Gear assembly with damping device

Abstract

The invention relates to a gear assembly (10) for transmitting a torque between outer teeth (16) and inner teeth (24), comprising an outer ring (14) which can be rotated about an axis of rotation (12) and which has outer teeth (16), a damping device (18) which can provide a spring force, and an inner ring (22) which is arranged concentrically to the outer ring (14) radially inside the outer ring (14) and which has inner teeth (24) and which can be rotated in a limited manner relative to the outer ring (14) against the spring force, the gear assembly (10) further comprises at least one first side element (30) which is rigidly connected to the outer ring (14), and a friction device (34) which can act in a frictional engagement between the first side element (30) and the inner ring (22), the friction device (34) having at least one friction ring (40) and at least one axial spring element (38) which can exert an axial spring force on the friction ring (40).

Description

Technical Field

[0001] The present invention relates to a gear assembly as described in the preamble of claim 1. Background Technology

[0002] DE102019123142A1 illustrates a gear assembly having an outer ring, an inner ring, and an elastomeric damping device that acts between the outer and inner rings. Summary of the Invention

[0003] The technical problem to be solved by this invention is to reduce the meshing noise of gear assemblies. At the same time, the gear assembly has a compact structure and low cost.

[0004] At least one of the technical problems can be solved by a gear assembly having the features of claim 1. This reduces meshing noise caused by gear backlash between the gear assembly and its connecting parts that are connected by meshing teeth, especially noise caused by load variations when transmitting torque.

[0005] This gear assembly can be arranged in the transmission of a vehicle, particularly a motor vehicle. The torque transmitted through this gear assembly can be the driving torque used for vehicle propulsion. This driving torque can be provided by the vehicle's drive elements, particularly an electric motor and / or an internal combustion engine.

[0006] The outer ring may at least partially overlap the inner ring axially. The external teeth may at least partially overlap the internal teeth axially. The outer ring may be designed as a gear ring. The external teeth may be helical or spur teeth. To transmit torque, the external teeth may engage with connecting components via tooth meshing.

[0007] The inner ring may be equipped with a fluid guiding device for supplying lubricant, particularly oil, to the damping and / or friction devices. This fluid guiding device may have oil grooves, particularly in the internal gear region. The oil grooves may be continuous or discontinuous in the circumferential direction. The fluid guiding device may include through-holes, particularly within the inner ring, between the internal teeth and the outer circumferential surface of the inner ring. The internal teeth may be helical or spur teeth. The inner ring may be designed as an output hub. The inner ring is rotatable about a rotating axis. To transmit torque, the internal teeth may engage with connecting components (e.g., shafts) via tooth meshing.

[0008] The damping device can have at least one energy storage element, particularly a helical spring. To generate spring force, the energy storage element can abut one end against the outer ring and the other end against the inner ring. The outer ring and / or the inner ring can have a working surface for abutting against the energy storage element. Depending on the direction of torque transmission, the outer ring can be the damping input or damping output of the damping device, while the inner ring can be the damping output or damping input of the damping device.

[0009] The damping device plays a role in the transmission of torque between the outer and inner rings. This torque can be transmitted through the damping device.

[0010] The damping device can have an overload protection mechanism to protect at least one energy storage element. When the overload torque is exceeded, the torque exceeding the overload torque can bypass at least one energy storage element and be transmitted between the outer and inner rings. The overload protection can be achieved through contact between the inner and outer rings.

[0011] The first side element can be a side plate. The first side element can abut axially against the radial boss of the outer ring. The first side element can also be integrally formed with the outer ring.

[0012] The friction device can limit the relative rotation between the inner and outer rings through frictional force. This frictional force can work in parallel with the spring force to counteract the relative rotation between the inner and outer rings.

[0013] The axial spring element can include at least one disc spring, or be a disc spring itself. The axial spring element can be preloaded in the friction device. The frictional force can be adjusted by the axial spring element. The axial spring element can be axially arranged between the inner ring and the friction ring, or between the friction ring and the first side element. The axial force can preload the friction ring axially, particularly towards the first side element.

[0014] In one embodiment of the invention, the friction element is preferably capable of overcoming the axial spring force and making limited axial movement relative to the inner ring. The friction element can overcome the axial spring force of the axial spring element in a first axial direction and make limited movement relative to the inner ring. Within the movement clearance range of the axial spring element, the friction element can make limited movement relative to the inner ring in a second axial direction opposite to the first axial direction, assisted by the axial spring force of the axial spring element.

