WO2014023303A1

WO2014023303A1 - Centrifugal-force pendulum and friction clutch with centrifugal-force pendulum

Info

Publication number: WO2014023303A1
Application number: PCT/DE2013/200066
Authority: WO
Inventors: Uli Junker
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2012-08-06
Filing date: 2013-07-18
Publication date: 2014-02-13
Also published as: DE102013214155A1; DE112013003910A5

Abstract

The invention relates to a centrifugal-force pendulum (10) for the speed-dependent torsional vibration damping of a torque transmission device, in particular of a friction clutch, having a plurality of pendulum weights (16), at least one guide device (14) which defines at least one guide plane, along which the pendulum weights (16) are guided movably on a respective track by means of at least one slotted guide (18), and damping elements (36) for impact damping of an impact of the respective pendulum weight (16) when the end positions on the track thereof are reached. It is provided that the damping elements (36) are arranged at circumferential ends of the pendulum weights (16) with regard to the rotational axis (34) of the centrifugal-force pendulum (10). Furthermore, the invention relates to a friction clutch with a corresponding centrifugal-force pendulum.

Description

Centrifugal pendulum and friction clutch with centrifugal pendulum

The invention relates to a centrifugal pendulum for speed-dependent torsional vibration damping of a torque transfer device, in particular a friction clutch, with several pendulum masses, with at least one guide device defining at least one guide plane along which the pendulum masses are movably guided by means of at least one slotted guide on a respective path, and with damping elements for Impact absorption of an impact of the respective pendulum mass when reaching the end positions on its path. The invention further relates to a friction clutch with a corresponding centrifugal pendulum.

From DE 10 2006 028 556 A1 a centrifugal pendulum for speed-dependent torsional vibration damping within a friction clutch is known. The centrifugal pendulum mass comprises a plurality of pendulum masses, at least one guide device defining a guide plane along which the pendulum masses are movably guided on a track by means of a slotted guide and the guide rollers, and damping elements for impact damping upon reaching the end position of the pendulum masses on their tracks. The guide device is designed as a central guide flange in the form of a circular disk whose flanks form the guide surfaces for the pendulum masses. The slide guide is formed by slide recesses in the guide flange and further slide recesses in the pendulum masses, in which the guide rollers can roll off or roll off. The pendulum masses are designed as two-piece pendulum masses whose sub-masses are connected to each other by means of stepped bolts. For this purpose, the stepped bolts pass through the guide flange by means of corresponding recesses which correspond to the slide recesses in the guide flange for the rollers. The damping elements are designed as sheaths of central portions of the stepped bolt. The middle sections are the sections of the stepped bolts which engage in the corresponding sliding recesses for the guide device. The respective sheath is made of an elastic, damping plastic material.

Due to the thickness of the shells, the recesses for the stepped bolts in the guide means designed as a guide means must be made relatively wide, which is unfavorable for the strength of the guide means.

It is the object of the invention, a centrifugal pendulum and a friction clutch with

To create centrifugal pendulum, in which the leadership is guaranteed safe and accurate and an impact noise when reaching the end stop of the web (a so-called stop noise) avoided or at least suppressed.

The object is achieved according to the invention by the features of claims 1 and 10. Preferred embodiments of the invention are specified in the subclaims, which individually or in combination may constitute an aspect of the invention.

In the centrifugal pendulum according to the invention it is provided that the damping elements are arranged with respect to the axis of rotation of the centrifugal pendulum pendulum ends of the pendulum masses. In this case, the damping element can interact with a stop element of the guide device or with a peripheral end of another pendulum mass for impact damping.

Due to the arrangement of the damping elements at the ends of the pendulum masses, the following advantages arise: Other types of damping elements, such as the known from the prior art shells of bolts of pendulum masses can be omitted. The damping elements according to the invention are mounted directly on the ends of the pendulum masses, which has the advantage that the pendulum masses are made particularly long and / or heavy, since they are damped in mutual striking by the damping elements. Stop noise is also effectively reduced since one pendulum mass in each case is "decelerated" by the pendulum mass lying next to it, and the small gap additionally favors this.

Preferably, one of the damping elements, particularly preferably each of the

Damping elements, an elastomeric material on. In this case, the damping element can also consist entirely of elastomeric material. The elastomeric material is especially rubber. The damping elements made of elastomeric material are preferably cast (e.g., by injection molding).

