# US 2013/0239796 A1 · Hydrostatic axial piston machine

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- Number: US 2013/0239796 A1
- Document ID: US20130239796A1
- Status: Published application
- Kind: A1
- Application number: 13/616,178
- Filed: 2012-09-14
- Published: 2013-09-19
- Earliest claimed: 2011-09-15
- Assignees: Robert Bosch GmbH
- Inventors: Martin Zug
- Web page: https://patentgrep.com/patent/US20130239796A1

## CPC

- F04B 1/295: by changing the inclination of the swash plate
- F04B 1/324: by changing the inclination of the swash plate
- F04B 49/002: {Hydraulic systems to change the pump delivery}
- F04B 49/08: Regulating by delivery pressure
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)

## Abstract

An adjustable hydrostatic axial piston machine of swash plate design includes an actuating apparatus with a cylinder/piston unit and an actuating spring. The actuating apparatus is configured to adjust a pivot cradle of the axial piston machine. The actuating spring engages around at least one axial section of the cylinder/piston unit.

## Claims

### Claim 1

A hydrostatic axial piston machine, comprising:
a housing;
an adjustable swash plate mounted in the housing such that it is configured to be pivoted via a pivot cradle; and
an actuating apparatus having a cylinder/piston unit and an actuating spring, the actuating apparatus being configured to set a pivoting angle of the pivot cradle,
wherein the actuating spring engages around at least one axial section of the cylinder/piston unit.

### Claim 2 (depends on 1)

The hydrostatic axial piston machine according to claim 1, wherein the cylinder/piston unit is arranged radially adjacently to a cylinder drum of the axial piston machine.

### Claim 3 (depends on 1)

The hydrostatic axial piston machine according to claim 1, wherein a longitudinal axis of the cylinder/piston unit is approximately parallel to a rotational axis of a cylinder drum of the axial piston machine.

### Claim 4 (depends on 1)

The hydrostatic axial piston machine according to claim 1, wherein the cylinder/piston unit includes an actuating cylinder having an end section, the end section being arranged on the housing or on a part that is fixed to the housing.

### Claim 5 (depends on 4)

The hydrostatic axial piston machine according to claim 4, further comprising an actuating piston configured to be displaced axially in the actuating cylinder, the actuating piston being supported via a sliding pad on a sliding face of the pivot cradle or the swash plate.

### Claim 6 (depends on 4)

The hydrostatic axial piston machine according to claim 4, wherein the actuating spring has a first end section and a second end section, the first end section being coupled to an axially displaceable guide disk that circumferentially engages around the actuating cylinder, the second end section being coupled to a radial shoulder of the actuating cylinder, the guide disk being connected via a drawing mechanism to an articulation point of the pivot cradle.

### Claim 7 (depends on 6)

The hydrostatic axial piston machine according to claim 6, wherein the guide disk is arranged between the radial shoulder and the end section of the actuating cylinder.

### Claim 8 (depends on 6)

The hydrostatic axial piston machine according to claim 6, further comprising a securing element arranged on the actuating cylinder between the guide disk and the end section of the actuating cylinder.

### Claim 9 (depends on 6)

The hydrostatic axial piston machine according claim 6, wherein the pivot cradle has a lever arm, the drawing mechanism engaging around the lever arm or being hooked into a notch of the lever arm.

### Claim 10 (depends on 6)

The hydrostatic axial piston machine according to claim 6, wherein the drawing mechanism is mounted on the guide disk such that it is configured to be rotated, pivoted, or tilted about a respective rotational, pivot, or tilting axis, the rotational, pivot, or tilting axis being approximately parallel to a pivot axis of the pivot cradle.