Torsional vibration damper with conical connecting teeth

Abstract

The invention relates to a torsional vibration damper (10) for torque transmission and reduction of torsional vibrations, comprising a first damper component (16) rotatable about an axis of rotation (14), at least one spring element (24), a second damper component (28) rotatable about the axis of rotation (14) and rotatable relative to the first damper component (16) against the spring force of the spring element (24), a first axial damper side (44) and a second axial damper side (48) opposite in the axial direction (46), a damper element (50) which can be toothed to a connecting component (54) for torque transmission via a connecting toothing (52), wherein the damper element (50) has a first toothed section (62) tapering conically, i.e., radially tapering in the axial direction (46) with at least one angle of inclination (60), which connects to a second toothed section (64) of the The connecting component (54) forms the connecting toothing (52).

Description

[0001] The invention relates to a torsional vibration damper according to the preamble of claim 1.

[0002] DE 10 2018 123 388 A1 describes a torsional vibration damper designed as a dual-mass flywheel with a first damper component rotatable about a rotational axis, a plurality of spring elements, and a second damper component rotatable about the rotational axis, which can be rotated to a limited extent relative to the first damper component against the spring force of the spring element. A damper element designed as an output hub is connected via connecting gearing to a connecting component, for example, a shaft of a dual clutch, for torque transmission.

[0003] To connect the damper element to the shaft, the connecting gear teeth typically have circumferential tooth play, which can lead to rattling. Particularly during idle operation with low torque to be transmitted, this tooth play can cause flank changes in the connecting gear teeth, resulting in annoying noises. Over the long term, the connecting gear teeth can even be subject to critical wear.

[0004] DE 10 2020 105 608 A1 describes a torsional vibration damper with a damper input section and a damper output section designed as a hub with hub toothing. The hub toothing has circumferential openings into which elastic elements are inserted. These elements have radially inner toothings that adjoin the hub toothing on the circumferential side. A shaft inserted radially inside the hub engages with external toothing in the hub toothing and the toothing, thus enabling circumferential centering of the shaft relative to the hub through the toothing.

[0005] The objective of the present invention is to provide a backlash-free connection for the connecting gearing. The torsional vibration damper should be designed cost-effectively and with minimal installation space. Furthermore, the number of components of the torsional vibration damper should be reduced.

[0006] At least one of these objects is achieved by a torsional vibration damper having the features of claim 1. This allows the connecting gearing to be designed to be free of play in the circumferential direction, yet still be axially interlockable and enable torque transmission. The connecting gearing can be designed more robustly. The torque transmittable via the connecting gearing can thus be higher.

[0007] The torsional vibration damper can be arranged in a vehicle, preferably in a drive train. The torsional vibration damper can be a dual-mass flywheel. The torsional vibration damper can be arranged in a torque-transmitting manner between a drive element, for example, an internal combustion engine, and an output element, for example, a transmission. With respect to the torsional vibration damper, the drive element can be arranged axially on the first damper side, and the output element can be arranged axially on the second damper side.

[0008] The torsional vibration damper can be connected to an electric motor, in particular to a rotor carrier of the electric motor, via the connecting component.

[0009] The first damper component can be a damper input part.

[0010] The first axial damper side can be a damper input side.

[0011] The second damper component can be a damper output component. A reverse arrangement is also possible, in which the first damper component forms the damper output component and the second damper component forms the damper input component.

[0012] The second axial damper side can be a damper output side.

[0013] The spring element can be a helical spring, in particular a bow spring.

[0014] The axial direction runs in a direction parallel to the axis of rotation.

[0015] The damper element can be an output hub or be directly connected to it. The damper element and the second damper component can be connected to one another in a form-fitting, non-positive, and / or material-fitting manner, in particular as a one-piece assembly. The damper element and the second damper component can be connected to one another in a form-fitting, non-positive, and / or material-fitting manner, in particular as a one-piece assembly.

[0016] The connecting component can be a shaft, in particular a transmission input shaft. The connecting component can be a toothed element that is firmly connected to the shaft, in particular the transmission input shaft. The connecting component can be axially attached to the shaft at the front end or pressed onto it. The connecting component can transfer the torque from the torsional vibration damper.

[0017] The connecting teeth can form the interface on the damper output side.

[0018] The first toothing region can have a first number of teeth. The second toothing region can have a second number of teeth. The first and second numbers of teeth are preferably the same.

[0019] The first and second toothing areas are each conical, i.e. they taper radially in the axial direction with at least one angle of inclination.

[0020] In a preferred embodiment of the invention, it is advantageous if the first toothed region extends radially tapered in a first direction of the axial direction facing the first axial damper side. A reverse axial extension, in which the first toothed region extends radially tapered in a second direction of the axial direction facing away from the first axial damper side, is also feasible.

