DE102019112391A1 - Disassembly of tandem angular contact ball bearings - Google Patents

Abstract

The invention relates to a tandem angular contact ball bearing (1) with a one-piece inner ring (2) and a one-piece outer ring (3) and rolling elements (6, 7) designed as balls, which are attached to the shoulders (10, 11; 12, 13) of the bearing rings (2, 3) are supported, the rolling elements (6, 7) each being inserted in pockets of separate rolling element cages (8, 9) designed as window cages and the diameter of the rolling elements (6, 7) being the same or different and one from the inner ring (2), the rolling element cages (8, 9) and the rolling elements (6, 7) formed pre-assembly unit (14) is enclosed by a separating film (15), whereby the rolling elements (6, 7) when the tandem angular contact ball bearing (1) is dismantled are fixed to the inner ring (2).

Description

The invention relates to a tandem angular contact ball bearing with a one-piece inner ring and a one-piece outer ring and rolling elements designed as balls, which are supported on the shoulders of the bearing rings, the rolling elements being inserted in pockets of separate rolling element cages designed as window cages and the diameter of the rolling elements being the same or different is great.

There are different assembly concepts for tandem angular contact ball bearings, also known as double row angular contact ball bearings or tandem ball bearings (TBB), whereby in certain applications it is necessary to dismantle the preassembled tandem angular contact ball bearing. For this purpose, the inner ring and the ball races consisting of the rolling elements and the rolling element cages are pulled out of the outer ring. Due to the installation clearance of the rolling elements in the pockets of the rolling element cages designed as window cages, the spherical rolling elements can move radially outward. Associated with this, there may be a disadvantageous self-locking, jamming or catching of the rolling elements between the inner ring and the outer ring, which makes a desired disassembly or assembly of the tandem angular contact ball bearing difficult or impossible.

The DE 10 2008 063 958 A1 discloses a retaining ring which is used for preassembled roller bearings, in particular wheel bearings designed as angular contact ball bearings. In these rolling bearings, which are often already greased, the inner ring, the outer ring and the rolling elements are already fitted into one another. The retaining ring prevents axial displacement of the inner ring with respect to the outer ring during assembly or during transport of the preassembled roller bearing. A protective film assigned to the retaining ring prevents contaminants from entering the roller bearing until it is installed.

The DE 10 2010 023 356 A1 relates to large roller bearings in which protective films are arranged between the outer ring and the rolling elements during transport to the installation site. These foils serve to protect the rolling element raceways from loads that occur as a result of high Hertzian pressure of the rolling elements on the raceways as a result of changing loads during transport of the large roller bearing. In addition, the protective films prevent a displacement of the lubricating film between the rolling element raceways and the rolling elements.

The invention is based on the object of providing a tandem angular contact ball bearing which can be assembled and disassembled in a simplified manner by means of a simple and inexpensive measure.

This object is achieved by means of a tandem angular contact ball bearing constructed according to the features of patent claim 1. Advantageous configurations or embodiments are described in the dependent claims 2 to 5.

According to the invention it is provided that a pre-assembly unit of the tandem angular contact ball bearing, which is formed from the inner ring and the ball races consisting of the rolling element cages and the rolling elements, is enclosed by a separating film, whereby the rolling elements are fixed on one side of the inner ring when the tandem angular contact ball bearing is dismantled.

By this measure according to the invention, a radially outward movement of the rolling elements designed as balls is effectively prevented and consequently a disadvantageous jamming between the one-piece inner ring and the one-piece outer ring preventing dismantling of the tandem angular contact ball bearing. As a positive side effect, the separating film provides effective transport protection that prevents damage to the rolling elements and / or the raceways of the bearing rings. The separating film inserted between the outer ring and the preassembly unit advantageously simplifies dismantling, removal of the preassembly unit from the outer ring of the tandem angular contact ball bearing.

Due to the elasticity of the separating film, it can be used for all tandem angular contact ball bearings regardless of the structure. For example, for tandem angular contact ball bearings with ball and cage assemblies, the rolling elements of which have matching or different diameters, and for rolling element cages designed as window cages and made of plastic or a metallic material. By using the separating film, rolling element cages with a simple structure can advantageously be used without holding elements, which prevent the rolling elements from leaving the associated pockets of the rolling element cages during disassembly.

The separating film used according to the invention consequently offers the possibility of realizing a tandem angular contact ball bearing that can be safely dismantled by means of an inexpensive, easy-to-implement measure.

According to a preferred embodiment of the invention, a largely circular separating film is used, the diameter of which exceeds the outer dimension of the tandem angular contact ball bearing. This ensures that the separating film encloses all the ball bearings in the pre-assembly unit. Also for an alternative assembly where initially the separating film is inserted into the outer ring before the pre-assembly unit is inserted into the outer ring, a separating film according to the invention is adequately dimensioned. Furthermore, this design enables the separating film to be combined, as a result of which a sealing function is established for the pre-assembly unit, which is thus protected from the ingress of contamination. The edge of the separating film, which is advantageously designed with two layers on the outside, provides security against tearing when the tandem angular contact ball bearing is dismantled.

The separating film according to the invention is preferably made from an elastic, flexible plastic which is characterized by high tear resistance and at the same time is oil-resistant and insensitive to dirt particles. These properties ensure, on the one hand, good adaptation to the component structure of the pre-assembly unit and, on the other hand, sufficient strength that ensures the dismantling of the pre-assembly unit. Suitable plastics are, for example, polyethylene (PE), polypropylene (PP) or polyamide (PA). A film thickness of 0.5 millimeters, preferably less than 0.3 millimeters, is preferably provided for the separating film.

The tandem angular contact ball bearing according to the invention, which can be dismantled in a simplified manner by means of the separating film, can be used, for example, in a transmission or differential of a drive train of a motor vehicle or is intended for wheel bearings of vehicles.