According to a preferred embodiment of the invention it is provided that one of the damping elements, particularly preferably each of the damping elements, is fastened in a material-locking and / or form-fitting manner to one of the peripheral ends of the respective pendulum mass. The cohesive attachment is preferably a vulcanization and / or a bond. Alternatively or additionally, the Dämfungselemente spring elements. These

Spring elements are attached as separate elements at the ends or formed by machining a pendulum mass blank in one piece with the pendulum mass at the circumferential end in). In other words, the respective pendulum ends themselves are made elastic, e.g. meandering laser / water jet cuts or the like are attached.

According to a further preferred embodiment of the invention, the pendulum masses are circumferentially distributed with respect to the axis of rotation of the centrifugal pendulum.

It is provided in particular that each of the pendulum masses has a damping element at exactly one circumferential end.

According to yet another preferred embodiment of the invention, the pendulum masses are made in two parts and the guide device is designed as a central guide flange, the lateral flanks each forms one of the guide planes along which the two-part pendulum masses are guided with its two masses on both sides of the guide flange. The pendulum masses correspond - except for the damping elements - essentially the pendulum masses of the centrifugal pendulum (FKP) shown in the above-mentioned document DE 10 2006 028 556 A1. However, it results from the damping elements at the ends of the pendulum masses, however, the advantage that the damping elements can be omitted in the flange or at least made much smaller.

It is particularly provided that in each of the two-part pendulum masses is attached to the one circumferential end of one of the damping elements on one part of the mass and at the other circumferential end of the damping elements on the other part mass.

Preferably, the slide guide is formed by Kulissenausnehmungen in the guide means and other Kulissenausnehmungen in the pendulum masses, the guide means take guide rollers for guiding the pendulum masses on their respective pendulum tracks.

The friction clutch according to the invention for coupling a drive shaft of a

Motor vehicle engine with at least one transmission input shaft comprises (a) a counterplate te, (b) a relatively displaceable to the counter-plate pressure plate for pressing a clutch disc between the counter-plate and the pressure plate and (c) at least one connected to the counter-plate and / or a clutch cover centrifugal pendulum, which is designed as above-mentioned centrifugal pendulum.

In general, the centrifugal pendulum can be attached to any rotatably mounted transmission element of the friction clutch. According to a preferred embodiment of the invention, the friction clutch on a flywheel, which encompasses the centrifugal pendulum or at least carries and further also forms the counter-plate.

Advantageously, it is provided that the flywheel is designed as a dual mass flywheel with a primary mass and a secondary mass. Preferably, the at least one centrifugal pendulum is attached to the secondary mass.

According to yet another preferred embodiment of the invention, the

Pendulum masses circumferentially distributed with respect to the axis of rotation of the friction clutch. If the centrifugal pendulum is carried by the flywheel, the pendulum masses are arranged circumferentially distributed on the flywheel.

The invention will now be described by way of example with reference to the accompanying drawings with reference to preferred embodiments, wherein the features shown below, both individually and in combination may represent an aspect of the invention. Show it:

1 is a side view of a centrifugal pendulum with guide flange and attached two-piece pendulum masses according to an embodiment of the invention,

2 shows a side view of a part of the guide flange with parts of one of

two-part pendulum masses of the centrifugal pendulum pendulum of Fig. 1,

3 shows an end region of a pendulum mass for a centrifugal pendulum of FIG. 1 according to a first embodiment, FIG.

4 shows an end region of a pendulum mass for a centrifugal pendulum of FIG. 1 according to a second embodiment, FIG. 5 shows an end region of a pendulum mass for a centrifugal pendulum of Fig. 1 according to a third embodiment,

Fig. 6 is a schematic sectional view through one of the two-piece pendulum masses of the centrifugal pendulum of Fig. 1 along the line Vl-Vl and

Fig. 7 is a schematic sectional view through a guide flange and several of the two-piece pendulum masses of the centrifugal pendulum of Fig. 1 along the line VII-VII.

Fig. 1 shows a centrifugal pendulum 10 for speed-dependent torsional vibration damping of a friction clutch or other torque transmitting device. The centrifugal pendulum 10 has a trained as a central guide flange 12 guide means 14 which carries a plurality of pendulum masses 16 of the centrifugal pendulum 10 and defines two parallel guide planes along which the pendulum masses 16 are movably guided by link guides 18 on respective (pendulum) paths. The central guide flange 12 has the shape of a circular disk and carries in the example shown in FIG. 1 four pendulum masses 16. The pendulum masses 16 are made in two parts and have two interconnected sub-masses 20, 22, but together only in Figures 6 and 7 shown are. In the side views of Figures 1 to 5 each only one of the two sub-masses 20, 22 visible.

The slotted guides 18 are formed by slide recesses 24 in the guide device 14 and further slide recesses 26 in the pendulum masses 16 in which guide rollers 28 of the slotted guide 18 can roll or roll. Per pendulum mass 16 two guide rollers 28 are provided. For each guide roller 28, there is a slide recess 24 in the guide device 14 and at least one further slide recess 16 in the respective pendulum mass 16. Each of the pendulum masses 16 has a contour in side view which approximately corresponds to a circular disk sector and two with respect to the axis of rotation 34 of the centrifugal pendulum 10 has circumferential ends 30, 32. The pendulum masses 16 are circumferentially distributed with respect to the axis of rotation 34 of the centrifugal pendulum 10, and the central axis of the circular disc, so that the peripheral ends 30, 32 of adjacent pendulum masses 16 are opposed to each other, but have a certain distance. Between the respective adjacent pendulum masses 16 thus forms a gap. Each of the pendulum masses 16 has a damping element 36 on at least one of the peripheral ends 30. This respective damping element 36 is a damping element for impact absorption of an impact of the respective pendulum mass 16 when reaching the end positions on their (pendulum) path. For this purpose, the damping element 36 cooperates with the respective other peripheral end 32 of the adjacent pendulum mass 16 and forms with the ends 30, 32 a respective end stop for the two adjacent pendulum masses 16. This has the advantage that the space is optimally utilized and the pendulum masses particularly can be tall and heavy. The damping elements 36 at the ends 30, 32 are the only damping elements for impact damping of the pendulum masses 16. There are no other damping elements for this purpose.

As an alternative to the arrangement described, in which two circumferential ends 30, 32 of different pendulum masses 16, by means of arranged at one of the ends 30, 32 / fastened / formed damping element 36 form the end stop, the respective pendulum mass 16 with the damping element 36 in principle, of course cooperate with an end stop structure of the guide device 14.

The damping elements 36 of Figures 1 to 4, 6 and 7 are damping elements made of an elastomeric material, such as rubber. When centrifugal pendulum 10 of FIG. 1, the damping elements 36 are, for example, firmly bonded to the respective peripheral ends 30 of the pendulum masses 16. For this purpose, the damping elements 36 are attached by means of vulcanization and / or gluing at the end 30.

The two sub-masses 20, 22 of the two-part pendulum masses 16 are connected to each other by means of connecting bolts 40. In the example shown, three connecting bolts 40 per pendulum mass 16 are provided. The connection by means of the bolts 40 is preferably a riveted joint. The connecting bolts 40 are accordingly rivet bolts.

Fig. 2 shows a part of the guide flange 14 formed as a guide device 14 with parts of the attached two-piece pendulum mass 16. The arranged in front of the guide flange 12 part mass 20 is removed and gives the view free on the guide rollers 28, sections of the behind the guide flange 12th lying partial mass 22, the connecting pin 40 for connecting the two sub-masses 20, 22 and the Kulissenausnehmun- gene 24, 26 for the rollers 28 and corresponding recesses 42 for the connecting pin 40. Similar to the rollers 28 namely pass through the bolts 40 the guide flange 12th through the corresponding recesses 42. In the bolt 40 no elastic sheath is provided, because the damping elements are yes to at least one the ends 30, 32 of the respective pendulum mass provided. This allows the corresponding recesses 42 (compared to the situation described in the prior art in the prior art) to be narrow, which increases the flange strength of the guide flange 12.

FIGS. 3 to 5 each show a peripheral end 30, 32 of a pendulum mass 16 (or a circumferential end of a partial mass 20, 22) with a damping element 36 disposed thereon in detail. In addition to the end 30, 32 with the damping element 36 and the damping element 36 itself, a bolt 40 and a part of the edge of the further ball recess 26 can be seen.

The damping element 36 of FIG. 3 is positively secured (and optionally also materially bonded) to the corresponding end 30, 32. The damping element 36 of FIG. 4 is firmly bonded to the corresponding end 30, 32 and formed as an elastic cap. The damping element 36 of FIG. 5 is designed as a spring element 38 and integrally formed at the end 30, 32. In other words, the pendulum end 30, 32 is itself elasticized by e.g. meandering laser / water jet cuts or the like are attached.

Fig. 6 shows a schematic sectional view through one of the two-piece pendulum masses 16 of the centrifugal pendulum 10 along in Fig. 1 (as a dash-dot line) drawn section line Vl-Vl. The corresponding slide recesses 26 and the connecting pins 40 are not shown. In this two-piece pendulum mass 16 with partial masses 20, 22, a first damping element 36 is attached to the one partial mass 20 at the one circumferential end 30 and a second damping element 36 is attached to the other partial mass 22 at the other peripheral end 32.

