FR2976237A1 - INSTALLATION OF VEHICLE WIPER - Google Patents

Abstract

Vehicle wiper assembly having a wiper arm (3) for wiping a direct drive window. The installation comprises stops (30, 31) on the vehicle to limit the minimum travel and the maximum travel of the wiper arm (3).

Description

FIELD OF THE INVENTION The present invention relates to a vehicle windscreen wiper system having a wiper arm for wiping a direct drive window by a drive installation. STATE OF THE ART Vehicle windscreen wiper systems are known whose drive installation in the form of a windscreen wiper motor directly drives the windscreen wiper arm. In these wiper systems with windshield wiper arms operating in opposite directions, for example, each arm has its wiper motor. The wiper motors are connected directly to the wiper arm. This makes it possible to move the wiper arm accurately without mechanical coupling. The usual, bulky linkage transmission for the second wiper arm is thus omitted. Such a wiper motor, also called direct drive, is shown in detail in FIG. 1. The plate of the windscreen wiper motor is connected to the body of the vehicle at connection points so that only drive shaft or the wiper shaft protrudes from the coach. The wiper arm is attached directly to the drive shaft. This arm is partially shown in the direction of its inner side in Figure 3. There are two stops inside the fastener which, when the windscreen wiper arm is installed, arrive on the stop members or on a stop slider of the deck of the wiper motor in the installed position. Figure 3 shows the stop member or the stop slide in broken lines. However, it reaches the stop member only if the windscreen wiper motor loses its recognition position and is converted in the worst case into a rotary engine. The stops of the wiper arm safely prevent such defective operation. DESCRIPTION AND ADVANTAGES OF THE INVENTION The subject of the present invention is a windscreen wiper installation of the type defined above, characterized in that it comprises stops installed on the vehicle to limit the minimum travel and the maximum travel of the vehicle. wiper arm.

The wiper installation according to the invention has the advantage of developing a simpler embodiment, using a conventional wiper arm, not incorporating a stop. Advantageously, this results in a saving in weight in the production of aluminum fasteners, in particular a reduction of 50% of the aluminum used for melting under pressure. But it is also possible to make the sheet metal fastener. In addition, it is advantageous for the wiper arm, standard, under the stops, to be of smaller construction than with integrated stops. Advantageously, to disassemble the wiper arm, a conventional extractor is used. The removal of the stops of the wiper arm makes it possible to have a better seal between the lid or the gate of the water box, directly at the wiper shaft of the windscreen wiper motor. . It is furthermore advantageous that the tolerances of the wiper arm do not influence the stop positions actually encountered. Likewise, the positional tolerances of the screw point of the wiper motor to the vehicle do not influence the stop positions of the wiper arm. According to an advantageous development of the windscreen wiper installation, the limit stop limiting the minimum movement of the wiper arm is practically horizontal, close to the wiper arm in its storage position and the limit stop limiting the windscreen wiper arm. Maximum travel of the wiper arm is virtually vertical, close to the wiper arm in its inverting position. This effectively locks the wiper arms for safety reasons and this results in a simpler construction. Advantageously, the two stops are close to the point of rotation of the wiper arm, in particular they are located in the first third of the wiper arm adjacent to the attachment part of the wiper arm. -ice cream. Blocking by the stops will be effective if the length of the stops is parallel to the wiper arm or its fastener. According to a simple embodiment of the invention, the horizontal abutment and the vertical abutment are located in the

3 zone of the lid of the vehicle water box and the realization will be simple if the two stops are formed in the lid of the water box. Drawings The present invention will be described in more detail below with the aid of an exemplary embodiment of a windscreen wiper system shown in the accompanying drawings in which: FIG. 1 is a top view of a wiper motor according to the state of the art, before its installation, the figure being shown with a view of the plate of the wiper shaft and the fixing member, FIG. perspective view of the windscreen wiper motor installed according to FIG. 1 with its wiper shaft and the abutment member projecting from the cover of the water box, on the vehicle side, FIG. a view from below of a portion of a wiper arm according to the state of the art prior to installation on the wiper motor of FIGS. 1 and 2, showing the underside integrating two stops in the FIG. 4 is a view of a vehicle equipped with a wiper installation according to the invention. , and Figure 5 is an enlarged view of a detail of Figure 4 with installation of the wiper arm and the two vehicle-side stops according to the invention. DESCRIPTION OF AN EMBODIMENT OF THE INVENTION A windscreen wiper system according to FIG. 4 comprises, for example, two wiper arms 3, 4 rotating in the opposite direction or in the same direction to wipe the windscreen wiper. Breeze 5 of a vehicle 1. Each wiper arm 3, 4, also called the wiper lever, is equipped with a wiper blade 6, 7 applied against the window (cover breeze) 5 for scraping the water and / or dirt attached to the window 5 by a rotational or pivoting movement of the wiper arm 3, 4. Each wiper arm 3, 4 is driven by a respective drive unit or wiper motor functioning as a reversible motor driven in different directions of rotation;

