DE102017128523B3 - ball-bearing - Google Patents

Abstract

The invention relates to a ball bearing (1), at least comprising a rotation axis (2), an outer ring (3), an inner ring (4) and a plurality of balls (5) arranged between the outer ring (3) and the inner ring (4). wherein an outer ball bearing raceway (6) is formed by at least one first outer bearing ring (7) extending along a circumferential direction (8), wherein the plurality of balls (5) extend beyond the at least one first outer bearing ring (7 ) on the outer ring (3), wherein the first outer bearing ring (7) consists of a metallic material and is designed slotted and wherein at least the outer ring (3) or the inner ring (4) consists of a plastic.

Description

The invention relates to a ball bearing, at least comprising a rotation axis, an outer ring, an inner ring and a plurality of balls, which are arranged between the outer ring and the inner ring. The ball bearing is used in particular for knobs in the interior of motor vehicles.

Such, provided in the interior of motor vehicles for operating interfaces between the vehicle and the vehicle occupant ball bearings should be particularly cost-effective, backlash-free, quiet and low-friction. Since only small loads act on the ball bearings, standard deep groove ball bearings are particularly oversized and too expensive.

The DE 39 39 279 C1 shows a rolling bearing as a radial or thrust bearing, in which the rolling elements roll on raceways, which are formed on each lying in a race bed races, which consist of at their ends, optionally in a narrow tolerance gap, crashed running wires and in bearing grooves on both sides of the bearing pitch are arranged, wherein in the bearing grooves between the races and the groove wall lining rings are radially and axially supported on the wall of the bearing grooves and provided on its side facing the races with the race beds.

The GB 2 250 064 A shows a wire ball bearing, in particular for steering column bearings, consisting of two inner running wires, which are supported on an inner ring with radially outward Borden and two outer running wires, which are supported in an outer ring with radially inwardly directed Borden and the rolling elements, wherein a running wire arranged axially displaceable and acted upon by a spring which is supported on a surface of a board and provided between a running wire and a board plate spring is biased so far in the axial direction, that the lateral surface of the plate spring on a surface of a between the lateral surface and the bore of the outer ring inserted elastic element is arranged fitting.

From the DE 10 2014 207 211 A1 is known a ball bearing for an interior for motor vehicles. Cage, balls, inner ring and outer ring can be made of a plastic.

On this basis, the present invention has the object, at least partially overcome the disadvantages discovered in the prior art and to propose a ball bearing, which forms a backlash-free rolling bearing and thereby meet the special requirements, such. As low load, low speed, cost, low friction, is fair. In particular, the ball bearing should be life-lubricated and encapsulated. The storage should preferably be carried out without play over a temperature range (from about -40 degrees Celsius to about 100 degrees Celsius).

This object is achieved with a ball bearing according to the features of the independent claim. Further advantageous embodiments of the invention are specified in the dependent formulated claims. The individually listed in the dependent formulated features can be combined in a technologically meaningful way and can define further embodiments of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, wherein further preferred embodiments of the invention are shown.

It is proposed a ball bearing, at least comprising a rotation axis, an outer ring, an inner ring and a plurality of balls which are arranged between the outer ring and the inner ring. An outer ball raceway is formed by at least one first outer race extending along a circumferential direction, the plurality of balls being supported by the at least one outer race on the outer race, wherein the first outer race is made of a metallic material and slotted and wherein at least the outer ring or the inner ring (preferably both) consists of a plastic.

In particular, the first outer bearing ring at a first contact point (or at first contact points) to the balls on a convex surface relative to each sphere. Alternatively, the surface can also be flat or concave.

The first outer bearing ring is made in particular of a wire. Preferably, the first outer bearing ring at least partially has a round, preferably a circular cross-section.

In particular, the first outer bearing ring is executed slotted, particularly preferably at an angle of less or more than 90 degrees (ie not just at an angle of 90 degrees) with respect to the circumferential direction slotted executed. The angled slot is advantageous for supporting the balls.

The convex surface at the first contact points to the balls allows the execution of the ball bearing with low friction torque.

