DE102018101728A1 - Clutch mechanism, in particular for a motor vehicle - Google Patents

Abstract

The invention relates to a clutch mechanism (1), in particular for a motor vehicle, comprising a cover (2), a pressure plate (3) movable relative to the cover (2) along an axis of the mechanism, a movable between an engaged position and a disengaged position Diaphragm spring (12) adapted to cause the movement of the pressure plate (3), wear adjusting means interposed between the diaphragm spring (12) and the pressure plate (3).

Description

The present invention relates to a clutch mechanism with wear adjustment, in particular for a motor vehicle.

A coupling device conventionally comprises a reaction plate, a clutch mechanism containing a movable pressure plate, and a friction disc mounted between the reaction and pressure plates. The movement of the pressure plate is controlled by a diaphragm spring, which itself is controlled by a coupling stop.

The coupling stop may be of the electronic computer or hydraulic control or cable control type, to exert a predetermined force on the diaphragm spring and move it to a disengaged position.

The pressure plate is thus movable between an engaged position in which the friction disc is clamped between the pressure and reaction plates, and a disengaged position in which the friction disc is released.

The use of the coupling device leads to wear of the linings of the friction disk and the counter materials of the associated pressure and reaction plates. This manifests itself in a change in the position of the pressure plate relative to the associated diaphragm spring and / or relative to the reaction plate, which results in a change in the friction plate friction force and a change in the grinding point and stroke of the clutch stop. It should be noted that the grinding point is the position from which torque can be transmitted via the coupling device.

A clutch device with wear adjustment is from the document FR 2 847 626 in the name of the Applicant. This document discloses a wear adjustment adjuster for a motor vehicle, comprising a pressure plate intended to abut a friction disc of the coupling device, a diaphragm spring adapted to actuate the pressure plate between a fully engaged position in which the pressure plate bears against the pressure plate Friction disc is pushed, and a fully disengaged position in which the pressure plate is removed from the friction disc by means of return means of the pressure plate is used.

The pressure plate, the friction disc and the diaphragm spring are arranged in a lid that is fixed relative to the reaction plate.

The apparatus further comprises a frictional wear adjustment element interposed between the diaphragm spring and the pressure plate and movable in rotation about an axis in a predetermined range, the adjustment element comprising a ramp cooperating with a counter ramp adjacent to the pressure plate is adapted to adjust the distance between the diaphragm spring and the pressure plate and to compensate for the wear of the friction disc depending on the position of the ramp with respect to the counter ramp.

The coupling device further comprises moving means comprising a ratchet wheel adapted to rotate about an axis mounted on a cassette but entirely supported by the lid in the region of the ends of the axis. The moving means also include a latch having a body mounted on the lid and an actuating pawl cooperating with the ratchet wheel to effect rotation of the ratchet wheel in the event of wear. The ratchet wheel is coupled in rotation with a worm mounted about the aforesaid axis and engaged with a toothing of the adjuster member.

Thus, the rotation of the ratchet wheel causes the adjustment member to move to compensate for the wear.

The cassette conventionally includes a base and positioning jaws between which the toothed portion of the ramp means is mounted to assure the axial retention of the ramp means.

In general, the lid is made by deep drawing a sheet of steel. The axle is conventionally engaged in a hole of the cover, the end or ends of the hole being partially closed by local deformation of the material, for example by notching. The axle is held in position relative to the cover.

The invention proposes an alternative which makes it possible to ensure the axial holding function of the ramp means.

• - einen Deckel,
• - eine in Bezug zum Deckel entlang einer Achse des Mechanismus bewegliche Druckplatte,
• - eine zwischen einer eingerückten Position und einer ausgerückten Position bewegliche Membranfeder, die geeignet ist, die Bewegung der Druckplatte zu bewirken, Mittel zur Verschleißnachstellung, die zwischen der Membranfeder und der Druckplatte zwischengefügt sind, wobei die besagten Nachstellungsmittel Rampenmittel umfassen, die mit Gegenrampenmitteln zusammenwirken, so dass die Drehung der Rampenmittel in Bezug zu den Gegenrampenmitteln um eine Achse den Abstand zwischen der Membranfeder und der Druckplatte verändert, und Drehantriebsmittel der Rampenmittel, die zumindest teilweise um eine Achse montiert sind, wobei die besagte Achse von dem Deckel getragen wird, dadurch gekennzeichnet, dass die Rampenmittel einen sich radial erstreckenden Teil umfassen, der axial in einer in dem Deckel vorgesehenen Rille gehalten ist.

