DE102013211461A1 - Bearing of stepless gear box for e.g. truck, has outer bearing ring whose recess portion is extended in radially oriented side wall, and embracing shell that is spaced apart from a separate intermediate element of outer bearing ring - Google Patents

Abstract

The bearing (1) has an outer bearing ring (2) for acoustic decoupling. An embracing shell (3) is arranged radially outside of the outer bearing ring for covering the periphery of the outer bearing ring, and is provided with an axial portion (4). A recess portion (8) of the outer bearing ring is extended in a radially oriented side wall (5). The embracing shell is spaced apart from the separate intermediate element (9) of the outer bearing ring.

Description

The invention relates to a bearing with a bearing outer ring and a radially outside of the bearing outer ring arranged for acoustic decoupling, the bearing outer ring at least partially encompassing shell, which is at least partially disposed radially outside of the bearing outer ring and there has a bearing outer ring partially circumferentially covering axial portion in at least one essentially radially aligned side cheek merges, which extends into an end-side recess of the bearing outer ring.

From the state of the art, about the DE 103 07 842 A1 , Decoupling devices are already known for supporting a shaft on a base body, in particular a shaft of a conical-pulley belt transmission operating with a chain as a belt means. This decoupling device includes a formed with a circular cylindrical outer surface bearing outer ring, within which the shaft is mounted, and a rigidly connected to a base body surrounding the outer surface inner surface, wherein between the outer surface and the inner surface at least one radial wave spring is arranged, which under elastic deformation of a limited relative radial movement between the inner surface and the outer surface allows.

Adjacent state of the art is also from the DE 10 2004 015 215 A1 known. There, a conical pulley belt transmission with a chain acting as a looping means and a decoupling device for mounting a shaft on a base body is disclosed. This includes a formed with a circular cylindrical outer surface bearing outer ring, within which the shaft is mounted, and a rigid, connected to a body surrounding the outer surface inner surface, wherein between the outer surface and the inner surface at least one cam ring is arranged, the limited relative radial movement between the inner surface and the outer surface allows.

From these publications, variants are known which reveal in the installed state in the circumferential direction closed spring rings, which surround the bearing outer ring and viewed in the circumferential direction bearing areas and non-bearing areas between the spring ring and the bearing outer ring have, for. about a chosen structure. The side walls of the spring ring lie against the side surfaces of the outer ring.

As a variant, it is also known from these documents that the spring ring in the lateral surface has axially extending slots. There is then no support surface on the lateral surface in this variant. For paragraphs are provided in the side walls of the bearing outer ring, which are supported on the side walls of the spring ring.

Such decoupling devices are used in chain-belt CVT transmissions to reduce noise emissions.

Recently, in vehicles, such as cars, trucks or tractors, increasingly conical-pulley continuously variable transmission use. Such belt pulleys comprise two pairs of conical pulleys mounted on shafts spaced apart from each other, which are looped around by a belt which is frictionally engaged with the conical surfaces of the pulley pairs. By opposing change in the distance between the conical disk pairs, the ratio of the transmission can be changed continuously. As wrapping means, in particular in transmissions with which higher torques can be transmitted, for example. Torques in the range of 300 Nm and more, metallic chains used. Unfortunately, in previously used belt pulley belt transmissions, which are designed as continuously variable transmissions, for example. As a CVT transmission, a relatively high structure-borne sound transmission, the result, what is to be improved.

Here is already the WO 03/072969 or the EP 1 908 972 B1 the step of providing a decoupling device, wherein on a Lageraußenringausgestaltung a sleeve ring is placed encompassing, which is located with radial corrugated springs in contact or with an axial surface of the bearing outer ring. In these two publications, however, is set to a frictional connection between a spring sleeve or a sleeve ring and the bearing outer ring.

Such a connection is necessary because due to the geometric design, the shell-like element used for decoupling must be shared for mounting in the warehouse. However, the two parts can not be reconnected after installation in the warehouse with simple means. Without a connection, however, the two sound-absorbing parts can fall off the camp. For this reason, a frictional connection is propagated in the two aforementioned publications in order to hold the two halves of the shell-like decoupling element on the bearing outer ring.

Those previously provided geometry contains slots to adjust the radial stiffness on the circumference, which extend into the shelves. These slots have previously been using wire or Laser cutting are introduced, resulting in high production costs. In addition, the diameters of the ribs must be ground to ensure the function at all. However, since several grinding tolerances add up here, the function can still be adversely affected.

