DE102015222191A1 - Wet-running double clutch - Google Patents

Abstract

A wet-running dual clutch comprises a first and a second partial clutch, a plurality of elastic elements for returning the partial clutches and a spring retaining element for supporting the elastic elements of the spring assembly.

Description

The invention relates to a wet-running double clutch. In particular, the invention relates to a double clutch with one or more spring assemblies for returning a partial clutch.

A dual clutch, in particular for use in a drive train, for example of a motor vehicle, comprises a first and a second partial clutch. Each partial clutch comprises friction elements, which are rotatable about a common axis of rotation and which can be pressed axially against one another in order to transmit a torque between the friction elements by means of frictional engagement. If the axial contact pressure on a partial clutch is withdrawn, then its friction elements should as far as possible not rest against one another in order to reduce the transmittable torque as far as possible to zero. For this purpose, one or more elastic elements ("return springs") are provided for returning the partial clutch. A transmission element, which transmits the axial contact force to the friction elements, can be lifted by the return spring by a small amount of the friction elements, so that a game is created, which can be filled with air, which is why the return spring is also called release spring. Usually, a return spring is designed as a spring assembly comprising a helical compression spring and an upper and a lower pressure disc at the axial ends of the compression spring. A plurality of return springs may be arranged on a circumference about an axis of rotation of the friction elements of a partial clutch.

Usually, each return spring must be individually inserted into the double clutch, which can lead to high production or assembly costs. According to the current state of the art, one assembly step per spring assembly is necessary. The space requirement is relatively high both axially and radially. The support of the retaining rings against another part of the coupling (for example a drive plate or a pressure pot) is unfavorable for the axial space requirement, and (especially if the spring assemblies are arranged radially) the radial space requirement is determined by the retaining rings and is therefore also unfavorable.

The invention is therefore based on the object to provide an improved double clutch, in which a simplified installation of the return spring is possible. The invention solves this problem by means of a double clutch with the features of the independent claim. Subclaims give preferred embodiments again.

A wet-running dual clutch comprises a first and a second partial clutch, a plurality of elastic elements for returning the partial clutches and a spring retaining element for supporting the elastic elements of the spring assembly.

The spring holding element allows the centering, support and support of one or more elastic elements. At the same time, the spring-holding element can also perform one or more additional functions in the dual clutch, for example, by passing a stream of oil in the dual clutch or by serving as a drive plate to forward the engine torque in the dual clutch. The combination of several functions in one component makes it possible to reduce the space requirement. In addition, the invention allows various possibilities as regards the arrangement of the elastic elements, whereby the space requirement in the radial direction can be further limited.

The invention is particularly suitable for all vehicles with dual-clutch transmission. The invention enables the centering and support of one or more spring packs, and at the same time can also fulfill one or more other functions, e.g. to conduct the oil in the clutch.

The elastic elements are preferably designed as twisted torsion springs, in particular as compression springs. Usually, a spring pact is provided for each partial clutch, which comprises a plurality of elastic elements which are arranged axially between two common holding elements. In particular, the elastic elements can be arranged on a circumference, wherein different sized circumferences can be used with the same centers for the two partial couplings, so that the elastic elements lie on two concentric circles. The holding elements are usually designed annular, with a total of four retaining rings are required in conventional constructions. By the spring retaining element, a retaining ring per spring pack can be saved and thereby also the space requirement (both in the axial and in the radial direction) is lower.

The integration of the functions mentioned in one component makes it possible to reduce the number of components in the clutch, which simplifies the dual clutch, which can reduce assembly steps or limit the space requirement. The spring retaining element can be installed both in an axial and in a radial double clutch. As for the operation of the double clutch, a CSCbetätigte as well as a hydraulically operated double clutch is possible.

The proposed solution comprises a one-piece spring-holding element, which can preferably also be made of plastic or of another material. By on the circumference Distributed material characteristics should allow the spring holding element centering and holding springs of one or more spring assemblies. The characteristics can also be arranged offset, so that overlap the individual spring assemblies in the radial direction, which can lead to an additional space savings. In this case, the shape of the opposing retaining rings would preferably be adapted accordingly, so that the retaining rings do not overlap or interfere with each other in operation.

It is preferred that the spring holding element has a positive reception for each elastic element. This allows the elastic elements to be held securely without additional components.

In this case, the elastic element may comprise a spiral spring and the receptacle may have a cylinder jacket surface for engagement on a radially inner or outer side of the elastic element. Thereby, an annular abutment can be created to hold the elastic element in any radial directions. It is also possible for both embodiments to be combined with one another so that an axial end section of the elastic element is supported both radially inward and radially outward by means of a section of the spring retaining element which has the shape of a cylinder jacket surface.

It is particularly preferred that the spring retaining element is adapted to support first elastic elements associated with the first sub-coupling and second elastic elements associated with the second sub-coupling. All necessary for the provision of a partial clutch of the double clutch elastic elements can rest on one side on the spring retaining element. A space requirement of the double clutch can be reduced. A mounting of the double clutch can be done in fewer steps. In particular, the elastic elements can be pre-assembled on the spring retaining element and used together during assembly in the double clutch.

