FR2795471A1 - SUPPORT ELEMENT FOR TORSIONAL OSCILLATOR AND DAMPER THUS PRODUCED - Google Patents

Abstract

Support element for an elastically deformable damping element (74) belonging to a torsional oscillation damper to bear against its primary or secondary side or against another elastically deformable damping element. The support element (76) has a surface region (82) facing the sliding surface of the shock absorber and through which the support element (74) moves along this surface. The support element (76) comprises in its surface zone (82) a cavity zone receiving the lubricating agent (88).

Description

Description.

  The present invention relates to a support element for supporting an elastically deformable damping element belonging to a torsional oscillation damper on a primary side and / or a secondary side of the torsional oscillation damper or on another damping element elastically deformable, the support element having an upper surface area which can be positioned so as to be turned towards a sliding surface of the shock absorber and by which the support element can move along the

  sliding surface of the torsional oscillation damper

  According to document DE 41 28 868 there is known a torsional oscillation damper with, between the side

  primary and secondary side, several sets of springs.

  Each set includes several elements of functional springs-

  like damping elements. In the games of res-

  spells, the different elements are pressed against each other in the peripheral direction with interposition of skates. The end zones of the spring sets situated in the peripheral direction, that is to say the ends of the respective springs which are placed there, are supported on spring shoes at the level of the respective stress zones on the primary side or on the secondary side. Both the pads and the spring shoes can be moved to slide in the peripheral direction along a

  sliding surface located radially inside at the

  calf on the primary side or on the secondary side. The area in

  which the spring shoes or shoes can come off

  placing in the peripheral direction is produced in the form of a lubricating agent chamber, sealed so that the sliding movement takes place with the interposition of a lubricating agent between the sliding elements or

respective supporting elements.

  In such support elements in the form of pa-

  tins or spring clogs, the main difficulty is

  that the centrifugal forces generated during operation

  risk of pressing these elements strongly enough

  against the sliding surface and thereby generate

  these increasing friction, opposing the recall of

  the torsional oscillation damper to its new position

  or by creating an additional force component that must be overcome to get out of the neutral position, and achieve the desired movement. This results in problems of

  decoupling and muffled noises up to bat noises

transmission.

  The present invention aims to develop a torsional oscillation damper or a support element for such a damper, making it possible to eliminate to a very large extent the deterioration of the damper operation.

  which would be caused by centrifugal force.

  To this end, the invention relates to a device of the type defined above, characterized in that the support element comprises in its upper surface area at least

  a cavity area for receiving a lubricant.

  Thanks to at least one zone with a receiving cavity for lubricating agent, that is to say a zone in which there is no direct contact between the bearing element and the sliding surface, it is guaranteed that a supporting element which

  slides along the sliding surface always moves

  days on a cushion of lubricant, which largely avoids the risk of an increasing catching effect, linked to centrifugal force, between the support element

and the sliding surface.

  For example, according to the present invention, at least one zone with a cavity for receiving a lubricating agent extends in the direction of movement of the element.

  support. To enhance the cushion effect of lubricating agent

  confident, it is proposed that at least this cavity zone be

  closed in at least one, and preferably in both

movement rections.

  Alternatively, it is also possible that the cavity area receiving the lubricant is opened in

the two directions of movement.

  The effect according to the invention of creating a

  cushion of lubricant between the support element and the

  sliding face can be amplified if there are several such cavity zones which follow one another in the direction of

  movement or / and transverse to this direction.

  For example, provision may be made for the zones with cavities for receiving lubricating agent which follow one another in

  direction of movement are presented with a wavy outline.

  It is also possible that the areas with a lubricant receiving cavity directed in the direction of movement and in the direction transverse to it form a

  grid type reception structure.

  To guarantee the supply of this area

  When the support element is received during the movement of the support element, the invention proposes that at least one zone with a cavity for receiving the lubricant agent is open towards one side of the support element situated mainly at opposite of

the upper surface area.

  It is also possible that at least one zone with a receiving cavity for a lubricating agent comprises a rolling member (preferably a ball) by which the support element bears against the sliding surface. In this case, the support of the support element relative to the sliding surface is made with the interposition of at least one rolling member so that ultimately this totally excludes

  any increase in the hooking effect by the central force

trifuge.

