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Title: Hydraulic rack steering system

Abstract: A hydraulic rack steering system is provided with a unitary seal assembly around a piston rod which is a composite of compressible toroidal gaskets having an intermediate pre-stressing ring constructed and arranged to radially stress a plastic sealing ring against a piston rod. Thus, there is a sliding sealed relationship established between the piston rod and a composite sealing assembly secured within the servocylinder. The composite sealing ring assembly is carried in an assembly housing with the components locked in place therein by a closure ring press fitted into the housing. The cover ring is spaced from the composite sealing members in order to permit clearance for the piston rod to follow bending of a rack with which the piston rod is integral and wherein the rack is subjected to bending effected by steering stress.


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Inventors: Walter, Wolfgang (Schwabisch Gmund, DE)
Breitweg, Werner (Schwabisch Gmund, DE)

Application Number: 06/240214
Filing Date: 1981-03-03
Publication_date: 1983-02-15
Assignee: Zahnradfabrik, Friedrichshafen (DE)

Primary Class(es): 180/428 92/167, 92/168, 92/88, 277/589, 92/169.100, 277/556,
Other Classes: B62D5/22; B62D5/20; B62D5/10; F16J15/18
US Patent Ref:
3528346April, 1969Lee921/65RHYDRAULIC CYLINDER
3817155June, 1974Walter92/167HYDRAULIC RACK AND PINION STEERING GEAR
3860250January, 1975Lundquist277/165SEALING DEVICE FOR PREVENTION OF LEAKAGE BETWEEN CYLINDRICAL SURFACES
4063490December, 1977Duffy92/167Rack and pinion power steering gear mechanism
4179131December, 1979Nussbaumer92/168Seal arrangements
4211152July, 1980Colletti et al.92/168Power steering motor seal
4301691November, 1981Walter180/148Rack steering mechanism

Other Refs: DE2406566
June, 1979

Primary Examiner: Peters Jr., Joseph F.
Assistant Examiner: Mcgiehan, Donn
Attorney: