Pressure regulating valve in a hydraulic control system for an a

Details Pressure regulating valve in a hydraulic control system for an a Pressure regulating valve in a hydraulic control system for an a

1996-12-30

1999-02-09

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

25112916, F15B 13044

Patent

active

058681671

ABSTRACT:
A pressure regulating valve in a hydraulic control system for an automatic transmission according including a pressure regulating unit having a spool made slidable in a valve sleeve 10. An electromagnetic unit for causing a hollow core (or stator) is provided to attract a plunger (or movable element) arranged on a push rod communicating with the spool. The spool is moved by a spool moving mechanism in a direction to increase the flow from an input port to an output port to thereby raise an output pressure from an output port when the output pressure is lowered by a leakage. The spool position is controlled to control the output pressure in accordance with a balance among a spring force of spring means fitted in the valve sleeve, a feedback force resulting from the output pressure, and an electromagnetic attraction to be established in response to an electric signal provided to the electromagnetic unit having the hollow core and the plunger. In another embodiment, an input pressure feedback port is provided in the valve sleeve, and spool position control is additionally dependent upon an input pressure feedback force provided to the input pressure feedback port.

REFERENCES:
patent: 4971116 (1990-11-01), Suzuki et al.
patent: 5197507 (1993-03-01), Miki et al.
patent: 5259414 (1993-11-01), Suzuki

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