WO2007060357A1

WO2007060357A1 - Single-control double multidisc clutch device with an oil bath

Info

Publication number: WO2007060357A1
Application number: PCT/FR2006/051182
Authority: WO
Inventors: Michel Raoul; Jean-Michel Teixeira
Original assignee: Renault S.A.S.
Priority date: 2005-11-24
Filing date: 2006-11-16
Publication date: 2007-05-31
Also published as: FR2893685B1; FR2893685A1

Abstract

Double multidisc clutch device with an oil bath, comprising two concentric clutches (1, 2) each having at least one bell housing (6, 13) and a piston (18, 28) bearing a set of friction discs (12, 29) which, in the closed position, are capable of transmitting the torque of an engine to two concentric primary shafts (9, 32) of a gearbox, characterized in that the two clutches (1, 2) are controlled by the same operating system.

Description

DOUBLE MULTI-CLUTCH CLUTCH DIFFUSIVE WITH A BAI N OF HUI THE UNI EN THAT

The present invention relates to multidisc clutches for motor vehicle transmission.

Rus precisely, it relates to a clutch device comprising two concentric clutches each having a bell and a clutch piston supporting a set of friction discs capable of transmitting the torque of the same motor to two concentric primary shafts of a box. in the closed position.

This device finds a privileged application in a transmission where it is associated with a gearbox with two concentric primary shafts, robotized or not, in which these two shafts are respectively stressed by the first and the second clutch of the device. The double clutch devices usually used in this type of transmission may be simple or multi-disc, dry or wet.

When they are multidisc and wet, it is called clutch multiple multidiscs, oil bath. Publication US 2005/0139023 discloses a clutch device of this type, in which the control of the clutches is itself hydraulic.

The hydraulic control system of such a clutch is complex, in particular because the opening and closing of the two clutches are controlled simultaneously during the gearshift under torque.

The present invention aims to simplify the maneuvering of a multi-disc clutch device with an oil bath, in particular to improve the reliability and robustness of the control means used.

For this purpose, it proposes that the two clutches of the device are controlled by the same operating system. According to another characteristic of the invention, each clutch is provided with means for amplifying the closing force of its disks.

The first clutch has for example means for pressurizing its disks, which guarantee the opening of the second clutch in the rest position.

Thus, a first movement of the operating system away from its rest position makes it possible to ensure the opening of a first clutch without maneuvering the second clutch, so as to place the device in a second position, where the two clutches are open, while the further movement of the operating system in the same direction, after the opening of the two clutches, ensures the movement of the device in a third position where the first clutch is open, and or the second is closed.

Other features and advantages of the present invention will become apparent from the following description of a non-limiting embodiment thereof, with reference to the accompanying drawings, in which:

FIG. 1 represents the device proposed in a first position where a first clutch is closed, and the second clutch is open; FIG. 2 represents the same device in a second position where the two clutches are open,

FIG. 3 shows the same device in a third position, where the first clutch is open, and the second clutch is closed, and FIG. 4 is a section along AA of the previous figures.

The clutch device described in the figures has a first clutch 1, and a second clutch 2, arranged inside a housing 3 closed by a flange 4. The first clutch 1, or external clutch, comprises a first outer bell 6 or inlet bell, sheet. At its central end, the bell 6 is fluted to receive the torque and the movement of the engine from a damping flywheel (not shown). The bell 6 is closed by a plug 7, sealing the device vis-à-vis the outside. The bell 6 is mounted in its central portion 6a, on a guide ring 8, on the primary shaft 9 of the box. The outside of the central portion 6a, cooperates with a dynamic seal 11, on the closure flange 4 of the device.

The first outer bell 6 has a cylindrical portion 6b, notched or grooved on the inner face to transmit the movement to first friction discs 12 retained by a clip 13. On its outer portion, it has for example lugs (not shown) , which cooperate with recesses of an intermediate bell 14, constituting the outer bell of the second clutch 2 of the proposed device, retained by a clip 16. The intermediate bell, or second outer bell 14, is driven by the first outer bell 6. It is supported on the closing flange 4, via a needle stop 41. A first adjustment wedge 5 is disposed between the outer bell 6 of the first clutch 1 and the lid 4 of the device, so that to ensure the positioning of the latter vis-à-vis the operating system, and to adjust the wear of the first clutch 1.

