DE102005003987B4 - Play free radial ball bearing - Google Patents

Abstract

Backlash-free radial ball bearing (1) with a two-part bearing inner ring (3) between which and a concentrically arranged bearing outer ring (2) on associated raceways (3.4, 2.2) about a bearing axis (4) bearing balls (6) roll, two in the axial direction by a Gap (7) spaced apart inner ring parts (3.1) from one at both ends with a radially outwardly directed board (8.1, 8.2) provided with inner sleeve (8) are received and at least one of the two inner ring parts (3.1) by a spring element in the axial direction Pressure is applied, so that the bearing balls (6) are held under prestress, characterized in that a raceway (2.2) of the bearing outer ring (2) is hollow spherically formed such that the radius of curvature (R) on the bearing axis (4) and that the two inner ring parts (3.1) by a radial gap (9) spaced from the inner sleeve (8) are arranged.

Description

Field of application of the invention

The invention relates to a backlash-free radial ball bearing with a two-part bearing inner ring, between which and a concentrically arranged bearing outer ring on associated raceways roll about a bearing axis bearing balls, wherein two axially spaced apart by a gap inner ring parts of a at both ends with a radially outwardly directed board provided inner sleeve are received and at least one of the two inner ring parts is acted upon by a spring element in the axial direction with pressure, so that the bearing balls are held under prestress.

Background of the invention

Such a generically trained backlash radial ball bearing is from the DE 198 07 514 A1 previously known. Like the one in 1 can be removed, rolling in a cage guided bearing balls on an outer race of a ball groove of a bearing outer ring and on an inner race of a concentrically arranged inner ring from. The inner race is formed jointly by a first and a second bearing ring part, which are spaced apart from each other in the axial direction and are received by a non-cutting shaped inner sleeve. This has radially outwardly directed ribs, wherein one board embraces an end face of the first bearing ring part, while the other board comprises a corrugated spring, which adjoins in the axial direction on the second ring part. This corrugated spring now ensures the preload in the ball bearing by pressing the second movable bearing ring part against the bearing balls and thus against the first fixed bearing ring part. In axial section is further seen that the bearing ball is more curved than the profile of the concave ball groove, ie, that the radius of the bearing ball is smaller than the radius of the ball groove. If now the bearing axis is tilted by a certain amount, the contact point between outer race and bearing ball will wander, so that a malposition of the shaft can be compensated.

The disadvantage here is that such a radial ball bearing on the one hand has a relatively small pivot angle, so that only small misalignments can be compensated, and on the other hand a radial impact, that is, in which the part to be stored is moved in the radial direction, can not compensate.

In this context, the skilled person more radial ball bearings are known, which are indeed free of play, but can not compensate for radial shocks. Such radial ball bearings have a two-part bearing outer ring, which is acted upon in the axial direction by a spring element with pressure. In the DE41 14 643A1 and in the DE 42 24 992 A1 such bearings are described above.

Summary of the invention

Based on the disadvantages of the known prior art, the invention is therefore an object of the invention to improve a generic radial ball bearing so that on the one hand its pivotability is increased and that on the other hand radial shocks are compensated.

According to the invention, this object is achieved according to the characterizing part of claim 1 in conjunction with the preamble thereof, that a raceway of the bearing outer ring is hollow spherically formed such that the radius of curvature lies on the bearing axis and arranged the two inner ring parts spaced by a radial gap of the inner sleeve are.

Due to the hollow-spherical design of the raceway of the bearing outer ring and the position of its radius of curvature on the track is achieved that a larger swing angle can be realized and thus larger misalignments of the part to be stored are compensated. Compliance with the radial gap between the two bearing inner rings and the inner sleeve ensures that radial impacts of the part to be supported, that is, their displacement in the direction of the outer ring are possible, this impact is mitigated by the arranged in the bearing elastic Einlageringe.

Further advantageous embodiments of the invention are described in the subclaims.

Thus, it is provided according to claim 2 that the radial gap is greater than the radial impact of a stored part. This ensures that the radial impact is always cushioned, so that no striking of the inner sleeve at the two bearing rings is possible.

According to an additional feature according to claim 3, both bearing rings should be formed as thin-walled Spanlosteile. These can be produced in a simple manner in a variety of shape and size variants.

According to a further additional feature of the invention according to claim 4 it is provided that the bearing outer ring is continued in the direction of the hollow spherical track in both directions, each with an extension whose outer circumferential surface is cylindrical. In this way it is ensured that the bearing outer ring, despite its hollow spherical outer raceway can be pressed easily into a housing construction.

It is apparent from claim 5, that the inner ring parts are angularly designed such that an axially and a radially extending part between them each include a track for the bearing balls. Such angle rings are easily manufactured by chipless process in a variety of variations and dimensions.

According to another additional feature according to claim 6, the spring element should be formed by an elastic insert ring, which is arranged on both sides between the inner sleeve and the inner ring part. The advantage of the two-sided arrangement is in particular due to the fact that the radial impact can be cushioned over the entire bearing width.

From claim 7 shows that the raceways of the inner ring parts should be shaped so that the radial bearing is designed as a three-point ball bearing. This three-sided or triple point contact ensures a particularly smooth running and low-friction bearing operation.

Finally, it is apparent from claim 8, that the bearing balls are guided in a cage.

The invention will be explained in more detail in the following embodiment.

list of figures

• The single FIGURE shows an axial half section through an inventively designed radial ball bearing.

