Sliding block for a piston of a hydraulic piston machine

Patent metadata

Field	Value
Publication number	US-9273780-B2
Application number	US-201213559316-A
Country	US
Kind code	B2
Filing date	Jul 26, 2012
Priority date	Jul 29, 2011
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

A sliding block for a piston of a hydraulic piston machine, includes a concave recess to receive a piston head and a sliding surface to support the piston. A lubricant channel passes through the sliding block from the concave recess to the sliding surface, and the concave recess transforms with a constant tangent i.e. without kinking into a transition segment of a constantly narrowing taper segment of the lubricant channel. The transition segment is convex.

First claim

What is claimed is:

1. A sliding block for a piston of a hydraulic piston machine, comprising:
a concave recess structure to receive and directly contact portions of a piston head;
a sliding surface to support the piston; and
a lubricant channel structure which passes through the sliding block from the concave recess structure to the sliding surface,
wherein the sliding block has a one-piece configuration and defines the concave recess structure, the sliding surface, and the lubricant channel structure as integrally formed features thereon,
wherein the lubricant channel structure includes a continuously narrowing taper segment with a transition segment having a convex curvature,
wherein the concave recess structure transforms directly into the convex transition segment at a transition point with the convex transition segment and the concave recess structure having an identical tangent at the transition point,
wherein a curvature of a casing curve of the taper segment is everywhere greater than zero or equal to zero,
wherein the convex transition segment transforms into a connecting segment of the constantly narrowing taper segment, and
wherein the casing curve along the connecting segment comprises a line or an elliptical arc segment or a circular arc segment.

2. The sliding block according to claim 1 , wherein the curvature of the casing curve is constant along the convex transition segment.

3. The sliding block according to claim 1 , wherein the taper segment transforms into a cylindrical relief segment of the lubricant channel structure.

4. The sliding block according to claim 1 , wherein the taper segment transforms into a relief segment of the lubricant channel structure which expands constantly in the direction of the sliding surface.

5. The sliding block according to claim 1 , wherein the sliding surface has a relief recess in which is arranged a mouth of the lubricant channel structure.

6. The sliding block according to claim 5 , wherein the mouth of the lubricant channel structure has a rounding or a chamfer.

7. The sliding block according to claim 1 , wherein the lubricant channel structure is rotationally symmetrical.

Assignees

• Schnell Matthias
• Nestler Alexander
• Korte Tobias
• Bosch Gmbh Robert

Inventors

• Schnell Matthias
• Nestler Alexander
• Korte Tobias

Classifications

• F04B1/126

  Piston shoe retaining means · CPC title

• F04B1/124 Primary

  Pistons · CPC title

• F16J1/09 Primary

  with means for guiding fluids (F16J1/08 takes precedence) · CPC title