DE102022133442B4 - Axial rolling bearings with a flared guide means - Google Patents

Abstract

Axial rolling bearing (10) having a bearing cage (12), a plurality of rolling elements (14), at least one rolling element pocket (16) which accommodates at least one of the rolling elements (14) and is designed as a recess (18) in the bearing cage (12) bordered by an edge surface (17), at least one guide means (22) which extends out from the bearing cage (12) and has a contact area (26) which rests on at least one end face (24) of the rolling element (14), the guide means (22) being extended on an edge of the rolling element pocket (16) in the axial direction (20) and the edge surface (17) which is axially offset as a result rests on the end face (24) of the rolling element (14) as a contact area (26). characterized in that the guide means (22) forms an axially flared pocket-shaped elevation (46).

Description

The invention relates to an axial rolling bearing according to the preamble of claim 1.

In JP 2011 - 144 866 A an axial roller bearing with a bearing cage, several rolling elements and several rolling element pockets is described. The rolling element pockets each accommodate a rolling element and are each designed as a recess in the bearing cage bordered by an edge surface. A guide means protruding from the bearing cage forms a contact area that rests on one end face of the rolling element. For this purpose, the guide means is bent over as a one-piece tab protruding from the bearing cage and rests on the end face of the rolling element with the contact area arranged on a base surface of the tab.

In JP 2015 - 55 274 A describes an axial roller bearing comprising a cage with an annular part consisting of an annular plate and provided with a plurality of pockets arranged in the circumferential direction and in which rollers are accommodated. The cage has axially protruding guide means which have rounded surfaces which are part of the inner surface of the pocket or the edge surface and whose edges are in contact with the end faces of the rolling elements. The edges are part of the inner surface of the pocket or the edge surface.

WO 2008 / 088 014 A1 describes a cage consisting of a single annular disc with rectangular pockets for receiving needle rollers. The pockets are provided at several circumferential positions by punching the disc. In each pocket, projections are provided on the outside diameter side and the inside diameter side of the inner wall of the pocket. The projections project towards the center of rotation of the axial end faces of each needle roller and are bent out at an angle. The upper ends of the projections (8, 9) are point-shaped and are in point contact with the center of rotation of the axial end faces of the needle roller received in the pocket.

In DE 695 28 149 T2 a radial bearing cage is described. The cage has pockets that accommodate a bearing roller, which are spaced apart from one another in the circumferential direction by crossbars that are axially deformed. The cage therefore has a so-called "sigma" profile. At the radial end of the pockets, cage sections are bent out in the axial direction and have indentations. The bearing rollers rest with their end faces on the bent out cage sections.

The aim of the present invention is to further reduce the manufacturing costs of the axial rolling bearing. In addition, the rolling element should be guided more stably in the bearing cage. Complex tools for manufacturing the axial rolling bearing should be eliminated.

At least one of these objects is achieved by an axial rolling bearing having the features of claim 1.

This allows the rolling element to be guided more stably in the bearing cage and the axial rolling bearing can absorb higher radial loads. In addition, the guide means can be installed more easily and cost-effectively.

The axial rolling bearing can be designed as a cylindrical roller bearing or an axial needle bearing. The rolling element can be a cylindrical roller or a needle.

The rolling element can have a further end face opposite the end face, in particular in a direction along a rotational axis of the rolling element. The end face can have a flat end face. The end face can also have a shape that differs from a flat face, which is in particular conical or spherical.

The rolling element can be cylindrical. The rolling element can have a cylinder shell between the front side and the other front side. The rolling element can roll with the cylinder shell against the components to be supported by the axial rolling bearing. The rolling element can have a longitudinal axis that directly connects the front side with the other front side. The rolling element can be rotatable about an axis of rotation. The axis of rotation can coincide with the longitudinal axis. The rolling element can have a length in relation to the longitudinal axis that is less than three times, preferably twice, the diameter of the rolling element. This can reduce the friction of the axial rolling bearing during storage.

The guide means can be designed as a shelf, here as a simple shelf.

The edge surface is understood to be a boundary surface facing the recess that is different from the surface or base area. The edge surface does not necessarily have to be a flat surface, but can also be curved.

The invention provides that the guide means forms an axially protruding pocket-shaped elevation. The pocket-shaped elevation can be free of recesses and can have a closed surface. The pocket-shaped elevation can be formed from the bearing cage by bending. The pocket-shaped elevation can serve as a space for a lubricant for lubricating the axial rolling bearing.

