KR101205149B1 - Friction clutch, in particular for a motor vehicle - Google Patents

Abstract

The friction clutch is intended to combine two substantially coaxial rotational input and output elements. The friction clutch includes two guide washers (8, 12) fixedly rotated to the input or output element, a damper plate (13) fixedly rotated together to the output or input element, guide washers (8, 12) and damper Damping comprising a circumferentially elastic member 14 accommodated in the windows 8F, 12F, 13F provided in the plate 13 and friction means acting axially on the central portion of the first guide washer 12. Means; The clutch further comprises means (T, D) for contacting the central portion of the first guide washer (12) with respect to the second guide washer (8). Preferably, the contacting means abuts against the substantially radial teeth D on the second guide washer 8, so that the substantially axial lug T is fixed to the center of the first guide washer 12. Include.

Description

Friction clutch {FRICTION CLUTCH, IN PARTICULAR FOR A MOTOR VEHICLE}             

1 is an upper half view of an axial cross section of a friction clutch according to the invention,

2 is a bottom half view of the axial section of the friction clutch according to the invention,

3 is a perspective view of an element of a predamper of the friction clutch shown in FIGS. 1 and 2;

4 is a perspective view of a second guide washer of the predamper;

5 is a perspective view of a damper plate of the predamper;

6 shows the internal contour of the damper plate of the predamper,

7 is a perspective view of a first guide washer of the predamper;

DESCRIPTION OF THE REFERENCE NUMERALS

1: friction disc 2: cylindrical hub

3, 4: guide washers 5, 6: annular bearing

8: annular damper plate 9: helical spring

The present invention relates to a friction clutch for automobiles.

In automobiles, the friction clutch ensures the continuity of torque and filters the vibrations coming from the engine, as well as the friction transfer between the pressure plate and the engine flywheel, thus providing the ability to transfer torque between the rotational input element and the rotational output element. do.

For example, in the prior art according to French Patent Publication No. 2 804 190 (French Patent Application 00 00950), two guide washers are fixedly rotated together on the input element or the output element and rotate together on the output element or the input element. A damping means having a damper plate securely fixed, a circumferentially elastic member received in the guide washer and a window provided in the damper plate, and damping means having axially acting friction means on the central portion of the first guide washer. The friction clutches for automobiles which are intended to combine two substantially coaxial rotational input elements and output elements are already known.

The damping means generally comprise energy accumulating means (in particular springs) and energy dissipating means comprising friction means.

More specifically, the damping means is arranged in the friction device of the clutch. The input element is formed by a friction disk and the output element is formed by a hub, which is especially intended to be coupled to the transmission input shaft.

The damping means forms a predamper of this friction means. The predamper includes a friction washer elastically pressed against the center of the first guide washer by an axially acting elastic washer.

Moreover, the friction device further comprises a main damper. The second guide washer of the predamper forms a damper plate of the main damper. The friction disk is fixed to the first guide washer of the main damper. An elastic damper acting in the axial direction is interposed between the friction washer and the guide washer of the main damper supported by this elastic member in the axial direction.

However, the first guide washer of the predamper is largely perforated due to the presence of a window that receives a spring that acts in the circumferential direction, and the relatively small diameter of the first guide washer of the predamper. Therefore, the first guide washer of the predamper is not stiff in the axial direction and tends to deform under the influence of the elastic washer acting in the axial direction (the first guide washer of the predamper is formed conical). This deformation can cause parasitic friction between the damper plate and the first guide washer of the predamper.

One solution is to preconform the first guide washer of the predamper into a conical shape so as to be flat under the influence of the load of the elastic member acting in the axial direction. However, these loads are variable, especially depending on the vehicle or engine. As a result, the predeformation of the guide washer depends on the load applied to it. Thus, such predeformation is undesirable for reasons of standardization.

Another solution can be configured to increase the thickness of the first predamper guide washer. However, increasing the axial size of the first predamper guide washer is difficult because of the configuration between the guide washer of the predamper and the damper plate of the main damper.

It is an object of the present invention, in particular, to limit the axial deformation of the first predamper guide washer to which the elastic washer exerts a force.