The reversible motors are preferably direct motors connected directly to the windscreen wiper arm 3, 4 and constituting an installation of the windscreen wiper arm 3, 4. two-engine wiper. The drive wiper arm 3, 4 is thus done without mechanical coupling, that is to say that it eliminates the usual bulky linkage. The control electronics couple the two wiper motors. Such wiper motors 2 are known according to the state of the art with reference to FIGS. 1 and 2. The plate 10 of the wiper motor 2 is connected to the connection points 11, 12 of the vehicle body so that only the drive shaft or drive shaft 8 exceeds the vehicle side. The drive shaft 8 is integrated in an attachment zone 15 protruding from the plate 10, made in the form of a stud or cylinder for the wiper arms 3, 4. The wiper arm 3 4 attaches directly to the drive shaft 8 so that the attachment area 15 of a fastening head 17 of the wiper arm 3, 4 shown in Fig. 3 and which has a cap shape or sleeve, is covered (knurled cone connection). A screw connection 20 applied to the wiper shaft 8 as shown in FIG. 5 then ensures attachment to the wiper shaft 8. The knurling 18 shown in FIG. 2 for the wiper shaft 8 windscreen wiper 8 produces, in known manner, a rotation integral with the windscreen wiper arms 3, 4 or the fastening head 17. FIG. 3 shows a detail of the windscreen wiper arm 3, 4 and its head fastening 17, seen from the inner side 21 of the fixing head 25. There are two stops 22 of triangular or hook-shaped shape 22 inside the fastening head 17 which arrive on a fastener 23 or a thrust slide of the plate 10 of the wiper motor 2. FIG. 3 shows a stop member 23 in the form of a ring-ring segment or of a fixing slide (represented in broken lines) and which protrudes from the upper surface 24 tapering conically of the attachment zone 15 shown in Figure 2. To arrive on the fastener 23 with the stops 22 of the wiper arm 3, 4, it is necessary that the wiper motor 2 loses its position detection and that in the case the most disadvantageous, it turns into a rotary engine. The stops 22 of the wiper arm 3, 4 prevent such a malfunction in complete safety. In FIGS. 4 and 5, the same references as in FIGS. 1 to 3 have been used to designate the same elements or elements of the same function. The windscreen wiper system comprises a wiper motor of a shape similar to that of FIGS. 1 and 2 and which, nevertheless, comprises a fastening zone 15 without abutment member or thrust collar. Suitably, a standard wiper arm, not shown, without a stop integrated in the attachment head is normally fastened by a nut directly to the wiper shaft. The removal of the stops of the wiper arm or the fastener 23 of the plate 10 advantageously allows a better seal between the cover 33 directly to the wiper shaft 8 of the wiper motor. 2. According to Figure 5, the cover 33 arrives at the attachment zone 15 for the wiper arm 3 in a conical shape. Since no stop means interferes with the direct sealing path on the wiper shaft 8, a non-detailed seal can be installed on the wiper shaft 8 to seal it in the wiper shaft 8. Fixing 17. The stops 30, 31 are, according to the invention, on the wiper arm 3, 4 but on the side of the vehicle, on the body or the cover 33 of a box of water 34 under the windshield 5, for example being integrated. This makes it possible to eliminate the abutment member 23 or the stop slide of the plate 10 of the windscreen wiper motor 7 as has been shown in FIGS. 1 and 2. To explain it, the box of FIG. water 34 in Figures 4 and 5 partially without its cover 33. In Figure 4, the wiper arm 3 is shown by way of example for the stops 30, 31 according to the invention. The wiper arm 3 moves from its substantially horizontal storage position 36 and thus the wiper blade 6 is oriented horizontally substantially in the longitudinal direction 40 of the window 5 towards the right ; by its maximum deflection, it reaches its high inversion position 37. The inverting position 37 is aligned substantially vertically in the transverse direction 41 of the window 5. From here, the wiping continues

6 again to the left where the broom arrives in its low inversion position or the storage position 36 to return the movement and continue. The wiper arm 3 is shown in dashed lines in FIGS. 4 and 5 for its high inversion position 37. The stop 30 limiting the minimum movement of the wiper arm 3 is substantially horizontal, close to the position of the wiper arm 3. storage 36 or close to the region of the foot 16 of the wiper arm 3 in its storage position 36. The stop 31 limiting the maximum movement of the wiper arm 3 is substantially vertical near the position io d ' 3. As can be seen in greater detail in FIG. 5, which is an enlarged part of the right wiper arm 4 of FIG. 4, the stops 30, 31 are relatively wide. close to the point of rotation 50 or the drive shaft 8 of the wiper arm 4 in the region of the fastener connecting the foot 16 to the attachment head 17. Starting from the total length L of the wiper arm 4 according to FIG. 4, considered from the point of rotation 50 to the point of articulation / attachment 51 of the wiper blade 6, substantially a segment less than one third of the total length L of the wiper arm 3 (in the exemplary embodiment there is it is about 1/6) arrives at the middle M of the horizontal abutment 30. The vertical abutment 31 is even closer to the point of rotation 50 and lies in a range substantially less than 1/6 of the total length L of the wiper arm 3 (in the exemplary embodiment, this corresponds substantially to 1/12). As indicated by the arrow 52 of FIG. 5, during normal operation there remains a distance (d) between the wiper arm 3 and the stop 30 or 31. Only in case of defect and loss of position detection that actually the wiper arm 3 coming against one of the abutments 30, 31. The stops 30, 31 can in these conditions be called blocking stops. The function of the stops 30, 31 is to ensure that the wiper arms 3, 4 are not likely to be displaced beyond the column A, 25 of the vehicle 1. If this were the case, the engine The windscreen wiper 2 could lose its position sensing capability and operate as a rotary engine, which would result in a risk of injury and damage to the vehicle 1. Thus, it is necessary to

7 in case of defect of the windscreen wiper motor 2 to stop this faulty operation, which is done with the stops 30, 31 according to the invention. However, the stops 30, 31 are only active if there is a malfunction or a fault of the wiper motor 2.

