DE102014210130A1 - Elastic covering device for partially covering a bearing ring in a coating bath and method for producing an elastic covering device - Google Patents

Abstract

The invention relates to an elastic covering device (1) for partially covering a bearing ring (12, 16) in a coating bath. The covering device (1) according to the invention has a supporting body (2) and a pressure body (6). The support body (2) has an axis of rotation (5). The pressure body (6) is arranged axially adjacent to the support body (2). Between the pressure body (6) and the support body (2) has a radial recess (7) is formed. The pressure body (6) is connected via a connecting web (8) with the support body (2) and extends in the unassembled state in the radial region of the radial cut (7) axially further away from the support body (2) than in the radial region of the connecting web (8) ,

Description

The invention relates to an elastic covering device for partially covering a bearing ring in a coating bath and to a method for producing such an elastic covering device.

When coating bearing rings in a coating bath, for example in a galvanic or chemical coating bath, it may be necessary to coat the bearing rings not only over the entire surface, but only partially. For example, it may be provided to keep the raceways and possibly further surfaces free of the coating, since otherwise the dimensional stability or the tribology or the surface quality is impaired.

A partial coating can be achieved by a full-surface coating and subsequent partial removal of the applied layer or by covering the surfaces which are not to be coated. The partial removal can be done for example by grinding and is sometimes very expensive. In addition, there is the risk that the surface under the coating in coating pretreatments such. B. pickling is damaged by pickling pits, hydrogen or alloy tripping. In partial covering, it is difficult to reliably prevent penetration of the bath liquid into the area of the covered areas.

The invention has for its object to achieve a reasonable cost, a partial coverage of a bearing ring in a coating bath and thereby reliably prevent a penetration of the bath medium in the covered area of the bearing ring.

This object is achieved by the feature combinations of the independent claims.

The elastic covering device according to the invention for partially covering a bearing ring in a coating bath has a supporting body and a pressure body. The support body has an axis of rotation. The pressure body is arranged axially adjacent to the support body. Between the contact pressure body and the support body, a radial incision is formed. The pressure body is connected via a connecting web with the support body and extends in the unassembled state in the radial region of the radial incision axially further away from the support body than in the radial region of the connecting web.

The invention has the advantage that upon immersion of a bearing ring on which the covering device according to the invention is mounted, a penetration of the bath medium in the covered area is reliably prevented in a treatment bath. It is that the support body can be relatively rigid and yet a high elasticity of the Andruckkörpers can be achieved is particularly advantageous. In this way, a tight fit of the cover on the bearing ring can be achieved without risking leaks in the area of the pressure body. Overall, a high sealing effect is achieved both in areas of the bearing ring on which the covering device according to the invention bears radially, as well as in areas where the covering device according to the invention is applied axially. Negative influences of the radial and the axially sealing components of the covering device according to the invention on each other are largely avoided.

The pressure body may be conically shaped on its side facing away from the support body axial end surface. As a result, a reliable system of the pressure body is achieved on board the bearing ring.

The radial incision may taper with depth. The pressure body may be formed integrally with the support body. This simplifies the production of the covering device according to the invention and has the further advantage that the covering device according to the invention is very durable. In addition, leaks in the area of seams are prevented.

The support body and the pressure body may extend over identical radial areas. This has manufacturing advantages.

The support body may be formed as a cylinder or as a hollow cylinder. The support body and the pressure body may be made of an elastomeric material. Elastomer material has a permanent elasticity, is available at low cost, easy to process at low temperature and sufficiently robust.

In the method according to the invention for producing an elastic cover device for partially covering a bearing ring in a coating bath, a base body made of an elastically yielding material having an axis of rotation is deep-frozen. Thereafter, a radial incision is formed in the base body and thereby divided the main body into a support body and a pressure body, which are arranged axially adjacent to one another and connected via a connecting web.

The inventive method has the advantage that greatly reduces the elastic properties of the body by the deep cooling and thus its handling is greatly facilitated.

The base body can be ground conically before or after formation of the radial cut in the region of at least one axial end face. The grinding is preferably carried out prior to the formation of the radial cut, since the base body in this variant has a higher stability during grinding.

