disc sprg configuration is different and depends on the size and of clutch. 5x sgle 5x double x sgle x double x triple layer layer layer layer layer Size : Size : Type.5. x helical layer Type.. x sgle layer Type.5. 5x sgle layer Type.5. x sgle layer Type.. 5x double layer Type.. x sgle layer Type.7. x triple layer Type.7. x double layer Torque adjustment The disengagg torque is set by turng the adjustg nut. Clockwise rotation of the adjustg nut (when viewed as shown) creases the torque settg, and counter-clockwise rotation decreases the torque settg. lock washer adjustg nut lockg screw creasg torque corresponds to one graduation one rotation corresponds to graduations sizes - or graduations with size Initial torque settg Prior to itially settg the disengagg torque, check that the thread on the adjustg nut and hub, and contact surfaces of the adjustg nut and lockwasher have been greased. Then proceed as follows: * Manually tighten the adjustg nut until it contacts the discs sprgs * Contue turng until the notches lock washer are le. * Usg a face wrench, tighten the adjustg nut the required number of graduations correspondg to the desired torque settg, as shown the settg diagrams. * When the notches the adjustg nut and lock washer are aga le, the lockg screw can the be stalled. Settg example A size,.. is to be set at 5 lbs-. From the settg diagram (cluded with every clutch) the required number of graduations is 5. Followg the above structions, the adjustg nut is tightend 5 graduations. size wrench Type 9 wrench a =.8 [] wrench wrench

10 size set screw metric Recoended set screw sizes and position of plate wheel sprocket dimension a dimension c dimension e DU disc ch ch ch ch M ,5.5,5.59 M,5.77 7, ,5.59 M,5.77 7, ,5.59 M M Recoended set screw sizes and position (ANSI) size set screw dimension a dimension c dimension e DU disc ch ch ch ch - UNF,8,.8,.,5.59 /- UNC ,.87 8,8.,5.59 5/-8 UNC.5.77, ,5.59 5/-8 UNC /8- UNC. 9,.,..79 Standard keyways used DIN 885 () ANSI (.) bore keyway x,8 8 x, x, x, x,8 x, bore 5/8 7/8 5/ / 5/ /8 7/ / / / /8 keyway / x / / x /8 5/ x 5/ /8 x / / x / / x / Tolerance chart for fish bore dim. shaft diameter bore H

11 Limit switch Type (mechanical operation) Application Monitorg of mechanical movements and fal positions. Control switch for electronic and mechanical sequences. Measurg of axial disengagg movements, for example connection with EAS -clutches. Function The pre positioned contact is unloaded by actuatg the control lever: Open contacts - (-), close - (-). Design The micro switch fitted to an alumium die cast housg is actuated by a control lever. Operation is only possible one direction. The limit switch is fastened with M cap screws via two screw-on brackets attached diagonally. Technical data Contact change-over contact (special design: change-over contacts) Switchg capacity 5 VAC / 5 A (with contacts: A) VDC / A VDC /,5 A 5 VDC /, A m. VDC/ ma Contact material AgCdO 9/ Switchg frequency max. switchg operations/m Ambient temperature - C up to +85 C Protection IP 5 Weight 75 g Switch travel settg By the adjustg screw (SW 7) arranged laterally the zero shift is possible to right or left by max. 5 Switch travel Pre-travel m.,5 to,5 Over-travel: max., dependg on the zero shift Special s On request different control lever lengths as well as a design with change-over contacts are possible Dimensions () Electrical connection To be cluded when orderg, please state: Order number: Type

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