DE102011083292A1 - Disc-shaped axial stop for rolling bearing, has three equally high raised portions having convex or plane surfaces with circular or arc-shaped cross-sections, which are formed on contact surfaces of axial stop and roller bearing - Google Patents

Abstract

The axial stop (1) is outwardly fixed around a shaft (3) in radial direction. The axial stop and roller bearing (2) are provided with contact surfaces (1',2') in each end face. Three equally high raised portions (4) having convex or plane surfaces with circular or arc-shaped cross-sections are formed on the contact surfaces. The axial stop is made of metal and/or plastic. The axial stop is cohesively or positively or frictionally arranged on the shaft.

Description

The invention relates to an axial stop with the features of the preamble of patent claim 1.

A generic axial stop for a rolling bearing is for example from the German patent application DE 10 2006 054 406 A1 known. In this publication, a Hubübertragungsbauteil is proposed, in particular for a gas exchange valve drive or a fuel pump drive an internal combustion engine and a method for its preparation. The Hubübertragungsbauteil has a housing and a mounted in a receiving bore of the housing bearing pin and a rotatable on the bearing pin and optionally roller bearing roller, wherein the bearing pin is connected with radially expanded end-side ends form-fitting manner with the housing. Here, the bearing pin is to be through-hardened over its entire longitudinal extent with a core hardness of at least 58 HRC and its front ends to be widened by means of radial point rivets.

Such rolling bearings are used, for example, for eccentric shafts of variable-stroke valve trains. Described is such an eccentric shaft, for example, in the European patent specification EP 1 593 880 B1 , Such an eccentric shaft has, for example, four rolling bearings, wherein in each case left and right of the rolling bearing an axial stop is provided.

After mounting the eccentric shaft in a cylinder head, it may happen that the static friction between the axial stop and roller bearing is so large that the eccentric shaft must be driven by an electric motor having a high drive torque.

Object of the present invention is therefore to show an axial stop for a roller bearing, which has significantly reduced friction.

This object is solved by the features in the characterizing part of patent claim 1.

The inventive design, the friction between the axial stop and rolling bearing is significantly reduced, so that the electric motor requires less drive torque. Thus, advantageously, a smaller and less expensive electric motor can be used, which is lighter and smaller, so that in turn the package is more advantageous. Furthermore, the reduced friction moments lead to a somewhat lower fuel requirement for the internal combustion engine.

Advantageous developments of the invention are described in the subclaims.

Preferably, the axial stop surrounds the shaft according to claim 2 by 360 °.

According to claim 3, the axial stop can be arranged cohesively or positively or non-positively on the shaft.

Preferably, the raised areas have a round or arcuate cross-section.

Preferably, the axial stop is made of a metal and / or a plastic, such as aluminum or polypropylene or polyamide. A composite construction is possible, for. B. metallic core, overmoulded with plastic.

Preferably, the raised areas according to claim 6 have a spherical or a planar surface. Due to the convex surface, the friction between the axial stop and the roller bearing is significantly reduced again.

Due to the configuration according to claim 7, the assembly is considerably simplified, since the orientation of the axial stop during assembly no longer needs to be considered.

In the following the invention with reference to a preferred embodiment in two figures is explained in more detail.

1 shows a section through a bearing point of an eccentric shaft.

2 shows a three-dimensional view of an axial stop according to the invention.

The following apply in the 1 and 2 for same components the same reference numbers.

1 shows a section through a bearing of a shaft 3 with two eccentrics 7 , Cut components are shown hatched. Between the two eccentrics 7 is a rolling bearing 2 radially outward around the shaft 3 arranged, which axially on the shaft 3 is displaceable. The rolling bearing 2 has a cage 5 as well as rolling elements 6 on. In the present embodiment, it is in the rolling bearing 2 to a needle bearing, in other embodiments, it may also be a ball bearing, such. B. act a deep groove ball bearings. On both sides of the rolling bearing 2 is an inventive axial stop 1 intended. The rolling bearing 2 and the axial stop 1 each have a corresponding contact surface frontally 1' . 2 ' on. In the present embodiment, the axial stop encompasses 1 the wave 3 around 360 °. In further embodiments may For example, it may also be circular segments, which are the wave 3 encompass more than 180 °.

