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WO2000028228A1 - Protective sheath for drive shaft cardan link with incorporated clamping device - Google Patents

Protective sheath for drive shaft cardan link with incorporated clamping device Download PDF

Info

Publication number
WO2000028228A1
WO2000028228A1 PCT/FR1998/002366 FR9802366W WO0028228A1 WO 2000028228 A1 WO2000028228 A1 WO 2000028228A1 FR 9802366 W FR9802366 W FR 9802366W WO 0028228 A1 WO0028228 A1 WO 0028228A1
Authority
WO
WIPO (PCT)
Prior art keywords
protective sheath
cylindrical end
clamping
sheath
cylindrical
Prior art date
Application number
PCT/FR1998/002366
Other languages
French (fr)
Inventor
Patrick Mersch
Bernard Lagier
Original Assignee
Yamajany S.A.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yamajany S.A.R.L. filed Critical Yamajany S.A.R.L.
Priority to PCT/FR1998/002366 priority Critical patent/WO2000028228A1/en
Publication of WO2000028228A1 publication Critical patent/WO2000028228A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/84—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor
    • F16D3/843—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers
    • F16D3/845—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers allowing relative movement of joint parts due to the flexing of the cover
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/04—Bellows
    • F16J3/041—Non-metallic bellows
    • F16J3/042—Fastening details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/84—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor
    • F16D3/843—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers
    • F16D3/845—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers allowing relative movement of joint parts due to the flexing of the cover
    • F16D2003/846—Venting arrangements for flexible seals, e.g. ventilation holes

