EP1697183A1 - Arrangement for a wiping mechanism guiding a drive shaft enabling the drive shaft to be retracted in case of impact - Google Patents

Arrangement for a wiping mechanism guiding a drive shaft enabling the drive shaft to be retracted in case of impact

Info

Publication number
EP1697183A1
EP1697183A1 EP04804082A EP04804082A EP1697183A1 EP 1697183 A1 EP1697183 A1 EP 1697183A1 EP 04804082 A EP04804082 A EP 04804082A EP 04804082 A EP04804082 A EP 04804082A EP 1697183 A1 EP1697183 A1 EP 1697183A1
Authority
EP
European Patent Office
Prior art keywords
shaft
housing
bulge
barrel
arrangement according
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP04804082A
Other languages
German (de)
French (fr)
Inventor
Jean-Pierre Eustache
Marcel Trebouet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Systemes dEssuyage SAS
Original Assignee
Valeo Systemes dEssuyage SAS
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 Valeo Systemes dEssuyage SAS filed Critical Valeo Systemes dEssuyage SAS
Publication of EP1697183A1 publication Critical patent/EP1697183A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
    • B60S1/34—Wiper arms; Mountings therefor
    • B60S1/3425—Constructional aspects of the arm
    • B60S1/3443—Wiper shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
    • B60S1/34—Wiper arms; Mountings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/0488—Wiper arrangement for crash protection or impact absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/16—Means for transmitting drive
    • B60S1/18—Means for transmitting drive mechanically
    • B60S1/24—Means for transmitting drive mechanically by rotary cranks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
    • B60S1/34—Wiper arms; Mountings therefor
    • B60S1/3488—Means for mounting wiper arms onto the vehicle
    • B60S1/3493—Means for mounting the wiper shaft in the wiper bearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
    • B60S1/34—Wiper arms; Mountings therefor
    • B60S1/3488—Means for mounting wiper arms onto the vehicle
    • B60S1/3495—Means for mounting the drive mechanism to the wiper shaft

