DE102019118347B3 - Pressure pot for operating a friction clutch - Google Patents

Abstract

A pressure pot (16) is provided for actuating a friction clutch (12, 14) with a force introduction element (22) for introducing an actuating force generated by an actuation system in an axial direction, a pressure element (30) for striking a pressure plate (32) of the Friction clutch (12, 14) and a return spring (18) for displacing the pressure element (30) in an initial position remote from the pressure plate (32), the return spring (18) being integral with the force application element (22) and with the pressure element (30) is designed. The one-piece integration of the return spring (18) in the pressure pot (16) enables the number of components and the assembly effort to be reduced, so that a friction clutch (12, 14) that is inexpensive to manufacture is possible.

Description

The invention relates to a double clutch for coupling a motor shaft of a motor vehicle engine with a first transmission input shaft and / or a second transmission input shaft of a motor vehicle transmission with a first friction clutch for coupling the motor shaft with the first transmission input shaft and / or a second friction clutch for coupling the motor shaft with the second transmission input shaft. The double clutch also has a first pressure pot and a second pressure pot, with the aid of which the first and / or friction clutch can be actuated by an actuation system directly, that is to say without lever transmission.

One in 1 shown previously known double clutch 10 has a first friction clutch 12 and a second friction clutch 14th on, which are each designed as a multi-plate clutch. To operate the respective friction clutch 12 , 14th is in each case a pressure pot that can be axially displaced by an actuation system 16 provided against the spring force of a separate return spring 18th to close the associated friction clutch 12 , 14th can be relocated. The return spring designed as a disc spring 18th is used to provide a restoring force when the corresponding associated friction clutch is closed 12 , 14th between an axially fixed support disc 20th and the pressure pot 18th compressed.

There is a constant need to reduce the manufacturing costs of a friction clutch.

Another prior art is the DE 10 2015 205 832 A1 referenced, which discloses a clutch unit with a first partial clutch and a second partial clutch, wherein an actuating means is provided for the axial actuation of the disk set of the first clutch and an elastic element in the form of a finger is provided to reset the actuating means.

It is the object of the invention to indicate measures which enable a cost-effective double clutch with corresponding friction clutches.

The object is achieved according to the invention by a double clutch with the features of claim 1. Preferred embodiments of the invention are specified in the subclaims and the following description, each of which can represent an aspect of the invention individually or in combination.

According to the invention, a double clutch is provided, with a pressure pot for actuating a friction clutch, with a force introduction element for introducing an actuating force generated by an actuation system in the axial direction, a pressure element for striking a pressure plate of the friction clutch and a return spring for moving the pressure element in one of the Starting position removed from the pressure plate, the return spring being designed in one piece with the force application element and with the pressure element.

As a rule, the pressure pot is to be axially displaced by an actuation system that has a piston that can be extended in the axial direction of the friction clutch without an intermediate lever transmission, so that in particular an actuating force introduced radially inward can be transmitted axially outside via the pressure pot to the pressure plate in order to To close the friction clutch. For this purpose, the force introduction element can be provided radially on the inside, in particular on a radially inner edge area of the pressure pot, and the pressure element can be provided radially on the outside, in particular on a radially outer edge area of the pressure pot. The force introduction element and the pressing element can be connected to one another via a disk-like intermediate area, the shape of which can be freely designed within certain limits. The pressure pot is preferably made of a steel which, apart from a slight elastic deformation under the loading of the applied actuating force, is essentially rigid when manufactured at low cost. It was recognized that an annular intermediate area that is completely closed in the circumferential direction is not required at all for the transmission of force between the force introduction element and the pressure element, so that it is possible to form the return spring by a disk body of the pressure pot that also includes the force introduction element and the pressure element. In addition, it was recognized that a space-saving return spring does not necessarily have to be formed by a plate spring, but can also be provided by an elastically deformable tab that can be bent out of the surrounding material of the disc body of the pressure pot. In particular, if the pressure pot has a thicker material than a typical disc spring so that it can only be elastically deformed to a negligible extent with an expected maximum actuation force, the one-piece return spring in the form of a protruding tab can easily have a suitable spring characteristic The spring characteristic can correspond sufficiently strongly to a spring characteristic of an otherwise provided separate disc spring. Due to the one-piece integration the return spring in the pressure pot, the number of components and the assembly effort can be reduced, so that a friction clutch that is inexpensive to manufacture is possible.

In particular, the return spring is designed as a leaf spring. The return spring can be designed as a tab with the material thickness of the rest of the pressure pot. One flat side of the restoring spring can rest and / or strike a component of the friction clutch that is immovable in the axial direction and can be bent elastically to a significant extent in the direction of its surface normal. The return spring designed as a single-leaf leaf spring can be stressed in the manner of a bending beam so that local stress peaks are avoided and a change in the spring characteristic of the return spring due to parts of plastic deformation can be avoided. A longitudinal direction of the restoring spring can run at least partially in the radial direction and / or in the tangential direction, so that given structural space conditions can be dealt with particularly easily.

The return spring is preferably made from a disk body which can be produced by punching and reshaping. The disk body forming the pressure pot can be manufactured inexpensively from sheet metal by punching the disk body out of the metal sheet and reshaping it to its final shape by non-cutting, plastic forming, in particular forging, deep drawing, bending. Here, the return spring, in particular designed as a tab-shaped leaf spring, can be partially separated from the surrounding material of the disk body by a separating gap during the punching step and bent out of the plane surrounding the return spring by plastic deformation in the forming step. As a result, the return spring is made sufficiently strong from the previously surrounded material to take over the spring function.

A plurality of return springs are particularly preferably provided distributed in the circumferential direction. This enabled a more uniform force support of the spring forces acting on the return springs, so that stress peaks in the respective return spring can be avoided and / or kept low. In particular, at least three return springs are provided so that a three-point mounting can be achieved via the return springs.

The invention also relates to a friction clutch for coupling a motor shaft of a motor vehicle engine to a transmission input shaft of a motor vehicle transmission, with a counter plate for introducing a torque coming from the motor shaft, a pressure plate axially displaceable relative to the counter plate for frictional pressing of at least one friction lining that can be coupled to the transmission input shaft between the Counter plate and the pressure plate and a pressure pot, which can be designed and developed as described above, for pressing the pressure plate onto the counter plate when an actuating force is introduced and for automatically canceling a pressure between the pressure plate and counter plate when there is no actuating force. The one-piece integration of the return spring in the pressure pot enables the number of components and the assembly effort to be reduced, so that a friction clutch that can be produced inexpensively is made possible.

In particular, a support disc connected directly or indirectly to the counterplate and immovable in the axial direction, in particular designed as a clutch cover, is provided, the return spring of the pressure pot being supported on the support disc. In particular, the support disk can be provided in the axial direction between the pressure plate and a large part of the pressure pot, the support disk having passages for the fingers having the respective pressure element to pass through, so that the pressure pot can communicate with the pressure plate behind the support disk via the fingers passed through the support disk Can achieve pressing elements. The restoring spring can thereby be pressed against the axial side of the support disk, which faces the majority of the pressure pot, in order to push the pressure pot back into the axial position corresponding to the open position of the friction clutch when there is no longer any operating force. Alternatively, the support disk can be positioned in the axial direction in the manner of a clutch cover in such a way that the pressure pot is arranged in the axial direction between the support disk and the pressure plate. The return spring formed by the pressure pot can in this case be hooked into a protruding hook of the support disc on the side of the pressure pot facing away from the pressure plate, so that the pressure pot can be pushed back by the return spring into the axial position corresponding to the open position of the friction clutch, if there is no longer any actuation force.

The restoring spring is preferably designed to be compressed in the axial direction when the pressure plate is displaced towards the counter plate in order to build up a compressive force. This prevents the return spring from hooking into the support disc, which simplifies assembly.

The invention also relates to a double clutch for coupling an engine shaft of a motor vehicle engine to a first transmission input shaft and / or a second transmission input shaft of a motor vehicle transmission with a first friction clutch, which can be designed and developed as described above, for coupling the motor shaft to the first transmission input shaft and / or a second friction clutch, which can be designed and developed as described above, for coupling the motor shaft to the second transmission input shaft. The one-piece integration of the return spring in the pressure pot of the respective friction clutch allows the number of components and the assembly effort to be reduced, so that a friction clutch that is inexpensive to manufacture is made possible.

It is particularly preferred that the return spring of the pressure pot of the first friction clutch and the return spring of the pressure pot of the second friction clutch are supported directly or indirectly on the same axially immovable component. The number of components is kept low and the assembly effort is reduced. The production costs can thereby be kept low.

In particular, it is provided that the first friction clutch and / or the second friction clutch is / are designed as a multi-plate clutch. As a result, radial installation space can be saved. In addition, the number of friction pairings in the respective multi-plate clutch can easily be used to set a maximum torque to be transmitted for the respective multi-plate clutch. In addition, it is possible to cool the friction clutch with a coolant, in particular oil, wherein a drop in the coefficient of friction caused by the coolant can easily be compensated for by the increased number of friction pairings.

• 1: eine schematische perspektivische Schnittansicht eines Teils einer vorbekannten Doppelkupplung,
• 2: eine schematische perspektivische Schnittansicht eines Teils einer erfindungsgemäßen Doppelkupplung und
• 3: schematische perspektivische Schnittansicht eines Drucktopfes der Doppelkupplung aus 2.

In the following, the invention is explained by way of example with reference to the attached drawings using preferred exemplary embodiments, wherein the features shown below can represent an aspect of the invention both individually and in combination. Show it:

• 1 : a schematic perspective sectional view of part of a previously known double clutch,
• 2 : a schematic perspective sectional view of part of a double clutch according to the invention and
• 3 : schematic perspective sectional view of a pressure pot of the double clutch from 2 .

In the 2 illustrated double clutch according to the invention 10 has a first friction clutch 12 and a second friction clutch 14th on, which are each designed as a multi-plate clutch. To operate the respective friction clutch 12 , 14th is in each case a pressure pot that can be axially displaced by an actuation system 16 provided against the spring force of one of the pressure pot 16 self-trained return spring 18th to close the associated friction clutch 12 , 14th can be relocated. The return spring designed as a bending beam and / or leaf spring 18th is used to provide a restoring force when the corresponding associated friction clutch is closed 12 , 14th between an axially fixed support disc 20th and the pressure pot 18th compressed.

The in 3 pressure pot shown as an example 16 has a force introduction element radially on the inside 22nd on which a, for example, hydraulically extendable piston of an actuation system can initiate an actuation force pointing in the axial direction. The force introduction element 22nd is over an annular disc-shaped but cranked intermediate area 24 of a one-piece disc body 26th with fingers protruding in the axial direction 28 connected, each of which has a pressing element at its protruding end 30th form.

As in 2 shown, the fingers can 28 through openings in the support disc 20th protrude so that the pressure element 30th on a pressure plate 32 the respective associated friction clutch 12 , 14th can attack the friction clutch 12 , 14th close. The pressure plate 32 is formed in the illustrated embodiment by an outer steel plate in the axial direction, which on one, for example, by an outer plate carrier 34 trained, axially fixed counter plate 36 can be pressed to the friction pairings between the alternating with the outer disk carrier 34 and with an inner disc carrier 38 to produce non-rotatable but axially movable slats. Via the respective inner plate carrier 38 can do that in the friction clutch 12 , 14th transmitted torque can be forwarded to a first transmission input shaft or a second transmission input shaft of a dual clutch transmission. The support disc 20th can with the counter plate 36 be non-rotatably connected, the outer disk carrier for this purpose in the illustrated embodiment 34 the friction clutches 12 , 14th into corresponding openings in the support disc 20th can be inserted rotatably. For introducing the torque into the friction clutches 12 , 14th can for example be provided that the support disc 20th with a flywheel connected to an engine shaft of a motor vehicle engine 40 is rotatably coupled.