To this end, the object of the present invention is a friction clutch for an automobile intended to combine two substantially coaxial rotational input and output elements of the type described in French Patent Publication No. 2 804 190, wherein the friction clutch for the automobile is a first. And means for contacting the central portion of the first guide washer with respect to the second guide washer.

Accordingly, the first guide washer supported on the second guide washer is not substantially deformed and does not come into contact with the damper plate, which may cause disturbing friction.

According to the optional features of the friction clutch,

The contact means comprises a substantially axial lug abutting against a substantially radial tooth on the second guide washer, fixed to the center of the first guide washer,

The damper plate is bounded by an inner contour provided with a radial recess allowing the passage of the contact lug of the first guide washer,

The friction means comprises a friction member that is elastically pressed against the central portion of the first guide washer by an axially acting elastic member,

The friction member is rotatably connected to the damper plate with a circumferential gap,

The damping means is arranged in the friction device of the clutch, the input element is formed by the friction disk and the output element is formed in particular by a hub intended to be coupled to the transmission input shaft,

The damping means form a predamper of the friction device,

The friction device further comprises a main damper, wherein the second guide washer of the predamper forms a damper plate of the main damper, the damper plate of the predamper and the main damper respectively having no circumferential gap and circumferential gap, Rotatably connected, the friction disk is fixed to the first guide washer of the main damper,

An elastic member acting in the axial direction is interposed between the friction washer and the guide washer of the main damper which the elastic member presses elastically,

The axially acting elastic member is rotatably connected to the guide washer on which the elastic member presses.

The invention will be better understood by looking at the following detailed description, which is provided by way of example only and with reference to the accompanying drawings.

1 and 2 show a friction clutch (denoted by reference numeral E as a whole) which is an example described for an automobile.

This friction clutch E comprises a friction device with damping means comprising a main damper A1 and a predamper A2. These dampers A1, A2 are mounted between a rotational input element, such as a friction disk 1, and a rotational output element, such as a cylindrical hub 2, for transmitting the rotational torque to a driven shaft, such as an input shaft of the transmission. The input and output elements are substantially coaxial.

In a known form, the friction disc 1 is intended to be gripped between an engine flywheel which is fixedly rotated together in a driven shaft, such as a crankshaft of an internal combustion engine, and a pressure plate actuated by coupling means. The hub 2 comprises a longitudinal internal flute for rotationally connecting the hub 2 together at the end of the driven shaft.

The main damper comprises two guide washers 3, 4 fixed to each other and rotatably mounted together on the hub 2 by each of the annular bearings 5, 6. The friction disc 1 is fixed to the first guide washer 3 by rivets 7.

The annular damper plate 8 (shown separately in FIG. 4) is arranged coaxially with them between the two guide washers 3, 4, and with a predetermined set of teeth on the outer periphery of the hub 2. The inner peripheral portion includes a set of interdigitated teeth having a circumferential gap. 4 shows the teeth D of the inner set on the damper plate 8 forming a substantially radial protrusion intended to cooperate with complementary outer recesses on the hub 2.

A circumferentially elastic member 9, such as a high rigid helical spring 9, is received in the window 10 in the guide washers 3, 4 and the window 11 in the annular damper plate 8. The elastic member 9 of the first group is accommodated in the above-described windows 10 and 11 without the circumferential gap, and transfers the rotational torque between the guide washers 3 and 4 and the damper plate 8 from the start of rotation. To get involved. The second group of elastic members 9 is accommodated in the window 10 in the guide washer without a circumferential gap and is received with a predetermined circumferential gap in the window 11 in the annular damper plate 8, and the guide washer. Rotation only if the respective movement between 3 and 4 and the annular damper plate 8 exceeds a predetermined value corresponding to the circumferential gap between the elastic member 9 and the window 11 of the damper plate 8. It is involved in the transmission of torque.

Accordingly, the elastic member 9 of the first group permanently transmits the torque, and the elastic member 9 of the second group causes the angular movement between the guide washers 3 and 4 and the annular damper plate 8 to be increased. The torque is transmitted only when it is larger than the predetermined value. Accordingly, damping of vibration and torque irregularities is achieved, and the second group of elastic members allows the respective motions between the guide washers 3 and 4 and the annular damper plate 8 to exceed the limit value as in the idle position. Only works.

The predamper A2 forms a connection between the annular damper plate 8 of the main damper and the hub 2. In figure 3 some elements of the predamper A2 can be seen.

This predamper A2 comprises a first and a second guide washer. The first guide washer of the predamper is a washer 12 (shown separately in FIG. 7) which is fixedly rotated together to the damper plate 8. This allows the guide washer 12 to rotate with the main damper plate 8 by fitting the outer lug P in the complementary notch C provided in the inner contour of the window 11 in the main damper plate 8. Because it is fixed (see FIGS. 3, 4 and 7). The lug P also forms an axial bracing element for the first and second guide washers of the predamper A2 by the cooperation of the damper plate 8 surface with these shoulders P. do. The second guide washer of the predamper is formed by the annular damper plate 8 itself.

The annular damper plate 13 of the predamper (shown separately in FIG. 5) is disposed between the annular damper plate 8 and the washer 12, for example by engaging an outer circumferential set of teeth on the hub 2. Are fixed to rotate together. FIG. 5 shows a notch 11 provided on the inner circumference of the damper plate 8 intended to cooperate with complementary outer teeth on the hub 2. Thus, the damper plate 13 of the predamper is rotatably connected together with the hub 2 without a circumferential gap.

A circumferentially elastic member 14, such as a helical spring having a relatively low stiffness, is provided with an annular damper plate 8 of the main damper for transmitting a rotational torque between the annular damper plate 8 and the hub 2, It is accommodated in the windows 8F, 12F, 13F in the washer 12 and the annular damper plate 13 of the predamper. In a form similar to the main damper, the elastic members 14 are classified into two groups. Accordingly, some elastic members 9 are mounted in the above-mentioned windows without circumferential clearance and are involved in the transmission of torque from the start of rotation, while the other elastic members 14 are annular damper plates 8 and guide washers. It is mounted in the windows 8F and 12F of (12) without the circumferential gap, and is mounted in the window 13F in the annular damper plate 13 of the predamper with a predetermined circumferential gap, and the damper plate 8 And, on the one hand, the guide washer 12 and, on the other hand, are involved in the transmission of the rotational torque only when the angular movement between the annular damper plate 13 of the predamper is larger than the aforementioned circumferential gap.

Thus, all the elastic members 9 and 14 cause damping of vibration and torque irregularities absorbed by the pre-damper and the main damper to four levels, and this damping level is gradually increased. This is because the elastic members 14 of the predamper A2 form two damping levels that vary depending on whether they are mounted with or without a circumferential gap in their corresponding windows. Moreover, at the end of the running of the main damper A1, the elastic members 9 of these dampers A1 form two additional damping levels which depend on whether they are mounted with or without a circumferential gap in their corresponding windows. do.

In order to damp the vibrations and irregularities absorbed by the elastic members 14, 9, friction means located between the guide washers 3, 4 of the main damper are engaged with the predamper A2 and the main damper A1. .

Regarding the predamper A2, the first friction means is formed by the bearings 5 and 6 that cooperate with the hub 2.

The bearing 6 for centering the guide washer 4 of the main damper comprises a truncated conical inner circumference which contacts on the truncated conical surface 15 of the hub 2. The bearing 6 comprises a finger 16 which extends parallel to the axis of rotation and is engaged in a corresponding orifice 16A in the guide washer 4 to connect the bearing 6 and the washer 4 together for rotation. do.

The bearing 5 of the first guide washer 3 is in axial contact with the shoulder 17 on the hub 2 formed by the radial end face of the outer tooth on the hub.

An elastic axial compression washer 18 is mounted in contact between the guide washer 3 and the bearing 5 to press the bearing 5 in contact with the frustoconical surface 15 of the hub 2. .

The elastic washer 18 is fixed to rotate with the bearing 5 by the cooperation of lugs and complementary notches.

In the embodiment shown, the bearings 5, 6 are made of fiber reinforced plastic material, if possible, and exert relatively moderate friction on the hub 2.

The second friction means combined with the predamper comprises an axial direction on the friction washer 19 disposed between the first guide washer 3 and the guide washer 12 of the predamper and the guide washer 12 of the predamper. The contact state includes an elastic axial compression washer 20 mounted in contact between the first guide washer 3 and the friction washer 19 to press the friction washer 19.

