DE102016202276B3 - Eccentric arrangement in particular for a pump of an ABS system and pump for the ABS system - Google Patents

Abstract

Radial piston pumps are used in vehicles, for example in ABS systems. The pumps have, in a known design, a drive shaft with an eccentric portion, on which a roller bearing is mounted, which rotates eccentrically in its entirety about the axis of rotation of the shaft. It is an object of the present invention to provide an eccentric arrangement with high reliability during operation and a corresponding pump. For this purpose, an eccentric arrangement 1 with a housing, with an eccentric shaft section 4 for eccentric rotation about a main axis of rotation H, the eccentric shaft section 4 provides or carries an inner race 9, with a rolling bearing device 7, wherein the rolling bearing device 7 is arranged on the eccentric shaft section 4 and an eccentric axis E defined, proposed, wherein the rolling bearing device 7 comprises a plurality of rolling elements 12 and an outer race means 8, wherein the outer race means 8 provides an outer race 10 for the rolling elements 12 and wherein the rolling elements 12 in a Wälzkörperraum 11 on the inner race 9 and on the outer race 10th unroll, with a support member 17 and a support surface 18 as a support partner, wherein the support member 17 rests on the support surface 18 moving, wherein the support partners together form an axial support of the eccentric shaft portion 4 on the housing 5 un d wherein one of the support partners is fixed to the housing and the other support partner is supported on the eccentric shaft section 4, wherein the support surface 16 is arranged fixed to the housing.

Description

The invention relates to an eccentric assembly comprising a housing having an eccentric shaft portion for eccentric rotation about a main axis of rotation, wherein the eccentric shaft portion provides or carries an inner race, with a rolling bearing device, wherein the rolling bearing device is arranged on the Exzenterwellenabschnitt and defines an eccentric axis, wherein the rolling bearing device comprises a plurality of rolling elements and an outer race means, wherein the outer race means provides an outer race for the rolling elements and wherein the rolling elements roll in a Wälzkörperraum on the inner race and on the outer race, with a support member and with a support surface as a support partner, wherein the support member rests on the support surface moving wherein the support partners together form an axial support of the eccentric shaft portion of the housing and wherein one of the support partners is fixed to the housing and the other support partner is supported on the eccentric shaft section. The invention also relates to a pump for an ABS system with this eccentric arrangement.

Such pumps are used in vehicles, for example in ABS systems and are based on a radial piston principle. The pumps have, in a known design, a drive shaft with an eccentric portion, on which a roller bearing is mounted, which rotates eccentrically in its entirety about the axis of rotation of the shaft. The pumps have piston cylinder arrangements for pumping a fluid, wherein the piston ends abut against an outer circumferential surface of the rolling bearing and are oscillated by the eccentric movement of the rolling bearing and thus the lateral surface of the rolling bearing.

Such a pump is in the document DE 102 41 306 A1 discloses this document is probably the closest prior art. On an eccentric portion of a shaft, a rolling bearing is mounted, which is formed by a needle sleeve in which a plurality of needles is arranged in a cage. The needle sleeve is closed at one axial end and forms with this axial end a contact surface for a ball, which is fixedly arranged in the housing of the pump, so that the needle sleeve can be supported in the eccentric movement of the ball. At the opposite axial end of the needle sleeve terminates in a board, which is arranged circumferentially to a passage opening for the eccentric portion. In the radial direction, piston ends of working pistons rest on the needle sleeve.

The DE 196 48 319 A1 shows a radial piston pump with a housing for receiving a pump piston and a pump drive, consisting of an electric motor, the drive shaft protrudes with a crank or eccentric pin in a housing opening, wherein the crank or eccentric preferably receives a rolling bearing on which the pump piston comes to rest ,

The DE 103 46 237 A1 shows a piston pump for conveying pressure medium in at least one vehicle brake, in a master cylinder, in a pressure fluid reservoir or in a pressure fluid reservoir of a regulated vehicle brake system.

The DE 10 2006 010 680 A1 shows a radial piston pump, comprising a crank mechanism with a plurality of roller bearings, in each case via a piston crown on a centrally and rotatably mounted eccentric supported pistons which are provided oscillatably displaceably guided in a housing.

The DE 103 00 774 A1 shows an eccentric bearing a rotating pump shaft of a radial piston pump, which are supported in a pump housing arranged pump plunger, wherein between an end face of the eccentrically offset shaft journal and the bottom of an axial roller bearing is arranged.

It is an object of the present invention to provide an eccentric arrangement with high reliability during operation and a corresponding pump. This object is achieved by an eccentric arrangement with the features of claim 1 and with a pump having the features of claim 7. Preferred or advantageous embodiments of the invention will become apparent from the dependent claims, the following description and the accompanying drawings.