[0015] The maximum displacement in the first axial direction can be limited by a stop device. This stop device can be installed between the friction ring and the inner ring. Therefore, the axial spring element can be prevented from being subjected to excessive force when displaced in the first axial direction.

[0016] In a preferred embodiment of the invention, the friction ring is preferably frictionally engaged with the first side element. The friction ring and the axial spring element can be relatively fixed and non-rotatable. The friction ring and the inner ring can also be relatively fixed and non-rotatable.

[0017] The friction ring can form a first abutment area with the first side element. This first abutment area can be located radially inside the radial extension of the axial spring element.

[0018] In a particular embodiment of the invention, the axial spring element is preferably supported at one end on the inner ring and at the other end on the friction ring. The friction ring may have a centering flange for centering the axial spring element. The axial spring element may abut against the friction ring radially inward and against the inner ring radially outward, or vice versa.

[0019] In a preferred embodiment of the invention, the gear assembly further includes at least one second side element fixedly connected to the outer ring, the second side element being located on the side axially opposite to the damping device and the first side element, and a second friction device having at least one other friction ring is provided, capable of providing friction between the second side element and the inner ring. The other friction device can limit the relative rotation between the inner and outer rings through frictional force.

[0020] The second side element can be a side plate. The second side element can axially abut against the radial boss of the outer ring. The second side element can also be designed as an integral part of the outer ring.

[0021] In the first direction of rotation (e.g., traction operation), the frictional force of the other friction device can increase as the torque on the inner or outer ring increases. In the second direction of rotation opposite to the first direction of rotation (e.g., pushing operation), the frictional force of the friction device can increase as the torque on the inner or outer ring increases.

[0022] In a particular embodiment of the invention, another friction ring is preferably frictionally engaged with the second side element. The other friction ring can form a second abutment region with the second side element. The second abutment region can be located radially outside, radially inside, or at least partially overlap the first abutment region radially. The second abutment region can be arranged to at least partially overlap the axial spring element radially. The second abutment region can be arranged radially inside the damping device.

[0023] In a particular embodiment of the invention, another friction ring is preferably frictionally engaged with the inner ring. The other friction ring can form a third abutment region with the inner ring. The third abutment region can be located radially outside, radially inside, or at least partially radially overlapping the first and / or second abutment regions. The third abutment region can at least partially radially overlap with the axial spring element. The third abutment region can be located radially inside the damping device.

[0024] In a preferred embodiment of the invention, another friction device has at least one additional axial spring element that applies an axial force to another friction ring. This additional axial spring element may include at least one additional disc spring. This additional disc spring may be axially arranged between the second side element and the other friction ring, or between the other friction ring and the inner ring.

[0025] In a preferred embodiment of the invention, the damping device is preferably arranged axially between the friction device and another friction device. The energy storage element can be axially positioned between the friction device and another friction device. The energy storage element can at least partially overlap with the friction device and / or another friction device in the axial direction. Alternatively, the energy storage element can be arranged without overlapping with the friction device and / or another friction device in the axial direction.

[0026] In one particular embodiment of the invention, the friction device is preferably disposed radially inside the damping device. Another friction device may be disposed radially inside the damping device.

[0027] The accompanying drawings illustrate other advantages and preferred designs of the invention. Attached Figure Description

[0028] The present invention will now be described in detail with reference to the accompanying drawings. The specific drawings are as follows:

[0029] Figure 1 This is a partial cross-sectional view of a gear assembly in a particular embodiment of the present invention;

[0030] Figure 2 for Figure 1 A spatial sectional view of the gear assembly shown;

[0031] Figure 3 This is a partial cross-sectional view of the gear assembly in another particular embodiment of the present invention;

[0032] Figure 4 This is a partial cross-sectional view of the gear assembly in another particular embodiment of the present invention. Detailed Implementation

[0033] Figure 1 A cross-sectional view of a gear assembly according to a preferred embodiment of the invention is shown. The gear assembly 10 includes an outer ring 14 rotatable about a rotation axis 12, having external teeth 16. The outer ring 14 is designed, for example, as a gear ring, and the external teeth 16 are particularly helical teeth. Furthermore, the gear assembly 10 includes a damping device 18 providing elastic force, which has at least one energy storage element 20. Here, the energy storage element 20 is a helical spring.

