DE102017129261A1 - Multi-disc clutch with spring arranged radially inside a disc pack and hybrid module with multi-disc clutch - Google Patents

Abstract

The invention relates to a multi-disc clutch (1) for a drive train of a motor vehicle, comprising an inner disc carrier (2) in which at least one inner disc (3) is secured against rotation but axially displaceable, an outer disc carrier (4) in which at least one outer disc (5 ), but axially displaceable, wherein the inner disks (3) and the outer disks (5) form a disk set (6), and a pressure plate (7), for adjusting the disk clutch (1) by an actuating element (8) opposite the biasing force of a spring (9) is axially displaceable, wherein the spring (9) is arranged radially within the disk pack (6). Furthermore, the invention relates to a hybrid module for a motor vehicle, with a first drive machine, the torque transmitting connectable to a transmission input shaft, and a second drive machine, the torque transmitting via a clutch to an output shaft of the first drive machine is connectable, wherein the separating clutch as such a multi-plate clutch ( 1) is formed.

Description

The invention relates to a multi-plate clutch / multi-plate clutch for a drive train of a motor vehicle, in particular for use as a separating clutch in a (P2) hybrid module, with an inner disk carrier, in which at least one inner disk is secured against rotation, but axially displaceable, an outer disk carrier in which at least an outer disk is secured against rotation, but axially slidably received, the inner disks and the outer disks form a disk set, and a pressure plate which is axially displaceable for adjusting the multi-plate clutch by an actuating element against the biasing force of a spring. Furthermore, the invention relates to a hybrid module for a motor vehicle, with a first drive machine, the torque transmitting connectable to a transmission input shaft, and a second drive machine, the torque transmitting via a clutch to an output shaft of the first drive machine is connectable.

Multi-disc clutches which are used as a separating clutch in a hybrid module are already known from the prior art. For example, the DE 10 2013 214 502 A1 a kit of a separating clutch and an actuating device, such as an electric Zentralausrücker, wherein the separating clutch has a pressure plate which cooperates with a release bearing of the actuator, that an axial displacement of the pressure plate is enforced, the release bearing connected via a rigid connection with the pressure plate is.

Also reveals the WO 2016/070878 A1 a hybrid module for a powertrain of a motor vehicle, the hybrid module comprising: an input side for connection to an internal combustion engine; an output side for connection to a drive wheel; an electric drive motor having a stator and a rotor; a torque transmitting device between the rotor and the output side; wherein the transmission means is adapted to reduce rotational nonuniformity.

In these multi-plate clutches of the prior art, springs, in particular disc springs, are used both in normally-open and normally-closed clutches in order to provide either the contact force of the clutch or to realize a preload. These disc springs are usually designed so that they have approximately the same outer diameter as the disk set of inner disks and outer disks, in order to enable a power-optimized and voltage-optimized design.

With normally-open couplings, the clutch is opened in an unactuated state. The pressure plate is displaced for actuating the clutch in the axial direction, so that the outer disks and inner disks are pressed against a counter-pressure plate for generating a frictional engagement for the frictional force transmission between the inner disk carrier and the outer disk carrier. With normally-closed couplings, the clutch is closed in an unactuated state. The pressure plate is thus pressed by the spring force of the spring against the counter-pressure plate. To open the clutch, the pressure plate is displaced against the contact force / spring force of the spring in the axial direction (away from the counter-pressure plate).

However, the prior art always has the disadvantage that the disc springs commonly used by their large outer diameter require a large radial space, so that the disk set and the plate spring must be arranged in the axial direction one behind the other. As a result, a clutch which is wide in the axial direction is created.

It is therefore the object of the invention to avoid or at least reduce the disadvantages of the prior art. In particular, a multi-plate clutch is to be developed, in which the spring is designed and arranged so that a possible axially narrow-fitting clutch is realized with an increased torque transmission capacity.

The object of the invention is achieved in a generic device according to the invention in that the spring is arranged radially within the disk pack. That is, an outer diameter of the spring is smaller than an inner diameter of the plate pack. So that means that the disk set and the spring are arranged radially one above the other.

This has the advantage that more friction plates can be used by the space-saving arrangement of the spring in a constant axial space. Due to the increased friction surface advantageously the torque transmission capacity / torque capacity of the multi-plate clutch can be increased.

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

It is particularly preferred if the spring for applying a biasing force to the actuating element and / or the pressure plate is designed as a plate spring, since the spring can then be made compact and the spring high Can muster forces. Moreover, it is particularly advantageous in a diaphragm spring that several individual disc springs can be combined almost arbitrarily.

In addition, it is expedient if at least two springs, in particular disc springs, are present, against the biasing force of the pressure plate is displaced in the axial direction. As a result, the spring characteristic of the spring assembly from the at least two springs can be varied. The springs can be advantageously designed more stress-critical.

In particular, it is preferred if the at least two springs are connected in series. This means that the springs are installed as a spring column. As a result, advantageously, a softer spring compared to a single spring can be formed.

It is possible if the springs are arranged in the same direction or alternately stacked or if a combination of the same direction and alternating arrangement is selected. Thus, the spring travel spring force characteristic curve can be adapted particularly well to the present application.

Further, it is advantageous if an axial stop for limiting a Einrückweges / spring travel of the spring is present. This can be prevented in a simple manner at each operating point of the multi-plate clutch that a snap effect such as a "snapping" of the spring on a flat position occurs.

A favorable embodiment is characterized in that a first axial stop for the spring on the inner disk carrier, preferably on an axial, the spring-facing surface of the inner disk carrier, is formed. So it is not necessary to use an additional stop component, since the stop function can be integrated into the inner disc carrier.

Furthermore, it is expedient if a second axial stop for the spring on the actuating element, preferably on an axial, the spring-facing surface of the actuating element is formed. Thus, it is not necessary to use an additional stop member since the stop function is incorporated into the actuator, e.g. in a pressure pot, can be integrated.

Moreover, it is advantageous if the spring is arranged in the axial direction at the height of the disk set or at least one lamella of the inner disk or outer disk. As a result, the required axial space is kept as low as possible in an advantageous manner.

Moreover, it is advantageous if the spring is arranged in the axial direction between the pressure plate and a counter-pressure plate, wherein the counter-pressure plate is designed so that the outer disk and / or the inner disk are pressed when closing the clutch of the pressure plate against the counter-pressure plate. Thus, a particularly compact design-producing multi-plate clutch is provided.

The object according to the invention is also achieved by a hybrid module for a motor vehicle, in particular a P2 hybrid module, having a first drive machine, preferably an electric machine, which is connectable to a transmission input shaft to transmit torque, and a second drive machine, preferably an internal combustion engine, which transmits torque via a separating clutch is connectable to an output shaft of the first drive machine, wherein the separating clutch is designed as a multi-plate clutch according to the invention. In particular, in a multi-plate clutch, which is used as a separating clutch in a hybrid module, it is of great importance to be able to provide a multi-plate clutch with high torque capacity at the same time compact design.

It is also advantageous if the inner disk carrier is coupled to an output shaft of the second drive machine and the outer disk carrier is coupled to the output shaft of the first drive machine. It is also possible if outer disk carrier is coupled to the output shaft of the second drive machine and the inner disk carrier with the output shaft of the first drive machine.

In a preferred embodiment, the first drive machine is arranged axially parallel to the transmission input shaft and / or to the second drive machine.

In other words, the invention relates to a hybrid module for a motor vehicle, wherein the hybrid module has an intermediate shaft for connecting an internal combustion engine, an electric machine and a transmission. The invention solves the problem of reducing the axial installation space and at the same time increase a number of slats or a disk set of a separating clutch, which is designed as a multi-plate clutch / multi-plate clutch. According to one aspect of the invention, in a separating clutch of a hybrid module, at least one disc spring is arranged radially inside the disc pack of the separating clutch, so that the disc pack and the plate spring are arranged one above the other in the radial direction. With In other words, an outer diameter of the plate spring is smaller than an inner diameter of the plate pack. Advantageously, several disc springs can be used, which are preferably connected together in series. The plurality of disc springs are designed so that snapping through of each of the plurality of disc springs is prevented at each operating point.

