WO2018014904A1

WO2018014904A1 - Clutch disc having a one-sided steel back, and dual clutch having such a clutch disc

Info

Publication number: WO2018014904A1
Application number: PCT/DE2017/100527
Authority: WO
Inventors: Karl-Ludwig Kimmig
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2016-07-21
Filing date: 2017-06-22
Publication date: 2018-01-25
Also published as: DE112017003631A5; DE102017113792A1

Abstract

The invention relates to a clutch disc (1) for a friction clutch for use in a drive train of a motor vehicle, having a main part (2), which is designed to transmit torque to a shaft (3) and to carry friction linings (4, 5), wherein a friction lining (4, 5) is attached to each of the two end faces (6, 7) of the main part (2), wherein the two friction linings (4, 5) differ from one another structurally, wherein a first friction lining (4) is provided with a steel back (8) facing the main part (2), said steel back (8) not being present on a second friction lining (5) which is attached to the end face, facing away from the first friction lining (4), of the main part (2). The invention also relates to a dual clutch (9) in which a clutch disc (1) of the type according to the invention is used.

Description

Clutch disc with one-sided steel back and double clutch with such a clutch disc

The present invention relates to a clutch disc for a preferably dry friction clutch for use in a drive train of a motor vehicle, such as a car, a truck or other commercial vehicle, with a main part, which is designed for torque transmission to a shaft and for supporting friction linings, wherein In each case a friction lining is attached to both end faces of the main part and the two friction linings differ in structure from one another.

The invention further relates to a preferably dry double clutch, which is constructed from at least two partial clutches. A generic double clutch is known from International Patent Application Publication No. 2012/1 16671 A2. This discloses a double clutch in which at least one clutch disc is arranged. This clutch disc has friction linings that specifically combine different wound or mass-pressed linings in their properties. Thus, the fact that the prevailing on both sides of a clutch disc of the dual clutch in operation temperatures are not equal or might differ more widely, be reacted. Thus, friction linings are used which have different thermal dependencies and are adapted to the prevailing temperatures in each case in order to produce different driving characteristics in a vehicle in which that double clutch is used.

Thus, in the prior art, attention is paid to optimizing a tribological behavior of clutch disks. Furthermore, the basic leitmotiv in the use of different coverings in the prior art that a balance of frictional properties, a so-called compromise formation is achieved. A disadvantage of the known from the prior art clutch discs is that they are not or not sufficiently able to comply with the economic conditions, if correspondingly high demands are placed on a bursting speed.

The object of the present invention is thus, in particular, to design a clutch disc such that it has such mechanical and thermal properties that it ensures high mechanical strength, ie a high bursting speed, at low cost.

This is inventively achieved in that a first friction lining is provided with a main part facing steel back, which is a second friction lining, which is attached to the first friction facing away from the end face of the main part, missing. Thus, a cost and space-optimized clutch disc is created, which is particularly suitable for installation in dry double clutches in multi-disc design. The fact that the steel backing is thus formed on one side of the main part, it is possible to meet high strength requirements and at the same time to keep the weight and costs low.

Further advantageous embodiments are claimed in the subclaims and are explained in more detail below.

So it is advantageous if the first friction lining wound or pressed, for example, mass-pressed, executed. Additionally or alternatively, it is advantageous if the first friction lining with a steel backing providing sheet metal plate is materially connected, preferably glued, is. The wound covering is characterized mainly by its economic production. If the friction lining is mass-pressed, it withstands high strength requirements.

Due to the fact that the first friction lining is glued to a sheet-metal plate positioned on the steel backing, a material-locking connection is produced with low weight, low additional material and optimum space conditions. call, the high (bursting) speeds, and high axial forces reliably withstand.

As soon as the steel back acts as a sheet metal carrier, in addition to increasing the strength, it fulfills the additional function of carrying and locally fixing the friction lining or the friction linings. In this way, the steel back fulfills more than one function, which has a positive effect on the compactness of the clutch disc.

It is also advantageous if the second friction lining is designed wound and / or directly / directly attached to the main body. The wound design results in high economic efficiency as well as the exploitation of existing manufacturing mechanisms. The fact that the second friction lining is attached directly to the main body, a cost-intensive steel backing is further avoided in the second friction lining. Thus, the efficiency of the clutch disc increases. Due to the prevailing, usually lower temperatures on the second friction lining, no steel backing is required on this, in order to withstand the load. Thus, in this embodiment, no or only an imperceptible strength decreases can be registered. If the first friction lining is mounted on the side of the main part, where higher temperatures are to be expected, namely with regard to the other side of the main part, synergy effects arise from the arrangement of the individual components. Thus, the first friction lining preferably has a steel backing, which is thus used on the side on which higher temperatures are to be expected. In this case, it applies that the higher temperatures refer to the normal state in the stationary operation of a clutch in which the clutch disc is used. The reduction in the mass of the clutch disc has a positive effect on the efficiency of the clutch because the steel back on the second friction lining is missing and the second friction lining on the cold side of the main part is arranged on the other side.

Also part of the invention is a dual clutch in which a clutch disc, as disclosed above, is used. Such a clutch meets high strength requirements and is economically manufacturable. Furthermore, it has an optimized space and a low weight in the axial direction. Likewise part of the invention are dry running double clutches, especially in multi-disc design.

Characteristic of an advantageous embodiment, more than one clutch disc is used in at least one partial clutch of the double clutch, wherein between two clutch plates, a preferably metallic intermediate plate is used and provided with the steel backing friction lining for Inkontakt- arrive with this washer designed and arranged. It is true that in the arrangement of a plurality of clutch discs a plurality of friction linings are arranged. So it is possible that more than one friction lining has a steel backing. According to the invention, at least one of the friction linings is designed for contact with the intermediate disc. This results in a substantially flat frictional connection between the clutch disc and the intermediate plate, whereby the dual clutch is able to reliably transmit high torques.

In a further advantageous embodiment, both partial clutches have one or more intermediate discs and each partial clutch employs at least one clutch disc according to the invention. In this way, the advantages of the clutch disc in terms of space and weight as well as in terms of strength and cost to the entire clutch potentiate.

Once all the clutch discs used in the dual clutch are executed according to the above-described embodiment, additional advantages in logistical handling, since all the clutch discs in the same manufacturing process and preferably even in a single production step can be produced. This continues to increase profitability.

It is also advantageous if the main part is provided with identical properties in the axial direction. This allows a certain axial length to be genausgleich the main part is feasible. Furthermore, the main part is also used for energy absorption in this way. Thus, a thermal input is mitigated to other components, which prevents overheating of the coupling. Clutch discs for dry double clutches depend on the operation to have high bursting speeds, especially after thermal stress. For this purpose, on the one hand, coverings with glued-on steel backing and, on the other hand, special coverings in sandwich winding designs have been developed. In the prior art, the linings of a clutch disc with respect to the bursting strength are made equal. Thus, for example, both pads have a steel backing or both documents are designed in Sandwichwickelbauweise.

According to the invention, in the case of dry multi-plate clutches or even in the case of multi-disk clutches, it is now possible for the significant temperature differences, which act on the different documents, to be incorporated into the constructive

Concept of the clutch disc are integrated. It is true that bursting speeds depend strongly on a thermal load / damage. As a solution is proposed in the context of this application, each to use a cheaper coiled on the operating side in the cold Anpressplattenseite and to use a glued topping on the hotter intermediate plate side.

In other words, it can be said that the object of this invention is to realize a required bursting speed at the lowest possible cost. Friction linings are used according to the invention without sheet metal support at the point at which there are lower thermal loads.

As is known, owing to the design with an intermediate pressure plate in the case of a multi-plate double clutch, an unfavorable temperature distribution results between the individual pressure plates, which, for example, adversely affect the bursting behavior. In order to achieve an optimal relationship between cost and life, the present invention is directed to the fact that friction linings with different backs on the different sides of the Friction discs are used. In this case, it is preferably the case that lining systems can be adapted to the locally arising temperatures.

In this way, on the side of the friction disk, on which higher temperatures are to be expected, lining systems are used which withstand higher temperatures. For example, such flooring systems on one side glued metal sheets, such as mass pressed or wound, with steel backing and on the other hand simple wound coverings. It is also possible that the same coverings are used on both sides, the steel backing being provided on one side only. The background to this is that coverings without glued-on steel backing lose their mechanical strength much faster, while the thermal load remains high. Due to the high thermal load, the binding matrix of organically bonded friction linings is weakened. Accordingly, the steel backing is able to significantly increase the temperature range in which a clutch disc can be used and the mechanical strength.

The invention disclosed herein can be used in all friction clutches in which different temperature developments are to be expected on different sides of a main part. In addition, it should be noted that in the multi-plate clutch, the higher temperature side is always the side facing the intermediate pressure plate.

The invention will be explained in more detail by means of figures. Show it:

1 shows a longitudinal section through a double clutch with a plurality of clutch disks according to the invention;

2a shows a first friction lining according to the invention in a first view;

FIG. 2b shows the friction lining from FIG. 2a in a further view; FIG.

Fig. 2c, the friction lining of FIGS. 2a and 2b in another view; 3a shows a further friction lining in a first view; and FIG. 3b shows the friction lining from FIG. 3a in a further view.

The figures are merely schematic in nature and are for the sole purpose of understanding the invention. The individual features of the individual embodiments can be interchanged. The same features are provided with the same reference numerals.

Fig. 1 shows a built-in clutch disc 1 with a main part 2, which is provided for torque transmission to a shaft 3. For passing on torque, a first friction lining 4 is arranged on one side of the main part 2 and a second friction lining 5 is arranged on a further side of the main part 2. The first friction lining 4 is in this case arranged on a first end face 6 of the main part 2, while the second friction lining 5 is arranged on a second end face 7.

The first friction lining 4 has on one side a steel back 8, which is shown in more detail in particular in Figures 2a to 2c.

The view in Fig. 1 discloses a dual clutch 9, which is composed of a first part clutch 10 and a second part clutch 1 1. In order to increase the possible transmission of the double clutch 9, an intermediate disc 12 is further arranged between the individual clutch discs 1. It is thus a multi-plate dual clutch.

