Torque limiter with single-sided friction lining and torsional vibration damper

Abstract

The invention relates to a torque limiter (24) for limiting a maximum transmissible torque, comprising a torque limiter input (26) with at least one input flange (28), a torque limiter output (34) frictionally connected to the input flange (28) for transmitting a torque via a friction area (30) loaded by an axial preload force (32), wherein the friction area (30) comprises a first friction pair (42) acting between the input flange (28) and the torque limiter output (34) and arranged on a first axial side (44) of the input flange (28), and a second friction pair (58) arranged on an axially opposite second axial side (56) of the input flange (28), wherein a first friction partner (48) of the first friction pair (42) is a friction lining (50) constructed from a friction material for targeted adjustment of the coefficient of friction, and the second friction pair (58) is free of friction coating.Furthermore, the invention relates to a torsional vibration damper (10).

Description

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

[0002] DE 10 2021 102 701 A1 describes a torque limiter comprising a torque limiter input with a support flange and a torque limiter output with a receptacle. Friction linings are attached to both sides of the support flange and engage with the receptacle. The support flange is axially preloaded relative to the receptacle by a disc spring.

[0003] The object of the present invention is to make the torque limiter more cost-effective and easier to manufacture.

[0004] At least one of these objects is achieved by a torque limiter having the features of claim 1. This allows the torque limiter to be manufactured more cost-effectively and simply. The number of components of the torque limiter is reduced.

[0005] The torque limiter can be arranged in a vehicle. The torque limiter can be arranged in a drive train of the vehicle. The transmitted torque can be a drive torque for propelling the vehicle.

[0006] The torque limiter can be designed as a slip clutch.

[0007] The axial preload force can be achieved by an axial force of a disc spring acting between the torque limiter input and output. The disc spring can be arranged between the torque limiter output and the input flange. The disc spring can be arranged axially between a component of the torque limiter output and the input flange.

[0008] The torque limiter input and output can rotate synchronously when the torque limiter is subjected to a torque limit up to a torque limit, and can rotate against each other when the torque limit is exceeded. The torque that can be transmitted from the torque limiter input to the torque limiter output can depend on the axial preload force that frictionally connects the torque limiter output to the torque limiter input across the friction area. The friction torque provided for transmitting the torque can depend on the axial preload force.

[0009] The torque limiter output may have a first leg and an axially spaced second leg. The input flange may be disposed axially between the first and second legs. The first and / or second leg may be a support disc. The first and / or second leg may be constructed of steel.

[0010] The friction area can be designed to run dry or wet.

[0011] The first and second friction pairings can be arranged radially at least partially, in particular mainly, radially overlapping.

[0012] The second friction pairing is friction-lining-free, meaning it is formed without any friction linings. A second friction partner and second counter friction partner of the second friction pairing are different from a friction lining.

[0013] Targeted friction coefficient adjustment is defined as a measure to adjust the friction coefficient to a specified value or within a specified range. Targeted friction coefficient adjustment can be the primary, or even the exclusive, objective of the friction lining. The friction lining is constructed from a different material than a steel component.

[0014] In a preferred embodiment of the invention, it is advantageous if the first friction pairing has a first counter friction partner, which is frictionally connected to the first friction partner and is made of a different material than the friction lining. This allows the torque limiter to be designed more cost-effectively.

[0015] In an advantageous embodiment of the invention, the first counter friction partner is a steel component. The first counter friction partner can also be another friction lining.

[0016] In a preferred embodiment of the invention, it is advantageous if the frictional contact of the first friction pairing is a friction lining-to-steel contact. This allows the coefficient of friction to be influenced and maintained more consistently by carefully selecting the friction lining.

[0017] In a specific embodiment of the invention, it is advantageous if the friction lining is firmly connected to the input flange. The friction lining can be connected to the input flange in a form-fitting, force-fitting, and / or material-fitting manner. The friction lining can be arranged exclusively on one axial side of the input flange.

