WO2015043593A1

WO2015043593A1 - Lever spring mounted on two sides for a push/pull activation using a tie rod

Info

Publication number: WO2015043593A1
Application number: PCT/DE2014/200459
Authority: WO
Inventors: Dominik Weis
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2013-09-26
Filing date: 2014-09-09
Publication date: 2015-04-02
Also published as: DE112014004459A5; CN105518329B; DE112014004459B4; CN105518329A

Abstract

The invention relates to a clutch for a powertrain of a motor vehicle, comprising a clutch disc which can be clamped between a pressure plate and a counter-pressure plate dependent on a position of a lever element, and comprising a push/pull actuator which is connected to the lever element in order to change the position of the lever element. The lever element is held on a pivot bearing of a clutch cover so as to be fixed in the axial direction of the clutch. The invention also relates to a dual clutch in which one or both sub-clutches is/are designed in the manner of a clutch according to the invention.

Description

Two-sided lever spring

for push / pull activation with tie rods

The invention relates to a coupling for a drive train of a motor vehicle, with a clutch disc, which can be clamped between a pressure plate and a counter-pressure plate in response to a position of a lever element, such as a lever spring, with a push / pull actuator, the position change Lever element is connected to the lever element.

A push / pull actuator is one such actuator that can both pull and push on the lever spring. An actuator can also be called an actuator.

Clutches for motor vehicles are already known from the prior art, in particular those which are combined into double clutches. They are used in powertrains of cars, trucks or other commercial vehicles. Usually friction linings are used in the double clutches, so that they act as friction clutches. They can be designed as a dry or wet coupling. You can use friction linings and lamellae.

In particular, the invention relates to a dual clutch in the drive train of a motor vehicle with two friction clutches, with two each against a friction surface of a rotatably connected to the crankshaft of an internal combustion engine clutch body. Such double clutches are already known from the prior art, for example from DE 10 2005 037 514 A1 and DE 100 13 576 A1.

From DE 10 2005 037 514 A1 namely a double clutch is known in which the coupling body has a housing connected to an intermediate pressure plate with arranged on each side friction surfaces, against the interposition of friction linings each rotatably connected to a transmission input shaft of a dual clutch transmission clutch disc a pressure plate is axially clamped. The pressure plate is rotatably connected to the housing and is acted upon by in each case a transmission side arranged actuating system, which acts on a axially supported on the housing supporting lever spring tongue tongues. Here, the arranged on the transmission side pressure plate pressed by means of the lever spring designed as a lever spring and the pressure plate arranged on the motor side pulled by means of the two-armed lever lever spring formed radially on the outside by means of an intermediate pressure plate cross-tie rod.

DE 100 13 576 A1 discloses a double clutch in which the two pressure plates are actuated by a single actuating system. Here, one of the two pressure plates is braced against an axially fixed friction surface with the interposition of the friction linings of a first clutch disc. The Gegenreibfläche is formed by an axially limited displaceable intermediate pressure plate having on the other side a friction surface against the interposition of the friction linings a second clutch disc one of, actuated by the single actuation system and on the housing against the action of other disc springs supporting disc spring is strained. By this arrangement, the formed friction clutches of the double clutch are serially actuated, that is, as the actuating travel of the actuating mechanism of the actuating system increases, first one and then the other friction clutch are closed. An overlapping operation of the friction clutches, in which one friction clutch is first opened and the other closed, and when it is actuated, it is closed and the other is opened, is not possible with this wiring.

From an older but not yet published patent application, a double clutch in the drive train of a motor vehicle is known. It includes two friction clutches with two each against a friction surface of a non-rotatably connected to the crankshaft of an internal combustion engine clutch body by means of an actuating system axially with the interposition of friction linings each with a transmission input shaft of a dual clutch transmission rotatably connected clutch disc braced and rotatably received on the coupling body pressure plates. In this case, it is especially emphasized that both pressure plates are arranged displaceably by means of a single actuating system along an actuation path one after the other and with respect to a distance from the friction surfaces assigned to them fixed axially relative to the coupling body.

So far, lever elements must be designed very solid and strong so that they can transmit sufficiently large forces, especially in a case in which they additional forces To apply to a clutch disc, so press the clutch disc tighter than usual. Also disadvantages in the use of space are known.

It is the object of the present invention to eliminate these disadvantages.

This object is achieved in a generic coupling according to the invention that the lever member is held immovably in the axial direction of the clutch to a pivot bearing of a clutch cover. The clutch cover is axially fixed in the clutch and can also be referred to in short form as a lid.

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

It is advantageous if the lever element rests in the region of the pivot bearing on its first side on a coupling plate remote side of the clutch cover, such as a projection, a form or a bead, and on another side, namely its first side facing away from the second side of a coupling cover fixed, preferably integral holding portion is position determined. The contact can also be present there indirectly on a form, a bead, a (re) curling or a fold, for example, with the interposition of an intermediate element, such as a wire ring. The lever spring is then mounted on two sides or is supported on both sides. On the one hand, the lever spring is supported directly on the clutch cover, on the other side, for example, on the wire ring. The wire ring is held by forms of the lid in position, preferably centered.

