The present disclosure relates to a friction part with a circular ring disk-like friction body, which has at least one friction surface, and with a coupling body which is used to produce a rotationally fixed connection to the friction part.
Friction parts for use in clutches or brakes are known in a variety of embodiments for both wet and dry applications. For example, a friction plate for wet friction clutch modules for use in automotive powertrains is known from European patent specification EP 1 910 704 B1. From German patent application DE 10 2011 086 523 A1, a friction body is known which can be connected to a friction body carrier. From German patent application DE 10 2016 203 048 A1, a lining carrier for at least one wet friction lining is known, which is formed from a wet friction lining material, the lining carrier comprising a dry friction lining material. From the German patent application DE 10 2018 124 338 A1, a friction disk with a friction body is known, which has at least one friction surface, the friction body being connected to the coupling body in a form-fitting manner.
The present disclosure provides a friction part with a circular ring disk-like friction body, which has at least one friction surface, and with a coupling body, which is used to produce a rotationally fixed connection to the friction part, in that the friction part includes at least one weakened region in which the rigidity of the friction part is reduced in the circumferential direction in a controlled manner such that compensating movements are facilitated between two friction part sections adjoining the weakened region in the circumferential direction. The friction part may be a friction disk, e.g., a clutch disk or a brake disk. The coupling body may be a toothing, for example an internal toothing or an external toothing, which is formed on the friction part. The coupling body, e.g., the toothing, can be formed radially inside or radially outside on the circular ring disk-like friction body. The circular ring disk-like friction body can be attached to a carrier element, for example a carrier plate. In the case of conventional friction disks, the coupling body, e.g., the toothing, is usually formed on the carrier element. In the case of the claimed friction part, the coupling body, e.g., the toothing, can be formed both on the circular ring disk-like friction body and on the carrier element.
In one embodiment of the friction part, the friction part is designed without a carrier element. In an exemplary embodiment, the coupling body is integrally connected, e.g., as a single piece, to the circular ring disk-like friction body. The weakened region of the friction part may produce a flexure beam or a flexure joint in order to facilitate the desired compensating movements. For this purpose, the ring structure of the friction part is partially separated or interrupted in the radial direction. In this way, a tangential rigidity of the friction part can be reduced in a controlled manner. The reduction in the rigidity of the lining structure in the tangential direction can go so far that the friction part is divided into circular ring disk-like friction bodies or segments. When torque is transmitted, the compensating movements facilitate a defined introduction of force into the friction part or from the friction part, for example into a disk carrier which is connected to the friction part in a rotationally fixed manner.
In an exemplary embodiment of the friction part, the friction body is connected to the coupling body as a single piece. In this way, the weight and the mass inertia of the friction part can be reduced. In addition, the production costs can be reduced because a carrier element, e.g., a carrier plate, can be omitted. Furthermore, the assembly of the friction part is simplified. If the friction part is formed from an organic material, any post-processing that would otherwise be required can be omitted.
In another embodiment of the friction part, the friction part is attached to a carrier element. The carrier element is, for example, a carrier plate. If the friction body is connected as a single piece to the coupling body, then the carrier element, e.g., the carrier plate, can simply be designed as a circular ring disk, e.g., without toothing. Depending on the design, the carrier element can however also be designed with a toothing. The friction body is, for example, connected to the carrier element in a bonded manner. The bonded connection can be specifically designed to be so elastic that relative movements between the friction body and the carrier element are facilitated in order to allow the compensating movements described above. Depending on the design, however, the carrier element can also be designed with the same or similar weakened regions as the friction body.
In a further exemplary embodiment of the friction part, the circular ring disk-like friction body has at least one recess which extends outwards from a radially inner peripheral edge of the friction part. The recess, which is embodied, for example, as a groove or as a slot in the circular ring disk-like friction body, may extend radially outwards from the radially inner peripheral edge of the friction part. Depending on the design, the recess can also extend obliquely to a radial line.
In a further exemplary embodiment of the friction part, the circular ring disk-like friction body has at least one recess which extends inward from a radially outer peripheral edge of the friction part. The recess, which is designed, for example, as a groove or as a slot in the circular ring disk-like friction body, may extend radially inward. However, the recess can also extend obliquely to a radial line.
In another embodiment of the friction part, two recesses are arranged on a common radial line and facing each other. A remaining bridge between the recesses may produce a flexure joint between the friction lining sections adjoining in the circumferential direction. In this way, the desired compensating movements can be facilitated with little manufacturing effort.
In a further exemplary embodiment of the friction part, two recesses are offset in a circumferential direction and arranged in an overlapping manner in the radial direction. A remaining bridge between the recesses produces a flexure beam, which facilitates the desired compensating movements between the friction part sections adjoining in the circumferential direction. The recesses are easy to produce in terms of manufacturing technology.
