DE102018131105A1 - Bearing arrangement and vehicle transmission with the bearing arrangement - Google Patents

Abstract

Technical processes or components of any kind cause noise in a gearbox, e.g. B. gear noise, noises from switching systems, loose part rattles or the like. Machine noise is caused by periodic excitation mechanisms. These lead to direct and indirect noises in the form of airborne noise. In the direct route, an excitation source immediately causes fluctuations in air pressure, which can spread in the form of airborne noise. For the noise behavior of gearboxes, the indirect route can largely be regarded as decisive. In this indirect vibration transmission, a time-varying operating force is introduced into a machine structure, where it is transmitted in the form of structure-borne noise to the surface that emits the airborne noise. The object of the invention is to define a measure which minimizes the transmission of noise in a vehicle transmission. For this purpose, a bearing arrangement 1 is proposed with a first bearing partner 4a and a second bearing partner 4b, with a bearing device 5, the bearing device 5 being stored between the first and the second bearing partner 4a, b is arranged, with a locking ring 7a, b, the locking ring 7a, b being fixed in the axial direction on one of the bearing partners 4a, b and abutting on the bearing device 5 in order to fix it in the axial direction, wherein the securing ring 7a, b has at least one plastic section 9a, b, the securing ring za, b with the plastic section 9a, b abutting the bearing device 5.

Description

The invention relates to a bearing arrangement with the features of the preamble of claim 1. The invention further relates to a vehicle transmission with the bearing arrangement.

Technical processes or components of any kind cause noise in a gearbox, e.g. B. gear noise, noise from switching systems, loose part rattles or the like. Machine noise is caused by periodic excitation mechanisms. These lead to direct and indirect noises in the form of airborne noise. In the direct route, an excitation source immediately causes fluctuations in air pressure, which can spread in the form of airborne noise. For the noise behavior of gearboxes, the indirect route can largely be regarded as decisive. In this indirect vibration transmission, a time-varying operating force is introduced into a machine structure, where it is transmitted in the form of structure-borne noise to the surface that emits the airborne noise

The transmission of structure-borne noise from the source through the gear structure to the housing can be modeled using a structure-borne noise transmission chain, also referred to as a transfer path. The structure-borne sound transmission chain can be represented simply as a spring-mass system. This model presentation is shown below using the example of the toothing noise phenomenon: A basic function of the toothing is the transmission of drive power between two shafts. If you look at the input shaft, there is a moment here that should be transferred to the output shaft via the toothing. An equilibrium of forces is formed in the gearing during power transmission. The drive line is transmitted via the tangential force component in tooth contact. Due to the toothed slopes, the balance of forces extends across all three spatial directions.

When transmitting the drive power, the drive torque is therefore supported on the housing via the teeth in the radial, tangential and axial directions. The support to the housing is provided by several components, including over waves and bearings. The entire chain of support components can be modeled as a spring-mass system. So is the chain of components that transmit the drive power.

• ■ Torsionsschwingungen (ϕX)
• ■ Axiale Schwingungen (X)
• ■ Radial Pusationen (Y, Z)
• ■ Kippschwingungen (ϕY & ϕZ)

The spring-mass systems of support in the axial, radial and power transmission in the tangential direction are connected in tooth contact. Depending on the form of excitation and the different stiffnesses of the vibration system, various vibration forms are evident in the gearbox. These can be translational as well as rotary. It refers to:

• ■ torsional vibrations (ϕX)
• ■ axial vibrations (X)
• ■ Radial pusations (Y, Z)
• ■ Tilting vibrations (ϕY & ϕZ)

It is known from the prior art to arrange plastic parts in gearboxes in order to fix and / or damp various components.

The publication DE 2104452 A1 relates, for example, to an arrangement for holding a bearing, the bearing being supported radially and axially via a continuous plastic ring and at the same time being damped. The plastic ring acts as a damping element for frequencies in the order of a few kHz.

The publication DE 2625731 A1 relates, for example, to a roller bearing and cover attachment, the attachment being carried out via a retaining ring made of plastic.

The publication DE 3711359 A1 relates to the problem area that damping the sound radiation as structure-borne sound or as airborne sound from wheels, in particular from gearwheels, known damping means are arranged in such a way that they dampen both the radial vibrations causing the sound and the axial vibrations. The damping means is designed, for example, as a disk or as part of a disk.