It is advantageous if the lever element rests in the region of the pivot bearing on its second side on the holding portion or a wire ring contacting the holding portion. The wire ring then acts as a cost-effective spacer element, wherein it is also possible in principle that the holding portion of the clutch cover is directly in contact with the second side of the lever element.

It is advantageous if the lever element with a tie rod, which is designed for applying force to the clutch disc, is in operative relationship. An over and / or encompassing of intermediate elements is then easily enabled, and facilitates future use in dual clutches.

It has proved to be expedient if a remote from the push / pull actuator end of the lever spring contacted the tie rod. Largest forces can then be transferred.

It is advantageous if the lever element is designed as a lever spring, in particular as snap spring. Namely, particularly preferred is the use of a lever spring with snap characteristic, since the force of the lever spring in the disengaged state can be reduced to zero here with a corresponding design.

To minimize the forces, the use of a lever spring for actuating the tie rod is proposed, which is biased in its installed position so that the (partial) coupling, such as a K1 or a K2, is closed, ie "normally closed" By pressing the lever spring, the respective coupling is opened and corresponding leaf springs are provided for releasing / opening the coupling, so that it is advantageous if the coupling is in an installed position biased is that it is closed.

An advantageous embodiment is also characterized in that the lever spring, the push / pull actuator, the pressure plate, the clutch disc and designed as a central plate or counter pressure plate are arranged to each other so that by pressure applied to the lever spring by the push / pull Actuator is increased by the torque transferable by the clutch and by applying the clutch lever to the lever by the push / pull actuator, the clutch is released / opened.

Of course, the invention also relates to a double clutch, in which one or both partial clutches (K1 and / or K2) is / are formed in the manner of a clutch of the type according to the invention.

Although a two-sided supported lever spring is basically known from the older, but not yet published application, but actuated via the tie rod a normally open clutch and otherwise is in interplay with the lever spring for the K2. Here, a completely different concept is proposed. The invention describes the construction of a clutch system, in particular a double clutch, in which at least one pressure plate is actuated by means of a tie rod, in particular "pressed" onto the clutch disc, thus exerting an additional additional force.

You could also say that the lever spring is mounted on both sides and is installed so that the part clutch is closed in its installed position (EBL).

Due to the way in which the lever spring is installed, this results in a "normally closed" coupling, which means that the clutch disc is clamped between the central plate and the pressure plate via the tie rod Direction of the clutch disc or the pressure plate, that is, the pressure plate, too moved, the contact pressure is additionally strengthened, resulting in an increased moment.

Through the wire ring, which is clamped between the clutch cover / lid and the lever spring, results in a two-sided support. Now, if the lever spring in the direction away from the pressure plate, that is the pressure plate and clutch plate facing away, actuated, ergo pulled, the lever spring is supported on the wire ring and the partial clutch can be released by the restoring force of the leaf springs between the pressure plate and the central plate ,

If the lever spring is designed as a snap spring so that the lever spring engages in the released state, the holding force of the engagement system in the opened state is reduced to zero Newton (0 N) since the lever spring remains in this position until it is snapped over again.

The possibility of push / pull actuators, which act on the partial clutch (about K1), such as using a tie rod, the engagement forces can be reduced at the same moment. Thus, the components for less stress, ergo less massive and / or stable - so lighter - to be interpreted.

It has proven to be advantageous if touch points of the friction clutches are matched to one another, so that they coincide in a narrow interval of the actuation path. This can be done by at least one of the friction clutches, preferably both have a self-adjusting adjusting device. Such an adjusting device can compensate, for example, depending on a occurring during lining wear of the friction linings reusable the actuating travel or a higher actuation force the forming distance between the coupling body associated friction surfaces and the friction surfaces of the respective pressure plates. Such adjusting devices are known for example from DE 10 2009 014 001 A1. The features disclosed there with respect to the adjustment should be considered integrated here.

The invention will be explained in more detail with the aid of a drawing. Here, a first embodiment is further explained. Show it:

1 shows a detail through a first embodiment of a coupling according to the invention when showing the installation position in a longitudinal section with only partially shown components,

Fig. 2 shows a further cross section through the coupling of FIG. 1 in the installed position of

Lever member,

3, the coupling of FIG. 1, but in the open, that is moved in the direction II position,

Fig. 4 is a graphical representation of Einrückkraftverlaufs and the transmitted

Torque depending on the lever element moved lever, using a normal spring, and

Fig. 5, the Einrückkraft- and torque curve using a snap spring as

Lever member.

The figures are merely schematic in nature and are only for the understanding of

Invention. The same elements are given the same reference numerals.