Definitions

  • the present invention relates to a protective sheath for an articulated joint of a propeller shaft, with integrated clamping device.
  • the described tightening device can be adapted to all types of protective sleeves, for example to those used for steering racks or for mechanical transmission members found in the navy.
  • the protective sheaths for universal joints or constant velocity joints serve, on the one hand, to protect the joints and articulations against foreign bodies, shocks and other external elements and, on the other hand, to contain in a leaktight manner the lubricating mass of which the articulated joint needs to function in good conditions.
  • These sheaths generally consist of a conical tubular bellows made of flexible elastomer, usually molded in one piece, formed of a central part with undulations allowing the bending and the axial extension of the body, and of two ends comprising one and the other of the cylindrical fixing zones with an internal diameter allowing their connection to the corresponding elements of the articulated joint.
  • the installation of the sheaths is, in particular for the replacement of faulty parts, often carried out using a hollow cone whose base is arranged around the "bowl "(larger diameter element) of the articulated joint, and over which the sheath is slid by forcing so as to cause a radial stretch sufficient to position its widest end on the periphery of said" bowl ", and the further end small diameter on the drive shaft. Arriving at the end of the cone, the sheath suddenly retracts to position itself on the right side of the bowl.
  • patent No. FR 2,727,644 which describes a tool for the installation of protective sheaths for articulated rotary joints consisting of a hollow cone, the base of which can be enlarged as required by by means of a series of frustoconical rings mounted on said cone and the dimensions of which correspond to the different diameters of the articulated joints to be fitted with a protective sheath.
  • Maintaining and sealing the protective sheaths is most often ensured by means of non-integrated clamps intended to be mounted at the two ends of the bellows in grooves provided for this purpose. After fitting the sheath, these collars are positioned in the appropriate locations and tightened using a manual or mechanical tool.
  • the duration of these operations can be relatively long due, in particular, to the difficulty of access to the transmission members.
  • the clamping force applied to the clamps is generally not checked, which, in the event of an incorrect value, can lead to a decrease in reliability and the duration of assembly.
  • the internal pressure of the bellows must be equal to atmospheric pressure, especially for systems with rapid cone mounting which must be very flexible. Indeed higher pressure causes swelling, and the reverse a contraction of the bellows, causing in both cases its premature wear. This occurs in particular when the installer forgets to perform a venting before tightening the collars.
  • the device according to the present invention aims to remedy this state of affairs. It makes it possible to produce protective sheaths for transmission shaft seals equipped with integrated clamping means and comprising an automatic venting system.
  • a conical sheath with a flexible elastomer bellows comprising, at least at one of its ends and possibly at both ends, an integrated elastomer clamping means, molded in a single operation with the sheath, place without tools and whose clamping force is independent of the operating mode of the fitter ensuring the establishment, said sheath being provided with one or more vents operating automatically ensuring the venting of the interior bellows before being closed by the clamping system.
  • FIG. 1 represents, seen from the side, a protective sheath with tightening means made up of cylindrical rings
  • the figures 2 and 3 are enlargements in axial section of the detail Dl of FIG. 1 showing cylindrical clamping rings of different thicknesses
  • FIGS. 4 to 6 represent, under the same conditions, different positions of a cylindrical clamping ring during its set up
  • Figure 7 is an enlargement of the detail D2 of Figure 6 showing a blocking device clamping ring formed by a rib which can be embedded in a groove
  • FIGS. 1 represents, seen from the side, a protective sheath with tightening means made up of cylindrical rings
  • the figures 2 and 3 are enlargements in axial section of the detail Dl of FIG. 1 showing cylindrical clamping rings of different thicknesses
  • FIGS. 4 to 6 represent, under the same conditions, different positions of a cylindrical clamping ring during its set up
  • Figure 7 is an enlargement of the detail D2 of Figure 6 showing a blocking device clamping ring formed by a
  • FIG. 8 shows, under the same conditions, a configuration of the clamping device adapted to an articulated joint comprising a stop groove for a protective sheath
  • FIG. 9 shows the same configuration mounted on an articulated joint without stop groove
  • FIG. 10 is a partial view showing, seen from the side, the part of smaller diameter of a protective sheath equipped with a clamping system consisting of a suitable tongue to surround the cylindrical fixing zone of the sheath
  • FIGS. 11 and 12 are end views along the arrow FI of FIG. 10 showing respectively the tightening tab before and after installation and a vent successively opened and closed by the pressure of said tab.
  • the device consists of a conical sheath or sleeve made of a flexible material of the elastomer type resistant to lubricants and comprising three parts: two cylindrical ends 1, 2 enabling the said sleeve to be fixed in leaktight manner on each of the two parts of the articulated joint, and a central bellows 3 which is deformable and extensible, the assembly being filled with grease intended to lubricate the mechanical elements of the articulated joint.
  • the ends 1, 2 respectively form large and small diameter fixing zones intended to be applied respectively to the "bowl” 4 (element of larger diameter) of the articulated joint, and to the transmission shaft.
  • the sheaths according to the invention do not require any separate clamp.
  • the usual devices are replaced by elastomer elements integrated into the protective sheath. These elements may take various shapes and will be provided at least at one of the cylindrical ends 1, 2.
  • the clamping element (s) consist of cylindrical rings 5, 6 molded in one piece with the sheath, extending the cylindrical end (s) 1,2 and connected to those -ci by annular elements 7, 8 thinned playing the role of hinge and allowing to fold the clamping ring 5, 6 on the corresponding cylindrical end 1, 2.
  • the clamping force can be adapted to requirements by varying the thickness E of the clamping ring, and the difference between the internal radii RI of the cylindrical end 1, 2 and R2 of the clamping ring 5, 6.
  • each clamping ring is folded over the corresponding cylindrical end 1, 2 using one or more pullers 9 forming part of said rings, or other suitable devices to perform the same function.
  • the integrated elastomer clamping rings tend to remain in place, even at high rotational speed, they can advantageously be provided with a positive locking system consisting for example of ribs 10 associated with grooves 11 arranged one on the cylindrical end 1, 2 of the sheath, the other on the corresponding clamping ring 5, 6 ( Figures 7, 8, 9). It is also possible to use a separate locking collar (not shown) mounted on the folded clamping rings, guided by annular beads 12 possibly provided on the latter. (figure 7).
  • the protective sheaths must be capable of being mounted on "bowls" 4, 4 'of smooth articulated joint or stop groove 13 intended to prevent any axial displacement of the protective sheath.
  • the locking system can be arranged so as to improve the attachment in the stop groove when it exists ( Figure 8), while s' collapsing in case of smooth "bowl” ( Figure 9).
  • the cylindrical end of large diameter 1 may include an annular fold 14 in 'V or trapezoid, with concavity directed towards the outside, of the type described in patent N ° FR 2,729,725, and determined to be able insert into the stop groove 13 of the "bowl" 4.
  • the clamping ring 5 may advantageously be provided with a rib 10 'determined to be inserted into the annular fold 14 while increasing its effectiveness when the "bowl" has a stop groove.
  • the same device can be provided at the cylindrical end of small diameter 2, certain shafts also comprising stop grooves.
  • the clamping element or elements consist of tongues 13 molded in one piece with the sheath and arranged to be able to surround the cylindrical ends 1, 2 of the sheath, these being possibly provided with lateral guide ribs 15 similar to those usually used for non-integrated clamps.
  • the tongues will comprise a locking means consisting for example of one or more perforations 16 arranged at the end, associated with at least one "button” or rivet 17 secured to the cylindrical end 1, 2, or also balls or devices d 'appropriately shaped stop integral with the tongue 13, the assembly can be arranged so that the end of the tongue is passed under itself to ensure locking.
  • clamping devices described above can be adapted to protective sheaths of the so-called “universal” type, that is to say comprising at one or both ends, cylindrical fixing rings multiple steps, allowing the use of the same sheath for several articulated joints of different dimensions.
  • This venting system may for example be in the form of tubular perforations formed in the thickness of the wall of the cylindrical end, or one or more axial folds 18 (FIG. 11) with thickness of constant wall to avoid weakening of the sheath when passing over the installation cone, this or these folds leaving as many channels between the sheath and the shaft of the transmission member.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)

Abstract

The invention concerns a protective sheath consisting of a conical sleeve with bellows (3) made of pliable elastomer comprising, at least at one of its ends incorporated clamping means made of elastomer, moulded in one single operation with the sheath, capable of being fixed without using tools and whereof the clamping force is independent of the manner used by the operator for mounting it, said clamping means being for example formed by a ring (5) extending the corresponding cylindrical end (1) of the sheath and capable of being folded down on said cylindrical end. The device is particularly designed for lubricated joints such as cardan links or constant velocity joints used in new or second-hand vehicles.

