FR2765293A1 - INERTIA MASS DEVICE FOR CLUTCHES ON MOTOR VEHICLES - Google Patents

Abstract

Inertia mass device for clutches on motor vehicles, characterized in that the clamping device (70) of the fastening means (5) is provided with a number of clamping tongues (60) which s' extend in the direction of the fixing means (5) and surround the latter in the form of a ring.

Description

I

Description

  The invention relates to an inertial mass device, in particular for clutches of vehicles with

  motor with at least one mass of inertia which can be

  rotational drag about an axis of rotation which has at least one recess for a fixing means serving to connect it integrally to a drive mechanism, fixing means with which a safety piece is associated

  against losses which has a clamping device

  as the fixing means against any exit from the recess-

  clamping device which, upon the action of a force which can be determined beforehand, compressing the fixing means in the direction of its extent, can be widened by deformation to an extent such that, as soon as the fixing means has taken a determined position relative to it, exerts a clamping action on the fixing means because

  a restoring force acting in the opposite direction of the deformation

  tion, clamping action by which this fastening means can be kept in this position until exceeded

  of a limit pressure operating in the direction of its extension-

  is lying. Document DE 195 45 629 C1 discloses a

  inertial mass device with a first inertial mass

  tie which can be rotated around an axis of

  rotation and with second mass of inertia which can fall

  bend with respect to the first on a limited rotation angle

  mite, second mass of inertia which is linked to the

  first mass of inertia by means of a damping device

  torsion. The first mass of inertia has a certain number of recesses, for a fixing means which

  serves to connect it securely to a drive mechanism

  such as the crankshaft of a combustion engine

  internal tion, fixing means with which a part is associated

  security against losses which to fulfill its pre-

  feels a clamping device of the fixing means. The dis-

  positive clamping is for example formed according to Figure 2 by a funnel-shaped element which, after driving in a fixing means is enlarged under the action of a force

  axial which compresses it towards the drive mechanism

  drag in a way you can predetermine by

  forming to such an extent that this element exerts a clamping action on the fixing means due to an antagonistic force acting in the opposite direction to the deformation, clamping action by which it is possible to maintain this

  fixing means in this position until

  past a limit load operating in the direction of its extent.

  The clamping devices according to the other embodiments of the document put to the public inspection are constituted even stronger than the clamping device.

  tightening shown in figure 2, in an extremely com-

  pact in the axial direction of the inertial mass device and

  consequently they operate essentially in the direction of

  dial. This has the consequence that to have a full blocking

  effective fixing means the radial force which is exerted on it by the clamping device must be

  relatively high, so that the clamping device

  rage can in the worst case be buried radia-

  LEMENT in the fixing means. This means that

  to introduce the fixing means into the corresponding recess

  laying when the fastening means is detached from the device

  tightening force must be applied unintentionally high

  vees, at least when, as described above, the clamping device is buried radially in the means

of fixation.

  The object of the invention is to constitute a provision

  mass inertia with a security piece against

  the losses for the fixing means which is provided on a metal

  drive mechanism, so that on the one hand the

  means of attachment is protected against loss with securing

  sufficient curiosity and on the other hand, however, allows a pas-

  wise of the fixing means with an energy expenditure

relatively small.

  This problem is solved by the fact that the provision

  clamping device of the fastening means is provided with a number of clamping tabs which extend in the direction

  fixing means and surround it in the form of a ring.

  By constituting the clamping device of the means

  blocking against loss with a number of tabs

  tightening tes extending in the direction of respectively

  fixing means, tabs which surround the fixing means

  In the form of a ring, elements are provided which, owing to their relatively long extent in the direction of travel of the fastening means, exhibit a considerable path of deformation and can therefore be adjusted on the one hand so that they engage elastically

  on the outer periphery of the fixing means, and blocks this-

  him this way against any loss on the other hand can

  wind however deviate without problem radially outward when the fastening means is pushed into its area of action, so that the penetration of the fastening means into the clamping device can take place with expense low axial energy. This is in particular advantageous when the clamping tongues are provided at one end on a fixing ring which makes it possible to connect a certain number of clamping devices to a mass inertia device and at the same time allows that the

  clamping tabs are free at their opposite ends

  so that these ends of the lans

  clamping points can redo the largest paths in the radial direction for a spacing movement when the depression of a fastening means. In a way

  corresponding the free ends of the tongues

  are therefore suitable for applying a radial force to the outer periphery of the fastening means, at least when they are provided in this area with a section

  approach with respect to the longitudinal axis of the fixing means

  tion, this approach section being constituted for example

  in the form of an oblique part of this area of the tongues-

  tightening in the direction of said longitudinal axis. The possibility

  advantageous bility of using the fixing means can in particular be accompanied, when the clamping tongues are formed at their ends of sockets from behind, of a very high security against losses for the fixing means, it being noted that for this type of achievement we have the

  possibility of driving in the fixing means before putting it on

  be in the inertial mass device individually in the clamping device which is respectively associated with it from the side of the fixing ring, until the fixing means on the one hand come to bear axia - Also on the sockets from behind and on the other hand are held in this axial position by the radial approach sections. Thus, the fixing ring can be mounted on the inertia mass device, which can be done in a conventional manner, thanks to the fact that the ring

  fixing has recesses for the fixing elements

  tion, such as for example screws or rivets which are placed in a corresponding part of the inertia mass. Likewise, the fixing ring can also however be fixed by means of a shape engagement connection to the inertia mass, by providing for example that one of the elements composed of the fixing ring and the mass of inertia be provided with a

  projection which can penetrate into a corresponding recess

  dant. ) In the case of the last mentioned embodiment, the safety piece can be snapped against

  particularly simple losses on the disposi-

mass of inertia.

  In the case where the fixing means must be pushed in from the free ends of the tabs

  tightening, it is advantageous to constitute the cor-

  corresponding around the longitudinal axis of the fastening means

  in the catch area from behind with a

  oblique tie which is oriented with regard to the fixing means to be put in place so that after putting this fixing means on the oblique part is introduced

  a force with a considerable component in the direction ra-

  dial in the free ends of the clamping tabs. In this way these ends are spaced radially from each other and remain in this position until the

  fastening means has exceeded the socket area from behind

  laugh. Then the free ends of the clamp tabs

  rage fit radially together to hold the medium

  fixing as already described by means of its sec-

  radial approach in a position in which

  it axially bears on the sockets from behind.

  It is possible to have an even lighter insertion by completely renouncing the sockets from behind. According to other characteristics of the invention:

  - the clamping tabs, by inserting the fixing means

  tion, can be deployed relative to their longitudinal axis

  nal against the action of a prestress in the

  radial direction away from this longitudinal axis, in con-

  serving as their support on the fixing means,

  - the clamping tabs have a predetermined location -

  mined an approach section on the longitudinal axis of the fixing means, the clamping tabs are provided at one end on a fixing ring while their opposite ends are free, - the approach section is provided on the axis longitudinal of

  fixing means respectively in the area of the extremi-

  free tee with a clamping tongue,

  - the clamping tabs have at their ends li-

  bres sockets from behind for the fixing elements, - sockets from behind have on their side, located opposite the drive mechanism, an oblique part,

  - the sockets from behind delimit by their inner sides

  radial laughter a passage which can be enlarged to its di-

  maximum meter to push in the fixing means, - a number of clamping devices are provided on the fixing ring, - the fixing ring present, to establish a connection by form engagement with the inertia mass, at least one protrusion that engages in at least one recess of

this mass.

  The invention will be described below in more detail.

  tail from several embodiments, shown in the accompanying drawings, in which: - Figure 1 shows half of a reproduction of a mass inertia device in section with a safety piece against losses with a clamping device for a fixing means; - Figure 2 shows a drawing of the device

  mass of inertia, enlarged, according to FIG. 1, of which it is

  d, in the radial zone of the security piece against losses; - Figure 3 shows a representation in space of a retaining ring with a number of devices for clamping the security part against losses; - Figure 4 shows the same thing as Figure 2, but with oblique parts on sockets from behind provided at the free end of the clamping device; - Figure 5 shows the same thing as Figure 2, but without sockets from behind on the free end of the clamping device; - Figure 6 shows a security piece against

  losses on a mass inertia device with single-

a mass of inertia.

  The inertial mass device, shown in FIG. 1, is constituted with a first inertial mass 1 which has a primary flange 7 extending radially

  outwards which is used to connect it to a crankshaft-

  quin 3 of an internal combustion engine, crankshaft serving as a drive mechanism 4. To connect this mass of inertia 1 to the crankshaft 3 there are provided fixing means 5, being in the form of bolts

  which are arranged relative to each other at inter-

  angular valleys which can be determined beforehand on a circle around a median axis 54 of the inertial mass device. Each fastening means 5 penetrates before engaging in the crankshaft 3 as well as in a spacer washer 11, disposed on the side of the primary flange 7, located opposite the crankshaft 3 and a recess 8 in the primary flange 7. The spacer washer 11 serves to receive a safety piece against losses 12 for the fixing means 5, a clamping device 70 being provided for one of the fixing means respectively, clamping device to which we will return in a more detailed manner in what follows and which, as can also be clearly seen from FIG. 3, is arranged at the same time as other clamping devices 70 on a common fixing ring 14 of the security piece against losses 12. The spacer washer 11 is provided on its inner radial zone with a projection 18 which engages in a recess 20 in the fixing ring 14 after locking byspring of the latter on the projection 18, so that in this way it occurs

  a link 16 by shape engagement between the securing part

  curity against losses 12 and the spacer 11 and in this way the first mass of inertia. According to Figure 3 can be formed instead of this connection by form engagement 16 also passages 21 in the fixing ring 14 which after having been traversed by not shown fixing elements, such as bolts or rivets, allow to bond the security piece against

  losses 12 with the mass of inertia 1.

