Actuating cylinder for a hydrostatic axial piston machine and hydrostatic axial piston machine with an actuating cylinder

Patent metadata

Field	Value
Publication number	US-11066932-B2
Application number	US-202016902933-A
Country	US
Kind code	B2
Filing date	Jun 16, 2020
Priority date	Jun 26, 2019
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

An actuating cylinder for an adjustment apparatus of a pivot angle of a hydrostatic axial piston machine has a hydraulic stop which connects an actuating pressure chamber of the actuating cylinder to an interior of the housing of the axial piston machine if the actuating piston is maximally extended. To this end, a channel is provided on the actuating piston side, while a control edge is provided on the housing side. The control edge is formed at the interface of a stop bore with the actuating cylinder bore. The stop bore may also be a leakage bore of the axial piston machine.

First claim

The invention claimed is:

1. A hydrostatic axial piston machine with an actuating cylinder for adjusting a stroke volume of the hydrostatic axial piston machine, comprising:
an actuating cylinder bore defined in a main component of the hydrostatic axial piston machine; and
an actuating piston movably guided in the actuating cylinder bore, the actuating piston defining an actuating pressure chamber, the actuating piston having a hydraulic stop for the actuating piston at which the actuating pressure chamber is connected via at least one channel to an interior of the main component, the hydraulic stop including a stop bore defined in the main component and which forms, together with the actuating cylinder bore, an edge via which the at least one channel is opened, wherein the stop bore is configured to connect the interior of the main component to an outside of the main component.

2. The hydrostatic axial piston machine according to claim 1 , wherein the stop bore is inclined obliquely with respect to the actuating cylinder bore.

3. The hydrostatic axial piston machine according to claim 1 , wherein the stop bore and the actuating cylinder bore are formed by machining.

4. The hydrostatic axial piston machine according to claim 1 , wherein:
the actuating piston is a hollow piston having an interior which defines a part of the actuating pressure chamber, and
the at least one channel is defined in the actuating piston.

5. The hydrostatic axial piston machine according to claim 1 , wherein the hydraulic stop has a circumferential groove formed on an outer circumference of the actuating piston and into which the at least one channel opens.

6. An axial piston machine comprising:
a housing;
a swash plate located within the housing; and
an actuating cylinder comprising:
an actuating cylinder bore defined in the housing; and
an actuating piston coupled to the swash plate and movably guided in the actuating cylinder bore, the actuating piston defining an actuating pressure chamber, the actuating piston having a hydraulic stop for the actuating piston at which the actuating pressure chamber is connected via at least one channel to an interior of the housing, the hydraulic stop including a stop bore defined in the housing and which forms, together with the actuating cylinder bore, an edge via which the at least one channel is opened, wherein the stop bore extends from the interior of the housing to an outside of the axial piston machine.

7. The axial piston machine according to claim 6 , wherein the stop bore is configured to be closed with a closure.

8. The axial position machine according to claim 7 , wherein the closure is a closure screw.

Assignees

• Bosch Gmbh Robert

Inventors

• Hoffmann Felix

Classifications

• F01B3/102 Primary

  Changing the piston stroke by changing the position of the swash plate · CPC title

• F01B3/106 Primary

  by changing the inclination of the swash plate · CPC title

• F04B1/20

  having rotary cylinder block · CPC title

• F03C1/0686

  by changing the inclination of the swash plate · CPC title

• F04B1/324 Primary

  by changing the inclination of the swash plate · CPC title