Power steering system

Details Power steering system Power steering system

1996-02-28

1998-04-14

Lopez, F. Daniel

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

F15B 910

Patent

active

057379955

ABSTRACT:
A power steering control valve (22) includes inner and outer valve members (40 and 42) which are rotatable relative to each other. A force transmitting assembly (114) is operable to transmit force which resists relative rotation between the valve members. A pressure chamber (138) is connected in fluid communication with a pump (24) and controls operation of the force transmitting assembly (114). The pump (24) supplies fluid at a relatively high flow rate during operation of the pump at a low speed and supplies fluid at a relatively low flow rate during operation of the pump at a relatively high speed. A secondary valve assembly (170) is connected in fluid communication with the pressure chamber (138) and defines an orifice (182 or 184) through which pressure is vented from the pressure chamber. The secondary valve assembly (170) is operated in response to relative rotation between the inner and outer valve members (40 and 42).

REFERENCES:
patent: 4217932 (1980-08-01), Bacardit
patent: 4619339 (1986-10-01), Futaba et al.
patent: 4819545 (1989-04-01), Dymond
patent: 4858712 (1989-08-01), Neff
patent: 5135068 (1992-08-01), Emori et al.
patent: 5293954 (1994-03-01), Dymond
patent: 5339917 (1994-08-01), Eberhart
patent: 5357845 (1994-10-01), Sangret
patent: 5465805 (1995-11-01), Sangret

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