Detailed description of the drawing

In the single figure is a play-free radial ball bearing 1 shown in longitudinal section, which consists of a non-cutting formed bearing outer ring 2 and a non-cutting formed bearing inner ring 3 exists, between those around the bearing axis 4 in a cage 5 guided bearing balls 6 roll off. The bearing outer ring has the middle part 2.1 with the hollow spherical track 2.2 on, on both sides in the axial direction, the extensions 2.3 connect, which in turn have a cylindrical outer circumferential surface. In this way it is ensured that the bearing outer ring 2 can be easily fixed in a receiving bore of a connecting construction via its extensions 2.3 arranged on both sides.

The bearing inner ring 3 is in two parts designed such that two angular inner ring parts 3.1 through an axial gap 7 spaced apart from each other. Both inner ring parts 3.1 have a radial and an axial leg 3.2 , 3.3, who each have a career between them 3.4 for the bearing balls 6 lock in. Also belongs to the radial ball bearing 1 the inner sleeve 8th , which at both ends with a radially outward directed board 8.1 . 8.2 is provided, the board 8.1 in its cross-section thin than the board 8.2 is. The left side board 8.2 protrudes in the radial direction to the axial leg 3.3 of the inner ring part 3.1 while the right-hand side board 8.1 is shortened in its radial extent. The angular inner ring parts 3.1 are with her thigh 3.2 around the radial gap 9 spaced from the inner sleeve 8th arranged. Finally belongs to the radial warehouse 1 one elastic insert ring each 10 on the one hand from the inner ring parts 3.1 and on the other hand of the inner sleeve 8th with their shelves 8.1 . 8.2 are enclosed. These elastic inserts 10 act as a spring element and act on the inner ring parts 3.1 both in the axial and in the radial direction.

Will now be the bearing axis 4 , as shown in the drawing, tilted by the angle α, so the point of contact 11 between bearing ball 6 and hollow spherical track 2.2 shift to the left, so that a malposition of a stored part in both directions can be compensated. In order to realize a larger pivot angle α, it is necessary that, as also shown in the figure, the radius of curvature R the hollow spherical outer raceway 2.2 in the middle of the bearing axis 4 lies.

A radial impact of a stored part is compensated by the fact that the part to be stored, including the inner sleeve 8th outward under compression of the two elastic insert rings 10 is moved. In this case, the bearing should be adjusted so that under all operating conditions, even with a large radial impact, always a distance between the bottom of the inner sleeve 8th and the two radial legs 3.2 the inner ring parts 3.1 is guaranteed.

The bearing described above can be used in particular advantageously as a steering bearing at low speeds, the bearing outer ring 2 pressed into an unillustrated steering tube and the inner sleeve 8th is in operative connection with a steering spindle, also not shown. The advantages are that on the one hand the steering shaft is always biased and on the other hand their manufacturing inaccuracies are compensated.

LIST OF REFERENCE NUMBERS

1

clearance-free rolling bearing

2

Bearing outer ring

2.1

midsection

2.2

hollow spherical track

2.3

renewal

3

Bearing inner ring

3.1

Inner ring member

3.2

radial leg

3.3

axial leg

3.4

career

4

bearing axle

5

Cage

6

bearing ball

7

axial gap

8th

inner sleeve

8.1

shelf

8.2

shelf

9

radial gap

10

elastic insert ring

11

Point

R

radius of curvature

Claims (8)

Backlash-free radial ball bearing (1) with a two-part bearing inner ring (3), between which and a concentrically arranged bearing outer ring (2) on corresponding raceways (3.4, 2.2) about a bearing axis (4) rolling bearing balls (6), wherein two in the axial direction by a Gap (7) spaced apart inner ring parts (3.1) from one at both ends with a radially outwardly directed board (8.1, 8.2) provided with inner sleeve (8) are received and at least one of the two inner ring parts (3.1) by a spring element in the axial direction Pressure is applied, so that the bearing balls (6) are held under prestress, characterized in that a raceway (2.2) of the bearing outer ring (2) is hollow spherically formed such that its radius of curvature (R) on the bearing axis (4) and that the two inner ring parts (3.1) by a radial gap (9) spaced from the inner sleeve (8) are arranged. Radial ball bearing (1) to Claim 1 , characterized in that the radial gap (9) is greater than a radial impact of a stored part. Radial ball bearing (1) to Claim 1 , characterized in that both bearing rings (2, 3) are produced as thin-walled chip-free parts. Radial ball bearing (1) to Claim 1 , characterized in that the bearing outer ring (2) following the hollow spherical track (2.2) is continued in both axial directions by an extension (2.3) whose outer circumferential surface is cylindrical. Radial ball bearing (1) to Claim 1 , characterized in that the inner ring parts (3.1) are angularly formed such that an axially and a radially extending leg (3.3, 3.2) between them each include a raceway (3.4) for the bearing balls (6). Radial ball bearing (1) to Claim 1 , characterized in that the spring element by an elastic insert ring (10) is formed, which is arranged on both sides between the inner sleeve (8) and the inner ring part (3.1). Radial ball bearing (1) to Claim 1 , characterized in that the raceways (3.4) of the inner ring parts (3.1) are shaped so that a three-point ball bearing is formed. Radial ball bearing (1) to Claim 1 , characterized in that the bearing balls (6) are guided in a cage (5).

Images