Torque transmission device and drive train device

Abstract

The invention relates to a torque transmission device (52) for a hybrid drive train of a vehicle, having a first torque input (54) which can be rotated about an axis of rotation (18) and has at least one first input component (56), a second torque input (58) which acts parallel to the first torque input (54), a torque output (70) having at least one output component (72), and a switchable coupling device (78) which connects the second torque input (58) to the torque output (70) in a torque-transmitting manner depending on a switching state, wherein the coupling device (78) is designed as a switchable freewheel (80). The invention also relates to a drive train device (10).

Description

[0001] Torque transmission device and drive train device

[0002] Description introduction

[0003] The invention relates to a torque transmission device according to the preamble of claim 1. Furthermore, the invention relates to a drive train device with such a torque transmission device.

[0004] US 2020232515 A1 describes a torque transmission device for a hybrid transmission having a first torque input, a second torque input, and a torque output with an output shaft. A switchable dog clutch is operatively arranged between the second torque input and the torque output. The first torque input is permanently connected to the torque output.

[0005] The object of the present invention is to make the torque transmission device more robust and cost-effective. The energy loss during operation of the torque transmission device is to be reduced.

[0006] At least one of these objects is achieved by a torque transmission device having the features of claim 1. As a result, the torque transmission device can be designed more reliably and in a more space-saving manner. The drivetrain device can be operated more efficiently.

[0007] The vehicle can be a motor vehicle, a goods vehicle or a two-wheeled vehicle.

[0008] The hybrid powertrain may comprise a P2 hybrid arrangement. A drive element, in particular an electric motor, may provide a torque at the first torque input. The torque provided at the first torque input may be a drive torque for propelling the vehicle. Another drive element, in particular an internal combustion engine, may provide a torque at the second torque input. The torque provided at the second torque input may be a (further) drive torque for propelling the vehicle. The torque output may output the torque toward at least one vehicle wheel of the vehicle. The torque transmission device may act as a knock-out clutch. The torque output may be connectable to a downstream transmission.

[0009] The torque transmission device can be arranged in an interior space defined by a housing. The electric motor can be arranged within the housing.

[0010] The second torque input can be rotatable about the rotation axis. The torque output can be rotatable about the rotation axis.

[0011] The first torque input can be connected to the torque output in a torque-transmitting manner, independently of the coupling device. The first torque input and the torque output can be continuously connected to one another during operation of the torque transmission device, in particular by positive, material, and / or frictional engagement.

[0012] Depending on the switching state of the clutch device, the torque received via the first and second torque inputs can be diverted at the torque output, particularly toward the transmission. The torque received via the first torque input can be diverted at the torque output, regardless of the switching state.

[0013] The switchable freewheel can be switched electrically, electromagnetically, pneumatically and / or hydraulically.

[0014] In a preferred embodiment of the invention, it is advantageous if the switchable freewheel has a freewheel and a switching device which connects the second torque input to the torque output, in particular the output component, in a torque-transmitting manner by bridging the freewheel depending on a switching position of the switching device. The freewheel can couple the second torque input to the torque output in a torque-transmitting manner in a first relative direction of rotation between the second torque input and the torque output, and can decouple the second torque input from the torque output with respect to torque transmission in an opposite second relative direction of rotation between the second torque input and the torque output, thus enabling a relative rotation between the second torque input and the torque output.The freewheel can implement the torque-transmitting connection, which is dependent on the relative direction of rotation, via a plurality of clamping components, in particular clamping bodies, which makes the freewheel a clamping body freewheel, or rollers, which makes the freewheel a roller freewheel. The switching device allows the second torque input to be connected to the torque output in a torque-transmitting manner, independent of the first and second relative directions of rotation, in particular acting parallel to the freewheel.

[0015] The switching position of the switching device can determine the switching state of the clutch device. The switching state can depend on the switching position.

[0016] In a specific embodiment of the invention, it is advantageous if the switching device is arranged opposite the freewheel with respect to the first input component, in particular axially. The first input component can be arranged axially between the switching device and the freewheel.

[0017] A preferred embodiment of the invention is advantageous in that the switching device comprises an actuator that can change the switching position. The actuator can be actuated electrically, electromagnetically, hydraulically, and / or pneumatically. The actuator can have a displaceable actuator element that is displaceable, in particular axially movable, depending on the switching position. The actuator can have a magnetic coil. The actuator element can be displaceable depending on the electrical operation of the magnetic coil to change the switching position.