In the method according to the invention for partially coating a bearing ring, the covering device according to the invention is attached to the bearing ring. Then the bearing ring including cover device is immersed in a coating bath. After a residence time, the bearing ring including covering device is removed from the coating bath and the covering device is removed from the bearing ring.

The fastening device can be mounted on the bearing ring so that the support body rests against a raceway of the bearing ring and the pressure body on an axial thrust surface of the bearing ring.

Furthermore, the fastening device can be mounted on the bearing ring so that the radial cut of the fastening device overlaps radially with the axial thrust surface of the bearing ring.

The invention will be explained below with reference to the embodiments illustrated in the drawings.

Show it:

1 a first embodiment of an inventively designed covering in a sectional view,

2 this in 1 illustrated first embodiment of the covering in the assembled state in a sectional view,

3 A second embodiment of the covering device according to the invention in a sectional view,

4 this in 3 illustrated second embodiment of the cover in the assembled state in a sectional view,

5 A third embodiment of the covering device according to the invention in a sectional view,

6 this in 5 illustrated third embodiment of the cover in the assembled state in a sectional view,

7 A fourth embodiment of the covering device according to the invention in a sectional view and

8th this in 7 illustrated fourth embodiment of the cover in the assembled state in a sectional view.

1 shows a first embodiment of an inventively designed covering 1 in section. The cover device 1 is made of an elastically deformable material, in particular of an elastomeric material. In the illustrated first embodiment, the cover device 1 a hollow cylindrical trained support body 2 with an inner lateral surface 3 and an outer circumferential surface 4 on. The supporting body 2 has an axis of rotation 5 on. In particular, the support body 2 with respect to the axis of rotation 5 formed rotationally symmetrical.

Relative to the axis of rotation 5 axially adjacent to the support body 2 is a pressure body 6 educated. Between the support body 2 and the pressure body 6 is a radial incision 7 educated. The radial cuts 7 extends from the outer surface 4 of the support body 2 radially inward to the inner surface 3 However, this does not quite reach, so that in the axial region of the radial incision 7 a connecting bridge 8th is formed, which the pressure body 6 with the support body 2 combines. The radial incision 7 has an inner side surface 9 and an outer side surface 10 on. The inner side surface 9 is the support body 2 facing and extending from the outer surface 4 of the support body 2 to the connecting bridge 8th , The outer side surface 10 is the pressure body 6 facing and extending from the radius of the outer surface 4 of the support body 2 to the connecting bridge 8th ,

In the illustrated first embodiment, the radial cuts 7 is formed as a keyway and tapers radially inward, ie, with increasing distance from the outer circumferential surface 4 of the support body 2 , Accordingly, the inner side surface approaches 9 and the outer side surface 10 the radial incision 7 with increasing depth to each other. The radial incision 7 is designed so that its inner side surface 9 a right angle with the outer surface 4 of the support body 2 formed. The outer side surface 10 the radial incision 7 forms with the outer lateral surface 4 of the support body 2 an angle of less than 90 °. In particular, the angle between the outer side surface 10 the radial incision 7 and the outer lateral surface 4 of the support body 2 about 80 °. The radial incision 7 can extend over the entire circumference of the outer surface 4 of the support body 2 extend.

The pressure body 6 has a conically shaped axial end surface 11 on. The cone is designed so that the axial end surface 11 is concave. In the axial direction, the pressure body 6 a material thickness of a maximum of about 4 mm.

The production of in 1 illustrated covering device 1 can be done as follows:
A wood-cylindrical blank, which consists for example of an elastomeric material, is deep-frozen, in order to prevent, or at least reduce, elasticity in the processing of the blank, and to improve the machinability. Then one of the axial end faces 11 the blank is conically ground. Finally, the radial incision 7 educated. This can be done for example by means of a turning tool. Thereafter, the covering device produced in this way 1 heated to room temperature.

This in 1 illustrated first embodiment of the covering 1 is intended for use with an inner ring. This is based on 2 explained in more detail.

2 shows that in 1 illustrated first embodiment of the covering 1 in assembled state in section. The cover device 1 is on an inner ring 12 appropriate. The inner ring 12 has in the illustrated first embodiment, a cylindrical track 13 on, on one side axially by a board 14 is limited. On board 14 is an axial contact surface 15 educated.

