Torsional vibration damper with an axial spring element and friction element

Abstract

Torsional vibration damper (10) for reducing torsional vibrations, comprising a first damper element (16) rotatable about a rotation axis (14) with a cover element (20), at least one spring element (24), a second damper element (28) which is rotatable about the axis of rotation (14) and which can be rotated to a limited extent relative to the first damper element (16) against the action of the spring element (24), an output component (44) which is coupled to the second damper element (28) in a rotationally fixed manner and which outputs a torque transmitted via the spring element (24) and the second damper element (28), a friction element (50) acting as a friction between the first damper element (16) and the second damper element (28), an axial spring element (48) fastened to the second damper element (28) and designed as a disc spring membrane, wherein the friction element (50) is subjected to an axial force (52) of the axial spring element (48) acting in the direction of the cover element (20), and wherein the friction element (50) is frictionally rotatable relative to the first damper element (16) to form a friction region (56) and is directly connected to the output component (44) in a rotationally fixed manner such that a first form-locking element (68) of the friction element (50) is connected to a second form-locking element (70) on the output component (44) in a form-locking manner, characterized in that the first form-locking element (68) extends radially inside the cover element (20), and in that the second form-locking element (70) is designed as a circumferential recess (72) on an outer circumference of the output component (44), wherein the circumferential recess (72) is arranged radially inside the cover element (20) and axially overlapping the cover element (20), and in that the friction element (50) has a radial section (62) from which the first form-locking element (68) extends axially away, wherein the first form-locking element (68) extends from the radial section (62) radially inside the cover element (20) in the axial direction and is designed as a circumferentially delimited projection (76).

Description

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

[0002] DE 10 2018 130 872 A1 describes a torsional vibration damper comprising an input part and an output part that can rotate together about a rotational axis and can be rotated relative to each other to a limited extent. Arc springs, a friction ring, and a disc spring diaphragm act between the input and output parts.

[0003] DE 10 2012 202 255 A1 describes a dual-mass flywheel with a primary part, several arc springs, and a secondary part. The secondary part comprises a flange connected to a hub via a two-part disc assembly. Frictional relative rotation is achieved via a friction device including a friction pad between the disc assembly and a cover of the primary part.

[0004] DE 102 06 647 A1 discloses a torsional vibration damper for reducing torsional vibrations, which has a first damper element and a second damper element rotatable against the action of a spring element. The first damper element is an input element, which can be fastened to a drive motor, for example, with screws. An output element of the second damper element, which is connected to the spring element via flange wings, transmits the torque to a hub. The hub is provided on the output side for connection to a clutch or transmission shaft. The flange-shaped output element is arranged axially centrally between an input plate and a cover element of the first damper element and is radially divided into two parts. A central part of the output element extends radially from a hub to a separation point, at which the central part and an outer part are connected to one another via a toothing.On both sides of the output element, friction elements are arranged at the separation point, either frictionally abutting the input plate or abutting the cover element in such a way that they radially overlap the separation point and secure the connection between the middle part and the outer part of the output element.

[0005] An axial spring element inserted between the output element and the first friction element is designed as a disc spring and preloads the friction element axially against the input plate. The disc spring also preloads the second friction element frictionally towards the cover element through a reaction of the spring force. The friction elements are positively connected to the output element and can be rotated frictionally relative to the first damper element. The positive-locking, rotationally fixed connection is established via corresponding form-locking elements. Axial pins are formed on the respective first friction element. The second form-locking elements are introduced as through holes in the output element and receive the pins in a form-locking manner. Pins or pockets are also optionally formed on the second friction element.Rivet heads of rivets engage in the pockets on the second friction element, with which the connection between the middle and outer part of the output element is made.

[0006] DE 10 2018 123 744 A1 discloses a torsional vibration damper for reducing torsional vibrations, comprising a first damper element and a second damper element rotatable against the action of a spring element. The first damper element is an input element attached to a crankshaft. An output element of the second damper element, which bears against the spring element, transmits the torque to a hub. The hub is provided on the output side for connection to a clutch or transmission shaft. The second damper element is provided with a flange-like output element, which engages the spring element with its flange wings. Furthermore, the second damper element has a centrifugal pendulum absorber. The output element and the centrifugal pendulum absorber are attached to a hub of the output element with rivets.A friction element is frictionally preloaded against the input element near a radially inner edge of a cover of the first damper element.