Definitions

  • the invention provides an arrangement for guiding a pivoting shaft of a wiper mechanism drive, which clears the upper end of the shaft inside the engine compartment in the event of an impact.
  • the invention more particularly provides an arrangement for mounting and pivoting guiding around a generally vertical axis, relative to a body structure element of a motor vehicle, of a drive shaft of a mechanism wiper, an upper end of which is fixed to a wiping arm and the lower end of which is fixed to a crank of a transmission linkage, of the type which comprises a guide plate which is intended to be fixed to the body structure element and which comprises a cylindrical barrel in which the shaft is guided in pivoting.
  • the object of the invention is to propose an arrangement for guiding a drive shaft for which the means for retaining the shaft have a simplified structure.
  • the invention provides an arrangement of the type described above, characterized in that the shaft has a bulge which is received inside a complementary housing of the barrel, to block the moving shaft vertical with respect to the barrel, and which is capable of leaving the housing by elastic deformation of the bulge and / or of the housing, by an axial downward movement of the shaft relative to the barrel, when the wiping mechanism is subjected to a violent impact whose vertical component (F) is oriented downwards, the value of the component being greater than a determined threshold value.
  • the housing is made integrally with the barrel by molding an elastically deformable material;
  • the housing is made in a generally cylindrical ring coaxial with the shaft, which is made of an elastically deformable material, and which is received in a cavity of the barrel;
  • the cavity has a section of internal radial dimensions greater than the external radial dimensions of the ring, to allow an increase in the external diameter of the ring when the bulge comes out of the housing;
  • the section of the cavity is generally frustoconical in shape; - the bulge is made integrally with the tree; - bulge is an attached element which is fixed to the shaft;
  • the housing is arranged at the lower axial end of the barrel; - the bulge and the housing are generally spherical in shape; -
  • the housing is extended downwards by a conical annular portion coaxial with the shaft, the internal diameter of which increases downwards, forming a ramp; - The upper end of the shaft is fixed to the wiping arm by
  • FIG. 1 is a schematic representation in perspective and with cutaway of a arrangement for mounting a drive shaft comprising a bulge and a complementary housing in accordance with the invention
  • - Figures 2A and 2B are sections along the axis A of the arrangement shown in Figure 1, showing the relative positions of the drive shaft and the barrel, before and after the impact
  • - Figures 3A to 3C are details on a larger scale of different embodiments of the bulge
  • - Figures 4A and 4B are these views similar to the figures
  • FIG. 1 a plate 10 for guiding a drive shaft 12 12, pivoting about a vertical axis A.
  • the shaft 12 is an element of a wiping mechanism of a glazed panel of a motor vehicle (not shown), and it is intended to be connected at its upper end 12s to a wiping brush 14 (shown in the figures 4A, 4B) and at its lower end 12i to a crank 16 of a motion transmission linkage.
  • the plate 10 comprises a sole 18 for its attachment to a body structure element of the vehicle, and it comprises a cylindrical barrel 20 coaxial with the shaft 12 and the axis A.
  • the barrel 20 makes it possible to carry out the guiding in pivoting of the shaft 12.
  • its internal cylindrical wall 20i is complementary to the external cylindrical wall 12e of the shaft 12.
  • the barrel 20 has means 22 for locking the shaft 12 in axial downward movement .
  • These blocking means 22 of the shaft 12 also allow the shaft 12 to move axially downward relative to the barrel 20 when the wiping mechanism is subjected to a violent shock, the vertical component of which there is shown in the figures by the arrow F, is greater than a determined threshold value.
  • these locking means 22 include a bulge 24 which is integral with the shaft 12, and which is received in a complementary housing 26 26 of the barrel 20.
  • the bulge 24 and the housing 26 both have a symmetry of revolution about the vertical axis A, and according to a preferred embodiment, the bulge 24 and the housing 26 are spherical in shape.
  • the bulge 24 is carried by the shaft 12 and is arranged between the lower end 12i and the upper end 12s of the shaft 12. This means that the housing 26 is crossed by the shaft 12 and therefore that it is open at its upper and lower ends.
  • the upper opening of the housing 26 is complementary to the shaft 12, that is to say that its diameter is equal to the diameter of the shaft 12, and the lower opening of the housing 26 is designed so as to achieve the axial locking of the shaft 12 when the wiping mechanism is in normal conditions of use, and so as to allow the bulge 24 to exit during the impact.
  • the diameter of the lower opening is less than the largest diameter of the bulge 24, so as to achieve the axial locking of the bulge.
  • the diameter of the lower opening is greater than the diameter of the shaft 12.
  • the bulge 24 or the housing 26 is able to deform elastically upon impact.
  • the bulge 24 or the housing 26, respectively is made of an elastically deformable material whose elasticity characteristics are determined so that it deforms upon impact, and the diameter of the lower opening of the housing 26 is determined, as a function of the type of elastic material, and as a function of the threshold value of the vertical component of the shock.
  • it is the housing 26 which deforms upon impact.
  • Figures 1, 2A and 2B a first embodiment of the invention according to which the housing 26 is made integrally with the barrel 20.
  • the barrel 20 is thus made of an elastic material capable of being molded, in particular made of plastic.
  • the housing 26 is produced near the lower end 20i of the barrel 20.
  • the exit of the bulge 24 from the housing 26 corresponds to complete separation of the bulge 24 from the barrel 20 Therefore, the bulge 24 can no longer oppose the axial movement of the shaft 12 after the impact.
  • FIGS. 2A and 2B show the relative positions of the shaft 12 and the bulge 24 relative to the barrel 20 and to the housing 26 respectively before and after the impact. As can be seen in Figure 2A, when the bulge
  • the lower portion of the housing 26 makes it possible to retain the bulge axially, thus preventing the shaft 12 from moving axially downward with respect to in the barrel 20.
  • the wiping mechanism is subjected to a violent impact, this results in an effort to support the bulge 24 against the housing 26 whose amplitude makes it possible to cause the elastic deformation of the housing 26, and more particularly of the lower part of the housing 26.
  • the complementary spherical shapes of the bulge 24 and of the lower part of the housing 26 are in the form of ramps facing each other, so that a bearing force oriented axially towards the bottom of the bulge 24 on the housing 26 generates at any point of the lower part of the housing 26 a radial force oriented towards the outside.
  • the housing 26 widens so that the diameter of its lower opening becomes equal to the largest diameter of the bulge 24, to allow the bulge 24 to pass through this opening and to separate from the barrel 20.
  • the housing 26 and the barrel 20 return elastically to their initial shape, for which the diameter of the lower opening is less than the largest diameter of the bulge 24.
  • the use of an elastic material is advantageous for the production of the housing 26.
  • the housing 26 is made integrally with the barrel 20, this means that the plate 10 is also produced in this same elastic material.
  • the plate 10 is subjected to numerous variable mechanical stresses.
  • the fact that the plate 10 is made of an elastic material implies that the plate 10 can deform in a random manner, and therefore implies a bad sweeping of the arm relative to the area to be wiped.
  • the barrel 20 is made of a rigid material, for example aluminum, and the housing
  • the 26 is made in an insert 28 in the barrel 20 which is made of an elastically deformable material.
  • This insert here consists of a ring 28 generally cylindrical and coaxial with the axis A of the shaft 12. It is fixed to the lower end 20i of the barrel 20 by any known means, in particular by embedding.
  • the ring 28 comprises a cylindrical body 32 of revolution in which the housing 26 is produced, and a radial flange 34 which extends the lower end 32i body 32 radially outwards.
  • the lower end 20i of the barrel 20 has a cavity 30 coaxial with the axis A of the shaft 12 and which is open downwards.
  • the cavity 30 comprises an upper section 36 and a lower section 38 which respectively receive the body 32 and the flange 34 of the ring 28.
  • the flange 34 is received in the lower section 38 so as to achieve the axial positioning and the fixing of the ring 28 in the cavity 30.
  • the flange 34 is embedded inside the lower section 38.
  • the upper section 36 is of frustoconical shape, whose diameter at its lower end is greater than the diameter at its upper end.
  • the diameter of the upper section, at its upper end is generally equal to the outside diameter of the body 32 of the ring 28, to avoid any radial movement of the ring 28 in the cavity 30.
  • the bulge 24 is introduced into the housing 26 by elastic interlocking, in an upward axial movement of the bulge 24 relative to the housing 26.
  • the housing 26 is extended axially downward by a conical annular portion 40 forming ramp coaxial with the vertical axis A, on which the bulge 24 is supported during its insertion movement in the housing 26.
  • this conical annular portion 40 which extends the housing 26 is used when the housing 26 is made integrally with the barrel 20, as shown in Figures 1, 2A, and 2B, but also when the housing 26 is made in the b insert reported 28, as shown in Figures 4A and 4B.
  • Figures 3A to 3C different embodiments of the bulge 24, which can be used in combination with any of the embodiments of the housing 26 described above.
  • the bulge 24 is produced integrally with the shaft 12, by machining or any other known embodiment. This makes it possible to have an arrangement for mounting the shaft 12, the structure of which is relatively simple, in particular when the housing 26 is made integrally with the barrel 20.
  • FIG. 3A the bulge 24 is produced integrally with the shaft 12, by machining or any other known embodiment.
  • the bulge 24 is part of an end piece 42 which extends the lower end 12i of the shaft 12 up to the crank 16.
  • This end piece 42 here has an upper orifice 44 open upwards and which receives a complementary knurled portion 46 from the lower end 12i of the shaft 12, and the endpiece 42 comprises at its lower end 42i a knurled portion 48 which is received in a complementary orifice 50 of an end 16a of the crank 16.
  • These knurled portions 46, 48 and the complementary orifices 44, 50 allow the end piece 42 to transmit the drive torque of the shaft 12 in pivoting about the axis A coming from the crank 16.
  • a third mode has been shown in FIG.
  • 3C embodiment of the bulge 24 which is a part of a cylindrical sleeve 52 which is crossed by the knurled portion 46 extending the shaft 12 downwards.
  • the lower end of the knurled portion 46 is received directly in the complementary orifice 50 of the crank 16, so that the sleeve 52 does not have to transmit the drive force from the shaft 12, it may therefore consist of a part of revolution around the vertical axis A of the shaft 12.
  • this consists of an annular element, or rod , which is attached to the external cylindrical wall 12e of the lower end 12i of the shaft 12.
  • the bulge is received in a complementary annular groove, produced in the external cylindrical wall 12e of the shaft 12.
  • FIG. 3A shows another aspect of the invention making it possible to prevent the bulge 24 from coming out of the housing 26 during manipulation of the plate 10 before it is mounted on the body structure element of the vehicle.
  • the external cylindrical wall 20e of the lower end 20i of the barrel 20 carries an annular ring 54. This annular ring is positioned axially on the barrel 20 at the level of the lower opening of the housing 26, and it is produced in a rigid material.
  • FIG. 3A shows another aspect of the invention according to which sealing means, which here consist of an annular lip seal 56, are arranged at the lower opening of the housing 26.
  • sealing means which here consist of an annular lip seal 56, are arranged at the lower opening of the housing 26.
  • the seal 56 is received in the space between the conical portion 40 and the lower end of the shaft 12, thus preventing any impurity from entering between the bulge 24 and the housing 26.
  • the shaft 12 can then move axially downward relative to the barrel 20, so that it no longer forms an element liable to injure someone.
  • the upper end 12s of the shaft 12 is linked to the wiping arm 14, and therefore, during the displacement of the shaft 12 relative to the barrel 20, the arm being integral with the shaft 12 comes into abutment against the upper end of the barrel 20, preventing any additional movement of the shaft 12.
  • the arm 14 is detachably connected to the upper end 12s of the shaft 12.
  • the arm 14 is then no longer linked to the plate 10, it is therefore entirely detached from the vehicle and no longer constitutes an element liable to injure someone.
  • the arm 14 is connected to the shaft 12 by means of a connecting ring 58 which is fixed to the upper end 12s of the shaft 12 by means of complementary conical surfaces 60 and by a nut tightening 62.
  • the connecting ring 58 is connected to the arm 14 by means of complementary cylindrical surfaces 58a, 14a, which are in contact with one another so as to generate friction forces opposing a movement of the connecting ring 58 relative to the arm 14 before the impact.
  • the connecting ring 58 having to transmit to the arm 14 the driving torque in rotation about the axis A, the cylindrical surfaces 58a and 14a are, according to a preferred embodiment of the invention, of non-circular radial section, for example they have a square section.
  • the radial dimensions of the connecting ring 58 are greater than the diameter of the shaft 12.
  • the upper end 20s of the barrel 20 is extended axially upwards by a cylindrical flange 64.
  • the internal radius of the cylindrical flange 64 is greater than the greatest radial dimension of the connecting ring 58, and the axial length of the cylindrical flange 64 is determined so as to allow a sufficient axial stroke of the connection ring 58, and donation of the shaft 12, for the exit of the bulge 24 from the housing 26.
  • the flange is shaped so that the arm 14 extends near the edge annular upper end 64s of the collar before the impact.
  • the arm 14 abuts against the upper edge 64 of the flange 64, then the shaft 12 continues its axial movement downward relative to the barrel 20, so that the bulge 24 comes out of the housing 26. Also, the connecting ring 58 moves in the flange 64 until it abuts against the upper end 20s of the barrel 20.

Abstract

The invention concerns an arrangement for mounting and pivotally guiding about a generally vertical axis (A) a drive shaft (12) of a wiping mechanism comprising a guide plate (10) including a cylindrical shank (20) wherein said shaft (12) is pivotally guided. The invention is characterized in that the shaft (12) comprises a bulge (24) received inside a housing (26) matching the shank (20) and capable of exiting the housing (26) by elastic deformation of the bulge (24) and/or of the housing, through an axial displacement downward of the shaft (12) relative to the shank (20), when the wiping mechanism is subjected to a violent impact.