Description

GAINE PROTECTRICE POUR JOINT ARTICULÉ D'ARBRE DE TRANSMISSION A DISPOSITIF DE SERRAGE INTÉGRÉ PROTECTIVE SHEATH FOR ARTICULATED TRANSMISSION SHAFT SEAL WITH INTEGRATED TIGHTENING DEVICE
La présente invention a pour objet une gaine protectrice pour joint articulé d'arbre de transmission, à dispositif de serrage intégré.The present invention relates to a protective sheath for an articulated joint of a propeller shaft, with integrated clamping device.
Elle est destinée à la protection des joints lubrifiés de type "cardan" ou homocinétiques utilisés pour transmettre un mouvement de rotation à des organes mobiles, en particulier dans le domaine des véhicules routiers automobiles, et concerne aussi bien l'équipement des véhicules neufs de tous types, que le secteur industriel de la fabrication de pièces de rechange pour ateliers de réparation et de maintenance des voitures ou poids lourds. Le dispositif de serrage décrit peut être adapté à tous les types de manchons de protection, par exemple à ceux utilisés pour les crémaillères de direction ou pour les organes mécaniques de transmission que l'on trouve dans la marine.It is intended for the protection of lubricated joints of the "cardan" or constant velocity type used to transmit a rotational movement to moving parts, in particular in the field of road motor vehicles, and relates equally to the equipment of new vehicles of all types, that the industrial sector of the manufacture of spare parts for repair workshops and maintenance of cars or trucks. The described tightening device can be adapted to all types of protective sleeves, for example to those used for steering racks or for mechanical transmission members found in the navy.
Les gaines de protection pour cardans de transmissions ou joints homocinétiques servent, d'une part, à protéger les joints et articulations contre les corps étrangers, chocs et autres éléments extérieurs et, d'autre part, à contenir de manière étanche la masse lubrifiante dont le joint articulé a besoin pour fonctionner dans de bonnes conditions . Ces gaines sont généralement constituées d'un soufflet tubulaire conique en élastomère souple, habituellement moulé en une seule pièce, formé d'une partie centrale avec ondulations permettant la flexion et l'extension axiale du corps, et de deux extrémités comportant l'une et l'autre des zones de fixations cylindriques avec un diamètre intérieur permettant leur raccordement sur les éléments correspondants du joint articulé . Afin d'éviter le démontage de l'organe de transmission, la mise en place des gaines est, en particulier pour le remplacement des pièces défaillantes, souvent réalisée à l'aide d'un cône creux dont la base est disposée autour du "bol" (élément de plus grand diamètre) du joint articulé, et sur lequel la gaine est glissée en forçant de manière à provoquer un étirement radial suffisant pour positionner son extrémité la plus large sur la périphérie dudit "bol", et l'extrémité de plus faible diamètre sur l'arbre de transmission. Arrivée à l'extrémité du cône, la gaine se rétracte brutalement pour se positionner du bon côté du bol.The protective sheaths for universal joints or constant velocity joints serve, on the one hand, to protect the joints and articulations against foreign bodies, shocks and other external elements and, on the other hand, to contain in a leaktight manner the lubricating mass of which the articulated joint needs to function in good conditions. These sheaths generally consist of a conical tubular bellows made of flexible elastomer, usually molded in one piece, formed of a central part with undulations allowing the bending and the axial extension of the body, and of two ends comprising one and the other of the cylindrical fixing zones with an internal diameter allowing their connection to the corresponding elements of the articulated joint. In order to avoid disassembly of the transmission member, the installation of the sheaths is, in particular for the replacement of faulty parts, often carried out using a hollow cone whose base is arranged around the "bowl "(larger diameter element) of the articulated joint, and over which the sheath is slid by forcing so as to cause a radial stretch sufficient to position its widest end on the periphery of said" bowl ", and the further end small diameter on the drive shaft. Arriving at the end of the cone, the sheath suddenly retracts to position itself on the right side of the bowl.
A titre d'exemple, on peut citer le brevet N° FR 2 727 644 qui décrit un outillage pour la mise en place des gaines de protection pour joints rotatifs articulés constitué d'un cône creux dont la base peut être agrandie selon les besoins au moyen d'une série de bagues tronconiques se montant sur ledit cône et dont les dimensions correspondent aux différents diamètres des joints articulés devant être équipés d'une gaine de protection.By way of example, mention may be made of patent No. FR 2,727,644 which describes a tool for the installation of protective sheaths for articulated rotary joints consisting of a hollow cone, the base of which can be enlarged as required by by means of a series of frustoconical rings mounted on said cone and the dimensions of which correspond to the different diameters of the articulated joints to be fitted with a protective sheath.
