Cushion couplings

Structure of cushion couplings

Introduction

Cushion couplings absorb eccentricity, declination, and rotational vibration through the deformation of cylindrical cushions which surround hub projections. The six cushions are fully independent, so each can deform in the most effective manner, easily handling issues of misalignment or rotational vibration.

There are four types of cushion material. The defferences in hardness leaves between them are reflected in their torsion properties eccentricity properties.

Selection precautions

・Please select cushion of soft (or torsion spring constant is small) for rotational load such as Pumps that torque vibration occurs.

Prioritizing normal torque and selecting a hard cushion can cause the bases of the hub's projectiong elements to be damaged first due to metal fatigue.

・For servo or cam drive loads, etc., with large inertial masses, select soft cushions for the same reason, as well as sufficiently large torques.

・Use a normal torque of 1/2 of the rated torque for constant operation at the maximum rpm.

・Apply grease to cushion connection sides in the event of large amounts of eccentricity, declination, expansion/contraction,etc.

Q image
 
Q image2 

Ambient temperature and normal torque correction

QJ/QJU

Adjust the normal torque based on the ambient temperature (see table below).

Ambient

temperature

  Temperature correction factor
Cushion UB,UY,UR Cushion   NK       
 -20~20℃ 1.2 1.2
 20~45℃  1.0  1.0
 45~60℃  0.8  0.8
 60~80℃ -

 0.7

・Cushion UB,UY, and UR can be used in operationg environments with temperatures of up to 60℃.

・Cushion NK can be used in operating environments with temperature of up to 80℃.

QRU

Adjust the normal torque based on the ambient temperature (see table below).

Ambient

temperature

  Temperature correction factor
Cushion S
Cushion   H
 -20~20℃ 1.2 1.2
 20~45℃ 1.0  1.0
 45~60℃ 0.8  0.8
 60~80℃ 0.5

 0.5

・If you have high speed rotation, eccentricity and deflection angle, apply high viscosity grease regularly to the contact surface of cushion and hub.
・If the cushion wears, please replace it.

・If the wear of the cushion is severe, please choose it big  size one of the coupling.

Cushion couplings product list

Click on the picture to jump to product description.

qj 01

QJ

Outer diameter 45-95
Shaft diameter 12-40
Features

・Die-cast aluminum hubs and the combination of soft(urethane) and hard(nylon) materials for cushion.
・Set screw style.

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qju 01

QJU

Outer diameter 45-95
Shaft diameter 12-40
Features

Die-cast aluminum hubs and the combination of soft(urethane) and hard(nylon) materials for cushion.
・Clamp style.

Learn more

qru 01

QRU

Outer diameter 16-40
Shaft diameter 4-18
Features

・Excellent vibration absorption with two kinds of rubber cushions with different hardness.
・Clamp style.

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