As it is in the career 13 and the contact surface 15 are functional surfaces, they should be kept free of coatings in many cases. Target on the inner ring 12 For example, a corrosion protection coating can be applied by means of a coating bath and the functional surfaces can be recessed from the coating, so on the inner ring 12 before dipping in the coating bath, the covering device 1 attached, as in 2 shown.

Again 2 it can be seen, are the inner surface 3 of the support body 2 as well as corresponding surfaces of the connecting web 8th and the Andruckkörpers 6 radially fixed to the track 13 of the inner ring 12 and thus prevents penetration of the bath medium to the raceway 13 ,

Furthermore, the axial end surface is located 11 of the pressure body 6 partially axially on the axial contact surface 15 of the inner ring 12 and thus prevents penetration of the bath medium to the axial contact surfaces 15 , An effective seal in the area of the axial contact surface 15 of the inner ring 12 is only guaranteed if the pressure body 6 in the radially outer region of the board 14 reliable against the axial contact surface 15 of the inner ring 12 is pressed. This assumes, first, that the covering 1 stuck on the track 13 of the inner ring 12 sits and can take the required axial force for pressing without shifting. A firm seat can be achieved by a comparatively hard elastomeric material. A hard elastomeric material hardly cushions and therefore makes a defined pressing of the pressure body 6 against the axial contact surface 15 of the inner ring 12 very difficult.

In the context of the invention is by the radial incision 7 even when using a comparatively hard elastomer material sufficient compression of the pressure body 6 ensured when the radial extent of the connecting web 8th not too big. In particular, should the connecting bar 8th extend radially outward maximum up to the largest radial position at which the pressure body 6 touching at the axial contact surface 15 of the inner ring 12 is applied. Through the radial cut 7 is thus in the cover 1 Achieved in the axial direction a significantly softer compression behavior than in the radial direction.

The according to 2 prepared inner ring 12 is immersed in a treatment bath. After a residence time, the inner ring 12 including the attached cover 1 removed from the treatment bath and rinsed. Thereafter, the cover device 1 again from the inner ring 12 removed and may be in the treatment of another inner ring 12 be used. This procedure has the consequence that the bath medium on all surfaces of the inner ring 12 except the career track 13 and the axial abutment surface 15 acts. Accordingly, a coating formed by the bath medium becomes on the entire surface of the inner ring 12 except the career 13 and the axial abutment surface 15 educated.

3 shows a second embodiment of the covering device according to the invention 1 in section. The second embodiment differs from the first embodiment in that the cover device 1 not for an inner ring 12 but is provided for an outer ring and accordingly has a slightly different geometry.

In the second embodiment, the cover device 1 also made of an elastically deformable material, in particular of a Elastomer material, manufactured and has a hollow cylindrical support body 2 with an inner lateral surface 3 and an outer circumferential surface 4 on. The supporting body 2 has an axis of rotation 5 and in particular with respect to the axis of rotation 5 formed rotationally symmetrical.

Relative to the axis of rotation 5 on both sides axially adjacent to the support body 2 is ever a pressure body 6 educated. Between the support body 2 and the Andruckkörpern 6 is ever a radial incision 7 educated. The radial cuts 7 each extends from the inner circumferential surface 3 of the support body 2 radially outward to the outer surface 4 However, they do not quite reach, so that in the axial region of the radial cuts 7 one connecting bar each 8th is formed, which the respective Andruckkörper 6 with the support body 2 combines. The radial cuts 7 each have an inner side surface 9 and an outer side surface 10 on. The inner side surfaces 9 are each the support body 2 facing and extending from the inner circumferential surface 3 of the support body 2 to the respective connecting bridge 8th , The outer side surfaces 10 are the pressure body 6 facing and extending from the radius of the inner circumferential surface 3 of the support body 2 to the respective connecting bridge 8th ,

In the second embodiment, the radial cuts 7 each formed as a keyway and taper radially outwardly, ie, with increasing distance from the inner circumferential surface 3 of the support body 2 , Accordingly, the inner side surfaces approach 9 and the outer side surfaces 10 the radial cuts 7 with increasing depth to each other.