The disks 12 of the first clutch 1, or first disks of the device, transmit the movement of the first outer bell 6 to the first piston 18 of the device. These disks have notches in outer or inner parts, and are alternately connected to the outer bell 6 and to the piston 18. They are coated with a suitable friction coating and are retained axially by the clip or stop ring 13, mounted on the inner bell 19 of the first clutch 1, or first inner bell of the device.

On the central cylindrical portion 19a of the first inner bell 19, is bonded (for example by welding) a sleeve 21, internally splined to transmit the torque and movement to the primary shaft 9 of the box vits esses.

The first piston 18 is guided in its central cylindrical portion 18a, by the first inner bell 19. Its outer portion is composed of a flank 18b, which bears on the first discs 12. The flank 18b consists of different sectors (not visible on the diagrams), which allows its nesting in the first inner bell 19, which also consists of distinct sectors. The piston 18 comprises a cylindrical outer part 18c, also composed of sectors, which are notched externally and cooperate with the discs 12. The first clutch 1 is provided with pressurizing means, such as a spring 22, of the wavy washer type , or Belleville washer, which is interposed between the flanks 18b of the piston 18 and the inner bell 19. The spring 22 is "preloaded", and pushes the piston 18 and the bell 19, so as to pressurize the first discs 12, and keep the first clutch 1 closed.

The first clutch 1 also has clamping assistance means, comprising a set of elements 23, 24, operating in pairs. One element 23 of each pair is connected to the inner bell 19 and the other 24 to the piston 18. As shown in FIG. 4, each element has ramps of the same angle which cooperate and interact with one another. the effect of the torque transmitted by the discs. The pair passes from the piston 18 to the inner bell 19 by the ramps of the elements 23, 24. The elements repelling each other, they push the piston 18 and the lower bell and 19, thereby increasing the clamping of the discs 12 provided by the closing spring 22. These means constitute a self-help system. Combined with the spring 22, they allow to exert sufficient pressure on the discs 12, to dispense with conventional hydraulic control systems.

The second clutch, or inner clutch 2, also includes an outer bell 13, a set of disks 26, an inner bell outlet 27, a piston 28, and assist means 23, 24.

The second outer bell 14, or sheet metal inlet bell of the second clutch 2, is centered on the outer diameter of the first outer bell 6. It is held axially on one side by the latter, and on the other side by the clip 16. It is cylindrical is notched or grooved internally on its large diameter to transmit the movement to the discs of the second clutch, or second discs 29, which are retained by a clip 31.

The second outer bell 14, has on its outer part, recesses which cooperate with lugs of the first outer bell 6, and allow its driving therewith.

The second discs 29 transmit the movement of the bell 14 to the second piston 28. The discs 29 have notches, partly external or internal, and are alternately connected to the bell 14 and the piston 28. They are coated with a suitable coating , and are retained axially by the clip, or stop ring 31, mounted on the inner bell 27.

The inner bell 27 transmits movement and torque to the second primary shaft 32 of the box. It rests axially on the right on a needle stop 33. The stop 33 is based on the first inner bell 19, which bears on the first outer bell 6, itself bearing on the flange 4. To the left, the bell 13 is against a spring, or corrugated washer, 34, placed between its two bearing washers 36, which itself bears on the housing 3.

The second piston 28 is guided in its central cylindrical portion 28a, by the first piston 18. Outside, it has a flank 28b, which bears on the discs 29. The flank 28b is in sectors, which allows its nesting in the second inner bell 27, which is also broken down into sectors. The piston 28 has a cylindrical outer portion 28c, also in sectors, notched externally, and which cooperates with the discs 29. The piston 28 extends on the left, protuberances by sectors 28d, which pass through the inner bell 29. These excrescences carry a bearing 37, which allows the actuation of the pistons 18, 28. The first piston 18 is supported axially on the second piston 28 by means of a needle stop 38 and a shim 39, adjusting the clearance J 1, that is to say the opening stroke of the second clutch 2. The second assistance means comprise, as the first, elements 23, 24 operating in pairs. One of the elements is connected to the second inner bell 27, the other to the second piston 28. The two elements comprise ramps of the same angle which cooperate and interact with each other under the effect of the torque transmitted by the disks. . The pair passes from the second piston 28 to the second inner bell 27, via the ramps. Then, the two elements repel, push the piston 28 and the inner bell 27, and thus amplify the tightening of the discs 29 caused by the closing spring 34. These means constitute, like the former, a real self-help system . The double clutch device is disposed inside the clutch housing 3, in a compartment closed by the cover, or flange 4, which seals relative to the housing 3, and relative to the first bell, or top bell 6. The lid 4 also receives a stop at needles 41 (or a bearing), which takes the axial forces of the corrugated washer 34 on the clutch housing side 3 (through the other needle stops 33, 38, 17), and the external force applied to the bearing The operation of the dual clutch device provided by the invention is as follows. Maneuvers of the clutch device are performed by applying a force and a displacement through the bearing (or needle thrust bearing) 37, carried by the second piston 28.

