Hydrostatic axial piston machine

Patent metadata

Field	Value
Publication number	US-10458387-B2
Application number	US-201615364538-A
Country	US
Kind code	B2
Filing date	Nov 30, 2016
Priority date	Dec 3, 2015
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A hydrostatic axial piston pump of swashplate construction, which is also configured to be operated as a motor, has a stationary control plate against which a rotating cylinder drum is tensioned. During operation, a tilting tendency of the cylinder drum arises in the direction of that quadrant of the control plate which is operatively connected to the first part of the displacement stroke of the pistons. The control plate has a supporting device configured for the cylinder drum. The supporting device is arranged adjacent to an outer edge of the control plate in the first quadrant thereof. The supporting device is configured to be formed by a hydrostatically relieved additional field.

First claim

What is claimed is:

1. A hydrostatic axial piston machine, comprising: a circular distributor plate with a high-pressure kidney-shaped aperture and a low-pressure kidney-shaped aperture; and a cylinder drum tensioned against the distributor plate, wherein a diametrical transverse axis extends through a circumferential midpoint of the low-pressure kidney-shaped aperture and bisects the low-pressure kidney-shaped aperture, wherein a diametrical center axis extends perpendicular to the transverse axis, wherein the high-pressure kidney-shaped aperture is located entirely in a quarter-circle-shaped first quadrant and a quarter-circle-shaped second quadrant of the distributor plate, the first and second quadrants each defined by the transverse axis and the center axis, wherein a hydrostatic main relief field that extends into both quadrants is arranged on the distributor plate adjacent to the high-pressure kidney-shaped aperture, wherein the distributor plate has a relief surface on an outer circumference of the main relief field, the relief surface having a center point arranged in the first quadrant, and wherein the relief surface extends to a radial outside edge of the distributor plate, and wherein the relief surface is radially spaced apart from the main relief field.

2. The hydrostatic axial piston machine according to claim 1 , wherein a supporting direction that is positioned at an angle of between 10 and 50 degrees with respect to the transverse axis is defined by the center point of the distributor plate and the center point of the relief surface.

3. The hydrostatic axial piston machine according to claim 1 , wherein the main relief field defines a contact plane of the distributor plate, and wherein the cylinder drum lies against the contact plane and the relief surface is arranged in the contact plane.

4. The hydrostatic axial piston machine according to claim 1 , wherein the complete relief surface is flat.

5. The hydrostatic axial piston machine according to claim 1 , wherein the relief surface is defined by at least one hydrostatic additional relief field.

6. The hydrostatic axial piston machine according to claim 5 , wherein the at least one additional relief field has a pocket or recess.

7. The hydrostatic axial piston machine according to claim 6 , wherein the pocket or recess is connected via an orifice to a device via which an additional relief pressure is adjustable or controllable.

8. The hydrostatic axial piston machine according to claim 7 , wherein the device has a switching valve via which the orifice is connectable to a pressure medium sink.

9. The hydrostatic axial piston machine according to claim 7 , wherein the orifice is connected to a location that is arranged between a throttle and an adjustable throttle, the throttle and the adjustable throttle defining a pressure divider circuit.

10. The hydrostatic axial piston machine according to claim 1 , wherein the relief surface is radially spaced apart from the main relief field by an outer ring of the distributor plate.

11. A hydrostatic axial piston machine, comprising: a circular distributor plate with a high-pressure kidney-shaped aperture and a low-pressure kidney-shaped aperture; and a cylinder drum tensioned against the distributor plate, wherein a diametrical transverse axis extends through a circumferential midpoint of the low-pressure kidney-shaped aperture and bisects the low-pressure kidney-shaped aperture, wherein a diametrical center axis extends perpendicular to the transverse axis, wherein the high-pressure kidney-shaped aperture is located entirely in a quarter-circle-shaped first quadrant and a quarter-circle-shaped second quadrant of the distributor plate, the first and second quadrants each defined by the transverse axis and the center axis, wherein a hydrostatic main relief field that extends into both quadrants is arranged on the distributor plate and surrounds the high-pressure kidney-shaped aperture, wherein the distributor plate has a relief surface on an outer circumference of the main relief field, the relief surface having a circumferential center point arranged in the first quadrant, wherein the relief surface extends continuously from a radial inner wall to a radial outside edge of the distributor plate and extends continuously from a first circumferential end wall to a second circumferential end wall, such that the relief surface is imperforate, and wherein the relief surface is radially spaced apart from the main relief field.

12. The hydrostatic axial piston machine according to claim 11 , wherein the relief surface is radially spaced apart from the main relief field by an outer ring of the distributor plate.

Assignees

• Bosch Gmbh Robert

Inventors

• Kopecki Josef

Classifications

• F04B1/303

  by turning the valve plate · CPC title

• F04B1/22

  having two or more sets of cylinders or pistons · CPC title

• F04B1/2042

  Valves · CPC title

• F04B1/2035 Primary

  Cylinder barrels · CPC title

• F03C1/0692

  by changing the phase relationship between the actuated element and the distribution means, e.g. turning the valve plate; turning the swash plate · CPC title