DE102018127903B4 - Bearing assembly and transmission device with the bearing assembly - Google Patents

Abstract

Bearing arrangement (2) with a ball bearing (7), the ball bearing (7) having an inner ring (8) and an outer ring (9) and a plurality of rolling balls (10) arranged between the inner ring (8) and the outer ring (9), with an axial bearing (6), the axial bearing (6) being arranged coaxially with respect to an axis of rotation (D) on an axial end face of the ball bearing (7), characterized in that the axial bearing (6) is captive via a snap connection (16). is connected to the ball bearing (7), so that the ball bearing (7) and the axial bearing (6) form a common structural unit, the axial bearing (6) being designed as an axial needle bearing and an inner running disk (12), an outer running disk (13) and has a plurality of rolling elements (14) arranged in a rolling manner between the inner running disk (12) and the outer running disk (13) and designed as needle rollers, the rolling elements (14) being accommodated in an axial bearing cage (15), and the inner running disk (12) on a de m the side facing the ball bearing (7) rests in sections on an axial end face of the inner ring (7) and is connected to the inner ring (8) via the snap connection (16), and that the inner running disk (12) and the outer running disk (13) are captively connected to the Thrust bearing cage (15) are connected.

Description

The invention relates to a bearing assembly having the features of claim 1. The invention also relates to a transmission device having the bearing assembly.

To absorb radial and axial loads between two bearing partners, it is known to combine a radial bearing with an axial bearing. The radial bearing and the axial bearing can be designed as two separate bearing units. Alternatively, however, it is also known that the axial bearing is integrated into the radial bearing and the axial bearing and the radial bearing form a common structural unit. For this purpose, the inner ring of the axial bearing can also form a contact surface for the axial bearing, so that the rolling bodies of the axial bearing can run directly against the inner ring.

The pamphlet JP 2005 - 249 189 A describes a vehicle transmission in which gears or transmission shafts with gears are mounted with a generic bearing device. The bearing device consists of a thrust bearing which receives axial loads and a radial bearing which receives radial loads, the thrust bearing and the radial bearing jointly having a bearing ring.

Furthermore, the publication WO 2008/088 801 A1 is known, which discloses a double clutch transmission in which transmission components such as gear wheels or clutch elements are mounted with radial-axial bearing arrangements.

A bearing arrangement, which is formed from a combined cylindrical roller four-point ball bearing, is in DE 42 11 399 C2 disclosed. The cylindrical roller bearing and the four-point ball bearing are accommodated in an outer ring of the cylindrical roller bearing, which is designed in the manner of a flange, with the rolling track of the four-point bearing being formed on a separate outer ring. With its separate outer ring, the four-point bearing sits axially on a shoulder in the outer ring of the cylindrical roller bearing. The cylindrical roller bearing is a non-locating bearing and the four-point bearing also supports axially. The inner rings of both bearings are axially preloaded against each other, so that the four-point ball bearing is a locating bearing in the bearing arrangement.

EP 1 744 069 A1 shows a thrust needle roller bearing with an inner race which is supported on a shaft shoulder and an outer race which sits on a side facing away from the shaft shoulder. The outer disk is held in a form-fitting manner with the inner disk via an axial bearing cage. Alternatively, the inner running disk sits in a housing.

DE 89 00 479 U1 discloses a bearing assembly formed from a cylindrical roller bearing and a thrust roller cage. The inner raceway of the cylindrical roller bearing is shown directly on a shaft. The cage of the axial roller cage is positively connected directly to the outer ring of the cylindrical roller bearing via a snap connection.

In DE 26 00 955 A1 discloses a bearing assembly formed from two needle roller bearings. One of the needle roller bearings is a thrust bearing and another is a radial bearing. The axial bearing has an outer running disk and an inner running disk as well as a plurality of rolling elements rolling between the inner running disk and the outer running disk. The rolling elements are designed as needle rollers and are accommodated in an axial bearing cage. The radial bearing has an outer ring. Needle rollers are arranged between the outer ring and a rolling track formed on a shaft. Sections of the inner running disk bear against an axial end face of the outer ring and is connected to it in a non-detachable, captive manner by means of a press fit and a form-fitting connection.