For this purpose, it proposes a clutch mechanism, in particular for a motor vehicle, comprising:

• - a lid,
• a pressure plate movable relative to the cover along an axis of the mechanism,
• a movable between an engaged position and a disengaged position A diaphragm spring adapted to effect movement of the pressure plate, wear adjustment means interposed between the diaphragm spring and the pressure plate, said adjustment means comprising ramp means cooperating with counter-ramp means such that rotation of the ramp means relative to the counter-ramp means about an axis changing the distance between the diaphragm spring and the pressure plate, and rotational drive means of the ramp means at least partially mounted about an axis, said axis being carried by the lid, characterized in that the ramp means comprise a radially extending part, which is held axially in a groove provided in the lid.

The lid thus ensures directly the axial holding function of the ramp means. The coupling mechanism can thus be without a cassette.

Since the mechanism has no cassette, the dangers of rotation of the latter are avoided. Consequently, it is now possible to reduce the axial preload applied by the tooth sector.

This reduces the number of components of the mechanism, which makes it possible to reduce costs.

The ramp means may comprise a tooth sector extending radially, the rotary drive means comprising a worm engaging the sector of teeth, the sector of teeth being engaged in the groove of the lid to axially hold the ramp means relative to the lid.

The moving means may include a ratchet wheel adapted to rotate about the axis, the worm being coupled in rotation with the ratchet wheel, and a detent pawl having a body mounted on the lid and an actuating pawl cooperating with the ratchet wheel rotation of the ratchet wheel in the event of wear, wherein rotation of the ratchet wheel results in movement of the ramp means to compensate for wear.

The cover may have an annular portion extending radially and at least a first pin and a second pin extending axially from the annular radial portion, the pins being circumferentially offset with respect to one another, the axis being the rotary drive means carries a first end engaged in a hole of the first bolt and a second end engaged in a hole of the second bolt.

The first bolt and / or the second bolt may include a radially inner groove with the radial portion of the ramp means engaged in this groove.

The worm may be adapted to be supported on a support surface of one of the bolts for direct support or mediation of a friction member, the ratchet wheel being adapted to be supported on a support surface of the other bolt by means of biasing means such as a screw compression spring.

It should be noted that in the prior art the use of a cassette can cause a change in the frictional torque between the worm and the corresponding flank of the cassette to which the worm is intended to be supported. This change in the friction torque can have several causes.

The conventionally used screw compression spring tends to remove the opposite flanks of the cartridge from each other. Such removal is made possible by the mounting clearance between the flanks of the cassette and the lid. This distance tends to change the geometry and contact area between the screw and the cassette, with the result that the resulting friction torque is changed.

In addition, poorly distributed contact can cause premature wear of the cartridge and / or worm. Such wear has particular consequences for the lubrication in the region of these contact zones, whereby the friction torque between the worm and the cassette is significantly changed here.

According to the invention, the worm can come to rest on a special surface of the lid without requiring a cassette. Thus, the aforementioned problems are avoided.

The axle can be held in the holes of the bolts by holding means such as a screw or a pin.

Currently, there is a tendency to increase the torque to be transmitted through the coupling device without, however, increasing the footprint of the latter.

For this purpose, the invention can thus provide for replacing the cover made of steel, which is usually used, by a lid made of cast iron, for example cast aluminum alloy or cast a carbon alloy. The lid can be made by molding.

The width of the groove may be between 1 and 1.3 times the thickness of the tooth sector.

The bolts can be angularly separated by an angle between 15 ° and 30 °.

The invention also relates to a device comprising a coupling mechanism of the aforementioned type, characterized in that it comprises a reaction plate, wherein a friction disc is adapted to be clamped between the pressure plate and the reaction plate in the engaged position, and released in the disengaged position, wherein the lid is fixed relative to the reaction plate.