The abutments 30, 31 have, for example, different lengths or bearing zones 61, 62. The abutments 30, 31 have for example the shape of a quadrangle and the side with the abutment or bearing zone 61, 62 is the shortest side. The length 61 of the horizontal abutment 30 is more than twice the bearing length 62 of the vertical abutment 31. The wiper arm 3 has a slightly curved shape and its foot 16 is slightly oblique with respect to the longitudinal direction 40 of the window 5 at the point of rotation. The support lengths 61, 62 are parallel to the windscreen wiper arm 3 or to its foot 16 in the storage position 36 or to the wiper arm 3 in its inverted position 37 to have an air gap. support 61, 62 as large as possible, that is to say a linear contact as large as possible. The stops limit the movement of the fastener so that the stops intervene even if the wiper arm is folded down. The foot 16 is foldably connected to the fastener because it carries the fixing head 17. The stops 30, 31 or locking elements are integrated in the vehicle 1. The stops 30, 31 are preferably integrated in the cover 33 of the water box 34 and are for example made with the plastic material of the lid 33. The stops 30, 31 may also be installed in a different manner on the vehicle 1, for example 25 in the form of a separate piece fixed to the bodywork. The lid 33 of the water box may also be in the form of a grid or slats and as in the embodiment, have at least a portion 35 having a grid structure or slats. The material of the cover 33 of the water box as well as that of the stops 30, 31 is for example a plastic material. The two abutments 30, 31 can also be made by shaping the plastic or from the plastic of the lid 33 of the water box or be made of another material and be fixed as separate parts. But it is also possible to use other techniques

8 nics plastics such as injection or the like to achieve the lid of the water box 33 with the stops 30, 31. Alternatively, the stops are further away from the point of rotation 50. One could thus consider for example d installing the vertical stop 31 next to the window 5 directly on the column A 25. As shown in Figure 5, the horizontal stop 30 is substantially in the middle of the articulation 9 of the wiper arm 3 while the vertical stop 31 is closer to the point of rotation 50 between the point of rotation 50 and the articulation 9 of the wiper arm. As presented above, the solution according to the invention can also be applied to oppositely operating windscreen wiper systems. The invention can also be applied to wiper systems with parallel operation. The invention applies to windscreen wiper installations of vehicles, especially motor vehicles.

9 NOMENCLATURE

1 Vehicle 2 Wiper Motor 3 Wiper Arm 4 Wiper Arm 5 Windshield 6 Wiper Blade 7 Wiper Blade Io 8 Drive Shaft Motor Platen windscreen 11 Connecting point 12 Connecting point Fixing area 15 17 Wiper arm fixing head 18 Knurling Screw connection 21 Inner side of fixing head 22 Stop 20 23 Fixing member 24 Top surface Column A Horizontal stop 31 Vertical stop 25 33 Cover 34 Water box 36 Storage position 37 High reverse position 40 Longitudinal direction 30 41 Transverse direction 50 Rotation point 51 Hinge point / attachment point of the wiper blade -glace 52 Arrow 61 Bearing length / bearing area 62 Bearing length / bearing area

Claims (1)

CLAIMS 1 °) Installation of vehicle wiper comprising a wiper arm for wiping a direct drive window by a drive installation, characterized in that it comprises stops (30, 31) installed on the vehicle to limit the minimum travel and maximum travel of the wiper arm (3). 2) Wiper system according to claim 1, characterized in that the stop (30) for limiting the minimum movement of the wiper arm (3) is substantially horizontal, close to the storage position. (36) of the windscreen wiper arm (3) and the stop (31) for limiting the maximum wiper arm (3) to be almost vertical, close to the inverting position ( 37) of the wiper arm (3). Windscreen wiper installation according to Claim 2, characterized in that the two abutments (30, 31) are close to the point of rotation (50) of the windscreen wiper arm (3), in particular in the windscreen wiper arm (3). adjacent first third of the wiper arm (3). 4. Windscreen wiper installation according to claim 2, characterized in that the length (61, 62) of the stops (30, 31) is directed parallel to the windscreen wiper arm (3) or to its workpiece. fixing (16). Windscreen wiper installation according to claim 1, characterized in that the horizontal stop (30) and the vertical stop (31) are in the region of a water box cover (33) of the vehicle. (1). 35 °) Wiper installation according to claim 5, characterized in that the two stops (30, 31) are formed in the lid (33) of the water box.