Description

"Agencement pour le guidage d'un arbre d'entraînement de mécanisme d'essuyage permettant l'effacement de l'arbre d'entraînement en cas de choc" L'invention propose un agencement pour le guidage en pivotement d'un arbre d'entraînement de mécanisme d'essuie- glace, qui permet l'effacement de l'extrémité supérieure de l'arbre à l'intérieur du compartiment moteur en cas de choc. L'invention propose plus particulièrement un agencement pour le montage et le guidage en pivotement autour d'un axe globalement vertical, par rapport à un élément de structure de caisse d'un véhicule automobile, d'un arbre d'entraînement d'un mécanisme d'essuyage dont une extrémité supérieure est fixée à un bras d'essuyage et dont l'extrémité inférieure est fixée à une manivelle d'une tringlerie de transmission, du type qui comporte une platine de guidage qui est destinée à être fixé à l'élément de structure de caisse et qui comporte un fût cylindrique dans lequel l'arbre est guidé en pivotement. En cas de collision du véhicule avec un piéton, la partie du mécanisme d'essuie-glace qui fait globalement saillie à l'extérieur du véhicule constitue un objet contondant qui risque de provoquer des blessures. On connaît l'existence de moyens permettant un effacement vers le bas de l'extrémité supérieure de l'arbre d'entraînement par rapport à la caisse du véhicule, notamment dans le document WO-A-99.38736 qui décrit des moyens permettant à l'arbre d'entraînement de coulisser axialement dans le fût en cas d'impact. Le document DE-A-195.46.906 décrit aussi de tels moyens permettant l'effacement de l'arbre par l'intermédiaire d'une bague élastique interposée entre l'arbre et son fût de guidage. La bague est fixée au fût et elle comporte plusieurs doigts élastiques qui sont reçus dans une gorge annulaire de l'arbre, et qui sont aptes à sortir de la gorge en cas de choc. Néanmoins un tel agencement nécessite l'utilisation d'une bague supplémentaire dont la structure est relativement complexe, ce qui augmente le coût de sa fabrication. L'invention a pour but de proposer un agencement pour guider un arbre d'entraînement pour lequel les moyens de retenue de l'arbre ont une structure simplifiée. Dans ce but, l'invention propose un agencement du type décrit précédemment, caractérisé en ce que l'arbre comporte un renflement qui est reçu à l'intérieur d'un logement complémentaire du fût, pour réaliser le blocage de l'arbre en mouvement vertical par rapport au fût, et qui est apte à sortir du logement par déformation élastique du renflement et/ou du logement, par un déplacement axial vers le bas de l'arbre par rapport au fût, lorsque le mécanisme d'essuyage est soumis à un impact violent dont la composante verticale (F) est orientée vers le bas, la valeur de la composante étant supérieure à une valeur de seuil déterminée. Selon d'autres caractéristiques de l'invention : - le logement est réalisé venu de matière avec le fût par moulage d'un matériau déformable élastiquement ; - le logement est réalisé dans une bague globalement cylindrique coaxiale à l'arbre, qui est réalisée en un matériau déformable élastiquement, et qui est reçue dans une cavité du fût ; - la cavité comporte un tronçon de dimensions radiales internes supérieures aux dimensions radiales externes de la bague, pour permettre une augmentation du diamètre extérieur de la bague lors de la sortie du renflement hors du logement ; - le tronçon de la cavité est de forme globalement tronconique ; - le renflement est réalisé venu de matière avec l'arbre ; - renflement est un élément rapporté qui est fixé à l'arbre ; - le logement est agencé au niveau de l'extrémité axiale inférieure du fût ; - le renflement et le logement sont de forme globalement sphérique ; - le logement est prolongé vers le bas par une portion annulaire conique coaxiale à l'arbre, dont le diamètre intérieur croît vers le bas en formant rampe ; - l'extrémité supérieure de l'arbre est fixée au bras d'essuyage par l'intermédiaire d'un anneau de liaison qui est apte à se désolidariser de l'arbre ou du bras lors du choc ; - le fût est prolongé axialement vers le haut par une collerette annulaire contre laquelle le bras est apte à venir en butée lors du choc, pour provoquer la désolidarisation de l'anneau d'avec le bras ; - l'agencement comporte un joint annulaire d'étanchéité agencé entre le renflement et le logement, au niveau de l'extrémité inférieure du logement. D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera aux figures annexées parmi lesquelles : - la figure 1 est une représentation schématique en perspective et avec arrachement d'un agencement pour le montage d'un arbre d'entraînement comportant un renflement et un logement complémentaire conformes à l'invention ; - les figures 2A et 2B sont des sections suivant l'axe A de l'agencement représenté à la figure 1 , montrant les positions relatives de l'arbre d'entraînement et du fût, avant et après le choc ; - les figures 3A à 3C sont des détails à plus grande échelle de différents modes de réalisation du renflement ; - les figures 4A et 4B sont ces vues similaires aux figures"Arrangement for guiding a drive shaft of a wiping mechanism allowing the drive shaft to be erased in the event of an impact" The invention provides an arrangement for guiding a pivoting shaft of a wiper mechanism drive, which clears the upper end of the shaft inside the engine compartment in the event of an impact. The invention more particularly provides an arrangement for mounting and pivoting guiding around a generally vertical axis, relative to a body structure element of a motor vehicle, of a drive shaft of a mechanism wiper, an upper end of which is fixed to a wiping arm and the lower end of which is fixed to a crank of a transmission linkage, of the type which comprises a guide plate which is intended to be fixed to the body structure element and which comprises a cylindrical barrel in which the shaft is guided in pivoting. In the event of a vehicle collision with a pedestrian, the part of the wiper mechanism that projects overall from the outside of the vehicle constitutes a blunt object which may cause injury. We know of the existence of means allowing a downward erasure of the upper end of the drive shaft relative to the vehicle body, in particular in document WO-A-99.38736 which describes means allowing the drive shaft to slide axially in the barrel in the event of impact. Document DE-A-195.46.906 also describes such means allowing the erasure of the shaft by means of an elastic ring interposed between the shaft and its guide shaft. The ring is fixed to the barrel and has several elastic fingers which are received in an annular groove in the shaft, and which are capable of coming out of the groove in the event of an impact. However, such an arrangement requires the use of an additional ring whose structure is relatively complex, which increases the cost of its manufacture. The object of the invention is to propose an arrangement for guiding a drive shaft for which the means for retaining the shaft have a simplified structure. To this end, the invention provides an arrangement of the type described above, characterized in that the shaft has a bulge which is received inside a complementary housing of the barrel, to block the moving shaft vertical with respect to the barrel, and which is capable of leaving the housing by elastic deformation of the bulge and / or of the housing, by an axial downward movement of the shaft relative to the barrel, when the wiping mechanism is subjected to a violent impact whose vertical component (F) is oriented downwards, the value of the component being greater than a determined threshold value. According to other characteristics of the invention: - the housing is made integrally with the barrel by molding an elastically deformable material; - The housing is made in a generally cylindrical ring coaxial with the shaft, which is made of an elastically deformable material, and which is received in a cavity of the barrel; - The cavity has a section of internal radial dimensions greater than the external radial dimensions of the ring, to allow an increase in the external diameter of the ring when the bulge comes out of the housing; - The section of the cavity is generally frustoconical in shape; - the bulge is made integrally with the tree; - bulge is an attached