Electro-mechanical actuator
First Claim
1. An actuator for a window lift mechanism, said actuator comprising:
- an output shaft for driving said mechanism;
an output gear coupled to said output shaft;
a plurality of motors coupled to said output gear for simultaneously driving said output gear and said output shaft, wherein said plurality of motors comprises a first motor having a first torque ripple characteristic and a second motor having a second torque ripple characteristic, wherein said first torque ripple characteristic is at least partially out of phase with said second torque ripple characteristic to reduce vibration imparted to said actuator by said plurality of motors.
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Accused Products
Abstract
An electro-mechanical actuator including a plurality of motors for driving an output shaft. The actuator may be incorporated into a window lift mechanism, such as a mechanism including a dual rack and pinion assembly. According to another aspect of the invention there is provided a variety of anti-back-drive mechanisms, e.g. clutches. A clutch according to one embodiment includes locking pawls that resist back-drive. In another embodiment, locking cams rotate relative to a carrier to resist back-drive. An actuator consistent with the invention may incorporate an impact mechanism including a flexible carrier. The carrier flexes to prevent impact forces at an output gear train from coupling to an input gear train.
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Citations
6 Claims
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1. An actuator for a window lift mechanism, said actuator comprising:
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an output shaft for driving said mechanism;
an output gear coupled to said output shaft;
a plurality of motors coupled to said output gear for simultaneously driving said output gear and said output shaft, wherein said plurality of motors comprises a first motor having a first torque ripple characteristic and a second motor having a second torque ripple characteristic, wherein said first torque ripple characteristic is at least partially out of phase with said second torque ripple characteristic to reduce vibration imparted to said actuator by said plurality of motors. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification