DE102015201485A1 - Double row axial needle bearing - Google Patents

Abstract

The invention relates to a double-row axial needle bearing which consists of at least one angle plate (2) and of an outer axial needle ring (3) inserted into this angle plate (2) and an inner axial needle ring (4) arranged coaxially therewith. These Axialnadelkränze (3, 4) are each formed by a Axialnadelkäfig (5, 6) and a plurality in this guided in the direction of rotation and on the angle disc (2) rolling bearing needles (7, 8), each Axialnadelkäfig (5, 6) a thin-walled annular disc having a W- or M-shaped profile cross-section, whose individual profile limb is formed by an outer radial edge of the annular disc formed on the outer edge (9, 11), an integrally formed on the inner edge of the annular disc inner radial board (10, 12) and an intermediate U-shaped bead (17, 18) connected via inner and outer axial profile sections (13, 14, 15, 16) to the inner and outer radial ribs (9, 10, 11, 12) is formed, out of and out of the adjacent axial profile sections (13, 14, 15, 16) a number of uniformly spaced, rectangular cage pockets (19, 20) are excluded, in which the bearing needles (7, 8) are held. According to the invention, this axial needle bearing (1) is characterized in that the axial needle bearing (1) has only one angle disc (2) with only one outer radial board (21) and two integral needle roller rings (3, 4), of which the outer axial needle bearing (3 ) with the outer radial board (9) of its Axialnadelkäfigs (5) in the edge of the Radialbordes (21) of the angle plate (2) molded locking lugs (22) in the angle disc (2) is fixed, while the inner Axialnadelkranz (4) via to the outer radial board (11) of its Axialnadelkäfigs (6) and to the inner radial board (10) of the Axialnadelkäfigs (5) of the outer Axialnadelkranzes (3) formed and at least radially overlapping profile webs (23, 24) in the angle plate ( 2) can be fixed, that the axial needle bearing (1) is formed after the assembly of all its individual parts as a captive unit.

Description

Field of the invention

The invention relates to a double-row axial needle bearing according to the preamble-forming features of claim 1, which is particularly advantageous for mounting the ball screw on an electric parking brake in a motor vehicle applicable.

Background of the invention

The introduction of the electric parking brake in modern motor vehicles as a replacement for the no longer up-to-date hand brake technology should serve to relieve the driver and to increase not only comfort but also driving safety. The electric parking brake over the functionality of a conventional parking brake also has the advantage that the installation of a Bowden cable in the vehicle and the ergonomic usually not optimal controls eliminated and additional functionalities, such as blocking prevention while driving or a traction on the mountain, integrated into the brake system can be. Such an electric parking brake is, for example, by the DE 40 21 572 A1 for a disc brake system of a vehicle, in which a brake caliper engages around a brake disc, wherein the brake disc can be clamped between the brake pads by a brake piston is pressed against one of the brake pads. The brake piston is connected to a spindle nut of a ball screw, which is arranged with the interposition of balls on a threaded spindle. The threaded spindle can be set in rotation by means of an electric motor, wherein under the relative rotation between the threaded spindle and the spindle nut, the brake piston connected to the spindle nut can be displaced axially relative to the threaded spindle in the direction of the brake linings. The threaded spindle is mounted on a housing of the braking device via a thrust bearing, so that the axial braking force exerted by the brake piston can be introduced into the housing via this thrust bearing. In this case, the thrust bearing in most embodiments, for example, from the DE 1 174 113 A1 known Axialnadelkranz, which consists of a profile cross-section SIGMA-shaped needle cage and a plurality between two pulleys circular rolling bearing needles, which are guided in transverse to the cage profile in the needle cage incorporated cage pockets in the direction of rotation and held in this.

In practice, however, it has been shown that such thrust bearings no longer meet the requirements of the ever-increasing loads of electric parking brakes and increasingly come up against the limits of their carrying capacity. Thus, it was found that sometimes extremely high locking forces of the parking brake cause that the trapped between the bearing discs needles or the discs of the thrust bearing even after a short period of use already showed cracks, the failure of the bearing needles or discs and ultimately to the failure of Parking brake led. The use of larger diameter bearing needles in the context of the available Axialbauraums as the first countermeasure or in the DE 10 2009 058 029 A1 Proposed formation of the axial needle ring with twin pockets to increase the number of bearing needles could not fully contribute to the elimination of the problem.