[0021] In an advantageous embodiment of the invention, the second toothing region can be axially plugged together with the first toothing region in the direction of the first axial damper side to form the connecting toothing. This establishes the positive connection between the first and second toothing regions.

[0022] In a preferred embodiment of the invention, it is advantageous if the first toothing region is an internal toothing and the second toothing region is an external toothing. A reverse embodiment is also possible, in which the first toothing region is an external toothing and the second toothing region is an internal toothing.

[0023] In a preferred embodiment of the invention, it is advantageous if the second toothing region can be axially inserted radially within the first toothing region to form the connecting toothing. As a result, the first and second toothing regions are arranged axially overlapping and radially within one another.

[0024] A preferred embodiment of the invention is advantageous in which the connecting gearing is a spline gearing. The connecting gearing can also have a helical gearing.

[0025] In a specific embodiment of the invention, it is advantageous if the first toothed area is axially movable relative to the second toothed area to a limited extent, counter to the spring force of a spring component. This allows for limited axial movement between the first and second toothed areas.

[0026] Tests have shown that the spring component should preferably have a spring deflection in the axial direction of less than or equal to 2 mm. The spring component can be a disc spring, in particular a disc spring diaphragm.

[0027] In an advantageous embodiment of the invention, the spring component is arranged outside of the connecting toothing. The spring component can be effectively arranged between the damper element and the first damper component.

[0028] In a preferred embodiment of the invention, it is advantageous if the damper element has a cylindrical outer surface radially opposite the first toothed area, by which the damper element is connected to the second damper component. The damper element can be connected to the second damper component via the outer surface in a form-fitting, force-fitting, and / or material-fitting manner.

[0029] In an advantageous embodiment of the invention, the angle of inclination of the first toothing region is equal to the angle of inclination of the second toothing region. This ensures that the tooth flanks lie flat against each other, preventing jamming.

[0030] Further advantages and advantageous embodiments of the invention emerge from the description of the figures and the illustrations. Character description

[0031] The invention is described in detail below with reference to the figures. They show in detail: Fig. 1: A cross-section of a torsional vibration damper in a special embodiment of the invention. Fig. 2: A cross-section of a torsional vibration damper in another specific embodiment of the invention.

[0032] Fig. 1 shows a cross-section of a torsional vibration damper in a specific embodiment of the invention. The torsional vibration damper 10 is arranged, in particular, in a vehicle to reduce torsional vibrations and is preferably designed as a dual-mass flywheel 12. The torsional vibration damper 10 comprises a first damper component 16, here a damper input part 18, rotatable about a rotational axis 14, comprising a primary flywheel 20 and a cover element 22 attached thereto. Furthermore, a plurality of spring elements 24, here arc springs 26, are accommodated within a damper interior defined by the primary flywheel 20 and the cover element 22.

[0033] A second damper component 28, which is rotatable about the rotation axis 14, can be rotated to a limited extent relative to the first damper component 16, counter to the spring force of the spring element 24. The second damper component 28 is a damper output part 30 and comprises a curved spring flange 32 and an output flange 34. The curved spring flange 32 and the output flange 34 are firmly connected to one another with rivet elements 36. A centrifugal pendulum 38 is arranged on the curved spring flange 32. The curved spring flange 32 forms a pendulum flange 40, on which several pendulum masses 42 are mounted, capable of limited deflection along a pendulum track.

[0034] A first axial damper side 44 is on the damper input side, here as the left side of the torsional vibration damper 10, and a second axial damper side 48 opposite in the axial direction 46 is on the damper output side, here as the right side of the torsional vibration damper 10.

[0035] A damper element 50 is connected to a connecting component 54 via a connecting toothing 52 for torque transmission. The connecting component 54 is attached to the end face of a shaft 56, in particular a transmission input shaft. The damper element 50 is firmly connected to the output flange 34 by a cylindrical outer surface 58. The connecting toothing 52 is conical, i.e., tapering radially in the axial direction 46 with at least one angle of inclination 60, between a conical first toothing region 62 of the damper element 50 and a conical second toothing region 64 of the connecting component 54. This allows the connecting toothing 52 to be designed to be free of play in the circumferential direction.

[0036] The connecting toothing 52 extends radially tapered, i.e., constricted, in a first direction 66 of the axial direction 46 facing the first axial damper side 44. The first toothing region 62 is an internal toothing 68, and the second toothing region 64 is an external toothing 70. The first toothing region 62 is arranged radially opposite the outer circumferential surface 58. The angle of inclination 60 of the first toothing region 62 is equal to the angle of inclination 60 of the second toothing region 64. The number of teeth in the first toothing region 62 is preferably equal to the number of teeth in the second toothing region 64.