The elastic elements may be arranged on two concentric circumferences such that inner and outer elastic elements partially overlap in the radial direction. An available space can be exploited thereby improved. In particular, a radial space of the double clutch can be reduced thereby.

The spring element may have a conical shape in a region radially inside the elastic elements. A stability of the spring retaining element can thereby be improved. In addition, an axial support of the spring holding member may be facilitated on another element of the double clutch. In addition, the conical surface may be adapted to carry a stream of liquid, in particular oil, in the region of the double clutch. For this purpose, the spring holding element may comprise one or more openings for the passage of the liquid. At least one of the openings may be in the region of the conical section. Preferably, an opening is radially symmetrical at a narrow end of the conical shape.

The spring-holding element may further be configured to forward a torque from a drive side of the dual clutch. For this purpose, the spring holding element can be arranged in particular to intervene positively in another component. For example, the spring holding element radially on the inside or radially outside corresponding radial projections or a corresponding toothing. As a result, additional functions can be combined in the spring-holding element.

It is further preferred that the spring retaining element can be produced from a plastic. The spring-holding element can thereby be advantageously carried out easily. In addition, production costs can be saved by using plastic. In another embodiment, the spring retaining element can be produced from a different material, in particular steel, preferably in the form of a steel sheet.

The invention will now be described in more detail with reference to the attached figures, in which:

1 a schematic representation of a double clutch;

2 two integrated spring packages for the double clutch of 1 ;

3 different views of a spring-holding element for the double clutch of 1 ; and

4 axial views of the spring retaining element of 3 in a further embodiment
represents.

1 shows a schematic representation of a dual clutch 100 , Around a rotation axis 105 are a first partial clutch 110 and a second part clutch 115 rotatably mounted. In an exemplary way, the partial clutch 110 . 115 arranged radially offset; In another embodiment, an axially offset arrangement may be selected. An entry page 120 the double clutch 100 is preferably set up with a drive motor 125 to be connected. The entrance page 120 will be on both partial clutches 110 . 115 , which independently of each other a frictional connection to a first output side 130 or a second output side 135 can produce. This includes the first part clutch 110 first friction elements 140 around the rotation axis 105 are rotatably arranged. Of two axially adjacent first friction elements 140 is a torque-locked to the input side 120 and the other with the first output side 130 connected torque-tight and axially displaceable. Be the first two friction elements 140 pressed axially against each other, so creates a frictional engagement between the input side 120 and the first exit page 130 , In a corresponding manner, the second part clutch comprises 115 second friction elements 145 to a frictional engagement between the input side 120 and the second output side 135 to allow if the second friction elements 145 be compressed axially.

For actuating the first partial clutch 110 , So for the axial compression of the first friction elements 140 , is a first actuating device 150 intended. A second actuator 155 acts in a corresponding manner on the second friction elements 145 the second partial coupling 115 , A power transmission between the actuators 150 . 155 takes place in each case by means of a print head 175 ,

To the pressure pots 175 push back and thereby a partial clutch 110 . 115 To reset or to be able to ventilate become elastic elements 160 used, for example in the form of a compression spring package 170 , as in 1 is shown. In a usual construction, the elastic elements become 160 every spring package 170 each by means of an associated retaining ring 180 Centered and supported, so a total of four retaining rings 180 required are.

The operating devices 150 . 155 facing retaining ring 180 is in known double clutches often part of the spring package 170 , and also ensures that the power from each pressure pot 175 is forwarded to the elastic elements 160 to compress. To the spring packages 170 each to operate independently of each other is usually on each axial side of each spring assembly 170 provided a holding element.

It is proposed a spring retaining element 185 provide on which all elastic elements 160 the spring packs 170 both partial clutches 110 . 115 abut axially on one side. It is preferred that on the spring retaining element 185 positive receptacles for supporting and / or centering of the elastic elements 160 are provided as below with particular reference to 2 will be described in more detail. The spring retaining element 185 So can two of the above described retaining rings 180 integrate or replace.

The spring retaining element 185 is supported axially on one part 190 the double clutch 100 from. In addition, further geometry on the spring retaining element 185 be attached so that it can fulfill other functions. In the following variant, for example, serves the inner part of the spring retaining element 185 to do a stream of oil in the double clutch 100 to lead. The geometry of the part 190 could, for example, in the spring retaining element 185 be integrated, which would allow to save another component.

2 shows two integrated spring packages 170 for the double clutch 100 from 1 , A number of elastic elements 160 , the first part clutch 110 are assigned are on a perimeter around the axis of rotation 105 arranged and lie on one axial side on the spring holding element 185 and at the other on a retaining ring 180 at. Other elastic elements 160 , the second part clutch 115 are assigned, are in a corresponding manner on a smaller circumference about the axis of rotation 105 arranged and are axially between the spring retaining element 185 and an associated retaining ring 180 , The spring retaining element 185 forms together with the radially outer elastic elements 160 and the radially outer retaining ring 180 a first spring package 170 , the first partial clutch 110 is assigned, and together with the radially inner elastic member 160 and the radially inner retaining ring 180 a second spring package 170 , the second part clutch 115 assigned.

It is preferred that on the spring retaining element 185 for every elastic element 160 a recording 205 is provided to the elastic element 160 to fix. Corresponding pictures 205 can also on the retaining rings 180 be formed. The pictures 205 preferably each comprise a cylinder jacket surface radially inward or radially outward in an axial end portion of an elastic member 160 intervenes. In the illustrated embodiment are both on the part of the spring retaining element 185 as well as on the part of the retaining rings 180 each provided radially inwardly engaging cylinder jacket surfaces. However, other form-fitting contact elements are also possible. The pictures 205 are preferably realized as material characteristics. The spring retaining element 185 For example, be made of a sheet metal, the recordings 205 For example, by means of a thermoforming or embossing process can be formed. In another embodiment, the spring retaining element 185 designed as a plastic part, with the shots 205 directly together with the remaining shape of the spring retaining element 185 can be realized, for example by injection molding. The same variation possibilities are preferably also for the realization of the retaining rings 180 ,

In the illustrated preferred embodiment, the spring retaining element comprises 185 in a radially inner region, a cone-shaped portion 210 , The section 210 extends on a radial inner side of the radially inner elastic elements 160 preferably in the same direction as the elastic elements 160 , In the illustrated embodiment, the axial extent of the section 210 but larger than the elastic elements 160 , At a narrow end, the cone-shaped section 210 have a radially inwardly directed edge. Here is the cone-shaped section 210 open on both sides. In another embodiment, the cone-shaped portion 210 be executed closed on its narrow side.

3 shows different views of the spring retaining element 185 for the double clutch 100 from 1 ,

4 shows axial views of the spring retaining element 185 from 3 in a further embodiment. In the left half of the illustration is an embodiment like that of 2 shown, in each case an outer receptacle 205 and an inner shot 205 to the same radius with respect to the axis of rotation 105 lie. In the right half of 4 another embodiment is shown in which the recordings 205 offset in the circumferential direction and are moved radially so close to each other that inner and outer shots 205 partially overlap radially. As a result, a radially required space can be reduced. The retaining rings required for this embodiment 180 However, they must be adapted to the overlap and shaped so that they do not hinder each other in operation.

LIST OF REFERENCE NUMBERS

100

 Double coupling

105

 axis of rotation

110

 first part clutch

115

 second part clutch

120

input side

125

 drive motor

130

 first exit page

135

 second exit side

140

 first friction elements

145

 second friction elements

150

 first actuating device

155

 second actuating device

160

 elastic element

170

 Spring package (A)

175

 Pressure pot (B)

180

 Retaining ring (C)

185

 Spring holding element (D)

190

 Part (E)

205

 admission

210

 cone-shaped section

Claims (10)

Wet-running double clutch ( 100 ), wherein the double clutch ( 100 ) comprises: - a first ( 110 ) and a second partial clutch ( 115 ); - several elastic elements ( 160 ) for resetting the partial clutches ( 110 . 115 ); and a spring retaining element ( 185 ) for supporting the elastic elements ( 160 ) of the spring package. Double coupling ( 100 ) according to claim 1, wherein the spring retaining element ( 185 ) for each elastic element ( 160 ) a positive reception ( 205 ) having. Double coupling ( 100 ) according to claim 2, wherein the elastic element ( 160 ) comprises a coil spring and the receptacle ( 205 ) a cylinder jacket surface for engagement on a radially inner or outer side of the elastic element ( 160 ) having. Double coupling ( 100 ) according to one of the preceding claims, wherein the spring holding element ( 185 ) is adapted to first elastic elements ( 160 ), the first partial clutch ( 110 . 115 ), and second elastic ( 160 ) Elements, the second part coupling ( 110 . 115 ) are supported. Double coupling ( 100 ) according to one of the preceding claims, wherein the elastic elements ( 160 ) are arranged on two concentric circumferences such that inner and outer elastic elements ( 160 ) partially overlap in the radial direction. Double coupling ( 100 ) according to one of the preceding claims, wherein the spring holding element ( 185 ) in one area ( 210 ) radially inside the elastic elements ( 160 ) has a conical shape. Double coupling ( 100 ) according to one of the preceding claims, wherein the spring holding element ( 185 ) is adapted to a flow of oil in the double clutch ( 100 ) respectively. Double coupling ( 100 ) according to one of the preceding claims, wherein the spring holding element ( 185 ) is adapted to a torque from a drive side ( 120 ) of the double clutch ( 100 ) forward. Double coupling ( 100 ) according to one of the preceding claims, wherein the spring holding element ( 185 ) can be produced from a plastic. Double coupling ( 100 ) according to one of the preceding claims, wherein the spring holding element ( 185 ) can be produced from a sheet.

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