Combined bearings and transmissions

Abstract

The present invention relates to a combined bearing and a transmission device. The combined bearing comprises a radial bearing and an axial bearing, wherein the radial bearing comprises at least one row of radial bearing rollers (6) and a bearing ring (7), wherein the bearing ring (7) surrounds the radial bearing rollers (6) and forms an outer raceway for the radial bearing rollers (6), wherein the bearing ring (7) is configured with an annular flange extending radially outward at an axial end close to the axial bearing; and the axial bearing comprises at least one row of axial bearing rollers (9) and a first bearing disk, wherein the first bearing disk is arranged on an axial side close to the radial bearing relative to the axial bearing rollers (9), wherein the first bearing disk is radially supported on the annular flange. The transmission device comprises the above-mentioned combined bearing.

Description

Technical Field

[0001] The present invention relates to the field of bearings. Specifically, the present invention relates to a combined bearing comprising a radial bearing and an axial bearing. The present invention also relates to a transmission device having the combined bearing. Background Art

[0002] Combined bearings, in particular, a combination of radial bearings and axial bearings, are often used to support multiple rotating components that rotate relative to each other in a transmission. In combined bearings, there are a large number of embodiments for the mutual support between radial bearings and axial bearings.

[0003] For example, patent document DE 6808806 U discloses a combined bearing comprising a radial bearing and an axial bearing, wherein the outer ring of the radial bearing is used to radially and axially support the bearing race of the axial bearing. In another example, patent application document DE 2047421 A1 discloses a combined bearing comprising a radial bearing and an axial bearing, wherein the bearing race of the axial bearing is radially supported radially inwardly of the outer ring of the radial bearing. However, in both of these embodiments, the combined bearing requires a relatively large axial space, particularly to achieve centering of the axial bearing.

[0004] Patent application DE 3408044 A1 also discloses a combined bearing comprising a radial bearing and an axial bearing, wherein the inner ring of the radial bearing radially supports the retainer of the axial bearing. However, in this solution, while the axial dimensions of the combined bearing are reduced by omitting the bearing race of the axial bearing, the rolling elements of the axial bearing roll directly on two rotating components that rotate relative to each other via the axial bearing. This significantly limits the applicability of the combined bearing, making it particularly unsuitable for operating conditions requiring bearing races. Furthermore, this support method limits the axial distance between the two rotating components to a relatively small range, requiring the provision of combined bearings of corresponding sizes for different operating conditions, resulting in high design and manufacturing costs.

[0005] Patent application DE 102011006290 A1 discloses a combined bearing comprising a radial bearing and an axial bearing, in which one bearing race of the axial bearing is radially supported within a support section of the radial bearing's inner race. Patent application DE 102011079750 A1 supplements the solution of patent application DE 102011006290 A1 by radially supporting the other bearing race of the axial bearing on a radially constricted portion of the radial bearing's outer race, which serves to axially stop the other bearing race. However, the manufacturing costs of both the inner race support section and the outer race radial constriction are high, and this technical solution significantly limits the axial spacing between the two rotating components supported by the axial bearing. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to provide a combined bearing, in particular a combined bearing comprising a radial bearing and an axial bearing, wherein the support and centering of the combined bearing, in particular the axial bearing, are optimized.

[0007] The above technical problem is solved by a combined bearing, which includes a radial bearing and an axial bearing.

[0008] According to a preferred embodiment of the present invention, the radial bearing in the combined bearing has at least one row of radial bearing rollers and bearing rings, wherein the bearing rings surround the radial bearing rollers and form an outer raceway for the radial bearing rollers, wherein the bearing rings are configured with an annular flange extending radially outward at an axial end close to the axial bearing.

[0009] According to a preferred embodiment of the present invention, the axial bearing in the combined bearing has at least one row of axial bearing rollers and a first bearing disk, wherein the first bearing disk is arranged on the axial side close to the radial bearing relative to the axial bearing rollers, and wherein the first bearing disk is radially supported on an annular flange of a bearing ring of the radial bearing.

[0010] Combined bearings can be used in transmissions to support multiple rotating components that rotate relative to one another about a common axis of rotation. Both the radial and axial bearings of the combined bearing can rotate about this common axis of rotation. Throughout this specification, the terms "axial," "radial," and "circumferential" refer to this common axis of rotation unless otherwise specified.

[0011] Advantageously, the radial bearing and the axial bearing of the combined bearing are at least partially arranged offset on the axis. Specifically, at least the axial bearing rollers of the axial bearing are offset or staggered from the radial bearing in the axial direction.

