WO2019238157A1

WO2019238157A1 - Motor vehicle clutch slave cylinder having a steel flange and a pressure-chamber delimiting part comprising plastic, and motor vehicle clutch

Info

Publication number: WO2019238157A1
Application number: PCT/DE2019/100453
Authority: WO
Inventors: Michel Jacky; Julien Oster
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2018-06-12
Filing date: 2019-05-22
Publication date: 2019-12-19
Also published as: DE112019003000A5; DE102018125574A1; CN112262269A

Abstract

The present invention relates to a slave cylinder (1) for a clutch or a brake of a motor vehicle, such as a passenger car, a lorry or another utility vehicle. The slave cylinder (1) has a flange (2) which is made of steel and which is prepared, for example, for the attachment of a clutch. The flange (2) is provided for fastening to a clutch bell (3), and a pressure chamber (4, 5) is provided, in which a piston (6, 7) is pressure-dependently displaceably mounted. According to the invention, a pressure-chamber delimiting part (8) comprising plastic is fastened to the flange (2) in such a way that said pressure-chamber delimiting part forms at least one wall (9) of the pressure chamber (4). The invention also relates to a motor vehicle clutch having a slave cylinder (1) of this type.

Description

Motor vehicle clutch slave cylinder with a steel flange and a plastic-encompassing pressure chamber delimitation part and one

Motor vehicle clutch

The present invention relates to a slave cylinder for a clutch or a brake of a motor vehicle, for example a car, a truck or another motor vehicle, with a flange made of steel, which is prepared, for example, for attaching a clutch, the flange being fixed to a flange Clutch bell is provided and a pressure chamber is available in which a piston is mounted so that it can be moved in a pressure-dependent manner.

Such a generic slave cylinder for a clutch is known from patent EP 1 548 313 B1. The patent concerns one

Torque transmission device for the drive train of a motor vehicle for transmitting torque between an internal combustion engine with a crankshaft and a double clutch transmission with at least two

Transmission input shafts and two friction clutches. There is one each

Transmission input shaft can be coupled to the crankshaft by means of a friction clutch, and each friction clutch has an input and an output side

Friction units which form an axial compression along an axis of rotation of at least one of the transmission input shafts with one another

Frictional engagement can be applied. In addition, the friction units are each assigned to a friction clutch by means of one of the respective friction units

Actuated part against a stop and with the actuating part of each friction clutch with the interposition of an actuating bearing is arranged in each case a non-rotatably connected to a fixed housing part actuating device acting axially on the respective actuating part. In this torque transmission device, it is particularly emphasized that the friction units are formed from a plurality of friction partners alternating in layers in the axial direction on the drive side and on the output side, and that both

Friction clutches are operated in wet mode. Such a Clutch slave cylinder is still a bit too expensive to produce and is subject to high requirements in the manufacture of the slave cylinder.

It is therefore an object of the present invention to provide a slave cylinder for a clutch which is particularly cost-effective, can be manufactured even better and is weight-optimized compared to the slave cylinder from the prior art.

To achieve this object, the present invention provides one

Generic slave cylinder for a clutch or a brake

Motor vehicle before, which according to the invention a plastic

Has part of the pressure chamber or a plastic housing and is fixed to the flange so that it forms at least one wall of the pressure chamber.

Because the slave cylinder is not made entirely of steel, the slave cylinder can be produced more cheaply in comparison to a conventional slave cylinder which is made entirely of steel. Another advantage of the slave cylinder according to the invention is that it is easier to manufacture and that it is weight-optimized compared to a conventional slave cylinder. Furthermore, the slave cylinder according to the invention is compared to one

conventional slave cylinders easier to manufacture, since the pressure chamber is not created by machining, but rather, for example, by injection molding. Manufacturing by machining requires increased cleanliness or a cleaner working environment compared to manufacturing by injection molding and is therefore more labor-intensive, time-consuming and also more expensive.

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

A preferred embodiment provides that a radially inner wall and a radially outer wall of a first pressure chamber from the

Pressure chamber delimitation part is provided and / or a radially inner wall of a another second pressure chamber, which is arranged radially within the first pressure chamber, is provided by the flange. In this case, in which the

Slave cylinder has two pressure chambers, the slave cylinder is designed as a double CSC (Concentric Slave Cylinder) and a pressure chamber is completely formed by the pressure chamber delimitation part. Ergo is ideal for use with double clutches.

Said double clutch slave cylinder can accommodate a double clutch, which can be used, for example, for a double clutch transmission, wherein both clutches can be actuated independently of one another. Against the background of a motor vehicle clutch, it is possible that one clutch operates the even gears of a motor vehicle and the other clutch operates the odd gears. In particular, by the formation of two pressure chambers, one of which is completely formed in the pressure chamber delimitation part, the costs for the slave cylinder can be reduced and the producibility of the

Slave cylinder simplified and the weight reduced in comparison with a slave cylinder made entirely of steel.