[0018] In a preferred embodiment of the invention, the switching device comprises an actuating element that can be displaced to change an actuating position depending on the switching position, and a switching element coupled thereto that establishes the torque-transmitting connection between the second torque input and the output component depending on the actuating position. The actuating element can be axially displaceable. The switching element can be axially displaceable depending on the actuating element. The switching element can be in direct contact with the actuating element depending on the actuating position.

[0019] The actuating element and / or the switching element can be resettable by at least one return spring. The return spring can move the actuating element into an actuating position in which the torque-transmitting connection between the second torque input and the torque output via the switching element is eliminated.

[0020] The actuating element can be rotatable relative to the actuator element. An actuating bearing can be operatively arranged between the actuator element and the actuating element. In a preferred embodiment of the invention, it is advantageous if the actuating element extends axially through the first input component. The first input component can have a through-opening through which the actuating element extends axially.

[0021] In an advantageous embodiment of the invention, the switching element has a conical friction region for frictionally establishing the torque-transmitting connection between the second torque input and the torque output, depending on the actuating position. In a first actuating position, the frictionally engaged torque-transmitting connection between the second torque input and the torque output can be interrupted via the switching element. In a different second actuating position, the frictionally engaged torque-transmitting connection between the second torque input and the torque output can be frictionally established via the switching element.

[0022] In a specific embodiment of the invention, it is advantageous if the conical friction region is formed by a conical first friction surface on the switching element and a conical second friction surface on the torque output, which is frictionally connected thereto depending on the actuating position. The first friction surface can be arranged radially inward on the switching element and the second friction surface radially outward on the torque output, or vice versa. The second friction surface can be arranged axially offset from the freewheel. The second friction surface can be arranged radially at least partially overlapping the freewheel, in particular the clamping components.

[0023] A preferred embodiment of the invention is advantageous in which the second friction surface is formed on the output component. The second friction surface can be arranged radially outward, in particular on an outer circumference, of the output component.

[0024] Furthermore, within the scope of the invention, a drive train device with the features of claim 10 is proposed to achieve at least one of the aforementioned objects. The drive train device can be a hybrid module.

[0025] The electric motor can be arranged together with the first torque input within an interior space spanned by the housing.

[0026] The coupling device can be arranged at least partially, preferably completely, axially overlapping the rotor and / or radially within the rotor. Further advantages and advantageous embodiments of the invention will become apparent from the description of the figures and the illustrations.

[0027] Character description

[0028] The invention is described in detail below with reference to the figures. They show in detail:

[0029] Figure 1: A cross-section of a drive train device in a specific embodiment of the invention.

[0030] Figure 2: A cross-section of the torque transmission device from Figure 1.

[0031] Figure 1 shows a cross-section of a drivetrain device in a specific embodiment of the invention. The drivetrain device 10 is arranged in a hybrid drivetrain of a vehicle and comprises an electric motor 12 for providing at least one drive torque for propelling the vehicle. The electric motor 12 comprises a stator 16 fixed to a housing 14 and a rotor 20 rotatable relative to the stator about a rotational axis 18.

[0032] A further electric motor 22 with a further stator 24 fixed to the housing 14 and a further rotor 26 rotatable relative to the stator about the rotational axis 18 is arranged in the same interior space 28 defined by the housing 14 as the electric motor 12.

[0033] The stator 16 and the additional stator 24 are firmly connected to the housing 14 by screw elements 30. The housing 14 is preferably multi-part, here two-part, with a first housing part 32, to which the stator 16 is attached, and a second housing part 34, to which the additional stator 24 is attached.

[0034] An output element 36 connected to a crankshaft of an internal combustion engine is toothed to a drive hub 40 via a flexplate 38. The drive hub 40 is mounted on the second housing part 34 by a bearing element 42. The drive hub 40 is fixedly connected to a rotor carrier 44 of the further rotor 26. A rotary encoder 46 of a position sensor 48 is arranged on the rotor carrier 44. The position sensor 48 is fastened to the second housing part 34. The further rotor 26 is connected to the output element 36 of the internal combustion engine in a torque-transmitting manner via the rotor carrier 44, the drive hub 40, and the flexplate 38.

