DE102009056380B4 - clutch release - Google Patents

Abstract

A clutch release system (10) for a double clutch of a vehicle consisting of two partial clutches, wherein the clutch release system (10) has at least two annularly formed pistons (2, 3), each partial clutch comprising an annular piston (2) arranged and guided in a common housing (1) , 3), characterized in that the lateral surface of at least one of the pistons (2, 3) has at least one perpendicular to the direction of actuation reference encoder (6) which is provided for sensing the inner piston (3) and whose length from the lateral surface the housing (1) protrudes and in the housing (1) in the region of the / the reference encoder (r) (6) are provided to the length of Kolbenausrückweges adapted recesses.

Description

The invention relates to a clutch release system for a two-clutch double clutch of a vehicle according to the preamble of claim 1.

From the prior art is with the DE 102 42 841 A1 a clutch release system for a simple clutch is known which has a displacement measuring device. With this displacement measuring device, the axial position of the piston guided in the releaser can be determined in the course of its displacement. For this purpose, the piston is connected to a collar which comprises a radially outwardly extending support arm, which carries a magnet at the radial end. This magnet is designed in the form of an insert. This magnet or magnetic encoder is associated with the position of the piston in the releaser outside the housing of the releaser, a sensor position position.

In contrast, a dual clutch comprises two essentially separate clutch modules or clutch units, which can independently interrupt or produce the torque connection between a motor and a transmission. A preferred application of such a dual clutch is the combination with a dual-clutch transmission. The first clutch unit operates, for example, the odd gear ratios, while the second clutch unit operates the even gears. In this way, while on the one clutch unit currently a torque is transmitted from the engine to the transmission, already another gear are already selected to then switch without interrupting the traction of the current gear in the preselected gear. The transmission input shaft is usually constructed for this purpose from two concentric shafts, that is, from a hollow shaft and an internal solid shaft. The actuation of the coupling units takes place in each case by a release device. The actuation of the release devices by means of pistons, one inside or centrally and the other piston is arranged outside or outside.

The distance measurement in this conventional application is also usually contactless by inductive sensors or Hall sensors, which are mounted on the CSC housing and sense the movement of the actuated pistons.

For reasons of space, in the radial and axial direction, it is not possible in most cases to place a sensor for the inner piston.

Further prior art is in the US 5 794 752 A as well as the DE 103 51 993 A1 disclosed.

Therefore, the object of the invention is to provide a Kupplungsausrücksystem for a dual clutch, with the distance measurement of the inner piston is possible in an axially limited space.

This object is achieved with a clutch release system for a dual clutch having the features of claim 1.

In a clutch release system for a double clutch of a vehicle consisting of two partial clutches, wherein each partial clutch is assigned an annular piston arranged and guided in a common housing, the lateral surface of at least one of the pistons has at least one reference transmitter arranged at right angles to the actuating direction, the length of which extends out of the lateral surface protrudes from the housing. Accordingly, in the housing in the area of the / the reference encoder (r) to the length of Kolbenausrückweges adapted recesses are provided. These recesses are advantageously designed as slots.

In an advantageous embodiment of the invention, the reference encoder has the shape of a pin.

To ensure an axial Ausrückweges both pistons these are mutually against rotation.

To sense the respective position of the piston or at least one piston is advantageously the corresponding reference encoder with a sensor associated therewith in operative connection.

The invention will be explained in more detail with reference to an embodiment and associated drawings.

• 1 bis 4 schematische Schnittdarstellungen eines erfindungsgemäßen Ausrücksystems für eine Doppelkupplung, in denen die Kolben jeder Teilkupplung unterschiedliche Positionen einnehmen.

Show it:

• 1 to 4 schematic sectional views of a disengagement system according to the invention for a dual clutch, in which the pistons of each sub-clutch occupy different positions.

The 1 to 4 show an inventive release system 10 for a double clutch with the same construction. The figures differ only in the different disengagement position of the respective piston 2 . 3 ,

So there is the release system of the invention 10 essentially from a housing 1 in which recesses are provided for insertion of concentrically arranged annularly shaped piston 2 and 3 , In this case, the piston 3 radially inside the piston 2 arranged. Every piston 2 . 3 is a release bearing 4 . 5 assigned, which serves to actuate the corresponding part clutch of the double clutch. That's the piston 3 with the release bearing 5 connected while the piston 2 with a release bearing 4 is in active connection. At the other end of each ring piston 2 . 3 is in each case an annular sealing element 8th . 9 appropriate. Because both pistons 2 . 3 in this figure are shown in their minimum position, their pressure chambers R1 . R2 not recognizable when moving the pistons 2 . 3 between these and the surrounding housing 1 is formed.

For sensing the Ausrückweges of the inner piston 3 is at this in the radial direction a detection element in the form of a pin 6 intended. This pen 6 can preferably be insoluble with the lateral surface of the piston 3 , such as, for example, cast or glued or even releasably with this, for example, be screwed. To achieve that pin 6 with one outside the release system 10 arranged sensor 7 can come into operative connection, has in the range of the required Ausrückweges the housing 1 a slot A on. This slot A is identical in form and congruent with a slot B in the lateral surface of the housing 1 , The length of the pen 6 is to be dimensioned so that this from the lateral surface of the housing 1 protrudes. In the in 1 shown end position of the piston 2 and 3 is the one with the piston 3 movable pen 6 also in its final position.

In 2 are the pistons 2 and 3 of the release system 10 in contrast, in different positions. This is the piston 2 still in its most minimal disengagement position. The piston 3 By contrast, it is maximally disengaged, as a result of which the annular pressure chamber R1 becomes visible. The pin carried by this disengagement process 6 is in this position of the piston 3 also in its maximum position.

In 3 has the piston 2 its maximum end position taken and the piston 3 its minimalist end position. In this case also has the pen 6 its minimum position or end position taken.

In 4 are both pistons 2 and 3 maximally disengaged, that means that also the pen 6 is in its maximum end position.

Through the into the housing 1 introduced congruent slots A . B becomes the pen 6 by allowing referencing of the respective disengagement position radially outward through the housing 1 led, where outside of this a displacement sensor is placed. When operating the piston 3 thus becomes the pen 6 moved, whereby the direct actuating travel or the respective position of the piston 3 is determinable.

LIST OF REFERENCE NUMBERS

1

casing

2

piston

3

piston

4

release bearing

5

release bearing

6

Pen / reference encoder

7

sensor

8th

sealing element

9

sealing element

10

release system

A

Long hole / recess

B

Long hole / recess

R1

pressure chamber

R2

pressure chamber

Claims (5)

A clutch release system (10) for a double clutch of a vehicle consisting of two partial clutches, wherein the clutch release system (10) has at least two annularly formed pistons (2, 3), each partial clutch comprising an annular piston (2) arranged and guided in a common housing (1) , 3), characterized in that the lateral surface of at least one of the pistons (2, 3) has at least one perpendicular to the direction of actuation reference encoder (6) which is provided for sensing the inner piston (3) and whose length from the lateral surface the housing (1) protrudes and in the housing (1) in the region of the / the reference encoder (r) (6) are provided to the length of Kolbenausrückweges adapted recesses. Coupling release system (10) according to Claim 1 , characterized in that the reference transmitter (6) has the shape of a pin. Coupling release system (10) according to Claim 1 , characterized in that the recesses in the housing (1) have the shape of a slot. Coupling release system (10) according to Claim 1 , characterized in that the pistons (2, 3) are secured against rotation to each other. Coupling release system (10) according to Claim 1 , characterized in that in each case a reference sensor (6) with a sensor associated therewith (7) is in operative connection.

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