Glide shoe of a hydraulic piston machine

Claim 1

In a hydraulic piston machine of the type having a housing, a reciprocable piston in the housing, and a piston-reciprocating element having a glide surface and operating for reciprocating the piston, a combination comprising a glide shoe articulately connected to said piston and moving relative to the piston-reciprocating element in a first direction, said glide shoe having a glide face in sliding contact with said glide surface of the piston-reciprocating element, said glide shoe having at least one bore communicating with an interior of said housing and extending toward said glide face so that a working medium which flows through said bore causes build-up of a hydrostatic pressure between said bore and said glide surface of said piston-reciprocating element, said glide face being continuous and being interrupted only by recess means which occupies not more than a relatively small portion of said glide face and consists of an outlet of said bore which opens at said glide face of said glide shoe and, at least one groove which extends on said glide face of said glide shoe only in said first direction and is narrow in a second direction which is transverse to said first direction, so that the width of said groove measured in said second direction is considerably smaller than the length of the same measured in said first direction and no grooves extending in a direction other than said first direction are provided on said glide face, whereby a relatively high hydrodynamic pressure can build up between the remainder portion of said glide face of said glide shoe and said glide surface of said piston-reciprocating element during working movement of said glide shoe relative to the piston-reciprocating element.