Another bearing arrangement formed by two needle roller bearings is in DE 10 2009 004 920 B4 disclosed. One of the needle roller bearings is a radial bearing with an inner ring. The other needle bearing is a thrust bearing with an inner race.

The inner race and the inner ring are connected to each other by means of a snap connection.

Out of EP 2 508 767 A1 a bearing arrangement is known which is formed from a ball bearing and a cylindrical roller bearing. The bearing rings of the ball bearing and the cylindrical roller bearing are made of plastic. The ball bearing is a thrust bearing and the cylindrical roller bearing is a radial bearing. The special feature of this bearing is that both bearings have a common bearing ring. In one case, the outer ring of the cylindrical roller bearing has both the rolling raceway for the cylindrical rollers and for the balls of the thrust bearing. The outer disk of the axial bearing is positively connected to the inner ring of the radial bearing. In another case, the outer race of the axial bearing is formed in one piece with the inner ring of the radial bearing. The inner race is supported axially on an end face of the outer ring of the radial bearing.

It is the object of the present invention to propose a combined radial-axial bearing which is characterized by a simple and quick installation.

This object is achieved by a bearing arrangement having the features of claim 1 and by a transmission device. Preferred or advantageous embodiments of the invention result from the dependent claims, the following description and the attached figures.

According to the invention, the axial bearing is designed as an axial needle bearing. The axial needle bearing has an inner running disk, an outer running disk and a plurality of rolling elements which are arranged to roll between the inner running disk and the outer running disk and are designed as needle rollers. The rolling elements are accommodated in an axial bearing cage. On a side facing the ball bearing, the inner running disk rests in sections on an axial end face of the inner ring and is connected to the inner ring via the snap connection. The inner washer and the outer washer are captively connected to the axial bearing cage.

The invention relates to a bearing arrangement which is designed in particular for a transmission device, preferably a vehicle transmission. The bearing arrangement serves to absorb radial and axial loads. The bearing arrangement is designed as a combined axial-radial bearing.

The bearing arrangement has a ball bearing as a radial bearing, which serves to absorb the radial loads. The ball bearing is preferably designed as a grooved ball bearing and has an inner ring and an outer ring as well as a plurality of rolling balls arranged between the inner ring and the outer ring. The balls are preferably accommodated in a ball bearing cage and guided at a distance from one another. The ball bearing cage can be designed as a snap cage or alternatively as a window cage.

The bearing arrangement has an axial bearing which serves to absorb the axial loads. The axial bearing is arranged coaxially to the axis of rotation of the ball bearing.

In the context of the invention, it is proposed that the axial bearing be captively connected to the ball bearing via a snap connection, so that the ball bearing and the axial bearing form a common structural unit. The axial bearing and the ball bearing each form an independently functioning bearing unit. The axial bearing is preferably detachably connected to the ball bearing via the snap connection.

The advantage of the invention is that by attaching the axial bearing to the ball bearing via a snap connection, a particularly simple and cost-effective assembly of the bearing arrangement is implemented. In addition, the bearing unit can be delivered as a preassembled unit, so that the handling of the bearing arrangement is significantly improved during the delivery process and during final assembly. Due to the simple design, the bearing arrangement can also be manufactured inexpensively.

Provision is made for the axial bearing to have an inner running disk, an outer running disk and a plurality of rolling bodies arranged to roll between the inner and outer running disks. The outer running disk is arranged on a side of the axial bearing facing away from the ball bearing and the inner running disk, as already described, is arranged on a side of the axial bearing facing the ball bearing. In particular, the inner running disk can contact the end face of the inner ring over an area, in particular over the entire area. The rolling elements are guided in an axial bearing cage which is arranged captively between the inner running disk and the outer running disk.