In a preferred embodiment of the invention, the edge surface of the guide means is an axially offset continuation of the edge surface of the recess. The edge surface can be reworked to adapt the contact area to the front side of the rolling element in order to implement the contact on the front side in a particularly abrasion-resistant and friction-reduced manner.

In a preferred embodiment of the invention, it is advantageous if the guide means has only the edge surface facing the rolling element as edge surfaces. Due to the axial projection of the guide means, a transition edge can be present between the guide means and the bearing cage, which, however, does not form an edge surface facing the recess and also does not otherwise form a boundary to another recess.

In a preferred embodiment of the invention, it is provided that the guide means is free of edge surfaces when viewed in at least one of the two circumferential directions and thus connects to the bearing cage without interruption. The guide means can also be free of edge surfaces when viewed in at least one direction facing away from the rolling element and thus connects to the bearing cage without interruption.

In a preferred embodiment of the invention, it is advantageous if the guide means is free of edge surfaces when viewed in both circumferential directions and thus connects to the bearing cage without interruption. This can increase the stability of the guide means. The axial roller bearing can support larger radial forces via the rolling body on the guide means.

In a preferred embodiment of the invention, it is advantageous if the edge surface resting on the rolling element has a U-shaped arch projected onto the rolling element. This allows the contact area between the guide means and the end face to be increased.

In an advantageous embodiment of the invention, it is provided that the maximum of the arc shape facing away from the bearing cage is centered with the rolling element in relation to a circumferential direction. This allows the rolling element to be guided and supported evenly via the guide means. The arc shape can lie evenly on the front side. The contact area can also extend over only part of the arc shape. For example, the contact area can be arranged in the area of the axis of rotation of the rolling element.

A preferred embodiment of the invention is advantageous in which the arc shape encloses or surrounds a center of rotation of the rolling element. This can reduce the friction between the rolling element and the guide means. The center of rotation of the rolling element is preferably arranged centrally in relation to the end face.

In a special embodiment of the invention, it is advantageous if at least one such guide means with such a contact area rests on each of the rolling elements. This enables the axial rolling bearing to support radial forces between the components to be supported particularly effectively.

Further advantages and advantageous embodiments of the invention emerge from the description of the figures and the illustrations.

character description

• 1: Einen Querschnitt eines Axialwälzlager in einer speziellen Ausführungsform der Erfindung.
• 2: Den Ausschnitt A aus 1 in einer vergrößerten Ansicht.
• 3: Eine räumliche Ansicht des Axialwälzlagers aus 1.
• 4: Den Ausschnitt B aus 3 in einer vergrößerten Ansicht.
• 5: Eine Seitenansicht in Richtung C aus 4.

The invention is described in detail below with reference to the figures. In detail:

• 1 : A cross-section of an axial rolling bearing in a special embodiment of the invention.
• 2 : Section A from 1 in an enlarged view.
• 3 : A spatial view of the axial rolling bearing from 1 .
• 4 : Section B from 3 in an enlarged view.
• 5 : A side view in direction C from 4 .

1 shows a cross section of an axial roller bearing in a special embodiment of the invention. The axial roller bearing 10 has a bearing cage 12 in which several rolling elements 14, in particular needles, are accommodated in respective rolling element pockets 16. The rolling element pockets 16 are each designed as a recess 18 in the bearing cage 12. The needles are rotatably accommodated in the rolling element pockets 16 and can implement a bearing acting in the axial direction 20.

2 shows section A from 1 in an enlarged view. The rolling element pocket 16 is designed as a recess 18 in the bearing cage 12, bordered by an edge surface 17. A guide means 22 is protruding from the bearing cage 12, which has a guide on a front side 24 of the rolling element pers 14 has a contact area 26. On a side opposite the guide means 22 in the radial direction 30, a further guide means 28 is provided, which has a further contact area 34 adjacent to the further end face 32 of the rolling element 14 opposite in the radial direction 30. The guide means 22 and the further guide means 28 are preferably mirror-inverted but identical in structure with respect to the radial direction 30.

The rolling element 14 is cylindrical with a cylinder shell 36 located in the radial direction 30 between the front side 24 and the other front side 32. The rolling element 14 can roll with the cylinder shell 36 against the components to be axially supported, which are not shown here. The rolling element 14 has a longitudinal axis 38 that directly connects the front side 24 with the other front side 32 and can be rotated about an axis of rotation 40 that coincides with the longitudinal axis 38. The rolling element 14 preferably has a length 42 in relation to the longitudinal axis 38 that is less than three times, preferably twice, a diameter 44 of the rolling element 14.