A slotted design of the first outer bearing ring allows the arrangement of the first outer bearing ring with a bias against the balls, via a slot, an elastic expansion of the first outer bearing ring is made possible. The spaced apart by the slot ends of the first outer bearing ring are arranged in the ball bearing at a temperature of 20 degrees Celsius in particular at least 0.1 millimeters, preferably at least 0.2 millimeters, more preferably at least 0.4 millimeters, spaced from each other.

Preferably, at least the outer ring or the inner ring (particularly preferably both) consists of a plastic.

The balls are arranged along the circumferential direction, in particular at equal distances from each other.

The inner ring can be arranged in particular on a shaft or already forms the shaft.

In particular, at least one of the outer ring and the inner ring is made of a plastic (and is optionally designed as a two-component part) and has at least one integrated seal. The seal may be made of another material and / or have an elastically deformable shape.

In this case, two-component part means that the part (outer ring and / or inner ring) is made from two different materials arranged in different regions of the part and in one piece (eg by injection molding). The one material may have sufficient strength to accommodate the bearing forces in particular without deformation, the other material just has an elastic deformability to form a sealing surface with another component, so that an encapsulated arrangement of at least the balls in one after outside via the at least one seal closed housing, preferably life lubricated, is made possible.

In particular, an inner ball bearing raceway is formed by at least a first inner bearing ring extending along the circumferential direction, wherein the plurality of balls are supported on the inner ring via the at least one inner bearing ring.

The comments on the first outer bearing ring apply in particular in the same way for the first inner bearing ring (metallic material, slotted design, convex / even / concave surface, then at second contact points, etc.).

The first inner bearing ring may in particular have a concave surface with respect to the balls. In particular, the first inner bearing ring can be designed as a formed part, preferably made of metal.

According to the invention, the ball bearing has only a first row of balls, wherein the ball bearing has a second outer bearing ring which extends along the circumferential direction, wherein the balls are supported on the outer ring via the first outer bearing ring and the second outer bearing ring, wherein the outer bearing rings each made of a metallic material and are designed slotted.

In particular, the outer bearing rings at first contact points to the balls on a convex surface relative to each sphere.

The comments on the first outer bearing ring apply in particular equally for the second outer bearing ring.

According to the invention, the outer ring and the inner ring together with a cover form an outwardly closed housing at least for the balls (and cage and bearing rings if present), the balls being biased by an elastically deformable biasing element supporting the housing are arranged.

According to the invention, the ball bearing on a second outer bearing ring which forms an outer ball bearing raceway and extends along the circumferential direction, wherein the plurality of balls on the at least one second outer bearing ring on the outer ring are supported, the second outer bearing ring consists of a metallic material and slotted is executed; wherein the balls are arranged on one of the outer bearing rings on the biasing member and biased over the other outer bearing ring on the housing.

In particular, the second outer bearing ring at a first contact point to the balls has a convex surface opposite to each ball.

At least one of the (inner and / or outer) (preferably all) bearing rings is (are) metallic or made of a metal. In particular, at least one of the bearing rings (preferably all) is made of a wire. The metallic design of the bearing rings allows a permanently ensured support of the balls of the ball bearing.

The balls are in particular made of a metal or plastic, wherein a metallic coating of a plastic or a plastic coating of a metal is possible.

The balls can be accommodated in a cage, so that an arrangement of the balls along the circumferential direction is defined. The cage can also be made slotted to simplify the mounting of the balls.

The slotted execution of at least one bearing ring and / or the provision of an elastically deformable biasing element cause the possibly different thermal expansion coefficients of the different materials (plastic / metal) and also in relation to the metallic design larger tolerances of the components made of plastic only a small influence on the bias and thus have the friction torque.

The design of the plastic components allows cost-effective assembly and the formation of seals that protect the ball bearing from penetrating into the housing protection and moisture and retain the lubricant in the housing.

By way of precaution, it should be noted that the numerical terms used here ("first", "second",...) Primarily (only) serve to distinguish a plurality of similar objects, variables or processes, ie in particular no dependence and / or order of these objects, quantities or mandate processes to one another. If a dependency and / or order are required, this is explicitly stated here or it obviously results for the person skilled in the art when studying the concretely described embodiment.

• 1: eine erfindungsgemäße Ausführungsvariante eines Kugellagers in einer Seitenansicht im Schnitt.

