DE19650929C2 - Windshield wiper for a windshield of a motor vehicle - Google Patents

Description

The invention relates to a windshield wiper Protective window of a motor vehicle with a drive axis swiveling wiper arm, which by means of a coupling steers carries a wiper blade provided with a wiper rubber, or with a wiper blade holding a squeegee.

Windshield wipers for motor vehicle windscreens well known. Such a wiper has one a drive shaft lockable wiper arm on his free end carries a wiper blade by means of a coupling joint, on which a squeegee is attached. The coupling joint for ver binding of the wiper arm with the wiper blade is halfway there Length centered on the wiper blade. The wiper blade has several longitudinal bridge sections, which ensure a uniform Distribution of the contact pressure of the wiper arm on the squeegee act on different length ranges of the squeegee.

From DE-OS 22 23 898 it is also known to have a squeegee in Arrange a flexible retaining bar that is part of a wiper leaf is. The flexible holding bar is by means of several Longitudinal bridge links, which also form part of the wiper blade  represent it via a coupling joint with the wiper arm bindable.

FR 2 660 267 discloses a wiper for a power vehicle in which a two-part wiper blade on a Wi is arranged with low shear. The two-part wiper blade points to Holder of the squeegee on two spring bracket arrangements.

It is also known (EP 0 678 428 A1), a wiper egg Nes motor vehicle to provide two wiper blades a common wiper arm are arranged.

Finally, it is known (US 3,623,183), a squeegee for egg NEN wiper of a motor vehicle on an elastic to arrange the flexible and concave prestressed first part, the with an also elastically flexible, convex pre-tensioned, second part is in operative connection. Both parts are in one Wiper arm arranged. Due to the different elastic Bending stresses are possible, both flat and strong to wipe curved disc surfaces properly by each an essentially constant contact pressure over the total te length of the squeegee is achieved.

The object of the invention is a wiper at the beginning to create the type mentioned, which is a significantly simplified Ge design and still allows a good wiping quality light.

This object is achieved in that the wiper arm of the coupling joint at an end area of the Wi cutter blade attacks, and that the coupling joint guide means for transferring lateral forces from the wiper arm to the wiper sheet for the application of contact pressure and spring means for Applying the off-center attack of the wiper arm equal torque on the wiper blade in the direction of Windshield are assigned. By the invention  The solution is one that is clear compared to the prior art che shortening of the wiper arm, which reduces weight of the wiper and a reduction in the overall height of the Windshield wipers cause the wiper arm to attack no longer over the wiper blade at the front end area must grab. This also results in a more aerodynamic Ge durability of the wiper, especially for high Vehicle speeds to improve wiping quality action can lead.

In an embodiment of the invention is the Koppelge as spring means steer assigned at least one leg spring. This is a be particularly simple, yet functionally reliable design, by means of the desired torque on the wiper blade can be brought.

In a further embodiment of the invention, the spring means Adjustment elements for adjusting the height of the to be applied Torque assigned. This makes it possible to stop the spring means, in particular the at least one thigh the one to make it variable. Maggots can be used as adjustment elements screws or plastically deformable intermediate elements his.

In a further embodiment of the invention, the coupling joint between wiper arm and wiper blade and / or a swivel steer the wiper arm in the area of the drive axis locking or Stop elements for holding the wiper blade and / or the Wi low shear in a swung away from the windshield Assigned rest position. This makes it possible to use the disc wi shear in a folded rest position, in which the Windshield is freely accessible.

The object of the invention is also achieved in that the Wiper blade is designed as a carrier profile that around its Center of gravity longitudinal line at least essentially torsionally rigid,  but is designed to be flexible. This makes it possible the wiper blade in a simple manner through the support profile form, directly on a wiper arm over a corresponding Coupling joint can attack without the wiper blade additional che longitudinal bridge members must have. The torsional stiffness of the carrier profile ensures that the frictional force of the wiping lip on the surface of the window across the length of the squeegee not to twist the support profile and thus the Wi cutting blade leads, which affects the wiping quality could be. The flexible design of the support profile ensures a good adjustment of the wiper blade at the same time different curvatures of the surface of the lens Windshield. This is particularly advantageous in this way simply designed wiper blade with the attack of the wiper arm at the front end area of the wiper blade and thus the Carrier profile combined, making it an extremely simple and weight-reduced wiper assembly results.

In a further embodiment of the invention, the carrier profile two in a common plane - in the functional position of the Wiper blade parallel to the window surface - lying flat arranged, strip-like profile legs that the squeegee mi flan along its entire length on opposite sides kier, and which traverse the length through a squeegee crossbar bracket are interconnected. Thereby becomes a deep focus of the carrier profile - on the Schei Covered surface - achieved, the twists of the wearer profiles caused by the frictional force of the wiper lip on the Schei ben surface arise, at least largely turns off. At the same time, the torsional moment is transferred to the beam pro fil relevant lever arm reduced, the support profile rela tiv is located just above the windshield. A ver drilling of the carrier profile and thus the wiper blade largely avoided by this configuration.  

In a further embodiment of the invention, the cross bridges bracket a variety of at regular intervals the arranged, in profile U-like bridges, which the Cover the squeegee across and secure it with holding elements of the squeegee. These are advantageous Holding elements in one piece with the bridges. By being together the spaced bridge bridges will secure the Squeegees achieved, while at the same time sufficient bending elasticity of the support profile is maintained. The too spaced-apart bridges also create space me, the improved flow around the wiper blade in particular enable at high speeds, which the Windscreen wipers have an improved aerodynamic design and resulting especially at high driving speeds has an improved wiping quality. Taking off the Wi cutting blade from the disc is thus also at high speeds avoided.

In a further embodiment of the invention, the bridge holder with several to each other in the longitudinal direction of the carrier profile rows of openings in which the squeegee means corresponding locking elements can be determined. The breakthroughs ge ensure an aerodynamically favorable design of the wiper sheet analogous to the previously described embodiment. Since the Squeegee can be fixed directly in the openings, that shows Wiper blade just a simple and therefore inexpensive Building on. The design of the bridge bracket through the fore hen openings in the carrier profile ensures a simple Producibility of the carrier profile from a continuously tepid fenden semi-finished product in the form of an extruded profile or the like, into which the openings are punched and side contours are punched to modi the bending stiffness along the length fection.

In a further embodiment of the invention, the squeegee is included integrally formed, of which are opposite the wiper lip  the side protruding locking knobs provided in the breakthrough chen of the support profile can be determined. The locking knobs protrude thorny from the squeegee.

In a further embodiment of the invention, the locking knobs are the Art matched to the dimensioning of the breakthroughs that the Locking knobs can be locked in the openings. The definition of the squeegee in the carrier profile is done in a simple manner an impression of the locking knobs in the openings of the Trägerpro files without the help of a tool.

In a further embodiment of the invention, the profile legs on their outwardly protruding long sides with slide supports provided, at least partially in the direction of the disc top protrude surface. These slide supports in the form of runners or tippers supports reduce the tilting of the support profile depending on the loading direction of movement of the wiper lip to a defined level, whereby torsion of the beam profile is further reduced.

In a further embodiment of the invention, the carrier profile is included Provide cross cuts to increase its flexibility. This makes it easy to adapt the Trä with simple means to different curvatures of the disc surface surface of the windshield.

In a further embodiment of the invention, the carrier profile along its length with a curvature that is greater than the curvature of the disc surface. This makes it possible uniform over the entire length of the carrier profile To achieve contact pressure in the direction of the windshield. The Achieving a uniform contact pressure in the direction of Windshield over the entire length of the support profile also by introducing the torque into the coupling gels ke between drive axle and wiper arm or between wiper arm and wiper blade integrated leg springs.  

In a further embodiment of the invention, the wiper rubber is on Carrier profile glued or vulcanized. This is one easy fixing of the wiper rubber on the carrier profile without the Use of additional fasteners possible.

Further advantages and features of the invention result from the Subclaims. Below are preferred embodiments described the invention and Darge with reference to the drawings poses.

Fig. 1 shows a front view of a windscreen of a passenger car, which is associated with a windscreen wiper according to the invention, a first embodiment,

Fig. 2 in a longitudinal section view of the arrangement of the ticket benwischers of FIG. 1 in a wiping position on the windshield of Fig. 1,

Fig. 3 in an enlarged representation of a detail of a Wi of the wiper 1 shear blade of FIGS. 2 and,

Fig. 4 shows a cross section through the wiper blade of FIG. 2 ent long the line IV-IV in Fig. 2,

Fig. 5 shows an enlarged plan view of the free front end of the wiper blade of FIGS. 1 and 2,

Figure 6 shows another embodiment tenansicht. Of a windshield wiper according to the invention in a partially broken-Sei,

Fig. 7 is a plan view of the wiper of FIG. 6,

Fig. 8 shows a cross section through the window wiper according to FIGS. 6 and 7, bearing in the region of a squeegee Wi shear blade,