  So that the sliding effect along the over-

  sliding face is as regular as possible it is intended that the support element comes essentially over the entire upper surface area, in a distributed manner, in support

against the sliding surface.

  According to another variant of the invention, the pro-

  problem is solved by a support element of the type defined above

  above, in which this support element comprises in its upper surface area, a sliding surface segment intended to bear against the sliding surface and

  the support element is configured in its area of sur-

  upper face so that, when the sliding surface segment is applied against the sliding surface, a distance between the sliding surface and the surface area

  upper increases from the sliding surface segment

  towards at least one direction of movement of the support element. This ensures that if the support element moves along the sliding surface, the lubricant in this area is forcibly transferred to the area in which the support member comes with its sliding surface segment against the surface

  slip. Finally we realize an assi-

milable to a hopper.

  In such an embodiment, provision is preferably made

  It is important that the distance between the upper surface area and the sliding surface increases in both directions of movement from the sliding surface segment. Through

  example, we can do this in that the sur-

  sliding face is in a central area of

  the support element essentially for the direction of movement

is lying.

  The present invention also relates to a cushioning

  torsional oscillation weaver, in particular for a two-mass flywheel or a clutch disc, comprising a primary side and a secondary side rotating about an axis of rotation relative to the primary side against the action

  of a damping device, the damping device comprises

  taking at least one elastic deformable damping element-

  which, in at least one of its end zones, bears or can bear against the primary side and / or the secondary side of the torsional oscillation damper or against another deformable damping element elastically by means of a support element, characterized in that the shock absorber comprises a support element according to the invention and which moves in the peripheral direction along a sliding surface of the shock absorber torsional oscillations in case of relative rotation between

  the primary side and the secondary side.

  It also relates to a torsional oscillation damper, in particular for a two-mass flywheel or a clutch disc, comprising a primary side and a secondary side which can rotate about an axis of rotation relative to the side primary against the action of a damping device, the damping device comprising at least one unit with damping elements which can bear in their peripheral end zone against respectively a bearing zone on the primary side and on the secondary side of the shock absorber by means of a support element which, in the event of relative rotation between the primary side and the secondary side, can move in the peripheral direction

  along a sliding surface of the oscillation damper

  torsion lations, characterized in that the support element is raised at least by zone with respect to the sliding surface when it cooperates with the support zone on one side

  on the primary side and on the secondary side.

  According to the invention, it is further provided that the respective support element which cooperates with the support area by one side such as the primary side or the secondary side, is raised at least by area relative to the surface slip. Thanks to this lifting, at least by zone, during

  cooperation with the support zone, a tran

  relatively easy sition between a state of friction with

  hooking and a state of friction with sliding.

  We can for example provide that the or each

  support zone, on the primary side or on the secondary side,

  feels attacking an outer radial area at a bearing surface area of the respective bearing member with

an uplift segment.

  The lifting segment can be achieved by

  corner shape and the corner angle is, at least by area, in-

  lower than the angle of inclination of the sliding surface,

  as the opening angle between the radially ex-

  of the upper surface area of support on

  the support element and the sliding surface.

  The present invention will be described below from

  in more detail using exemplary embodiments

  shown schematically in the following figures: * Figure 1 is a partial longitudinal section of a torsional oscillation damper produced in the form of a two-mass flywheel, * Figure 2 is a partial axial section of the torsional oscillation damper of FIG. 1, * FIG. 3 is a perspective view of a first embodiment of a support element according to the invention, * FIG. 4 is a peripheral view of 'a second embodiment of a support element according to the invention, * Figure 5 is a sectional view of the support element of Figure 4 cut along the line VV of Figure 4, * the Figure 6 is a peripheral view of an alternative embodiment of a support element according to the invention, * Figure 7 is a sectional view of the support element of Figure 6 cut along the line VII-VII of Figure 6, * Figure 8 is a sectional view of another support element according to the invention, * Figure 9 is another embodiment of a support element according to the invention, * Figure 10 is a side view of another support element according to the invention, * Figure 11 is a view of the support element of the figure in direction XI in Figure 10, * Figure 12 is a perspective view of the support element shown in Figures 10 and 11, * Figure 13 is a side view of another support element according to the invention, * Figure 14 is a view of the support element of Figure 13 in direction XIV in Figure 13, * Figure 15 is a perspective view of the support element shown in FIGS. 10 and 11, in FIG. 16 is a partial side view in principle of a torsional oscillation damper according to

the invention.