Another way to increase the carrying capacity of a Axialnadelellagers significantly is the in the JP 2007-224 978 A2 revealed double-row thrust roller bearings shown. This double-row thrust roller bearing consists of an upper angle disc with an outer radial flange and a lower angle disc with an inner radial board and an arranged between these Winkelscheiben outer Axialnadelkranz and coaxially disposed therewith inner Axialnadelkranz, as well as the outer Axialnadelkranz by a Axialnadelkäfig and a variety is formed in this guided in the direction of rotation and rolling on the angle discs bearing needles. Each Axialnadelkäfig consists of a thin-walled annular disc with a W- or M-shaped profile cross-section, the individual profile legs formed by an integrally formed on the outer edge of the annular disc outer radial board, an integrally formed on the inner edge of the annular disc inner radial board and an inner and outer axial Profile sections are formed with the inner and outer radial ribs connected central U-shaped bead, are excluded from and from the adjacent axial profile sections a number of uniformly spaced, rectangular cage pockets in which the bearing needles are held. To preassemble the two Axialnadelkränze for transport to the bearing assembly, the outer Axialnadelkranz is divided into two halves and has on its inner radial board to the outer radial board of the inner Axialnadelkranzes facing, axially straight or U-shaped profile extension, which in a similar to the inner radial board of the outer Axialnadelkranzes facing profile extension engages the outer radial board of the inner Axialnadelkranzes.

A disadvantage of this double-row thrust roller bearing, however, is that for the connection of the two Axialnadelkränze a division of the outer Axialnadelkranzes in two halves is necessary and that the two Axialnadelkränze then connected to each other but both Axialnadelkränze are not fixed in the angle discs. As a result, on the one hand increased manufacturing and assembly costs and on the other hand, the Axialnadelkränze fall during transport of the Axialnadellagers or during its assembly from the angle plates, so that it can lead to assembly delays.

Object of the invention

Based on the stated disadvantages of the known prior art, the invention is therefore the object of the invention to design a double-row thrust needle bearing, which is characterized by a simplified assembly and in which falling out of the Axialnadelkränze from the angle discs during transport or during assembly of the Axialnadellagers effectively avoided.

Description of the invention

According to the invention, this object is achieved in a double-row thrust bearing according to the preamble of claim 1 such that the thrust needle bearing only an angle disc with only one outer radial flange and two integrally formed Axialnadelkränze has, of which the outer Axialnadelkranz with the outer radial board of his Axialnadelkäfigs about in the edge of the radial flange of the angle plate molded locking lugs in the angle plate is fixed, while the inner Axialnadelkranz on about the outer radial board of its Axialnadelkäfigs and on the inner radial board of the Axialnadelkäfigs the outer Axialnadelkranzes molded and at least radially overlapping profile webs is fixed in the angle disc in that, after the assembly of all its individual parts, the axial needle bearing is designed as a captive unit.

Preferred embodiments and advantageous developments of the inventively designed double-row axial needle bearing are described in the subclaims 2 to 4.

Thereafter, it is provided according to claim 2 in the inventively designed double-row thrust needle bearing that the outer Axialnadelkranz an Axialnadelkäfig having a W-shaped profile cross-section and the inner Axialnadelkranz an axial needle cage having an M-shaped profile cross section, so that the end of the inner radial Bordes of the outer Axialnadelkäfigs radially higher than the end of the outer radial board of the inner Axialnadelkäfigs is arranged.

