Sealing arrangement for a wheel bearing

Abstract

A seal arrangement for a wheel bearing having first bearing part and a second bearing part integrally connected to a wheel bearing flange, between which bearing parts rolling elements are guided. The sealing arrangement includes: a carrier element, which is connected to the first bearing part and an elastic element is provided on the carrier element. The elastic element has at least one sealing lip, and the carrier element has a fastening section, which is connected to the first bearing part. A stop part is fastened to the second bearing part with which the at least one sealing lip is in rubbing contact. The wheel bearing flange has an axial projection at least partially surrounds an axial projection of the first bearing part, and an inner surface of the axial projection of the wheel bearing flange forms a seat for the stop part.

Claims

1. A seal arrangement of a wheel bearing having a first bearing part and having a second bearing part which is connected in one piece to a wheel bearing flange, rolling bodies being guided between said first and second bearing parts, the seal arrangement comprises: a carrier element connected to the first bearing part; an elastic element provided on the carrier element, the elastic element has at least one sealing lip; a fastening portion connected to the first bearing part; a run-on part fastened to the second bearing part and against which the at least one sealing lip is in rubbing contact; an axial projection on the wheel bearing flange; an axial projection on the first bearing part, the axial projection of the wheel bearing flange at least partially surrounds the axial projection of the first bearing part, and at least a portion of the run-on part also at least partially surrounds the axial projection of the first bearing part; and an inner surface of the axial projection of the wheel bearing flange forms a seat for the run-on part.

2. The seal arrangement as claimed in claim 1, wherein a first sealing gap is formed between an end side of the axial projection of the wheel bearing flange and an end side of the first bearing part.

3. The seal arrangement as claimed in claim 1, further comprising at least one run-off channel on at least one of an outer peripheral surface of the wheel bearing flange or on an outer peripheral surface of the first bearing part.

4. The seal arrangement as claimed in claim 1, wherein the carrier element is fastened on an inner peripheral surface of the first bearing part by the fastening portion.

5. The seal arrangement as claimed in claim 1, wherein the wheel bearing flange, facing the wheel bearing, is formed with a radially extending side surface and is adjacent to an outer surface, which, on the second bearing part, is adjoined by rolling body raceways and receives the run-on part in a direction of the wheel bearing flange, and at least one groove formed with an encircling shape is arranged in a transition region between the outer surface and the side surface.

6. The seal arrangement as claimed in claim 5, wherein a groove base of the groove is formed with at least one radius.

7. The seal arrangement as claimed in claim 6, wherein a clearance is formed between the run-on part and the groove base.

8. A wheel bearing, comprising: a first bearing part; a second bearing part connected in one piece to a wheel bearing flange; rolling bodies guided between said first and second bearing parts; a seal arrangement including: a carrier element connected to the first bearing part; an elastic element provided on the carrier element, the elastic element having at least one sealing lip; a fastening portion connected to the first bearing part; a run-on part fastened to the second bearing part and against which the at least one sealing lip is in rubbing contact; an axial projection on the wheel bearing flange; an axial projection on the first bearing part, the axial projection of the wheel bearing flange at least partially surrounds the axial projection of the first bearing part and at least a portion of the run-on part also at least partially surrounds the axial projection of the first bearing part; and an inner surface of the axial projection of the wheel bearing flange forms a seat for the run-on part.

9. The wheel bearing of claim 8, wherein a first sealing gap is formed between an end side of the axial projection of the wheel bearing flange and an end side of the first bearing part.

10. The wheel bearing as claimed in claim 8, further comprising at least one run-off channel on at least one of an outer peripheral surface of the wheel bearing flange or on an outer peripheral surface of the first bearing part.

11. The wheel bearing as claimed in claim 8, wherein the carrier element is fastened on an inner peripheral surface of the first bearing part by the fastening portion.

12. The wheel bearing as claimed in claim 8, wherein the wheel bearing flange, facing the wheel bearing, is formed with a radially extending side surface and is adjacent to an outer surface, which, on the second bearing part, is adjoined by rolling body raceways and receives the run-on part in a direction of the wheel bearing flange, and at least one groove formed with an encircling shape is arranged in a transition region between the outer surface and the side surface.

13. The wheel bearing as claimed in claim 12, wherein a groove base of the groove is formed with at least one radius.

14. The wheel bearing as claimed in claim 13, wherein a clearance is formed between the run-on part and the groove base.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) Three exemplary embodiments according to the disclosure will be presented below on the basis of three figures. In the drawings:

(2) FIG. 1 shows a longitudinal section of a wheel bearing with a seal arrangement according to a first embodiment,

(3) FIG. 2 shows a longitudinal section of a wheel bearing with a seal arrangement according to a second embodiment, and

(4) FIG. 3 shows a longitudinal section of a wheel bearing with a seal arrangement according to a third embodiment.