[0012] Preferably, the radial bearing rollers of the radial bearing each have an axis of rotation, wherein the axis of rotation of the radial bearing rollers is parallel to the common axis of rotation. The radial bearing comprises at least one bearing ring serving as an outer ring, the bearing ring having a sleeve section forming an outer raceway for the radial bearing rollers and a radially outwardly extending annular flange, the annular flange being arranged at an axial end of the sleeve section proximal to the axial bearing, particularly the axial bearing rollers. Preferably, the outer circumferential surface of the annular flange is configured as a cylindrical outer circumferential surface, which facilitates stable radial support of the bearing disk of the axial bearing. Furthermore, because the annular flange can support the bearing disk of the axial bearing via only a portion of its outer circumferential surface, the axial spacing between the two rotating components axially supported by the axial bearing can be adjusted within an appropriate range, thus enabling a wide range of applications for the combined bearing. Furthermore, because the annular flange of the bearing ring is easy to manufacture, the combined bearing is relatively low in cost.

[0013] Preferably, the axial bearing rollers of the axial bearing each have an axis of rotation for self-rotation, wherein the axis of rotation of the axial bearing rollers is perpendicular to the common axis of rotation. The axial bearing here has at least one bearing disk, namely a first bearing disk, which is arranged on the axial side of the axial bearing rollers facing the radial bearing. Advantageously, the first bearing disk is basically configured as an annular disk. Here, the first bearing disk can advantageously be configured as an adjustment washer or a bearing race or a thrust race. "Basically configured as an annular disk" here means, in particular, that when the first bearing disk is configured as a thrust race, it can optionally be configured with a sleeve-shaped section for radial support. Here, preferably, the first bearing disk is radially supported on the annular flange of the bearing ring of the radial bearing with its inner circumferential surface so that it can slide relative to or cannot slide relative to each other.

[0014] In one embodiment, the transmission device includes at least a first rotating component and a second rotating component. Preferably, the first rotating component may include a shaft portion and a flange portion that are non-rotatably connected, for example, fixedly connected or integrally constructed. Here, the shaft portion of the first rotating component is arranged radially inwardly of the radial bearing, and the flange portion of the first rotating component is axially arranged on the axial side of the axial bearing away from the radial bearing. Here, the second rotating component surrounds the radial bearing and is radially supported on the shaft portion of the first rotating component by the radial bearing so as to be relatively rotatable, and the second rotating component is axially supported on the flange portion of the first rotating component by the axial bearing so as to be relatively rotatable. Here, the first rotating component and / or the second rotating component may be separate components or an assembly consisting of multiple separate components non-rotatably connected.

[0015] In another embodiment, the transmission device includes at least a first rotating component, a second rotating component and a third rotating component. Here, the first rotating component, the second rotating component and the third rotating component can rotate relative to each other in pairs around a common rotation axis. Here, the first rotating component is preferably configured as a shaft and is arranged on the radial inner side of the radial bearing. The third rotating component is arranged on the axial side of the axial bearing away from the radial bearing in a manner that is rotatable relative to the first rotating component. The second rotating component surrounds the radial bearing and is supported radially on the first rotating component by the radial bearing so as to be relatively rotatable, and the second rotating component is supported axially on the third rotating component by the axial bearing so as to be relatively rotatable. Here, the first rotating component, the second rotating component and / or the third rotating component can be separate components or assemblies composed of multiple separate components that are non-rotatably connected.

[0016] In an advantageous embodiment, the first bearing disk is designed as a bearing raceway that forms the raceway for the axial bearing rollers. The bearing raceway is radially supported with its inner circumferential surface on an annular flange of the bearing ring of the radial bearing, either slidably or non-slidably. This ensures reliable radial support of the bearing disk of the axial bearing and stably achieves a centered arrangement of the axial bearing.

[0017] In another advantageous embodiment, a second bearing disk is arranged between the first bearing disk and the axial bearing rollers, wherein the first bearing disk is configured as an adjustment washer, and the second bearing disk is configured as a bearing raceway forming a raceway for the axial bearing rollers. The adjustment washer can be used to adjust the axial spacing between two rotating components supported by the axial bearing, thereby extending the range of applications for the combined bearing according to this embodiment.