element which is fixed to the shaft; - The housing is arranged at the lower axial end of the barrel; - the bulge and the housing are generally spherical in shape; - The housing is extended downwards by a conical annular portion coaxial with the shaft, the internal diameter of which increases downwards, forming a ramp; - The upper end of the shaft is fixed to the wiping arm by means of a connecting ring which is capable of detaching from the shaft or from the arm during the impact; - the barrel is extended axially upwards by an annular collar against which the arm is able to come into abutment during the impact, to cause the separation of the ring from the arm; - The arrangement comprises an annular seal arranged between the bulge and the housing, at the lower end of the housing. Other characteristics and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended figures among which: - Figure 1 is a schematic representation in perspective and with cutaway of a arrangement for mounting a drive shaft comprising a bulge and a complementary housing in accordance with the invention; - Figures 2A and 2B are sections along the axis A of the arrangement shown in Figure 1, showing the relative positions of the drive shaft and the barrel, before and after the impact; - Figures 3A to 3C are details on a larger scale of different embodiments of the bulge; - Figures 4A and 4B are these views similar to the figures
2A et 2B, représentant un autre mode de réalisation du logement. Dans la description qui va suivre, des éléments identiques, similaires ou analogues seront désignés par les mêmes chiffres de référence. On a représenté à la figure 1 une platine 10 pour le guidage d'un arbre 12 d'entraînement 12, en pivotement autour d'un axe A vertical. L'arbre 12 est un élément d'un mécanisme d'essuyage d'un panneau vitré de véhicule automobile (non représenté), et il est destiné à être relié à son extrémité supérieure 12s à un balai d'essuyage 14 (représenté aux figures 4A, 4B) et à son extrémité inférieure 12i à une manivelle 16 d'une tringlerie de transmission de mouvement. La platine 10 comporte une semelle 18 pour sa fixation à un élément de structure de caisse du véhicule, et elle comporte un fût 20 cylindrique 20 coaxial à l'arbre 12 et à l'axe A. Le fût 20 permet de réaliser le guidage en pivotement de l'arbre 12. Pour cela, sa paroi cylindrique interne 20i est complémentaire de la paroi cylindrique externe 12e de l'arbre 12. Enfin, le fût 20 comporte des moyens 22 pour bloquer l'arbre 12 en mouvement axial vers le bas. Ces moyens de blocage 22 de l'arbre 12 permettent en outre à l'arbre 12 de se déplacer axialement vers le bas par rapport au fût 20 lorsque le mécanisme d'essuyage est soumis à un choc violent dont la composante verticale, que l'on a représentée aux figures par la flèche F, est supérieure à une valeur de seuil déterminée. Conformément à l'invention, ces moyens de blocage 22 comportent un renflement 24 qui est solidaire de l'arbre 12, et qui est reçu dans un logement 26 complémentaire 26 du fût 20. Pour permettre à l'arbre 12 de pivoter par rapport au fût2A and 2B, representing another embodiment of the housing. In the description which follows, identical, similar or analogous elements will be designated by the same reference numbers. There is shown in Figure 1 a plate 10 for guiding a drive shaft 12 12, pivoting about a vertical axis A. The shaft 12 is an element of a wiping mechanism of a glazed panel of a motor vehicle (not shown), and it is intended to be connected at its upper end 12s to a wiping brush 14 (shown in the figures 4A, 4B) and at its lower end 12i to a crank 16 of a motion transmission linkage. The plate 10 comprises a sole 18 for its attachment to a body structure element of the vehicle, and it comprises a cylindrical barrel 20 coaxial with the shaft 12 and the axis A. The barrel 20 makes it possible to carry out the guiding in pivoting of the shaft 12. For this, its internal cylindrical wall 20i is complementary to the external cylindrical wall 12e of the shaft 12. Finally, the barrel 20 has means 22 for locking the shaft 12 in axial downward movement . These blocking means 22 of the shaft 12 also allow the shaft 12 to move axially downward relative to the barrel 20 when the wiping mechanism is subjected to a violent shock, the vertical component of which there is shown in the figures by the arrow F, is greater than a determined threshold value. According to the invention, these locking means 22 include a bulge 24 which is integral with the shaft 12, and which is received in a complementary housing 26 26 of the barrel 20. To allow the shaft 12 to pivot relative to the barrel
20, le renflement 24 et le logement 26 présentent tous les deux une symétrie de révolution autour de l'axe vertical A, et selon un mode de réalisation préféré, le renflement 24 et le logement 26 sont de forme sphérique. Le renflement 24 est porté par l'arbre 12 et est agencé entre l'extrémité inférieure 12i et l'extrémité supérieure 12s de l'arbre 12. Cela signifie que le logement 26 est traversé par l'arbre 12 et donc qu'il est ouvert à ses extrémités supérieures et inférieures. Selon un mode de réalisation préféré du logement 26, l'ouverture supérieure du logement 26 est complémentaire de l'arbre 12, c'est-à-dire que son diamètre est égal au diamètre de l'arbre 12, et l'ouverture inférieure du logement 26 est conçue de manière à réaliser le blocage axial de l'arbre 12 lorsque le mécanisme d'essuyage est en conditions normales d'utilisation, et de manière à permettre la sortie du renflement 24 lors du choc. A cet effet, comme on peut le voir à la figure 2A, le diamètre de l'ouverture inférieure est inférieur au plus grand diamètre du renflement 24, de manière à réaliser le blocage axial du renflement. Aussi, le diamètre de l'ouverture inférieure est supérieur au diamètre de l'arbre 12. Pour permettre le mouvement axial vers le bas de l'arbre 12 par rapport au fût 20, et selon un autre aspect de l'invention, le renflement 24 ou le logement 26 est apte à se déformer élastiquement lors du choc. A cet effet, le renflement 24 ou le logement 26, respectivement, est réalisé en un matériau déformable élastiquement dont les caractéristiques d'élasticité sont déterminées de manière qu'il se déforme lors du choc, et le diamètre de l'ouverture inférieure du logement 26 est déterminé, en fonction du type du matériau élastique, et en fonction de la valeur de seuil de la composante verticale du choc. Selon un mode de réalisation préféré de l'invention, c'est le logement 26 qui se déforme lors du choc. On a représenté aux figures 1 , 2A et 2B un premier mode de réalisation de l'invention selon lequel le logement 26 est réalisé venu de matière avec le fût 20. Le fût 20 est ainsi réalisé en un matériau élastique apte à être moulé, notamment en matière plastique. Selon un autre aspect de l'invention, le logement 26 est réalisé à proximité de l'extrémité inférieure 20i du fût 20. Ainsi, la sortie du renflement 24 hors du logement 26 correspond à une désolidarisation complète du renflement 24 par rapport au fût 20. De ce fait, le renflement 24 ne peut plus s'opposer au mouvement axial de l'arbre 12 après le choc. On a représenté aux figures 2A et 2B les positions relatives de l'arbre 12 et du renflement 24 par rapport au fût 20 et au logement 26 respectivement avant et après le choc. Comme on peut le voir à la figure 2A, lorsque le renflement20, the bulge 24 and the housing 26 both have a symmetry of revolution about the vertical axis A, and according to a preferred embodiment, the bulge 24 and the housing 26 are spherical in shape. The bulge 24 is carried by the shaft 12 and is arranged between the lower end 12i and the upper end 12s of the shaft 12. This means that the housing 26 is crossed by the shaft 12 and therefore that it is open at its upper and lower ends. According to a preferred embodiment of the housing 26, the upper opening of the housing 26 is complementary to the shaft 12, that is to say that its diameter is equal to the diameter of the shaft 12, and the lower opening of the housing 26 is designed so as to achieve the axial locking of the shaft 12 when the wiping mechanism is in normal conditions of use, and so as to allow the bulge 24 to exit during the impact. To this end, as can be seen in FIG. 2A, the diameter of the lower opening is