Hydraulic system for controlling engagement of frictional coupli

Details Hydraulic system for controlling engagement of frictional coupli Hydraulic system for controlling engagement of frictional coupli

1991-06-19

1992-08-11

Lorence, Richard

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

1376256, 251 47, B60K 4104

Patent

active

051368986

ABSTRACT:
In order to improve only a pressure variation characteristic of hydraulic fluid supplied to a hydraulically actuable frictional coupling, but also a pressure variation characteristic thereof discharged from the coupling, a pressure regulator valve is provided which has a signal pressure port connected via a fluid passage to a shift valve. An accumulator is connected to the fluid passage at a portion between one end and an opposite end of the fluid passage. The pressure regulator valve is operative to cause a change in hydraulic fluid pressure supplied to the coupling in response to a change in a signal pressure at the signal pressure port.

REFERENCES:
patent: 4722251 (1988-02-01), Sumiya et al.
patent: 4807496 (1989-02-01), Hayasaki et al.
patent: 4889016 (1989-12-01), Kuwayama et al.
patent: 4911036 (1990-03-01), Ueki et al.
patent: 4938103 (1990-07-01), Sugano
patent: 4972739 (1990-11-01), Ueki et al.

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