• 1: ein Tandemschrägkugellager gemäß dem Stand der Technik;
• 2: eine aus Innenring und zwei Kugelkränzen bestehende Vormontageeinheit des Tandemschrägkugellagers;
• 3: einen Außenring des Tandemschrägkugellagers mit einer erfindungsgemäßen Trennfolie;
• 4: das Tandemschrägkugellager mit integrierter Trennfolie;
• 5: den Außenring sowie die demontierte, von der Trennfolie umschlossene Vormontageeinheit.

The invention is described and explained in more detail below with reference to five figures which relate to an exemplary embodiment according to the invention. However, the invention is not restricted to the exemplary embodiment shown in the figures. It shows:

• 1 : a tandem angular contact ball bearing according to the prior art;
• 2 : a pre-assembly unit of the tandem angular contact ball bearing consisting of an inner ring and two ball and cage assemblies;
• 3 : an outer ring of the tandem angular contact ball bearing with a separating film according to the invention;
• 4th : the tandem angular contact ball bearing with integrated separating film;
• 5 : the outer ring and the dismantled pre-assembly unit enclosed by the separating film.

In the 1 is a tandem angular contact ball bearing also known as a double row angular contact ball bearing 1 shown according to the prior art. The tandem angular contact ball bearing 1 consists of a one-piece inner ring 2 and a one-piece outer ring 3 , between which ball races on associated raceways 4th , 5 are arranged, the rolling elements designed as balls 6th , 7th as well as associated separate rolling element cages 8th , 9 include, the rolling elements 6th , 7th in as pockets (not shown) of the rolling element cages designed as window cages 8th , 9 are used. Both bearing rings 2 , 3 form shoulders 10 , 11 ; 12 , 13 on which the rolling elements 6th , 7th are supported and guided radially inside and radially outside. The design of the tandem angular contact ball bearing 1 provides that the diameter of the rolling elements 7th the corresponding diameter of the rolling elements 6th surpasses. Furthermore, the two ball rims 4th , 5 a different pitch circle radius and a different diameter of the raceways for the rolling elements 6th , 7th on.

The 2 to 5 illustrate further details of the invention, like reference numerals being used for corresponding components. The following descriptions are largely restricted to supplementary details of the invention.

From the 2 is one from the inner ring 2 and the two ball rings 4th , 5 existing pre-assembly unit 14th can be seen to complete the tandem angular contact ball bearing 1 in the outer ring 3 (shown in 3 ) can be used. In the 3 is in the outer ring 3 a release film according to the invention 15th inserted after the pre-assembly unit has been inserted 14th in the outer ring 3 this encloses the outside. An alternative to this is the pre-assembly unit 14th before inserting into the outer ring 3 with the release film 15th to envelop.

The representation according to 4th shows the tandem angular contact ball bearing 1 with integrated separating film 15th that with one side on a surface 16 , for example rests in a packaging and is thus preferably delivered by the manufacturer to the customer. The flexible, made of plastic and a circumferential, double-layered edge 17th having separating film 15th is put together, for example, the pre-assembly unit 14th to protect against the ingress of dirt.

In the 5 is the one from the outer ring 3 dismantled, from the release liner 15th enclosed pre-assembly unit 14th pictured. The release film 15th effectively prevents a radially outward movement of the rolling elements during disassembly in the direction of the arrow 6th , 7th . Thus there is jamming of the rolling elements 6th , 7th prevents the dismantling of the pre-assembly unit 14th from the outer ring 3 much simplified. Using the release film 15th A pre-assembly unit that can be safely handled, also referred to as a partial storage unit, is formed 14th , the by adding the outer ring 3 to the tandem angular contact ball bearing 1 can be completed.

List of reference symbols

1

Tandem angular contact ball bearings

2

Inner ring

3

Outer ring

4th

Ball ring

5

Ball ring

6

Rolling elements

7th

Rolling elements

8th

Rolling element cage

9

Rolling element cage

10

shoulder

11

shoulder

12

shoulder

13th

shoulder

14th

Pre-assembly unit

15th

Release film

16

Underground

17th

edge

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• DE 102008063958 A1 [0003]
• DE 102010023356 A1 [0004]

Claims (5)

Tandem angular contact ball bearings (1) with a one-piece inner ring (2) and a one-piece outer ring (3) and rolling elements (6, 7) designed as balls, which are supported on shoulders (10, 11; 12, 13) of the bearing rings (2, 3) , wherein the rolling elements (6, 7) are each inserted in pockets of separate rolling element cages (8, 9) designed as window cages and the diameter of the rolling elements (6, 7) are the same or different, characterized in that one from the inner ring (2), the rolling element cages (8, 9) and the rolling elements (6, 7) formed pre-assembly unit (14) is enclosed by a separating film (15), whereby the rolling elements (6, 7) when the tandem angular contact ball bearing (1) is dismantled are fixed to the inner ring (2). Tandem angular contact ball bearings (1) Claim 1 , characterized in that the largely circular, an outer contour of the tandem angular contact ball bearing (1) surpassing separating film (15) is used, the circumferential edge (17) of which is double-layered. Tandem angular contact ball bearing (1) according to one of the preceding claims, characterized in that a separating film (15) made of polyethylene (PE), polypropylene (PP) or polyamide (PA) is used. Tandem angular contact ball bearing (1) according to one of the preceding claims, characterized in that a film thickness of less than 0.5 millimeters, preferably less than 0.3 millimeters, is provided for the separating film (15). Tandem angular contact ball bearing (1) according to one of the preceding claims, characterized in that the separating film (15) is intended for a tandem angular contact ball bearing (1) which is used in a drive train of a motor vehicle.

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