In the present embodiment, the axial stop 1 non-positively on the shaft 3 arranged. In other embodiments, the axial stop 1 also cohesively and / or positively on the shaft 3 to be ordered.

According to the invention, the contact surface 1' of the axial stop 1 in 1 unrecognizable at least three equally high raised areas 4 on. In various embodiments, the raised areas 4 have a round or arcuate cross-section. In a further embodiment, the contact surface 2 ' of the rolling bearing 2 at least three equally high raised areas 4 exhibit.

Particularly preferred is the axial stop 1 made of a metal and / or a plastic. This may be, for example, aluminum, steel or polypropylene or polyamide. A composite construction is possible, for. B. a metallic core, overmoulded with a plastic.

Particularly preferred are the raised areas 4 a spherical surface, which reduces the friction between rolling bearings 2 and axial stop 1 is minimized. In a somewhat less expensive embodiment, the raised areas 4 also have a flat surface.

Furthermore, the raised areas 4 on both contact surfaces 1' of the axial stop 1 or on both contact surfaces 2 ' of the rolling bearing 2 be arranged. As a result, the assembly is much easier, since the orientation of the axial stop during assembly no longer needs to be considered.

2 shows a plan view of a three-dimensional axial stop shown 1 , As in 2 is clearly visible, has the contact surface 1' of the axial stop 1 three equally high raised areas 4 on, which are executed plan in the present embodiment. As already shown above, these raised areas 4 be formed spherical. In other embodiments, it is also possible to have more than three raised areas 4 Provide a static certainty by 3 raised areas 4 already exists.

The inventive design, the friction between the axial stop and rolling bearing is significantly reduced, so that the electric motor requires less drive torque. Thus, advantageously, a smaller and less expensive electric motor can be used, which is lighter and smaller, so that in turn the package is more advantageous. Furthermore, the reduced friction moments lead to a somewhat lower fuel requirement for the internal combustion engine.

LIST OF REFERENCE NUMBERS

1

axial stop

1'

Contact surface axial stop

2

roller bearing

2 '

Contact surface rolling bearings

3

wave

4

raised area

5

Cage

6

rolling elements

7

eccentric

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006054406 A1 [0002]
• EP 1593880 B1 [0003]

Claims (7)

Axial stop ( 1 ) for a rolling bearing ( 2 ) which is axially displaceable radially about a shaft ( 3 ) is arranged, wherein the axial stop ( 1 ) is disc-shaped and radially outward around the shaft ( 3 ) is locatable, wherein the axial stop ( 1 ) and the rolling bearing ( 2 ) each end face a corresponding contact surface ( 1' . 2 ' ), characterized in that the contact surface ( 1' ) of the axial stop ( 1 ) and / or the contact surface ( 2 ' ) of the rolling bearing ( 2 ) at least three equally high raised areas ( 4 ) having. Axial stop according to claim 1, characterized in that the axial stop ( 1 ) the wave ( 3 ) encompasses 360 °. Axial stop according to claim 1 or 2, characterized in that the axial stop ( 1 ) cohesively or positively or positively on the shaft ( 3 ) is arranged. Axial stop according to one of the claims 1 to 3, characterized in that the raised areas ( 4 ) have a round or arcuate cross-section. Axial stop according to one of the claims 1 to 4, characterized in that the axial stop ( 1 ) is made of a metal and / or a plastic. Axial stop according to one of the claims 1 to 5, characterized in that the raised areas ( 4 ) have a crowned or planar surface. Axial stop according to one of the claims 1 to 7, characterized in that the raised areas ( 4 ) on both contact surfaces ( 1' ) of the axial stop ( 1 ) or on both contact surfaces ( 2 ' ) of the rolling bearing ( 2 ) are arranged.

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