In a further embodiment it can be provided that the

Pressure chamber boundary part is made entirely of plastic. In this case, the maximum weight saving of the slave cylinder according to the invention can be achieved in comparison with a slave cylinder which is made entirely of steel. If the pressure chamber delimitation part is made of plastic, it can be produced, for example, simply by injection molding, which requires very little effort in comparison to the production of a steel part. So that the pressure chamber delimitation part of the slave cylinder and thus the whole

Slave cylinder cheaper than a conventional slave cylinder, which is made entirely of steel.

It is also advantageous if a seal, in particular an O-ring, is inserted between the pressure chamber delimitation part and the flange in contact with the pressure chamber and sealing it. Because of the flange and the seal not in one piece, but in several pieces and made of two different materials, it is possible to seal the flange against the seal. This seal then particularly effectively prevents leakage from equipment that is introduced into the pressure chamber.

It has proven itself when the piston is in direct contact or under

Intermediate layer of a dynamic sealing element bears with the walls of the respective pressure chamber. In other words, this means that the piston alone, or

together with the dynamic sealing element, completely fills the respective pressure chamber in the radial direction. Such close contact between the piston and the pressure chamber is conducive to optimal pressure generation in the pressure chamber. The piston moves in the axial direction of the pressure chamber.

A further preferred embodiment provides that a thread, in particular a fine thread, is provided on the preferably radial inside of the flange for receiving the coupling. Because the thread that receives the coupling is formed in the steel flange, the thread can be manufactured significantly more precisely than if the thread is formed in a plastic part. In the case where a fine thread is used, the load capacity of the thread is higher than with a regular thread. It is also to ensure sufficient stability and / or rigidity and / or strength of the

Slave cylinder and the thread makes sense to form the flange from steel, and not from plastic, such as the pressure chamber delimitation part. Through the

To ensure sufficient thread stability, the coupling can also be securely attached to the flange over a long period of operation.

If at least one inlet channel for the pressure chamber in the

Pressure chamber limitation part is integrated, a particularly versatile device can be produced. This means that in particular the inlet channel, for example in the manner of a bore, is completely surrounded by the material of the pressure chamber delimitation part. The operating medium, for example, can be in the pressure medium via this inlet channel

Hydraulic oil, which are used to exert a compressive force on the piston is used in the pressure room. In the case where the slave cylinder is two

Has pressure chambers, the pressure chamber delimiting part can have two integrated

Have inlet channels. The fact that the inlet channel is integral with the

Pressure chamber delimitation part is formed, it is not necessary to continue to seal this at least one channel.

The invention can also be further developed in that a coupling oil duct is introduced into the flange, the coupling oil duct being able to be produced in particular by machining. By providing the clutch oil channel in the flange, and not, for example, in the pressure chamber delimitation part, the clutch oil can be supplied to the clutch directly, without detours.

Furthermore, it can be provided that the clutch oil channel via a

circumferential foam seal is sealed. This seal prevents one

premature escape of the clutch oil, for example in the pressure chamber delimitation part, or a pressure chamber where the clutch oil is undesirable.

The clutch oil duct and the supply duct for the equipment or

Hydraulic oil are formed separately from each other, so that the two

Do not undesirably mix liquids or fluids. It is also advantageous that the operating medium supply channel is not formed in the flange in order to be able to manufacture it as uncomplicatedly as possible.

The invention also relates to a motor vehicle clutch, for example in the manner of a double clutch, with such a slave cylinder.

In other words, a CSC slave cylinder according to the invention is

in particular double clutch slave cylinder (D-CSC), provided for a clutch, in particular double clutch, which has a steel CSC flange, which accepts the clutch by means of a thread, in particular a fine thread, and which

Connects to a clutch bell and combines a CSC housing made of plastic, which partially forms the pressure chambers. The combination of a plastic CSC housing with a steel CSC flange simplifies this

Steel flange geometry significantly compared to conventionally manufactured slave cylinders, usually made of one material, in particular made of steel. This significantly reduces the price of the slave cylinder and the technical requirements placed on it.

The CSC housing and the CSC flange are preferably sealed to each other by an O-ring and screwed together on the clutch bell.

Furthermore, it is provided that the operating medium is supplied by means of two inlet bores which are integrated in the CSC housing, one inlet bore being provided for each pressure chamber.

Furthermore, the slave cylinder is designed so that the supply of the

Coupling cooling oil to the coupling axis on the flange takes place by means of a machined channel. The supply for the clutch cooling oil is through a rotating

Foam seal sealed.

Below is an embodiment of the invention

Slave cylinder of a motor vehicle clutch described in detail with reference to the accompanying drawings.

