Hydraulic control means, especially a steering means

Details Hydraulic control means, especially a steering means Hydraulic control means, especially a steering means

1975-06-20

1977-10-11

Cohen, Irwin C.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Second path activated in response to pressure or flow in...

91433, F15B 13042

Patent

active

040529290

ABSTRACT:
The invention relates to a hydraulic control apparatus of the type used in vehicle steering systems. In all such systems there is a reversible type hydraulic motor connected to the steering linkage. The motor has complementary expansible chambers. With the use of control means pressurized fluid is selectively delivered to one chamber which is caused to expand concomitantly with the collapsing of the other chamber from which fluid is returned to a sump. There is provided in the control and power circuit throttle valves having respective opening positions which correspond to the pressure difference on both sides of the valves. Between the passages which extend to the two control circuit throttle valves is a pressure comparator which is operable to vary the pressure upstream of the power circuit throttle valve in proportion to the pressure upstream of the control circuit throttle valve.

REFERENCES:
patent: 2536965 (1951-01-01), Taylor
patent: 2931389 (1960-04-01), Moog, Jr. et al.
patent: 3015317 (1962-01-01), Buchanan et al.
patent: 3213886 (1965-10-01), Pearne
patent: 3225786 (1965-12-01), Elliot
patent: 3463260 (1969-08-01), Baines et al.
patent: 3561488 (1971-02-01), Byers
patent: 3564848 (1971-02-01), Baatrup et al.
patent: 3595264 (1971-07-01), Martin
patent: 3799200 (1974-03-01), Tipton

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