The inner race is connected to the inner ring of the ball bearing via the snap connection. In particular, the inner running disc is releasably clipped onto the inner or outer ring via the snap connection. The snap connection can be implemented by a snap hook connection or a ring snap connection. The inner running disk is preferably held on the inner ring in the axial and/or radial direction via the snap connection. The inner running disk and/or the outer running disk can each be designed as a shaped sheet metal component.

In a further specification it is provided that the inner ring or the outer ring has a circumferential snap groove. The snap groove is preferably designed as a continuous annular groove. The snap groove is preferably introduced into the inner ring at the edge. The inner running disk has a snapping section which corresponds to the snapping groove and which engages with the snapping groove at least in sections in order to form the snapping connection. Preferably, at least or precisely the snap-in section for mounting the inner running disk on the inner or outer ring is elastically deformable. In principle, the snap-in section can have a detent lug that runs all the way around, so that the snap-in connection is designed as the ring snap-in connection. However, the snap-in section preferably has a plurality of latching lugs which are spaced evenly apart from one another in the circumferential direction, so that the snap-in connection is in the form of a segmented ring snap connection or snap hook connection is formed.

In a further constructive embodiment it is provided that the inner running disc is Z-shaped viewed in cross section, with a first transverse limb forming the snapping section and a second transverse limb forming a support section for the axial bearing cage for guiding the rolling elements of the axial bearing. In particular, the snap-in section and the support section, viewed in a rough form, are each formed as a cylindrical extension. In particular, the axial bearing cage is supported in the radial direction on the support section and/or is captively held in the axial direction with respect to the axis of rotation, in particular in a form-fitting manner, by the support section. A longitudinal leg connecting the two transverse legs forms an inner run-on section, with the rolling elements rolling on the inner run-on section. In particular, the inner run-on section extends in a radial plane with respect to the axis of rotation, the inner run-on section preferably being designed in the shape of a circular ring. The inner contact section forms a contact surface designed as an annular surface for the rolling bodies.

In a specific development, it is provided that the outer running disk is L-shaped when viewed in cross section, with a longitudinal leg forming an outer contact section, with the rolling bodies rolling on the outer contact section. The outer run-up section extends in a further radial plane in relation to the axis of rotation and/or parallel to the inner run-up section.

A further transverse leg adjoining the further longitudinal leg forms a further support section for the axial bearing cage. In particular, the axial bearing cage is supported on the one hand in the radial direction on one support section and in a radial opposite direction on the other support section. The axial bearing cage is preferably arranged captively between the two support sections. In particular, the inner and outer running disks are each connected to the axial bearing cage via a further snap connection. In particular, the inner running disk and the outer running disk are each positively connected to the axial bearing cage in the axial and/or radial direction, while at the same time a relative rotation of the inner running disk to the outer running disk in the direction of rotation with respect to the axis of rotation is possible.

In a design implementation, it is provided that the inner ring has at least or exactly one inner rim. The inner ring preferably has an inner rim on both sides. In particular, the inner rim forms the part of the inner ring which is adjacent to a raceway of the inner ring and/or serves to guide the ball bearing cage. The snap-in groove is made in an inner board. The snap-in section is thus arranged between the inner ring and the outer ring and/or on a radial outside of the inner ring. Alternatively, the snap groove is made in an inner circumference of the inner ring. Thus, the snap portion is arranged outside of the ball bearing on a radial inside of the inner ring.

In a further design implementation, it is provided that the outer ring has at least or exactly one outboard. The outer ring preferably has an outer rim on both sides. In particular, the outboard forms the part of the outer ring which borders on a raceway, in particular a running groove, of the outer ring and/or serves to guide the ball bearing cage.

The inner rim provided with the snap groove can be extended in the axial direction in relation to the axis of rotation, so that the snap section is arranged at a distance from the ball bearing cage in the axial direction and a collision of the snap section with the ball bearing cage is ruled out. Alternatively or optionally in addition, the inner rim provided with the snap groove can be radially offset at least in sections, so that the snap section is countersunk and a collision of the snap section with the ball bearing cage is ruled out.