Le maintien et l'étanchéité des gaines de protection sont le plus souvent assurés au moyen de colliers de serrage non intégrés destinés à être montés aux deux extrémités des soufflets dans des gorges prévues à cet effet. Après mise en place de la gaine, ces colliers sont positionnés aux emplacements adéquats et serrés à l'aide d'un outil à fonctionnement manuel ou mécanique. La durée de ces opérations peut être relativement importante en raison, en particulier, de la difficulté d'accès aux organes de transmission. En outre, la force de serrage appliquée aux colliers n'est généralement pas vérifiée, ce qui, en cas de valeur incorrecte, peut entraîner une diminution de la fiabilité et de la durée du montage.Maintaining and sealing the protective sheaths is most often ensured by means of non-integrated clamps intended to be mounted at the two ends of the bellows in grooves provided for this purpose. After fitting the sheath, these collars are positioned in the appropriate locations and tightened using a manual or mechanical tool. The duration of these operations can be relatively long due, in particular, to the difficulty of access to the transmission members. In addition, the clamping force applied to the clamps is generally not checked, which, in the event of an incorrect value, can lead to a decrease in reliability and the duration of assembly.
Par ailleurs, la pression interne du soufflet doit être égale à la pression atmosphérique, surtout pour les systèmes à montage rapide par cône qui doivent être très souples. En effet une pression plus élevée provoque un gonflement, et l'inverse une contraction du soufflet, entraînant dans les deux cas son usure prématurée . Cela se produit en particulier lorsque le monteur oublie d'effectuer une mise à l'air libre avant serrage des colliers.Furthermore, the internal pressure of the bellows must be equal to atmospheric pressure, especially for systems with rapid cone mounting which must be very flexible. Indeed higher pressure causes swelling, and the reverse a contraction of the bellows, causing in both cases its premature wear. This occurs in particular when the installer forgets to perform a venting before tightening the collars.
Le dispositif selon la présente invention a pour objectif de remédier à cet état de choses. Il permet en effet de réaliser des gaines protectrices pour joints d'arbre de transmission équipée de moyens de serrage intégrés et comportant un système de mise à l'air libre automatique .The device according to the present invention aims to remedy this state of affairs. It makes it possible to produce protective sheaths for transmission shaft seals equipped with integrated clamping means and comprising an automatic venting system.
Il est constitué d'une gaine conique à soufflet en élastomère souple comportant, au moins à l'une de ses extrémités et éventuellement aux deux extrémités, un moyen de serrage intégré en élastomère, moulé en une seule opération avec la gaine, se mettant en place sans outillage et dont la force de serrage est indépendante de la façon d'opérer du monteur assurant la mise en place, ladite gaine étant pourvue d'un ou plusieurs évents à fonctionnement automatique assurant la mise à l'air libre de l'intérieur du soufflet avant d'être obturé par le système de serrage.It consists of a conical sheath with a flexible elastomer bellows comprising, at least at one of its ends and possibly at both ends, an integrated elastomer clamping means, molded in a single operation with the sheath, place without tools and whose clamping force is independent of the operating mode of the fitter ensuring the establishment, said sheath being provided with one or more vents operating automatically ensuring the venting of the interior bellows before being closed by the clamping system.
Sur les dessins annexés, donnés à titre d'exemples non limitatifs de formes de réalisation de l'objet de l'invention: la figure 1 représente, vue de côté, une gaine de protection avec moyens de serrage constitués de bagues cylindriques, les figures 2 et 3 sont des agrandissements en coupe axiale du détail Dl de la figure 1 montrant des bagues cylindriques de serrage d'épaisseurs différentes, les figures 4 à 6 représentent dans les mêmes conditions différentes positions d'une bague cylindrique de serrage au cours de sa mise en place, la figure 7 est un agrandissement du détail D2 de la figure 6 représentant un dispositif de blocage de bague de serrage formé d'une nervure pouvant s'encastrer dans une rainure, la figures 8 montre dans les mêmes conditions une configuration du dispositif de serrage adapté à un joint articulé comportant une gorge d'arrêt pour gaine protectrice, la figure 9 représente la même configuration montée sur un joint articulé sans gorge d'arrêt, la figure 10 est une vue partielle montrant, vue de côté, la partie de plus faible diamètre d'une gaine de protection équipée d'un système de serrage consistant en une languette apte à entourer la zone de fixation cylindrique de la gaine et les figures 11 et 12 sont des vues en bout suivant la flèche FI de la figure 10 montrant respectivement la languette de serrage avant et après mise en place et un évent successivement ouvert et fermé par la pression de ladite languette.In the accompanying drawings, given by way of nonlimiting examples of embodiments of the subject of the invention: FIG. 1 represents, seen from the side, a protective sheath with tightening means made up of cylindrical rings, the figures 2 and 3 are enlargements in axial section of the detail Dl of FIG. 1 showing cylindrical clamping rings of different thicknesses, FIGS. 4 to 6 represent, under the same conditions, different positions of a cylindrical clamping ring during its set up, Figure 7 is an enlargement of the detail D2 of Figure 6 showing a blocking device clamping ring formed by a rib which can be embedded in a groove, FIGS. 8 shows, under the same conditions, a configuration of the clamping device adapted to an articulated joint comprising a stop groove for a protective sheath, FIG. 9 shows the same configuration mounted on an articulated joint without stop groove, FIG. 10 is a partial view showing, seen from the side, the part of smaller diameter of a protective sheath equipped with a clamping system consisting of a suitable tongue to surround the cylindrical fixing zone of the sheath and FIGS. 11 and 12 are end views along the arrow FI of FIG. 10 showing respectively the tightening tab before and after installation and a vent successively opened and closed by the pressure of said tab.
