192 clutches and power-stop control – Stop mechanism – Limit stop
Patent
1987-11-09
1988-12-27
Herrmann, Allan D.
192 clutches and power-stop control
Stop mechanism
Limit stop
74 8915, 74335, 74473R, 192143, 200 47, 318468, 318475, F16H 2524, G05G 300, F16D 7104
Patent
active
047934581
ABSTRACT:
An improved shift motor assembly for selectively moving a shift rod or similar member between two gear-engaging positions for use, for example, in a two-speed axle assembly is disclosed. The assembly includes a mechanism for limiting the amount of linear movement of a drive nut of a gear changing apparatus. The movement limiting mechanism interrupts an electrical circuit between a source of electrical energy and a bi-directional motor utilized to move the drive nut, thereby preventing linear movement of the drive nut beyond predetermined limit positions in either directions. The movement limiting mechanism includes a movable electrical contact which normally engages a stationary electrical contact. The movable and stationary electrical contacts form a single pole, single throw electrical switch which is connected in series between the source of electrical energy and the motor. When the dirve nut is moved in a first linear direction to a predetermined limit position, it engages the movable electrical contact and moves such contact out of engagement with the stationary electrical contact. As a result, the motor is disabled from further moving the drive nut from being further moved in the first direction. A second movable electrical contact and a second stationary electrical contact are provided to limit the linear movement of the drive nut in a second linear direction, opposite to the first direction.
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Dana Corporation
Herrmann Allan D.
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