DETAILED DESCRIPTION

(5) FIG. 1 shows a longitudinal section of a wheel bearing 1 (illustrated merely in part) with a seal arrangement 2 according to the disclosure. The wheel bearing 1 has a first bearing part 3, which is formed as an outer ring 4, and, in the state of installation, is connected to a wheel carrier (not illustrated). A second bearing part 5, which forms the inner ring 6, is also provided. The second bearing part 5 has a wheel bearing flange 7 which is connected in one piece. Two rolling body rows 8, 9 are guided between the first bearing part 3 and the second bearing part 5.

(6) The seal arrangement 1 of the wheel bearing 2 comprises a carrier element 10, which is connected to the inner periphery of the first bearing part 3 by means of a press fit. An elastic element 11 is provided on the carrier element 10, wherein the elastic element 11 has at least one sealing lip. The carrier element 10 also has a fastening portion for fastening on the first bearing part 3. In order to avoid pitting corrosion below the fastening portion, a so-called static seal is formed by means of a sealing ring integrally formed on the elastic part.

(7) The seal arrangement moreover has a run-on part 12, which is fastened to the second bearing part 5 and against which the at least one sealing lip is in rubbing contact. It can furthermore be seen that the wheel bearing flange 7 has an axial projection 13. This axial projection 13 at least partially surrounds an axial projection 14 of the first bearing part 3. On the basis of this embodiment, a pre-seal in the form of a labyrinth seal is formed. In this case, a first sealing gap is formed between an end side 16 of the axial projection 13 of the wheel bearing flange 7 and an end side 17 of the first bearing part 3. The end side 17 of the first bearing part is formed here on a side surface which radially adjoins the projection 14 and which extends radially away from rolling body rows 8, 9.

(8) Furthermore, an inner surface 15 of the axial projection 13 of the wheel bearing flange 7 forms a seat for the run-on part 12. In this way, the seat known from the prior art in the region of the transition between the second bearing part 5 and the radial bearing flange 7 is not required.

(9) The axial projection 13 is adjoined by a radially extending side surface 18. Furthermore, provision is made of an outer surface 19, which, on the second bearing part 5, is adjoined by rolling body raceways and is adjacent in the direction of the wheel bearing flange 7. The outer surface 19 may be of cylindrical form and have a conical profile. This outer surface 19 merges into the radially extending side surface 18 in a transition region 20. A radial, and/or axial, encircling groove 21 is formed in the transition region 20. The groove 21 is able to be matched to the respective geometry of the wheel bearing flange 7. A groove base 22 of the groove 21 is formed with at least one radius. A clearance is formed between the groove base 22 and the run-on part 12. Said clearance may be used for storing sealant, grease, etc.

(10) It can furthermore be seen from FIG. 1 that, on an outer peripheral surface 23 of the wheel bearing flange 7 or of the projection 13 and on an outer peripheral surface 24 of the first bearing part 3, in each case one run-off channel 25, 26 is provided. These run-off channels 25, 26 form a type of pre-seal, which is intended to prevent the infiltration of dirt into the bearing interior.

(11) FIGS. 2 and 3 show further exemplary embodiments. Identical parts are denoted by the same reference signs as in the preceding FIG. 1.

(12) FIG. 2 shows a second exemplary embodiment. The difference in relation to the preceding FIG. 1 is that the run-on part additionally extends radially along the end side 16.

(13) FIG. 3 shows a third exemplary embodiment. Here, by contrast to the previous figures, merely one run-off channel 27 is provided. In this case, said run-off channel is formed on an outer circumferential surface 28 of the projection 14.

LIST OF REFERENCE SIGNS

(14) 1 Wheel bearing

(15) 2 Seal arrangement

(16) 3 First bearing part

(17) 4 Outer ring

(18) 5 Second bearing part

(19) 6 Inner ring

(20) 7 Wheel bearing flange

(21) 8 Rolling body row

(22) 9 Rolling body row

(23) 10 Carrier element

(24) 11 Elastic element

(25) 12 Run-on part

(26) 13 Projection of the wheel bearing flange

(27) 14 Projection of the first bearing part

(28) 15 Inner surface

(29) 16 End side

(30) 17 End side

(31) 18 Side surface

(32) 19 Outer surface

(33) 20 Transition region

(34) 21 Groove

(35) 22 Groove base

(36) 23 Outer circumferential surface

(37) 24 Outer circumferential surface

(38) 25 Run-off channel

(39) 26 Run-off channel

(40) 27 Run-off channel

(41) 28 Outer circumferential surface