Motor vehicles – Steering by driving – Combined with manual steering
Patent
1996-11-27
1999-01-12
Oberleitner, Robert J.
Motor vehicles
Steering by driving
Combined with manual steering
180 944, 475 19, 475 27, B62D 600
Patent
active
058575324
ABSTRACT:
A differential steer is provided for use in a machine and includes a variable displacement motor operatively connected to a differential disposed between first and second output members. The variable displacement motor is an over-center type and the displacement thereof is varied from zero to maximum in both directions of movement. Pressurized fluid to drive the steer motor is received from the main system pump. A microprocessor senses the direction and rate of rotation of the steer motor output, the speed of the outputs from the differential, the magnitude of a steer input, and controls the output speed of the steer motor to the differential in response to the magnitude of the steer input. Consequently, the quantity of fluid taken from the main system pump is limited to only that necessary to rotate the steer motor at a rate necessary to satisfy the desired steer input. Since the steer motor is using only the flow necessary to rotate the steer motor output at a desired speed and the steer motor torque is generally proportional to the steer motor displacement, the overall operating efficiency is increased as compared to known differential steer systems.
REFERENCES:
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Burrows J. W.
Caterpillar Inc.
Kercher Kevin M.
Lipka Pamela J.
Oberleitner Robert J.
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