TORQUE TRANSMISSION DEVICE

Description

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

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

[0003] The prior art is referred to as DE 10 2016 211 945 A1, DE 10 2012 203 611 A1, DE 10 2016 211 943 A1 and EP 2 600 031 A2.

[0004] The object of the present invention is to improve a torque transmission device. The torsional vibrations are to be reduced significantly and axial installation space is to be saved.

[0005] At least one of these tasks is solved by a torque transmission device with the features according to claim 1. This allows the torsional vibration damper to be operated more efficiently and at the same time saves axial installation space.

[0006] The powertrain can be located within a vehicle. The powertrain can be a hybrid powertrain. The conversion unit can provide the 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 arrangement.

[0007] The output element can be a transmission, preferably an automatic transmission, a manual transmission, a CVT transmission or a dual-clutch transmission.

[0008] The rotor can be arranged radially inside or radially outside the stator. The rotor is primarily arranged axially overlapping the stator. The rotor is connected to a rotor carrier to transmit the drive torque provided by the conversion unit.

[0009] The torsional vibration damper can be effectively arranged between the disconnect clutch and the output element. The torsional vibration damper can be a fixed-frequency damper or a speed-adaptive damper. The torsional vibration damper can be effectively arranged between the electric motor and the output element. Another torsional vibration damper can be effectively arranged between the disconnect clutch and the output element. The torsional vibration damper can be arranged in a fluid chamber that can be at least partially filled with a fluid.

[0010] A torque transmission unit can be effectively arranged between the disconnect coupling and the output element. The torque transmission unit can have a housing that defines a fluid space. The torsional vibration damper can be located inside the housing.

[0011] In a preferred embodiment of the invention, the damper mass is arranged axially spaced 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.

[0012] In a particular embodiment of the invention, a radial inner circumference of the damping mass is arranged radially inside or radially outside a radial inner circumference of the conversion unit. A radial inner circumference of the damping mass can be arranged radially inside or radially outside a radial inner circumference of the rotor and / or the stator.

[0013] In a further specific embodiment of the invention, a radially outer circumference of the damping mass is arranged radially inside or radially outside a radially outer circumference of the conversion unit. A radially outer circumference of the damping mass can be arranged radially inside or radially outside a radially outer circumference of the rotor and / or the stator.

[0014] In a preferred embodiment of the invention, a radially outer circumference of the damping mass is arranged radially outside a radially inner circumference of the conversion unit. A radially outer circumference of the damping mass can be arranged radially outside a radially inner circumference of the rotor and / or the stator.

[0015] In a particular embodiment of the invention, the center of mass of the damper mass is arranged radially outside a radially inner circumference of the conversion unit. The center of mass of the damper mass can also be arranged radially outside a radially inner circumference of the rotor and / or stator.

[0016] In a particular embodiment of the invention, the center of mass of the damper mass is arranged radially within a radially outer circumference of the conversion unit. The center of mass of the damper mass can also be arranged radially within a radially outer circumference of the rotor and / or stator.

[0017] In another special embodiment of the invention, the torsional vibration damper is a centrifugal pendulum and the damper mass is a pendulum mass which is mounted on the damper mass carrier designed as a pendulum mass carrier along a pendulum path in a limited deflection manner.

[0018] The internal combustion engine can generate torsional vibrations. These vibrations can have at least one principal excitation order, with the centrifugal pendulum being designed for this excitation order in order to minimize the torsional vibrations. A further centrifugal pendulum can be arranged, particularly effectively between the disconnect clutch and the output element. This further centrifugal pendulum can be designed for the same or a different excitation order as the first centrifugal pendulum. The further centrifugal pendulum can have at least one pendulum mass arranged radially overlapping with or radially within the conversion unit.

[0019] The centrifugal pendulum can have at least two pendulum masses on its circumference. The pendulum masses can be coupled to each other by coupling means. The coupling means can provide force coupling for force transmission between the pendulum masses and / or motion coupling for synchronizing the movements of the pendulum masses.

[0020] The pendulum mass can be arranged axially overlapping the pendulum mass support. The pendulum mass can be arranged within a pendulum mass cutout in the pendulum mass support. The pendulum mass can be arranged axially primarily within the pendulum mass support. The pendulum mass can consist of a first pendulum mass component and a second pendulum mass component connected to it. The first pendulum mass component can be arranged on a first axial side of the pendulum mass support, and the second pendulum mass component can be arranged on an opposite second axial side of the pendulum mass support.

[0021] The pendulum mass can be supported on the pendulum mass carrier by at least one bearing element. The bearing element can be able to roll on a radially outer circumference of the pendulum mass. The bearing element can be able to roll on a radially outer inner circumference of the pendulum mass cutout.