[0034] Furthermore, the gear assembly 10 also includes an inner ring 22 located radially inside the outer ring 14 and arranged concentrically with the outer ring 14. This inner ring 22 is capable of limited rotation relative to the outer ring 14 against spring force and has internal teeth 24. The inner ring 22 is designed, for example, as an output hub, and the internal teeth 24 are, in particular, spur teeth. A fluid guiding device 26 with an oil groove 28 is provided within the region of the internal teeth 24. The oil groove 28 is, for example, continuous in the circumferential direction, and the fluid guiding device 26 includes a through-hole connecting the oil groove 28, located between the internal teeth 24 and the outer peripheral surface 29 of the inner ring 22. This allows lubricant, particularly oil, to be supplied to the damping device 18.

[0035] One end of the energy storage element 20 abuts against the working surface of the inner ring 22, and the other end abuts against the working surface of the outer ring 14, which is offset circumferentially. When torque is transmitted between the internal teeth 24 and the external teeth 16, the damping device 18 functions between the inner ring 22 and the outer ring 14. Depending on the direction of torque transmission, the outer ring 14 can constitute either the damping input or the damping output of the damping device 18, while the inner ring 22 can constitute either the damping output or the damping input of the damping device 18. The energy storage element 20 transmits the torque to be transmitted between the damping input and the damping output.

[0036] Furthermore, the gear assembly 10 has a first side element 30 fixedly connected to the outer ring 14 on the first axial side, and a second side element 32 fixedly connected to the outer ring 14 on the second axial side opposite to the first axial side. A damping device 18 with an energy storage element 20 is arranged axially between the first side element 30 and the second side element 32.

[0037] A friction device 34, capable of exerting friction and achieving a frictional connection, is provided between the first side element 30 and the inner ring 22. Another friction device 36, also capable of exerting friction and achieving a frictional connection, is provided between the second side element 32 and the inner ring 22. The friction device 34 and the other friction device 36 are located radially inside the damping device 18 and are arranged axially without overlapping with the energy storage element 20. The friction device 34 includes an axial spring element 38 and a friction ring 40 abutting against the first side element 30. The friction ring 40 and the axial spring element 38 are preferably mounted on the inner ring 22 in a torsional manner. The axial spring element 38 is, for example, a disc spring 42. One end of the axial spring element 38 abuts against the radial flange 44 of the inner ring 22, and the other end abuts against the friction ring 40. The friction ring 40 frictionally abuts against the first side element 30 in the first abutment region 46, and the friction ring 40 also has a centering flange 48 for centering the axial spring element 38. The axial spring element 38 applies an axial spring force to the friction ring 40. The friction ring 40 is able to overcome the axial spring force and make limited axial movement relative to the inner ring 22 in the first axial direction 49.

[0038] The other friction device 36 comprises only another friction ring 50, which frictionally abuts against the second side element 32 in the second abutment region 52 and frictionally abuts against the radial flange 44 of the inner ring 22 in the third abutment region 54. The second abutment region 52 and the third abutment region 54 are located on the same diameter and are closer to the radial outer side than the first abutment region 46.

[0039] The axial movement of the friction element 40 in the first axial direction 49 can be limited by the movable clearance of the axial spring element 38. The axial movement in the second axial direction 58, opposite to the first axial direction 49, can be limited by another friction ring 50 located between the second side element 32 and the inner ring 22.

[0040] When torque is transmitted between the outer teeth 16 and the inner teeth 24 in the first rotational direction, especially in traction operation, as the torque increases, the helical teeth of the outer ring 14 apply an increased axial force to the other friction ring 50 through the second side element 32. When torque is transmitted between the outer teeth 16 and the inner teeth 24 in a second rotational direction opposite to the first rotational direction, especially in traction operation, the friction force of the friction device 34 mainly plays a role.

[0041] Figure 2 It shows Figure 1 The diagram shows a spatial sectional view of the gear assembly. The first side element 30 and the second side element 32 are interconnected by a plurality of fixing elements 60 arranged at intervals in the circumferential direction and are fixedly connected to the outer ring 14. The fixing elements 60 may be designed as rivets or bolts.

[0042] The fluid guiding device 26 includes a circumferentially continuous oil groove 28 and a through hole 62 connecting the oil groove 28 between the inner teeth 24 and the outer peripheral surface 29 of the inner ring 22. In this way, the incoming lubricant (especially oil) can be delivered through the oil groove 28 to the through hole 62, and then to the damping device.