less than the largest diameter of the bulge 24, so as to achieve the axial locking of the bulge. Also, the diameter of the lower opening is greater than the diameter of the shaft 12. To allow the downward axial movement of the shaft 12 relative to the barrel 20, and according to another aspect of the invention, the bulge 24 or the housing 26 is able to deform elastically upon impact. To this end, the bulge 24 or the housing 26, respectively, is made of an elastically deformable material whose elasticity characteristics are determined so that it deforms upon impact, and the diameter of the lower opening of the housing 26 is determined, as a function of the type of elastic material, and as a function of the threshold value of the vertical component of the shock. According to a preferred embodiment of the invention, it is the housing 26 which deforms upon impact. There is shown in Figures 1, 2A and 2B a first embodiment of the invention according to which the housing 26 is made integrally with the barrel 20. The barrel 20 is thus made of an elastic material capable of being molded, in particular made of plastic. According to another aspect of the invention, the housing 26 is produced near the lower end 20i of the barrel 20. Thus, the exit of the bulge 24 from the housing 26 corresponds to complete separation of the bulge 24 from the barrel 20 Therefore, the bulge 24 can no longer oppose the axial movement of the shaft 12 after the impact. FIGS. 2A and 2B show the relative positions of the shaft 12 and the bulge 24 relative to the barrel 20 and to the housing 26 respectively before and after the impact. As can be seen in Figure 2A, when the bulge
24 est présent à l'intérieur du logement 26, c'est-à-dire avant le choc, la portion inférieure du logement 26 permet de retenir axialement le renflement, empêchant ainsi l'arbre 12 de se déplacer axialement vers le bas par rapport au fût 20. Lorsque le mécanisme d'essuyage est soumis à un impact violent, il en résulte un effort d'appui du renflement 24 contre le logement 26 dont l'amplitude permet de provoquer la déformation élastique du logement 26, et plus spécialement de la partie inférieure du logement 26. En effet, les formes sphériques complémentaires du renflement 24 et de la partie inférieure du logement 26 sont en forme de rampes en vis-à-vis, de manière qu'un effort d'appui orienté axialement vers le bas du renflement 24 sur le logement 26 génère en tout point de la partie inférieure du logement 26 un effort radial orienté vers l'extérieur. Ainsi, le logement 26 s'élargit de manière que le diamètre de son ouverture inférieure devient égal au plus grand diamètre du renflement 24, pour permettre au renflement 24 de traverser cette ouverture et se désolidariser du fût 20. Après que le renflement 24 est sorti du logement 26, comme on l'a représenté à la figure 2B, le logement 26 et le fût 20 reviennent élastiquement dans leur forme initiale, pour laquelle le diamètre de l'ouverture inférieure est inférieur au plus grand diamètre du renflement 24. L'utilisation d'un matériau élastique est avantageuse pour la réalisation du logement 26. Cependant, puisque le logement 26 est réalisé venu de matière avec le fût 20, cela signifie que la platine 10 est aussi réalisée dans ce même matériau élastique. Or, la platine 10 est soumise à de nombreuses sollicitations mécaniques variables. Ainsi, le fait que la platine 10 est réalisée en un matériau élastique, implique que la platine 10 peut se déformer de manière aléatoire, et implique donc un mauvais balayage du bras par rapport à la zone à essuyer. C'est pourquoi, selon un autre mode de réalisation de l'invention représenté aux figures 4A et 4B, le fût 20 est réalisé en un matériau rigide, par exemple en aluminium, et le logement24 is present inside the housing 26, that is to say before the impact, the lower portion of the housing 26 makes it possible to retain the bulge axially, thus preventing the shaft 12 from moving axially downward with respect to in the barrel 20. When the wiping mechanism is subjected to a violent impact, this results in an effort to support the bulge 24 against the housing 26 whose amplitude makes it possible to cause the elastic deformation of the housing 26, and more particularly of the lower part of the housing 26. In fact, the complementary spherical shapes of the bulge 24 and of the lower part of the housing 26 are in the form of ramps facing each other, so that a bearing force oriented axially towards the bottom of the bulge 24 on the housing 26 generates at any point of the lower part of the housing 26 a radial force oriented towards the outside. Thus, the housing 26 widens so that the diameter of its lower opening becomes equal to the largest diameter of the bulge 24, to allow the bulge 24 to pass through this opening and to separate from the barrel 20. After the bulge 24 is out of the housing 26, as shown in FIG. 2B, the housing 26 and the barrel 20 return elastically to their initial shape, for which the diameter of the lower opening is less than the largest diameter of the bulge 24. The use of an elastic material is advantageous for the production of the housing 26. However, since the housing 26 is made integrally with the barrel 20, this means that the plate 10 is also produced in this same elastic material. However, the plate 10 is subjected to numerous variable mechanical stresses. Thus, the fact that the plate 10 is made of an elastic material, implies that the plate 10 can deform in a random manner, and therefore implies a bad sweeping of the arm relative to the area to be wiped. This is why, according to another embodiment of the invention shown in Figures 4A and 4B, the barrel 20 is made of a rigid material, for example aluminum, and the housing
26 est réalisé dans une pièce rapportée 28 au fût 20 qui est réalisée en un matériau déformable élastiquement. Cette pièce rapportée consiste ici en une bague 28 globalement cylindrique et coaxiale à l'axe A de l'arbre 12. Elle est fixée à l'extrémité inférieure 20i du fût 20 par tout moyen connu, notamment par encastrement. La bague 28 comporte un corps 32 cylindrique de révolution dans lequel le logement 26 est réalisé, et une collerette radiale 34 qui prolonge l'extrémité inférieure 32i corps 32 radialement vers l'extérieur. Pour recevoir la bague 28, l'extrémité inférieure 20i du fût 20 comporte une cavité 30 coaxiale à l'axe A de l'arbre 12 et qui est ouverte vers le bas. La cavité 30 comporte un tronçon supérieur 36 et un tronçon inférieur 38 qui reçoivent respectivement le corps 32 et la collerette 34 de la bague 28. La collerette 34 est reçue dans le tronçon inférieur 38 de manière à réaliser le positionnement axial et la fixation de la bague 28 dans la cavité 30. Pour cela, et à titre d'exemple non limitatif, la collerette 34 est encastrée à l'intérieur du tronçon inférieur 38. Lors de la sortie du renflement 24 hors du logement 26 en cas de choc, le logement 26 se déforme, c'est-à-dire que le corps 32 de la bague 28 se déforme. Cette déformation du corps 32 consiste principalement en une augmentation de son diamètre extérieur. Ainsi, pour permettre la déformation du corps 32, certaines dimensions du tronçon supérieur 36, notamment son diamètre intérieur, sont supérieures à celles du corps 32. Selon un mode de réalisation préféré de la cavité 30 représenté aux figures, le tronçon supérieur 36 est de forme tronconique, dont le diamètre à son extrémité inférieure est supérieur au diamètre à son extrémité supérieure. De plus, le diamètre du tronçon supérieur, au niveau de son extrémité supérieure est globalement égal au diamètre extérieur du corps 32 de la bague 28, pour éviter tout mouvement radial de la bague 28 dans la cavité 30. Le renflement 24 est introduit dans le logement 26 par emboîtement élastique, selon un mouvement axial ascendant du renflement 24 par rapport au logement 26. Pour favoriser la déformation élastique de l'ouverture inférieure du logement 26, le logement 26 est prolongé axialement vers le bas par une portion annulaire conique 40 formant rampe coaxiale à l'axe vertical A, sur laquelle le renflement 24 s'appuie lors de sont mouvement d'introduction dans le logement 26. Comme on peut le voir aux figures, cette portion annulaire conique 40 qui prolonge le logement 26 est utilisée lorsque le logement 26 est réalisé venu de matière