As in 3 shown is the return spring 18th in one piece from the disc body 26th highlighted and thus also integral with the radially inner force introduction element 22nd and the radially outer pressure element 30th designed. The return spring 18th is for this purpose as a tab-shaped leaf spring made of the material of the intermediate area 24 bent out plastically and can when closing the friction clutch 12 , 14th with the flat side directly or indirectly against the support disc 20th pressed and compressed to build up a spring force. When there is no more operating force in the pressure pot 16 is initiated, the spring force of the return spring 18th the pressure pot 16 in one of the open positions of the friction clutch 12 , 14th Press so that the friction clutch is designed normally open.

List of reference symbols

10

Double coupling

12

first friction clutch

14th

second friction clutch

16

Pressure pot

18th

Return spring

20th

Support disc

22nd

Force introduction element

24

Intermediate area

26th

Disc body

28

Fingers

30th

Pressure element

32

Pressure plate

34

Outer disc carrier

36

Counter plate

38

Inner disc carrier

40

flywheel

Claims (6)

Double clutch for coupling a motor shaft of a motor vehicle engine with a first transmission input shaft and / or a second transmission input shaft of a motor vehicle transmission with a first friction clutch (12) for coupling the motor shaft with the first transmission input shaft, with a first counter plate (36) for introducing a torque coming from the motor shaft, a first pressure plate (32) axially displaceable relative to the first counterplate (36) for frictionally locking at least one friction lining between the first counterplate (36) and the first pressure plate (32) and which can be coupled to the first transmission input shaft a first pressure pot (16), with a first force introduction element (22) for introducing an actuating force directed in the axial direction, generated by an actuation system, a first pressure element (30) for striking the first pressure plate (32) of the first friction clutch (12, 14) and a first return spring (18) for displacing the first pressure element (30) in a starting position remote from the first pressure plate (32), in which the first return spring (18) is designed in one piece with the first force introduction element (22) and with the first pressure element (30), for pressing the first pressure plate (32) onto the first counterplate (36) when an actuating force is introduced and for automatically releasing a pressure between the first pressure plate (32) and first counterplate (36) when there is no actuation force and or a second friction clutch (14) for coupling the motor shaft to the second transmission input shaft, with a second counter plate (36) for introducing a torque coming from the motor shaft, a second pressure plate (32) axially displaceable relative to the second counter-plate (36) for frictionally locking at least one friction lining between the second counter-plate (36) and the second pressure plate (32), which can be coupled to the second transmission input shaft a second pressure pot (16), with a second force introduction element (22) for introducing an actuation force directed in the axial direction, generated by an actuation system, a second pressure element (30) for striking the second pressure plate (32) of the second friction clutch (12, 14) and a second return spring (18) for displacing the second pressure element (30) in a starting position remote from the second pressure plate (32), in which the second return spring (18) is designed in one piece with the second force introduction element (22) and with the second pressure element (30), for pressing the second pressure plate (32) onto the second counterplate (36) when an actuating force is introduced and for automatically releasing a pressure between the second pressure plate (32) and second counterplate (36) when there is no actuation force, one being indirectly or directly with the first counter-plate (36) and the second counter-plate (36) connected and immovable in the axial direction, support disk (20) is provided, the first return spring (18) of the first pressure pot (16) and the second return spring of the second pressure pot directly or support it indirectly on the support disc (20). Double clutch after Claim 1 , characterized in that the first return spring (18) and / or the second return spring (18) is designed as a leaf spring. Double clutch after Claim 1 or 2 characterized in that the first return spring (18) and / or the second return spring (18) is made of a disk body (24) which can be produced by punching and forming. Double clutch according to one of the Claims 1 to 3 characterized in that several return springs (18) are provided distributed in the circumferential direction over the respective first and / or the second pressure pot (16). Double clutch according to one of the preceding claims, characterized in that the first return spring (18) of the first pressure pot (16) and / or the second return spring (18) of the second pressure pot (16) is / are designed when the pressure plate (32) is moved onto the Counter plate (36) to be compressed to build up a compressive force in the axial direction. Double clutch according to one of the preceding claims, characterized in that the first friction clutch (12) and / or the second friction clutch (14) is / are designed as a multi-plate clutch.

Images