Torque transmission device

Abstract

The invention relates to a torque transmission device (10) of a powertrain for transmitting a driving torque to an output element, the device comprising: an electric motor (14), the electric motor having a conversion unit (20), the conversion unit comprising a stator (22) and a rotor (26) rotatable relative to the stator and for converting electrical energy into mechanical energy; and a torsional vibration damper (70, 76), the torsional vibration damper having a damper mass (74, 80), the damper mass being received on a damper mass support (72, 78) so that the damper mass can be deflected to a limited extent to resist the effect of a restoring force, the damper mass (74, 80) being arranged to radially overlap the conversion unit (20).

Description

Technical Field

[0001] The invention relates to a torque transmission device according to the preamble of claim 1 . Background Art

[0002] A torque transmission device is known, for example, from DE 10 2014 222 644 A1. A torque transmission device for a powertrain of a motor vehicle is described therein. The torque transmission device comprises an input side for connection to an internal combustion engine as a drive element, an output side for connection to an output element, an electric motor with a stator and a rotor, and a torsional vibration damper located between the rotor and the output side. The torsional vibration damper comprises a centrifugal pendulum arranged radially inside the rotor. Summary of the invention

[0003] The object of the invention is to improve a torque transmission device. The invention aims to reduce torsional vibrations to a greater extent and also to save axial installation space.

[0004] At least one of these objects is achieved by a torque transmission device having the features of claim 1. As a result, the torsional vibration damper can be operated more efficiently and at the same time axial installation space can be saved.

[0005] The powertrain can be arranged in a vehicle. The powertrain can be a hybrid powertrain. The conversion unit can provide a drive torque. The drive torque can be provided by a drive element, in particular an internal combustion engine. A disconnect clutch can be effectively arranged between the drive element and the electric motor. The disconnect clutch can be designed as a K0 clutch. The electric motor can be operated in a P2 hybrid configuration.

[0006] The output element may be a transmission, preferably an automatic transmission, a manual transmission, a CVT transmission or a dual clutch transmission.

[0007] The rotor may be arranged radially inside the stator or radially outside the stator. The rotor is generally arranged to overlap axially with the stator. The rotor is connected to a rotor carrier for transmitting a driving torque provided by the conversion unit.

[0008] A torsional vibration damper may be effectively arranged between the disconnect clutch and the output element. The torsional vibration damper may be a fixed frequency damper or a speed adaptive damper. A torsional vibration damper may be effectively arranged between the electric motor and the output element. Another torsional vibration damper may be effectively arranged between the disconnect clutch and the output element. The torsional vibration damper may be arranged in a fluid chamber, which may be at least partially filled with a fluid.

[0009] A torque transmission unit may be arranged operatively between the disconnect clutch and the output element. The torque transmission unit may have a housing defining a fluid chamber. The torsional vibration damper may be arranged inside the housing.

[0010] In a preferred embodiment of the invention, the damper mass is arranged axially at a distance from the conversion unit.The torsional vibration damper can be arranged axially between the electric motor and the output element or on the opposite side.

[0011] In a specific embodiment of the present invention, the radial inner circumference of the damper mass is radially arranged inside the radial inner circumference of the conversion unit or radially arranged outside the radial inner circumference of the conversion unit. The radial inner circumference of the damper mass can be radially arranged inside the radial inner circumference of the rotor and / or stator or radially arranged outside the radial inner circumference of the rotor and / or stator.

[0012] In another specific embodiment of the present invention, the radial outer circumference of the damper mass is radially arranged inside the radial outer circumference of the conversion unit or radially arranged outside the radial outer circumference of the conversion unit. The radial outer circumference of the damper mass can be radially arranged inside the radial outer circumference of the rotor and / or stator or radially arranged outside the radial outer circumference of the rotor and / or stator.

[0013] In a preferred embodiment of the invention, the radially outer circumference of the damper mass is arranged radially outside the radially inner circumference of the conversion unit. The radially outer circumference of the damper mass may be arranged radially outside the radially inner circumference of the rotor and / or stator.

[0014] In a specific embodiment of the present invention, the center of gravity of the damper mass is arranged radially outside the radial inner circumference of the conversion unit. The center of gravity of the damper mass may be arranged radially outside the radial inner circumference of the rotor and / or stator.