avec le fût 20, comme on l'a représenté aux figures 1 , 2A, et 2B, mais aussi lorsque le logement 26 est réalisé dans la bague rapportée 28, comme représenté aux figures 4A et 4B. On a représenté aux figures 3A à 3C différents modes de réalisation du renflement 24, qui peut être utilisé en combinaison avec l'un quelconque des modes de réalisation du logement 26 décrits précédemment. Selon un premier mode de réalisation représenté à la figure 3A, le renflement 24 est réalisé venu de matière avec l'arbre 12, par usinage ou tout autre mode de réalisation connu. Ceci permet d'avoir un agencement pour le montage de l'arbre 12 dont la structure est relativement simple, notamment lorsque le logement 26 est réalisé venu de matière avec le fût 20. Selon un autre mode de réalisation représenté à la figure 3B, le renflement 24 est une partie d'un embout 42 qui prolonge l'extrémité inférieure 12i de l'arbre 12 jusqu'à la manivelle 16. Cet embout 42 comporte ici un orifice supérieur 44 ouvert vers le haut et qui reçoit une portion moletée 46 complémentaire de l'extrémité inférieure 12i de l'arbre 12, et l'embout 42 comporte à son extrémité inférieure 42i une portion moletée 48 qui est reçue dans un orifice complémentaire 50 d'une extrémité 16a de la manivelle 16. Ces portions moletées 46, 48 et les orifices complémentaires 44, 50 permettent à l'embout 42 de transmettre le couple d'entraînement de l'arbre 12 en pivotement autour de l'axe A provenant de la manivelle 16. On a représenté à la figure 3C un troisième mode de réalisation du renflement 24 qui est une partie d'un manchon 52 cylindrique qui est traversé par la portion moletée 46 prolongeant l'arbre 12 vers le bas. Ici, l'extrémité inférieure de la portion moletée 46 est reçue directement dans l'orifice complémentaire 50 de la manivelle 16, de manière que le manchon 52 n'a pas à transmettre l'effort d'entraînement de l'arbre 12, il peut par conséquent consister en une pièce de révolution autour de l'axe vertical A de l'arbre 12. Enfin, selon encore un autre mode de réalisation (non représenté) du renflement 24, celui-ci consiste en un élément annulaire, ou jonc, qui est rapporté sur la paroi cylindrique externe 12e de l'extrémité inférieure 12i de l'arbre 12. Pour cela, le renflement est reçu dans une gorge annulaire complémentaire, réalisée dans la paroi cylindrique externe 12e de l'arbre 12. Selon un mode de réalisation préféré de ce jonc, sa section est circulaire, pour que la portion du jonc qui fait saillie par rapport à la paroi cylindrique externe 12e de l'arbre 12 ait une forme globalement bombée. De plus, le jonc est réalisé en un matériau relativement rigide, par exemple en alliage de fer, pour que ce soit le logement 26 qui se déforme effectivement lors du choc. On a représenté à la figure 3A un autre aspect de l'invention permettant d'empêcher la sortie du renflement 24 hors du logement 26 lors d'une manipulation de la platine 10 avant son montage sur l'élément de structure de caisse du véhicule. Selon cet aspect, la paroi cylindrique externe 20e de l'extrémité inférieure 20i du fût 20 porte une bague annulaire 54. Cette bague annulaire est positionnée axialement sur le fût 20 au niveau de l'ouverture inférieure du logement 26, et elle est réalisée en un matériau rigide. Ainsi, elle empêche que l'extrémité inférieure du fût 20 ne se déforme radialement pour laisser passer le renflement. Le positionnement de la bague annulaire 54 sur le fût 20 est réalisé par l'intermédiaire d'une nervure annulaire 66 qui s'étend radialement vers l'extérieur depuis la paroi cylindrique extérieure 20e du fût 20 et qui est reçue dans une gorge annulaire complémentaire 68 de la bague 54. On a représenté à la figure 3A un autre aspect de l'invention selon lequel des moyens d'étanchéité, qui consistent ici en un joint annulaire à lèvre 56, sont agencés au niveau de l'ouverture inférieure du logement 26. Ici, le joint 56 est reçu dans l'espace compris entre la portion conique 40 et l'extrémité inférieure de l'arbre 12, empêchant ainsi que toute impureté ne s'introduise entre le renflement 24 et le logement 26. Lorsque le renflement 24 est sorti du logement 26, l'arbre 12 peut alors se déplacer axialement vers le bas par rapport au fût 20, de manière qu'il ne forme plus un élément risquant de blesser quelqu'un. Cependant, l'extrémité supérieure 12s de l'arbre 12 est liée au bras d'essuyage 14, et donc, lors du déplacement de l'arbre 12 par rapport au fût 20, le bras étant solidaire de l'arbre 12 vient en butée contre l'extrémité supérieure du fût 20, empêchant tout mouvement supplémentaire de l'arbre 12. Comme on peut le voir aux figures 4A et 4B, et selon une variante de réalisation de l'agencement pour le montage de l'arbre 12, le bras 14 est relié à l'extrémité supérieure 12s de l'arbre 12 de manière démontable. Ainsi, lorsque le bras 14 vient en butée contre l'extrémité supérieure du fût 20, il se désolidarise du bras 14 qui peut ensuite poursuivre son déplacement. Le bras 14 n'est alors plus lié à la platine 10, il est donc entièrement désolidarisé du véhicule et ne constitue plus un élément risquant de blesser quelqu'un. Ici, le bras 14 est relié à l'arbre 12 par l'intermédiaire d'un anneau de liaison 58 qui est fixé à l'extrémité supérieure 12s de l'arbre 12 par l'intermédiaire de surfaces coniques complémentaires 60 et par un écrou de serrage 62. L'anneau de liaison 58 est relié au bras 14 par l'intermédiaire de surfaces cylindriques complémentaires 58a, 14a, qui sont en contact entre elles de manière à générer des efforts de frottement s'opposant à un mouvement de l'anneau de liaison 58 par rapport au bras 14 avant le choc. L'anneau de liaison 58 devant transmettre au bras 14 le couple d'entraînement en rotation autour de l'axe A, les surfaces cylindriques 58a et 14a sont, selon un mode de réalisation préféré de l'invention, de section radiale non circulaire, par exemple elles ont une section carrée. Les dimensions radiales de l'anneau de liaison 58 sont supérieures au diamètre de l'arbre 12. Ainsi, après sa désolidarisation du bras 14, l'anneau de liaison 58 vient en butée axiale contre l'extrémité supérieure 20s du fût 20, empêchant ainsi tout déplacement de l'arbre 12 10 au-delà de cette position axiale. Pour permettre à l'arbre 12 d'avoir une amplitude de déplacement axial suffisante pour que le renflement 24 puisse sortir du logement 26 et pour que son extrémité supérieure 12s puisse être suffisamment dissimulée après le choc, l'extrémité supérieure 20s du fût 20 est prolongée axialement vers le haut par une collerette cylindrique 64. Le rayon intérieur de la collerette cylindrique 64 est supérieur à la plus grande dimension radiale de l'anneau de liaison 58, et la longueur axiale de la collerette cylindrique 64 est déterminée de manière à permettre une course axiale suffisante de l'anneau de raccordement 58, et don de l'arbre 12, pour la sortie du renflement 24 hors du logement 26. Enfin, la collerette est conformée de manière que le bras 14 s'étend à proximité du bord annulaire d'extrémité supérieure 64s de la collerette avant le choc. Ainsi, lors du choc sur l'arbre 12, le bras 14 vient en butée contre le bord supérieur 64 de la collerette 64, puis, l'arbre 12 poursuit son déplacement axial vers le bas par rapport au fût 20, de manière que le renflement 24 sorte du logement 26. Aussi, l'anneau de raccordement 58 se déplace dans la collerette 64 jusqu'à venir en butée contre l'extrémité supérieure 20s du fût 20. 