The invention relates to an eccentric arrangement which is preferably suitable and / or designed for a pump. The pump is preferably suitable and / or designed to generate a hydraulic pressure in an ABS system of a vehicle.

The eccentric arrangement has an eccentric shaft section, wherein the eccentric shaft section is structurally designed such that it rotates eccentrically about a main axis of rotation. Preferably, the eccentric shaft portion is arranged eccentrically on a drive shaft, wherein the drive shaft defines the main axis of rotation by its rotation. Optionally, the drive shaft forms part of the eccentric arrangement. The eccentric shaft portion provides an inner race or carries a component with the inner race. Particularly preferably, the inner race on the base material of Exzenterwellenabschnitts arranged or formed by this.

The eccentric arrangement has a rolling bearing device, wherein the rolling bearing device is designed in particular as a radial roller bearing device. The rolling bearing device is arranged on the eccentric shaft section and defines with its axis of rotation an eccentric axis. The eccentric axis and the main axis of rotation are offset parallel to each other, wherein the eccentric axis rotates eccentrically in operation about the main axis of rotation.

The rolling bearing device has a plurality of rolling elements and an outer raceway device, wherein the rolling elements are arranged in a Wälzkörperraum in the outer raceway means circumferentially about the eccentric axis. The rolling elements are designed in particular as rollers, in particular as needle rollers. In the configuration as needle rollers, these have an axial longitudinal extension which is greater than three times the diameter. Preferably, the rolling elements, in particular the rollers, in particular the needle rollers, are arranged in a cage and particularly preferably cage-guided. The outer race means provides an outer race for the rolling elements. The outer race means is preferably formed rotationally symmetrical to the eccentric axis. The rolling elements roll, in particular rolling, on the inner raceway and on the outer raceway. The inner raceway and / or the outer raceway are preferably formed as straight cylinder jacket surfaces, which are arranged coaxially and / or concentrically with the eccentric axis.

The eccentric arrangement has a support element and a support surface, wherein the support element and the support surface each form a support partner. The support element is located on the support surface moving.

It may be provided that the eccentric arrangement is designed so that the support member is slid as a sliding element during operation exclusively sliding on the support surface as a sliding surface or that the support element rolls as a sliding rolling element on the support surface as a sliding rolling surface and at the same time slides , Furthermore, it can be provided that the support element is designed as a rolling element, which rolls exclusively on the support surface as a rolling surface.

The support surface is preferably flat, in particular planar. The support partners together form an axial support of the eccentric shaft portion of the housing. In particular, these form a transmission link or a transmission chain for transmitting compressive forces between the eccentric shaft section and the housing in an axial direction to the main axis of rotation and / or the eccentric axis. It is envisaged that the one support partner is supported on the eccentric shaft portion for transmitting axial compressive forces and the other support partner is arranged fixed to the housing.

In the context of the invention is claimed that the support surface is arranged fixed to the housing as the support partner. By this configuration it is achieved that the loads which are introduced from the support element in the support surface, can be derived via the housing and in this way do not burden the moving parts of the eccentric assembly. Comparing this embodiment with the known prior art, it is found that in the already known construction there is the danger that the support surface is pivoted due to the pressure load by the support member in a plane perpendicular to the main axis of rotation and / or to the eccentric axis and in this way introduces stresses into the rolling bearing. In contrast, the support surface is housed fixed to the housing and thus can be supported more stable. This reduces the load on the rolling bearing, reduces its wear and thus improves the reliability of the eccentric assembly in operation.

According to the invention, the outer raceway device has a receptacle for the support element.

In a very cost-effective production, the outer race means is formed as a sleeve with a sleeve bottom. The sleeve is particularly preferably produced by forming technology and in particular formed as a deep-drawn sleeve.

It is particularly preferred that the support element is supported in the radial direction by the outer raceway device. The radial direction relates in particular to the eccentric axis. In particular, there is an interaction between the support element and the outer raceway device. Firstly, the support member is held on the eccentric axis by the outer race means, so that tilting or displacement is minimized, on the other hand, the outer race means is held by the support member at the predetermined position and / or in the correct position.

In a preferred embodiment of the invention, the outer race means is preferably held in the axial direction of the eccentric axis and that towards the support surface by the support member preferably form-fitting manner. Thus, it is also ensured by the support member that the outer race means can not migrate in the direction of the support surface, but is secured in the correct position. By the axial positioning or guidance of the outer race means by the support member thus also the life of the rolling bearing device and thus the reliability of the eccentric assembly is increased.

It is particularly preferred that the support element is formed as a ball. In this embodiment, it is further particularly preferred that the support surface is flat or flat.

The ball may be rotatably received in the outer race means. Alternatively, the ball is rotatably and / or rollably supported in the outer race means, so that the ball as the support member can rotate during rolling on the support surface with low friction in the outer race means.

