Machine element or mechanism – Gearing – Plural power paths to and/or from gearing
Patent
1986-08-05
1988-04-19
Staab, Lawrence
Machine element or mechanism
Gearing
Plural power paths to and/or from gearing
74665T, 180 67, F16H 1445
Patent
active
047381612
ABSTRACT:
A vehicle steerable differential which includes a cage which encloses a differential unit in a manner that rotation of the cage drives wheeled or tracked axles to propel the vehicle. The axles are operatively engaged to respective spur gears via intermediate roller gears. If there is no braking pressure applied to either one of the spur gears by a manual steering brake, the spur gears rotate with the cage and the vehicle maintains its direction of travel. If a braking force is applied to one of the spur gears however, causing its rotational velocity to slow relative to the cage, the intermediate roller gear which is engaged to the slowed spur gear is caused to rotate thereby increasing the rotational velocity of the corresponding axle and causing the vehicle to turn. The rotational velocity of the opposing axle is reduced by means of the differential unit. A quick turn is initiated by a quick turn assembly which causes a selected one of the spur gears to stop its rotation. The resulting increase in the velocity of the axle corresponding to the nonrotating spur gear causes the opposing axle to slow down and rotate in an opposite direction to turn the vehicle in a rapid manner. An antispin assembly is provided for delivering a positive driving force to both axles in the event that the rotation of one of the vehicle tracks is impeded and the other track is caused to spin due to a substantial difference in the coefficients of friction between the ground and the tracks. The antispin assembly causes a reduction in the rotational velocity of the spur gear on the nonspinning side so as to decrease the velocity of the spinning axle and to generate a driving force to the nonspinning axle.
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Diehl Dwight G.
Staab Lawrence
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