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
  • B60S1/3402—Wiper arms; Mountings therefor with means for obtaining particular wiping patterns
  • B60S1/3406—Wiper arms; Mountings therefor with means for obtaining particular wiping patterns the wiper blades being rotated with respect to the wiper arms around an axis perpendicular to the wiped field

Definitions

• the present invention relates to a pantograph wiper, especially for a motor vehicle comprising a windshield said "panoramic".
• a windshield is said to be panoramic when it includes portions of lateral ends that return to the sides of the vehicle, and therefore has on each side an area of very strong curvature.
• pantograph type wiper to optimize the path of the wiper blade relative to the windshield so that a larger surface of the windshield is scanned.
• the principle of such a pantograph-type wiper is to print on the wiper blade a non-circular path on at least some portions of the windshield (in particular the lateral end portions), unlike a wiper. classic ice for which the trajectory of the broom is circular over the entire surface of the windshield.
• the pantograph type wiper comprises, as shown schematically in Figure 1, an arm 1 carrying the brush 2 and formed of two rods substantially parallel to each other in the rest position, to know :
• a first rod 10 hereinafter referred to as the main rod, of which a rear end 11 is stationary in position, this main rod 10 being able to rotate, thanks to a drive shaft in rotation of an engine electric motor (not shown) allowing an alternating sweeping movement about a main pivot axis passing through this rear end 11;
• a second rod 12 hereinafter referred to as the secondary rod, of which a rear end 13 is also also fixed in position, this secondary rod being also rotatable about a secondary pivot axis parallel to but distinct from the main axis, and passing through this rear end 13.
• the windscreen wiper further comprises a substantially L-shaped end link, a first side 30 of the "L” shape connecting the two other ends, referred to as the front ends, of the respective main and secondary rods 12 , and the other side 31 of the "L” shape carrying the wiper blade 2.
• the connections are provided so that the first side 30 of the "L” -shaped rod can pivot in the plane of the rods 10, 12 on the one hand, with respect to the secondary rod 12 and on the other hand, with respect to at the main rod 10 about distinct axes of rotation, substantially parallel to the main pivot axis and the secondary pivot axis, thereby causing the other side 31 of the "L” shape to pivot; .
• the end link 30, 31, the main rod 10 and the secondary rod 12 form, with the body of the vehicle, a deformable quadrilateral, and the blade 2 carried by the end link has an orientation relative to the main rods 10 and secondary 12 which varies according to the relative angular position of these rods during their rotational movement about their respective pivot axis.
• This variation of the orientation of the wiper is shown in FIG. 1 for three distinct positions of the wiper: a first rest position in which the arm / wiper assembly is substantially aligned with the lower edge of the windshield, an intermediate position, and an extreme position.
• a pantograph-type wiper in which this variation of the orientation of the blade is obtained.
• lateral end S as schematically show the intermediate position and the extreme position of Figure 1, between which the orientation of the blade is increasing.
• pantograph-type wiper is not always adapted to obtain a good quality of wiping.
• another criterion for obtaining quality wiping lies in the angle of attack of the blade, namely the inclination of the blade at its point of connection with the arm relative to the normal to the surface. windshield.
• pantograph wiper described above does not allow to vary the angle of attack as specified above, and in the case of a panoramic windshield, one can find, as illustrated in the figure 4a, with a broom 2 forming, at the level of the lateral zone, an angle of attack ⁇ with the normal N windshield much too important. This results in particular that the broom will not be positioned correctly in terms of angle of attack when it begins its scan back to the rest position.
• the present invention aims to improve the pantograph type wiper described above to increase the efficiency of wiping, even in the side end portions of the windshield.
• a wiper of the pantograph type in particular for a motor vehicle comprising a panoramic windshield, of the type comprising an arm carrying a broom and consisting of at least:
• a main rod movable in rotation around a main pivot axis passing through a rear end of the main rod;
• a connecting means connecting the front ends of the main and secondary rods so as to be pivotable in the plane of the rods relative to the main rod and to the secondary rod during rotational movements; of these rods around their respective pivot axis;
• the attachment means being rotatably connected to the connecting means in the plane of the rods so as to have an orientation relative to the rods which varies as a function of the relative angular position of the rod; these rods during their rotational movement about their respective pivot axis; characterized in that the arm further comprises control means for printing said fastening means rotational movement about an axis of rotation substantially perpendicular to the pivot axes so as to vary the angle of attack of the wiper relative to the normal windshield according to the relative angular position of these rods during their rotational movement about their respective pivot axis.