[0035] The rotor 20 is mounted on a rotor carrier 50. A torque transmission device 52 is arranged within the interior space 28. The torque transmission device 52 comprises a first torque input 54, rotatable about the rotational axis 18, having a first input component 56 formed by the rotor carrier 50. The torque transmission device 52 further comprises a second torque input 58, rotatable about the rotational axis 18, to which a torque transmitted via the drive hub 40 and / or the rotor carrier 44 of the further rotor 26 is applied. The second torque input 58 comprises a second input component 60, which is connected in a torque-transmitting manner to an output hub 62 of a torsional vibration damper 64. The torsional vibration damper 64 comprises two damper stages 66 arranged in series, each of which has coil springs 68, preferably compression springs or arc springs.

[0036] The torque transmission device 52 comprises a torque output 70 with an output component 72 that can be connected to an output shaft in a torque-transmitting manner. The rotor carrier 50 of the rotor 20 is connected to the output component 72 in a torque-transmitting manner by a toothing 74. The output component 72 is mounted on the housing 14 via a further bearing element 76.

[0037] The torque transmission device 52 has a switchable clutch device 78, which is operatively arranged between the second torque input 58 and the torque output 70 and which connects the second torque input 58 to the torque output 70 in a torque-transmitting manner depending on a switching state of the clutch device 78. The torque transmission device 52 is described in more detail below with reference to Figure 2.

[0038] Figure 2 shows a cross-section of the torque transmission device from Figure 1. The torque transmission device 52 comprises the first torque input 54 with the first input component 56, the second torque input 58 with the second input component 60, the torque output 70 with the output component 72 and the clutch device 78.

[0039] The clutch device 78 comprises a switchable freewheel 80, having a freewheel 82 which couples the second torque input 58 to the torque output 70 in a first relative direction of rotation between the second torque input 58 and the torque output 70 in a torque-transmitting manner and, in an opposite second relative direction of rotation between the torque input and the torque output 70, decouples the second torque input 58 from the torque output 70 with respect to torque transmission and thus enables a relative rotation between the second torque input 58 and the torque output 70.

[0040] The freewheel 82 comprises a plurality of clamping components 84, which are frictionally connected to an outer sleeve 86 for co-rotation in the first relative direction of rotation and are decoupled from the outer sleeve 86 for relative rotation in the second relative direction of rotation. The outer sleeve 86 is fixedly connected to the second input component 60.

[0041] The switchable freewheel 80 comprises a switching device 88 for bridging the freewheel 82 by torque-transmittingly connecting the second torque input 58 to the output component 72 depending on a switching state of the clutch device 78. Depending on a switching position of the switching device 88, the second torque input 58 can be torque-transmittingly connected to the torque output 70, independent of the relative direction of rotation and the freewheel 82. The switching position of the switching device 88 determines the switching state of the clutch device 78.

[0042] The switching device 88 is arranged axially opposite the freewheel 82 with respect to the rotor carrier 50 of the rotor. The switching device 88 comprises an electrically operable actuator 90, in particular with a magnetic coil 92, which can change the switching position. The actuator 90 comprises an axially displaceable actuator element 94, which is coupled to an actuating element 98 via an actuating bearing 96 and which transmits an axial actuating movement to the actuating element 98 via the actuating bearing 96. The actuating element 98 is thus axially displaceable depending on the actuator element 94 to change an actuating position, wherein the actuating element 98 extends axially through the first input component 56, here the rotor carrier 50. The rotor carrier 50 has at least one through-opening 100 through which the actuating element 98 extends axially. The switching position specifies the existing actuating position.

[0043] The actuating element 98 is connected to the first input component 56 for co-rotation. The actuating bearing 96 decouples the actuating element 98 from the actuator element 94 with respect to rotational movement, but on the other hand enables an axial coupling between the actuator element 94 and the actuating element 98. A switching element 104, which establishes the torque-transmitting connection between the second torque input 58 and the output component 72, is coupled to the actuating element 98. The torque-transmitting connection between the second torque input 58 and the output component 72 depends on the actuating position.

[0044] The switching element 104 has a conical friction region 106 for establishing the torque-transmitting connection between the second torque input 58 and the output component 72, depending on the actuating position. The conical friction region 106 is formed by a conical first friction surface 108 on the switching element 104 and a conical second friction surface 110 on the output component 72, which is frictionally connected thereto depending on the actuating position. The first friction surface 108 is arranged radially inward on the switching element 104, and the second friction surface 110 is arranged radially outward on the output component 72.