[0015] In a specific embodiment of the invention, the center of gravity of the damper mass is arranged radially inside the radial outer circumference of the conversion unit. The center of gravity of the damper mass may be arranged radially inside the radial outer circumference of the rotor and / or stator.

[0016] In another specific embodiment of the invention, the torsional vibration damper is a centrifugal pendulum and the damper mass is a pendulum mass which is attached to a damper mass support designed as a pendulum mass support and can be deflected to a limited extent along the pendulum path.

[0017] The internal combustion engine can generate torsional vibrations. The torsional vibrations can have at least one main excitation sequence, wherein the centrifugal pendulum is designed according to the excitation sequence in order to reduce the torsional vibrations as much as possible. A further centrifugal pendulum can be arranged particularly effectively between the separation clutch and the output element. The further centrifugal pendulum can be designed according to the same or different excitation sequence as the first centrifugal pendulum. The further centrifugal pendulum can have at least one pendulum mass, which is arranged so that it radially overlaps towards the conversion unit or radially overlaps on the inside of the conversion unit.

[0018] The centrifugal pendulum may have at least two circumferential pendulum masses. The pendulum masses may be connected to each other via a coupling device. The coupling device may have a force coupling for force transmission between the pendulum masses and / or a motion coupling for synchronizing the motion of the pendulum masses.

[0019] The pendulum mass may be arranged to overlap axially with the pendulum mass support. The pendulum mass may be arranged in a pendulum mass recess in the pendulum mass support. The pendulum mass may be arranged substantially axially within the pendulum mass support. The pendulum mass may be formed by a first pendulum mass component and a second pendulum mass component connected to the first pendulum mass component. The first pendulum mass component may be arranged on a first axial side of the pendulum mass support, and the second pendulum mass component may be arranged on an opposite second axial side of the pendulum mass support.

[0020] The pendulum mass part can be supported on the pendulum mass part support part via at least one bearing element. The bearing element can roll on the radial outer circumference of the pendulum mass part. The bearing element can roll on the radial outer inner circumference of the pendulum mass part recess.

[0021] In a particular embodiment of the invention, the torsional vibration damper is arranged within a torque converter, the torque converter being operatively arranged between the electric motor and the output member.The torsional vibration damper may be at least partially operable in a fluid when in wet-running operation.

[0022] In a preferred embodiment of the invention, the converter lockup clutch and / or the torsional vibration damper are arranged in the torque converter and radially inside the conversion unit. Thus, the installation space in the conversion unit can be used.

[0023] Further advantages and advantageous embodiments of the invention emerge from the description of the drawings and the figures. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is described in detail below with reference to the accompanying drawings. Specifically:

[0025] Figure 1 : shows a half section through a torque transmitting device in a specific embodiment of the present invention.

[0026] Figure 2 : shows a side view of a torque transmission device in another specific embodiment of the present invention. DETAILED DESCRIPTION

[0027] Figure 1 A half section through a torque transmission device 10 in a specific embodiment of the invention is shown. The torque transmission device 10 is installed in a drive train of a vehicle. The drive train is a hybrid drive train, in which a drive element provides a drive torque via a drive shaft 12. The drive element is designed as an internal combustion engine, for example. In addition, an electric motor 14 provides a further drive torque for transmission to an output element, which has a transmission input shaft 16 on the input side. The output element is preferably a transmission.

[0028] A disconnect clutch 18 is effectively arranged between the drive element and the electric motor 14. The disconnect clutch 18 is a K0 clutch and the electric motor 14 is connected in a P2 hybrid configuration. The electric motor 14 comprises a conversion unit 20 which is arranged to convert electrical energy into mechanical energy and comprises a stator 22 and a rotor 26 which can rotate relative to the stator 22 about an axis of rotation 24. The rotor 26 is screwed to an input shaft 30 via a rotor carrier 28. The stator 22 is received on a stator carrier 32 which is connected to a stationary housing.