The publication DE 100 07 437 A 1 relates to a method for fixing at least one bearing in a bearing seat and a bearing arrangement produced therewith. The bearing has a bearing ring, an exception being arranged in a corner region on the outer circumference and an elastic element being arranged in the exception. The elastic element can be applied to the bearing as a shaped body, in liquid or pasty form, or can be vulcanized, for example.

The publication DE 10 2007 031 325 A1 relates to a bearing device, the bearing device being fixed via a plastic snap ring, the snap ring being arranged exclusively on the outer circumference of an outer ring of the bearing device.

The publication EP 0 147 372 A2 relates to a bearing device, the bearing device being supported in the radial direction via a continuous elastic ring.

The publication EP 473307 B1 ultimately relates to a bearing arrangement with a bearing and with an additional, elastic ring, the elastic ring being arranged coaxially with the bearing.

The invention has for its object to define a measure that reduces the noise transmission in a vehicle transmission. This object is achieved by a bearing arrangement with the features of claim 1 and by a vehicle transmission with the features of claim 8. Preferred or advantageous embodiments of the invention result from the subclaims, the description below and the attached figures.

The invention relates to a bearing arrangement which is particularly suitable and / or designed for a transmission, in particular for a vehicle transmission. The bearing arrangement has a first bearing partner and a second bearing partner. Furthermore, the bearing arrangement has a bearing device, the first bearing partner being mounted relative to the second bearing partner via the bearing device. The bearing device preferably has a main axis, the first bearing partner rotating about the main axis relative to the second bearing partner. For example, the bearing partners are arranged coaxially and / or concentrically with one another. The bearing device is particularly preferably arranged coaxially and / or concentrically to the main axis and also between the first and second bearing partners.

The bearing arrangement has a locking ring for axially securing the bearing device on one of the bearing partners. This bearing partner particularly preferably has a securing groove which runs all around the main axis. The locking ring may be inserted in the locking groove. This secures the locking ring on this bearing partner in the axial direction. The retaining ring is preferably designed as a ring which is simply interrupted in the direction of rotation. Due to the interruption in the circumferential direction, the locking ring can be temporarily and / or elastically changed in diameter during assembly, so that it can be expanded for assembly via a bearing partner and reduced in outside diameter for assembly in a bearing partner.

The retaining ring is preferably in direct and / or physical contact with the bearing device in order to fix it in the axial direction. As a result, the bearing device can be supported on the securing ring in the axial direction. The bearing device is particularly preferably supported exclusively in the axial direction on the retaining ring. Thus, there is particularly preferably no power transmission in the radial direction between the retaining ring and the bearing device.

In the context of the invention, it is proposed that the securing ring has at least one plastic section, the securing ring with the plastic section abutting the bearing device. In particular, the plastic section contacts the bearing device directly and / or physically.

It is a consideration of the invention that vibrations, vibrations etc. previously described can be effectively damped by the plastic section. This significantly improves the NVH behavior of transmissions, especially vehicle transmissions. By integrating the plastic section into the locking ring to dampen the bearing device, the invention can be implemented in a very space-saving manner.

In one possible embodiment of the invention, the locking ring is designed as a solid material ring made of plastic. For example, the locking ring can be produced by means of plastic injection molding. This allows the locking ring to be produced at particularly low cost. With the solid material ring, there is a first impedance transition between the bearing device and the circlip and a second impedance transition between the circlip and the bearing partner.

In an alternative embodiment of the invention, the locking ring has a supporting body made of metal, on which the plastic section is fixed. In particular, the locking ring is made in one piece and / or in one piece with the supporting body. For example, the support body and the plastic section can be connected to one another in a form-fitting and / or integral manner.

In a preferred implementation of the invention it is provided that the plastic section encompasses the support body. In particular, the plastic section is designed as a partial ring which is interrupted in the circumferential direction. In a cross section through the partial ring, it has a groove, the support body being inserted in the groove. With a free ring area, the support body can engage in the bearing partner and be supported axially; the plastic section is arranged on a further ring area.

In a particularly preferred embodiment of the invention, the bearing device is designed as a roller bearing device. Forces are transmitted in the roller bearing so that vibrations, in particular vibrations, can potentially arise here. The fact that the locking ring with the plastic section directly adjacent to is arranged as a rolling bearing device, these oscillations or vibrations can be damped locally.