• - 1 eine Vorderansicht eines Kupplungsmechanismus nach einer Ausführungsart der Erfindung ist,
• - 2 eine Schnittansicht entlang der Linie II-II aus 1 ist,
• - 3 eine Schnittansicht entlang der Linie III-III aus 1 ist,
• - 4 ein auseinandergezogener Perspektivschnitt eines Teils des Kupplungsmechanismus ist,
• - 5 eine perspektivische Ansicht eines Teils des Kupplungsmechanismus ist,
• - 6 eine Schnittansicht entlang der Linie VI-VI aus 1 ist, die eine erste Ausführungsart der Erfindung darstellt,
• - 7 eine Ansicht entsprechend 6 ist, die eine zweite Ausführungsart der Erfindung darstellt,
• - 8 eine Ansicht entsprechend 6 ist, die eine dritte Ausführungsart der Erfindung darstellt,
• - 9 eine Ansicht entsprechend 6 ist, die eine vierte Ausführungsart der Erfindung darstellt.

The invention will be better understood and further details, features and advantages of the invention will become apparent from the study of the following description, given by way of non-limitative example with reference to the accompanying drawings, in which:

• - 1 is a front view of a coupling mechanism according to an embodiment of the invention,
• - 2 a sectional view taken along the line II-II 1 is
• - 3 a sectional view taken along the line III-III 1 is
• - 4 is an exploded perspective view of a part of the clutch mechanism,
• - 5 is a perspective view of a part of the coupling mechanism,
• - 6 a sectional view taken along the line VI-VI 1 is that represents a first embodiment of the invention,
• - 7 a view accordingly 6 Fig. 12 is a second embodiment of the invention,
• - 8th a view accordingly 6 Figure 3 is a third embodiment of the invention.
• - 9 a view accordingly 6 Figure 4 is a fourth embodiment of the invention.

The 1 to 6 make a clutch mechanism 1 with wear adjustment according to a first embodiment of the invention. This comprises a fixed annular cover 2 with an axis X which is intended to be mounted on a reaction plate (not shown), an annular and along the axis X with respect to the reaction plate and the lid 2 movable pressure plate 3 , A friction disc (not shown) is intended to be axially between the pressure plate 3 and the reaction plate to be interposed.

More specifically, the cover includes 2 an annular part 4 which extends globally radially, and bolts 5a . 5b extending axially from the radially outer periphery of the radial part 4 extend. The free ends of the bolts 5b are on the reaction plate, for example, by riveting or screwing by means of holes 6b that in the bolt 5b are provided attached. The lid 2 includes, for example, six fastening bolts 5b ,

The lid 2 also includes three centering bolts 5a , which are distributed by 120 ° and with the help of holes 6a on pins (not shown) of the reaction plate are plugged.

The bolts are angled away from each other by an angle between 15 ° and 30 °, the angle being in the region of the axes of the holes 6a and 6b is measured.

The lid 2 is cast, for example cast from an aluminum alloy or cast from a carbon alloy, and is manufactured by molding. As a variant, not shown, the lid may be made in the mass of a machined steel block or by deep drawing a steel sheet.

The printing plate 3 is radially inside the bolt 5a . 5b arranged.

A diaphragm spring 7 is radially inside the bolt 5a and 5b mounted, with the diaphragm spring 7 a deformable annular part 8th in the manner of a diaphragm spring, from which actuating finger 9 extend radially inward. The radially inner periphery of the fingers 9 is suitable to cooperate with a coupling stop, as is known per se. The diaphragm spring 7 is on the lid 2 in the area of support zones 10, which are on one with the lid 2 connected sheet metal 10 ' ( 2 . 3 ) are mounted, supported and mounted on the zones 10 under the intermediary of hooks 11 on the lid 2 with the help of rivets 12 ( 2 ), supported supported. The rivets 12 also ensure the attachment of the sheet 10 ' on the lid 2 ,

The diaphragm spring 7 serves to actuate the pressure plate 3 between a fully engaged position in which the pressure plate 3 is pushed to the reaction plate to clamp the friction disc between the plates, and a disengaged position in which the pressure plate 3 from the reaction plate to release the friction disk. For this purpose connect elastic tabs 13 which are suitable for an axial force exercise the lid 2 and the pressure plate 3 , The tabs 13 are provided so that they the pressure plate 3 elastically return to its disengaged position.

