Torque transmission device and hybrid device

Abstract

Torque transmission device (14) for transmitting a torque emanating from a drive element (12), comprising a coupling element (38) fixedly connected to the drive element (12) via a coupling region (36) and a connection element (46) connected in a rotationally fixed manner to a rotor (22) of an electric motor (18) via a connection region (52), characterized in that the coupling element (38) and the connection element (46) are connected in a rotationally fixed manner via a connection region (44), and thus the drive element (12) and the rotor (22) are connected in a rotationally fixed and torsionally rigid manner, wherein the coupling element (38) and / or the connection element (46) are each constructed from at least three transmission elements (58, 58.1, 58.2, 58.3) which are connected in series with respect to the torque transmission and of which at least one transmission element (58.1) is designed to be radially flexible between the coupling region (36) and the connection region (52) and as a result the rotor (22) is radially movable relative to the drive element (12).

Description

[0001] The invention relates to a torque transmission device according to the preamble of claim 1. Furthermore, the invention relates to a hybrid device with such a torque transmission device.

[0002] A torque transmission device is known, for example, from WO 2017 / 186227 A1. The torque transmission device is arranged in a drive train of a vehicle and comprises an electric motor with a stator and a rotor rotatable relative to the stator about a rotational axis, and a torsional vibration damper with a damper input part connected to a drive element and a damper output part rotatable to a limited extent relative to the damper input part and connected to the rotor via a separating clutch.

[0003] Further prior art is referred to DE 10 2020 116 011 A1 and DE 10 2016 014 724 A1.

[0004] The object of the present invention is to decouple the drive element from the rotor with respect to vibrations and movements that deviate from a rotational movement, and to compensate for tolerances between the drive element and the rotor. Furthermore, the torque that can be transmitted via the torque transmission device is to be increased. The torque transmission device is to be designed in a more cost-effective and space-saving manner.

[0005] At least one of these objects is achieved by a torque transmission device having the features of claim 1. This allows tolerances and radial misalignment between the drive element and the rotor to be compensated. Vibrations and movements of the drive element, which originate, for example, from the drive element and are transmitted via the torque transmission device, can be decoupled from the electric motor. The electric motor can be operated more efficiently. The torque transmission device can be designed more cost-effectively and with less installation space.

[0006] The air gap between the stator and rotor can be adjusted and maintained more precisely. The rotor bearings can be improved.

[0007] The vehicle can be a hybrid vehicle. The drive element can be an internal combustion engine. The drive element can have a crankshaft that is connected to the coupling element via the coupling region in a rotationally fixed manner. The coupling element can be connected to the drive element, preferably to the crankshaft, in a form-fitting, force-fitting, and / or material-fitting manner.

[0008] The torque transmission device may be operatively arranged between the input element and an output element, for example a gearbox, for torque transmission.

[0009] The rotor can have a rotor active region and a rotor carrier that supports the rotor active region, which is electromagnetically coupled to a stator active region of the stator. The rotor carrier can be rigidly connected to the rotor active region, in particular, constructed as a single piece. Permanent magnets and / or electrically conductive coil windings can be arranged on the rotor active region. The rotor active region can be arranged radially inside or outside the stator active region.

[0010] The connecting element can be firmly connected to the rotor carrier via the connecting area, in particular, it can be constructed as a single piece. The rotor carrier can have a hub or shaft. The connecting element can be connected to the rotor, preferably to the rotor carrier, in a form-fitting, force-fitting, and / or material-fitting manner.

[0011] The coupling element and / or the connecting element can be arranged axially between the drive element and the electric motor. The connecting element and / or the coupling element can have a flywheel to increase the mass inertia and reduce torsional vibrations of the drive element. A torsional vibration damper between the drive element and the rotor can be omitted. If a torsional vibration damper is used, it is preferably arranged downstream of the rotor toward an output side.