1 shows a longitudinal sectional view of a slave cylinder for receiving a clutch for a motor vehicle with a pressure space delimitation part, or

Housing, made of plastic and a flange made of steel;

Fig. 2 is a perspective view of the slave cylinder with a plastic pressure chamber limiting part which is connected to the steel flange, and further shows a biasing plate and two welding plugs, each on

Slave cylinders are attached; Fig. 3 is a top view of the built in a clutch bell

Slave cylinder and shows a supply for clutch cooling oil on the steel flange and an operating medium supply opening on the plastic pressure chamber delimitation part;

Fig. 4 is a cross-sectional view taken along the line IV-IV of Fig. 1 and shows the slave cylinder installed in the clutch bell.

The figures are only schematic in nature and only serve to understand the invention. The same elements become the same reference symbols

assigned. The embodiment is only exemplary and the invention is not limited to it.

1 shows the longitudinal sectional view of a slave cylinder 1, which has a steel flange 2, which represents the connection to a clutch bell 3. The slave cylinder 1 also has a first pressure chamber or a first

Pressure chamber 4 and a second pressure chamber or a second pressure chamber 5.

A first piston 6 is mounted axially displaceably in the first pressure chamber 4 and a second piston 7 is axially displaceably mounted in the second pressure chamber 5. The pistons 6, 7 can be actuated independently of one another.

The steel flange 2 is with a pressure chamber delimitation part or

Connected housing 8, which is made of plastic. The first pressure chamber 4 is completely formed in the pressure chamber delimitation part 8. A first wall 9, together with a second wall 10, which is arranged radially outside the first wall 9 and is parallel to it, forms the first pressure chamber 4. The first wall 9 and the second wall 10 each extend perpendicularly from the main part of the pressure chamber delimitation part 8 and are spaced vertically from one another in order to form a stop surface for the first piston 6 in the first pressure chamber 4. The second pressure chamber 5 is formed by the interaction of the first wall 9 with the cylindrical part of the steel flange 2. In the sectional view of Fig. 1, the first wall 9 and the cylindrical part of the Steel flange 2 arranged parallel to each other and in the vertical direction

spaced from each other.

The first piston 6 and the second piston 7 are each provided with a first or a second seal carrier ring 11 or 12, which contributes to the fact that the pistons 6, 7 bear with their outer peripheral surface against the walls 9, 10 of the pressure chambers 4, 5 ,

When an operating medium or hydraulic oil is injected or introduced into the first pressure chamber 4 or the second pressure chamber 5, the first piston 6 or the second piston 7 moves in an axial direction, specifically away from the latter

Pressure chamber delimitation part 8. The movement of the first piston 6 or the second piston 7 moves a first bearing 13 or a second bearing 14, which are in each case an engagement or a disengagement bearing. The bearings 13, 14 serve to actuate a clutch, which is not shown here. To leak the

Suppressing resources from the pressure rooms 4,5 is that

Pressure chamber delimitation part 8 sealed against the steel flange 2 by an O-ring 15. The steel flange faces on the outer peripheral surface of its

cylindrical portion in transition to its flat flange portion a projection 16. The projection 16 interacts with the pressure chamber delimitation part 8 in such a way that the second piston 7 in the second pressure chamber 5 in an engaged state both on the pressure chamber delimitation part 8 and on

Projection 16 strikes. The O-ring 15 is arranged in the vertical gap which is formed by a distance between the pressure space delimitation part 8 and the projection 16.

Fig. 2 shows a perspective view of the slave cylinder 1, in which the

Pressure chamber limitation part 8 is connected to the steel flange 2. The main part 17 of the slave cylinder 1 is annular. In FIG. 2, three projections extend from the annular main part 17; a first assembly projection 18, a second assembly projection 19 and a third assembly projection 20. These

Mounting projections 18, 19, 20 are each with a mounting hole or one Provide mounting hole 21. In the area of the projections 18, 19, 20 that is

The pressure chamber delimitation part 8 is arranged above the steel flange 2 and the identical mounting holes 21 are formed continuously over the entire thickness of the projections 18, 19, 20 and thus through holes are provided (in the plastic pressure chamber delimitation part 8 and in the steel flange part 2, the mounting projections 18, 19, 20 over here here).

The annular slave cylinder main part 17 has a through hole 22 in the center. At least one of the projections 18, 19, 20, here the first assembly projection 18, has one formed from the steel flange 2 in its main shape

disc-shaped flange projection 23. It also extends from the

The main part 17 of the slave cylinder 1 consists of a housing projection 24 which is formed integrally or in one piece and / or in one material with the pressure space delimitation part 8. The housing projection 24 has a prestressing plate 25, which spans two pipe sections 26 and 27 which are angled towards one another and run away from one another at the end of the main part 27. The tube sections 26, 27 each have a welding plug 28, 29 on the inside of their opening.