Fig. 7 shows a schematic sectional view through the guide flange 12 and three of the four two-piece pendulum masses 16 of the centrifugal pendulum 10 of FIG. 1 along the (dashed line) drawn section line VII-VII. The corresponding recesses 24, 26 and 42 and the connecting pin 40th are not shown. The two connected by means of bolts 40, in particular riveted, sub-masses 20, 22 are symmetrical or balanced, since they are always mutually arranged. In principle, however, the damping elements 36 can also be attached to both pendulum ends 30, 32 of each partial mass 20, 22 of a pendulum mass 16 (not shown). There are the following advantages over the prior art:

The elastic sheathing of the bolts required in the prior art is eliminated.

Instead, the damping elements 36 are attached directly to at least one of the circumferential ends 30, 32. First, it has the advantage that the recesses 42 in the

Flange 12 can be made substantially smaller and secondly, the pendulum masses 16 can be made longer and / or heavier, since they are attenuated in mutual striking by the damping elements 36. Stop noises are also effectively reduced since one of the pendulum masses 16 is "decelerated" by one of the circumferentially adjacent pendulum masses 16. The respective small gap between the ends 30, 32 of the adjacent pendulum masses 16 additionally favors this.

Such a centrifugal pendulum 10 is suitable for use in a torque transmission device, in particular in a friction clutch. Such torque transmission devices are used for example in the drive train of vehicles, especially motor vehicles. In a friction clutch for coupling a drive shaft of an automotive engine with at least one transmission input shaft, this preferably has the following components: (i) a counterplate, (ii) a pressure plate displaceable relative to the counterplate for pressing a clutch disc between the counterplate and the pressure plate, and (iii) at least one associated with the counter-plate and / or a clutch cover centrifugal pendulum 10th

List of accessories for centrifugal pendulum

guide flange

guide means

pendulum mass

link guide

partial mass

Kulissenausnehmung

leadership

The End

axis of rotation

damping element

spring element

connecting bolts

recess

Claims

claims

1 . Centrifugal pendulum (10) for the speed-dependent torsional vibration damping of a torque transmission device, in particular a friction clutch, with

several pendulum masses (16),

at least one guide device (14), which defines at least one guide plane along which the pendulum masses (16) by means of at least one slide guide (18) are movably guided on a respective path, and

Damping elements (36) for impact damping of an impact of the respective pendulum mass (16) on reaching the end positions on its path,

characterized in that

the damping elements (36) are arranged with respect to the axis of rotation (34) of the centrifugal force pendulum (10) circumferential ends (30, 32) of the pendulum masses (16).

2. centrifugal pendulum according to claim 1, characterized in that the damping elements (36) each comprise elastomeric material.

3. centrifugal pendulum according to claim 1 or 2, characterized in that the damping elements (36) are cohesively and / or positively attached to the respective peripheral ends (30,32) of the respective pendulum masses (16).

4. centrifugal pendulum according to one of claims 1 to 3, characterized in that the Dämfungselemente (36) spring elements (38).

5. centrifugal pendulum according to one of claims 1 to 4, characterized in that the pendulum masses (16) with respect to the axis of rotation (34) of the centrifugal pendulum (10) are distributed circumferentially.

6. centrifugal pendulum according to one of claims 1 to 5, characterized in that each of the pendulum masses (16) at exactly one of its peripheral ends (30; 32) has a damping element (36).

7. centrifugal pendulum according to one of claims 1 to 6, characterized in that the pendulum masses (16) are designed in two parts and the guide means (14) as a central guide flange (14) is formed, the lateral edges each forms one of the guide planes, along the two-part pendulum masses (14) with its two sub-masses (20, 22) are guided on both sides of the guide flange (14).

8. centrifugal pendulum according to claim 7, characterized in that in each of the two-part pendulum masses (20, 22) at one circumferential end (30, 32) of the Dämp- fixing elements (36) on the one part mass (20) and on the other circumferential end (32) of one of the damping elements on the other part mass (22) is attached.

9. centrifugal pendulum according to one of claims 1 to 8, characterized in that the at least one slotted guide (18) by Kulissenausnehmungen (24) in the guide means (14) and further Kulissenausnehmungen (26) in the pendulum masses (16) is formed, wherein the Sliding recesses (24, 26) receive guide rollers (28) for guiding the pendulum masses (16) on their respective tracks.

10. Friction clutch for coupling a drive shaft of an automotive engine with at least one transmission input shaft, with

a counter-plate,

a displaceable relative to the counter-plate pressure plate for pressing a clutch disc between the counter-plate and the pressure plate and

at least one associated with the counter-plate and / or a clutch cover centrifugal pendulum (10) according to one of claims 1 to 9.