[0045] The switching element 104 can be reset toward the actuator 90 by a first return spring 112, in particular a wave spring, which is operatively arranged between the switching element 104 and the second input component 60. The actuating element 98 can be reset toward the actuator 90 by a second return spring 114, in particular a wave spring, which is operatively arranged between the actuating element 98 and the first input component 56.

[0046] The first input component 56 has an axial section radially inward, on which the toothing 74 formed with the output component 72 is formed. The first input component 56 is axially secured relative to the output component 72 by a retaining ring 116.

[0047] List of reference symbols

[0048] 10 Drivetrain device

[0049] 12 electric motor

[0050] 14 housings

[0051] 16 Stator

[0052] 18 axis of rotation

[0053] 20 rotors

[0054] 22 additional electric motors

[0055] 24 additional stators

[0056] 26 additional rotor

[0057] 28 Interior

[0058] 30 screw element

[0059] 32 first housing part

[0060] 34 second housing part

[0061] 36 Output element

[0062] 38 Flexplate

[0063] 40 drive hub

[0064] 42 bearing element

[0065] 44 rotor carrier

[0066] 46 encoders

[0067] 48 Position sensor

[0068] 50 rotor arms

[0069] 52 Torque transmission device

[0070] 54 first torque input

[0071] 56 first input component

[0072] 58 second torque input

[0073] 60 second input component

[0074] 62 Output hub -I Q-

[0075] Torsional vibration damper damper stage coil spring

[0076] Torque output

[0077] Output component

[0078] Gearing additional bearing element clutch device switchable freewheel freewheel

[0079] clamping component

[0080] Outer sleeve

[0081] switching device

[0082] Actuator

[0083] magnetic coil

[0084] Actuator element

[0085] Actuating bearing

[0086] Actuating element

[0087] passage opening

[0088] Switching element conical friction area first friction surface second friction surface first return spring second return spring

[0089] Retaining ring

Claims

Patent claims 1. Torque transmission device (52) for a hybrid drive train of a vehicle, comprising a first torque input (54) rotatable about an axis of rotation (18) with at least one first input component (56), a second torque input (58) acting parallel to the first torque input (54), a torque output (70) with at least one output component (72) and a switchable clutch device (78) connecting the second torque input (58) to the torque output (70) in a torque-transmitting manner depending on a switching state, characterized in that the clutch device (78) is designed as a switchable freewheel (80).

2. Torque transmission device (52) according to claim 1, characterized in that the switchable freewheel (80) has a freewheel (82) and a switching device (88) which connects the second torque input (58) to the torque output (70) in a torque-transmitting manner by bridging the freewheel (82) depending on a switching position of the switching device (88).

3. Torque transmission device (52) according to claim 2, characterized in that the switching device (88) is arranged opposite the freewheel (82) with respect to the first input component (56).

4. Torque transmission device (52) according to claim 2 or 3, characterized in that the switching device (88) comprises an actuator (90) which can change the switching position.

5. Torque transmission device (52) according to one of claims 2 to 4, characterized in that the switching device (88) comprises an actuating element (98) which is displaceable for changing an actuating position depending on the switching position and a torque-transmitting connection between the second Torque input (58) and torque output (70) producing switching element (104).

6. Torque transmission device (52) according to claim 5, characterized in that the actuating element (98) extends axially through the first input component (56).

7. Torque transmission device (52) according to claim 5 or 6, characterized in that the switching element (104) has a conical friction region (106) for the frictional torque-transmitting connection between the second torque input (58) and the torque output (70) depending on the actuating position.

8. Torque transmission device (52) according to claim 7, characterized in that the conical friction region (106) is formed by a conically extending first friction surface (108) on the switching element (104) and a conically extending second friction surface (110) on the torque output (70) which is frictionally connected thereto depending on the actuating position.

9. Torque transmission device (52) according to claim 8, characterized in that the second friction surface (110) is formed on the output component (72).

10. Drive train device (10) for a hybrid drive train of a vehicle, comprising an electric motor (12) with a stator (16) and a rotor (20) rotatable relative thereto about an axis of rotation (18), a torque transmission device (52) according to one of the preceding claims, wherein the rotor (20) is connected to the first torque input (54) for providing a torque at the first torque input (54).

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