[0018] In a specific embodiment of the invention, it is advantageous if the friction lining is firmly connected to the torque limiter output. Another friction lining of the first friction pairing can be firmly connected to the input flange. The friction lining can be firmly connected to a leg or a support disc of the torque limiter output. The friction lining can be firmly connected to a friction disc that is at least rotationally fixedly connected to the torque limiter output.

[0019] In a preferred embodiment of the invention, the input flange is designed as a disc spring flange that itself provides the axial preload force. The first friction pairing can have a first friction contact between the first friction partner and the first counter friction partner. The second friction pairing can have a second friction contact between the second friction partner and the second counter friction partner. The first and second friction contacts can be radially offset.

[0020] In a preferred embodiment of the invention, it is advantageous if the frictional contact of the second friction pair is a steel-on-steel contact. This allows the component requirements of the torque limiter to be reduced.

[0021] Furthermore, within the scope of the invention, a torsional vibration damper with the features of claim 9 is proposed to achieve at least one of the aforementioned objects. The torsional vibration damper can be designed as a dual-mass flywheel. The torsional vibration damper can be designed to be wet or dry-running.

[0022] The damper output can be connected to the input flange in a form-fitting, force-fitting and / or material-locking manner, in particular in one piece.

[0023] The torque limiter output can be permanently connected to an output hub. One leg of the torque limiter output can be integral with the output hub.

[0024] In an advantageous embodiment of the invention, the torque limiter is effectively connected in series downstream of the damper output with respect to torque transmission. The torque limiter can be arranged inside or outside a damper interior that accommodates the spring element. The damper interior can accommodate a lubricant, in particular a lubricating oil or grease.

[0025] Further advantages and advantageous embodiments of the invention emerge from the description of the figures and the illustrations. Character description

[0026] The invention is described in detail below with reference to the figures. They show in detail: Fig. 1: A torsional vibration damper with a torque limiter in a special embodiment of the invention. Fig. 2: A torsional vibration damper with a torque limiter in another specific embodiment of the invention.

[0027] Fig. 1 shows a torsional vibration damper with a torque limiter in a specific embodiment of the invention. The torsional vibration damper 10 is arranged to reduce torsional vibrations in a vehicle drivetrain. The torsional vibration damper 10 is designed, in particular, as a dual-mass flywheel 12 and comprises a damper input 16 rotatable about a rotational axis 14, a plurality of spring elements 18, in particular arc springs, and a damper output 20 rotatable about the rotational axis 14 and rotatable to a limited extent relative to the damper input 16 against the spring force of the spring elements 18. The damper output 20 is preferably a arc spring flange 22.

[0028] A torque limiter 24 is connected in series downstream of the damper output 20 for torque transmission. The torque limiter 24 comprises a torque limiter input 26 with at least one input flange 28, which is integrally formed with the damper output 20, a friction region 30, and a torque limiter output 34, which is frictionally connected to the input flange 28 via the friction region 30 by an axial preload force 32 for transmitting the torque. The axial preload force 32 is generated by an axial force of a disc spring 36. The disc spring 36 is arranged axially between a first leg 38 of the torque limiter output 34 and a friction disc 40.

[0029] The friction region 30 has a first friction pairing 42 on a first axial side 44 of the input flange 28, axially between the input flange 28 and a second leg 46 of the torque limiter output 34. A first friction partner 48 of the first friction pairing 42 is a friction lining 50, preferably firmly connected to the input flange 28. The friction lining 50 is constructed from a friction material for targeted friction coefficient adjustment. The first counter friction partner 52 of the first friction pairing 42 is formed by the second leg 46 as a steel component and is constructed from a different material than the friction lining 50. A friction contact 54 of the first friction pairing 42 is thus, in particular, a friction lining-steel contact.