[0007] An axial spring element inserted between the output element and the first friction element is designed as a disc spring and preloads the friction element axially against the cover. The disc spring also preloads a second friction element frictionally toward a primary plate of the input element through the reaction of the spring force. The positive, rotationally fixed connection is established via corresponding positive locking elements. Axial pins are formed on the first friction element. The second positive locking elements are inserted as through holes in the output element and positively accommodate the pins.

[0008] Another torsional vibration damper disclosed in DE 10 2018 123 744 A1 has a first damper element and a second damper element rotatable against the action of a spring element. The first damper element is an input element attached to a crankshaft. An output element of the second damper element, which bears against the spring element, transmits the torque to a hub. The hub is provided on the output side for connection to a clutch or transmission shaft. The second damper element is provided with a flange-like output element, which engages the spring elements with flange vanes. Furthermore, the second damper element has a centrifugal pendulum absorber. The output element and the centrifugal pendulum absorber are attached to a hub of the output element by means of a riveted connection. The centrifugal pendulum absorber is arranged radially below the housing of the first damper element.In addition, an axial spring element, designed as a disc spring diaphragm, is attached to the second damper element and is riveted to the hub at its inner circumference. Radially outward, the disc spring diaphragm is axially preloaded against a friction element guided on the cover.

[0009] The object of the present invention is to adjust the friction between the first and second damper elements more precisely. The friction should be more consistent. The components of the torsional vibration damper should be designed more reliably. The torsional vibration damper should be designed more cost-effectively and with less installation space.

[0010] At least one of these objects is achieved by a torsional vibration damper having the features of claim 1. This allows the friction between the first and second damper elements to be adjusted more precisely. The friction can be more consistent.

[0011] The torsional vibration damper is arranged in a vehicle. The torsional vibration damper can be arranged in a drive train of the vehicle. The torsional vibration damper can be effectively arranged between a drive element, in particular an internal combustion engine, and an output element, in particular a transmission.

[0012] The torsional vibration damper can be designed for wet or dry operation. The torsional vibration damper can have a damper interior in which the spring elements are arranged. The damper interior can be at least partially filled with a lubricant, in particular a lubricating grease.

[0013] The first damper element may be a damper input element and the second damper element may be a damper output element.

[0014] The torsional vibration damper can have multiple spring elements. The spring elements can be distributed circumferentially. The spring element can be a compression spring or a bow spring.

[0015] The axial spring element can be designed as a disc spring or disc spring diaphragm.

[0016] The friction element can be designed as a friction ring. The friction element can be made of a different material than the axial spring element and / or the first damper element. The friction element can be made of a plastic. A direct positive connection between the friction element and the axial spring element can be omitted. The friction element can be axially fixed between the axial spring element and the first damper element by the axial force of the axial spring element. The friction element can be axially displaceable at most against the axial force of the axial spring element. The friction element is permanently in axial contact with the first damper element. The friction element causes a basic hysteresis between the first and second damper elements. The friction element is in direct, frictionally effective, rotatable contact with the first damper element. The friction element is arranged axially between the axial spring element and the first damper element.

[0017] The output component can be a sheet metal component. The output component can be an output hub. The output component can be connected to a connecting component, for example, a transmission input shaft. The output component and the connecting component can be positively connected to one another. The output component can have connecting teeth for torque-transmitting connection to the connecting component.

[0018] The output component can be connected to the second damper element in a form-fitting, force-fitting, and / or material-fitting manner. The output component can be connected to the second damper element by at least one rivet element.

[0019] The axial spring element exerts the axial force on the friction element in the direction of the first damper element. With respect to the axial force, the friction element is arranged between the axial spring element and the first damper element. The axial spring element can be frictionally rotatable relative to the first damper element with the interposition of the friction element. The axial spring element can be rotationally fixedly connected to the friction element via the rotationally fixed, positive connection of the friction element and the output component, the rotationally fixed coupling of the output component to the second damper element, and the fastening of the axial spring element to the second damper element. The axial spring element and the friction element can be rotationally fixedly connected to one another via this indirect connection.

[0020] In an advantageous embodiment of the invention, the axial spring element rests against a coupling region of the friction element for introducing the axial force onto the friction element. This allows the friction region to be clamped with the axial force.

[0021] In a preferred embodiment of the invention, the friction region comprises a friction surface on the friction element, which is arranged axially opposite the coupling region. The friction surface and the coupling region can be arranged radially overlapping.

[0022] The friction surface is arranged on an axial side of the friction element facing the cover element. The first damper element, like the cover element, has a counter friction surface frictionally coupled to the friction surface. The friction surface and the counter friction surface form the friction zone.

