Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1997-06-06
1998-10-20
Nguyen, Hoang
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
F15B 910
Patent
active
058230904
ABSTRACT:
A power steering apparatus in which an adjusting operation for an orifice, which is provide to optimize a steering characteristic, can be easily performed. A rotary control valve controls an amount of working oil to be supplied to a power assist cylinder in response to a relative rotation between an input member and an output member. A counter force mechanism, provided in the rotary control valve, includes a counter force plunger, a hydraulic pressure counter force chamber located on an outer side of the counter force plunger and an inside chamber located on an inner side of the counter force plunger. The counter force mechanism provides a counter force to the input member by a pressure difference between a pressure of the working oil in the hydraulic pressure counter force chamber and a pressure of the working oil in the inside chamber. A hydraulic pressure control valve is attached to the rotary control valve. The hydraulic pressure control valve includes a counter force mechanism port through which the working oil is supplied to the counter force mechanism. A connection passage connects between the inside chamber and the counter force mechanism port. An orifice is provided to a part of a connection passage located in the hydraulic pressure control valve.
REFERENCES:
patent: 4796715 (1989-01-01), Futaba et al.
patent: 4905784 (1990-03-01), Yamashita
patent: 5016723 (1991-05-01), Sano
patent: 5046574 (1991-09-01), Goodrich, Jr. et al.
patent: 5190119 (1993-03-01), Nomura et al.
Nguyen Hoang
Toyota Jidosha & Kabushiki Kaisha
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