[0030] The friction region 30 further comprises a second friction pairing 58 on an axially opposite second axial side 56 of the input flange 28. The second friction pairing 58 is friction-lining-free, meaning it is formed without any friction linings, and a friction contact 60 of the second friction pairing 58 is exclusively a steel-to-steel contact. A second friction partner 62 of the second friction pairing 58 is formed by the input flange 28, and a second counter friction partner 64 is formed by the friction disc 40.

[0031] Fig. Figure 2 shows a torsional vibration damper with a torque limiter in another specific embodiment of the invention. The torsional vibration damper 10 compensates for the Fig.1 except for the following differences. The second friction pairing 58 has the friction lining 50, and the first friction pairing 42 is friction-lining-free. The second friction partner 62 of the second friction pairing 58 is the friction lining 50, and the second counter friction partner 64 is the friction disc 40. The friction lining 50 is preferably fixedly connected to the input flange 28. The first friction partner 48 of the first friction pairing 42 is the input flange 28, and the first counter friction partner 52 of the first friction pairing 42 is the second leg 46. List of reference symbols 10 torsional vibration dampers 12 Dual-mass flywheel 14 axis of rotation 16 Damper input 18 spring element 20 Damper output 22 Bow spring flange 24 torque limiters 26 Torque limiter input 28 Inlet flange 30 friction area 32 axial preload force 34 Torque limiter output 36 disc spring 38 first leg 40 friction disc 42 first friction pairing 44 first axial side 46 second leg 48 first friction partner 50 friction lining 52 first counter friction partner 54 Friction contact 56 second axial side 58 second friction pair 60 Friction contact 62 second friction partner 64 second counter friction partner 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 2021 102 701 A1

[0002]

Claims

[1] Torque limiter (24) for limiting a maximum transmittable torque, comprising a torque limiter input (26) with at least one input flange (28), a torque limiter output (34) frictionally connected to the input flange (28) via a friction region (30) loaded by an axial prestressing force (32) for transmitting a torque, wherein the friction region (30) has a first friction pairing (42) acting between the input flange (28) and the torque limiter output (34) and arranged on a first axial side (44) of the input flange (28) and a second friction pairing (58) arranged on an axially opposite second axial side (56) of the input flange (28), characterized by , that a first friction partner (48) of the first friction pairing (42) is a friction lining (50) constructed from a friction material for targeted friction coefficient adjustment and the second friction pairing (58) is friction lining-free. [2] Torque limiter (24) according to claim 1, characterized by that the first friction pairing (42) has a first counter friction partner (52) which is frictionally connected to the first friction partner (48) and is made of a material different from the friction lining (50). [3] Torque limiter (24) according to claim 2, characterized by that the first counter friction partner (52) is a steel component. [4] Torque limiter (24) according to claim 3, characterized by that the friction contact (54) of the first friction pair (42) is a friction lining-steel contact. [5] Torque limiter (24) according to one of claims 1 to 4, characterized by that the friction lining (50) is firmly connected to the input flange (28). [6] Torque limiter (24) according to one of claims 1 to 4, characterized by that the friction lining (50) is firmly connected to the torque limiter output (34). [7] Torque limiter (24) according to one of the preceding claims, characterized by that the input flange (28) is designed as a disc spring flange which itself effects the axial preload force (32). [8] Torque limiter (24) according to one of the preceding claims, characterized by that the friction contact (60) of the second friction pair (58) is a steel-steel contact. [9] Torsional vibration damper (10) for reducing torsional vibrations, comprising a damper input (16) rotatable about a rotation axis (14), at least one spring element (18), a rotatable about the axis of rotation (14) and counter to the spring force of the at least a spring element (18) with a damper output (20) which can be rotated to a limited extent relative to the damper input (16) and a torque limiter (24) according to one of the preceding claims. [10] Torsional vibration damper (10) according to claim 9, characterized bythat the torque limiter (24) is effectively connected in series downstream of the damper output (20) with respect to a transmission of the torque.

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