FR2628814A1 - SEALING, IN PARTICULAR RADIAL SEALING FOR SHAFT OR SEALING SLEEVE - Google Patents

Abstract

The invention relates to a seal, the sealing segment 22a, 22b and / or the fixing segment 21a, 21bs are provided with elements 23 composed of a magnetizable material. These elements can be presented in the form of a magnetic powder which is embedded in the seal. In this way, it is possible to provide a predetermined prestressing of the sealing lips 27 as well as a fixing of the sealing gasket. We can thus dispense with fixing means or mechanical prestressing.

Description

The invention relates to a seal

  sheaity, in particular to a radial seal for trees or to a bellows, intended to close the joint between a hollow external element and an internal element mounted in the external element, gasket which comprises

  a fixing segment, associated with one of the elements in po-

  fixed position, and a sealing segment pressed against the other element by at least one sealing lip, and in which at least the sealing segment is

elastic configuration.

  In a radial seal for ar-

  bres, but also for bellows, we often plan

  springs, in particular suspender springs

  them, in the region of the sealing lip, to reach

  dre the necessary prestressing, or to guarantee the maintenance of a predetermined prestressing over a predetermined lifetime. In addition, in other forms of seals or bellows, for example,

  in the case of U-shaped fittings with double lip or bellows

  roof profile flounders, no special construction measures are available to adjust the prestress

  or the contact pressure of the sealing lips, e.g.

  concept of the own prestressing which results from the

  formation and / or the nature of the material.

  Based on this fact, the invention aims to provide a seal

  in which it is not necessary to provide any

  special mechanical action to obtain the pre-

  necessary stress or the adhesive force of the lip

  seal, as well as other measures to maintain a seal in a fixed position with respect to a bearing or rolling element in

  the state of pre-assembled sub-assembly.

  According to the invention, this problem is solved by the fact that the sealing segment and / or the sealing segment

  fixing is or are provided with element (s) made of a ma-

magnetizable.

  Retaining the seal in the pre-assembled state or maintaining it

  sealing lips on the part to be enclosed

  Sea tight seal is ensured via magnetizable elements. This results in the need for a

  more or less strong magnetization depending on the application cases

  cation. It is thus possible to dispense with means of precon-

  mechanical body. Furthermore, it is also possible to adopt a disposition of the magnetized or magnetizable elements in the region of the fixing segments of a gasket.

  that ensures the necessary retention of the gar-

  tightness relative to the room in which

she is housed.

  It is better to use as elements

  magnetizable to be incorporated in the seal

  t at the time of its manufacture, elements presented in the form of a metallic powder. Incorporation

  metal powder or other material may be carried out

  kill as well in the case of seals made of plastic, during injection,

  that in the case of rubber seals

  cabbage. However, we can still consider carrying out

  the elements in the form of a coating made of a ma-

magnetizable.

  Finally, the magnetizable elements can

  also made in the form of a metal wire ring

  that or segments of metal wire rings, which are

  embedded in the seal.

  In addition, it is still possible to drown

  several elements arranged locally, for example,

  gone around the circumference. In this case, these elements

  may have, for example, the shape of segments of a cy-

lindre.

  The elements to be incorporated or applied can be presented in the form of magnetic elements already

  magnetized before their incorporation or before their application

  tion, or in the form of elements which can be ai-

mantés after their establishment.

  A particularly advantageous application

  relates to the pre-joint sealing for the turret

  Lillon of a trunnion of a car joint cross

  dan in which the fixing segment is associated with the journal and the sealing segment is supported by a

  sealing lip against the front surface of the

  rolling or in the region of the front surface

  the of this ring. In the case of universal joints, the

  bearing ring, bearing needles and gar-

  niture of the main joint and the pre-joint are made

  in the form of a pre-assembled sub-assembly. This sub-in-

  seems is then assembled to the cross, by the fact that after having threaded the cross into the holes

  of the fork branches, we put the ring on

  Lement, with the pre-joint trim from the outside on the trunnion, and in the drilling of the fork legs. The fact of providing the gasket trim

  of magnetized or magnetizable elements facilitates the pre-installation

  tage of the sub-assembly. No mechanical measurement Darticu-

  is not necessary to hang the pre-seal trim on the main seal trim or on the

  bearing ring. Maintaining the assembly of the ba-

  bearing and front seal packing is as-

secured by the magnetic elements.