3 is a plan view of the one installed in a clutch bell 3

Slave cylinder 1. In this embodiment, the slave cylinder is screwed to the clutch bell 3 by means of the mounting holes 21 on the mounting projections 18, 19, 20. Both the housing projection 24 and the flange projection 23 abut the clutch bell 3. An inlet channel (not shown) runs in the flange projection 23 and is suitable for supplying clutch cooling oil to the clutch that is received by the slave cylinder 1. The housing projection 20 has in its two tube sections 26, 27 each an operating medium supply channel 30, 31 which is provided for supplying an operating medium or hydraulic oil into the first pressure chamber 4 or the second pressure chamber 5, around the first piston 6 or the to move the second piston 7 axially.

The housing projection 24 is fastened directly to the clutch bell 3 with the aid of the prestressing plate 25. The clutch bell 3 has an annular basic shape and has a hole in the center, which is formed continuously with the through hole 22 of the main part 17 of the slave cylinder 1. The clutch bell 3 is designed like a disc. This disk has a surface (section) offset from its outer surface in a depth direction and parallel to it, on which the slave cylinder 1 rests with its lower surface. The shape of the cutout essentially follows the shape of the slave cylinder 1.

FIG. 4 is a cross-sectional view along the line IV-IV of FIG. 1 and shows the slave cylinder 1 which is mounted on the clutch bell 3. In this

The operating means or hydraulic oil supply channels 30, 31 are shown in a sectional view. The operating medium supply channels 30, 31 are in the pipe sections 27 ^' 6,

27 and thus formed in the pressure chamber delimitation part 8.

List of reference numerals slave cylinder

flange

Kupplungsglocke

first pressure chamber

second pressure chamber

first piston

second piston

Pressure chamber limitation part / plastic housing first wall / radially inner wall

second wall / radially outer wall of the first seal carrier ring

second seal carrier ring

first camp

second camp

O-ring

Projection (on steel flange)

Main part of the slave cylinder

first assembly lead

second assembly projection

third assembly projection

mounting hole

Through hole (in the main part of the slave cylinder) flange projection

housing projection

biasing plate

First pipe section

second pipe section

first welding plug

second welding plug 30 first resource supply channel

31 second resource supply channel

Claims

claims

1. slave cylinder (1) for a clutch or a brake of a motor vehicle with a flange (2) made of steel, the flange (2) being provided for fixing to a clutch bell (3) and a pressure chamber (4, 5) being present , in which a piston (6, 7) is displaceably mounted in a pressure-dependent manner, characterized in that a plastic-encompassing

Pressure chamber delimitation part (8) on the flange (2) is fixed in such a way that it forms at least one wall (9) of the pressure chamber (4, 5).

2. slave cylinder (1) for a clutch or a brake of a motor vehicle according to claim 1, characterized in that a radially inner wall (9) and a radially outer wall (10) of a first

Pressure chamber (4) is provided by the pressure chamber delimitation part (8) and / or a radially inner wall of a further second pressure chamber (5), which is arranged radially within the first pressure chamber (4), is provided by the flange (2).

3. slave cylinder (1) for a clutch or a brake of a motor vehicle according to claims 1 or 2, characterized in that the pressure chamber delimitation part (8) is made entirely of plastic.

4. slave cylinder (1) for a clutch or a brake of a motor vehicle according to one of claims 1 to 3, characterized in that between the pressure chamber delimitation part (8) and the flange (2), in contact with the pressure chamber (4, 5) and sealing this, a seal (15) is inserted.

5. slave cylinder (1) for a clutch or a brake of a motor vehicle according to one of claims 1 to 4, characterized in that the piston (6, 7) in direct contact with the walls (9, 10) of the respective pressure chamber (4, 5) is located or with the interposition of one dynamic sealing element (11, 12) with the walls (9, 10) of the respective pressure chamber (4, 5).

6. slave cylinder (1) for a clutch or a brake of a motor vehicle according to one of claims 1 to 5, characterized in that on the inside of the flange (2) a thread is provided for receiving the clutch.

7. slave cylinder (1) for a clutch or a brake of a motor vehicle according to one of claims 1 to 6, characterized in that at least one inlet channel (30, 31) for the pressure chamber (4, 5) in the pressure chamber delimitation part (8) is integrated ,

8. slave cylinder (1) for a clutch or a brake of a motor vehicle according to one of claims 1 to 7, characterized in that a clutch oil channel is introduced into the flange (2).

9. slave cylinder (1) for a clutch or a brake of a motor vehicle according to claim 8, characterized in that the

Clutch oil channel is formed over a circumferential seal.

10. Motor vehicle clutch with a slave cylinder (1) according to one of the preceding claims.