The radial cuts 7 are designed so that their inner side surface 9 each a right angle with the outer surface 4 of the support body 2 form. The outer side surfaces 10 the radial cuts 7 form with the outer surface 4 of the support body 2 each at an angle of less than 90 °. In particular, the angle between the outer side surfaces 10 the radial cuts 7 and the outer lateral surface 4 of the support body 2 about 80 °. The radial cuts 7 can each extend over the entire circumference of the outer surface 4 of the support body 2 extend.

The pressure bodies 6 each have a conically shaped axial end surface 11 on. The cone is in each case designed so that the axial end surfaces 11 are concave shaped. In the axial direction, the pressure body 6 each a material thickness of a maximum of about 4 mm.

The production of in 3 illustrated covering device 1 can be done in an analogous manner, as for the in 1 illustrated covering device 1 described.

4 shows that in 3 illustrated second embodiment of the cover 1 in assembled state in section. The cover device 1 is on an outer ring 16 appropriate. The outer ring 16 has in the illustrated second embodiment, a cylindrical track 17 on, by two shelves axially 18 is limited. At the Borden 18 is in each case an axial contact surface 19 educated.

As it is in the career 17 and the axial abutment surfaces 19 are functional surfaces, they should be kept free of coatings in many cases. Target on the outer ring 16 By means of a coating bath, for example, a corrosion protection coating are applied and the functional surfaces are cut out from the coating, then the outer ring 16 before dipping in the coating bath, the covering device 1 attached, as in 4 shown.

Again 4 it can be seen, are the outer surface 4 of the support body 2 as well as corresponding surfaces of the connecting webs 8th and the pressure body 6 radially fixed to the track 17 of the outer ring 16 and thus prevent penetration of the bath medium to the career 17 ,

Furthermore, the axial end surfaces lie 11 the pressure body 6 partially axially on the axial contact surfaces 19 of the outer ring 16 and thus prevent penetration of the bath medium to the axial contact surfaces 19 , This should be the connecting webs 8th extend radially inwardly maximally to the smallest radial position at which the pressure body 6 touching at the axial contact surfaces 19 of the outer ring 16 issue.

The according to 2 prepared outer ring 16 is immersed in a treatment bath. After a residence time, the outer ring 16 including the attached cover 1 removed from the treatment bath and rinsed. Thereafter, the cover device 1 again from the outer ring 16 removed and may be in the treatment of another outer ring 16 be used. This procedure has the consequence that the bath medium on all surfaces of the outer ring 16 except the career track 17 and the axial abutment surface 19 acts. Accordingly, a coating formed by the bath medium becomes on the entire surface of the outer ring 16 except the career 17 and the axial abutment surfaces 19 educated

5 shows a third embodiment of the covering device according to the invention 1 in section. 6 shows that in 5 illustrated third embodiment of the cover 1 in assembled state in section.

Analogous to the first embodiment, the third embodiment of the cover device 1 for use with an inner ring 12 provided and has a support body 2 and a pressure body 6 on, which are arranged axially next to each other and connected by a connecting web. Between the support body 2 and the pressure body 6 is a radial incision 7 educated. Deviating from the first embodiment, the radial incision extends 7 from the inner lateral surface 3 of the support body 2 radially outward to the connecting bridge 8th , Besides, the radial incision is 7 not formed as a keyway, but has a substantially rectangular cross-section. The from the support body 2 opposite axial end surface 11 of the pressure body 6 is not conical but just trained. Incidentally, the third embodiment of the cover device is correct 1 consistent with the first embodiment.

How out 6 can be seen, the radial incision 7 through the career 13 of the inner ring 12 closed, so that a closed cavity is formed. This cavity is usually filled with gas, in particular with air. Will the inner ring 12 including cover device 1 immersed in a hot coating bath, so the gas in the cavity and it creates an overpressure. To minimize the risk of possible negative effects of overpressure, such as the escape of gas associated with fluid leakage, the radial incision becomes 7 formed in the third embodiment as small as possible, so that only a small cavity is formed.

7 shows a fourth embodiment of the covering device according to the invention 1 in section. 8th shows that in 7 illustrated fourth embodiment of the cover 1 in assembled state in section.