  In addition, by playing on the concentration of the magnetized elements, for example, by arranging them

  with a higher population density in the re-

  region of the fixation segment, we can also do

  sort of give the pre-joint trim a fixa-

solid on the trunnion.

  As another preferred area of use, mention may be made of the main seal lining of a universal joint bearing, in which case the fixing segment

  is associated with a support and the sealing lips ap-

  from the sealing segment presenting the elements

  elements composed of a magnetized or magnetizable material.

  In this case, the preload of the sealing lips can be calculated in relation to the journal or the ring.

of rolling.

  For the case where the elements are part of a

  garment, it is planned to apply the coating on the

  sealing lip of the sealing segment.

  The figures of the appended drawing, given by way of example, relating to the case of application of the invention

  to drive shafts, will make it clear how

  ment the invention can be realized. In this drawing, Figure 1 shows a drive shaft in side view and partly in section;

  FIG. 2 represents a crosspiece, represented

  sectional tee in the bearing region of a journal; Figure 3 shows a first example of

  production of a pre-assembled sub-assembly fitted with gaskets.

  sealing res comprising a magnetic powder incorporated

  porée to form the magnetized elements;

  Figure 4 is a section of a wheel ring-

  main and front seal fittings

  joint comprising a magnetizable coating;

  Figure 5 is a section of a wheel ring-

  main and front seal fittings

  joint comprising rings of metal wire rings

that magnetized and;

  FIG. 6 is a section corresponding to the figure

  gure 3 and in which magnetic elements are distributed

  woven on the circumference in the attachment segment of

the gasket trim.

  The application of the measures according to the invention is explained in more detail with regard to an example of

  realization, more precisely about watertight seals

2628814

  inheritance of transmission shafts. However, the applica-

  tion of the education given can be envisaged

  general lesson for radial shaft seals and bellows, for example, in the form of bellow bellows, two-lip U-cup cup bellows and profile bellows

on the roof.

  In Figure 1, there is shown a transmission shaft 1. This shaft comprises two universal joints

  2 and 3 which are joined to each other by an inter-

  medial 4. Each of the two universal joints 2 and 3 is

  composed of a flange fork 8 intended to be connected

  der to a mechanical organ to be entrained or trained, as well

  than a drive fork 9 which is connected soli-

  rotated to the intermediate shaft 4. The four-

  drive head 9 and the flange fork 8 includes

  are branches in which are pierced-

  ges 7. The holes 7, contain with interposition of

  bearings, cross bars 5 each of which includes

  three pins arranged perpendicular to each other

  other. Each bearing comprises a ring 6 which is

  inserted in hole 7 and which receives internally

  the corresponding pin of the cross 5.

  The intermediate shaft 4 comprises, from the

  spider 3, a tube 10 which is welded to the fork

  traction 9, and an inner part 11 fixed to the tube

  and which has the shape of a tip of a tree and is mu-

  nie of a groove 13, which is engaged with an inner groove of an outer element 12 which forms a part of the drive fork 9 of the other

  universal joint 2. Thanks to the groove 13, the ex-

  12 can describe a translational movement

  relative to the inner part 1 but the transmission of the torque is at the same time ensured by

through the groove.

  Figure 2 shows a spider 5 with the bases

  bearing gues 6 mounted on the journals 14. The

  cross 5 includes four pins 14 which are an-

  right in relation to each other and who possesses-

  tooth a cylindrical outer surface 15. On the outer surface 15 are mounted rolling needles 17.