In a preferred embodiment of the invention, the bearing device has at least one pressure line, the pressure line being oriented exclusively radially. Thus, only radial forces are transmitted via the bearing device. Nevertheless, it is advantageous to position a correspondingly designed locking ring with the plastic section axially adjacent to the bearing device, since these do not actually absorb any axial forces statically, but in dynamic cases, axial forces can still occur which lead to oscillation and / or vibration, which can be dampened by the plastic section.

In an alternative embodiment of the invention, the bearing device has at least one pressure line, the pressure line also being axially aligned and / or having an axial component. In particular, the rolling bearing device is designed as an axial bearing or as an axial radial bearing. In this embodiment, forces and moments are (also) transmitted in the axial direction so that the locking ring is in the flow of force and can dampen vibrations, in particular vibrations.

Another object of the invention relates to a vehicle transmission for guiding a main drive torque of the vehicle. The main driving torque is the driving torque that drives the vehicle. It is provided that the vehicle transmission has at least one of the bearing arrangements described above. In particular, the vehicle is designed as a passenger car, truck or bus.

In a preferred development of the invention, it is provided that one of the bearing partners transmits or at least supports the main drive torque. For example, one of the bearing partners can be designed as a motor shaft, rotor shaft, input shaft, output shaft, etc.

In a particularly preferred embodiment of the invention, the vehicle transmission has an interface for coupling an electric motor to provide the main drive torque. The electric motor optionally forms part of the vehicle transmission. In particular, the vehicle transmission with the electric motor is designed as an electrical axis for the vehicle.

• 1 eine schematische Längsschnittdarstellung einer Lageranordnung für ein Fahrzeuggetriebe als ein erstes Ausführungsbeispiel der Erfindung;
• 2 eine schematische Längsschnittdarstellung einer Lageranordnung für ein Fahrzeuggetriebe als ein zweites 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. These show:

• 1 is a schematic longitudinal sectional view of a bearing arrangement for a vehicle transmission as a first embodiment of the invention;
• 2nd is a schematic longitudinal sectional view of a bearing arrangement for a vehicle transmission as a second embodiment of the invention.

The 1 shows in a schematic longitudinal section along a major axis H a bearing arrangement 1 for a vehicle transmission 2nd , the vehicle transmission 2nd is only shown schematically as a block. In particular, the bearing arrangement forms 1 a section in a powertrain that is through the vehicle transmission 2nd is implemented, the vehicle transmission 2nd and / or the drive train converts a main drive torque for the vehicle. For example, the vehicle transmission has an electric motor 3rd on, the electric motor 3rd the main drive torque is generated and via the vehicle transmission 2nd directs. The electric motor 3rd is through an interface 11 tied up. The main drive torque is via the bearing arrangement 1 passed, at least the main drive torque is via the bearing arrangement 1 supported.

The bearing arrangement 1 has a first and a second warehouse partner 4th a , b on, being the first warehouse partner 4a is designed, for example, as a shaft, such as a motor shaft, rotor shaft, input shaft, output shaft, intermediate shaft, countershaft, sun shaft, etc. The second warehouse partner 4b is, for example, as a surrounding construction, such as a housing, a housing section or another stationary area in the vehicle transmission 2nd educated. It is planned that the first warehouse partner 4a around the main axis H relative to the second warehouse partner 4th b turns.

The first warehouse partner 4th a is about a storage facility 5 towards the second warehouse partner 4th b stored. The storage facility 5 is designed as a rolling element bearing device and can be implemented, for example, as a ball bearing as shown here. It is also possible that the storage facility 5 is designed as a multi-row roller bearing or as another roller bearing, such as a roller bearing, tapered roller bearing, barrel roller bearing, cylindrical roller bearing, etc. In the illustrated embodiment, the storage device 5 designed as a pure radial bearing, with a pressure line D runs exclusively in the radial direction. In an alternative embodiment of the invention, the pressure lines D also angled to the main axis H or parallel to the main axis H be formed, in other words, the storage device 5 can also be designed as an axial radial bearing or as a pure axial bearing.

The storage facility 5 has an inner ring 6a and an outer ring 6b on. The Rings 6a , b lie in the axial direction of the main axis H on the one hand on a shoulder heel, which is made from the base material of the warehouse partner 4th a , b is formed. On the opposite side, the rings are each on a locking ring 7 a , b immediately and / or physically. The circlips 7 a , b are opened once in the direction of circulation, so that this applies to the first warehouse partner 4th a snapped and into the second warehouse partner 4th b can be snapped.

