Centering the housing parts of an axial piston machine

Patent metadata

Field	Value
Publication number	US-12480402-B2
Application number	US-202418791637-A
Country	US
Kind code	B2
Filing date	Aug 1, 2024
Priority date	Aug 4, 2023
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

A hydrostatic axial piston machine is disclosed, in the housing of which a drive shaft is rotatably mounted about an axis of rotation. The housing comprises a pot-like housing part having a first abutment and a cover-like housing part having a second abutment. The two abutments are clamped against one another in a sealing manner. A first fitting pin is inserted precisely into a first fitting recess of the first abutment on the one hand and into a second fitting recess of the second abutment on the other hand. A second fitting pin is provided on a side opposite the axis of rotation, which is inserted precisely into a third fitting recess of the first abutment on the one hand and into a fourth fitting recess of the second abutment on the other hand. The second fitting recess has a radial widening relative to the axis of rotation, whereby the second fitting recess is a slotted hole and/or a fitting groove.

First claim

What is claimed is:

1 . A hydrostatic axial piston machine, comprising:
a housing; a drive shaft rotatably mounted in the housing about an axis of rotation, wherein the housing comprises a pot-like housing part having a first abutment and a cover-like housing part having a second abutment, and wherein the two abutments abut each other in a sealing manner; a first fitting pin inserted precisely into a first fitting recess of the first abutment on the one hand and into a second fitting recess of the second abutment on the other hand; and a second fitting pin provided on a side opposite the axis of rotation and inserted precisely into a third fitting recess of the first abutment on the one hand and into a fourth fitting recess of the second abutment on the other hand, wherein the second fitting recess has a radial widening relative to the axis of rotation, and wherein the second fitting recess is a slotted hole and/or a fitting groove.

2 . The axial piston machine according to claim 1 , wherein a radial extension of the second fitting recess is only a maximum of 7% greater than an extension of the second fitting recess in the circumferential direction.

3 . The axial piston machine according claim 1 , wherein all four fitting recesses are formed as respective blind holes.

4 . The axial piston machine according to claim 1 , wherein the two abutments of the two housing parts lie in a respective plane and are completely circumferential, and wherein a flat seal is arranged between the two abutments which has two through-recesses through which the two fitting pins extend.

5 . The axial piston machine according to claim 4 , wherein the through-recess for the first fitting pin has a radial widening relative to the axis of rotation, and wherein the through-recess is a slotted hole.

6 . The axial piston machine according to claim 1 , wherein the two housing parts are fastened to one another by way of a plurality of screws, and wherein the pot-like housing part has blind threaded holes for the screws.

7 . The axial piston machine according to claim 1 , further comprising a distribution plate having two kidney-shaped control openings clamped against the cover-like housing part, one of which is configured to act as a high-pressure kidney and the other of the two kidney-shaped control openings of which is configured as a low-pressure kidney during operation of the axial piston machine, and wherein the drive shaft is mounted in the cover-like housing part by way of a rolling bearing, and wherein the distribution plate has a central recess having an inner edge, by way of which the distribution plate is mounted on an outer ring of the rolling bearing.

8 . The axial piston machine according to claim 7 , wherein in an abutment region of the cover-like housing part, against which the distribution plate is clamped, at least one cast radial recess is provided, extending in the radial direction and which is further formed by the distribution plate to form a radial channel section connecting an outer circumferential region of the distribution plate and thus an interior of the housing to the outer ring of the rolling bearing.

9 . The axial piston machine according to claim 8 , wherein a control opening is provided in the distribution plate that is fluidically connected to the cast radial recess, and wherein a radial outer end section of a groove base of the cast radial recess has a slope in the area of the outer edge of the distribution plate.

10 . The axial piston machine according to claim 8 , wherein, when viewed along the axis of rotation, a cast space is provided axially adjacent to the rolling bearing on a side of the rolling bearing opposite the distribution plate in the cover-like housing part, wherein at least one cast axial recess is formed in an inner case section of the cover-like housing part, against which the outer ring of the rolling bearing abuts, extending in the axial direction, and which is further formed by the outer ring to an axial channel, connecting the radial channel section to the cast space.

11 . The axial piston machine according to claim 8 , wherein an alignment recess of the cover-like housing part is arranged in the cast radial recess.

12 . The axial piston machine according to claim 8 , wherein an alignment recess of the cover-like housing part is arranged between two arms of the cast radial recess.

13 . The axial piston machine according to claim 8 , wherein an alignment recess of the cover-like housing part is arranged adjacent to the cast radial recess.

14 . The axial piston machine according to claim 7 , further comprising an alignment pin inserted into an alignment recess of the cover-like housing part on the one hand and into an alignment recess of the distribution plate on the other hand.

15 . The axial piston machine according to claim 1 , wherein two work connections of the axial piston machine are formed on the cover-like housing part, and wherein a flattened section and/or recess of the cover-like housing part is formed on an outer side of the cover-like housing part between the two work connections that is set back along the axis of rotation.

16 . The axial piston machine according to claim 1 , wherein two work connections of the axial piston machine are formed in the cover-like housing part, and wherein a pre-compression volume is arranged in the cover-like housing part between the two work connections.

Assignees

• Bosch Gmbh Robert

Inventors

• Zug Martin
• Merz Stefan
• Hoffmann Felix
• Sell Manuel

Classifications

• F04B1/2071

  Bearings for cylinder barrels · CPC title

• F04B1/2028

  Bearings · CPC title

• F01B3/0041

  Arrangements for pressing the cylinder barrel against the valve plate, e.g. fluid pressure · CPC title

• F04B1/2064

  Housings · CPC title

• F04B1/2021

  characterised by the contact area between cylinder barrel and valve plate · CPC title