  The needles 17 are further mounted to roll against

  be the cylindrical wall of the bore 16 of the bearing ring 6. The ring 6 bears against the end surface 18 of the pin 14 by the internal surface of

  its background. In the interval between the surface ex-

  dull 15 of the journal 14 and the wall 16 of the bore of

  the bearing ring 6, are arranged against the ai-

  bearing sleeves 17, firstly, in the al-

  lant towards the center of the spider, a main seal gasket 20 then a pre-gasket gasket. The front seal 19 serves to ensure a seal

  coarse, i.e. to prevent the penetration of its

  smoothing from the outside while the main seal 20 mainly serves to retain the grease

  necessary for the lubrication of the bearing in the

  gion of the needles 17 and of the terminal surface 18 of the

  trunnion. The configuration and layout of the gar-

  main gasket 20 and front trim

  seal 19 in the bearing ring 6 are described with

  more details with reference to Figures 3 to 6 of the drawing.

  Figure 3 shows a first example of a reali-

  station. In all of Figures 3 to 6, the roll ring

  ment 6 is shown in section. This ring forms a

  pre-mounted bearing sub-assembly and includes the ai-

  bearing guilles 17 already in place and taking on

  then axially on additional washers.

  In the bearing ring 6 is disposed a main seal lining 20, which bears against the internal surface 16 of this ring, and which follows the

  needles 17 of the bearing in the direction towards the ex-

  open end of the ring 6. The seal gasket

7 2628814

  main 20 includes a sheet metal casing 24 made up of

  killing a support and to which the main seal gasket is fixed by its fixing segment 21b, for example, by vulcanization. The support 24, constituted by a sheet metal envelope, has a projection directed towards the open end of the rolling ring 6 and which is folded radially outwards and engaged in

  a circumferential groove 25 for blocking.

  The main seal lining 20 has, on one side of the fixing segment 21b, two sealing lips 22b which are inclined towards the open end of the ring 6 of the bearing. At the open end of the ring 6,

  followed by the pre-seal gasket 19. This gasket

  re also includes a fixing segment 21a by the-

  which it can be securely fitted on all

  rillon 14. It also has a sealing segment.

  tee 22a which is in contact with a watertight seal, by its lip

  seal 26, against the front surface 28 of the base

  gue 6 of the bearing, or in the region of the front surface

  tale 28 of this ring. The sealing lips of the

  main seal 20 are designated by 27.

  As can be seen from the drawing figures,

  the front seal 19 in cross section

  versale a roughly V shape, that is to say the shape of a two-lip trim. Magnetic elements are incorporated and distributed in the front seal 19 and in the main seal.

  magnetizable, presented in the form of a ma-

  genetic. In the case of the main gasket, these elements 23 of magnetic powder are arranged

  only in the region of the sealing lips 27.

  These magnetic elements 23 hold the lips tight

  support 27 resting on the external surface of the corresponding pin 14 of the pin 5, with a prestress

  previously chosen, which is defined by the degree of aid

  mantation. This ensures that even in the presence of a usu-

  re that occurs during the service life it is ga-

  ranti to always get a good waterproof support.

  In the case of the front seal 19, the elements 23 made of a magnetic powder are arranged distributed and, more precisely, both in the fixing segment 21a and in the sealing segment

  22a. This guarantees, on the one hand, a pre-stress of

  then, which can be fixed in advance, the sealing lip

  square 26 against the front surface 28 of the ring

  bearing 6 and, secondly, that for the state of the sub-

  pre-mounted assembly shown in Figure 3, the trim

  pre-joint structure 19 is kept pre-mounted on the base

  bearing guide 6. The sub-assembly consisting of the ring

  bearing 6, bearing needles 17, gar-

  main gasket 20 and front trim

  gasket 19 can be stored for mounting and can then be fitted as a single unit into hole 7 in

  the corresponding fork 8 or 9 of the seal, on all

  rillons 14. Furthermore, the magnetized elements 23 contain

  bare in the region of fixation segment 21 guaranteed

  feels that the gasket 19 can be kept angular-

  ment integral with the pin 14. For this purpose, there is provided, for example, in the region of the fixing segment, a higher concentration of magnetic elements 23, under the

  form of a magnetic powder, than in other re-

  gions. The magnetic powder is incorporated during the

  manufacturing process for the main gasket

  pal 20 and the front seal 19.