[0018] Here, the second bearing disk is preferably supported radially on an annular flange of the bearing ring of the radial bearing. In this case, the first bearing disk constituting the adjusting washer and the second bearing disk constituting the bearing race are both supported radially on an annular flange formed on the bearing ring of the radial bearing, thereby stably achieving centering of the axial bearing.

[0019] Here, alternatively, only the first bearing disc is supported radially on the annular flange of the bearing ring of the radial bearing.In this case, the second bearing disc does not directly abut on the annular flange of the bearing ring of the radial bearing.

[0020] In another advantageous embodiment, the axial bearing further comprises a third bearing disk, wherein the third bearing disk is arranged on the axial side facing away from the radial bearing relative to the axial bearing rollers, wherein the third bearing disk is designed as a bearing raceway forming a raceway for the axial bearing rollers. The third bearing disk can optionally be designed with a sleeve-like section for radial support.

[0021] Here, preferably, the radial bearing is supported on its radial inner side on a rotating component, in particular a first rotating component, and the third bearing disk is supported directly or indirectly on the rotating component, in particular the first rotating component, in particular via its sleeve-shaped section. "Indirect support" here means, for example, that the third bearing disk is supported radially on another rotating component, in particular via its sleeve-shaped section, and that the other rotating component is in turn supported radially on the first rotating component, either radially rotatable relative to the first rotating component or non-rotatable relative to the first rotating component.

[0022] In another advantageous embodiment, the radial bearing further comprises an additional bearing ring, the additional bearing forming an inner raceway for the radial bearing rollers. In other words, the radial bearing optionally comprises an inner ring, which can be mounted on the first rotating component.

[0023] In another advantageous embodiment, the radial bearing rollers are configured as needle rollers. Preferably, the ratio of the axial length to the diameter (D / M) of the needle rollers is greater than or equal to 2.5. This allows the radial bearing to be installed in installation spaces with very small radial dimensions.

[0024] In another advantageous embodiment, the axial bearing rollers are configured as needle rollers. Preferably, the ratio of the axial length to the diameter (D / M) of the needle rollers is greater than or equal to 2.5. This allows the axial bearing to be installed in installation spaces with very small axial dimensions.

[0025] The above technology can also be solved by a transmission device having a combined bearing constructed according to the above embodiment to support a plurality of rotating members that can rotate relative to each other in the transmission device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] A preferred embodiment of the present invention is schematically described below with reference to the accompanying drawings.

[0027] Figure 1 is a schematic diagram of a combined bearing according to a preferred embodiment. DETAILED DESCRIPTION

[0028] Figure 1 A schematic diagram illustrates a combined bearing according to a preferred embodiment of the present invention. The combined bearing comprises a radial bearing and an axial bearing. In this embodiment, both the radial bearing and the axial bearing are configured as needle roller bearings. In other words, the combined bearing is configured as a combined needle roller bearing.

[0029] In this embodiment, a combined bearing is used to rotatably support multiple rotating components of a transmission. Specifically, the transmission includes a first rotating component 1, second rotating components 2, 3, and a third rotating component 4, all rotatable about a common rotation axis. The first rotating component 1 is configured as a shaft. The second rotating component is configured as an assembly consisting of two components 2, 3 connected to each other in a rotationally fixed manner. The third rotating component 4 is radially supported on the first rotating component 1 by means of an additional rotating component 5. The additional rotating component 5 is fixedly connected to the third rotating component 4 and the first rotating component 1, respectively, for example, by press fit.

[0030] The radial bearing has a row of radial bearing rollers 6 and a bearing ring 7 serving as an outer ring. The bearing ring 7 comprises a sleeve section and an annular flange. The sleeve section of the bearing ring 7 surrounds the radial bearing rollers 6 and forms an outer raceway for the radial bearing rollers 6. The annular flange extends radially outward from the axial end of the sleeve section, which is adjacent to the axial bearing.

[0031] The axial bearing comprises a first bearing disc 11, a second bearing disc 10, a row of axial bearing rollers 9, and a third bearing disc 8, arranged axially from the side of the second rotating components 2 and 3 (i.e., the radial bearing side) toward the side of the third rotating component 4. In this embodiment, the second bearing disc 10 and the third bearing disc 8 are each configured as a bearing race. The second bearing disc 10 and the third bearing disc 8 each form a raceway on the side facing the axial bearing rollers 9 and form a sleeve-like section for radial support. In this embodiment, the first bearing disc 11 is configured as an adjustment washer.