Wear adjustment means are axially between the pressure plate 3 and the diaphragm spring 7 interposed. More precisely, the diaphragm spring acts 7 with the wear adjustment means in a zone that extends radially outward of the support zones 10 the diaphragm spring 7 on the lid 2 located.

These means comprise a movable adjustment element 14 which is available in the form of a ring and an end 15 has, against which the diaphragm spring 7 is adapted to come to the support, and one end, the at least one circumferentially extending ramp 16 that has an associated counter ramp 17 interacts directly on the printing plate 3 ( 2 ) is provided.

For example, the angle is each ramp 16 of the adjustment element and the associated counter ramp 17 the printing plate 3 between 2 and 12 °. How better in 5 As can be seen, the adjustment element 14 comprises a tooth sector 18 forming a rack extending in the circumferential direction and adapted to cooperate with movement means to be driven in the event of wear of the friction disk in rotation about the axis X.

The moving means comprise a screw 19 that with the rack 18 is kept in engagement. The snail 19 is in rotation with a ratchet wheel 20 coupled with a latch 21 cooperates, which is an actuating claw 22 includes ( 2 ), whose free end with the ratchet wheel 20 engages, and in which the operation of the free end is caused by the wear of the friction disc.

The position of the ratchet wheel 20 in relation to the free end of the claw 22 the latch 21 varies depending on the wear of the friction disk and the position of the pressure plate 3 so that the latch 21 is suitable, the ratchet wheel 20 in the case of wear of the friction disc by movement of the pressure plate 3 between their engaged and disengaged position as known per se. The rotation of the ratchet wheel 20 thus leads to the rotational movement of the adjusting element 14 and thus due to the presence of the ramp 16 and the counter ramp 17 to a change in the axial distance between the support zone 15 and the printing plate 3 , This change in distance makes it possible to compensate for the wear of the friction disc in case of need.

The latch 21 is on the lid 2 in the inner volume of the lid 2 under the mediation of the rivet 12 attached. A window or a recess 23 ( 2 ) can in the lid 2 provided sin to the movement of the latch 21 to enable, as is known per se.

The ratchet wheel 20 and the snail 19 are rotatable about an axis 24 mounted between two bolts 5a . 5b of the lid 2 is mounted.

Bolts 5a and 5b used for mounting the axle 24 serve, each include a groove 25 of general circular arc shape with an axis X ( 4 ). The dental sector 18 is in each of the grooves 25 engaged in relation to the lid 2 to be held axially. The axial position of the adjustment element 14 is thus controlled to ensure the proper functioning of the wear adjustment means.

The width of the groove may be between 1 and 1.3 times the thickness of the tooth sector.

How better in 6 can be seen is a first end 24a the axis 24 in a hole 26a of the bolt 5a engaged, with a second end 24b the axis 24 in a hole 26b of the bolt 5b is engaged.

The hole 26a is continuous and traverses the bolt 5a full length in the circumferential direction. The hole 26b is blind. After mounting the axle 24 in the aforementioned holes 26a . 26b the bolt 5a . 5b For example, the hole 26a may be closed at least partially by material displacement or deformation 27. The axis 24 gets so in the holes 26a . 26b held. Such material deformation can be obtained when the lid 2 is made with the help of cast material with a sufficient ductility.

Moreover, the snail 19 suitable on a flat surface 28b of the bolt 5a to get support, with the area 28b extends axially. This support can be direct or realized by means of a ring which serves to control the friction. The ratchet wheel 20 is axially supported and in rotation with the worm 19 coupled. An elastic element 29 , here a helical compression spring, is between the ratchet wheel 20 and a flat surface 28a of the bolt 5a mounted, taking the area 28a extends axially. The elastic member 29 exerts a bias of the ratchet wheel 20 on the bolt 5a out.

7 represents a second embodiment, which differs from that with reference to 6 illustrated by distinguishing that the end 24a the axis 24 includes a knurl and stuck in the hole 26a of the bolt 5a engaged in holding the axle 24 to ensure in position.