  If we now return to the mass device

  of inertia, this present in the radially central area

  trale of the primary flange 7 a planetary wheel 24 which engages by means of an external toothing with an internal toothing of a planetary gear ring 26 which is

  consisting of a single piece with a hub disc 28. This-

  it has on its radially outer area fingers which come to bear at the ends of accumulators

  of energy 32, the energy accumulators on their side

  bearing on control elements, not shown, on the primary flange 7 and on a cover plate 38

  which extends substantially parallel to this primary flange

  mayor. The accumulator is passed radially outside

  energy generator 32 on shoes which bear on their side on an axial appendage 36, consisting of a single piece with the primary flange 7, axial appendage 36 on which is

  fixed the cover plate 38 already mentioned.

  In the radially inner zone of the cover plate, this is connected by means of an axial spring 42 to the hub disc 28, the axial spring 42 serving as a seal 40 for a grease chamber 37 which, seen in the axial direction, is limited on the one hand by the primary flange 7 and on the other hand by the cover plate 385 and receives the part of the hub disc. 28 which is radially outside the seal 40 , together with the energy accumulator 32 and the pads 33 to form a damping device 34. The hub disc 28 is radially integrally connected inside the seal 40 by means of a riveting 44 to a second mass of inertia 46 and has in the radially inner zone a secondary hub 48 which serves, by means of a radial support 50, received on the spacer washer 11, to center the second mass of inertia 15 tie 46 with respect to the first mass of inertia 1. In the axial direction takes place an alignment of the two masses of inertia with respect to each other by means of an axial support 52 which on the one hand comes to bear on the spacer washer 11 and

  on the other hand on the hub disc 28.

  Returning now to the safety piece against losses 12, the clamping device 70 has a number of clamping tongues 60 which are arranged in the form of a ring around the longitudinal axis 62 of the fixing means 5 respectively. received, and secondly on the fixing ring 14. The opposite ends 64 of the clamping tabs 60 which surround a housing 61 for the means of

  corresponding fixing 6 are however free are

  killed on their inner side, respectively turned towards the fixing means 5, in the region of these free ends 64 with respectively an approach section 68 which occurs

  in the form of an oblique part in the direction of the long axis

  gitudinal 62. The free ends 64 transform themselves

  same in sockets from behind 66, extending sensibly

  so radially that radially delimit a passage 72

  which extends around the longitudinal axis 62.

  The operation of this security part con-

  the losses 12 is such that firstly a fixing means 5 is pressed into each clamping device 70, namely in fact by the open side of the clamping device, therefore from the fixing ring 14 in the direction of the free ends 64 of the clamping tongues 62. As soon as the outside diameter of the fixing means 5, formed here by the head 75 of a bolt, arrives in the axial zone of the approach sections 68 on the clamping tongues 60, these are widened radially outwards, but remain in

  radial support on the fixing means 5 due to their elasticity-

  properity and, where appropriate, their prestressing,

  such that this fixing means 5 is held by engagement

  friction bearing. By continuing to depress the fixing means

  tion 5 in the clamping device 70 the fixing means comes to bear axially on the sockets from behind 66,

  so that nothing prevents more than one hand from pursuing

  vre its movement through them in the direction of movement

  previous position and at the same time be maintained without this position by the approach sections 68 on the tabs of

  tightening 60. As soon as all the fixing means 5 are inserted

  res in the respectively associated clamping device 70, my fixing ring 14 is fixed in one of the ways already described, for example by means of the connection by form engagement 16, on the spacer washer 11. The means of

  attachment 5 can then, assuming that they separate

  but from the position already described in the service device

  rage, continue to slide only in the direction of the spacer 11, but it does not remain for

  them more possibility to leave the security room

  tre losses 12. For the mounting of the inertia mass device on the crankshaft 3 is carried out using the fixing means 5 a rotational movement, whereby its rod 74, provided with a thread is screwed into a threaded hole, not shown, of the crankshaft 3, until the side, facing the rod 74, of the head 75 of the fixing means 5 comes to bear on the spacer washer 11 and presses the latter together with the primary flange 7 against the crankshaft 3. The mass of inertia device is then fixed on the crankshaft 3, of

  so that, as there is no longer any fear of losing in-

  following the fixing means 5, the piece can be detached

security against loss 12.