In Fig. 1, a first embodiment of a coupling 1 according to the invention is shown. It is used in a drive train of a motor vehicle, namely a car or a truck. It has a clutch disc 2. The clutch disc 2 is provided with friction linings 3. It is between a pressure plate 4 and a counter-pressure plate 5 in the in Fig. 1st dargstellten state, namely the mounting position (EBL), held frictionally, ie clamped. The pressure plate 4 is formed as a pressure plate 6. The counter-pressure plate 5 is formed as a central plate 7.

A tie rod 8 is screwed to the pressure plate 6. A first end 9 of a lever element 10, namely a lever spring 1 1 presses on an edge 12 of the tie rod 8 upon appropriate actuation of the lever member 10. At the second end of the lever member 10, which is marked with the reference numeral 13, engages an actuator 14, namely a Part of a push / pull actuator 15 on. The push / pull actuator 15 is part of a push / pull-capable engagement system.

The second end 13 of the lever element 10 is movable in direction I and in the direction II from the installation position (EBL). Upon movement of the radially inner end of the lever element 10 in the direction I, the clutch disc is "over-pressed", ie an additional additional clamping force is applied.

Between the first end 9 and the second end 13 of the lever member 10, a pivot bearing 16 is formed for the lever spring 1 1, about which the lever spring 1 1 can tilt / pivot. The lever element 10 has a first side 17 and a second side 18. The first side 17 points to a cover / clutch cover 19. The cover / clutch cover 19 is arranged axially fixed in the coupling 1.

The lid 19 also has a holding portion 20.

The first side 17 of the lever member 10 abuts a bulge 21 of the lid / clutch cover 19, whereas the second side 18 rests against the holding portion 20 with the interposition of a wire ring 22. On one side of the pivot bearing 16 thus the bulge 21 and on the other side of the wire ring 22 is arranged. This can also be seen in Fig. 2, in which a further section is shown in a different sectional plane.

The released situation of the clutch 1 is shown in Fig. 3, in which a gap 23 between the central plate 7 and the clutch disc 2 is established. In Figs. 4 and 5, line 24 represents the torque curve of the spring as a function of a distance s on the abscissa. The force curve, ie the ratio of engagement force to path s, is indicated by the line 25. When using a snap spring as a lever spring 1 1, as in Fig. 5 basis, show two zero crossings in the force curve 25th

LIST OF REFERENCES

clutch

clutch disc

friction lining

printing plate

Platen

pressure plate

Central plate

tie rods

First end of a lever element

lever member

lever spring

edge

Second end of the lever element

actuator

Push / pull actuator

pivot bearing

First side of the lever element

Second side of the lever element

Cover / clutch cover

holding section

bulge

wire ring

gap

Torque curve / torque curve

force curve

Claims

claims

1 . Coupling (1) for a drive train of a motor vehicle, with a clutch disc (2) which can be clamped between a pressure plate (4) and a counter-pressure plate (5) in dependence on a position of a lever element (10), with a push / pull actuator (15,) connected to the position change of the lever element (10) with the lever element (10), characterized in that the lever element (10) in the axial direction of the clutch (1) immovably held on a pivot bearing (16) of a clutch cover (19) is.

2. clutch (1) according to claim 1, characterized in that the lever element (10) in the region of the pivot bearing (16) on its first side (17) on a clutch disc remote side of the clutch cover (19) rests and on its first side ( 17) facing away from the second side (18) of a clutch cover fixed holding portion (20) is positionally determined.

3. clutch (1) according to claim 2, characterized in that the lever element (10) in the region of the pivot bearing (16) on its second side (18) on the holding portion (20) or a holding portion (20) contacting wire ring (22) is applied.

4. clutch (1) according to one of claims 1 to 3, characterized in that the lever element (10) with a tie rod (8), which is designed for applying force to the clutch disc (2), is in operative relationship.

5. Coupling (1) according to claim 4, characterized in that one of the push / pull actuator (15) remote end (9) of the lever element (10) contacts the tie rod (8).

6. clutch (1) according to one of claims 1 to 5, characterized in that the lever element (10) as a lever spring (1 1) is formed.

7. clutch (1) according to claim 6, characterized in that the lever spring (1 1) is equipped as a snap spring.

8. clutch (1) according to one of claims 1 to 7, characterized in that the coupling (1) in an installed position (EBL) is biased so that it is closed (normally closed).

9. clutch (1) according to one of claims 1 to 8, characterized in that the lever spring (1 1), the push / pull actuator (15), the pressure plate (4), the clutch disc (2) and as Central plate (7) formable counter-pressure plate (5) are arranged to each other, that by pressure applied to the lever spring (1 1) by the push / pull actuator (15) by the coupling (1) transferable torque is increased and by Zugaufbringen the Clutch (1) is released / opened.

10. Double clutch, in which one or both partial clutches (K1 and / or K2) in the manner of a clutch (1) of claims 1 to 9 is / are formed.