Analogous to the second embodiment, the fourth embodiment of the cover device 1 for use with an outer ring 16 provided and has a support body 2 and two on both sides axially adjacent to the support body 2 arranged pressure body 6 on. The pressure bodies 6 are through a connecting bridge 8th with the support body 2 connected. Between the support body 2 and the Andruckkörpern 6 is each a radial cut 7 formed in the form of a keyway. Deviating from the second embodiment, the radial cuts extend 7 in the fourth embodiment of the outer lateral surface 4 of the support body 2 radially inward to the connecting webs 8th , The from the support body 2 remote axial end surfaces 11 the pressure body 6 are not conical but just trained. Incidentally, the fourth embodiment of the cover device is correct 1 consistent with the second embodiment.

In the fourth embodiment, a similar cavity problem may arise as in the third embodiment, since the radial cuts 7 through the career 13 of the outer ring 16 be closed.

The cover device 1 is suitable, for example, for use in galvanizing bearing rings. The bearing rings can be coated with ZnNi, ZnFe or Zn, for example.

The described embodiments of the covering device 1 can be modified depending on the geometry of the bearing rings where they are to be used. Thus, it is possible the cover device 1 for example, to use in bearing rings with conical raceways. In addition, differently shaped radial cuts 7 be provided.

LIST OF REFERENCE NUMBERS

1

 covering

2

 support body

3

 Inner jacket surface

4

 Outer lateral surface

5

 axis of rotation

6

 press body

7

 Radial incision

8th

 connecting web

9

 Inner side surface

10

 Outer side surface

11

 Axial end surface

12

 inner ring

13

 career

14

 shelf

15

 Axial contact surface

16

 outer ring

17

 career

18

 shelf

19

 Axial contact surface

Claims (10)

Elastic cover device for partially covering a bearing ring ( 12 . 16 ) in a coating bath, with - a support body ( 2 ) and - a pressure body ( 6 ), in which - the supporting body ( 2 ) a rotation axis ( 5 ), - the pressure body ( 6 ) axially adjacent to the support body ( 2 ) is arranged, - between the pressure body ( 6 ) and the support body ( 2 ) a radial incision ( 7 ), - the pressure body ( 6 ) via a connecting bridge ( 8th ) with the support body ( 2 ), - the pressure body ( 6 ) in the unassembled state in the radial region of the radial incision ( 7 ) axially further from the support body ( 2 ) extends away than in the radial region of the connecting web ( 8th ). Covering device according to claim 1, wherein the pressure body ( 6 ) on its from the support body ( 2 ) facing away from the axial end surface ( 11 ) is conically shaped. Covering device according to one of the preceding claims, wherein the radial incision ( 7 ) tapers with the depth. Covering device according to one of the preceding claims, wherein the pressure body ( 6 ) in one piece with the support body ( 2 ) is trained. Cover device according to one of the preceding claims, wherein the support body ( 2 ) and the pressure body ( 6 ) extend over identical radial areas. Covering device according to one of the preceding claims, wherein the supporting body ( 2 ) is formed as a cylinder or as a hollow cylinder. Covering device according to one of the preceding claims, wherein the supporting body ( 2 ) and the pressure body ( 6 ) are made of an elastomeric material. Method for producing an elastic covering device ( 1 ) for partially covering a bearing ring ( 12 . 16 ) in a coating bath, wherein - a base body of an elastically yielding material having a rotation axis ( 5 ), is deep-frozen and - in the body a radial incision ( 7 ) is formed and thereby the main body in a supporting body ( 2 ) and a pressure body ( 6 ) is arranged axially adjacent to one another and via a connecting web ( 8th ) are connected. The method of claim 1, wherein the base body before or after formation of the radial incision ( 7 ) in the region of at least one axial end surface ( 11 ) is ground conically. Method of partially coating a bearing ring, wherein a covering device ( 1 ) according to one of claims 1 to 7 on the bearing ring ( 12 . 16 ), the bearing ring ( 12 . 16 ) including cover device ( 1 ) is immersed in a coating bath, the bearing ring ( 12 . 16 ) including cover device ( 1 ) is removed from the coating bath after a residence time and the covering device ( 1 ) from the bearing ring ( 12 . 16 ) Will get removed.

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