[0043] Figure 3 A partial cross-sectional view of a gear assembly according to another embodiment of the present invention is shown. The structure of this gear assembly 10 is similar to... Figure 1 The structures shown are basically the same, with only the following differences. The friction ring 40 can overcome the axial spring force of the axial spring element 38 and make limited axial movement relative to the inner ring 22 in the first axial direction 49, and its maximum movement in the first axial direction 49 is limited by the stop device 64. The stop device 64 functions between the centering flange 48, which acts as an axial flange on the friction ring 40, and the inner ring 22. This protects the axial spring element 38 from excessive load.

[0044] Figure 4A partial cross-sectional view of a gear assembly according to another embodiment of the present invention is shown. The structure of this gear assembly 10 is similar to... Figure 1 The structures shown are basically the same, with only the following differences. Another friction device 36 has another axial spring element 66 that applies axial force to another friction ring 50. This other axial spring element 66 is another disc spring 68. One end of this other axial spring element 66 abuts against the radial flange 44 of the inner ring 22, and the other end frictionally abuts against the other friction ring 50. Specifically, the friction device 34 and the other friction device 36 are mirror-symmetrical with respect to the energy storage element 20.

[0045] List of reference numerals

[0046] 10 Gear Assembly

[0047] 12 Rotational shafts

[0048] 14 Outer Ring

[0049] 16 External teeth

[0050] 18 Damping devices

[0051] 20 Energy Storage Components

[0052] 22 Inner Ring

[0053] 24 internal teeth

[0054] 26 Fluid guiding device

[0055] 28 Oil tank

[0056] 29. Outer circumference

[0057] 30 First side element

[0058] 32 Second side element

[0059] 34 Friction Device

[0060] 36 Another friction device

[0061] 38 Axial Spring Elements

[0062] 40 Friction Ring

[0063] 42 Disc Spring

[0064] 44 Radial flange

[0065] 46 First arrival area

[0066] 48 Centering flange

[0067] 49 First axial direction

[0068] 50 Another friction ring

[0069] 52 Second arrival area

[0070] 54 Third arrival area

[0071] 58 Second axial direction

[0072] 60 Fixed components

[0073] 62 through holes

[0074] 64. Stopping device

[0075] 66 Another axial spring element

[0076] 68 Another disc spring

Claims

1. A gear assembly (10) for transmitting torque between external teeth (16) and internal teeth (24), the gear assembly (10) comprising: An outer ring (14) having the external teeth (16) that can rotate about a rotation axis (12), A damping device (18) provides elasticity. An inner ring (22) having the internal teeth (24) is located radially inside the outer ring (14) and is arranged concentrically with the outer ring (14). The inner ring (22) can rotate a limited distance relative to the outer ring (14) against elastic forces. Its features are, The gear assembly (10) also has at least one first side element (30) fixedly connected to the outer ring (14) and a friction device (34) that can perform frictional engagement between the first side element (30) and the inner ring (22). The friction device (34) includes at least one friction ring (40) and at least one axial spring element (38) that applies an axial spring force to the friction ring (40).

2. The gear assembly (10) according to claim 1, characterized in that, The friction ring (40) can overcome the axial spring force and move axially relative to the inner ring (22) in a limited manner.

3. The gear assembly (10) according to claim 1 or 2, characterized in that, The friction ring (40) is frictionally engaged with the first side element (30).

4. The gear assembly (10) according to any one of the preceding claims, characterized in that, One end of the axial spring element (38) is supported on the inner ring (22), and the other end is supported on the friction ring (40).

5. The gear assembly (10) according to any one of the preceding claims, characterized in that, The gear assembly (10) also has at least one second side element (32) fixedly connected to the outer ring (14), the second side element (32) being disposed on the axial opposite side of the first side element (30) relative to the damping device (18), and another friction device (36) capable of frictional engagement being disposed between the second side element (32) and the inner ring (22), the other friction device (36) including at least one other friction ring (50).

6. The gear assembly (10) according to claim 5, characterized in that, The other friction ring (50) is frictionally engaged with the second side element (32).

7. The gear assembly (10) according to claim 5 or 6, characterized in that, The other friction ring (50) is frictionally engaged with the inner ring (22).

8. The gear assembly (10) according to any one of claims 5 to 7, characterized in that, The other friction device (36) has at least one other axial spring element (66) that applies an axial force to the other friction ring (50).

9. The gear assembly (10) according to any one of claims 5 to 8, characterized in that, The damping device (18) is axially positioned between the friction device (34) and the other friction device (36).

10. The gear assembly (10) according to any one of the preceding claims, characterized in that, The friction device (34) is located radially inside the damping device (18).

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