FR2534999A1 - Elastic attachment devices, especially for motor power units of automobile vehicles - Google Patents

Abstract

Elastic attachment device comprising an elastic central block 1 stuck to a central ring 2 and to a peripheral element 3-4. The peripheral element 3-4 only exerts a prestress on the elastic central block 1 after the attaching device has been mounted on its support 7. Application to elastic attachments.

Description

ELASTIC FASTENING DEVICES, ESPECIALLY FOR POWER UNIT

OF MOTOR VEHICLES.

  The present invention relates to elastic fastening devices,

  in particular for motor vehicle powertrains.

  Numerous elastic fastening devices are already known, in particular

  cylindrical bearings, which are used either as joints, for

  example of a suspension arm at the body of a vehicle, either for

  hang a mechanical element, such as an engine.

  The mechanical characteristics of these elastic fasteners are improved

  by creating compression preloads in their mass.

  These are generally obtained after molding, either by being re-painted

  the outer ring which surrounds it, either by expansion of the inner ring

  axial axial This operation of prestressing the mass in elasto-

  mother is therefore added to the previous injection and adhesion

  the rubber on the rings and therefore constitutes an additional cost.

  The object of the present invention is to manufacture an elastic fastener in a less costly manner than previously, by eliminating this operation.

  prestressing at the manufacturing level.

  According to the invention, the elastic fasteners are obtained by the simple

  injection of an elastomer, which is adhered to a peri-structure

  particular shape, in the absence of any pretension.

  However, the presence of such prestresses being beneficial in the final arrangement, it is created, in masked time, during assembly.

  itself of the elastic fastener in the final device.

  The invention will be described by way of non-limiting example with regard to Figures 1 to 17 attached, which relate respectively to Figures 1 and 2, to an axial section of the device of the invention

before and after mounting.

  Figure 3, in an elevational view of the same device.

  Figure 4, in an elevational view of a first variant.

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  2 - Figures 5 and 6, respectively an axial section and a view in

elevation of a second variant.

  Figure 7, a perspective view of a variant.

  Figures 8 and 9, two elevational views of one type of variant, se-

lon the invention.

  Figures 10, 11, and 12, another type of variant, respectively

  seen in elevation, partially and in perspective, and from the front.

  Figures 13 to 17, yet another type of variant, seen in elevation.

  With reference to FIGS. 1 to 3, it can be seen that the elastic fastener 1 is adhered by any known means, respectively to an internal ring and to two external flanges 3 4 The latter, obtained for example by stamping a sheet metal, consist of: '' a part 5 in contact with the block 1 and a peripheral zone situated in a perpendicular plane

  to the axis of the ring 2 and constituting the clamping and fixing ears 6

tion to any suitable structure.

  Note that the two flanges 3-4 are separated from each other, at the level of the ears 6 by a distance 'Id ", and that the part 5 in contact

  with the elastic block 1 makes an angle "a" with the axis of the ring 2.

  At this stage of manufacture, no prestressing exists in the assembly.

ble previously described.

  When it is mounted on the structure 7 by means of a bolt 8,

  posed through an orifice provided for this purpose in the various elements concerned, the concomitant tightening has the effect of bringing the ears 6 and therefore of compressing the elastic block 1, due to the cfnicity "a"

of the parties 5.

  The desired prestresses are thus created in the elastic block 1,

  terminated by the distance "Id" which was provided for this purpose during the des-

  sin of the part, this during the same operation which performs the

  rage of the parts to be adjusted, therefore excluding any specific operation

  We are then in the situation shown in Figure 2.

  We see in Figure 3 that the elastic block 1, has recesses 9

  intended to give it a certain flexibility, its section as well as that

  the part 5 in contact with the corresponding flanges being sensitive

definitely circular.

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  3 - On the other hand, according to the variant of Figure 4, we see that we can

  give these sections an oblong shape, or other, as required

  operating or installation tees.