According to claim 3, it is a first embodiment of the present invention formed double-row axial needle bearing that integrally formed on the inner radial board of the outer Axialnadelkäfigs and the outer radial board of the inner Axialnadelkäfigs profile webs are preferably designed as mutually directed straight axial webs in the installed position of the Axialnadellagers a have friction-preventing radial distance from each other. This means that the angle of the disc extending away inner radial board of the outer Axialnadelkäfigs and the Winkelscheibe extending outer radial board of the inner Axialnadelkäfigs are radially extended and approximately at the level of two-thirds of their total length at right angles to each other Axialnadelkäfig out angled , Thus, after inserting the inner Axialnadelkranzes in the angle plate and then clipping the outer Axialnadelkranzes in the angle disc of the straight Axialsteg on the outer board Axialnadelkäfigs the inner Axialnadelkranzes of the straight Axialsteg on the inner board of the Axialnadelkäfigs the outer Axialnadelkranzes so covered that the inner Axialnadelkranz is held captive by the outer Axialnadelkranz in the angle plate without both Axialnadelkränze touch radially in the installed position of the Axialnadellagers.

Finally, it is proposed as a second embodiment of the present invention designed double row axial needle bearing by claim 4, that the integrally formed on the inner radial board of the outer Axialnadelkäfigs and the outer radial board of the inner Axialnadelkäfigs profile webs are preferably designed as mutually facing and interlocking angle webs, the Have in the installed position of the axial needle bearing both friction-preventing radial distances and friction-avoiding axial distances from one another. This is to be understood as meaning that the inner radial flange of the outer axial needle cage extending from the angle plate and the outer radial flange of the inner axial needle cage extending toward the angle plate are formed radially even longer than in the first embodiment and approximately at the height of the central beads of the axial needle cages have at right angles to the other axial needle ring out angled and at their free ends have a further angle to the angle or away from this extending angled. As a result, engages after inserting the inner Axialnadelkranzes in the angle plate and the subsequent clipping of the outer Axialnadelkranzes in the Winkelscheibe the Winkelsteg on the inner board of the Axialnadelkäfigs the outer Axialnadelkranzes in the Winkelsteg on the outer board of the Axialnadelkäfigs the inner Axialnadelkranzes such that the inner Axialnadelkranz captive is held by the outer Axialnadelkranz in the angle plate, without both Axialnadelkränze in the installation position of the Axialnadellagers radially or axially.

In summary, the double-row thrust needle bearing designed according to the invention thus has the advantage over the known from the prior art double-row thrust needle bearings that it facilitates the installation by the use of one-piece Axialnadelkränzen and that by a clip connection of the outer Axialnadelkranzes with the angle plate and by overlapping Profile webs on the oppositely disposed inner and outer edges of the Axialnadelkäfige both Axialnadelkränze falling out of the Axialnadelkränze from the angle plate during transport or during assembly of the Axialnadellagers is effectively avoided.

Brief description of the drawings

The inventively embodied double-row axial needle bearing is explained below in two preferred embodiments with reference to the accompanying drawings. Showing:

1 a three-dimensional cross-section through a first embodiment of an inventively designed double-row axial needle bearing;

2 an enlargement of the detail X of the inventively designed double row axial needle bearing according to 1 ;

3 a three-dimensional cross-section through a second embodiment of an inventively designed double-row axial needle bearing;

4 an enlargement of the detail Y of the inventively designed double row axial needle bearing according to 2 ,

Detailed description of the drawings

In the 1 and 3 is in each case the cross section of a double row axial needle bearing 1 to see which, in essence, an angle disc 2 as well as from one in this Winkelscheibe 2 inserted outer axial needle ring 3 and arranged coaxially to this, also in the Winkelscheibe 2 inserted inner axial needle ring 4 consists. Both the outer axial needle ring 3 as well as the inner Axialnadelkranz 4 are doing through an axial needle cage 5 . 6 and a plurality in this circulating guided bearing needles 7 . 8th formed on the angle disc 2 roll.