• the arm comprises a substantially "L" -shaped end link of which a first side forms the connecting means, and a second side of which integral in rotation of the first side, is connected to the fastening means so as to allow rotation of the attachment means about said axis of rotation
• the control means comprise a connecting rod connected on the one hand by means of attachment and on the other hand to an outgrowth one of the main or secondary rods so that the variation of the relative angular position of the main and secondary rods causes a translational movement of the connecting rod which consequently controls said rotational movement of the attachment means.
• the windscreen wiper further comprises an arm drive device comprising at least one electric motor having a main axis of alternating direction of rotation drive allowing the sweeping alternating said windshield between a rest position and an extreme position of the wiper, and control means of the operating mode of the arm for selecting, on at least one sector of the windshield, a mode of operation said circular, in which the main rod and the secondary rod are rotated about their respective pivot axis without variation of angular position relative to each other.
• an arm drive device comprising at least one electric motor having a main axis of alternating direction of rotation drive allowing the sweeping alternating said windshield between a rest position and an extreme position of the wiper, and control means of the operating mode of the arm for selecting, on at least one sector of the windshield, a mode of operation said circular, in which the main rod and the secondary rod are rotated about their respective pivot axis without variation of angular position relative to each other.
• FIG. 1 already described above, schematically illustrates the rest, intermediate and extreme positions, respectively, of a pantograph wiper of the prior art
• FIG. 3 is a perspective view of the wiper of FIG.
• FIGS. 4a and 4b illustrate the angles of attack of the wiper with respect to the normal of a windshield respectively in the case of a windshield wiper of the prior art, and of the wiper of the figures 2 and 3;
• FIG. 5 shows an exemplary possible embodiment of a device for driving the arm of a wiper according to a possible implementation of the invention
• FIG. 6 illustrates two scanning sectors obtained thanks to the drive device of FIG. 5.
• the windscreen wiper of FIG. 2 comprises an arm carrying a wiper blade 2, the arm consisting of at least:
• a secondary rod 12 rotatable about a secondary pivot axis, substantially parallel but distinct from the main pivot axis and passing through a rear end of the secondary rod not visible in Figures 2 and 3.
• a connecting means 30 connecting the front ends of the main and secondary rods 12 so as to be pivotable in the plane of the rods relative to the main rod 10 and to the secondary rod 12 during the rotational movements of these rods around their respective pivot axis.
• the axes of rotation are referenced respectively X and Y in FIG.
• main stem is here related to the fact that it is the rod whose rotational movement is controlled by the rotation of the drive shaft of an electric motor located in the drive device the wiper arm.
• the other rod is called secondary because its rotational movement is driven by that of the main stem.
• the arm also comprises a fastening means 31 to which is attached the blade 2, the fastening means 31 being integral in rotation with the connecting means 30 in the plane of the rods so as to have an orientation relative to the rods which varies according to the relative angular position of these rods during their rotational movement about their respective pivot axis. Consequently, according to a conventional mode of operation of a pantograph, the rotational movement of the main rod 10 about its pivot axis will cause, thanks to the connecting means 30, also a rotational movement of the secondary rod 12 around its pivot axis, and the parallelogram comprising the two rods 10, 12 and the connecting means 30 will be able to deform due to the possible pivoting about the X and Y axes. The relative angular position variation of the two rods resulting from this deformation will generate a proportional variation of the orientation of the attachment means.
• the arm further comprises control means 33, 34 for printing by the fastening means 31 a rotational movement about an axis of rotation A substantially perpendicular to the main pivot axes and secondary, and therefore to the axes of rotation X and Y so as to vary the angle of attack of the blade 2 relative to the normal windshield according to the relative angular position of these rods during their movement of rotation about their respective pivot axis.
• the arm comprises a substantially L-shaped end link of which a first side forms the connecting means 30, and a second side 32, integral in rotation with the first side, is connected to the fastening means 31 so as to allow rotation of the fastening means 31 about said axis of rotation A.