By applying a double rubbing energy to the intermediate pressure plates 12 in multi-plate double clutches 12, a high temperature is formed on the surfaces of the intermediate plate 12, as compared with other surfaces within the clutch. The part of the clutch disc 1, which faces the intermediate disc 12, ie the first end face 6, thus always has a higher temperature than the second end face 7 of the main part 2. On this Way is arranged on just that side of the main part of the first end face 6 of the first friction lining 4, which is strengthened by means of a steel back 8.

The main part 2 of the clutch disc 1 may have an offset part 13, which allows the multi-disc design efficiently. Thus, per shaft connection part 14, the arrangement of a total of four friction linings 4, 5 possible. On the intermediate disc 12 side facing each of the first friction linings 4 are arranged, on the other sides of the second friction linings 5 are arranged. These are exposed to a lower thermal load than the first friction pads 4, which is why they have no steel backing 8.

Fig. 2a shows a first friction lining 4 in a perspective view. Here, the steel backing 8 is recognizable. The friction side 4 shown here is configured with organically bonded friction material 15. This is suitable for the adhesion between the washer 12 and the main part 2. The friction lining 4 has various perforations 16. These act on the one hand to save weight, on the other hand, they are designed to allow thermal removal, ie cooling, of the friction lining 4. The geometric configuration of the perforations 16 is not limited to the present embodiment. Rather, all perforations may be arranged which are suitable for the properties of friction lining 4 prevailing during operation.

Fig. 2b shows the back of the friction lining 4 of Fig. 2a. Here, the steel backing 8 is completely visible. The steel backing 8 has a thickness in the range between see 0.1 mm and 1 mm. Preferably, it is between 0.4mm and 0.5mm thick. Thickness here is the extension of the steel back 8 viewed in the axial direction.

Fig. 2c illustrates the friction lining 4 in a partial section. Thus, the steel backing 8 is also visible from the front. It can be seen here that the perforations 16 of the steel back 8 do not exactly correspond in their shape to that of the friction material 15. This is due to the fact that the perforations 16 are preferably introduced into the material before the steel spine 8 and the friction material 15 connected to each other. Preferably, as mentioned above, the steel spine 8 and the friction material 15 are glued together.

FIG. 3 a shows the second friction lining 5. This has no steel spine 8. Since there is a significantly lower thermal input, the perforations 17 of the second friction lining 5 are smaller in number and size than the perforations 16 of the first friction lining 4. The friction material 15 is preferably made of the same material as in the first friction lining 5 Friction lining 4.

Fig. 3b illustrates the second friction lining 5 in the view, as it faces the main part 2. Here, a smooth surface is arranged to provide a space-optimized solution. The perforations 17, as well as the perforations 16, can be variably designed and adapted to the respective field of application.

Coupling plate

Bulk

wave

First friction lining

Second friction lining

First front page

Second front side

steel backing

Double coupling

First part clutch

Second partial clutch

intermediate plate

offset part

Shaft connection part

friction material

perforation

perforations

Claims

claims

1 . Clutch disc (1) for a friction clutch for use in a drive train of a motor vehicle, having a main part (2) which is designed to transmit torque to a shaft (3) and to support friction linings (4, 5), both front sides (6, 7) of the main part (2) in each case a friction lining (4, 5) is mounted and the two friction linings (4, 5) differ in construction from each other, characterized in that a first friction lining (4) with a main body ( 2) facing steel back (8) is provided, which is a second friction lining (5) which on the first friction lining (4) facing away from the end face of the main part (2) is missing.

Clutch disc (1) according to claim 1, characterized in that the first friction lining (4) wound or pressed is carried out and / or that it is glued on a steel backing (8) adjusting metal plate.

Clutch disc (1) according to one of claims 1 or 2, characterized in that the steel back (8) acts as a sheet carrier.

Clutch disc (1) according to one of claims 1 to 3, characterized in that the second friction lining (5) is designed to be wound and / or directly attached to the main part (2).

Clutch disc (1) according to one of claims 1 to 4, characterized in that the first friction lining (4) on the side of the main part (2) is mounted on which higher temperatures are expected than on the other side of the main part (2) ,

6. dual clutch (9) in the at least one clutch disc (1) according to claims 1 to 5 is inserted.

7. dual clutch (9) according to claim 6, characterized in that in at least one partial coupling (10, 1 1) a plurality of clutch discs (1) are used, wherein between two clutch plates (1) a metallic intermediate plate (12) is inserted and with the steel back (8) provided first friction lining (4) for contacting with the intermediate disc (12) is designed and arranged.

8. Double clutch (9) according to any one of claims 6 or 7, characterized in that both partial clutches (10, 1 1) have one or more intermediate discs (12) and each partial clutch (10, 1 1) at least one clutch disc (1) to one of claims 1 to 5 begins.

9. dual clutch (9) according to one of claims 6 to 8, characterized in that all the clutch discs (1) are designed according to one of claims 1 to 5.

10. dual clutch (9) according to one of claims 6 to 9, characterized in that the main part (2) is provided with damping properties in the axial direction.