  In FIGS. 5 and 6, the flanges 10-11 have parts 12-13 in contact with the elastic block 1 which also determines an angle with the axis of the internal ring 2, but in the opposite direction to that which has been mentioned. previously The pinching of the elastic block still occurs when the flanges 10-11 are brought together during their tightening on the structure 7 The advantage of this particular arrangement lies

  in the possibility of bringing the fixing axis of the bolts 8 closer together.

  In FIG. 7, a variant is represented according to which the peripheral zone

  size of flanges 14-15 determines three mounting ears 16-17-

  18. According to FIGS. 8 and 9, the prestressing of the elastic block 1 obtained during its assembly results from another principle. According to the variants,

  it is no longer the conicity of external flanges which acts, but the Vac-

  tightening of an external collar respectively 20-21, the po-

  sition at rest, illustrated in figures 8-9, determines an opening

  angular "a" 'of its free ends As before, this pre-

  constraint is carried out in masked time "s when mounting lfensem-

ble on the support.

  The same idea can be transposed to a similar assembly whose outer collar is composed of several complementary parts such as 2324, joined by cooperation of their ends opposite to those taken into account during tightening, as is clearly visible in the

  detailed view illustrated by figure l.

  This composite device implies that at least one of the parts 23-24 of the collar has not been previously adhered to the elastic block 1; he

  can be particularly useful when the volume of access available

  ble for its mounting is particularly limited The whole is visible

ble & figure 12 o

49398 1

  In the representations of FIGS. 13 to 17, the principle of the necklace ex-

  the clamping surface in at least two parts is taken up, these latter

  however, being adhered to the elastic block Tightening when fixing

  tion is carried out at each of the ends in contact of the two half-necks

  liers, which gives a better distribution of the prestress in the elastic block. This is predetermined by the distance "d" which

  separates said ends at rest.

  Figures 13 and 14 show a first embodiment according to-

  which the two half-collars 30-31 are symmetrical.

  According to FIG. 15, we note the preponderance of part 32 over

  gard of the other part 33 of the outer collar.

  In FIG. 16, only the element 34 can be assimilated to a portion of

  collar, the other element 35 being constituted by a plate.

  Similarly, according to FIG. 17, a plate 36 cooperates with a collar.

  link 37 which may be approximately angular in shape, but which

could be even different.

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Claims (2)

CLAIMS Elastic attachment device of the type comprising an elastic central block (1) adheris 6 & a central ring (2) and to a 6 peripheral element (3-4) characterized in that the element p 6 riphé 6 rique (3-4) does not exert a prestress in the elastic central block (1) until after the elastic fastening device has been mounted on its support (7) 0 2 Elastic fastening device according to claim 1, characterized in that the peripheral element consists of two elastic flanges (3-4) consisting of a part (5) in contact with the elastic block (1) and a peripheral zone located in a plane perpendicular to the axis of the ring (2) and constituting ears (6) for clamping and fixing to the structure (7).   3 elastic fastening device according to claims 1 and 2, ca-   characterized in that the flanges (3-4) are separated 6 S from each other, and   that their parts (5) in contact with the elastic block (1) determine   nent an angle with the axis of the ring (2), so that by bringing the flanges (3-4) from each other and due to the presence of the previous angle, a determined prestress is created in the block (1) o 4 Elastic fastening device according to claim l, characterized in that the peripheral element 6 consists of a collar (20-21),   open in the rest position at an angle "a", and whose ends 6 S li-   ber are brought closer together when the fastener is mounted on its support (22),   thus creating predetermined stresses in the elastic block 6 (1).   Elastic fastening device according to claim 1, characterized in that the peripheral element consists 6 of at least two complementary parts (23-24), one of the ends of each of which is of complementary shape so as to cooperate between them, while the   other free ends are brought together during mounting on the support   port (22), thus creating predetermined stresses in the elastic block (1) 6 Elastic fastening device according to claim l, characterized in that the peripheral element consists of at least two parts 49398 1 Z 534999   6 - (30-31) adhered to the elastic block (1) and the ends of which are distant from each other at rest, their bringing together two by two when the fastener is attached to its support creating constraints   desired and balanced in the elastic block (1). 49 398 11 676