26 is made in an insert 28 in the barrel 20 which is made of an elastically deformable material. This insert here consists of a ring 28 generally cylindrical and coaxial with the axis A of the shaft 12. It is fixed to the lower end 20i of the barrel 20 by any known means, in particular by embedding. The ring 28 comprises a cylindrical body 32 of revolution in which the housing 26 is produced, and a radial flange 34 which extends the lower end 32i body 32 radially outwards. To receive the ring 28, the lower end 20i of the barrel 20 has a cavity 30 coaxial with the axis A of the shaft 12 and which is open downwards. The cavity 30 comprises an upper section 36 and a lower section 38 which respectively receive the body 32 and the flange 34 of the ring 28. The flange 34 is received in the lower section 38 so as to achieve the axial positioning and the fixing of the ring 28 in the cavity 30. For this, and by way of nonlimiting example, the flange 34 is embedded inside the lower section 38. When the bulge 24 leaves the housing 26 in the event of an impact, the housing 26 deforms, that is to say that the body 32 of the ring 28 deforms. This deformation of the body 32 consists mainly of an increase in its outside diameter. Thus, to allow the deformation of the body 32, certain dimensions of the upper section 36, in particular its internal diameter, are greater than those of the body 32. According to a preferred embodiment of the cavity 30 shown in the figures, the upper section 36 is of frustoconical shape, whose diameter at its lower end is greater than the diameter at its upper end. In addition, the diameter of the upper section, at its upper end is generally equal to the outside diameter of the body 32 of the ring 28, to avoid any radial movement of the ring 28 in the cavity 30. The bulge 24 is introduced into the housing 26 by elastic interlocking, in an upward axial movement of the bulge 24 relative to the housing 26. To promote the elastic deformation of the lower opening of the housing 26, the housing 26 is extended axially downward by a conical annular portion 40 forming ramp coaxial with the vertical axis A, on which the bulge 24 is supported during its insertion movement in the housing 26. As can be seen in the figures, this conical annular portion 40 which extends the housing 26 is used when the housing 26 is made integrally with the barrel 20, as shown in Figures 1, 2A, and 2B, but also when the housing 26 is made in the b insert reported 28, as shown in Figures 4A and 4B. There are shown in Figures 3A to 3C different embodiments of the bulge 24, which can be used in combination with any of the embodiments of the housing 26 described above. According to a first embodiment shown in FIG. 3A, the bulge 24 is produced integrally with the shaft 12, by machining or any other known embodiment. This makes it possible to have an arrangement for mounting the shaft 12, the structure of which is relatively simple, in particular when the housing 26 is made integrally with the barrel 20. According to another embodiment shown in FIG. 3B, the bulge 24 is part of an end piece 42 which extends the lower end 12i of the shaft 12 up to the crank 16. This end piece 42 here has an upper orifice 44 open upwards and which receives a complementary knurled portion 46 from the lower end 12i of the shaft 12, and the endpiece 42 comprises at its lower end 42i a knurled portion 48 which is received in a complementary orifice 50 of an end 16a of the crank 16. These knurled portions 46, 48 and the complementary orifices 44, 50 allow the end piece 42 to transmit the drive torque of the shaft 12 in pivoting about the axis A coming from the crank 16. A third mode has been shown in FIG. 3C embodiment of the bulge 24 which is a part of a cylindrical sleeve 52 which is crossed by the knurled portion 46 extending the shaft 12 downwards. Here, the lower end of the knurled portion 46 is received directly in the complementary orifice 50 of the crank 16, so that the sleeve 52 does not have to transmit the drive force from the shaft 12, it may therefore consist of a part of revolution around the vertical axis A of the shaft 12. Finally, according to yet another embodiment (not shown) of the bulge 24, this consists of an annular element, or rod , which is attached to the external cylindrical wall 12e of the lower end 12i of the shaft 12. For this, the bulge is received in a complementary annular groove, produced in the external cylindrical wall 12e of the shaft 12. According to a preferred embodiment of this rod, its section is circular, so that the portion of the rod which projects relative to the external cylindrical wall 12e of the shaft 12 has a generally convex shape. In addition, the rod is made of a relatively rigid material, for example of an iron alloy, so that it is the housing 26 which effectively deforms upon impact. FIG. 3A shows another aspect of the invention making it possible to prevent the bulge 24 from coming out of the housing 26 during manipulation of the plate 10 before it is mounted on the body structure element of the vehicle. According to this aspect, the external cylindrical wall 20e of the lower end 20i of the barrel 20 carries an annular ring 54. This annular ring is positioned axially on the barrel 20 at the level of the lower opening of the housing 26, and it is produced in a rigid material. Thus, it prevents the lower end of the barrel 20 from deforming radially to allow the bulge to pass. The positioning of the annular ring 54 on the barrel 20 is achieved by means of an annular rib 66 which extends radially outwards from the external cylindrical wall 20e of the barrel 20 and which is received in a complementary annular groove 68 of the ring 54. FIG. 3A shows another aspect of the invention according to which sealing means, which here consist of an annular lip seal 56, are arranged at the lower opening of the housing 26. Here, the seal 56 is received in the space between the conical portion 40 and the lower end of the shaft 12, thus preventing any impurity from entering between the bulge 24 and the housing 26. When the bulge 24 has come out of the housing 26, the shaft 12 can then move axially downward relative to the barrel 20, so that it no longer forms an element liable to injure someone. However, the upper end 12s of the shaft 12 is linked to the wiping arm 14, and therefore, during the displacement of the shaft 12 relative to the barrel 20, the arm being integral with the shaft 12 comes into abutment against the upper end of the barrel 20, preventing any additional movement of the shaft 12. As can be seen in FIGS. 4A and 4B, and according to an alternative embodiment of the arrangement for mounting the shaft 12, the arm 14 is detachably connected to the upper end 12s of the shaft 12. Thus, when the arm 14 abuts against the upper end of the barrel 20, it separates from the arm 14 which can then continue its movement. The arm 14 is then no longer linked to the plate 10, it is therefore entirely detached from the vehicle and no longer constitutes an element liable to injure someone. Here, the arm 14 is connected to the shaft 12 by means of a connecting ring 58 which is fixed to the upper end 12s of the shaft 12 by means of complementary conical surfaces 60 and by a nut tightening 62. The connecting ring 58 is connected to the arm 14 by means of complementary cylindrical surfaces 58a, 14a, which are in contact with one another so as to generate friction forces opposing a movement of the connecting ring 58 relative to the arm 14 before the impact. The connecting ring 58 having to transmit to the arm 14 the driving torque in rotation about the axis A, the cylindrical surfaces 58a and 14a are, according to a preferred embodiment of the invention, of non-circular radial section, for example they have a square section. The radial dimensions of the connecting ring 58 are greater than the diameter of the shaft 12. Thus, after its separation of the arm 14, the connecting ring 58 comes into axial abutment against the upper end 20s of the barrel 20, thus preventing any movement of the shaft 12 10 beyond this axial position. To allow the shaft 12 to have a sufficient axial displacement amplitude so that the bulge 24 can come out of the housing 26 and so that its upper end 12s can be sufficiently concealed after the impact, the upper end 20s of the barrel 20 is extended axially upwards by a cylindrical flange 64. The internal radius of the cylindrical flange 64 is greater than the greatest radial dimension of the connecting ring 58, and the axial length of the cylindrical flange 64 is determined so as to allow a sufficient axial stroke of the connection ring 58, and donation of the shaft 12, for the exit of the bulge 24 from the housing 26. Finally, the flange is shaped so that the arm 14 extends near the edge annular upper end 64s of the collar before the impact. Thus, during the impact on the shaft 12, the arm 14 abuts against the upper edge 64 of the flange 64, then the shaft 12 continues its axial movement downward relative to the barrel 20, so that the bulge 24 comes out of the housing 26. Also, the connecting ring 58 moves in the flange 64 until it abuts against the upper end 20s of the barrel 20.