[0023] According to the invention, the friction element comprises at least a first positive-locking element, which is positively connected to a second positive-locking element on the output component. The first positive-locking element extends radially within the cover element. The first positive-locking element is arranged axially overlapping the cover element. The first positive-locking element is designed as a circumferentially delimited projection.

[0024] Furthermore, according to the invention, the second form-locking element is designed as a circumferential recess in the output component. The second form-locking element is formed on an outer circumference of the output component. The outer circumference is arranged radially within the cover element. The second form-locking element is arranged axially overlapping the cover element. The outer circumference is arranged axially at least partially overlapping the cover element.

[0025] According to the invention, the friction element has a radial section from which the first form-locking element extends axially. Starting from the radial section, the first form-locking element extends primarily in the axial direction. The first form-locking element can extend radially inward from the radial section.

[0026] A preferred embodiment of the invention is advantageous in which the torsional vibration damper is a dual-mass flywheel, the first damper element comprises a primary flywheel and the cover element, and the friction element is frictionally rotatable relative to the cover element to form the friction region.

[0027] Further advantages and advantageous embodiments of the invention emerge from the description of the figures and the illustration.

[0028] Further advantages and advantageous embodiments of the invention emerge from the description of the figures and the illustrations. Character description

[0029] The invention is described in detail below with reference to the figures. They show: Fig. 1: A half-section of a torsional vibration damper in a special embodiment of the invention. Fig. 2: A section of the torsional vibration damper from Fig. 1.

[0030] Fig. 1 shows a half-section of a torsional vibration damper in a specific embodiment of the invention. The torsional vibration damper 10 is designed to reduce torsional vibrations between a drive element, for example, an internal combustion engine, and an output element, for example, a transmission, and is designed as a dual-mass flywheel 12. The torsional vibration damper 10 comprises a first damper element 16 rotatable about a rotational axis 14, having a primary flywheel 18 and a cover element 20 rigidly connected thereto. The first damper element 16 defines a damper interior 22 in which several spring elements 24, preferably arc springs 26, are accommodated.

[0031] A second damper element 28 is rotatable about the rotation axis 14 and can be rotated to a limited extent relative to the first damper element 16, counter to the action of the spring elements 24. The second damper element 28 comprises a curved spring flange 30 directly coupled to the spring elements 24 for transmitting force, and a torque limiter 32 for limiting the maximum transmitted torque.

[0032] The torque limiter 32 comprises a torque limiter input 34 formed in one piece with the arc spring flange 30 and a torque limiter output 36 connected to the torque limiter input 34 in a pre-tensioned frictionally engaged manner.

[0033] The torque limiter output 36 comprises a first disc part 38 and a second disc part 40 axially spaced therefrom. The torque limiter input 34 is received axially between the first and second disc parts 38, 40. The first and second disc parts 38, 40 are firmly connected to one another via at least one rivet element 42 and to an output component 44, which transfers a torque transmitted from the torsional vibration damper 10 via the spring element 24, the second damper element 28, and the torque limiter 32. The output component 44 has a connecting toothing 46 radially on the inside for a positive connection to a connecting component, for example, a transmission input shaft. The output component 44 is rotationally fixedly coupled to the second damper element 28 via the rivet element 42.

[0034] An axial spring element 48 is firmly connected to the second damper element 28 and the output component 44 via the rivet element 42. The axial spring element 48 applies an axial force 52 to a friction element 50, which acts in the direction of the cover element 20. The friction element 50 is frictionally active between the first and second damper elements 16, 28 and is designed as a friction ring 54, which can be frictionally rotated relative to the first damper element 16, forming a friction region 56.

[0035] The axial spring element 48 is designed as a disc spring diaphragm 58, which bears against a coupling region 60 of a radial section 62 of the friction element 50 in a force-applying manner. The axial spring element 48 is frictionally rotatable relative to the first damper element 16 with the interposition of the friction element 50. The axial force 52 exerted by the axial spring element 48 is directed toward the first damper element 16. The friction element 50 is arranged between the axial spring element 48 and the first damper element 16, here the cover element 20, with respect to the axial force 52.

[0036] Fig. 2 shows a section of the torsional vibration damper from Fig. 1. On an axial side of the friction element 50 axially opposite the coupling region 60, a friction surface 64 is arranged, which is frictionally coupled to a counter friction surface 66 on the cover element 20.