In the case of a friction part with a circular ring disk-like friction body which has at least one friction surface, and with a coupling body which is used to produce a rotationally fixed connection to the friction part, in particular in the case of a friction part described above, the circular ring disk-like friction body may be divided into friction lining pieces, which are each connected as a single piece to a coupling body part. The friction part may have at least two friction lining pieces. The coupling body part is, for example, at least one tooth of a toothing for producing a rotationally fixed connection to a disk carrier. The toothing may be designed as external teeth on the friction part. Here, a connection between the individual friction lining pieces is not required if the friction lining pieces are mounted, for example, in a disk carrier that is designed in a correspondingly complementary manner. In this way, the desired compensating movements can be implemented in a simple manner. Depending on the design, however, the friction lining pieces can also be partially connected to one another. This connection can be made as a single piece. However, the friction lining pieces can also be attached to a carrier element, such as a carrier plate. The friction lining pieces may be in the form of circular ring sectors or segments.
In a further exemplary embodiment of the friction part, the friction lining pieces may each have only two tooth flanks in order to produce the coupling region. The tooth flanks produce part of a toothing in the coupling region. The tooth flanks can be formed on one tooth per friction lining piece. During operation of the friction part, the two tooth flanks engage in a form-fitting manner in a corresponding toothing of the disk carrier. The tooth flanks can be provided both centrally but also on tangential end faces of the coupling body.
In a further exemplary embodiment, two adjoining friction lining pieces are connected to one another by a flexure joint or a flexure beam. Here, the friction lining pieces remain connected to one another. This simplifies handling of the friction part during assembly.
The present disclosure further relates to a clutch or a brake, e.g., a multi-disk clutch or a multi-disk brake, with at least one friction part described above, e.g., with a plurality of such friction parts. The clutch or brake may be operated dry. At least two of the exemplary embodiments described above can also be combined in the clutch or brake. For example, a ring structure can be separated into at least two elements, which are then connected by a joint or flexure beam to increase flexibility.
Further advantages, features and details of the disclosure will be apparent from the following description, in which various exemplary embodiments are described in detail with reference to the drawing. In the figures:
In
A disk pack of the wet multi-disk clutch 1 comprises steel disks 7 and lined disks 8. The lined disks 8 each comprise a lining carrier 9 which is connected to the inner disk carrier 2 in a rotationally fixed manner radially on the inside of a coupling region 10. The coupling region 10 of the lining carrier 9 is designed, for example, as an internal toothing that is mounted with a complementary external toothing of the inner disk carrier 2. Similarly, the steel disks 7 are connected to the outer disk carrier 3 in a rotationally fixed manner, radially on the outside.
Friction linings 11, 12 are attached on both sides of the lining carrier 9, i.e., on the left and right in
The cooling and/or lubricating medium is primarily used for cooling in the wet multi-disk clutch 1. The lined disk 8 with the lining carrier 9 and the two friction linings 11, 12 is also referred to as the friction part 15. The friction part 15 has a friction surface 16 shown on the right in
The friction surface 16 is delimited radially on the inside by an inner radius ri. The friction surface 16 is delimited radially on the outside by an outer radius ra. On the left of
The wet-multi-disk clutch 1 shown in
The coupling body 104 is designed as a toothing 105. The toothing 105 is shown on the friction part 101; 21, 22; 31 and 41 designed as external toothing. Parts of the toothing 105 shown by way of example are referred to as internal tooth 106 and internal tooth 107. The toothing 105 is used for the rotationally fixed connection to the outer disk carrier (3 in
The same reference signs are used in
The coupling body 104 or the toothing 105 is connected as a single piece to the friction body 102.
Two weakened regions 111, 112 on the friction part 1 are indicated in
Two slot-like or groove-like recesses 113, 114 are used to produce the weakened region 111. The recesses 113, 114 extend towards one another in the radial direction from the inner peripheral edge 17 or from the outer peripheral edge 18, respectively. A remaining distance or bridge between the recesses 113, 114 produces a flexure joint 110.
The weakened region 112 includes similar recesses 115, 116. The main difference between the weakened regions 111, 112 is that the recess 114 in
The weakened region 112 is used to produce a flexure joint 19 on the friction body 2. The flexure joints 110, 19 produce single-piece connections between friction part sections or friction lining pieces 54, 55 and 55, 56. Desired compensating movements between the friction part sections or friction lining pieces 54, 55 and 55, 56 are facilitated by the flexure joints 110;19.
The recesses 23, 24; 26, 27 are offset from one another in the circumferential direction and overlapping in the radial direction. This results in a flexure beam 25; 28 between two adjoining friction part sections or friction lining pieces 54, 55. The desired compensating movements between the friction part sections or friction lining pieces 54, 55 can be adjusted in a controlled manner via the shape and size of the flexure beam 25; 28.
In the case of the friction part 31 shown in
In
The region between the tooth flanks 29, 30 produces a coupling body part 39 on the coupling body 104.
The compensating movements on the friction part 41 are illustrated in
An arrow 51 in
Number | Date | Country | Kind |
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10 2020 123 412.0 | Sep 2020 | DE | national |
This application is the United States National Phase of PCT Appln. No. PCT/DE2021/100667 filed Aug. 3, 2021, which claims priority to German Application No. DE1020202123412.0 filed Sep. 8, 2020, the entire disclosures of which are incorporated by reference herein.
Filing Document | Filing Date | Country | Kind |
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PCT/DE2021/100667 | 8/3/2021 | WO |