[0029] The disconnect clutch 18 is connected downstream of a torque transfer unit 34, which is designed here as a torque converter 36. The clutch output 38 of the disconnect clutch 18 is connected to the input shaft 30 in a rotationally fixed manner. The input shaft 30 is fixed to a housing 40 of the torque transfer unit 34 in a fixed manner. The housing 40 is designed as a converter housing 42 and defines a fluid chamber 44 for receiving a converter fluid. The torque transfer unit 34 is mounted via the input shaft 30 on a partition wall 45. The partition wall 45 is arranged on the stationary housing. The partition wall 45 is arranged axially between the disconnect clutch 18 and the torque transfer unit 34 and radially overlaps the disconnect clutch and the torque transfer unit.

[0030] The pump impeller 46 is connected to the converter housing 42 in a fixed manner and transmits torque to a turbine 48, which is connected to the transmission input shaft 16. A converter lockup clutch 50 is connected in parallel with the pump impeller 46 and the turbine 48. When the converter lockup clutch 50 is open, the torque is transmitted to the output element via the pump impeller 46 and the turbine 48. When the converter lockup clutch 50 is closed, the drive torque is directed to the torsional vibration damper 52 connected downstream via the converter lockup clutch 50 and from the torsional vibration damper to the output element.

[0031] The torsional vibration damper 52 and the converter lock-up clutch 50 are arranged radially inside the conversion unit 20. The converter lock-up clutch 50 partially overlaps the conversion unit 20 axially, and the torsional vibration damper 52 is arranged axially offset relative to the conversion unit 20.

[0032] The damper input part 54 of the torsional vibration damper 52 is connected in a fixed manner to the clutch output 56 of the converter lock-up clutch 50. The damper output part 58 can be rotated to a limited extent relative to the damper input part 54 via the action of a spring element 60, which is designed as a helical spring, in particular, as a compression spring. The damper output part 58 is designed in two parts here and comprises a first damper disk part 62 and a second damper disk part 64, which is connected in a fixed manner to the first damper disk part and is arranged axially at a certain distance from the first damper disk part, which second damper disk part is in turn connected in a fixed manner to the output hub 66 and the turbine 48 via a rivet connection 68.

[0033] A torsional vibration damper 70 is arranged on the damper output part 58, which is arranged here on the second damper disk part 64. The torsional vibration damper 70 includes a damper mass support 72 and at least one damper mass 74 received on the damper mass support, so that the torsional vibration damper can deflect to resist the effect of the restoring force. The torsional vibration damper 70 is designed as a centrifugal pendulum 76, and the damper mass support 72 forms a pendulum mass support 78, and the damper mass 74 forms a pendulum mass 80. The pendulum mass 80 can deflect to a limited extent along the pendulum path relative to the pendulum mass support 78 to resist the influence of centrifugal forces. The pendulum mass 80 is supported on the pendulum mass support 78 via at least one bearing element 82.

[0034] The pendulum mass support 78 can be designed as one piece with the damper output component 58, in particular with the second damper disk component 64, or as a separate component. At least two pendulum masses 80 arranged at a certain distance in the circumferential direction can be arranged on the pendulum mass support 78. The pendulum mass 80 is arranged radially outside the converter lockup clutch 50 and the spring element 60, and is arranged to overlap radially with the conversion unit 20. The pendulum mass 80 is attached to the conversion unit 20 in an axially offset manner. The radial inner circumference of the pendulum mass 80 is radially outward more than the radial inner circumference of the rotor 26, and the radial outer circumference of the pendulum mass 80 is radially arranged outside the radial outer circumference of the stator 22. Therefore, the mass moment of inertia of the pendulum mass 80 can be increased and the axial installation space required for the centrifugal pendulum 76 can be reduced.

[0035] Figure 2A side view of a torque transmission device 10 in another embodiment of the invention is shown. The conversion unit 20 of the electric motor 14 is shown in phantom. The conversion unit 20 thus comprises a rotor 26 rotatable about an axis of rotation 24 and a stator 22 that is fixed.

[0036] The torsional vibration damper 70 is designed as a centrifugal pendulum 76. The damper mass 74 is designed as a pendulum mass 80, and the damper mass support 72 is designed as a pendulum mass support 78 that can rotate about the rotation axis 24. A total of four pendulum masses 80 are arranged in the circumferential direction. The individual pendulum masses 80 are supported on the pendulum mass support 78 via two bearing elements 82, which are designed as pendulum rollers.