A contact surface, in particular end face on the eccentric shaft section, on which the ball is supported as a support element, may be flat. Alternatively, this surface carries a centering, such as a recess, to define the ball as a support member in position.

In principle it can be provided that the support surface is formed by the base material of the housing and thus is formed only as a preferably planar portion of the housing. In a preferred embodiment of the invention, the eccentric arrangement on a support plate, wherein the support plate is stationary in or arranged to the housing and forms the support surface. This embodiment has the advantage that the housing can be made of a cost-effective material, such as an aluminum alloy, and by the inserted support plate, which is made for example of steel, nevertheless sufficient abrasion resistance and mechanical stability can be achieved. The support plate may be formed as a plate-shaped component. Alternatively, the support plate is a portion of a more complex component, which is arranged fixed to the housing.

Particularly preferably, the support element can be arranged captively in the receptacle and / or is arranged captively in the receptacle. Such a receptacle facilitates the installation of the eccentric arrangement, since during assembly, the support element, in particular the ball, can not be accidentally lost.

In a particularly preferred implementation, the receptacle is designed as a snap-in receptacle into which the support element, in particular the ball, can be snapped. In the snap-on receptacle, the support element, in particular the ball, is preferably held positively and / or non-positively.

Optionally, it is possible that the receptacle is designed as a bearing, in particular as a plain bearing and / or Wälzkörperlagerung, in particular ball bearing, for the support element, in particular for the ball.

It can be provided that the receptacle, in particular the snap-in receptacle, is introduced into the sleeve base by a process sequence of forming and separating. Particularly preferably, the sleeve bottom has a particular circular passage opening, which has a diameter in the direction of the eccentric shaft portion, which is smaller than the diameter of the support element, in particular the ball, and further comprises a concave receiving structure which the support element, in particular the ball, form-fitting receives.

Another object of the invention is a pump for an ABS system, wherein the pump has an eccentric arrangement according to one of the preceding claims, wherein the eccentric shaft portion operatively connected to a drive shaft of the pump, in particular rotatably coupled, and the pump has at least one piston-cylinder unit, wherein a piston end of the piston is supported on an outer circumferential surface of the rolling bearing device, so that a rotational movement of the input shaft via the eccentric shaft portion and the rolling bearing device is converted into an oscillating movement of the piston.

Further features, advantages and effects of the invention will become apparent from the following description of a preferred embodiment of the invention and the accompanying figures. Showing:

1 a schematic longitudinal sectional view of a section of a pump with an eccentric arrangement as a first embodiment of the invention;

2 and 3 in each case a schematic longitudinal section as a partial enlargement of the receptacle of the outer raceway device.

The 1 shows a schematic longitudinal sectional view of an extenter arrangement 1 as a detail of a pump 22 for an ABS system. The pump 1 is designed as a radial piston pump and sets over an input shaft 2 introduced rotational movement in an oscillating movement of two piston rods or plungers in this example 3 , The oscillating movement is in a radial direction to a main axis of rotation H, which is due to the rotation of the input shaft 2 is defined.

On the input shaft 2 is an eccentric shaft section 4 arranged and in particular rotationally fixed to the input shaft 2 connected or forms an end portion of the input shaft 2 , The eccentric shaft section 4 is formed in a cross section perpendicular to the main axis of rotation H circular. The eccentric shaft section 4 defines an eccentric axis E, wherein the eccentric axis E offset parallel to the main axis of rotation H of the input shaft 2 is arranged. The input shaft 2 is in a housing 5 the pump 1 via a storage facility 6 , which is designed as a ball bearing, rotatably mounted. On the eccentric shaft section 4 is a rolling bearing device 7 arranged.

The rolling bearing device 7 has an outer raceway device 8th which is formed as a sleeve. The eccentric shaft section 4 represents an inner career 9 and the outer raceway device 8th an outer career 10 ready. Inner raceway 9 and outer career 10 are coaxial and concentric with each other and each realized as a straight cylindrical surface. Inner raceway 9 and outer career 10 are also aligned coaxially and / or concentrically with the eccentric axis E. In the outer raceway facility 8th in a Wälzkörperraum 11 are a plurality of rolling elements 12 arranged, which are designed as rollers, in particular cylindrical rollers, and which on the inner raceway 9 and the outside career 10 roll off, in particular roll off. The plungers 3 lie with a free end side on an outer lateral surface 13 the outer raceway device 8th at.