[0012] The coupling element can be designed to be radially and / or axially stiffer than the connecting element with respect to corresponding movements between the drive element and the rotor. The connecting element can be designed to be radially and / or axially stiffer than the coupling element with respect to corresponding movements between the drive element and the rotor.

[0013] The coupling element and / or the connecting element can be disc-shaped. The coupling element and the connecting element can be arranged concentrically to one another. The connecting element can be arranged axially between the coupling element and the rotor.

[0014] The transmission elements can be firmly connected to one another. The transmission elements can be connected to one another in a form-fitting, force-fitting, and / or material-fitting manner. The transmission elements can be screwed or riveted to one another. The transmission elements can be arranged axially next to one another. At least one transmission element, preferably all transmission elements, can be disc-shaped. The transmission elements can be arranged as a disc pack. The transmission elements can be arranged so as to at least partially radially overlap one another. The transmission elements can be connected to one another in a series arrangement, in which adjacent transmission elements are connected to one another.

[0015] The transmission elements can be identical or similar in design. The transmission elements can be stamped.

[0016] In a preferred embodiment of the invention, it is advantageous if at least two of the transmission elements are each designed to be radially flexible between the coupling region and the connection region. The two transmission elements can be arranged directly axially adjacent to one another or spaced apart. A further transmission element can be arranged axially between the two transmission elements.

[0017] In a preferred embodiment of the invention, it is advantageous if the two radially flexible transmission elements are constructed in the same part and are arranged so as to be rotated relative to one another by an offset angle about the rotation axis. One of the two transmission elements can be radially flexible along a first radial direction. The other of the two transmission elements can be radially flexible along a second radial direction, rotated by the offset angle relative to the first radial direction.

[0018] A preferred embodiment of the invention is advantageous in which the offset angle is 90°. This allows decoupling between the drive element and the rotor in any radial direction.

[0019] A preferred embodiment of the invention is advantageous in that at least one of the transmission elements is radially stiffer than the radially flexible transmission element with respect to a radial displacement between the coupling region and the connection region. Preferably, two of the transmission elements are radially flexible, and another transmission element is radially stiffer than the two transmission elements. The radially stiffer transmission element can also be axially stiffer than at least one of the other transmission elements.

[0020] In an advantageous embodiment of the invention, the radially flexible transmission element comprises flexible spring means for limited radial movement between the coupling region and the connection region against the restoring force of the spring means. The transmission element comprising the spring means can comprise a circumferentially closed ring arranged radially outside the spring means.

[0021] In a specific embodiment of the invention, it is advantageous if the spring means are designed as a single piece with the radially flexible transmission element. The spring means can be designed as at least one single web, integral with the radially flexible transmission element. The web can connect the connection areas, via which the radially flexible transmission element is connected to components arranged on either side thereof, in a torque-transmitting and at least radially movable manner. The spring means can make the transmission element radially flexible.

[0022] The individual web can have at least one first web section extending in a first direction of extent. The individual web can additionally have at least one second web section extending in a second direction of extent. The spring means can have at least two webs formed integrally with the transmission element. One of the webs can comprise the first web section and the other of the webs can comprise the second web section. The web can be formed integrally with the radially flexible transmission element.

[0023] In an advantageous embodiment of the invention, at least one of the transmission elements, preferably the radially flexible transmission element, is axially flexible, allowing the rotor to be axially movable relative to the drive element. This allows axial movements and axial offset between the drive element and the rotor to be compensated. The radially and axially flexible transmission element can compensate for wobbling movements between the drive element and the rotor.

[0024] In a preferred embodiment of the invention, the coupling region and / or the connection region are arranged radially within the connection region. The coupling region and the connection region can be arranged radially overlapping or spaced apart.

[0025] Furthermore, at least one of the above-mentioned objects is achieved by a hybrid device with an electric motor having a rotor and a torque transmission device having at least one of the features described above.