[0037] The radially inner circumference 84 of the pendulum mass 80 is arranged radially outside the radially inner circumference 86 of the conversion unit 20, in particular here radially outside the radially inner circumference of the rotor 26. The radially outer circumference 88 of the pendulum mass 80 is arranged radially outside the radially outer circumference 90 of the conversion unit 20, in particular here radially outside the radially outer circumference of the stator 22. The radially outer circumference 88 of the pendulum mass 80 is arranged radially outside the radially inner circumference 86 of the conversion unit 20, in particular here radially outside the radially inner circumference of the rotor 26, and also radially outside the radially inner circumference of the stator 22. The center of gravity 92 of the pendulum mass 80 is arranged radially outside the radially inner circumference 86 of the conversion unit 20 and radially inside the radially outer circumference 90 of the conversion unit 20.

[0038] Description of Reference Numerals

[0039] 10 Torque transmission device 12 Drive shaft 14 Electric motor 16 Transmission input shaft 18 Decoupling clutch 20 Converter unit 22 Stator 24 Rotation axis 26 Rotor 28 Rotor carrier 30 Input shaft 32 Stator carrier 34 Torque transmission unit 36 ​​Torque converter 38 Clutch output 40 Housing 42 Converter housing 44 Fluid chamber 45 Partition wall 46 Pump wheel 48 Turbine wheel 50 Converter lock-up clutch 52 Torsional vibration damper 54 Damper input component 56 Clutch output 58 Damper output component 60 Spring element 62 Damper disk component 64 Damper disk component 66 Output hub 68 Riveted connection 70 Torsional vibration damper 72 Damper mass support 74 Damper mass 76 Centrifugal pendulum 78 Pendulum mass support 80 Pendulum mass 82 Bearing element 84 Inner circumference 86 Inner circumference 88 Outer circumference 90 Outer circumference 92 Center of gravity

Claims

1. A torque transmission device (10) of a powertrain for transmitting a driving torque to an output element, the torque transmission device comprising: an electric motor (14), the electric motor having a conversion unit (20), the conversion unit comprising a stator (22) and a rotor (26) rotatable relative to the stator and used for converting electrical energy into mechanical energy; and a torsional vibration damper (70, 76), the torsional vibration damper having a damper mass (74, 80), the damper mass being received on a damper mass support (72, 78) so that the damper mass can be deflected to a limited extent to resist the effect of a restoring force, characterized in that The damper mass (74, 80) is arranged to radially overlap with the conversion unit (20), and the torsional vibration damper (70, 76) is arranged in a converter housing (40) of a torque converter (36), and the converter housing (40) is used to define a fluid chamber (44) for the fluid of the torque converter (36), and the torque converter (36) is effectively arranged between the electric motor (14) and the output element.

2. The torque transmission device (10) according to claim 1, characterized in that The damper mass (74, 80) is arranged axially at a distance from the conversion unit (20).

3. The torque transmission device (10) according to claim 1, characterized in that The radial inner circumference (84) of the damper mass (74, 80) is arranged radially inside or outside the radial inner circumference (86) of the conversion unit (20).

4. The torque transmission device (10) according to claim 1, characterized in that The radially outer circumference (88) of the damper mass (74, 80) is arranged radially inside or outside the radially outer circumference (90) of the conversion unit (20).

5. The torque transmission device (10) according to claim 1, characterized in that The radially outer circumference (88) of the damper mass (74, 80) is arranged radially outside the radially inner circumference (86) of the conversion unit (20).

6. The torque transmission device (10) according to claim 1, characterized in that The center of gravity (92) of the damper mass (74, 80) is arranged radially outside the radial inner circumference (86) of the conversion unit (20).

7. The torque transmission device (10) according to claim 1, characterized in that The center of gravity (92) of the damper mass (74, 80) is arranged radially inside the radial outer circumference (90) of the conversion unit (20).

8. The torque transmission device (10) according to any one of claims 1 to 7, characterized in that The torsional vibration damper (70) is a centrifugal pendulum (76), and the damper mass (74) is a pendulum mass (80), which is attached to the damper mass support (72) designed as a pendulum mass support (78) and can be deflected to a limited extent along a pendulum path.

9. The torque transmission device (10) according to claim 1, characterized in that A converter lockup clutch (50) and / or a second torsional vibration damper (52) are arranged inside the torque converter (36) and radially inside the conversion unit (20).

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