Hydrostatic positive displacement machine

Patent metadata

Field	Value
Publication number	US-10041350-B2
Application number	US-201514921492-A
Country	US
Kind code	B2
Filing date	Oct 23, 2015
Priority date	Oct 27, 2014
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A hydrostatic positive displacement machine has a cam ring for adjusting the displacement volume thereof. This cam ring is guided in translation by approximately diametrically arranged outer circumferential surface segments on associated inner surface segments of a housing of the positive displacement machine.

First claim

What is claimed is:

1. A hydrostatic positive displacement machine, comprising:
a housing;
a rotor mounted in the housing so as to be rotatable about an axis of rotation, said rotor being fitted with radially movable space dividers; and
a cam ring having an inner circumferential surface on which the space dividers are supported,
wherein an annular space is formed between the rotor and the cam ring, said annular space being subdivided by the space dividers into hydrostatic working spaces configured to revolve with the rotor and be brought alternately into pressure medium connection with a high pressure and a low pressure,
wherein the cam ring has approximately diametrically arranged outer circumferential surface segments configured to guide the cam ring in a straight line translation transversely to the axis of rotation on associated inner surface segments of the housing,
wherein at least one of the outer circumferential surface segments has a first surface portion directly opposite a second surface portion of an associated inner surface segment which does not mirror the second surface portion in a load-free mode of the positive displacement machine,
wherein the first surface portion is non-planar and the second surface portion is planar.

2. The positive displacement machine according to claim 1 , wherein a contact area of the second l surface portion with the first surface portion is approximately equal to the second surface portion in a loaded mode.

3. The positive displacement machine according to claim 1 , wherein a surface pressure between the at least one of the outer circumferential surface segments and the inner surface segment is distributed in a spatially uniform manner in a loaded mode.

4. The positive displacement machine according to claim 1 , wherein the first surface portion is produced by one of erosion and 3-D milling such that a surface pressure is distributed in a spatially uniform manner.

5. The positive displacement machine according to claim 1 , further comprising:
a low-pressure duct fixed in relation to the housing; and
a high-pressure duct fixed in relation to the housing,
wherein the low-pressure duct and the high-pressure duct open into said annular space, and
wherein the at least one of the outer circumferential surface segment is arranged adjacent to a mouth of the high-pressure duct and remote from a mouth of the low-pressure duct.

6. The positive displacement machine according to claim 1 , wherein cross sections of the at least one of the outer circumferential surface segment are one of cambered and convex transversely to the axis of rotation in a load-free mode.

7. The positive displacement machine according to claim 1 , wherein longitudinal sections of the at least one of the outer circumferential surface segment are hollow or concave along the axis of rotation in a load-free mode.

8. The positive displacement machine according to claim 1 , wherein a length of the at least one of the outer circumferential surface segment in a translatory direction is approximately equal to or greater than a length of a projection of the inner circumferential surface in a plane defined by the translatory direction.

9. The positive displacement machine according to claim 1 , wherein a hydrostatic relief field is provided between the at least one of the outer circumferential surface segment and the inner surface segment.

10. The positive displacement machine according to claim 1 , wherein a length of the at least one of the outer circumferential surface segment in a translatory direction is approximately equal to or greater than a length of a projection of the inner circumferential surface in a plane defined by the translatory direction.

11. A hydrostatic positive displacement machine, comprising:
a housing;
a rotor mounted in the housing so as to be rotatable about an axis of rotation, said rotor fitted with radially movable space dividers; and
a cam ring having an inner circumferential surface on which the space dividers are supported,
wherein an annular space is formed between the rotor and the cam ring, said annular space subdivided by the space dividers into hydrostatic working spaces configured to revolve with the rotor and be brought alternately into pressure medium connection with a high pressure and a low pressure,
wherein the cam ring has approximately diametrically arranged outer circumferential surface segments configured to guide the cam ring in translation transversely to the axis of rotation on associated inner surface segments of the housing,
wherein at least one of the outer circumferential surface segments has a non-planar surface directly opposite the associated inner surface segment in a load-free mode of the positive displacement machine,
wherein longitudinal sections of the at least one of the outer circumferential surface segment are hollow or concave along the axis of rotation in a load-free mode,
wherein the at least one of the outer circumferential surface segments has a first surface portion directly opposite a second surface portion of the associated inner surface segment which does not mirror the second surface portion of the associated inner surface segment in a load-free mode of the positive displacement machine, and
wherein a contact area of the second surface portion with the first surface portion is approximately equal to the second surface portion in a loaded mode.

12. The hydrostatic positive displacement machine of claim 11 , wherein the outer circumferential surface segments are configured to guide the cam ring in a straight line translation transversely to the axis of rotation on associated inner surface segments of the housing.

13. The positive displacement machine according to claim 11 , wherein a surface pressure between the at least one of the outer circumferential surface segments and the inner surface segment is distributed in a spatially uniform manner in a loaded mode.

14. The positive displacement machine according to claim 11 , wherein the at least one of the outer circumferential surface segments is produced by one of erosion and 3-D milling such that a surface pressure is distributed in a spatially uniform manner.

15. The positive displacement machine according to claim 11 , further comprising:
a low-pressure duct fixed in relation to the housing; and
a high-pressure duct fixed in relation to the housing,
wherein the low-pressure duct and the high-pressure duct open into the annular space, and
wherein the at least one of the outer circumferential surface segment is arranged adjacent to a mouth of the high-pressure duct and remote from a mouth of the low-pressure duct.

16. The positive displacement machine according to claim 11 , wherein cross sections of the at least one of the outer circumferential surface segment are one of cambered and convex transversely to the axis of rotation in a load-free mode.

17. The positive displacement machine according to claim 11 , wherein a hydrostatic relief field is provided between the at least one of the outer circumferential surface segment and the inner surface segment.

Assignees

• Bosch Gmbh Robert

Inventors

• Mohn Ulrich Gordon
• Erlenkeuser Heiko
• Buck Martin
• Scheerer Rene

Classifications

• F01C20/22 Primary

  by changing the eccentricity between cooperating members · CPC title

• F01C1/3441

  the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation · CPC title