[0026] Further advantages and advantageous embodiments of the invention emerge from the description of the figures and the illustrations. Character description

[0027] The invention is described in detail below with reference to the figures. They show in detail: Fig. 1: A half-section of a hybrid device with a torque transmission device in a special embodiment of the invention Fig. 2 to 5: A schematic half-section of a torque transmission device in a respective specific embodiment of the invention. Fig. 6: A side view of a torque transmission device in another specific embodiment of the invention. Fig. 7: A side view of a transmission element of a torque transmission device in another specific embodiment of the invention. Fig. 8: A spatial view of a transmission element of a torque transmission device in another specific embodiment of the invention. Fig. 9: A side view of a transmission element of a torque transmission device in another specific embodiment of the invention. Fig. 10: A side view of a transmission element of a torque transmission device in another specific embodiment of the invention.

[0028] Fig. 1 shows a half-section of a hybrid device with a torque transmission device in a specific embodiment of the invention. The hybrid device 10 is arranged in a drive train of a vehicle between a drive element 12, in particular an internal combustion engine, and an output, for example a transmission, and comprises a torque transmission device 14 for transmitting a torque generated by the internal combustion engine and applied to a crankshaft 16 to the output, and an electric motor 18 with a rotor 22 rotatable about a rotational axis 20 and a stator 24 fixed to the housing.

[0029] The rotor 22 is mounted on a housing component 28 via a rotor carrier 26 and two bearing elements 30. The housing component 28 is firmly connected to a housing 32, in particular, as a single piece. A sealing element 34 is arranged between the housing component 28 and the rotor carrier 26.

[0030] The drive element 12, here the crankshaft 16, is firmly connected to a coupling element 38 via a coupling region 36. The coupling region 36 comprises a screw connection 40 with at least one screw element 42, which is designed as a screw. The coupling element 38 is connected in a rotationally fixed manner to a connecting element 46 via a connecting region 44. The connecting region 44 comprises a screw connection 48 with at least one screw element 50. The screw element 50 is designed as a screw. The coupling element 38 is firmly and thus also rotationally fixedly connected to the connecting element 46 via the connecting region 44.

[0031] The connecting element 46 is connected to the rotor carrier 26 in a rotationally fixed manner via a connecting region 52. The connecting region 52 can have a screw connection 54 with at least one screw element 56. The screw element 56 is designed as a screw. The connecting region 52 can also have a spline or axial spline. In this case, the connecting element 46 can have a spline, and the rotor carrier 26 or a component connected thereto in a rotationally fixed manner can have counter-spline engaging with the spline for torque transmission. The connecting element 46 is preferably firmly connected to the rotor carrier 26 or a component firmly connected thereto via the connecting region 52.

[0032] The coupling region 36 and the connection region 52 are arranged radially inside the connection region 44. The coupling region 36 and the connection region 52 are arranged radially spaced from one another. The connection element 46 is constructed from three transmission elements 58 that are connected to one another in a rotationally fixed manner and are connected in series with respect to torque transmission, of which a first transmission element 58.1 and a second transmission element 58.2 are designed to be radially flexible and effective between the coupling region 36 and the connection region 52. As a result, the rotor 22 is radially movable relative to the drive element 12, and tolerances and, in particular, a radial axial offset between the drive element 12 and the rotor 22 can be compensated. Vibrations and movements of the drive element 12 that are transmitted via the connection element 46 can be decoupled from the electric motor 18.The air gap between the rotor 22 and the stator 24 can be made smaller despite the tolerances between the drive element 12 and the rotor 22.

[0033] The first and second transmission elements 58.1, 58.2 are arranged axially spaced from one another, and a third transmission element 58.3 is arranged axially between the first and second transmission elements 58.1, 58.2. The third transmission element 58.3 is radially stiffer than the first and second transmission elements 58.1, 58.2. The first transmission element 58.1 is firmly connected to the coupling element 38 via the connecting region 44. The first transmission element 58.1 is further firmly connected to the third transmission element 58.3 via a connection region 60, for example via a riveted connection. The second transmission element 58.2 is firmly connected to the third transmission element 58.3 via a further connection region 60, for example via a riveted connection. The second transmission element 58.2 is firmly connected to the rotor carrier 26 via the connection region 52.

