# US 2014/0150642 A1 · Axial piston engine with an inclined cylinder bore

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- Number: US 2014/0150642 A1
- Document ID: US20140150642A1
- Status: Published application
- Kind: A1
- Application number: 14/095,607
- Filed: 2013-12-03
- Published: 2014-06-05
- Earliest claimed: 2012-12-04
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Michael Ruckgaber; Zoltan Gradwohl; Rolf Brockerhoff
- Web page: https://patentgrep.com/patent/US20140150642A1

## CPC

- F01B 3/0076: {Connection between cylinder barrel and inclined swash plate}
- F02B 75/26: Engines with cylinder axes coaxial with, or parallel or inclined to, main-shaft axis; Engines with cylinder axes arranged substantially tangentially to a circle centred on main-shaft axis
- F01B: MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES (of rotary-piston or oscillating-piston type F01C; of non-positive-displacement type F01D; internal-combustion engines F02B; combustion-product engine plants F02G; machines or engines, other than of positive-displacement type, for liquids F03B; positive-displacement engines driven by liquids F03C; wind motors F03D; positive-displacement machines for liquids F04B; rotary-piston, or oscillating-piston, positive-displacement machines for liquids F04C)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)

## Abstract

An axial piston engine, in particular pump or motor, includes a housing, a drive shaft, and a cylinder drum. The drive shaft is mounted in the housing so as to be rotatable with respect to a first axis of rotation. A bearing body is received in the cylinder drum rotatably with respect to a second axis of rotation. The bearing body is connected to the drive shaft via a first ball joint that has a joint center lying on the first axis of rotation. The cylinder drum has at least one circular-cylindrical cylinder bore in which an elongated piston is displaceably received. A first end of the piston is connected to the drive shaft via a second ball joint. The at least one cylinder bore is arranged at an inclination to the second axis of rotation.

## Claims

### Claim 1

An axial piston engine, comprising:
a housing;
a drive shaft mounted rotatably in the housing with respect to a first axis of rotation;
a cylinder drum defining at least one circular-cylindrical cylinder bore;
a bearing body received rotatably in the cylinder drum with respect to a second axis of rotation, the bearing body being connected to the drive shaft via a first ball joint, the first ball joint having a joint center which lies on the first axis of rotation; and
an elongated piston received displaceably in the at least one circular-cylindrical cylinder bore, the piston having a first end connected to the drive shaft via a second ball joint,
wherein the at least one cylinder bore is arranged at an inclination to the second axis of rotation.

### Claim 2 (depends on 1)

The axial piston engine according to claim 1, wherein the inclination angle between the second axis of rotation and the at least one cylinder bore amounts to between 0.4° and 3°.

### Claim 3 (depends on 1)

The axial piston engine according to claim 1, wherein the mid-axis of the cylinder bore intersects the second axis of rotation on that side of the cylinder drum which faces away from the drive shaft.

### Claim 4 (depends on 1)

The axial piston engine according to claim 1, wherein a plurality of cylinder bores are all arranged so as to be inclined to the second axis of rotation at the same inclination angle.

### Claim 5 (depends on 1)

The axial piston engine according to claim 1, wherein the piston has a circular-conical portion that tapers toward the first end of the piston in such a way that the portion is linearly supported, at least indirectly, against the respective cylinder bore in at least one rotary position of the drive shaft.

### Claim 6 (depends on 1)

The axial piston engine according to claim 1, wherein the piston has a one-piece basic body that, at the first end, has a ball head of the second ball joint, the piston bearing directly at the opposite second end against the respective cylinder bore.

### Claim 7 (depends on 5)

The axial piston engine according to claim 5, wherein the piston has a one-piece basic body that, at the first end, has a ball head of the second ball joint, the piston bearing directly at the opposite second end against the respective cylinder bore, and wherein the circular-conical portion is configured on the basic body.

### Claim 8 (depends on 1)

The axial piston engine according to claim 1, wherein the axial piston engine is configured as a pump or a motor.

### Claim 9 (depends on 2)

The axial piston engine according to claim 2, wherein the inclination angle amounts to between 0.6° and 1.2°.