[0037] The friction element 50 is directly connected to the output component 44 in a rotationally fixed, form-fitting manner. For this purpose, a first form-fitting element 68 of the friction element 50 is connected to a second form-fitting element 70 on the output component 44. The first form-fitting element 68 extends radially within the cover element 20. The second form-fitting element 70 is designed as a circumferential recess 72 in the output component 44. The circumferential recess 72 is formed on an outer circumference 74 of the output component 44 and is arranged radially within the cover element 20 and axially overlapping the cover element 20.

[0038] The first form-locking element 68 extends from the radial section 62 radially within the cover element 20, primarily in the axial direction. The first form-locking element 68 is preferably designed as a circumferentially delimited projection 76.

[0039] The axial spring element 48 is connected in a rotationally fixed manner to the friction element 50 via the rotationally fixed, positive connection of the friction element 50 and the output component 44, the rotationally fixed coupling of the output component 44 to the second damper element 28, and the fastening of the axial spring element 48 to the second damper element 28. The axial spring element 48 and the friction element 50 are rotationally fixedly connected to one another via this indirect connection. List of reference symbols 10 torsional vibration dampers 12 Dual-mass flywheel 14 axis of rotation 16 first damper element 18 Primary flywheel 20 cover element 22 Damper interior 24 spring element 26 bow spring 28 second damper element 30 Bow spring flange 32 torque limiters 34 Torque limiter input 36 Torque limiter output 38 first disc part 40 second disc part 42 rivet element 44 Output component 46 connecting teeth 48 axial spring element 50 friction element 52 Axial force 54 Friction ring 56 friction area 58 disc spring diaphragm 60 coupling range 62 Radial section 64 Friction surface 66 Counter friction surface 68 first form-locking element 70 second form-locking element 72 circumferential recess 74 outer circumference 76 lead

Claims

[1] Torsional vibration damper (10) for reducing torsional vibrations, comprising a first damper element (16) rotatable about a rotation axis (14) with a cover element (20), at least one spring element (24), a second damper element (28) which is rotatable about the axis of rotation (14) and which can be rotated to a limited extent relative to the first damper element (16) against the action of the spring element (24), an output component (44) which is coupled to the second damper element (28) in a rotationally fixed manner and which outputs a torque transmitted via the spring element (24) and the second damper element (28), a friction element (50) acting as a friction between the first damper element (16) and the second damper element (28), an axial spring element (48) fastened to the second damper element (28) and designed as a disc spring membrane, wherein the friction element (50) is subjected to an axial force (52) of the axial spring element (48) acting in the direction of the cover element (20), and wherein the friction element (50) is frictionally rotatable relative to the first damper element (16) to form a friction region (56) and is directly connected to the output component (44) in a rotationally fixed manner such that a first form-locking element (68) of the friction element (50) is connected to a second form-locking element (70) on the output component (44) in a form-locking manner, characterized byin that the first form-locking element (68) extends radially inside the cover element (20), and in that the second form-locking element (70) is designed as a circumferential recess (72) on an outer circumference of the output component (44), wherein the circumferential recess (72) is arranged radially inside the cover element (20) and axially overlapping the cover element (20), and in that the friction element (50) has a radial section (62) from which the first form-locking element (68) extends axially, wherein the first form-locking element (68) extends from the radial section (62) radially inside the cover element (20) in the axial direction and is designed as a circumferentially delimited projection (76). [2] Torsional vibration damper (10) according to claim 1, characterized by that the axial spring element (48) can be rotated in a frictionally effective manner relative to the first damper element (16) with the interposition of the friction element (50). [3] Torsional vibration damper (10) according to one of the preceding claims, characterized by that the axial spring element (48) bears against a coupling region (60) of the friction element (50) for introducing the axial force (52) onto the friction element (50). [4] Torsional vibration damper (10) according to claim 3, characterized by that the friction region (56) comprises a friction surface (64) on the friction element (50) which is arranged axially opposite the coupling region (60). [5] Torsional vibration damper (10) according to claim 4, characterized by that the friction surface (64) is arranged on an axial side of the friction element (50) facing the cover element (20). [6] Torsional vibration damper (10) according to one of the preceding claims, characterized by that the friction element (50) has a radial section (62) from which the first form-locking element (68) extends axially away. [7] Torsional vibration damper (10) according to one of the preceding claims, characterized bythat the torsional vibration damper (10) is a dual-mass flywheel (12), the first damper element (16) comprises a primary flywheel (18) and the cover element (20), and the friction element (50) is frictionally rotatable relative to the cover element (20) to form the friction region (56).

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