The trained as a sleeve outer raceway device 8th has a sleeve bottom 14 on which the outer raceway device 8th terminates on one axial side. Between a front side 15 of the eccentric shaft section 4 and a support plate 16 which are in the housing 5 is arranged, is a support element in the form of a ball 17 arranged, wherein the eccentric shaft section 4 with his front side 15 over the ball on the support plate 16 supported. More specifically, the ball forms a support element 17 , which is attached to a support surface 18 the support plate 16 supported as another support partner. The support surface 18 and the front side are aligned parallel to each other. The case bottom 14 has a passage opening 19 on, in which the ball is arranged. The ball and / or the passage opening 19 is arranged centrally to the eccentric axis E. In the radial direction, the support element is supported 17 , formed as a ball, on the outer raceway device 8th off, so that the outer raceway facility 8th and the support element 17 , formed as a ball, center each other centrally to the eccentric axis E. For example, the housing 5 formed of an aluminum alloy and the support plate 16 is made of a steel material, so that the support is designed wear-resistant to wear.

In the 2 and 3 is a section of the case bottom 14 in the area of the passage opening 19 once with support element 17 ( 2 ) and once without a support element 17 ( 3 ). It can be seen that the passage opening 19 a recording 20 for the support element in the form of a sphere 17 forms. As can be seen in particular from the 3 gives, is the through hole 19 on one of the eccentric shaft section 4 side reduced to a diameter D1, wherein the diameter D1 is smaller than the diameter D0 of the ball. In a central area, the recording 20 a diameter D2 or diameter course, which is adapted to the diameter D0 of the ball, that this is held snapping. In other words, the ball can be in the receptacle 20 be snapped and held captive there. The diameter D1 is designed so that the ball does not pass through the bottom of the case 14 can be pushed through or that the case bottom 14 over the ball in the direction of the arrows 21 to the support surface 18 can be deducted. This will make the case bottom 14 and thus the outer raceway facility 8th by the ball positively against a displacement in the direction of the support plate 16 prevented.

The recording 20 can be formed in axial plan view, for example, rotationally symmetrical or by a plurality of tongues which extend in the radial direction, be formed.

LIST OF REFERENCE NUMBERS

1

eccentric

2

input shaft

3

plunger

4

eccentric shaft

5

casing

6

Storage facility

7

roller bearing device

8th

Outer race means

9

Inner raceway

10

Outer race

11

anti-friction

12

rolling elements

13

lateral surface

14

sleeve base

15

front

16

support plate

17

support element

18

support surface

19

Through opening

20

admission

21

arrows

D0, D1, D2

diameter

e

eccentric

H

Main axis of rotation

Claims (7)

Eccentric arrangement ( 1 ) with a housing, with an eccentric shaft section ( 4 ) for eccentric rotation about a main axis of rotation (H), wherein the eccentric shaft portion ( 4 ) an inner raceway ( 9 ) provides or carries with a rolling bearing device ( 7 ), wherein the rolling bearing device ( 7 ) on the eccentric shaft section ( 4 ) and defines an eccentric axis (E), wherein the rolling bearing device ( 7 ) a plurality of rolling elements ( 12 ) and an outer raceway device ( 8th ), wherein the outer raceway device ( 8th ) an outer career ( 10 ) for the rolling elements ( 12 ) and wherein the rolling elements ( 12 ) in a Wälzkörperraum ( 11 ) on the inner raceway ( 9 ) and on the outer track ( 10 ), with a support element ( 17 ) and with a support surface ( 18 ) as a support partner, wherein the support element ( 17 ) on the support surface ( 18 Moving rests, wherein the support partners together an axial support of the Exzenterwellenabschnitts ( 4 ) on the housing ( 5 ) and wherein one of the support partners is fixed to the housing and the other support partner is arranged on the eccentric shaft section ( 4 ), characterized in that the support surface ( 18 ) is arranged fixed to the housing, wherein the outer raceway device ( 8th ) a recording ( 20 ) for the support element ( 17 ), wherein the outer raceway device ( 8th ) is formed as a sleeve and the receptacle ( 20 ) is molded into the sleeve. Eccentric arrangement ( 1 ) according to claim 1, characterized in that the supporting element ( 17 ) in the radial direction through the outer raceway device ( 8th ) is supported. Eccentric arrangement ( 1 ) according to one of the preceding claims, characterized in that the outer raceway device ( 8th ) in the axial direction to the support surface ( 18 ) by the support element ( 17 ) is held. Eccentric arrangement ( 1 ) according to one of the preceding claims, characterized in that the supporting element ( 17 ) is formed as a ball. Eccentric arrangement ( 1 ) according to one of the preceding claims, characterized in that the eccentric arrangement ( 1 ) a support plate ( 16 ), wherein the support plate ( 16 ) stationary in or to the housing ( 5 ) is arranged and the support surface ( 18 ). Eccentric arrangement ( 1 ) according to claim 1, characterized in that the receptacle ( 20 ) is formed as a snap-receiving. Pump ( 22 ) for an ABS system, characterized by an eccentric arrangement ( 1 ) according to any one of the preceding claims.

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