In Figure 1, the first clutch 1 is closed, and the second clutch 2 is open. In this first operating position, the device receives no external effort:

the first clutch 1 is closed under the action of the spring 22, interposed between the first piston 18, and the first inner bell 19, and

the second clutch 2 is open, and its disks 29 have a release clearance J1, the pressurizing spring 34, guaranteeing the opening of its disks 29 in this position.

In Figure 2, the clutch device is shown in a second operating position, with application of an external force on the actuating bearing 37. In this intermediate position: - the second clutch 2 is open: the displacement of the second piston 28 is insufficient for contacting its disks 29, which have a clearing clearance J 2;

the first clutch 1 is open; the displacement of the first piston 18 is equal to that of the second piston 28, since the latter presses on the first via the needle stop 38;

the discs 12 have an operating clearance J 3, since the displacement of the first piston 18 is sufficient for the loss of contact of the discs 12, which therefore debates in the game J 3. In FIG. 3, the clutch device is shown in a third operating position, with application of an external force and displacement value greater than those of FIG. 2:

the second clutch 2 is closed, the displacement of the second piston 28 being sufficient for pressurizing the disks 29,

the first clutch 1 is open: its discs 21 have a clearance J 4, sufficient to ensure a low drag of the clutch.

Claims

A dual oil-filled multi-disc clutch device comprising two concentric clutches (1, 2) each having at least one bell (6, 13) and a piston (18, 28) supporting a set of friction discs (12). , 29) capable of transmitting in the closed position the torque of a motor with two concentric primary shafts (9, 32) of a gearbox, characterized in that the two clutches (1, 2) are controlled by the same operating system. Clutch device according to Claim 1, characterized in that the system for operating the clutches (1,

2) includes an actuating bearing (37) carried by the piston (28) of one of the clutches.

3. Clutch device according to claim 2, characterized in that the bearing (37) receives the thrust of a clutch maneuvering fork (42).

4. Clutch device according to claim 12 or 3, characterized in that each clutch (1, 2) is provided with amplification means (23, 24), the closing force of its disks (12, 29). ).

Clutch device according to one of the preceding claims, characterized in that the operating system is at rest in a first position in which a first clutch (1) is closed under the action of a closing spring ( 22) interposed between its outer bell (6) and its piston (18), while the second clutch (2) is open.

6. Clutch device according to one of claims 5, characterized in that the second clutch (2) has pressurizing means (34) which ensure the opening of its disks (29) in the rest position .

7. Clutch device according to claim 5 or 6, characterized in that a first movement of the operating system away from its rest position ensures the opening of the first clutch (1) without closing the second clutch (2). ), so as to place the device in a second position, where the two clutches are open.

8. A clutch device according to claim 7, characterized in that the further movement of the operating system in the same direction after the opening of the two clutches (1, 2), places the device in a third position where the first clutch (1) is open, and where the second (2) is closed.

9. A clutch device according to one of claims 4 to 8, characterized in that the amplification means are composed of interposed elements (23, 24) between the lower latch (19, 27), and the piston (18). , 28) of each clutch (1, 2).

10. A clutch device according to claim 9, characterized in that the elements (23, 24) respectively connected to the bell and the other to the piston of a clutch have inclined ramps which cooperate to push the bell (19, 27) and the piston (18, 28) of the clutch, by amplifying the tightening of the discs (12, 29) under the effect of the transmitted torque.

11. Clutch device according to one of the preceding claims, characterized in that it has a first adjustment wedge (5) disposed between the outer bell (6) of the first clutch (1) and the cover (4) of the device, so as to ensure the positioning thereof with respect to the operating system

12. A clutch device according to claim 1, characterized in that the first shim (5) allows to adjust the wear of the first clutch wear.

13. A clutch device according to one of the preceding claims, characterized in that it has a second adjusting wedge (39) disposed between the pistons (18, 28) of the two clutches (1, 2).

14. A clutch device according to claim 13, characterized in that the second shim (39) adjusts the opening clearance J1 disks (29) of the second clutch (2).