Hydraulic system for controlling a mower unit through a raising

Details Hydraulic system for controlling a mower unit through a raising Hydraulic system for controlling a mower unit through a raising

1996-04-09

1998-05-05

Nguyen, Hoang

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

60484, 60487, F15B 1108, F16D 3900

Patent

active

057461090

ABSTRACT:
A hydraulic system for controlling a mower unit through a raising and lowering mechanism. This system includes a hydraulic cylinder connected to the raising and lowering mechanism, a control lever for controlling the mower unit, and a valve unit including a main control valve, an auxiliary control valve and a throttle valve connected in series between a hydraulic pressure source and the hydraulic cylinder. In response to operation of the control lever, the valve unit selectively produces a raising state for supplying pressure oil to the hydraulic cylinder to raise the mower unit, a lowering state for draining pressure oil from the hydraulic cylinder to lower the mower unit by gravity, a neutral state for stopping supply and drainage of pressure oil to/from the hydraulic cylinder to maintain mower unit still, and a half floating state for supplying pressure oil to the hydraulic cylinder and draining pressure oil from the hydraulic cylinder through the throttle valve to apply to the mower unit a raising force less than a gravitational lowering force. The auxiliary control valve is controllable in response to movement of the main control valve, to produce the half floating state when the control lever moves from a lowering position to a neutral position.

REFERENCES:
patent: 4962675 (1990-10-01), Aoi et al.
patent: 5074194 (1991-12-01), Hirata et al.
patent: 5079919 (1992-01-01), Nakamura et al.
patent: 5101627 (1992-04-01), Fuji et al.
patent: 5333452 (1994-08-01), Dameron

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