• 1 eine perspektivische Längsschnittdarstellung einer erfindungsgemäßen Lamellenkupplung mit einer radial innerhalb eines Lamellenpakets angeordneten Tellerfeder, und
• 2 eine perspektivische Längsschnittdarstellung der Lamellenkupplung mit zwei radial innerhalb des Lamellenpakets angeordneten Tellerfedern.

The invention will be explained below with the aid of drawings. Show it:

• 1 a perspective longitudinal sectional view of a multi-plate clutch according to the invention with a radially disposed within a disk set plate spring, and
• 2 a perspective longitudinal sectional view of the multi-plate clutch with two radially arranged inside the disk set plate springs.

The figures are merely schematic in nature and are for the sole purpose of understanding the invention. The same elements are identified by the same reference numerals. The features of the different embodiments can be interchanged.

1 shows a multi-plate clutch / multi-plate clutch according to the invention 1 for a drive train of a motor vehicle, in particular for use as a disconnect clutch in a P2 hybrid module. The multi-plate clutch 1 has an inner disk carrier 2 on, in which several inner fins 3 secured against rotation, but are received axially displaceable. Also has the multi-plate clutch 1 an outer disc carrier 4 on, in which several outer plates 5 secured against rotation, but are received axially displaceable. The inner disks 3 and the outer plates 5 together form a disc pack 6 the multi-plate clutch 1 , The multi-plate clutch 1 also has a pressure plate 7 on, for adjusting the multi-plate clutch 1 is designed. When adjusting the multi-plate clutch 1 becomes the pressure plate 7 by an actuator 8th against the biasing force of a diaphragm spring 9 shifted in the axial direction.

The plate spring 9 is radially inside the disk pack 6 arranged. That is, an outer diameter of the diaphragm spring 9 smaller than an inner diameter of the disk pack 6 , The plate spring 9 So it is radially below the disk pack 6 arranged.

The plate spring 9 is in the axial direction between the trained as a pressure pot actuator 8th and the pressure plate 7 arranged. In the illustrated embodiment, the multi-plate clutch 1 designed as a normally-closed clutch. That is, the multi-plate clutch in an unactuated state of the actuating element 8th closed is. In this case, a constant contact force by the plate spring 9 provided the pressure plate 7 in the axial direction against the disk pack 6 pushes that the inner fins 3 and the outer plates 5 against an axially resistant counterpressure plate 10 be pressed and thus enable a frictional power transmission. For actuating the multi-disc clutch 1 , so to open the multi-plate clutch 1 , becomes the actuator 8th in the axial direction to the plate spring 9 shifted, ie against the biasing force of the diaphragm spring 9 , so that the contact pressure of the diaphragm spring 9 on the pressure plate 7 is lifted and the pressure plate 7 in the axial direction of the disk pack 6 is relocated away. As a result, the frictional power transmission between the inner plates 3 and the outer plates 5 canceled.

The plate spring 9 is in the axial direction between the counter-pressure plate 10 and the pressure plate 7 arranged. That is, the diaphragm spring 9 not axially to the disk pack 6 is offset, but that the diaphragm spring 9 at the same axial height we set the disk 6 or one of the inner disks 3 or the outer lamellae 5 is arranged.

In the multi-plate clutch 1 is an axial stop 11 formed, in each operating point of the multi-plate clutch 1 a push of the plate spring 9 about a flatness of the diaphragm spring 9 prevented. The axial stop 11 is depending on the version of the multi-plate clutch 1 as a normally-open or normally-closed clutch on the inner disk carrier 2 and / or on the actuating element 8th educated.