  Figure 1 shows a torsional oscillation damper according to the invention in the form of a two-mass flywheel 10. The two-mass flywheel

  includes a primary side 12 which can be fixed by more

  sieurs bolts 14 on a shaft flange 16 belonging to a drive shaft having the general reference 18, for example a crankshaft. A secondary side 20 can rotate around an axis of rotation A relative to the primary side 12 against the action of a damping device 22. For this there are several devices with different axial or radial bearings

24, 26.

  The primary side 12 comprises a first disc-shaped element 28 fixed to the shaft 18 as shown in Figure 1 and whose free end radially outside

  is joined together for example by welding to a se-

  cond disc element 32. The gap 34 formed between the two disc elements 28, 32 receives a central disc element or hub disc 36 belonging to the secondary side 20. A mass piece 38, or mass serving as a flywheel , is connected to this hub disc 36 by riveting or other means securing it in rotation; this part 38 in turn carries all of the pressure plates 40 of

the friction clutch.

  Both the primary side 12, i.e. the disc elements 28, 32 thereof, and the secondary side, i.e. the hub disc 36, have action zones alternating against which the springs 42 of the damping installation 22 can bear in the peripheral direction. These alternating action zones can be provided, for example in the case of disc elements 28, 32, on the axial projections of these elements; in the case for example of hub discs 36, these zones can be arm segments 44 which appear in particular at the

figure 2.

  According to FIG. 1, on the first element of dis-

  that 28, on the primary side 12, we have, in the peripheral direction

  risk, several deformations 46 in the form of pots which

  each time follow and form a bearing for a flat wheel

  shut up 48. Each planetary wheel is rotatably mounted on this

  bearing 46 in the form of a pot around an axis of rotation A1 es-

  substantially parallel to the axis of rotation A. The wheels

  48 have a peripheral zone with a confi-

  toothed guration 50 constituting a setting zone.

  A hollow wheel 52 is provided on the hub disc 36. This wheel has opposite teeth so that in the event of relative rotation between the primary side 12 and the side

  secondary 20, the planetary wheels 48 are rotated

  tion. This hollow wheel 52 can be produced as a separate part or as a separate assembly installed on the hub disc 36, for example by welding; this part can also be produced directly on the hub disc 36

by shaping and stamping.

  FIG. 2 shows that the damping device 22 of the exemplary embodiment shown comprises two sets of springs 60 formed each of five springs or groups

  of springs which follow one another 42 (these springs are nested).

  The springs or groups of springs 42 of each set of springs

  spells that are at the end zones in the peripheral direction, are supported at one of

  their end zones by means of clogs with res-

  spells 74 against the support or stress areas on the primary side 12, for example provided on the disc elements

  28, 32 or on the respective support or stress areas

  secondary side ves 20; in the embodiment example

  shown, it is a support arm or support 44

  hub disc 36. Between the different res-

  spells or groups of springs 42, there are pads 76 by the-

  which different springs or groups of springs 42

  can lean on each other. Both the sa-

  spring bots 74, that the pads 76 are movable in the

  peripheral direction along the peripheral surface in-

  78 of the cylindrical segment 30 of the disc-shaped element 28. To facilitate this movement and at the same time introduce a damping function, the chamber or

  space 34 contains a viscous lubricant, for example

  ple grease or the like.

  In particular at high rotational speeds, there is the difficulty that the spring shoes 74 and / or the shoes 76, which form the respective support elements, are pressed radially outward so strongly against the surface inner device 78 that the

  friction by catching this surface 78 increases strongly-

  is lying. Therefore, for example when returning to the neutral position, in which the torsional oscillation damper

  transmits practically no torque, the supporting element cen-

  tral 74 or / and 76 does not return to a corresponding position

  but remains retained just before this position. The same remark applies to the travel relative to the neutral position; it is then necessary to overcome first of all an additional friction couple. This deteriorates the spring characteristic or the damping characteristic of

  the torsional oscillation damper. The present invention

  tion concerns various means which allow, in the event of

  relatively high rotational braids and thus relatively intense centrifugal forces, to avoid excessive increase in friction of the various support elements 74, 76 vis-à-vis the smooth surface of the primary side 12 formed

through the inner surface 78.

