Speed control structure

Details Speed control structure Speed control structure

1989-11-01

1991-04-23

Herrmann, Allan D.

Machine element or mechanism

Elements

Gear casings

192 357, 475303, F16H 5702, F16H 512

Patent

active

050091255

ABSTRACT:
A speed control structure for a working vehicle comprises a hydraulic clutch, a main change speed device and an auxiliary change speed device mounted in a transmission case. A hydraulic control system includes hydraulic actuators for operating the change speed devices, a speed control valve for controlling the actuators, a pilot operated switch valve operatively connected to the actuators for disengaging the clutch at start of a change speed operation by the actuators, and engaging the clutch upon completion of the change speed operation, and a pilot control valve for controlling a pilot pressure for the switch valve in response to the operation of the actuators. The transmission case defines a lateral opening closed by a lid. The lid carries the actuators mounted on an inside face thereof, the switch valve and the speed control valve mounted on an outside face thereof, and the pilot control valve mounted in an interior thereof.

REFERENCES:
patent: 4782719 (1988-11-01), Yarnell
patent: 4796486 (1989-01-01), Binger et al.
patent: 4805490 (1989-02-01), Fuehrer et al.

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