Le dispositif, figures 1 à 12, est constitué d'une gaine ou manchon conique réalisé dans un matériau souple de type élastomère résistant aux lubrifiants et comportant trois parties : deux extrémités 1, 2 cylindriques permettant de fixer de manière étanche ledit manchon sur chacune des deux parties du joint articulé, et un soufflet 3 central déformable et extensible, l'ensemble étant rempli de graisse destinée à lubrifier le éléments mécaniques du joint articulé.The device, FIGS. 1 to 12, consists of a conical sheath or sleeve made of a flexible material of the elastomer type resistant to lubricants and comprising three parts: two cylindrical ends 1, 2 enabling the said sleeve to be fixed in leaktight manner on each of the two parts of the articulated joint, and a central bellows 3 which is deformable and extensible, the assembly being filled with grease intended to lubricate the mechanical elements of the articulated joint.
Les extrémités 1, 2 forment respectivement des zones de fixation de grand et de petit diamètre destinées à être appliquées respectivement sur le "bol" 4 (élément de plus grand diamètre) du joint articulé, et sur l'arbre de transmission.The ends 1, 2 respectively form large and small diameter fixing zones intended to be applied respectively to the "bowl" 4 (element of larger diameter) of the articulated joint, and to the transmission shaft.
Les gaines selon l'invention ne nécessitent aucun collier de serrage séparé. Les dispositifs habituels sont remplacés par des éléments d' élastomère intégrés à la gaine de protection. Ces éléments peuvent revêtir des formes diverses et seront prévus au moins à l'une des extrémités cylindriques 1, 2.The sheaths according to the invention do not require any separate clamp. The usual devices are replaced by elastomer elements integrated into the protective sheath. These elements may take various shapes and will be provided at least at one of the cylindrical ends 1, 2.
Selon un mode de réalisation préférentiel (figures 1 à 9), le ou les éléments de serrage sont constitués de bagues cylindriques 5, 6 moulées d'une seule pièce avec la gaine, prolongeant la ou les extrémités cylindriques 1,2 et reliées à celles-ci par des éléments annulaires 7, 8 amincis jouant le rôle de charnière et permettant de rabattre la bague de serrage 5, 6 sur l'extrémité cylindrique 1, 2 correspondante. La force de serrage peut être adaptée aux besoins en jouant sur l'épaisseur E de la bague de serrage, et la différence entre les rayons intérieurs RI de l'extrémité cylindrique 1, 2 et R2 de la bague de serrage 5, 6.According to a preferred embodiment (Figures 1 to 9), the clamping element (s) consist of cylindrical rings 5, 6 molded in one piece with the sheath, extending the cylindrical end (s) 1,2 and connected to those -ci by annular elements 7, 8 thinned playing the role of hinge and allowing to fold the clamping ring 5, 6 on the corresponding cylindrical end 1, 2. The clamping force can be adapted to requirements by varying the thickness E of the clamping ring, and the difference between the internal radii RI of the cylindrical end 1, 2 and R2 of the clamping ring 5, 6.
Les éléments annulaires 7, 8 amincis ne sont pas indispensables et peuvent être supprimés, ou éventuellement être remplacés par des bourrelets . Après mise en position du manchon de protection sur le joint articulé, chaque bague de serrage est rabattue sur l'extrémité cylindrique 1, 2 correspondante à l'aide d'une ou plusieurs tirettes 9 faisant partie desdites bagues, ou d'autres dispositifs aptes à assurer la même fonction. Bien que les bagues de serrage intégrées en élastomère aient tendance à rester en place, même à grande vitesse de rotation, elles pourront avantageusement être pourvues d'un système de blocage positif constitué par exemple de nervures 10 associées à des rainures 11 aménagées l'une sur l'extrémité cylindrique 1, 2 de la gaine, l'autre sur la bague de serrage 5, 6 correspondante (figures 7, 8, 9). Il est également possible d'utiliser un collier de blocage séparé (non représenté) se montant sur les bagues de serrage rabattues , guidés par des bourrelets annulaires 12 éventuellement prévus sur ces dernières. ( figure 7 ) .The thinned annular elements 7, 8 are not essential and can be removed, or possibly replaced by beads. After positioning the protective sleeve on the articulated joint, each clamping ring is folded over the corresponding cylindrical end 1, 2 using one or more pullers 9 forming part of said rings, or other suitable devices to perform the same function. Although the integrated elastomer clamping rings tend to remain in place, even at high rotational speed, they can advantageously be provided with a positive locking system consisting for example of ribs 10 associated with grooves 11 arranged one on the cylindrical end 1, 2 of the sheath, the other on the corresponding clamping ring 5, 6 (Figures 7, 8, 9). It is also possible to use a separate locking collar (not shown) mounted on the folded clamping rings, guided by annular beads 12 possibly provided on the latter. (figure 7).