  While the direction of insertion of the fixing means

  tion 5 in the clamping device 70 takes place according to the

  gures 1 and 3 usually from. side of the ring

  attachment 14, there is also the possibility in the case of mo-

  of embodiments according to FIGS. 4 and 5 of carrying out the

  darkening of the fastening means 5 from the opposite side, so in this way also in the case where the security piece

  against losses 12 is already mounted on the spacer washer

  11. For this, provision has been made according to FIG. 4 to have an oblique part 71 on the sockets from behind 66, an oblique part which, as soon as the head 75 of the fixing means 5

  poses on them, has the consequence that a

  radial force during the application of an axial force towards the longitudinal axis 62, whereby the passage 72 expands and in this way has the possibility of also having a passage of the head 75 of the fastening means 5. As soon as the head 75 has passed through the passage 72, the tongues

  clamping 60 return almost to their release position

  part, that is to say that they go precisely to a point

  o on the one hand the sockets from behind 66 prevent movement

  ment behind the fastening means 5, but on the other hand the approach sections 68 maintain on the tabs of

  tightening 60 the fixing means 5 in this position.

  In an analogous manner the fixing means 5

  can be inserted according to the embodiment according to figure

  gure 5, being noted that here also due to the absence

  of catches from behind cannot be prevented by a commitment

  form of a return back of the fixing means 5. Instead of the fixing means 5 is held purely by a friction engagement the approach sections 68 coming

  radially resting on the head 75.

  Figure 6 shows the fastening part against losses 12 on a mass of inertia device having only a mass of inertia 1. As apart from that there are no differences compared to the embodiment of the part security against losses 12 according to Figures 1 to 1il 3, it does not seem necessary to go into detail at

subject of this figure.

Claims (6)

R E V E N D I C A T IONS   1) Mass inertia device, in particular for clutches of motor vehicles with at least one mass   of inertia which can be driven in rotation about an axis5 of rotation which has at least one recess for a fixing means serving to connect it integrally to a mechanism   drive nism, fixing means to which is associated a security piece against losses which has a clamping device blocking the fixing means against any exit from the recess, clamping device which, during the action of a force which can be determined beforehand, compressing the fixing means in the direction of its extent, can be widened by deformation to an extent such that, as soon as the fixing means has taken a determined position with respect to it , exerts a clamping action on the fixing means due to a restoring force acting in the opposite direction of the deformation, clamping action by which this fixing means can be kept in this position until a limit pressure operating in the direction of its elongation, characterized in that the clamping device (70) of the fixing means (5) is provided with a number of clamping tongues (60) which extend in direct tion of the fixing means (5) and surround this one in the shape of a ring.   2) inertial mass device according to claim 1, characterized in that the clamping tongues (60), by insertion of the means of   attachment (5), can be deployed relative to their long axis   gitudinal (62) against the action of a prestress in the radial direction by deviating from this longitudinal axis   (62), retaining their support on the fixing means (5).   3) Mass inertia device according to claim 1 or 2, characterized in that   the clamping tongues (60) have at a predefined location   completed an approach section (68) on the longitudinal axis (62) of the fixing means (5).   i 4) inertial mass device according to claim 1 or 2, characterized in that the clamping tongues (60) are provided at one end on a fixing ring (14) while their ends opposites are free.   ) Inertial mass device according to claim 3 and 4, characterized in that the approach section (68) is provided on the longitudinal axis (62) of the fixing means (5) respectively in the area of the free end (64) of a clamping tongue (5) 6) Mass inertia device according to claim 1, characterized in that the clamping tongues (60) have sockets from behind at their free ends (64) (66) for the elements of fixing (5).   70) Mass inertia device according to claim 6, characterized in that the sockets from behind (66) have on their side, located   opposite the drive mechanism (4), an oblique part that (71).   8) Mass inertia device according to claim 6 or 7, characterized in that   the sockets from behind (66) delimit by their inner sides   radial laughter a passage (72) which can be enlarged to its   maximum diameter for driving in the fixing means (5).   9) Mass inertia device according to claim 4, characterized in that a number of clamping devices (70) are provided. on the fixing ring (14).    ) Mass inertia device according to. claim 9, characterized in that the fixing ring (14) has, to establish a connection by form engagement (16) with the inertia mass (2), at least one projection (18) which engages in at least one recess (20) of this mass.