In a further embodiment of the invention it is provided that the inner ring has a radially inwardly directed shaft shoulder. In particular, the inner ring can rest on the shaft shoulder in the radial direction on an outer circumference of a shaft and/or in the axial direction on a shaft shoulder of a shaft. An inside diameter of the shaft shoulder is greater than or equal to an inside diameter of the thrust bearing. This ensures that the axial bearing, in particular the inner and/or outer running disk, does not protrude into the bore of the inner ring in the radial direction with respect to the axis of rotation and the inner ring can be pushed completely or unhindered onto the shaft.

Provision is made for the axial bearing to be in the form of an axial needle bearing. The rolling elements are preferably designed as cylindrical rollers, specifically as needle rollers. As needle rollers, the rolling bodies have a length in the radial direction that is at least twice the diameter of the respective rolling body.

Another object of the invention relates to a transmission device with the bearing arrangement tion according to any one of the preceding claims. The transmission device is part of a gear transmission for a vehicle. The transmission device has at least one transmission component and at least one transmission shaft. The transmission component can be designed as the transmission housing, a transmission shaft or a gear wheel.

The bearing arrangement is supported on the transmission shaft and/or on the transmission component in the radial direction in relation to the axis of rotation. The ball bearing is supported on the one hand via the inner ring on the gear shaft and on the other hand with the outer ring on the gear component, such as the gear housing and/or a gear wheel. The bearing arrangement is supported in the axial direction on the gear wheel or gear housing. The bearing arrangement is supported via the axial bearing on the one hand with the outer running disk on the gear wheel and on the other hand with the inner running disk on the inner ring.

• 1 in einer stark schematisierten Darstellung einen Teilausschnitt einer Getriebevorrichtung mit einer Lageranordnung;
• 2 in einer Schnittdarstellung die Lageranordnung aus 1 als ein Ausführungsbeispiel der Erfindung.

Further features, advantages and effects of the invention result from the following description of preferred exemplary embodiments of the invention and the attached figures. show:

• 1 in a highly schematic representation, a partial section of a transmission device with a bearing arrangement;
• 2 in a sectional view of the bearing arrangement 1 as an embodiment of the invention.

1 shows a highly schematic representation of a partial view of a transmission device 1, which can be designed, for example, as an automated manual transmission for a motor vehicle. The transmission device 1 has a bearing arrangement 2 , a transmission component 3 , a transmission shaft 4 and a gear wheel 5 .

The gear wheel 5 is designed, for example, as a spur gear and can be in engagement with another gear wheel, not shown, to form a gear stage. The gear shaft 4 is passed through the gear wheel 5 and is rotatable about an axis of rotation D relative to the gear wheel 5 . The gear wheel 5 is arranged coaxially to the axis of rotation D.

The transmission component 3 is designed, for example, as a transmission housing, with the transmission components, in particular the bearing arrangement 2 and the gear wheel 5, being arranged in the transmission housing. The bearing assembly 2 is used to absorb radial and axial loads and is designed as a combined axial-radial bearing. For this purpose, the bearing arrangement 2 has an axial bearing 6 for absorbing the axial loads and a ball bearing 7 for absorbing radial loads. The bearing arrangement 2 is arranged coaxially to the axis of rotation D, with the ball bearing 7 being supported in the radial direction on the one hand on a radial inner side of the transmission component 3 and on the other hand in a radial opposite direction on an outer circumference of the transmission shaft 4 . In the axial direction with respect to the axis of rotation D, the axial bearing 6 is supported on the gear wheel 5 on the one hand and on the ball bearing 7 in an opposite axial direction on the other hand.