[0034] The first and second transmission elements 58.1, 58.2 are connected to each other exclusively via the third transmission element 58.3. Torque is thus transmitted from the drive element 12 to the rotor carrier 26 from the first transmission element 58.1 via the third transmission element 58.3 to the second transmission element 58.2.

[0035] Preferably, the first and second transmission elements 58.1, 58.2 are designed to be radially and axially flexible. The first and second transmission elements 58.1, 58.2 are also axially softer than the third transmission element 58.3 and the coupling element 38. This allows axial movements and axial offset between the drive element 12 and the rotor 22 to be compensated. The radially and axially flexible first and second transmission elements 58.1, 58.2 can compensate for wobbling movements between the drive element 12 and the rotor 22.

[0036] The first and second transmission elements 58.1, 58.2 are preferably constructed from the same parts and arranged rotated relative to one another by an offset angle about the rotation axis 20. The offset angle can be 90°. The first transmission element 58.1 has spring means (not visible here) for limited radial and axial movement between the coupling element 38 and the third transmission element 58.3 against the restoring force of the spring means, via which the first transmission element 58.1 is designed to be radially and axially flexible. The spring means are operatively arranged between the connecting region 44 and the connecting region 60, via which the first transmission element 58.1 is firmly connected to the third transmission element 58.3. Accordingly, the second transmission element 58.2 has the spring means, which are operatively arranged between the connecting region 60, via which the second transmission element 58.2 is connected to the third transmission element 58.3 and are arranged in the connection area 52. Due to the offset angle, the spring means of the first and second transmission elements 58.1, 58.2 are also offset by 90° from one another and accordingly act in mutually perpendicular directions. This allows for the compensation of radial axis offset and radial vibrations between the drive element 12 and the rotor 22 in any radial direction.

[0037] Fig. 2 to 5 shows a schematic half-section of a torque transmission device in a respective specific embodiment of the invention. In Fig. 2 shows a torque transmission device 14 in which the coupling element 38 is connected in a rotationally fixed manner to the crankshaft 16 of the drive element 12 and, via the connecting region 44, to the connecting element 46. The connecting element 46 is connected in a rotationally fixed manner to the rotor carrier 26 via the connecting region 52. The connecting element 46 comprises the first, second, and third transmission elements 58.1, 58.2, 58.3. The first and second transmission elements 58.1, 58.2, 58.3 are designed to be at least radially flexible. The third transmission element 58.3 is designed to be radially stiffer than the first and second transmission elements 58.1, 58.2, and is arranged axially between the first and second transmission elements 58.1, 58.2, between the coupling region 36 and the connecting region 52, and is operatively arranged between the first and second transmission elements 58.1, 58.2.

[0038] In Fig. 3 shows a torque transmission device 14 in which the second and third transmission elements 58.2, 58.3 are designed to be radially flexible so that the drive element 12 is radially movable relative to the rotor carrier 26. The first transmission element 58.1 is designed to be radially stiffer than the second and third transmission elements 58.2, 58.3.

[0039] In Fig. 4 shows a torque transmission device 14 in which the first and third transmission elements 58.1, 58.3 are radially flexible and the second transmission element 58.2 is radially stiffer.

[0040] Fig. Figure 5 shows a torque transmission device 14 in which the coupling element 38 has the first, second, and third transmission elements 58.1, 58.2, 58.3. The connecting element 46 is fixedly connected to the second transmission element 58.2 and to the rotor carrier 26. The first transmission element 58.1 is fixedly connected to the crankshaft 16 of the drive element 12. The first and second transmission elements 58.1, 58.2 can be arranged similarly to Fig. 2 can be designed to be radially flexible and the third transmission element 58.3 can be designed to be radially stiffer.

[0041] The Fig. 2 to 4 described embodiments of the first, second and third transmission elements 58.1, 58.2, 58.3 can also be used in the Fig. 5 illustrated coupling element 38 can be implemented alternatively.