  A first means consists in using an optimal grease for friction, for example that known under the trade name "SYNTHESO GLK 1 PF" from the company Kl ber Lubrication MUnchen KG. The use of such a lubricating agent significantly ensures that in the event of high stress by centrifugal forces, the increase in friction does not lead to a considerable deterioration in the behavior of the damper of oscillations of the damper.

torsional oscillations.

  In addition, FIG. 3 shows, in the case of a support element in the form of a shoe 76, means facilitating

  the sliding movement even under the effect of a strong soil-

  licitation. We see that the support element, for example the

  tin 76, has a body 80 whose upper surface area 82 is designed to bear against the surface of

  slip 78, i.e. the internal peripheral surface

  lower 78 of the cylindrical segment 30. The other face 84, not facing the upper zone 82 of the shoe 80, has a

  supporting projection 86 for the spring elements.

  In the surface area 82, intended to slide along the sliding surface 78, there are several cavities or cutouts 88; in the embodiment shown, these cavities 88

  follow each other in both the direction of movement and

  versally to this direction. The cavities 88 thus provided create in the surface area 82 a space in which the grease or the lubricating agent can accumulate. These pockets

  lubricant formed by the cavities 88 end in defi-

  final to the establishment of a cushion of lubricating agent on which, in the event of strong centrifugal stresses,

  the support element or the shoe 76 can slide.

  Figures 4 and 5 show a variant of

  reading of such a shoe 76. It can be seen that the body segment, near the peripheral ends, comprises

  cavities 88 distributed in pairs in which one can place

  cer, as shown in Figure 4, elements in the form of

  balls 90. In this case, the shoe 76 moves with interpolation

  sition of spherical elements 90 along the surface of

  slip 78; in this case, this surface constitutes an over-

  rolling face. The cavities 88 are additionally used to receive a greasing or lubricating agent so that, as described

  previously a good fertilizer is also provided at the same time

  wise. Figures 6 and 7 show another variant of a support element or a shoe 76 according to the invention. We also recognize, in the area of the upper surface 82, a cavity 88 which however extends along the entire

  pad extension area 76 in the peripheral direction.

  This means that this cavity 88 is open in the direction

  peripheral device and thus allows, when the shoe 76 comes off

  place in the peripheral direction, the penetration of grease in this zone and the formation of a cushion of grease or lubricating agent. It should be noted that it is also possible to provide several cavities 88 open towards the two

  peripheral sides, cavities juxtaposed in the manner of

nures or the like.

  Another embodiment of a shoe 76 according to the invention is shown in FIG. 8. In this embodiment, the body segment 80 is produced so that in its central zone, that is to say substantially in the area that

  radially follows the support projection 86, it has a segment

  The sliding surface 92 coming to bear against the sliding surface 78. Starting from this sliding surface segment 92, the body 80 is produced so that the entire upper surface area 82 has a distance D relative to the surface of slip 78 increasing. When this shoe 76 moves in the peripheral direction, it acts

  by funnel effect to pass more lubricant

  trusting in the area of the sliding surface segment 92;

  this allows the shoe 76 to move on the lubricant.

  or a cushion of lubricating agent. It is clear that it is also possible to provide, in the upper surface area 82, additional cavities or grooves which, in addition to the effect of reducing the surface segment of the sliding shoe 76 applied against the surface of slip 78, also reinforce the establishment of an agent cushion

  lubricant. Note in Figure 8 a symmetrical realization

  slip of the sliding shoe 76; this means that starting from the middle peripheral zone defined by the support projection 86 and the sliding surface segment 92, the shoe 76

  extends, as in the embodiments presented above

  above, with its zones 98, 100 serving as radial support for the springs, practically identical in the two peripheral directions. A substantially identical movement characteristic is produced in the two directions of movement. FIG. 9 shows a support element 74 in the form of a spring shoe which also moves with a body segment 80 along the sliding surface 78 and whose

