Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1985-01-02
1986-10-07
Love, John J.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
74498, 91467, 92136, B62D 312
Patent
active
046154086
ABSTRACT:
In a rack power-steering system, the axial movements of a helical pinion meshing with the rack, resulting from torque applied to the pinion, cause corresponding movements of the movable member of a control valve of the system. This is achieved through a transmission including a piston movable axially with the pinion and defining a variable-volume compartment filled with a substantially-incompressible, deformable material, such as a fluid (oil or grease) or rubber, this material being intended to transmit a control pressure to the movable member of the control valve through a rod which may be formed integrally with the movable member or as a separate member. The variable-volume compartment is located at one end of a cylindrical chamber of the box of the system within which the piston is slidable and the latter is located in a position axially intermediate the variable-volume compartment and an end of the shaft carrying the helical pinion. When the variable-volume compartment is filled with fluid, sealing devices are interposed between the piston and the wall of the cylindrical chamber and between the rod and its slide seat so as to isolate the chamber from the exterior. The sealing devices may, for example, consist of two sealing rings mounted on the external surfaces of the piston and of the rod respectively, or, for example, of two deformable diaphragms fixed around their peripheries to the wall of the cylindrical chamber with their central parts pressed against the piston and against the rod respectively by the fluid in the variable-volume compartment.
REFERENCES:
patent: 4299302 (1981-11-01), Nishikawa
patent: 4351228 (1982-09-01), Schultz
CORINT S.r.l.
Dukes Mark C.
Love John J.
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