[0042] Fig. 6 shows a side view of a torque transmission device in another specific embodiment of the invention. The torque transmission device 14 comprises the connecting element 46 shown here as an example. The first transmission element 58.1 of the connecting element 46 has recesses 62 for a rivet connection for implementing the connection region 60. The spring means 63 are operatively arranged between the connection region 44 and a connection region 60, via which the first transmission element 58.1 is connected to the third transmission element 58.3, which is designed to be radially stiffer here and in which the spring means are omitted.

[0043] The spring means 63 are formed integrally with the first transmission element 58.1 and are each configured as five flexible webs 64 that interconnect the connecting region 44 and the attachment region 60 in a torque-transmitting and radially movable manner. The webs 64 can thus make the first transmission element 58.1 radially flexible. The individual web 64 has at least one first web section 68 extending in a first extension direction 66. This provides radial mobility between the coupling element and the third transmission element via the first transmission element 58.1 along a first radial direction 70.

[0044] During a radial displacement along the first radial direction 70 between the coupling element and the third transmission element 58.3, the webs 64 act like bending beams and, due to their small cross-section, generate only small restoring forces. During a displacement in a second radial direction 72 perpendicular to the first radial direction 70, the webs 64 are stiff or stiffer than in the first radial direction 70, so that a movement originating from the coupling element is directly transmitted to the third transmission element 58.3.

[0045] In order to also compensate for displacements along the second radial direction 72, the second transmission element, which is hidden here, is constructed in the same way as the first transmission element 58.1 and is rotated by 90 degrees to the first transmission element 58.1 so that the webs of the second transmission element run perpendicular to the webs 64 of the first transmission element 58.1. The webs of the second transmission element are thus flexible when displaced along the second radial direction 72 and rigid when displaced along the first radial direction 70. With the combination of the webs of the first and second transmission elements, displacement in any radial direction and preferably also in the axial direction 74 can be compensated. Nevertheless, the connecting element 46 remains torsionally rigid in the circumferential direction.

[0046] To rivet the third transmission element 58.3 to the second transmission element via the connection area 60, riveting is carried out through the first transmission element 58.1, for which purpose recesses 62 are provided. The connection between the coupling element and the first transmission element 58.1 via the connection area 44 can be achieved by riveting. To minimize friction, the riveting can be located on a stamped dome 76, for example. As a result, contact between the coupling element and the first transmission element 58.1 will only occur in this area. Alternatively, the use of intermediate elements, such as discs, is possible.

[0047] A greater distance between the transmission elements 58 is to be avoided in particular, since this promotes the twisting of the transmission elements 58 due to the axial offset between the force introduction points and force discharge points.

[0048] Fig. 7 shows a side view of a transmission element of a torque transmission device in another specific embodiment of the invention. The transmission element 58 of the torque transmission device 14 has spring means 63, each with three webs 64, which are connected at the ends, on the one hand, to the transmission element 58 and, on the other hand, to the connection area 60 for connection to another component, for example, the coupling element. This prevents twisting in the riveted connection of the connection area 60. With only one connection point, however, the riveted connection would be subjected to torsional forces. The webs 64 can, if necessary, be designed to be stress-optimized and have a variable cross-section.

[0049] Fig. 8 shows a three-dimensional view of a transmission element of a torque transmission device in another specific embodiment of the invention. The transmission element 58 of the torque transmission device 14 has spring means 63, each of which is constructed from a twisted web 64. As a result, the web width of the individual web 64 can be greater than the component thickness of the preferably stamped transmission element 58. To enable an axial spacing between the transmission element 58 and an axially adjacent component, domes 76 are attached to the connection areas 60. These can be attached alternatively or additionally to the axially adjacent component, for example, to another transmission element.