  support projection 86 participates in an enveloping support of the

  spells as well as by a rounded outline it leans against a

  complementary contour on the primary side 12 or / and on the se-

  condaire 20. It can be seen that in this case also the surface area 82 facing the sliding surface 78 has

  a hollow zone 88 in which one can have an accumulation

  lubrication agent. We recognize in this mode of realization

  sation that this cavity-shaped area 88 is opened by a channel device formed by at least one through hole 94 towards the side 84 of the spring shoe 74 not turned towards the sliding surface 78. This allows the lubricating agent to arrive in the area between the sliding surface 78 and

  the upper surface area 82 by the peripheral movement

  spring shoe 4 but also radially outward under the effect of centrifugal force through the channel device 94 to reach the area in the form of

cavity 88.

  It is clear that the means described above for reducing friction, that is to say essentially for forming a cushion of lubricating agent between a support element and the associated sliding surface, can be combined with one another. Thus, in all the embodiments described above of a support element, it is advantageous to use

  a lubricant or an optimum grease for rubbing

  is lying. In addition, in all of these embodiments, it may be advantageous to supply the area of the upper surface

  82, in particular the area of the cavity 88 by a device

  nal, open towards the side of the support element not turned towards the sliding surface 78 to ensure the supply of

lubricating agent.

  Figures 10 to 12 show a variant of

  lisation with several such cavity zones 88 one after the other in the direction of movement and extending essentially over the entire width of the zone of

  upper surface 82 applied against the sliding surface

  78. These cavity zones 88 form, in the side view

  in Figure 10, a wavy upper surface contour.

  In this wavy upper surface contour there is always

  a viscous medium which, due to the surface areas

  lower, inclined, turned to the side of the sliding surface

  ment 78, then participates in lubrication by the relative movement between the sliding surface 78 and the support element 74. In this embodiment at least one of the

  cavity zones 88 may have a through hole that appears

rait in figure 9.

  Figures 13 to 15 show another alternative embodiment of a support element 74 according to the invention. In the upper surface area 82, a large number of cavity areas 88 are recognized which extend transversely to the direction of movement and follow each other in this direction; there are also several cavity zones 88 'extending

  in the direction of movement and following transverse-

  to the direction of travel. These cavity zones 88,

  88 'thus form a structure of cavities in the form of a

  buckets in which the viscous fluid used for lubrication can accumulate. It should be noted that it is also possible to have each time only a cavity zone 88 or a cavity zone 88 '. FIG. 16 shows another embodiment of a torsional oscillation damper. The components corresponding to those already described above, by their function or their structure, bear the same references with

the addition of the suffix "a".

  In the case of the torsional oscillation damper 10a shown in FIG. 16, the damping device

  sor 22a has several sets of springs 60a which follow

  wind in the peripheral direction; it may for example be several successive springs or also nested springs. Each set of springs 60a is supported by its peripheral end zones, each time by an element

  respective support 74a against the support zones on the main side

  mayor 12a or the support areas on the secondary side 20a. We re-

  knows that for example the support zones on the primary side

  12a can be produced by attached disc elements.

  tees, as already mentioned and described in connection with Figure 1 or by support projections 200a constituted by

  relief moldings while the support zones on the second side

  Daire 20a must be formed by the respective arm segments 44a. It can be seen that, in the peripheral direction, the support zones, that is to say the arm segments 44a on the secondary side 20a, have a lower elongation than the support projections 200a on the primary side 12a. As a result, the secondary side 20a can be rotated until it is put into action, that is to say until it reaches the elements.

  support 74a by turning at a slight angle relative to

  port on the primary side 12a. It is for example only in passing

  in traction mode, for which the arm segment 44a re-

  presented in figure 16 requests for example the element

  support 74a located on the right, towards a pushing mode for the-

  which this segment of arm 44a then requests the support element

  74a on the left, let this angle then exhaust the angle of ro-

  minimum allowed and that the arm segment 44a then acts on the support element 74a which cooperates with this arm segment 44a during the following operating state for

transmit the torque.