The radial accommodation of the rolling element 14 between the guide means 22 and the further guide means 28 also enables a limited support of radial forces between the components to be supported.

The guide means 22 is provided on one edge of the rolling element pocket 16 in the axial direction 20 as a pocket-shaped elevation 46, whereby the axially offset edge surface 17 rests as a contact area 26 on the front side 24 of the rolling element 14. The edge surface 17 of the guide means 22 is thus an axially offset continuation of the edge surface of the recess 18. This can be reworked to adapt the contact area 26 to the front side 24 of the rolling element 14 in order to implement the contact on the front side 24 in a particularly abrasion-resistant and friction-reducing manner.

3 shows a spatial view of the axial rolling bearing from 1 . The guide means 22 rests with the contact area on the front side and the further guide means 28 rests with the further contact area on the further front side of the rolling element 14 in each case on the several rolling elements 14 which are evenly distributed circumferentially in the axial needle bearing.

4 shows section B from 3 in an enlarged view. The guide means 22 has only the edge surface 17 facing the rolling element 14 as edge surfaces. Otherwise, the guide means 22 is free of edge surfaces in both circumferential directions and in a direction 45 facing away from the rolling element 14 and the guide means 22 thus connects to the bearing cage 12 without interruption.

The rolling element pocket 16 is designed as a recess 18 made from the bearing cage 12. The bearing cage 12 has a circumferentially extending groove 47 which is interrupted by the recesses 18 and which has an edge surface 48 facing the rolling element 14 for receiving it on the circumference.

5 shows a side view in direction C from 4 The edge surface 17 resting on the rolling element 14 has a U-shaped arch shape 49 projected onto the rolling element 14. The maximum 50 of the arch shape 49 facing away from the bearing cage 12 is centered with the rolling element 14 in relation to a circumferential direction 51. The arch shape 49 encloses a center of rotation 52 of the rolling element 14.

list of reference symbols

10

axial rolling bearings

12

bearing cage

14

rolling elements

16

rolling element pocket

17

edge surface

18

recess

20

axial direction

22

management tools

24

front side

26

investment area

28

additional management tool

30

radial direction

32

another front side

34

further investment area

36

cylinder jacket

38

longitudinal axis

40

axis of rotation

42

length

44

diameter

45

Direction

46

survey

48

edge surface

49

arched shape

50

maximum

51

circumferential direction

52

turning center

Claims (8)

Axial rolling bearing (10) having a bearing cage (12), a plurality of rolling elements (14), at least one rolling element pocket (16) which receives at least one of the rolling elements (14) and is designed as a recess (18) in the bearing cage (12) bordered by an edge surface (17), at least one guide means (22) which extends out from the bearing cage (12) and has a contact area (26) which rests on at least one end face (24) of the rolling element (14), wherein the guide means (22) extends out in the axial direction (20) at an edge of the rolling element pocket (16) and the edge surface (17) which is axially offset as a result rests on the end face (24) of the rolling element (14) as a contact area (26). characterized in that the guide means (22) forms an axially extended pocket-shaped elevation (46). Axial roller bearing (10) according to claim 1 , characterized in that the guide means (22) has as edge surfaces exclusively the edge surface (17) facing the rolling body (14). Axial rolling bearing (10) according to one of the preceding claims, characterized in that the guide means (22) is free of edge surfaces when viewed in at least one of the two circumferential directions (51) and thus adjoins the bearing cage (12) without interruption. Axial roller bearing (10) according to claim 3 , characterized in that the guide means (22) is free of edge surfaces when viewed in both circumferential directions (51) and thus connects to the bearing cage (12) without interruption. Axial rolling bearing (10) according to one of the preceding claims, characterized in that the edge surface (17) resting on the rolling body (14) has a U-shaped arc shape (49) projected onto the rolling body (14). Axial roller bearing (10) according to claim 5 , characterized in that the maximum (50) of the arc shape (49) facing away from the bearing cage (12) is centered with the rolling body (14) with respect to a circumferential direction (51). Axial roller bearing (10) according to claim 5 or 6 , characterized in that the arc shape (49) encloses or surrounds a rotation center (52) of the rolling body (14). Axial rolling bearing (10) according to one of the preceding claims, characterized in that at least one such guide means (22) with such a contact area (26) rests on each of the rolling bodies (14).

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