• the control means comprise a rod 33 connected on the one hand by means of attachment 31 and on the other hand to an outgrowth 34 of one of the main or secondary rods 12 so that the variation of the angular position relative of the main rods 10 and secondary 12 causes a translational movement of this rod 33 which consequently controls said rotational movement of the attachment means 31.
• the various movements are represented schematically by the solid arrows.
• the rod 33 controls the rotation of the attachment means 31, and the link 30, 32 is moved in the example by the secondary rod 12 of the arm, this movement causing a reaction at the connecting rod 33 which will cause the angle of attack to vary.
• the protrusion 34 comprises a fin attached to the main rod 10 and extending in a plane substantially parallel to the plane of the rods. Alternatively, it could be provided that this fin is attached to the rod.
• FIGS. 4a and 4b show the results obtained in terms of angle of attack in a lateral zone of a panoramic windshield, respectively with a wiper of the prior art, and with the wiper ice as described with reference to Figures 2 and 3. It is clearly seen in the figure
• the pantograph wiper according to the invention as just described may comprise a conventional drive device comprising a alternately rotated motor, the rotation of the drive shaft generates, via a transmission rod, the rotation of one of the rods of the shaft, for example of the main rod 10, around its main pivot shaft, and this, on the entire surface of the windshield to be wiped. It may however appear desirable to obtain this operation in pantograph mode only on certain portions of the windscreen sweeping, and more precisely at the level of the extreme lateral portion, the remainder of the sweep being made in a circular manner.
• an advantageous embodiment of the drive device which, in the given nonlimiting example, makes it possible to cut the scanning operation into two sectors: a first sector S1 (FIG. FIG.
• the drive device 5 of the arm comprises an electric motor having a main driving axis 50 with alternating direction of rotation permitting the alternating scanning of said windshield between a rest position and an extreme position of the wiper.
• the rotation of the drive shaft 50 due to the presence of a rod 51 for driving the movement of the arm, causes the rotation of the main rod 10 about its main pivot axis. passing through its rear end 11.
• the drive device 5 further comprises means for controlling the operating mode of the arm for selecting, on at least one sector of the windshield (in the example shown, on the sector S1), a so-called operating mode.
• circular in which the main rod 10 and the secondary rod 12 are rotated around their respective pivot axis without variation of angular position relative to each other.
• control means of the operating mode comprise a connecting rod
• the cam includes in the example two zones of different profiles:
• a first zone 53a corresponding to the so-called circular operating mode, with a predefined non-circular profile thanks to which the control rod 54 controls the rotation of the rod 52 so as to prevent any variation in the relative angular position of the main rod 10 and of the secondary rod 12, since the rotational movement of the link 52 compensates for any relative movement of the rods;
• FIG. 6 illustrates the two scanning zones S1 and S2 obtained with a windscreen wiper according to the invention provided with a drive device as described in FIG. 5.
• a windscreen wiper according to the invention provided with a drive device as described in FIG. 5.
• other sectors of the windshields in which the correction of the position and the angle of attack of the blade is desirable, in order to improve the quality of wiping. In this case, it is sufficient to provide as many cam profiles as necessary.
• control means for correcting the angle of attack of the blade according to the invention can be positioned in part pantograph, and not at the top as in the embodiment described with reference to Figures 2 and 3. More specifically, it can be provided that the control means for printing by means of attachment of the broom movement rotation about the axis of rotation substantially perpendicular to the pivot axes comprise a connecting rod connected near the rear ends main and secondary rods, firstly to the secondary rod, and secondly to a portion of the secondary rod may be rotated about said axis of rotation. This rod then behaves substantially like the connecting rod 33.
• the connections at the front ends of the main and secondary rods must be adapted to obtain the desired angle of attack variation.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Transmission Devices (AREA)
• Cleaning In General (AREA)

Applications Claiming Priority (2)

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• 2004
  • 2004-09-16 FR FR0409818A patent/FR2875196B1/fr not_active Expired - Fee Related
• 2005
  • 2005-09-15 US US11/662,837 patent/US20080141482A1/en not_active Abandoned
  • 2005-09-15 EP EP05784055A patent/EP1791734A1/de not_active Withdrawn
  • 2005-09-15 CN CNA200580034630XA patent/CN101039824A/zh active Pending
  • 2005-09-15 JP JP2007531681A patent/JP2008513272A/ja active Pending
  • 2005-09-15 WO PCT/EP2005/009941 patent/WO2006029870A1/fr active Application Filing

Non-Patent Citations (1)

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