Sliding shoe for a hydrostatic axial piston machine

Patent metadata

Field	Value
Publication number	US-10107272-B2
Application number	US-201615154093-A
Country	US
Kind code	B2
Filing date	May 13, 2016
Priority date	May 13, 2015
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

A sliding shoe for supporting a piston of a hydrostatic axial piston machine against a swash plate includes a sliding face that defines a central concentric pressure pocket that is flat in order to stabilize the sliding shoe. The pressure pocket has radial supply grooves in order to ensure an optimal supply of pressure medium to the pressure pocket from a central mouth opening. The radial supply grooves extend through the pressure pocket and as far as a circumferential groove which surrounds the pressure pocket.

First claim

What is claimed is:

1. A sliding shoe, comprising:
a sliding side configured to bring the sliding shoe into abutment against a swash plate, the sliding side defining (i) a central relief recess configured to form a relieving pressure field, and (ii) at least one radial groove formed in the relief recess in order to be deeper than the relief recess,
wherein:
the sliding side defines a central mouth opening;
the at least one radial groove includes a first and a second radial groove, each of the first and second radial grooves extending radially outwardly from the central mouth opening; and
the first and second radial grooves are aligned with one another.

2. The sliding shoe according to claim 1 , wherein the relief recess is circular in a plane parallel to the sliding face when the sliding shoe abuts the sliding face.

3. The sliding shoe according to claim 1 , wherein:
the relief recess is surrounded by a first circumferential groove that is deeper than the relief recess, the first circumferential groove having an outer circumference that is surrounded by a sealing web;
a second circumferential groove is arranged at an outer circumference of the sealing web, the second circumferential groove having an outer circumference that is surrounded by an outer supporting web; and
the outer supporting web defines two substantially radial connecting grooves to an outer circumference of the sliding shoe, the two radial connecting grooves extending approximately at right angles to the two radial grooves.

4. The sliding shoe according to claim 3 , wherein the outer supporting web is wider than the sealing web and wider than the first and second circumferential grooves.

5. The sliding shoe according to claim 4 , wherein the outer supporting web defines at least one substantially radial connecting groove to an outer circumference of the sliding shoe.

6. The sliding shoe according to claim 3 , wherein the outer supporting web has an outer beveled peripheral region.

7. The sliding shoe according to claim 6 , wherein the peripheral region is at an angle of less than 10 degrees with respect to a sliding face.

8. A sliding shoe, comprising:
a sliding side configured to bring the sliding shoe into abutment against a swash plate, the sliding side defining (i) a central relief recess configured to form a relieving pressure field, and (ii) at least one radial groove formed in the relief recess in order to be deeper than the relief recess,
wherein the relief recess is surrounded by a first circumferential groove that is deeper than the relief recess, the first circumferential groove having an outer circumference that is surrounded by a sealing web.

9. The sliding shoe according to claim 8 , wherein the at least one radial groove extends radially to the first circumferential groove.

10. The sliding shoe according to claim 8 , wherein a second circumferential groove is arranged at an outer circumference of the sealing web, the second circumferential groove having an outer circumference that is surrounded by an outer supporting web.

11. The sliding shoe according to claim 10 , wherein the outer supporting web is wider than the sealing web and wider than the first and second circumferential grooves.

12. The sliding shoe according to claim 10 , wherein the outer supporting web defines at least one substantially radial connecting groove to an outer circumference of the sliding shoe.

13. The sliding shoe according to claim 10 , wherein the outer supporting web has an outer beveled peripheral region.

14. The sliding shoe according to claim 13 , wherein the peripheral region is at an angle of less than 10 degrees with respect to a sliding face.

15. The sliding shoe according to claim 8 , wherein the relief recess is circular in a plane parallel to the sliding face when the sliding shoe abuts the sliding face.

Assignees

• Bosch Gmbh Robert

Inventors

• Schnell Matthias
• Hoppe Stefan
• Nafz Timo

Classifications

• F04B1/2014 Primary

  Details or component parts · CPC title

• F04B1/122

  Details or component parts, e.g. valves, sealings or lubrication means (for machines or pumps having rotary cylinder blocks F04B1/2014) · CPC title

• F04B1/146

  Swash plates; Actuating elements · CPC title

• F04B1/2078

  Swash plates · CPC title

• F03C1/0605

  Adaptations of pistons (pump pistons F04B1/124, F04B53/14) · CPC title