Roller bearing and hydrostatic axial piston machine of swashplate design with a roller bearing

Patent metadata

Field	Value
Publication number	US-10060478-B2
Application number	US-201615166839-A
Country	US
Kind code	B2
Filing date	May 27, 2016
Priority date	May 28, 2015
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

A rolling bearing includes rollers clamped between an inner raceway and an outer bearing shell. The outer bearing shell bears with its outer circumferential surface against an outer component which can be a housing of an axial piston machine. The inner raceway is either formed directly on an inner component, or it is formed on an inner bearing shell, which bears against the inner component. In order to permit tilting of the inner component, wherein the rollers remain in predetermined contact with the two raceways, at least one beveled contact region or a region reduced in another way is provided on the outer circumferential surface of the outer bearing shell.

First claim

What is claimed is:

1. A roller bearing, comprising:
two concentric circular-arc-shaped or circular-ring-shaped raceways, including an outer raceway formed on a circular-arc-shaped or circular-ring-shaped outer bearing shell; and
a plurality of rolling elements accommodated between the two raceways,
wherein an outer circumference of the outer bearing shell defines a first contact region shaped as a portion of a circumferential surface of a circular cylinder,
wherein the outer circumference defines a second contact region formed as a reduced region adjacent to the first contact region, the reduced region positioned obliquely with respect to the first contact region in such a way that a first edge is defined between the first and second contact regions,
wherein the outer circumference defines a third contact region adjacent to the first contact region and on an opposite side of the first contact region relative to the second contact region, the third contact region positioned obliquely relative to the first and second contact regions in such a way that a second edge is defined between the first and third contact regions, and
wherein the first contact region and the reduced region have a changing width along a portion of a length or circumference of the outer bearing shell.

2. The roller bearing according to claim 1 , wherein a value of an angle of inclination of the second contact region is not equal to a value of an angle of inclination of the third contact region.

3. The roller bearing according to claim 1 , wherein the rolling elements are circular-cylindrical.

4. The roller bearing according to claim 1 , wherein the rolling elements are spherical or barrel-shaped.

5. A bearing arrangement, comprising:
two roller bearings, each roller bearing including:
two concentric circular circular-arc-shaped or circular-ring-shaped raceways, including an outer raceway formed on an outer bearing shell and an inner raceway; and
a plurality of rolling elements accommodated between the two raceways, wherein:

an outer circumference of the outer bearing shell defines a first contact region shaped as a portion of a circumferential surface of a circular cylinder,
the outer circumference defines a second contact region formed as a reduced region adjacent to the first contact region, the reduced region positioned obliquely with respect to the first contact region in such a way that a first edge is defined between the first and second contact regions,
the outer circumference defines a third contact region adjacent to the first contact region and on an opposite side of the first contact region relative to the second contact region, the third contact region positioned obliquely relative to the first and second contact regions in such a way that a second edge is defined between the first and third contact regions,
the first contact region and the reduced region have a changing width along a portion of a length or circumference of the outer bearing shell,
the inner raceway and the outer bearing shell are circular-arc-shaped, and
the respective reduced regions are formed on mutually facing side edges of the two outing bearing shells.

6. An axial piston machine of swashplate design, comprising:
a housing;
a swashplate; and
a bearing arrangement, comprising:
two roller bearings, each roller bearing including:
two concentric circular circular-arc-shaped or circular-ring-shaped raceways, including an outer raceway formed on an outer bearing shell and an inner raceway; and
a plurality of rolling elements accommodated between the two raceways, wherein:

an outer circumference of the outer bearing shell defines a first contact region shaped as a portion of a circumferential surface of a circular cylinder,
the outer circumference defines a second contact region formed as a reduced region adjacent to the first contact region, the reduced region positioned obliquely with respect to the first contact region in such a way that a first edge is defined between the first and second contact regions,
the outer circumference defines a third contact region adjacent to the first contact region and on an opposite side of the first contact region relative to the second contact region, the third contact region positioned obliquely relative to the first and second contact regions in such a way that a second edge is defined between the first and third contact regions,
the first contact region and the reduced region have a changing width along a portion of a length or circumference of the outer bearing shell,
the inner raceway and the outer bearing shell are circular-arc-shaped,
the respective reduced regions are formed on mutually facing side edges of the two outing bearing shells,
the two inner raceways are formed on the swashplate, and
the two outer bearing shells bear against the housing.

7. The axial piston machine according to claim 6 , wherein:
a maximum angle of inclination (α 1max ) of the inner raceway, an angle of inclination (α 2 ) of the reduced region in relation to a contact surface of the housing, a length ( 1 1 ) of the rolling elements, and a projection ( 1 2 ) of a width of the reduced region onto the contact surface of the housing satisfy the following inequation:

α
2

>

arctan
⁢

tan
⁢

⁢

α

1
⁢

⁢
max

×

l
1

l
2

.

Assignees

• Bosch Gmbh Robert

Inventors

• Romer Achim
• Assfalg Christoph

Classifications

• F04B1/2014

  Details or component parts · CPC title

• F16C33/586 Primary

  outside the space between the races, e.g. end faces or bore of inner ring · CPC title

• F01B3/0073

  swash plate bearing means or driving or driven axis bearing means · CPC title

• F16C19/502

  with rolling elements in rows not forming a full circle · CPC title

• F04B1/2078

  Swash plates · CPC title