  FIG. 16 shows that the support elements 74a have a surface area 202a, of support, curved, for cooperating with the support areas of the primary side 12a or of the

* secondary side 20a; the curvature of this zone 202a corresponds to

  essentially lays on that of the support surface 204a curve of the support projections 200a. The arm segments 44a also have a corresponding bearing surface 206a which however has a different curvature. It is recognized that in its outer radial zone this bearing surface 206a corresponds to a smaller angle with respect to the sliding surface 78a or a tangent applied thereto; it is a corner angle less than the opening angle formed in this radially outer zone between the bearing surface 204a and the sliding surface 78a or relative to

  a tangent applied to this surface. The effect that

  sulte, is that the movement of approach of the arm segment 44a towards one of the support elements 74a pushes the outer radial zone 208a of this arm segment 44a which forms a lifting segment in this zone, in the manner of a corner against the support surface area 204a and sinks

  thanks to this small angle between the support element 74a and the sur-

  sliding face 78a. It is important here that the attack takes place in the outer radial zone, that is to say even more outside of the zone in which the damping springs are pressed against the support element 74a; it is only if by this attack, the support element 74a is lifted by zone relative to the support surface 78a, that the support surface area 206a comes into surface engagement against the element d 'support 74a. In this situation, the support element 74a is essentially only still in contact with a peripheral end region 110a remote from the corresponding arm segment 44a against the sliding surface 78a. There is thus obtained a significant reduction in the friction effect between the support element 44a and the sliding trajectory 78a so that for example in the transition from traction mode to thrust mode, by attack of the arm segment 44a against one of the support elements 74a, the sets of springs 60a act by elasticity and do not create

of shaking.

Claims (9)

R E V E N D I C A T I ON S   1) Support element to support a shock absorbing element   elastically formable belonging to a torsional oscillation damper (10) on a primary side (12) or / and a secondary side (20) of the oscillation damper   torsion (10) or on another damping element (42)   resiliently formable, the support element (74, 76) having an upper surface area (82) which can be positioned so as to be turned towards a sliding surface (78) of the shock absorber (10) and through which the support element (74, 76) can move along the sliding surface (78) of the torsional oscillation damper (10), characterized in that the support element (74, 76) has in its upper surface area (82) at least one cavity area (88) for receiving a lubricating agent.   2) support element according to claim 1, characterized in that   the cavity zone (88) is elongated in the direction of de-   placement of the support element (74, 76).   3) support element according to claim 1 or 2, characterized in that the cavity zone (88) is closed in at least one and   preferably in both directions of travel.   4) Support element according to claim 1 or 2, characterized in that the cavity zone (88) is open in both directions of movement.    ) Support element according to one of claims 1 to 4,   characterized by several cavity zones (88) distributed one after the other   others in the direction of movement and / or transverse   in the direction of travel.   6) support element according to claim 5, characterized in that the cavity zones (88) which follow in the direction of   displacement are made in the form of a wavy outline.   7) support element according to one of claims 5 or 6,   characterized in that the cavity zones (88, 88 ') directed in the direction of movement and transverse to it constitute a   reception area outline in grid form.   8) support element according to one of claims 1 to 7,   characterized in that at least one cavity zone (88) is open towards one side (84) of the support element (74, 76) situated essentially at   opposite the upper surface area (82).   9) support element according to one of claims 1 to 8, characterized in that   in at least one cavity zone (88) there is a rolling member   LEMENT (90), preferably a ball, by which the element   support (76) rests against the sliding surface (78).    ) Support element according to one of claims 1 to 9,   characterized in that the support element (74, 76) comes to bear against the sliding surface (78), in a distributed manner, essentially on   the entire upper surface area (82).   11) Torsional oscillation damper, especially for a   dual mass flywheel or a clutch disc,   taking a primary side (12) and a secondary side (20) rotating about an axis of rotation (A) relative to the primary side (12) against the action of a damping device (22), the damping device ( 22) comprising at least one elastically deformable damping element (42) which, in at least one of its end zones, rests or can   lean against the primary side (12) or / and the secondary side   / f daire (20) of the torsional oscillation damper (10) or   against another elastic deformable damping element (42)   cement by means of a support element (74, 76), which moves in the peripheral direction along a sliding surface (78) of the vibration damper of   torsion (10) in case of relative rotation between the main side   mayor (12) and the side, secondary (20), characterized in that the shock absorber comprises an element (74, 76) according to one of 0 claims 1 to 10.