The circlips 7 a , b are each in a securing groove 8th a , b , so that these each form-fit in both axial directions through the groove walls of the securing groove 8th a , b are supported. This is the storage facility 5 through the circlips 7 a , b positively secured in both axial directions.

At least one of the locking rings 7 a , b preferably both circlips 7 a , b are designed as solid material rings. The material used is plastic, in particular a rigid plastic. The circlips are now in place 7 a , b each with a plastic section 9 a , b physically and / or directly at the storage facility 5 at.

The circlips 7 a , b made of plastic are dimensioned so that they, on the one hand, the axial load from the bearing device 5 can support. Second, take the circlips 7 a , b made of plastic to dampen vibrations, in particular vibrations as described above, and thereby the NVH behavior (noise, vibration, harshness) of the vehicle transmission 2nd to improve.

In the 2nd A second exemplary embodiment is shown, the same components as in FIG 1 have been provided with the same reference numerals. For these components, refer to the description of the 1 referred.

In contrast to the first embodiment in the 1 is the locking ring 7 b Although realized in one piece, it has several areas. The locking ring 7 b has a supporting body 10th on, with the supporting body 10th is made of metal and is realized as a circumferential, once interrupted ring, so that it forms a basic securing ring. The supporting body 10th lies in the securing groove 8b and supports the snap ring 7b in both axial directions. The locking ring 7 b points the plastic section 9 b on, the plastic section 9 b the supporting body 10th embraces in a U-shape. As a whole, the plastic section 9 b formed as a once interrupted ring, which has a groove for receiving the support body 10th having. The connection between the support body 10th the plastic section 9 b can for example be cohesive. This formation of the circlip 7b has the advantage that the support in the axial direction by the metallic support body in particular 10th is significantly more stable than in the embodiment in the 1 . Nevertheless, through the plastic section 9 b damping of vibrations, in particular vibrations, can be effectively implemented. The locking ring 7b can also be in the position of the circlip 7a be used and replace it.

Reference symbol list

1

Bearing arrangement

2nd

Vehicle transmission

3rd

Electric motor

4a, b

Warehouse partner

5

Storage facility

6a

Inner ring

6b

Outer ring

7a, b

Circlip

8a, b

Securing groove

9a, b

Plastic section

10th

Supporting body

11

interface

D

Pressure lines

H

Main axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included 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.

Patent literature cited

• DE 2104452 A1 [0007]
• DE 2625731 A1 [0008]
• DE 3711359 A1 [0009]
• DE 10007437 A [0010]
• DE 102007031325 A1 [0011]
• EP 0147372 A2 [0012]
• EP 473307 B1 [0013]

Claims (10)

Bearing arrangement (1) with a first bearing partner (4a) and a second bearing partner (4b), with a bearing device (5), the bearing device (5) being arranged between the first and the second bearing partner (4a, b), with a Locking ring (7a, b), the locking ring (7a, b) being fixed in the axial direction on one of the bearing partners (4a, b) and abutting on the bearing device (5) in order to fix it in the axial direction, characterized in that the locking ring (7a, b) has at least one plastic section (9a, b), the locking ring (za, b) with the plastic section (9a, b) bearing against the bearing device (5). Bearing arrangement (1) after Claim 1 , characterized in that the locking ring (7a, b) is designed as a solid material ring made of plastic. Bearing arrangement (1) after Claim 1 or 2nd , characterized in that the locking ring (7a, b) has a supporting body (10) made of metal, on which the plastic section (9a, b) is fixed. Bearing arrangement (1) after Claim 3 , characterized in that the plastic section (9a, b) engages around the support body (10) on both sides. Bearing arrangement (1) according to one of the preceding claims, characterized in that the bearing device (5) is designed as a roller bearing device. Bearing arrangement (1) according to one of the preceding claims, characterized in that the bearing device (1) is designed as a radial bearing. Bearing arrangement (1) according to one of the preceding Claims 1 to 5 , characterized in that the bearing device (5) is designed as an axial bearing or as an axial radial bearing. Vehicle transmission (2) for guiding a main driving torque of the vehicle, characterized by the bearing arrangement (1) according to one of the preceding claims. Vehicle transmission (2) after Claim 8 , characterized in that at least one of the bearing partners (4a, b) transmits or supports the main drive torque. Vehicle transmission (2) after Claim 8 or 9 , characterized in that the vehicle transmission (2) has an interface for coupling an electric motor (3) to provide the main drive torque.

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