Hydrostatic axial piston machine of swash plate design with an adjustable swept volume, in particular hydrostatic axial piston pump

Patent metadata

Field	Value
Publication number	US-10408199-B2
Application number	US-201715649829-A
Country	US
Kind code	B2
Filing date	Jul 14, 2017
Priority date	Aug 25, 2016
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

A hydrostatic axial piston machine includes a housing, a cylinder barrel, and a drive shaft, which are connected together and mounted in the housing so as to rotate jointly about a first axis. The machine also includes a swash plate mounted in the housing so as to pivot about a second axis to adjust a swept volume of the machine. The machine further includes a hydraulic actuating apparatus, which has an actuating piston that delimits an actuating chamber. The machine also includes a regulating valve attached to a flange face of the housing. The regulating valve has connections situated in the flange face that are used to communicate hydraulic fluid to and from the actuating chamber. The flange face is arranged obliquely so as to enclose an angle with the second axis that is greater than 0° and smaller than 90°.

First claim

What is claimed is:

1. A hydrostatic axial piston machine of swash plate design, comprising:
a housing;
a cylinder barrel;
a drive shaft connected to the cylinder barrel in such a way that the drive shaft and the cylinder barrel are rotationally fixed relative to one another, the drive shaft and cylinder barrel mounted in the housing so as to rotate jointly about a first axis;
a swash plate mounted in the housing so as to be pivoted about a second axis in order to adjust a swept volume of the hydrostatic axial piston machine;
a hydraulic actuating apparatus with an actuating piston that delimits an actuating chamber, the actuating piston is guided rectilinearly in an actuating chamber bore of the housing, and wherein the swash plate is configured to be pivoted by the actuating piston; and
a regulating valve that is attached to a attachment face of the housing, the attachment face being arranged at a side of the actuating chamber bore, the regulating valve comprising:
a pressure connector which lies above a pressure opening of the housing which is arranged in the attachment face,
a control connector which lies above a control opening of the housing which is arranged in the attachment face, and
a tank connector which lies above a tank opening of the housing which is arranged in the attachment face,

wherein, via the regulating valve, hydraulic fluid is (i) fed from the pressure connector via the control connector to the actuating chamber and (ii) displaced out of the actuating chamber via the control connector to the tank connector,
wherein the attachment face is arranged obliquely such that a normal of a plane in which the attachment face lies defines an angle relative to the second axis that is greater than 0° and smaller than 90°,
wherein the housing has a pot-like main housing part and a connector plate, the swash plate being mounted in the main housing part and the connector plate lying on a free end face of the main housing part,
wherein a high pressure duct is arranged in the connector plate, and
wherein the pressure opening of the housing is connected fluidically to the high pressure duct in the connector plate at least via a first bore which emanates from the end face of the main housing part.

2. The hydrostatic axial piston machine according to claim 1 , wherein the angle between the normal and the second axis lies between 40° and 70°.

3. The hydrostatic axial piston machine according to claim 2 , wherein the angle between the normal and the second axis lies between 45° and 65°.

4. The hydrostatic axial piston machine according to claim 1 , further comprising a bore leading from the control opening in the attachment face of the housing directly into the actuating chamber bore of the housing.

5. The hydrostatic axial piston machine according to claim 1 , further comprising a second bore emanating from the pressure opening in the attachment face, wherein the second bore meets the first bore that emanates from the end face of the main housing part.

6. The hydrostatic axial piston machine according claim 1 , wherein the actuating chamber bore is arranged in the main housing part, and wherein a third bore in the main housing part (i) is connected to the first bore which emanates from the end face of the main housing part and (ii) leads into the actuating chamber bore.

7. The hydrostatic axial piston machine according to claim 1 , wherein:
the actuating chamber bore is arranged in the main housing part and the axis of the actuating chamber bore lies in a second plane that lies perpendicularly on the second axis,
the first bore which emanates from the end face of the main housing part and is connected fluidically to the high pressure duct of the connector plate is arranged on one side of the second plane and the attachment face is arranged on the other side of the second plane, and
a fourth bore which leads past the actuating chamber bore on the outside such that the fourth bore crosses the second plane or opens into the actuating chamber bore belongs to the fluid path which emanates from the free end face of the main housing part and leads to the pressure opening in the attachment face.

8. The hydrostatic axial piston machine according to claim 1 , wherein the actuating chamber bore runs obliquely with respect to the first axis.

9. The hydrostatic axial piston machine according to claim 1 , wherein a bore which emanates from the tank opening in the attachment face leads directly into the interior of the housing.

10. The hydrostatic axial piston machine according to claim 1 , wherein the hydrostatic axial piston machine is configured as a hydrostatic axial piston pump.

Assignees

• Bosch Gmbh Robert

Inventors

• Drixler Daniel
• Leipersberger Erik

Classifications

• F01B3/007

  Swash plate · CPC title

• F04B1/2028

  Bearings · CPC title

• F04B1/324 Primary

  by changing the inclination of the swash plate · CPC title

• F04B1/2014

  Details or component parts · CPC title

• F04B1/2085 Primary

  Bearings for swash plates or driving axles · CPC title