From the 2 and 4 goes on to show that each Axialnadelkäfig 5 . 6 consists of a thin-walled profiled annular disc, wherein the individual profile limbs formed by an outer radial rim formed on the outer edge of the annular disc 9 . 11 a formed on the inner edge of the annular disc inner radial board 10 . 12 and one over inner and outer axial profile sections 13 . 14 . 15 . 16 with the inner and outer radial ribs 9 . 10 . 11 . 12 connected middle U-shaped bead 17 . 18 be formed. From this bead 17 . 18 and from the adjacent axial profile sections 13 . 14 . 15 . 16 are then a number of evenly spaced, rectangular cage pockets 19 . 20 except in which the bearing needles 7 . 8th being held. Clearly visible, the outer Axialnadelkranz 3 while an axial needle cage 5 with a W-shaped profile cross section and the inner Axialnadelkranz 4 an axial needle cage 6 with an M-shaped profile cross-section on, leaving the end of the inner radial Bordes 10 of the axial needle cage 5 of the outer axial needle ring 3 radially higher than the end of the outer radial board 11 of the axial needle cage 6 of the inner axial needle ring 4 is arranged.

Furthermore, from the 2 and 4 it can be seen that the axial needle bearing 1 According to the invention, an angle disc 2 with only one outer radial board 21 and two integrally formed Axialnadelkränze 3 . 4 having, of which the outer Axialnadelkranz 3 with the outer radial board 9 its axial needle cage 5 over into the edge of the radial board 21 the angle disc 2 molded locking lugs 22 in the angle disc 2 can be fixed. The inner axial needle ring 4 is on the other hand to the outer radial board 11 its axial needle cage 6 as well as to the inner radial board 10 of the axial needle cage 5 of the outer axial needle ring 3 molded and at least radially overlapping profile webs 23 . 24 so in the angle wheel 2 fixable that the axial needle bearing 1 after assembly of all its parts is designed as a captive unit.

In the in the 1 and 2 shown first embodiment of the double row axial needle bearing according to the invention are to the inner radial board 10 of the axial needle cage 5 of the outer axial needle ring 3 and to the outer radial board 11 of the axial needle cage 6 of the inner axial needle ring 4 molded profile webs 23 . 24 in this case designed as aligned straight axial webs, in the installed position of the Axialnadellagers 1 have a friction-preventing radial distance from each other. This will after inserting the inner Axialnadelkranzes 4 in the angle disc 2 and then clipping the outer Axialnadelkranzes 5 in the angle disc 2 the straight axial bridge 24 on the outer board 11 Axialnadelkäfigs 6 of the inner axial needle ring 4 from the straight axial bridge 23 on the inner board 10 of the axial needle cage 5 of the outer axial needle ring 3 so covered that the inner Axialnadelkranz 4 captive from the outer axial needle ring 3 in the angle plate 2 is held without both Axialnadelkränze 3 . 4 in the installation position of the axial needle bearing 1 touch radially.

The in the 3 and 4 Pictured second embodiment of the double-row axial needle bearing according to the invention 1 on the other hand differs from the first embodiment in that the to the inner radial board 10 of the axial needle cage 5 of the outer axial needle ring 3 and to the outer radial board 11 of the axial needle cage 6 of the inner axial needle ring 4 molded profile webs 23 . 24 are preferably designed as mutually directed and interlocking angle webs, in the installed position of the Axialnadellagers 1 Both have friction-preventing radial distances and friction-avoiding axial distances from one another. This engages after inserting the inner Axialnadelkranzes 4 in the angle disc 2 and then clipping the outer Axialnadelkranzes 3 in the angle disc 2 the angle bridge 23 on the inner board 10 of the axial needle cage 5 of the outer axial needle ring 3 in the Winkelsteg 24 on the outer board 11 of the axial needle cage 6 of the inner axial needle ring 4 such that the inner Axialnadelkranz 4 also captive from the outer Axialnadelkranz 3 is held in the angle disc, without both Axialnadelkränze in installation position of the Axialnadellagers 1 touch radially or axially.