The invention and the technical environment will be explained in more detail with reference to FIGS. It should be noted that the invention should not be limited by the embodiments shown. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and findings from the present description and / or figures. In particular, it should be noted that the figures and in particular the illustrated proportions are only schematic. The same reference numerals designate the same objects, so that explanations of other figures can be used if necessary. Show it:

• 1 : An embodiment of a ball bearing according to the invention in a side view in section.

The 1 shows an embodiment of a ball bearing according to the invention 1 in a side view in section. The ball bearing 1 includes a rotation axis 2 , an outer ring 3 , an inner ring 4 and a plurality of balls 5 between the outer ring 3 and inner ring 4 are arranged. The outer ring 3 and the inner ring 4 form together with a lid 20 an externally closed housing 21 for the balls 5 and for the first cage 23 and the bearing rings 7 . 13 . 15 , where the balls 5 about one on the case 21 supporting, elastically deformable biasing element 22 are arranged biased.

The ball bearing 1 indicates only a first row 14 of balls 5 on, with the ball bearing 1 a second outer bearing ring 15 which extends along the circumferential direction 8th extends, with the balls 5 over the first outer bearing ring 7 and the second outer race 15 on the outer ring 3 support, with the outer bearing rings 7 . 15 at first contact points 6 to the balls 5 one opposite each ball 5 convex surface 10 respectively.

The first inner bearing ring 13 is with one over the balls 5 concave surface 10 executed. The first inner bearing ring 13 forms an inner ball raceway 12 , where the balls are 5 over the first inner bearing ring 13 on the inner ring 4 support.

LIST OF REFERENCE NUMBERS

1

ball-bearing

2

axis of rotation

3

outer ring

4

inner ring

5

Bullet

6

outer ball bearing raceway

7

first outer bearing ring

8th

circumferentially

9

first contact point

10

convex surface

11

-

12

inner ball bearing raceway

13

first inner bearing ring

14

first row

15

second outer bearing ring

16

-

17

second contact point

18

-

19

-

20

cover

21

casing

22

biasing member

23

first cage

24

-

25

-

Claims (4)

Ball bearing (1), at least comprising a rotation axis (2), an outer ring (3), an inner ring (4) and a plurality of balls (5) which are arranged between the outer ring (3) and the inner ring (4), wherein an outer ball bearing raceway (6) is formed by at least one first outer bearing ring (7) which extends along a circumferential direction (8), wherein the plurality of balls (5) extend over the at least one first outer bearing ring (7) on the outer ring (7). 3), which forms an outer ball bearing raceway (6) and extends along the circumferential direction (8), wherein the first outer bearing ring (7) consists of a metallic material and is slotted and wherein at least the outer ring (3) or the inner ring (4) consists of a plastic, wherein the ball bearing (1) only a first row (14) of balls (5), wherein the ball bearing (1) has a second outer bearing ring (15) extending along the circumferential direction (8 ), wherein the balls (5) via the first outer bearing ring (7) and the second outer bearing ring (15) on the outer ring (3) are supported, wherein the outer ring (3) and the inner ring (4) together with a cover (20) a formed outwardly closed housing (21) at least for the balls (5), wherein the balls (5) via a on the housing (21) supporting, elastically deformable biasing member (22) are arranged biased, wherein the second outer bearing ring (15 ) is made of a metallic material and is slotted; the balls (5) being biased against the housing (21) via one of the outer bearing rings (7, 15) on the biasing element (22) and over the other outer bearing ring (15, 7) and the inner ball bearing raceway (12). is formed by a single inner bearing ring (13) extending along the circumferential direction (8). Ball bearing (1) to Claim 1 , wherein the first outer bearing ring (7) at a first contact point (9) to the balls (5) has a relative to each ball (5) convex surface (10). Ball bearing (1) according to one of the preceding claims, wherein at least one of the outer ring (3) and inner ring (4) consists of a plastic and has at least one integrally formed seal. Ball bearing (1) according to one of the preceding claims, wherein the plurality of balls (5) via an inner bearing ring (13) on the inner ring (4) are supported, wherein the inner bearing ring (13) consists of a metallic material and is designed slotted.

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