Les gaines de protection doivent pouvoir être montées sur des "bols" 4, 4' de joint articulé lisses ou à gorge d'arrêt 13 destinée à empêcher tout déplacement axial de la gaine de protection. Le système de blocage peut être disposé de façon à améliorer l'accrochage dans la gorge d'arrêt lorsqu'elle existe (figure 8), tout en s 'écrasant en cas de "bol" lisse (figure 9). A cet effet, l'extrémité cylindrique de fort diamètre 1 pourra comporter un pli annulaire 14 en 'V ou en trapèze, à concavité dirigée vers l'extérieur, du type décrit dans le brevet N° FR 2 729 725, et déterminé pour pouvoir s'insérer dans la gorge 13 d'arrêt du "bol" 4. La bague de serrage 5 pourra avantageusement être pourvue d'une nervure 10' déterminée pour s'insérer dans le pli annulaire 14 en renforçant son efficacité lorsque le "bol" comporte une gorge d'arrêt. Le même dispositif peut être prévu à l'extrémité cylindrique de faible diamètre 2, certains arbres comportant également des gorges d'arrêt.The protective sheaths must be capable of being mounted on "bowls" 4, 4 'of smooth articulated joint or stop groove 13 intended to prevent any axial displacement of the protective sheath. The locking system can be arranged so as to improve the attachment in the stop groove when it exists (Figure 8), while s' collapsing in case of smooth "bowl" (Figure 9). For this purpose, the cylindrical end of large diameter 1 may include an annular fold 14 in 'V or trapezoid, with concavity directed towards the outside, of the type described in patent N ° FR 2,729,725, and determined to be able insert into the stop groove 13 of the "bowl" 4. The clamping ring 5 may advantageously be provided with a rib 10 'determined to be inserted into the annular fold 14 while increasing its effectiveness when the "bowl" has a stop groove. The same device can be provided at the cylindrical end of small diameter 2, certain shafts also comprising stop grooves.
Selon une variante de réalisation (figures 10 à 12 ) , le ou les éléments de serrage sont constitués de languettes 13 moulées d'une pièce avec la gaine et agencées pour pouvoir entourer les extrémités cylindriques 1, 2 de la gaine, celles-ci étant éventuellement pourvues de nervures de guidage latérales 15 semblables à celles habituellement utilisées pour les colliers de serrage non intégrés . Les languettes comporteront un moyen de blocage consistant par exemple en une ou plusieurs perforations 16 disposées à l'extrémité, associée à au moins un "bouton" ou rivet 17 solidaire de l'extrémité cylindrique 1, 2, ou encore des boules ou dispositifs d'arrêt de forme appropriée solidaires de la languette 13, l'ensemble pouvant être agencé de manière à ce que l'extrémité de la languette soit passée sous elle-même pour assurer le blocage.According to an alternative embodiment (Figures 10 to 12), the clamping element or elements consist of tongues 13 molded in one piece with the sheath and arranged to be able to surround the cylindrical ends 1, 2 of the sheath, these being possibly provided with lateral guide ribs 15 similar to those usually used for non-integrated clamps. The tongues will comprise a locking means consisting for example of one or more perforations 16 arranged at the end, associated with at least one "button" or rivet 17 secured to the cylindrical end 1, 2, or also balls or devices d 'appropriately shaped stop integral with the tongue 13, the assembly can be arranged so that the end of the tongue is passed under itself to ensure locking.
Les dispositifs de serrage décrits ci-avant peuvent être adaptés à des gaines de protection de type dit "universel", c'est à dire comportant à l'une ou aux deux extrémités, des bagues cylindriques de fixation multiples en gradin, permettant d'utiliser une même gaine pour plusieurs joints articulés de dimensions différentes.The clamping devices described above can be adapted to protective sheaths of the so-called "universal" type, that is to say comprising at one or both ends, cylindrical fixing rings multiple steps, allowing the use of the same sheath for several articulated joints of different dimensions.
Afin d'assurer une pression égale à la pression atmosphérique à l'intérieur de la gaine, de manière à éviter à cette dernière un gonflement ou une contraction risquant d'entraîner une usure rapide, il sera avantageusement prévu, de préférence sur l'extrémité cylindrique de petit diamètre 2, un ou plusieurs évents de mise à l'air libre conçu pour être automatiquement obturé par écrasement par la mise en place du dispositif de serrage 5, 6, 13.In order to ensure a pressure equal to atmospheric pressure inside the sheath, so as to avoid swelling or contraction which risks causing rapid wear, it will advantageously be provided, preferably on the end cylindrical small diameter 2, one or more air vents designed to be automatically closed by crushing by the installation of the clamping device 5, 6, 13.
Ce système de mise à l'air libre peut se présenter par exemple sous la forme de perforations tubulaires ménagées dans l'épaisseur de la paroi de l'extrémité cylindrique, ou d'un ou plusieurs plis axiaux 18 (figure 11) avec épaisseur de paroi constante pour éviter l'affaiblissement de la gaine lors du passage sur cône de mise en place, ce ou ces plis ménageant autant de canaux entre la gaine et l'arbre de l'organe de transmission.This venting system may for example be in the form of tubular perforations formed in the thickness of the wall of the cylindrical end, or one or more axial folds 18 (FIG. 11) with thickness of constant wall to avoid weakening of the sheath when passing over the installation cone, this or these folds leaving as many channels between the sheath and the shaft of the transmission member.
Le positionnement des divers éléments constitutifs donne à l'objet de l'invention un maximum d'effets utiles qui n'avaient pas été, à ce jour, obtenus par des dispositifs similaires. The positioning of the various constituent elements gives the object of the invention a maximum of useful effects which had not, to date, been obtained by similar devices.

