Electrically actuated two-speed drive

Mabee, Brian D.;

A two-speed drive utilizing an electromagnetically operated control system wired with respective drive motors, automatically braked in the event of a loss of power, provided with pre-assembled clutch and brake disc stacks, and provided with a manual over-ride. A primary drive motor is connected at one end to an external drive shaft and at an opposite end to a primary clutch drive shaft. The primary clutch drive shaft is connected with a first set of discs of an oil shear clutch disk stack. A secondary clutch drive shaft is connected with a second set of discs of the clutch disk stack. The clutch disc stack is biased by springs to be in a normally clamped mode which is released by a clutch electromagnetic coil assembly. The secondary clutch drive shaft is connected by a gear reducer to a shaft which is connected at one end to a secondary drive motor, and at the other end to a first set of discs of an oil shear brake disk stack. A second set of discs of the brake disk stack is connected to a housing component. The brake disc stack is biased by springs to be in a normally clamped mode, which is released by operation of a brake electromagnetic coil assembly. The clutch and brake disc stacks are pre-assembled and held in a pre-aligned orientation by a plurality of alignment pins and wave washers carried on the alignment pins. A manual over-ride is provided which permits selective release of spring biasing with respect to the brake disc stack so that a manual crank may be operated.

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GROUND OF THE INVENTION