Motor vehicles – Steering by driving – Independently operable drive motors
Patent
1979-06-13
1981-05-12
Silverstrim, John P.
Motor vehicles
Steering by driving
Independently operable drive motors
60428, 60445, 180 666, 180 67, B62D 1104
Patent
active
042666260
ABSTRACT:
PCT No. PCT/US79/00415 Sec. 371 Date June 13, 1979, Sec. 102(e) Date June 13, 1979 PCT Filed June 13, 1979 PCT Pub. No. WO80/02824 PCT Pub. Date Dec. 24, 1980
The drives (34,34') of a vehicle are each driven by a pump (18) and motor (22) of a hydrostatic transmission (23). A servo-system (20) associated with each pump (18) is adapted to be controlled by a steering arrangement (35,36) for selectively rotating the drives (34,34') relative to each other. An interlock valve (43,44) is associated with each steering arrangement to stop the drives (34,34') of the vehicle when steering pedals (37,38) thereof are both depressed into certain positions (N,R) of operation. Thus, the operator of the vehicle is prevented from placing the vehicle in an unwanted mode of operation, such as in reverse, when the operator desires another mode of operation, such as braking of the vehicle.
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Caterpillar Tractor Co.
Silverstrim John P.
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