Claims

REVENDICATIONS
1°. Gaine protectrice pour joint articulé d'arbre de transmission à dispositif de serrage intégré, du type conique à soufflet (3) en élastomère souple comportant deux extrémités cylindriques (1, 2) ou en gradins, destinée en particulier aux joints lubrifiés de type "cardan" ou homocinétiques utilisés dans le domaine des véhicules routiers automobiles neufs ou usagés, mais s 'appliquant également à tous les types de manchons de protection pour organes mécaniques de transmission, caractérisée en ce qu'elle comporte au moins à l'une de ses extrémités un moyen de serrage intégré en élastomère (5, 6, 13), moulé en une seule opération avec ladite gaine, se mettant en place sans outillage et dont la force de serrage est indépendante des actions de l'opérateur assurant la mise en place.1 °. Protective sheath for articulated drive shaft seal with integrated clamping device, of the conical bellows type (3) made of flexible elastomer having two cylindrical ends (1, 2) or in steps, intended in particular for lubricated joints of the "cardan" type "or homokinetic used in the field of new or used road motor vehicles, but also applying to all types of protective sleeves for mechanical transmission members, characterized in that it comprises at least at one of its ends a clamping means integrated in elastomer (5, 6, 13), molded in a single operation with said sheath, being put in place without tools and whose clamping force is independent of the actions of the operator ensuring the establishment.
2°. Gaine protectrice selon la revendication2 °. Protective sheath according to claim
1, se caractérisant par le fait que chaque éléments de serrage est constitué d'une bague (5, 6) cylindrique moulée d'une seule pièce avec la gaine, prolongeant l'extrémité cylindrique (1,2) correspondante et apte à être rabattue sur ladite extrémité cylindrique.1, characterized in that each clamping element consists of a cylindrical ring (5, 6) molded in one piece with the sheath, extending the corresponding cylindrical end (1,2) and able to be folded down on said cylindrical end.
3°. Gaine protectrice selon la revendication3 °. Protective sheath according to claim
2, se caractérisant par le fait que l'épaisseur (E) de la bague (5, 6) de serrage, et la différence entre les rayons intérieurs (RI, R2 ) de l'extrémité cylindrique (1, 2) et de la bague de serrage (5, 6) sont choisis en fonction de la force de serrage à obtenir.2, characterized by the fact that the thickness (E) of the clamping ring (5, 6), and the difference between the internal radii (RI, R2) of the cylindrical end (1, 2) and of the clamping ring (5, 6) are chosen according to the clamping force to be obtained.
4°. Gaine protectrice selon l'une quelconque des revendications 2 et 3 , se caractérisant par le fait que chaque bague (5, 6) de serrage comporte une ou plusieurs tirettes (9) ou éléments similaires faisant partie de ladite bague et permettant de la rabattre aisément sur l'extrémité cylindrique (1, 2). 5°. Gaine protectrice selon l'une quelconque des revendications 2 à 4 , se caractérisant par le fait que chaque bague (5, 6) de serrage est pourvue d'un système de blocage positif constitué d'au moins une nervure (10) associée à au moins une rainure (11) aménagées l'une sur l'extrémité cylindrique (1, 2) de la gaine, l'autre sur la bague (5, 6) de serrage correspondante.4 °. Protective sheath according to any one of claims 2 and 3, characterized in that each clamping ring (5, 6) comprises one or more pulls (9) or similar elements forming part of said ring and allowing it to be folded down easily on the cylindrical end (1, 2). 5 °. Protective sheath according to any one of claims 2 to 4, characterized in that each clamping ring (5, 6) is provided with a positive locking system consisting of at least one rib (10) associated with the at least one groove (11) arranged one on the cylindrical end (1, 2) of the sheath, the other on the corresponding clamping ring (5, 6).
6°. Gaine protectrice selon l'une quelconque des revendications 2 à 5, se caractérisant par le fait qu'au moins une extrémité cylindrique (1, 2) comporte un pli annulaire (14) en "V" ou en trapèze, à concavité dirigée vers l'extérieur, et déterminé pour pouvoir s'insérer dans une gorge d'arrêt (13) périphérique présente sur les constituants de certains joints articulés, la bague (5, 6) de serrage étant pourvue d'une nervure (10') déterminée pour s'insérer dans le pli annulaire (14) en renforçant son efficacité, ledit pli annulaire et ladite nervure étant agencés pour pouvoir s'écraser sur les constituants des joints articulés ne comportant pas de gorge d'arrêt.6 °. Protective sheath according to any one of Claims 2 to 5, characterized in that at least one cylindrical end (1, 2) has an annular fold (14) in a "V" or trapezoidal shape, with a concavity directed towards the exterior, and determined to be able to be inserted in a peripheral stop groove (13) present on the constituents of certain articulated joints, the clamping ring (5, 6) being provided with a rib (10 ') determined for insert into the annular fold (14) by increasing its efficiency, said annular fold and said rib being arranged so as to be able to be crushed on the constituents of the articulated joints not comprising a stop groove.