Claims

REVENDICATIONS 1 . Agencement pour le montage et le guidage en pivotement autour d'un axe (A) globalement vertical, par rapport à un élément de structure de caisse d'un véhicule automobile, d'un arbre (12) d'entraînement d'un mécanisme d'essuyage dont une extrémité supérieure (12s) est fixée à un bras (14) d'essuyage et dont l'extrémité inférieure (12i) est fixée à une manivelle (16) d'une tringlerie de transmission, du type qui comporte une platine (10) de guidage qui est destinée à être fixée à l'élément de structure de caisse et qui comporte un fût (20) cylindrique dans lequel l'arbre (12) est guidé en pivotement, caractérisé en ce que l'arbre (12) comporte un renflement (24) qui est reçu à l'intérieur d'un logement (26) complémentaire du fût (20), pour réaliser le blocage de l'arbre (12) en mouvement vertical par rapport au fût (20), et qui est apte à sortir du logement (26) par déformation élastique du renflement (24) et/ou du logement (26), par un déplacement axial vers le bas de l'arbre (12) par rapport au fût (20), lorsque le mécanisme d'essuyage est soumis à un impact dont la composante verticale (F) est orientée vers le bas, la valeur de la composante étant supérieure à une valeur de seuil déterminée. CLAIMS 1. Arrangement for mounting and pivoting guiding around a generally vertical axis (A), relative to a body structure element of a motor vehicle, of a shaft (12) driving a mechanism of wiping whose upper end (12s) is fixed to a wiping arm (14) and whose lower end (12i) is fixed to a crank (16) of a transmission linkage, of the type which includes a plate (10) guide which is intended to be fixed to the body structure element and which comprises a cylindrical barrel (20) in which the shaft (12) is pivotally guided, characterized in that the shaft (12 ) has a bulge (24) which is received inside a housing (26) complementary to the barrel (20), for locking the shaft (12) in vertical movement relative to the barrel (20), and which is able to come out of the housing (26) by elastic deformation of the bulge (24) and / or of the housing (26), by a displacement a xial down the shaft (12) relative to the barrel (20), when the wiping mechanism is subjected to an impact whose vertical component (F) is oriented downward, the value of the component being greater at a determined threshold value.
2. Agencement selon la revendication précédente, caractérisé en ce que le logement (26) est réalisé venu de matière avec le fût (20) par moulage d'un matériau déformable élastiquement. 2. Arrangement according to the preceding claim, characterized in that the housing (26) is made integrally with the barrel (20) by molding an elastically deformable material.
3. Agencement selon la revendication 1 , caractérisé en ce que le logement (26) est réalisé dans une bague (28) globalement cylindrique coaxiale à l'arbre (12), qui est réalisée en un matériau déformable élastiquement, et qui est reçue dans une cavité (30) du fût (20). 3. Arrangement according to claim 1, characterized in that the housing (26) is made in a ring (28) generally cylindrical coaxial with the shaft (12), which is made of an elastically deformable material, and which is received in a cavity (30) of the barrel (20).
4. Agencement selon la revendication précédente, caractérisé en ce que la cavité (30) comporte un tronçon supérieur (36) qui reçoit un corps (32) de la bague (30) et qui est de dimensions radiales internes supérieures aux dimensions radiales externes du corps (32) de la bague(28), pour permettre une augmentation du diamètre extérieur du corps (32) de la bague (28) lors de la sortie du renflement (24) hors du logement (26). 4. Arrangement according to the preceding claim, characterized in that the cavity (30) comprises an upper section (36) which receives a body (32) of the ring (30) and which is of internal radial dimensions greater than the dimensions external radials of the body (32) of the ring (28), to allow an increase in the external diameter of the body (32) of the ring (28) when the bulge (24) leaves the housing (26).
5. Agencement selon la revendication précédente, caractérisé en ce que le tronçon supérieur (36) de la cavité (30) est de forme globalement tronconique. 5. Arrangement according to the preceding claim, characterized in that the upper section (36) of the cavity (30) is of generally frustoconical shape.
6. Agencement selon l'une quelconque des revendications précédentes, caractérisé en ce que le renflement (24) est réalisé venu de matière avec l'arbre (12). 6. Arrangement according to any one of the preceding claims, characterized in that the bulge (24) is made integrally with the shaft (12).
7. Agencement selon l'une quelconque des revendications7. Arrangement according to any one of the claims
1 à 5, caractérisé en ce que le renflement (24) est une partie d'un élément rapporté (42) qui est monté sur l'arbre (12). 1 to 5, characterized in that the bulge (24) is a part of an insert (42) which is mounted on the shaft (12).
8. Agencement selon l'une quelconque des revendications précédentes, caractérisé en ce que le logement (26) est agencé au niveau de l'extrémité axiale inférieure (20i) du fût (20). 8. Arrangement according to any one of the preceding claims, characterized in that the housing (26) is arranged at the lower axial end (20i) of the barrel (20).
9. Agencement selon l'une quelconque des revendications précédentes, caractérisé en ce que le renflement (24) et le logement (26) sont de forme globalement sphérique. 9. Arrangement according to any one of the preceding claims, characterized in that the bulge (24) and the housing (26) are of generally spherical shape.
10. Agencement selon l'une quelconque des revendications précédentes, caractérisé en ce que le logement (26) est prolongé vers le bas par une portion annulaire (40) conique coaxiale à l'arbre (12), dont le diamètre intérieur croît vers le bas en formant rampe. 10. Arrangement according to any one of the preceding claims, characterized in that the housing (26) is extended downwards by an annular portion (40) conical coaxial with the shaft (12), the internal diameter of which increases towards the low forming a ramp.
1 1 . Agencement selon l'une quelconque des revendications précédentes, caractérisé en ce que l'extrémité supérieure (12s) de l'arbre (12) est reliée au bras (14) d'essuyage par l'intermédiaire d'un anneau de liaison (58) qui est apte à se désolidariser de l'arbre (12) ou du bras (14) lors du choc. 1 1. Arrangement according to any one of the preceding claims, characterized in that the upper end (12s) of the shaft (12) is connected to the wiping arm (14) by means of a connecting ring (58 ) which is capable of detaching from the shaft (12) or from the arm (14) during the impact.
12. Agencement selon la revendication précédente, caractérisé en ce que le fût (20) est prolongé axialement vers le haut par une collerette cylindrique (64) contre laquelle le bras (14) est apte à venir en butée lors du choc, pour provoquer la désolidarisation de l'anneau de liaison (58) d'avec le bras (14). 12. Arrangement according to the preceding claim, characterized in that the barrel (20) is extended axially upwards by a cylindrical collar (64) against which the arm (14) is able to come into abutment during impact, to cause the detachment of the connecting ring (58) from the arm (14).
13. Agencement selon l'une quelconque des revendications précédentes, caractérisé en ce que il comporte un joint annulaire (56) d'étanchéité agencé entre le renflement (24) et le logement (26), au niveau de la portion annulaire (40) conique. 13. Arrangement according to any one of the preceding claims, characterized in that it comprises an annular seal (56) sealing arranged between the bulge (24) and the housing (26), at the annular portion (40) conical.
EP04804082A 2003-12-23 2004-12-20 Arrangement for a wiping mechanism guiding a drive shaft enabling the drive shaft to be retracted in case of impact Withdrawn EP1697183A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0315431A FR2863991B1 (en) 2003-12-23 2003-12-23 ARRANGEMENT FOR GUIDING A DRIVING MECHANISM DRIVE SHAFT FOR CLEARING THE DRIVE SHAFT IN THE EVENT OF A SHOCK
PCT/EP2004/014482 WO2005070734A1 (en) 2003-12-23 2004-12-20 Arrangement for a wiping mechanism guiding a drive shaft enabling the drive shaft to be retracted in case of impact

Publications (1)

Publication Number Publication Date
EP1697183A1 true EP1697183A1 (en) 2006-09-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04804082A Withdrawn EP1697183A1 (en) 2003-12-23 2004-12-20 Arrangement for a wiping mechanism guiding a drive shaft enabling the drive shaft to be retracted in case of impact

Country Status (6)

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EP (1) EP1697183A1 (en)
JP (1) JP2007515346A (en)
KR (1) KR20060129297A (en)
CN (1) CN100522705C (en)
FR (1) FR2863991B1 (en)
WO (1) WO2005070734A1 (en)

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DE102011112725A1 (en) * 2011-09-07 2013-03-07 Steel Automotive GmbH Component, in particular for the wiper mechanism of a motor vehicle or commercial vehicle, and associated manufacturing method
DE102012211072A1 (en) * 2012-06-27 2014-01-02 Robert Bosch Gmbh Windscreen wiper device for cleaning e.g. windscreen of car, has decoupling system comprising attaching part for receiving fixing pin, which is held in axial direction by snap connection in attaching part
FR3016584B1 (en) * 2014-01-21 2017-08-11 Peugeot Citroen Automobiles Sa WIPER FIXING DEVICE
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Also Published As

Publication number Publication date
KR20060129297A (en) 2006-12-15
FR2863991B1 (en) 2007-02-23
JP2007515346A (en) 2007-06-14
FR2863991A1 (en) 2005-06-24
WO2005070734A1 (en) 2005-08-04
CN100522705C (en) 2009-08-05
CN1906067A (en) 2007-01-31

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