2 shows a further embodiment of the multi-plate clutch 1 , in which two disc springs 9 for applying the biasing force are present. The disc springs 9 Both are radially inside the disk pack 6 arranged and in the axial direction between the pressure plate 7 and the counterpressure plate 10 , or between the inner disk carrier 3 and the actuator 8th , The disc springs 9 are arranged in series. That means the two cup springs 9 are stacked interchangeably. In that case, a Belleville spring characteristic with longer travel can be realized with the same force.

On the inner disk carrier 2 is a first axial stop 12 for limiting the spring travel of the diaphragm spring 9 towards the inner disc carrier 2 available. On the actuator 8th is a second axial stop 13 for limiting the spring travel of the other diaphragm spring 9 towards the actuator 8th out there.

In particular, the multi-plate clutch 1 out 1 or 2 used in a clutch of a hybrid module to a torque of a second drive machine, preferably an internal combustion engine, on an intermediate shaft 14 , which also serves as an output shaft of a first drive machine, preferably an electric machine, to transmit. From the intermediate shaft 14 the torque is transmitted to a transmission input shaft of a transmission.

The outer disc carrier 4 is in the embodiment via a rolling bearing 15 on the intermediate shaft 14 stored. The pressure plate 7 and the actuator 8th are about a connecting element 16 rigidly connected.

LIST OF REFERENCE NUMBERS

1

multi-plate clutch

2

Inner disk carrier

3

inner plate

4

External disk carrier

5

outer plate

6

disk pack

7

pressure plate

8th

jig

9

feather

10

Platen

11

axial stop

12

first axial stop

13

second axial stop

14

intermediate shaft

15

roller bearing

16

connecting member

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102013214502 A1 [0002]
• WO 2016/070878 A1 [0003]

Claims (10)

Multi-plate clutch (1) for a drive train of a motor vehicle, with an inner disk carrier (2), in which at least one inner disk (3) is secured against rotation, but axially displaceable, an outer disk carrier (4), in which at least one outer disk (5) secured against rotation, but axially slidably received, the inner disks (3) and the outer disks (5) form a disk set (6), and a pressure plate (7) for adjusting the multi-plate clutch (1) by an actuating element (8) against the biasing force of a spring (9) is axially displaceable, characterized in that the spring (9) is arranged radially within the disk pack (6). Multi-plate clutch (1) to Claim 1 , characterized in that at least two springs (9) are present, against the biasing force of the pressure plate (7) is displaceable in the axial direction. Multi-plate clutch (1) to Claim 2 , characterized in that the at least two springs (9) are connected in series. Multi-disc clutch (1) according to one of Claims 1 to 3 , characterized in that an axial stop (11) for limiting a Einrückweges of the spring (9) is present. Multi-plate clutch (1) to Claim 4 , characterized in that a first axial stop (12) for the spring (9) on the inner disk carrier (2) is formed. Multi-plate clutch (1) to Claim 4 or 5 , characterized in that a second axial stop (13) for the spring (9) on the actuating element (8) is formed. Multi-disc clutch (1) according to one of Claims 1 to 6 , characterized in that the spring (9) is arranged in the axial direction at the height of the plate pack (6). Multi-disc clutch (1) according to one of Claims 1 to 7 , characterized in that the spring (9) in the axial direction between the pressure plate (7) and a counter-pressure plate (10) is arranged, wherein the counter-pressure plate (10) is designed so that the outer plates (5) and / or the inner plates (3 ) when closing the multi-plate clutch (1) against the counter-pressure plate (10) are pressed. Hybrid module for a motor vehicle, with a first drive machine, the torque transmitting connectable to a transmission input shaft, and a second drive machine, the torque transmitting via a clutch to an output shaft of the first drive machine is connected, characterized in that the separating clutch as a multi-plate clutch (1) according to one of the preceding claims is formed. Hybrid module after Claim 9 , characterized in that the first drive machine is arranged axially parallel to the transmission input shaft and / or to the second drive machine.

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