LIST OF REFERENCE NUMBERS

1

 axial needle

2

 angle plate

3

 outer axial needle ring

4

 inner axial needle ring

5

Axial needle cage of 3

6

Axial needle cage of 4

7

Needles from 3

8th

Needles from 4

9

outer radial board of 5

10

inner radial board of 5

11

outer radial board of 6

12

inner radial board of 6

13

axial profile section on 5

14

axial profile section on 5

15

axial profile section on 6

16

axial profile section on 6

17

Beading in 5

18

Beading in 6

19

Cage pockets in 5

20

Cage pockets in 6

21

Radial board on 2

22

Latching lugs on 21

23

Profile web on 10

24

Profile web on 11

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 4021572 A1 [0002]
• DE 1174113 A1 [0002]
• DE 102009058029 A1 [0003]
• JP 2007-224978 A2 [0004]

Claims (4)

Double row axial needle bearing ( 1 ), consisting essentially of at least one angle plate ( 2 ) as well as from one in this angle disc ( 2 ) used outer axial needle ring ( 3 ) and a coaxial with this, also in the angle disc ( 2 ) inserted inner Axialnadelkranz ( 4 ), which as well as the outer Axialnadelkranz ( 3 ) through an axial needle cage ( 5 . 6 ) and a plurality in this in the direction of rotation guided as well as on the angle disc ( 2 ) rolling bearing needles ( 7 . 8th ) is formed, each Axialnadelkäfig ( 5 . 6 ) consists of a thin-walled annular disc with a W- or M-shaped profile cross-section whose individual profile limbs are formed by an outer radial flange formed on the outer edge of the annular disc ( 9 . 11 ), an integrally formed on the inner edge of the annular disc inner radial board ( 10 . 12 ) and one over inner and outer axial profile sections ( 13 . 14 . 15 . 16 ) with the inner and outer radial ribs ( 9 . 10 . 11 . 12 ) connected middle U-shaped bead ( 17 . 18 ) are formed, from and out of the adjacent axial profile sections ( 13 . 14 . 15 . 16 ) a number of equally spaced, rectangular cage pockets ( 19 . 20 ), in which the bearing needles ( 7 . 8th ), characterized in that the axial needle bearing ( 1 ) only one angle plate ( 2 ) with only one outer radial board ( 21 ) and two one-piece axial needle rims ( 3 . 4 ), of which the outer Axialnadelkranz ( 3 ) with the outer radial board ( 9 ) of its axial needle cage ( 5 ) into the edge of the radial board ( 21 ) of the angle disc ( 2 ) molded locking lugs ( 22 ) in the angle disc ( 2 ) is fixable while the inner Axialnadelkranz ( 4 ) over to the outer radial board ( 11 ) of its axial needle cage ( 6 ) as well as to the inner radial board ( 10 ) of the axial needle cage ( 5 ) of the outer axial needle ring ( 3 ) molded and at least radially overlapping profile webs ( 23 . 24 ) in the angle plate ( 2 ) is fixable that the axial needle bearing ( 1 ) is formed after the assembly of all its individual parts as a captive unit. Double row axial needle bearing according to claim 1, characterized in that the outer axial needle ring ( 3 ) an axial needle cage ( 5 ) with a W-shaped profile cross-section and the inner axial needle ring ( 4 ) an axial needle cage ( 6 ) having an M-shaped profile cross-section, so that the end of the inner radial Bordes ( 10 ) of the axial needle cage ( 5 ) of the outer axial needle ring ( 3 ) radially higher than the end of the outer radial board ( 11 ) of the axial needle cage ( 6 ) of the inner axial needle ring ( 4 ) is arranged. Double-row axial needle bearing according to claim 2, characterized in that on the inner radial board ( 10 ) of the axial needle cage ( 5 ) of the outer axial needle ring ( 3 ) and to the outer radial board ( 11 ) of the axial needle cage ( 6 ) of the inner axial needle ring ( 4 ) molded profile webs ( 23 . 24 ) are preferably designed as mutually directed straight axial webs, in the installation position of the axial needle bearing ( 1 ) have a friction-preventing radial distance from each other. Double-row axial needle bearing according to claim 2, characterized in that on the inner radial board ( 10 ) of the axial needle cage ( 5 ) of the outer axial needle ring ( 3 ) and to the outer radial board ( 11 ) of the axial needle cage ( 6 ) of the inner axial needle ring ( 4 ) molded profile webs ( 23 . 24 ) are preferably designed as mutually facing and interlocking angle webs, in the installed position of the axial needle bearing ( 1 ) have both friction-preventing radial distances and friction-avoiding axial distances from one another.

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