|Rotary Actuators
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What is the backlash of the rotary actuator (rack pinion type)?
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Generally, this term indicates the clearance between teeth in the gear.
In the case of rotary actuators, the play in the direction of rotation of the output shaft at the rotation end is called backlash.
With CRA1 series single rack & pinion type rotary actuators, backlash occurs on the output shaft at the rotation end.
Mount an external stopper if necessary.
However, for CRQ and MSQ series double piston type rotary actuators, there is no backlash on the output shaft.
movie(Backlash) movie(Backlash Single) movie(Backlash Double)
This is because when one of the pistons hits the stopper, there is more space for the other piston to move, and so the force of one piston is applied to the pinion gear, absorbing the backlash.
Keep in mind that the holding torque at the rotation end is half the effective torque.
(CRJ series mini rotary actuators have a construction in which backlash does not occur at the rotation end even with the single rack type.)See the video below for details.