8th represents a third embodiment, which differs from that with reference to 6 illustrated differs in that the hole 26b of the bolt 5b in the hole 6b empties. The axis 24 will be in the area of their end 24b through a screw 30 held in position in the hole 6b is engaged and fixing the lid 2 on the reaction plate, and in the area of its end 24a through a pen 31 in the hole 6a is engaged and centering the lid 2 relative to the reaction plate.

9 represents a third embodiment, which differs from that with reference to 8th illustrated differs in that the hole 26b is blind and not in the hole 6b empties. The axis 24 is thus between the bottom of the blind hole 26b and the pen 31 kept in position.

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

• FR 2847626 [0006]

Claims (10)

Clutch mechanism (1), in particular for a motor vehicle, comprising: - a cover (2), - a pressure plate (3) movable relative to the cover (2) along an axis of the mechanism, - a movable between an engaged position and a disengaged position Diaphragm spring (12) adapted to effect movement of the pressure plate (3), wear adjustment means interposed between the diaphragm spring (12) and the pressure plate (3), the adjustment means comprising ramp means (14, 16), cooperating with counter-ramp means (3, 17) such that rotation of the ramp means relative to the counter-ramp means about an axis (X) varies the distance between the diaphragm spring (12) and the pressure plate (3) and rotational drive means of the ramp means, at least partially mounted about an axis (24), the axis (24) being carried by the lid (2), the ramp means (14) comprising a tooth sector (18) extending radially, the rotary drive means comprising a worm (19) engaging the sector gear (18), characterized in that the sector gear (18) is engaged in a groove (25) provided in the cover (2), to hold the ramp means (14) axially relative to the lid (2). Clutch mechanism (1) after Claim 1 characterized in that said moving means comprise a ratchet wheel (20) adapted to rotate about said axis (24), said worm (19) being coupled in rotation with said ratchet wheel (20), and a latch (21), which comprises a body mounted on the lid (2) and an actuating pawl (22) which cooperates with the ratchet wheel (20) to cause the ratchet wheel (20) to rotate in case of wear, the rotation of the ratchet wheel (20) Ratchet wheel (20) for moving the ramp means (14) leads to compensate for the wear. Clutch mechanism (1) after Claim 1 or 2 characterized in that the lid (2) comprises an annular part (4) extending radially and at least one first pin (5a) and a second pin (5b) extending axially from the radial annular part (4) with the bolts (5a, 5b) circumferentially offset from each other, the axle (24) carrying the rotary drive means having a first end (24a) formed in a hole (26a) of the first bolt (5a) in FIG Is engaged, and a second end (24b) which is in a hole (26b) of the second bolt (5b) is engaged comprises. Clutch mechanism (1) after Claim 3 characterized in that the first bolt (5a) and / or the second bolt (5b) comprise a radially inner groove (25), the radial part (18) of the ramp means (14) in the groove (25) being engaged , Clutch mechanism (1) after Claim 3 or 4 characterized in that the worm (19) is adapted to come to rest directly or by means of a friction element on a support surface (28b) of one (5b) of the bolts, the ratchet wheel (20) being suitable, by means of biasing means, For example, a screw compression spring (29), on a support surface (28 a) of the other bolt (5 a) to reach for support. Clutch mechanism (1) according to one of Claims 3 to 5 , characterized in that the axis (24) in the holes (26a, 26b) of the bolts (5a, 5b) is held by retaining means, such as a screw (30) or a pin (31). Clutch mechanism (1) according to one of Claims 1 to 6 , characterized in that the cover (2) is cast, for example cast from an aluminum alloy or cast from a carbon alloy. Clutch mechanism (1) according to one of Claims 1 to 7 , characterized in that the width of the groove (25) is between 1 and 1.3 times the thickness of the toothed sector (18). Clutch mechanism (1) according to one of Claims 4 to 8th , characterized in that the bolts (5a, 5b) are angularly separated by an angle between 15 ° and 30 °. Device comprising a coupling mechanism (1) according to one of Claims 1 to 9 characterized in that it comprises a reaction plate, the friction plate being adapted to be clamped between the pressure plate (3) and the reaction plate in the engaged position and released in the disengaged position, the lid (2) being relative to the reaction plate is fixed.

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