It is the object of the present invention to allow mass production while avoiding long tolerance chains, but the cost should be kept low. Also, the friction occurring throughout the system should be reduced. Nevertheless, high radial stiffnesses should be achievable.

This object is achieved in that the shell is spaced by a separate intermediate element of the bearing outer ring.

The support surface is displaced from the shelves to the inner diameter of the acoustic decoupling element. Between the shell and the bearing outer ring is then the intermediate element, which can also be referred to as an intermediate component, via which the acoustic decoupling element, in particular the shell, is mounted. This new design has the advantage that the friction between the shell and the bearing outer ring is reduced by the intermediate element. As a result, compression is possible for small to very small vibration paths and phenomena similar to the "stick-slip effect" reduced or completely excluded.

Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

Thus, it is advantageous if the intermediate element with the shell, preferably on the inside, and the bearing outer ring, preferably on its side facing the shell, such as the lateral surface, is in abutment. This allows a compact and "rattle-free" storage can be achieved. Game inside the camp is thereby avoided.

It is also advantageous if formed on two axial ends of the shell as over-grip areas formed side cheeks, which are each in direct contact with an intermediate element. An axial fixation of the decoupling element to the bearing outer ring is thereby efficiently ensured.

Appropriately, it has also been found that the shell is designed as a spring ring made of preferably metallic material, such as steel, like a tire.

The costs can be reduced especially if the intermediate element is designed as a preferably continuous or simply interrupted ausgestalteter spring ring, such as in the manner of a wire ring. The internal friction can be kept particularly low, if the intermediate element is designed as a rolling element, for example. As a ball or roller, wherein the rolling elements can also be configured hollow.

It is also advantageous if several rolling elements are arranged one behind the other in the circumferential direction, since then the forces can be introduced uniformly.

The positioning of the individual elements to each other is simplified when the intermediate element is arranged in an annular groove in the lateral surface of the bearing outer ring for axial fixing.

An advantageous embodiment is also characterized in that the overlapping areas engage in the recesses via the intermediate elements radially inwardly away.

It is also advantageous if the bearing outer ring is in contact with rolling bearings that bear against a bearing inner race of the bearing. Alternatively, of course, the design in the context of a sliding bearing is conceivable.

It has been found to be especially expedient if two side cheeks protrude radially inwards from the main body of the shell at the axial ends of the shell between 85 ° and 95 °, preferably 90 °.

The invention also relates to a continuously variable transmission for a motor vehicle, with a bearing, as explained above as according to the invention.

The invention will be explained in more detail below with reference to two exemplary embodiments with the aid of a drawing. Show it:

1 a longitudinal section through a bearing, in the upper half of a first embodiment is visualized and in the lower half of a second embodiment of the invention is visualized, and

2 a detail of the second embodiment gem. 1 ,

The drawing is merely schematic in nature and is only for understanding the invention. The same elements are given the same reference numerals.

1 shows a bearing according to the invention 1 with a bearing outer ring 2 and a radially outside of the bearing outer ring 2 arranged for acoustic decoupling, the bearing outer ring 2 at least partially enclosing shell 3 , where the shell 3 acts as a decoupling element,.

The shell 3 is at least partially radially outside the bearing outer ring 2 arranged there and has a bearing outer ring there 2 partially peripherally covering axial section 4 on. This axial section 4 at least goes into a substantially radially aligned side cheek 5 above. The in the upper half of 1 shown first embodiment has at the front ends 6 of the decoupling element in each case a side wall 5 on, which also acts as an attack area 7 be designated.

The two side cheeks 5 engage in frontal recesses 8th of the bearing outer ring 2 ,

The shell 3 is via a separate intermediate element 9 from the bearing outer ring 2 spaced. There are at each corner 10 the Bowl 3 one intermediate element each 9 at.

The intermediate element 9 Can be used as a spring ring 11 be designed in the manner of a continuous or interrupted designed wire ring, or from a plurality of successively arranged in the circumferential direction of rolling elements 12 consist. In the lower half of the 1 , that is below a rotation axis 13 of the camp 13 , which specifies the axial direction, is a Ausgestaltungsart the intermediate element 9 with a large number of rolling elements 12 shown. In the upper half in 1 a first embodiment is shown and shown in the lower half of a second embodiment, wherein the two embodiments only differ in that the intermediate element 9 once as a spring ring 11 and once as a rolling element 12 or as a plurality of rolling elements 12 is designed.

