Speed control system for wheeled hydraulic traveling vehicle

Details Speed control system for wheeled hydraulic traveling vehicle Speed control system for wheeled hydraulic traveling vehicle

2005-09-06

2005-09-06

Ellis, Christopher P. (Department: 3618)

Motor vehicles

Power

Including traction motor of kind driven by noncompressible...

C180S307000, C701S050000, C060S443000, C060S431000

Reexamination Certificate

active

06938719

ABSTRACT:
Control valves are respectively provided in a pair of variable displacement hydraulic pumps. If an ultra low speed travel signal is issued in response to an ultra-low-speed switch turned on, one of the control valves is fixed to a neutral position by a solenoid valve. And a displacement amount of a travel motor is fixed at a maximum displacement by another solenoid valve. In this way, an upper limit for motor rotation speed is significantly reduced. As a result, it is possible to realize the ultra low speed travel with maximum operation of an accelerator pedal, without the need for subtle operation of the accelerator pedal.

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