Hydrostatic axial piston machine

Patent metadata

Field	Value
Publication number	US-10584690-B2
Application number	US-201816058676-A
Country	US
Kind code	B2
Filing date	Aug 8, 2018
Priority date	Aug 8, 2017
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

A hydrostatic axial piston machine includes a housing and a pivot cradle. At least one slide bearing of the pivot cradle on a high-pressure side is hydrostatically relieved. The slide bearing includes one or two pairs of relief grooves. A relief pressure field develops about and between the one or two pairs of relief grooves as the grooves are supplied with relief pressure medium on one side and are closed at their outer ends. An optional slide bearing on a low-pressure side has one or two limiting grooves which delimit the relief pressure field there, as the limiting grooves are open at their outer ends.

First claim

What is claimed is:

1. A hydrostatic axial piston machine, comprising:
a housing; and
a pivot cradle configured to adjust a stroke volume and mounted in the housing via a slide bearing, the slide bearing having a first pair of bearing faces and a second pair of bearing faces, a bearing face of at least the first pair of bearing faces including a depression,
wherein at least two hydrostatic relief grooves spaced apart from one another extend from the depression in a circumferential direction of the bearing face such that the at least two hydrostatic relief grooves are configured to be exposed to the same relief pressure,
wherein the depression and the at least two hydrostatic relief grooves form a part of a first pressure relief field,
wherein (i) the at least two hydrostatic relief grooves are closed at two end portions of the at least two hydrostatic relief grooves spaced apart from one another oriented in a circumferential direction, and/or (ii) a partial region of the bearing face is arranged between the two end portions of the at least two hydrostatic relief grooves spaced apart from one another oriented in the circumferential direction, and
wherein the depression includes an extension in the circumferential direction which is greater than a width of the at least two hydrostatic relief grooves.

2. The hydrostatic axial piston machine according to claim 1 , further comprising:
at least two second relief grooves extending from the depression against the circumferential direction,
wherein (i) the at least two second relief grooves are closed at two second end portions of the at least two second relief grooves spaced apart from one another oriented against the circumferential direction and/or (ii) a further partial region of the bearing face is arranged between the two second end portions of the at least two second relief grooves spaced apart from one another against the circumferential direction.

3. The hydrostatic axial piston machine according to claim 2 , wherein the depression is deeper than the at least two hydrostatic relief grooves and the at least two second relief grooves.

4. The hydrostatic axial piston machine according to claim 2 , wherein the depression is fluidically connected to a pressure medium channel arranged on a housing side.

5. The hydrostatic axial piston machine according to claim 4 , wherein:
a further bearing face on the housing side is formed on a bearing shell, the bearing shell fastened to the housing via a screw; and
a portion of the pressure medium channel is arranged in the screw.

6. The hydrostatic axial piston machine according to claim 4 , wherein the at least two hydrostatic relief grooves, the at least two second relief grooves, and the depression are arranged on the bearing face of the first pair of bearing faces on a pivot cradle side.

7. The hydrostatic axial piston machine according to claim 1 , wherein the depression is fluidically connected to a pressure medium channel arranged on a pivot cradle side.

8. The hydrostatic axial piston machine according to claim 7 , wherein the pressure medium channel is configured to be connected to cylinder chambers.

9. The hydrostatic axial piston machine according to claim 7 , wherein:
the second pair of bearing faces includes a second relief pressure field; and
a second pressure medium channel opens into the second relief pressure field.

10. The hydrostatic axial piston machine according to claim 9 , further comprising:
a first limiting groove and a second limiting groove delimiting the second relief pressure field, wherein the first and second limiting grooves are spaced apart from one another in a second bearing face of the second pair of bearing faces and connected to an inner chamber of the housing via an opening.

11. The hydrostatic axial piston machine according to claim 10 , wherein:
the first limiting groove starting from the second relief pressure field extends in a circumferential direction;
the second limiting groove starting from the second relief pressure field extends against the circumferential direction; and
the first and second limiting grooves are connected to the inner chamber at end portions of the first and second limiting grooves pointing away from one another.

12. The hydrostatic axial piston machine according to claim 10 , wherein the second limiting groove is longer than the first limiting groove.

13. A hydrostatic axial piston machine, comprising:
a housing; and
a pivot cradle configured to adjust a stroke volume and mounted in the housing via a slide bearing, the slide bearing having a first pair of bearing faces and a second pair of bearing faces, a bearing face of at least the first pair of bearing faces including a depression,
wherein at least two hydrostatic relief grooves spaced apart from one another extend from the depression in a circumferential direction of the bearing face such that the at least two hydrostatic relief grooves are configured to be exposed to the same relief pressure,
wherein the depression and the at least two hydrostatic relief grooves form a part of a first pressure relief field,
wherein (i) the at least two hydrostatic relief grooves are closed at two end portions of the at least two hydrostatic relief grooves spaced apart from one another oriented in a circumferential direction, and/or (ii) a partial region of the bearing face is arranged between the two end portions of the at least two hydrostatic relief grooves spaced apart from one another oriented in the circumferential direction,
wherein at least two second relief grooves extend from the depression against the circumferential direction,
wherein (i) the at least two second relief grooves are closed at two second end portions of the at least two second relief grooves spaced apart from one another oriented against the circumferential direction and/or (ii) a further partial region of the bearing face is arranged between the two second end portions of the at least two second relief grooves spaced apart from one another against the circumferential direction, and
wherein the at least two second relief grooves are longer than the at least two hydrostatic relief grooves.

14. A hydrostatic axial piston machine, comprising:
a housing; and
a pivot cradle configured to adjust a stroke volume and mounted in the housing via a slide bearing, the slide bearing having a first pair of bearing faces and a second pair of bearing faces, a bearing face of at least the first pair of bearing faces including a depression,
wherein at least two hydrostatic relief grooves spaced apart from one another extend from the depression in a circumferential direction of the bearing face such that the at least two hydrostatic relief grooves are configured to be exposed to the same relief pressure,
wherein the depression and the at least two hydrostatic relief grooves form a part of a first pressure relief field,
wherein (i) the at least two hydrostatic relief grooves are closed at two end portions of the at least two hydrostatic relief grooves spaced apart from one another oriented in a circumferential direction, and/or (ii) a partial region of the bearing face is arranged between the two end portions of the at least two hydrostatic relief grooves spaced apart from one another oriented in the circumferential direction,
wherein the depression is fluidically connected to a pressure medium channel arranged on a housing side,
wherein the at least two hydrostatic relief grooves and the depression are arranged on the bearing face of the first pair of bearing faces on a pivot cradle side, and
wherein an extension of the depression in the circumferential di

Assignees

• Bosch Gmbh Robert

Inventors

• Roehm Joachim

Classifications

• F04B1/324 Primary

  by changing the inclination of the swash plate · CPC title

• F03C1/0636

  having rotary cylinder block · CPC title

• F03C1/0671

  Swash or actuated plate bearing means or driven axis bearing means · CPC title

• F04B1/2085 Primary

  Bearings for swash plates or driving axles · CPC title

• F03C1/0686

  by changing the inclination of the swash plate · CPC title