2 shows an exemplary embodiment of the bearing assembly 2 in a sectional view along the axis of rotation D 1 as an embodiment of the invention. The ball bearing 7 is designed as a grooved ball bearing and has an inner ring 8 , an outer ring 9 and a plurality of balls 10 arranged to roll between the inner ring 8 and the outer ring 9 . The balls 10 are guided in a ball bearing cage 11 and are accommodated in the ball bearing cage 11 at a uniform distance from one another circumferentially around the axis of rotation D. The ball bearing cage 11 is designed as a plastic cage, in particular a snap cage. The inner ring 8 has an inner rim 8a, b on both sides and the outer ring 9 has an outer rim 9a, b on both sides. The two inner and outer edges 8a, b; 9a, b each form the part of the inner and outer ring 8, 9 which is arranged outside of the respective raceway, in particular the running groove, and can serve to guide the ball bearing cage 11.

The axial bearing 6 is designed as an axial needle bearing and has an inner running disk 12, an outer running disk 13 and a plurality of rolling elements 14 arranged to roll between the inner and outer running disks 12, 13. The rolling elements 14 are designed as needle rollers, the rolling elements 14 being guided in an axial bearing cage 15 and being accommodated in the axial bearing cage 15 at a uniform distance from one another circumferentially around the axis of rotation D. The axial bearing cage 15 is designed, for example, as a sheet metal cage, in particular a window cage. The inner running disk 12 is arranged on a side of the axial bearing 6 facing away from the ball bearing 7 and the outer running disk 13 is arranged on a side of the axial bearing 6 facing away from the ball bearing 7 . The inner running disk 12 bears against an axial end face of the inner ring 8 in the axial direction and against an outer circumference of the inner ring 8 in the radial direction.

The axial bearing 6 is captively fixed to the inner ring 8 of the ball bearing 7 via a snap connection 16 . For this purpose, the inner disk 12 has a snap section 12a and the ball bearing 7 has a snap groove 17 made in the inner rim 8a of the inner ring 8 . the Snap groove 17 is designed as an encircling annular groove, the snap section 12a being in engagement with the snap groove 17 at least in sections. The inner rim 8a having the snap groove 17 is elongated in the axial direction with respect to the axis of rotation D. This ensures that the snap portion 12a is spaced apart from the ball bearing retainer 11 and collision of the ball bearing retainer 11 with the snap portion 12a is prevented.

The snap-in section 12a is formed by a plurality of latching lugs produced by metal forming, which are regularly spaced apart from one another in the circumferential direction in relation to the axis of rotation D. During assembly, the axial bearing 6 with the inner running disk 12 is slipped onto the inner ring 8 , the latching lugs being elastically deformed and then latching into the snap-in groove 17 .

The inner running disk 12 is Z-shaped when viewed in cross section. A first transverse leg forms the snap-in section 12a, a second transverse leg forms a support section 12c for the axial bearing cage 15, and a longitudinal leg connecting the two transverse legs forms an inner contact section 12b for the rolling elements 14. The inner contact section 12b is designed as an annular disk, with one of the rolling elements 14 facing and in relation to the axis of rotation D in a radial plane extending annular surface forms an inner contact surface for the rolling elements 14. The snap-in section 12a and the support section 12c are at least approximately cylindrical, with the snap-in section 12a adjoining an outer diameter in the axial direction with respect to the axis of rotation D and the support section 12c adjoining an inner diameter of the inner stop section 12b in an opposite axial direction.

The outer running disc 13 is L-shaped when viewed in cross section, with a transverse leg forming a further support section 13a and a longitudinal leg forming an outer run-on section 13b for the rolling elements 14 . The further support section 13a is at least approximately cylindrical and is arranged coaxially and/or concentrically to the support section 12c of the inner running disk 12 . The outer contact section 13b is also designed as an annular disk, with an annular surface facing the rolling elements 14 and extending parallel to the inner contact section 12b in a further radial plane being designed as an outer contact surface for the rolling elements 14 .