The friction washer 19 is pressed by the elastic washer 20 against the center of the guide washer 12 (ie radially inner).

The elastic washer 20 is fixedly rotated together to the guide washer 3 of the main damper by the cooperation of lugs and complementary notches.

In order to prevent any undesirable deformation of the washer 12, the first guide washer 12 of the predamper is relatively precisely perforated (see FIG. 7), and the predamper A2 is [damper plate 8 Axial lug T, which is a contact means for contacting the central portion of the first guide washer 12 with respect to the second guide washer of the predamper.

Preferably, as can be seen in particular in FIG. 3, the contact means T is in contact with the substantially radial teeth D of the second guide washer of the pre-damper (damper plate 8 of the main damper). In one state, it comprises a substantially axial lug T extending the inner contour of the central portion of the first guide washer 12.

5 and 6, the inner contour of the damper plate 13 of the predamper is defined by the separation sector of the notch N. Some such separating sectors have a radial recess G which allows the passage of the contact lug T of the first guide washer 12 of the predamper.

The friction washer 19 has a friction washer 19 and an end portion of the elastic member 14 which is mounted with a circumferential gap in the window 13F in the annular damper plate 13 of the predamper. Lugs (not shown) for rotationally connecting. Accordingly, the friction washer 19 is rotatably connected together to the damper plate 13 of the predamper with a circumferential gap. The angular movement between the damper plate 13 and the assembly formed by the damper plate 8 of the main damper and the guide washer 12 is in the circumferential gap of the elastic member 14 in the window in the damper plate 13. Only when the corresponding predetermined value is exceeded, the friction washer 19 rotates with the annular damper plate 13 of the predamper.

With regard to the main damper A1, the first friction means is firstly a friction washer disposed between the guide washer 3 of the main damper, secondly the first guide washer 12 and the damper plate 13 of the predamper. (22).

In order to first press the friction washer 22 to axially contact the guide washer 12 of the predamper and then to the damper plate 13 of the predamper, the elastic axial compression washer 23 is the main damper. Is mounted in contact between the guide washer 3 and the friction washer 22.

This is because the friction washer 22 is fixedly fixed to the guide washer 12 by fitting the lug 24 into the window 12F of the guide washer 12. The lug 24 is supported on the damper plate 13 of the predamper.

The elastic washer 23 is fixedly rotated together to the guide washer 3 of the main damper by the cooperation of lugs and complementary notches.

The second friction means of the main damper comprises a friction washer 25 arranged between the guide washer 4 of the main damper and the annular damper plate 13.

The friction washer 25 is together with the damper plate 8 of the main damper by fitting the peripheral lugs 26 in the complementary notches C provided in the inner contour of the window 11 of the damper plate 8 of the main damper. It is fixed to rotate.

Under the influence of the compressive force of the elastic washer 23 transmitted through the lug 24 and the damper plate 13, the friction washer 25 is driven between the friction washer 25 and the second guide washer 4. It is pressed in axial contact with the washer 28. This drive washer 28 cooperates with the damper plate 8 with a circumferential gap. This allows the lug 29 extending axially from the drive washer 28 to be fitted with a circumferential gap in the window 11 of the damper plate 8 which receives the elastic member 9 with a circumferential gap. Because.

Moreover, drive washer 28 is secured to rotate together with friction washer 30 by fitting the end of lug 29 to a complementary notch in such friction washer 30. This friction washer 30 is actuated elastically by an elastic axial compression washer 31 supported on the friction washer 30 and the first guide washer 3.

The elastic washer 31 is fixedly rotated together to the first guide washer 3 by the cooperation of lugs and complementary notches.

The function of the friction clutch E, in particular the continuation of the four damping levels, is described in general in French Patent Publication No. 2 804 190, for example. However, a specific form of the function of the friction clutch E shown in the figure will be described below.

In the tickover of the internal combustion engine coupled to the clutch E according to the invention, the main damper A1 behaves similarly to the rigid member because of the relatively high rigidity of the elastic member 9 and is supplied by the engine crankshaft. The rotated torque is transmitted directly by the friction disk 1 to the annular damper plate 8 of the main damper, which forms the input member of the predamper A2.

