Modulator and power-assisted steering circuit containing such a

Details Modulator and power-assisted steering circuit containing such a Modulator and power-assisted steering circuit containing such a

1990-03-21

1991-10-22

Marmor, Charles A.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

137501, B62D 506

Patent

active

050586971

ABSTRACT:
The modulator is intended for diverting a specific quantity of fluid under high pressure from the supply circuit of a hydraulic motor for a power-steering of motor vehicles, comprising a body (48), a bore (50) in the body, a modulator slide (52) movable axially in the bore under the action of a control member (98), an inlet orifice (58) and a fluid outlet port (60) opening into the bore (50). The slide (52) has first and second bearing surfaces (82, 84) substantially of the diameter of the bore and separated by means of a narrowed section (86), opposite which the inlet orifice (58) opens out, the second bearing surface (84) controlling the outlet port (60). Furthermore, the slide (52) defines a first chamber arranged between the first and second bearing surfaces (82, 84) and second and third chambers arranged on either side of the slide (52) and communicating with one another. Finally, the outlet port (60) communicates with an intermediate chamber (70), in the side wall of which the outlet orifice (62) of the modulator opens out and which contains a regulator slide (72) controlling the outlet orifice (62) and moving counter to a spring (78) under the effect of the difference between the pressure prevailing in the first chamber and that prevailing in the intermediate chamber.

REFERENCES:
patent: 2255787 (1941-09-01), Kendrick
patent: 4332303 (1982-06-01), deMaight
patent: 4462209 (1984-07-01), Thomsen et al.
patent: 4561521 (1985-12-01), Duffy
patent: 4609331 (1986-09-01), Duffy
patent: 4804014 (1989-02-01), Francois
patent: 4850390 (1989-07-01), Francois

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