[0037] The second toothing region 64 can be axially plugged together with the first toothing region 62, starting from the second axial damper side 48 in the direction of the first axial damper side 44, to form the connecting toothing 52. In particular, the second toothing region 64 can be axially inserted radially within the first toothing region 62 to form the connecting toothing 52. The connecting toothing 52, designed, for example, as a spline shaft toothing 72, can be constructed by inserting the connecting component 54 with the conical external toothing 70 as the second toothing region 64 into the damper element 50 with the conical internal toothing 68 as the first toothing region 62. In this case, the connecting component 54 reaches an axial limitation formed by the conical design of the first toothing region 62 in the first direction 66 of the axial direction 46 due to the conical design of the second toothing region 64.

[0038] Fig. Figure 2 shows a cross-section of a torsional vibration damper in another specific embodiment of the invention. The torsional vibration damper 10 is designed as a dual-mass flywheel 12 and is similar to the one shown in Fig. 1. Therefore, only the essential features will be discussed below.

[0039] The arc spring flange 32 is connected to the output flange 34 via rivet elements 36. The output flange 34 has an axially angled inner section 74 to which the damper element 50 is attached.

[0040] The first toothed region 62 is axially movable relative to the second toothed region 64, counter to the spring force of a spring component 76. The spring component 76 is arranged outside of the connecting toothing 52 and is designed as a disc spring membrane 78, which is arranged between the arc spring flange 32 and the cover element 22 and, for example, influences friction between the first and second damper components 16, 28 during relative rotation. List of reference symbols 10 torsional vibration dampers 12 Dual-mass flywheel 14 axis of rotation 16 first damper component 18 Damper input part 20 Primary flywheel 22 Cover element 24 spring element 26 bow spring 28 second damper component 30 Damper output part 32 Bow spring flange 34 Output flange 36 rivet element 38 centrifugal pendulum 40 pendulum flange 42 pendulum mass 44 first axial damper side 46 Axial direction 48 second axial damper side 50 damper element 52 connecting gearing 54 Connection component 56 Wave 58 Outer surface 60 tilt angle 62 first gearing area 64 second gearing area 66 first direction 68 internal gearing 70 external gearing 72 spline shaft 74 Interior section 76 spring component 78 disc spring diaphragm QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2018 123 388 A1

[0002] DE 10 2020 105 608 A1

[0004]

Claims

[1] Torsional vibration damper (10) for torque transmission and reduction of torsional vibrations, comprising a first damper component (16) rotatable about a rotation axis (14), at least one spring element (24), a second damper component (28) rotatable about the rotation axis (14) and rotatable to a limited extent relative to the first damper component (16) against the spring force of the spring element (24), a first axial damper side (44) and a second axial damper side (48) opposite in the axial direction (46), a damper element (50) which can be connected via a connecting toothing (52) to a connecting component (54) for torque transmission, characterized by , that the damper element (50) has a first toothing region (62) which runs conically, i.e. tapers radially in the axial direction (46) with at least one angle of inclination (60), and which forms the connecting toothing (52) with a conically running second toothing region (64) of the connecting component (54). [2] Torsional vibration damper (10) according to claim 1, characterized by that the first toothing region (62) tapers radially in a first direction (66) of the axial direction (46) facing the first axial damper side (44). [3] Torsional vibration damper (10) according to claim 1 or 2, characterized by that the second toothing region (64) can be axially plugged together with the first toothing region (62) in the direction of the first axial damper side (44) to form the connecting toothing (52). [4] Torsional vibration damper (10) according to one of the preceding claims, characterized bythat the first toothing region (62) is an internal toothing (68) and the second toothing region (64) is an external toothing (70). [5] Torsional vibration damper (10) according to one of the preceding claims, characterized by that the second toothing region (64) can be inserted axially radially within the first toothing region (62) to form the connecting toothing (52). [6] Torsional vibration damper (10) according to one of the preceding claims, characterized by that the connecting toothing (52) is a spline toothing (72). [7] Torsional vibration damper (10) according to one of the preceding claims, characterized by that the first toothed region (62) is axially movable to a limited extent relative to the second toothed region (64) against the spring force of a spring component (76). [8] Torsional vibration damper (10) according to claim 7, characterized by that the spring component (76) is arranged outside of the connecting toothing (52). [9] Torsional vibration damper (10) according to one of the preceding claims, characterized by that the damper element (50) has a cylindrical outer surface (58) radially opposite the first toothed region (62), with which the damper element (50) is connected to the second damper component (28). [10] Torsional vibration damper (10) according to one of the preceding claims, characterized by that the angle of inclination (60) of the first toothing region (62) is equal to the angle of inclination (60) of the second toothing region (64).

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