Hydrostatic machine, in particular axial piston machine

Patent metadata

Field	Value
Publication number	US-9458839-B2
Application number	US-201213979514-A
Country	US
Kind code	B2
Filing date	Jan 18, 2012
Priority date	Jan 27, 2011
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

A hydrostatic machine includes a housing and a drive shaft. The housing has an inner housing part, configured to receive a force flow, an outer housing part, configured to seal and damp, and a housing floor. The drive shaft is configured, on an input side, to pass coaxially through the housing floor and is configured, on an output side, to pass coaxially through a swash plate. The drive shaft is connected to a cylinder drum in a rotationally fixed manner. The hydrostatic machine is configured in a weight-saving manner and is configured such that propagation of vibrations in the hydrostatic machine, and noise generation therefrom, are reduced. To this end, the drive shaft is further configured to pass only partially through the inner housing part and is rotatably mounted in the housing floor and the inner housing part.

First claim

The invention claimed is:

1. A hydrostatic piston machine, comprising:
a housing including an inner housing part, an outer housing part, and a housing bottom;
a cylinder barrel;
a swash plate; and
a drive shaft connected fixedly to the cylinder barrel so as to rotate with the cylinder barrel, a drive side of the drive shaft penetrating through the housing bottom coaxially, and an output side of the drive shaft penetrating through the swash plate,
wherein:
the drive shaft penetrates through the inner housing part at least partially;
the drive shaft does not penetrate the outer housing part; and
the drive shaft is mounted rotatably in the housing bottom and in the inner housing part;
the inner housing part is a frame structure with machined bearing tracks configured for the swash plate and a machined bearing configured for the drive shaft;
the frame structure has a first machined bearing track of the machined bearing tracks on a high pressure side and a second machined bearing track of the machined bearing tracks on a low pressure side, and
both the first and the second machined bearing tracks are configured to be accessed by a cutout on one of the low pressure side and the high pressure side.

2. The hydrostatic machine as claimed in claim 1 , wherein:
the outer housing part is arranged spaced apart from the inner housing part, and
the inner housing part and the outer housing part are connected to the housing bottom.

3. The hydrostatic machine as claimed in claim 1 , wherein the housing bottom is configured to form a blocking mass.

4. The hydrostatic machine as claimed in claim 1 , wherein the outer housing part is composed of an oscillation-damping material with a low weight.

5. The hydrostatic machine as claimed in claim 1 , wherein the inner housing part is a strut-shaped loadbearing frame.

6. The hydrostatic machine as claimed in claim 1 , wherein the frame structure has asymmetrical reinforcements configured to detune the loadbearing frame.

7. The hydrostatic machine as claimed in claim 1 , wherein the frame structure has at least one cross-sectional step at a transition of the frame structure to the machined bearing tracks.

8. The hydrostatic machine as claimed in claim 1 , wherein at least one compliance is introduced into the inner housing part.

9. The hydrostatic machine as claimed in claim 1 , further comprising:
at least one oscillatory system that is integrated into the inner housing part, and that includes at least one damper mass configured to swing freely relative to the inner housing part to absorb oscillation energy of the hydrostatic piston machine.

10. A hydrostatic piston machine, comprising:
a housing bottom;
a drive shaft that includes:
a drive portion that penetrates through the housing bottom such that the housing bottom rotatably supports the drive portion of the drive shaft; and
an output portion facing away from the drive portion;

a cylinder barrel coaxially mounted on the output portion of drive shaft so as to rotate with the drive shaft;
a swash plate coaxially mounted on the output portion of the drive shaft and configured to engage the cylinder barrel as the drive shaft rotates;
an inner housing part that is fixed to the housing bottom, that rotatably supports the output portion of the drive shaft in an unsealed fashion, and that includes a strut-shaped loadbearing frame having:
machined bearing tracks configured to engage the swash plate;
a machined bearing configured to rotationally support the drive shaft; and
at least one asymmetrical reinforcement configured to detune the loadbearing frame such that a high pressure side of the loadbearing frame has a different resonance than a low pressure side of the loadbearing frame; and

an outer housing part that surrounds the output portion of the drive shaft, the cylinder barrel, the swash plate, and the inner housing part to define a housing interior, the outer housing part spaced apart from the inner housing part, and the outer housing part fixed to the housing bottom in a sealed fashion to seal off the housing interior.

11. The hydrostatic piston machine as claimed in claim 10 , wherein the outer housing part is configured to be acoustically decoupled from the inner housing part.

12. The hydrostatic piston machine as claimed in claim 10 , wherein the housing bottom defines a blocking mass configured to decouple solid-borne sound of the housing bottom from a structure connected to the housing bottom.

13. The hydrostatic piston machine as claimed in claim 10 , wherein the outer housing part is formed from an oscillation-damping material that has a low weight relative to a weight of a material of the inner housing part.

14. The hydrostatic piston machine as claimed in claim 10 , wherein:
the frame has a first machined bearing track of the machined bearing tracks on a high pressure side and a second machined bearing track of the machined bearing tracks on a low pressure side, and
the frame defines a cutout on either the low pressure side or the high pressure side that enables access to both the first and second machined bearing tracks.

15. The hydrostatic piston machine as claimed in claim 10 , wherein the frame further has at least one cross-sectional step at a transition of the frame structure to the machined bearing tracks.

16. The hydrostatic piston machine as claimed in claim 10 , wherein the inner housing part includes at least one compliant member configured to cushion forces acting on at least one of the drive shaft, swash plate, and housing bottom.

17. The hydrostatic piston machine as claimed in claim 10 , further comprising:
at least one oscillatory system that is integrated into the inner housing part, and that includes at least one damper mass configured to swing freely relative to the inner housing part to absorb oscillation energy of the hydrostatic piston machine.

Assignees

• Schmitt Joachim
• Krause Peter
• Bittner Ulrich
• Kopecki Josef
• Breuer David
• Bosch Gmbh Robert

Inventors

• Schmitt Joachim
• Krause Peter
• Bittner Ulrich
• Kopecki Josef
• Breuer David

Classifications

• F04B1/2064

  Housings · CPC title

• F04B1/2078

  Swash plates · CPC title

• F04B53/003

  by damping supports · CPC title

• F04B1/128 Primary

  Driving means · CPC title

• F04B39/0044

  with vibration damping supports · CPC title