[0022] In one embodiment according to the invention, the torsional vibration damper is arranged within a torque converter effectively positioned between the electric motor and the output element. The torsional vibration damper can be operated in a wet state, at least partially immersed in a fluid.

[0023] In a preferred embodiment of the invention, a torque converter lock-up clutch and / or a torsional vibration damper is arranged inside the torque converter and radially inside the conversion unit. This allows the installation space within the conversion unit to be utilized.

[0024] Further advantages and advantageous embodiments of the invention will become apparent from the description of the figures and the illustrations. Character description

[0025] The invention is described in detail below with reference to the illustrations. These show, in detail: Figure 1: A half-section through a torque transmission device in a specific embodiment of the invention. Figure 2: A side view of a torque transmission device in another specific embodiment of the invention.

[0026] Figure 1Figure 1 shows a half-section through a torque transmission device 10 in a specific embodiment of the invention. The torque transmission device 10 is installed in the drivetrain of a vehicle. The drivetrain is a hybrid drivetrain in which a drive element provides drive torque via a drive shaft 12. The drive element is, for example, an internal combustion engine. Furthermore, an electric motor 14 generates a further drive torque for transmission to an output element, which has a transmission input shaft 16 on its input side. The output element is preferably a transmission.

[0027] A disconnect coupling 18 is effectively arranged between the drive element and the electric motor 14. The disconnect coupling 18 is a K0 coupling, and the electric motor 14 is connected in a P2 hybrid arrangement. The electric motor 14 comprises a conversion unit 20 designed for converting electrical energy into mechanical energy, which has a stator 22 and a rotor 26 rotatable about an axis of rotation 24 relative to the stator. The rotor 26 is bolted to an input shaft 30 via a rotor carrier 28. The stator 22 is mounted on a stator support 32, which is connected to a fixed housing.

[0028] A torque transmission unit 34, configured here as a torque converter 36, is connected downstream of the disconnecting clutch 18. A clutch output 38 of the disconnecting clutch 18 is rotationally fixed to the input shaft 30. The input shaft 30 is rigidly connected to a housing 40 of the torque transmission unit 34. The housing 40 is designed as a converter housing 42 and defines a fluid chamber 44 for receiving a converter fluid. The torque transmission unit 34 is mounted on a partition 45 via the input shaft 30. The partition 45 is arranged on a fixed housing. The partition 45 is arranged axially between and radially overlapping the disconnecting clutch 18 and the torque transmission unit 34.

[0029] A pump impeller 46 is rigidly connected to the converter housing 42 and transmits torque to a turbine impeller 48, which is connected to the transmission input shaft 16. A converter lock-up clutch 50 is connected in parallel to the pump impeller 46 and the turbine impeller 48. When the converter lock-up clutch 50 is open, torque is transmitted via the pump impeller 46 and the turbine impeller 48 to the output element. When the converter lock-up clutch 50 is closed, the drive torque is directed via the converter lock-up clutch 50 to a downstream torsional vibration damper 52 and from there to the output element.

[0030] The torsional vibration damper 52 and the torque converter lock-up clutch 50 are arranged radially inside the conversion unit 20. The torque converter lock-up clutch 50 partially overlaps the conversion unit 20 axially, and the torsional vibration damper 52 is arranged axially offset from the conversion unit 20.

[0031] A damper input part 54 of the torsional vibration damper 52 is rigidly connected to a clutch output 56 of the torque converter lock-up clutch 50. A damper output part 58 is rotatable relative to the damper input part 54 to a limited extent by means of spring elements 60, which are designed as coil springs, in particular as compression springs. The damper output part 58 is designed here in two parts and comprises a first damper disc part 62 and a second damper disc part 64, which is rigidly connected to it and arranged axially spaced apart. The second damper disc part 64 is in turn rigidly connected to an output hub 66 and the turbine wheel 48 via a rivet connection 68.

[0032] A torsional vibration damper 70 is arranged at the damper outlet part 58, here at the second damper disc part 64. The torsional vibration damper 70 comprises a damper mass carrier 72 and at least one damper mass 74 mounted thereon so as to be deflected against the action of a restoring force. The torsional vibration damper 70 is designed here as a centrifugal pendulum 76, and the damper mass carrier 72 forms a pendulum mass carrier 78, and the damper mass 74 a pendulum mass 80. The pendulum mass 80 is deflected relative to the pendulum mass carrier 78 against the action of the centrifugal force along a pendulum path, subject to limited deflection. The pendulum mass 80 is mounted on the pendulum mass carrier 78 via at least one bearing element 82.