  In the example of embodiment according to the figure

  4, substantially the same agency conditions are obtained-

  ment than those described with reference to figure 3. The

  the only difference is that 23 ma-

  gnétisables are contained in the front trim

  gasket 19, while the main gasket 20 does not contain magnetizable elements. In the exemplary embodiment according to FIG. 4, the sealing lip

  26 by which the front seal 19 is fitted

  puyée against the front surface 28 of the rolling ring

  ment 6 is provided with a layer forming the magneti-

  sand 23. The layer can be formed, for example, by injection molding of the lining in the process

  two components, i.e. by means of two extruders

  his. In the exemplary embodiment according to FIG. 5, provision is made, for holding the front seal lining 19 against the front surface 28, that is to say a

  peripheral ring of metal wire composed of a ma-

  magnetizable face, i.e. ring segments made of metallic wire

  metal which form the magnetizable elements 23.

  Finally, in the embodiment according to FIG. 6, magnetizable elements 23 in the form of

  bars are distributed around the circumference in the re-

  fastening element 21a of the front seal trim 19.

  These elements have the effect that the front trim

  gasket 29 can be held in position relative to-

  the internal surface 16 of the rolling ring 6 in the region of the open end of this ring to give

  thus birth to a subset that can be pre-assembled

  you. Preferably three magnetic bars can be provided.

  only 23 of this type drowned in the trim.

  Of course, various modifications may be made by those skilled in the art to the device which has just been described solely by way of example without

depart from the scope of the invention.

Claims (10)

R E V E N D I C A T I ONS   1. Packing, in particular packing   radial for trees or bellows, intended to close her-   metrically the joint between a hollow external element and   an interior element mounted in the exterior element,   niture which includes a fixing segment associated with   one of the elements in a fixed position and a segment of water   sheaity pressed against the other element by at least one lip   sealing glass, and in which at least the segment   sealing is of elastic configuration, characteristic   in that the sealing segment (22a, 22b) and / or the fixing segment (21a, 21b) are provided with elements   (23) composed of a magnetizable material.   2. Seal according to claim   tion 1, characterized in that the elements (23) consist of a metallic powder which is incorporated in the seal (19, 20) at the time of its manufacture.   3. Seal according to claim   tion 1, characterized in that the elements (23) consist of a coating applied to the lining   and composed of a magnetizable material.   4. Seal according to claim   tion 1, characterized in that the elements5 (23) are   - consisting of rings or segments of magnet rings -   wire sands, which are embedded in the lining re sealing (19, 20).   5. Packing according to claim   tion 1, characterized in that the elements (23) are   locally arranged cylinder segments, particularly left according to the circumference.   6. Packing according to any   of the preceding claims, characterized in that   the elements (23) are constituted by magnetic elements   ticks that are magnetized before their establishment.   7. Packing according to any one   claims 1 to 5, characterized in that the elements   elements (23) are magnetized after being incorporated into   the seal (19, 20).   8. Seal according to claim   tion 1, characterized in that it constitutes a packing   re-joint (19) for mounting a trunnion   (14) belonging to a spider (5) of a car-   dan (2, 3), the fixing segment (21a) being associated with the pin (14) and the sealing segment (22a) being pressed by its sealing lip (26) against the surface   front (29) of the bearing ring (6) or in the gion of this frontal surface.   9. Seal according to claim   tion 1, characterized in that it constitutes the lining   re main seal (20) for the journalling of a pin (14) of a spider (5) of universal joint (2, 3), the fixing segment (21b) being associated with a   support (24) and the sealing lips (27) which appear   relate to the sealing segment (22b) presenting the   elements (23) composed of a magnetizable or ai- mantée.   10. Seal according to claim   tion 3, characterized in that the coating is applied   on the sealing lip (26) of the sealing segment tee (22a).