High-back pressure power steering device

Details High-back pressure power steering device High-back pressure power steering device

1989-04-24

1991-08-27

Kwon, John T.

Power plants

Pressure fluid source and motor

Expansible chamber type volumetric responsive measuring...

60385, 60455, 180132, F16D 3102

Patent

active

050422502

ABSTRACT:
A hydrostatic power steering device is disclosed, which may be either a fluid controller (15) or a torque generator 111. The device is of the type including a housing (19;135) defining a fluid inlet port (29;113) and a return port (31;115). The device includes valve means (36;171) defining a neutral position and a first operating position. The device includes a gerotor mechanism (23;143) for imparting follow-up movement to the valve means in response to fluid flow through the gerotor, and a follow-up mechanism (49,51;183,185) transmits the follow-up movement to the valve means. The valve means defines a return fluid region (87,89,31g;205,197,157) which comprises part of the main fluid path. The return fluid region is isolated from the follow-up means and from the interior of the valving. The device includes a case drain port (99;219) in fluid communication with the interior of the valving such that the return port of the device may be connected to a downstream, pressurized device, while the interior of the valving (case drain region) is maintained at a relatively low pressure to avoid damage to seals (59;140) and bearings (57;142).

REFERENCES:
patent: 3478648 (1969-11-01), D'Alba
patent: 4730544 (1988-03-01), Jorgensen
patent: 4936094 (1990-06-01), Novacek

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