The shell 3 is designed as a spring ring, in particular as a steel tire. The intermediate elements 9 are, as especially good in 2 shown in annular grooves 14 extending to the frontal recesses 8th of the bearing outer ring 2 extend, positioned.

In 1 and 2 can also be seen that Lagerwälzkörper 15 between the bearing outer ring 2 and a bearing inner ring 16 are positioned.

Between the shell 3 and the bearing outer ring 2 , in the area of the outer surface of the bearing outer ring 2 is a cavity 17 educated. The cavity 17 is radially within a waveform 18 the Bowl 3 present, which extends radially outward.

The shell 3 is manufactured by means of deep-drawing manufacturing techniques and has a radial stiffness of 150,000 N / mm, whereby also rigidities of 130,000 N / mm or 170,000 N / mm are practicable. Material cuts are made only in the area of the lateral surface, or on such cuts is omitted. The support of the ring can be done via rolling elements. An end stop will be via Höcker 19 at the bearing outer ring 2 realized.

These humps 19 are merely optional and can be modified so that they merge into each other in the axial direction without offset. The intermediate elements 9 but are outside the two humps 19 located, ie axially outside of it.

LIST OF REFERENCE NUMBERS

1

 camp

2

 Bearing outer ring

3

 Bowl

4

 axial

5

 side cheek

6

 frontal end

7

 The overlap area

8th

 frontal recess

9

 intermediate element

10

 Eck

11

 spring washer

12

 rolling elements

13

 axis of rotation

14

 ring groove

15

 bearing roller

16

 Bearing inner ring

17

 cavity

18

 waveform

19

 cusp

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 10307842 A1 [0002]
• DE 102004015215 A1 [0003]
• WO 03/072969 [0008]
• EP 1908972 B1 [0008]

Claims (10)

Camp ( 1 ) with a bearing outer ring ( 2 ) and a radially outside of the bearing outer ring ( 2 ) arranged for acoustic decoupling, the bearing outer ring ( 2 ) at least partially enclosing shell ( 3 ) which at least partially radially outside the bearing outer ring ( 2 ) and there is a bearing outer ring ( 2 ) peripherally covering axial section ( 4 ), which in at least one substantially radially aligned side cheek ( 5 ) merges into a frontal recess ( 8th ) of the bearing outer ring, characterized in that the shell ( 3 ) via a separate intermediate element ( 9 ) from the bearing outer ring ( 2 ) is spaced. Camp ( 1 ) according to claim 1, characterized in that the intermediate element ( 9 ) with the shell ( 3 ), preferably on the inside thereof, and the bearing outer ring ( 2 ), preferably on the shell ( 3 ) facing side, as the lateral surface, is in abutment. Camp ( 1 ) according to claim 1 or 2, characterized in that at two axial ends ( 6 ) the Bowl ( 3 ) as encroachment areas ( 7 ) trained side cheeks ( 5 ) are formed, each with an intermediate element ( 9 ) are in direct contact. Camp ( 1 ) according to one of claims 1 to 3, characterized in that the shell ( 3 ) is designed as a spring ring made of preferably metallic material, such as steel, like a tire. Camp ( 1 ) according to one of claims 1 to 4, characterized in that the intermediate element ( 9 ) as preferably continuous or interrupted ausgestalteter spring ring ( 11 ), like a wire ring, or as a rolling element ( 12 ) is trained. Camp ( 1 ) according to claim 5, characterized in that a plurality of rolling elements ( 12 ) are arranged in the circumferential direction one behind the other. Camp ( 1 ) according to one of claims 1 to 6, characterized in that the intermediate element ( 9 ) in an annular groove ( 14 ) in the lateral surface of the bearing outer ring ( 2 ) is arranged for axial fixation. Camp ( 1 ) according to one of claims 2 to 7, characterized in that the overlapping areas ( 7 ) into the recesses ( 8th ) via the intermediate elements ( 9 ) reach radially inwards. Camp ( 1 ) according to one of claims 1 to 8, characterized in that the bearing outer ring ( 2 ) with bearing rolling elements ( 15 ), which is located on a bearing inner ring ( 16 ) of the warehouse ( 1 ) Continuously variable transmission for a motor vehicle, with a bearing ( 1 ) according to any one of the preceding claims.

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