7°. Gaine protectrice selon la revendication 1, se caractérisant par le fait que chaque éléments de serrage est constitué d'une languettes (13) moulées d'une seule pièce avec la gaine et agencée pour pouvoir entourer une extrémités cylindrique (1, 2) de ladite gaine, cette languette comportant un moyen de blocage tel qu'une plusieurs perforations (16) disposée(s) à l'une de ses extrémités libre associée à un ou plusieurs "bouton(s)" ou rivet (s) (17) ou dispositifs d'arrêt de forme appropriée disposés à l'autre extrémité et passant en force dans la ou les perforations .7 °. Protective sheath according to claim 1, characterized in that each clamping element consists of a tongues (13) molded in one piece with the sheath and arranged to be able to surround a cylindrical end (1, 2) of said sheath, this tongue comprising a locking means such as a plurality of perforations (16) disposed at one of its free ends associated with one or more "button (s)" or rivet (s) (17) or appropriately shaped stop devices arranged at the other end and forcing into the perforation (s).
8°. Gaine protectrice selon la revendication 7, se caractérisant par le fait que l'extrémité cylindrique (1, 2) est pourvue de nervures de guidage latérales (15) semblables à celles habituellement utilisées pour les colliers de serrage non intégrés.8 °. Protective sheath according to claim 7, characterized in that the cylindrical end (1, 2) is provided with guide ribs side (15) similar to those usually used for non-integrated cable ties.
9°. Gaine protectrice selon l'une quelconque des revendications précédentes, se caractérisant par le fait qu'elle est pourvue d'au moins un évent à fonctionnement automatique assurant la mise a l'air libre de l'intérieur du soufflet (3) avant d'être obturé par le système de serrage.9 °. Protective sheath according to any one of the preceding claims, characterized in that it is provided with at least one automatically operating vent ensuring the venting of the interior of the bellows (3) before be closed by the clamping system.
10°. Gaine protectrice selon la revendication 9, se caractérisant par le fait que le système de mise à l'air libre est constitué d'au moins un canal axial formé d'une perforation tubulaire ménagée dans l'épaisseur de la paroi de l'extrémité cylindrique (2) de plus faible diamètre ou d'au moins un pli (18) de cette extrémité cylindrique avec épaisseur de paroi constante formant un canal entre la gaine protectrice et l'arbre de l'organe de transmission. 10 °. Protective sheath according to claim 9, characterized in that the venting system consists of at least one axial channel formed by a tubular perforation formed in the thickness of the wall of the cylindrical end (2) of smaller diameter or at least one fold (18) of this cylindrical end with constant wall thickness forming a channel between the protective sheath and the shaft of the transmission member.
PCT/FR1998/002366 1998-11-05 1998-11-05 Protective sheath for drive shaft cardan link with incorporated clamping device WO2000028228A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/FR1998/002366 WO2000028228A1 (en) 1998-11-05 1998-11-05 Protective sheath for drive shaft cardan link with incorporated clamping device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR1998/002366 WO2000028228A1 (en) 1998-11-05 1998-11-05 Protective sheath for drive shaft cardan link with incorporated clamping device

Publications (1)

Publication Number Publication Date
WO2000028228A1 true WO2000028228A1 (en) 2000-05-18

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5078652A (en) * 1990-06-14 1992-01-07 Wynn's-Precision, Inc. Convoluted boot and seal
EP0464984A1 (en) * 1990-06-30 1992-01-08 Draftex Industries Limited Flexible protective bellows
FR2729725A1 (en) * 1995-01-24 1996-07-26 Yamajany Snc FLEXIBLE PROTECTIVE SHEATH FOR ARTICULATED ROTARY JOINTS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5078652A (en) * 1990-06-14 1992-01-07 Wynn's-Precision, Inc. Convoluted boot and seal
EP0464984A1 (en) * 1990-06-30 1992-01-08 Draftex Industries Limited Flexible protective bellows
FR2729725A1 (en) * 1995-01-24 1996-07-26 Yamajany Snc FLEXIBLE PROTECTIVE SHEATH FOR ARTICULATED ROTARY JOINTS

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