[0033] The pendulum mass carrier 78 can be formed integrally with the damper output part 58, in particular with the second damper disc part 64, or as a separate component. At least two circumferentially spaced pendulum masses 80 can be arranged on the pendulum mass carrier 78. The pendulum masses 80 are arranged radially outside the converter lock-up clutch 50 and the spring elements 60 and radially overlapping the conversion unit 20. The pendulum mass 80 is axially offset from the conversion unit 20. A radially inner circumference of the pendulum mass 80 is radially further outward than a radially inner circumference of the rotor 26, and a radially outer circumference of the pendulum mass 80 is radially outside a radially outer circumference of the stator 22. This allows the moment of inertia of the pendulum mass 80 to be increased and the axially required installation space for the centrifugal pendulum 76 to be reduced.

[0034] In Figure 2Figure 1 shows a side view of a torque transmission device 10 in a further specific embodiment of the invention. The conversion unit 20 of the electric motor 14 is shown with a dashed line. The conversion unit 20 comprises the rotor 26, which is rotatable about the axis of rotation 24, and the fixed stator 22.

[0035] 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 rotatable about the axis of rotation 24. A total of four pendulum masses 80 are arranged circumferentially. Each individual pendulum mass 80 is mounted on the pendulum mass support 78 via two bearing elements 82, which are designed here as pendulum rollers.

[0036] A radial inner circumference 84 of the pendulum mass 80 is arranged radially outside a radial inner circumference 86 of the conversion unit 20, in particular outside a radial inner circumference of the rotor 26. A radial outer circumference 88 of the pendulum mass 80 is arranged radially outside a radial outer circumference 90 of the conversion unit 20, in particular outside a radial outer circumference of the stator 22. The radial outer circumference 88 of the pendulum mass 80 is arranged radially outside the radial inner circumference 86 of the conversion unit 20, in particular outside a radial inner circumference of the rotor 26 and also outside a radial inner circumference of the stator 22. A center of mass 92 of the pendulum mass 80 is arranged radially outside the radial inner circumference 86 of the conversion unit 20 and radially inside the radial outer circumference 90 of the conversion unit 20. Reference symbol list

[0037] 10 Torque transmission device 12 Drive shaft 14 Electric motor 16 Gearbox input shaft 18 Disconnect clutch 20 Conversion unit 22 Stator 24 Shaft of rotation 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 46 Pump impeller 48 Turbine impeller 50 Converter lock-up clutch 52 Torsional vibration damper 54 Damper input part 56 Clutch output 58 Damper output part 60 Spring element 62 Damper disc part 64 Damper disc part 66 Output hub 68 Riveted connection 70 Torsional vibration damper 72 Damper mass carrier 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 mass

Claims

1. A torque transmitting device (10) for a drive train for transmitting a driving torque to an output element, having an electric motor (14) with a conversion unit (20) having a stator (22) and a rotor (26) rotatable relative to the latter for converting electrical energy into mechanical energy, and a torsional vibration damper (70, 76) with a damper mass (74, 80) accommodated on a damper mass carrier (72, 78) in a manner deflectable to a limited extent against the effect of a restoring force, wherein the damper mass (74, 80) is arranged in a radially overlapping manner with respect to the conversion unit (20), characterized in that the torsional vibration damper (70, 76) is arranged inside of a torque converter (36) effectively arranged between the electric motor (14) and the output element.

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

3. The torque transmitting device (10) according to claim 1 or 2, characterized in that a radially inner circumference (84) of the damper mass (74, 80) is arranged radially inside or radially outside of a radially inner circumference (86) of the conversion unit (20).

4. The torque transmitting device (10) according to any one of the preceding claims, characterized in that a radially outer circumference (88) of the damper mass (74, 80) is arranged radially inside or radially outside of a radially outer circumference (90) of the conversion unit (20).

5. The torque transmitting device (10) according to any one of the preceding claims, characterized in that a radially outer circumference (88) of the damper mass (74, 80) is arranged radially outside of a radially inner circumference (86) of the conversion unit (20).

6. The torque transmitting device (10) according to any one of the preceding claims, characterized in that a centre of mass (92) of the damper mass (74, 80) is arranged radially outside of a radially inner circumference (86) of the conversion unit (20).

7. The torque transmitting device (10) according to any one of the preceding claims, characterized in that a centre of mass (92) of the damper mass (74, 80) is arranged radially inside of a radially outer circumference (90) of the conversion unit (20).

8. The torque transmitting device (10) according to any one of the preceding claims, 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 accommodated on the damper mass carrier (72) designed as a pendulum mass carrier (78) in a manner deflectable to a limited extent along a pendulum path.

9. The torque transmitting device (10) according to any one of the preceding claims, characterized in that a torque converter lock-up clutch (50) and / or a torsional vibration damper (52) is arranged inside of the torque converter (36) and radially inside of the conversion unit (20).