At the end of the operation of the second damping level of the predamper, the damper plate 13 of the predamper is first together with the damper plate 8 of the main damper, which forms the guide washer 12 of the predamper and the guide washer of the main damper. Rotationally secured, and secondly securely rotated together to the two friction washers 22, 25. In addition, the damper plate 13 of the predamper is fixed to the friction washer 19. For this reason, at the end of the movement of the predamper, friction between the friction washer 19 and the guide washer 12 is interrupted, while friction between the friction washer 19 and the elastic washer 20 is maintained. The blocked friction is firstly the friction between the friction washer 22 and the elastic washer 23, and secondly the driving washer cooperating with the friction washer 25 and the circumferential clearance with the damper plate 8 of the main damper. Replaced by friction between 28.

When the second damping level of the main damper is activated, the drive washer 28 moves with the damper plate 8 so that friction between the friction washer 25 and the drive washer 28 is blocked.

However, the blocked friction is first replaced by friction between the friction washer 30 and the elastic washer 31 and secondly between the drive washer 28 and the second guide washer 4.

The present invention is not limited to the embodiment described above. In particular, it may be provided, if necessary, with a main damper having means for contacting the center of the guide washer of the main damper with respect to the other guide washer of this main damper.

According to the friction clutch for automobile according to the present invention, it is possible to limit the axial deformation of the first pre-damper guide washer to which the elastic washer is pressed.

Claims (10)

Two second and first guiding washers 8, 12 fixedly rotatably fastened to the input element 1 or the output element 2, and rotatably fastened together to the output element 2 or the input element 1 The damper plate 13, the guide washer 8, 12 and the elastic member 14 acting in the circumferential direction accommodated in the windows 8F, 12F, 13F provided in the damper plate 13, and the first Two coaxial rotating input elements 1 and output elements 2 of the type comprising damping means A2 comprising friction means 19, 20 acting axially on the central part of the guide washer 12. In an automotive friction clutch intended to engage Means for contacting the central portion of the first guide washer 12 with respect to the second guide washer 8; Friction clutch. The method of claim 1, The contact means comprise an axial lug T, which is fixed to a central portion of the first guide washer 12 in contact with a radial tooth D on the second guide washer 8. doing Friction clutch. The method of claim 2, The damper plate 13 is characterized in that it is bounded by an inner contour provided with a radial recess allowing the passage of the axial lug T of the first guide washer. Friction clutch. 4. The method according to any one of claims 1 to 3, The friction means comprises a friction washer 19 which is elastically pressed against the central portion of the first guide washer 12 by an elastic washer 20 acting axially. Friction clutch. 5. The method of claim 4, The friction washer 19 has an end portion of the elastic member 14 mounted at its outer circumference with a friction washer 19 and a circumferential gap in the window 13F in the annular damper plate 13 of the predamper. A second lug for rotationally connecting together, wherein the friction washer 19 has a circumferential gap and is connected to the damper plate 13 to rotate together. Friction clutch. 4. The method according to any one of claims 1 to 3, The damping means is arranged in the friction device of the clutch, the input element being formed by a friction disc 1, the output element being formed by a hub 2 intended to be coupled to a transmission input shaft. doing Friction clutch. The method of claim 6, Said damping means forming a predamper A2 of said friction device. Friction clutch. The method of claim 7, wherein The friction device further comprises a main damper A1, the second guide washer 8 of the predamper A2 forms a damper plate of the main damper, and the damper plate 13 of the predamper A2. ) Is rotatably connected to the hub 2 together without a circumferential gap, and the damper plate 8 of the main damper is rotatably connected to the hub 2 with a circumferential gap, and the friction disk 1 ) Is fixed to the first guide washer (3) of the main damper Friction clutch. 9. The method of claim 8, The friction means comprises a friction washer 19 which is elastically pressed against the central portion of the first guide washer 12 by an elastic washer 20 acting in an axial direction, The elastic washer 20 acting in the axial direction is interposed between the guide washer 3 and the friction washer 19 of the main damper to which the elastic washer 20 elastically presses. Friction clutch. The method of claim 9, The elastic washer 20 is rotatably connected together to the guide washer 3 which the elastic washer 20 presses by the cooperation of a third lug and a complementary notch. Friction clutch.

Images