The axial bearing cage 15 is supported in the radial direction on the support section 12c of the inner running disk 12 and in a radial opposite direction on the further support section 13a of the outer running disk 13 . On the one hand, the inner running disk 12 is connected captively to the axial bearing cage 15 via the support section 12c and, on the other hand, the outer running disk 13 is connected captively to the axial bearing cage 15 via the further supporting section 13a, so that the outer running disk 13 is fixed in the axial and radial direction in relation to the axis of rotation D and in the direction of rotation relative to the inner running disk 12 is rotatable.

Reference List

1

gear device

2

bearing arrangement

3

transmission component

4

gear shaft

5

gear wheel

6

thrust bearing

7

ball-bearing

8th

inner ring

8a, b

inboards

9

outer ring

9a, b

outboards

10

balls

11

ball bearing cage

12

inner race

12a

snap section

12b

inner run-up section

12c

support section

13

outer wheel

13a

another support section

13b

outer approach section

14

rolling elements

15

thrust bearing cage

16

snap connection

17

snap groove

D

axis of rotation

Claims (7)

Bearing arrangement (2) with a ball bearing (7), the ball bearing (7) having an inner ring (8) and an outer ring (9) and a plurality of balls (10) arranged to roll between the inner ring (8) and the outer ring (9), with an axial bearing (6), wherein the axial bearing (6) with respect to a Rota tion axis (D) is arranged coaxially on an axial end face of the ball bearing (7), characterized in that the axial bearing (6) is captively connected to the ball bearing (7) via a snap connection (16), so that the ball bearing (7) and the Axial bearing (6) form a common structural unit, the axial bearing (6) being designed as an axial needle bearing and an inner running disk (12), an outer running disk (13) and several rolling disks (12) and the outer running disk (13) arranged and as rolling elements (14) in the form of needle rollers, the rolling elements (14) being accommodated in an axial bearing cage (15), and the inner running disc (12) resting in sections on an axial end face of the inner ring (7) on a side facing the ball bearing (7). and is connected to the inner ring (8) via the snap connection (16), and that the inner running disk (12) and the outer running disk (13) are captively connected to the axial bearing cage (15 ) are connected. Bearing arrangement (2) after claim 1 , characterized in that the inner ring (8) has a circumferential snap groove (17), the inner disk (12) having a snap section (12a) which corresponds to the snap groove (17) and which engages with the snap groove (17) at least in sections . Bearing arrangement (2) after claim 1 or 2 , characterized in that the inner running disc (12) is Z-shaped when viewed in cross section, with a first transverse leg forming the snap-in section (12a) and a second transverse leg forming a support section (12c) for an axial bearing cage (15) of the axial bearing (6). , and wherein a longitudinal limb connecting the two transverse limbs forms an inner contact section (12b) for the rolling bodies (14). Bearing arrangement (2) after claim 1 , 2 or 3 , characterized in that the outer running disc (13) is L-shaped when viewed in cross section, with a longitudinal limb forming an outer contact section (13b) for the rolling elements (14) and a transverse limb adjoining the longitudinal limb forming a further support section (12a) for the axial bearing cage (15). Bearing arrangement (2) after claim 2 , characterized in that the snap groove (17) is made in an inner rim (8a, b) of the inner ring (8), or that the snap groove (17) is made in an inner circumference of the inner ring (8). Bearing arrangement (2) according to one of the preceding claims, characterized in that the inner ring (8) has a radially inwardly directed shaft shoulder, an inner diameter of the shaft shoulder being greater than or equal to an inner diameter of the axial bearing (6), and/or that the The outer ring (9) has a radially outwardly directed housing shoulder, with an outside diameter of the housing shoulder being greater than or equal to an outside diameter of the axial bearing (6). Transmission device (1) with the bearing arrangement (2) according to one of the preceding claims, characterized in that the transmission device (1) has at least one transmission component (3), at least one transmission shaft (4) and at least one gear wheel (5), the bearing arrangement (2) is supported in the radial direction in relation to the axis of rotation (D) on the transmission shaft (4) and/or on the at least one transmission component (3) and/or is supported in the axial direction on the gear wheel (5).

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