[0050] Fig. Figure 9 shows a side view of a transmission element of a torque transmission device in another specific embodiment of the invention. The transmission element 58 of the torque transmission device 14 has spring means 63 with an optimized web geometry. In order to distribute the stresses as evenly as possible across all flexible webs 64, these are designed to be of different lengths. At a given angle of rotation, this ensures that the strain and thus the stresses are equal due to the different distances of the webs 64 from the center of rotation.

[0051] Fig.10 shows a side view of a transmission element of a torque transmission device in another specific embodiment of the invention. The transmission element 58 of the torque transmission device 14 has spring means 63 with a buckling-proof web geometry of the webs 64. To reduce the risk of buckling, in this embodiment the connection area 60, in particular for riveting, is arranged in the center of the webs 64. In the event of rotation, one side of the webs 64 is always subjected to tensile stress, thus preventing buckling of the webs 64. List of reference symbols 10 Hybrid device 12 Drive element 14 Torque transmission device 16 Crankshaft 18 Electric motor 20 axis of rotation 22 Rotor 24 Stator 26 rotor arms 28 Housing component 30 bearing element 32 housings 34 Sealing element 36 Coupling area 38 coupling element 40 screw connection 42 screw element 44 Connection area 46 connecting element 48 screw connection 50 screw element 52 Connection area 54 screw connection 56 screw element 58 transmission element 58.1 first transmission element 58.2 second transmission element 58.3 third transmission element 60 connection area 62 recess 63 spring means 64 jetty 66 first direction of extension 68 first bridge section 70 first radial direction 72 second radial direction 74 axial direction 76 Cathedral

Claims

[1] Torque transmission device (14) for transmitting a torque emanating from a drive element (12), comprising a coupling element (38) fixedly connected to the drive element (12) via a coupling region (36) and a connection element (46) connected in a rotationally fixed manner to a rotor (22) of an electric motor (18) via a connection region (52), characterized byin that the coupling element (38) and the connecting element (46) are connected to one another in a rotationally fixed manner via a connecting region (44), and thus the drive element (12) and the rotor (22) are connected to one another in a rotationally fixed and torsionally rigid manner, wherein the coupling element (38) and / or the connecting element (46) is each constructed from at least three transmission elements (58, 58.1, 58.2, 58.3) which are connected to one another in a rotationally fixed manner and which are connected in series with respect to the torque transmission, and of which at least one transmission element (58.1) is designed to be radially flexible between the coupling region (36) and the connecting region (52), and as a result the rotor (22) is radially movable relative to the drive element (12). [2] Torque transmission device (14) according to claim 1, characterized by that at least two of the transmission elements (58) are each designed to be radially flexible between the coupling region (36) and the connection region (52). [3] Torque transmission device (14) according to claim 2, characterized by that the two radially flexible transmission elements (58) are constructed in the same part and are arranged rotated relative to one another by an offset angle about the axis of rotation (20). [4] Torque transmission device (14) according to claim 3, characterized by that the offset angle is 90°. [5] Torque transmission device (14) according to one of the preceding claims, characterized by that at least one of the transmission elements (58.3) is designed to be radially stiffer than the radially flexible transmission element (58.1) with respect to a radial displacement between the coupling region (36) and the connection region (52). [6] Torque transmission device (14) according to one of the preceding claims, characterized bythat the radially flexible transmission element (58.1) has flexible spring means (63) for limited radial movement between the coupling region (36) and the connection region (52) against the restoring force of the spring means (63). [7] Torque transmission device (14) according to claim 6, characterized by that the spring means (63) are designed as one piece with the radially flexible transmission element (58.1). [8] Torque transmission device (14) according to one of the preceding claims, characterized by that at least one of the transmission elements (58), preferably the radially flexible transmission element (58.1), is axially flexible and thus the rotor (22) is axially movable relative to the drive element (12). [9] Torque transmission device (14) according to one of the preceding claims, characterized bythat the coupling region (36) and / or the connection region (52) is arranged radially within the connection region (44). [10] Hybrid device (10) with an electric motor (18) having a rotor (22) and a torque transmission device (14) according to one of the preceding claims.

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