[0032] like Figure 1 As shown, the first rotating component 1 is arranged radially inwardly of the radial bearing and forms the inner raceway for the radial bearing rollers 1, i.e., needle rollers. The second rotating components 2 and 3 are mounted on the outer circumference of the radial bearing's bearing ring 7, for example, by press-fitting. This allows the second rotating components 2 and 3 to be radially supported on the first rotating component 1 via the radial bearing, allowing for relative rotation. The third bearing disk 8 of the axial bearing is radially supported on the other rotating component 5 via its sleeve-shaped section. The first bearing disk 11 serves as an adjustment spacer and is arranged axially between the second rotating components 2 and 3 and the second bearing disk 10 to adjust the axial spacing between the second rotating components 2 and 3 and the third rotating component 4. The first bearing disk 11 is radially supported with its inner circumferential surface on the annular flange of the bearing ring 7, either slidably or non-slidably. This allows for stable centering of the axial bearing even in very confined space. Furthermore, the ease of manufacturing of the annular flange of the bearing ring 7 contributes to the low cost of the combined bearing.

[0033] Although possible embodiments have been described by way of example in the above description, it should be understood that there are still a large number of variations of embodiments by combining all known and other technical features and embodiments that are readily conceivable to a skilled person. It should also be understood that the exemplary embodiment is merely an example and that such an embodiment in no way limits the scope of protection, application and construction of the present invention in any form. The foregoing description is more of a technical guide for the skilled person to transform at least one exemplary embodiment, wherein various changes may be made, in particular with respect to the functionality and structure of the components, without departing from the scope of protection of the claims. In addition, the terms "first", "second", etc. are only used to describe distinguishing components and are not to be understood as indicating or implying relative importance. For example, the presence of a "third bearing disc" does not indicate or imply the necessary presence of a "second bearing disc".

[0034] Reference Signs List

[0035] 1 First rotating member

[0036] 2 Components of the second rotating member

[0037] 3 Components of the second rotating member

[0038] 4 Third rotating member

[0039] 5 Additional rotating components

[0040] 6 radial bearing rollers

[0041] 7 Bearing rings

[0042] 8 First bearing disc

[0043] 9 Axial bearing rollers

[0044] 10 Second bearing disc

[0045] 11 Third bearing disc

Claims

1. A combined bearing comprising a radial bearing and an axial bearing, characterized in that: The radial bearing comprises at least one row of radial bearing rollers (6) and a bearing ring (7), wherein the bearing ring (7) surrounds the radial bearing roller (6) and forms an outer raceway for the radial bearing roller (6), The bearing ring (7) is provided with an annular flange extending radially outward at an axial end portion close to the axial bearing; The axial bearing has at least one row of axial bearing rollers (9) and a first bearing disk, The first bearing disc is arranged on the axial side close to the radial bearing relative to the axial bearing roller (9). The outer peripheral surface of the annular flange is configured as a cylindrical outer peripheral surface, and the first bearing disk is supported radially on the annular flange with its inner peripheral surface in a relatively slidable or non-slidable manner.

2. The combined bearing according to claim 1, characterized in that: The first bearing disk is configured as a bearing raceway forming a raceway for the axial bearing rollers (9).

3. The combined bearing according to claim 1, characterized in that: A second bearing disc is arranged between the first bearing disc and the axial bearing roller (9), Wherein, the first bearing disc (11) is configured as an adjusting washer, The second bearing disk (10) is configured as a bearing raceway forming a raceway of the axial bearing roller (9).

4. The combined bearing according to claim 3, characterized in that: The second bearing disk is supported radially on the annular flange.

5. The combined bearing according to claim 1, characterized in that: The axial bearing further comprises a third bearing disk, wherein the third bearing disk is arranged on an axial side remote from the radial bearing relative to the axial bearing rollers (9), wherein the third bearing disk (8) is configured as a bearing raceway forming a raceway for the axial bearing rollers (9).

6. The combined bearing according to claim 5, characterized in that: The radial bearing is supported on a rotating component at its radial inner side, and the third bearing disk is directly or indirectly supported on the rotating component.

7. The combined bearing according to claim 1, characterized in that: The radial bearing also has a further bearing ring, which forms the inner raceway for the radial bearing rollers (6).

8. The combined bearing according to claim 1, characterized in that: The radial bearing rollers (6) are configured as needle rollers.

9. The combined bearing according to claim 1, characterized in that: The axial bearing rollers (9) are designed as needle rollers.

10. A transmission having a combined bearing according to any one of the preceding claims 1 to 9.

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