Inching and pressure regulating valves for clutches

Details Inching and pressure regulating valves for clutches Inching and pressure regulating valves for clutches

1974-02-15

1976-04-06

Wyche, Benjamin W.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192 13R, 192109F, 1375962, F16D 6704, F16D 2510

Patent

active

039483665

ABSTRACT:
Clutch controlling apparatus which may be utilized in industrial-type vehicles, such as for example, forklift trucks, for controlling the vehicle during inching operations includes a source of fluid pressure, a fluid pressure-type clutch fluidically connected to the pressure source, an inching valve disposed within the fluid circuit connecting the fluid pressure source and the clutch mechanism which controls the degree to which the clutch mechanism is actuated and which in turn is actuated to a degree which is dependent upon the depression of the vehicle brake pedal, and limitng means for selectively inactivating the inching valve such that the inching valve is inoperative independent of the brake pedal.
In this manner, when the vehicle is being operated on level ground, the inching operation is performed by intermittently depressing the brake pedal which actuates the inching valve which in turn deactivates the clutch mechanism thereby terminating driving torque to the vehicle transmission. When the vehicle is operated upon ground having a downward slope, the limiting means inactivates the inching valve whereupon depression of the brake pedal does not actuate the inching valve so as to deactuate the clutch mechanism. Consequently, the vehicle is not effectively placed in a neutral condition and the vehicle does not operate in an uncontrolled manner and the inching operation may be performed by the braking means.
The fluid pressure from the fluid pressure source is also exhausted directly from a drain port without passing through an orifice cylindrical section, so as to maintain a predetermined pressure when the brake is not actuated.

REFERENCES:
patent: 2814371 (1957-11-01), Bolster
patent: 3181385 (1965-05-01), Siler
patent: 3631948 (1972-01-01), Ishikawa
patent: 3757915 (1973-09-01), Momose
patent: 3850273 (1974-11-01), Murakami

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