Fig. 9 is an enlarged sectional view of an upper Haltebe reaching the wiper blade according to FIG. 8,

Fig. 10 shows an enlarged plan view of a section of the wiper blade of FIGS. 6 and 7 in a front end region,

Fig. 11 shows an enlarged plan view of a detail of a further embodiment of a windshield wiper OF INVENTION to the invention in the range of a wiper blade similar to FIG. 10,

Fig. 12 is a cross section through the wiper blade of FIG. 11 taken along section line XII-XII in Fig. 11,

Similarly Fig. 13 shows a detail of a wiper blade FIGS. 12 and

Fig. 14 shows a further detail of a wiper blade similar to FIGS. 12 and 13.

A windshield wiper 3 , 4 , 5 , 6 , 7 according to FIGS. 1 to 5 is part of a windshield wiper system for cleaning a windshield 1 of a passenger car. The windshield wiper is moved by a drive motor, not shown, in a manner known per se about a drive axis 2 in oscillating pivoting movements over a windshield surface of the windshield 1 . The windshield wiper has a shaft attachment 3 , which can be fixed on a drive shaft rotatable about the drive axis 2 . To the shaft attachment 3, a wiper arm 5 is fixed by means of a coupling joint 4, wherein the coupling joint 4 is shaped hinge as a hinge that allows pivotal movement of the wiper arm 5 about a paral Lele to the disk surface of the windshield 1 pivot axis. In the hinge joint 4 , a leg spring is integrated, which exerts a torque on the wiper arm 5 in the direction of the windshield 1 . In the hinge joint 4 , a stop and / or a locking position is also integrated, which allows the wiper arm 5 to be folded away from its functional position according to FIG. 1 into a resting position protruding from the windshield 1 . The wiper arm 5 protrudes substantially radially to the drive axis 2 from the shaft attachment 3 .

The wiper arm 5 has, at its joint to the hinge 4 opposite the front end of a further coupling joint in the form of a hinge joint 6 carrying a wiper blade. 7 The hinge joint enables a pivoting movement of the wiper blade 7 about a pivot axis which is aligned parallel to the pivot axis of the hinge joint 4 . The wiper arm 5 engages by means of the hinge joint 6 on the radially inner end face of the wiper blade 7 , the hinge joint 6 being laid out in such a way that lateral forces are transmitted to the wiper blade 7 to achieve a sufficient contact pressure during the wiping movement of the windshield wiper. Also integrated in the hinge joint 6 is a leg spring similar to the leg spring 12 according to FIG. 6, which exerts a torque on the wiper blade 7 . The torque is such that the off-center attack of the wiper arm 5 at the front end of the wiper blade 7 is balanced with the effect of the uniform line load of the wiper rubber on the window.

As can be seen from Fig. 2, the wiper blade 7 has a Trä gerprofil 8 , on which the hinge joint 6 engages, and in which a squeegee 9 is held over its entire length. The carrier profile 8 has a relatively high torsional stiffness over its length, but is designed so flexible that it can easily adapt to the different curvatures of the windshield surface when wiping over the windshield 1 . The torsional rigidity of the carrier profile 8 prevents the wiper blade 7 from being twisted, which can be caused by the frictional force of the wiper lip on the windshield surface which acts over the entire length of the wiper rubber 9 . The carrier profile 8 has a strip-shaped, flat base body which extends in its functional position on the windshield 1 parallel to the surface of the pane. The width of the base body is considerably larger than the width of the wiper rubber 9 . The squeegee 9 is provided with a multiple T-profile, the upper T-legs of the squeegee 9 being clamped in retaining brackets 11 of the carrier profile 8 , which are integrally formed on the carrier profile 8 . The Hal tebügel 11 protrude from the base body of the support profile 8 down to the windshield 1 and engage behind the obe ren T-leg of the squeegee 9 , which protrudes from the base body down to the windshield 1 . The bracket 11 he stretch to both sides of the squeegee 9 over the total length of the carrier profile 8 , the bracket 11 on both sides by several at regular intervals along the Trä gerprofiles 8 consecutive transverse cuts 10 are broken. These semicircular cross cuts 10 increase the bending flexibility of the support profile 8 , since the cross cuts 10 , which are provided in each of the two retaining brackets 11 at the same height, weaken the bending stiffness of the support profile 8 .

As can be seen from FIGS. 1 and 5, the wiper blade 7 tapers and in particular the carrier profile 8 towards the free end of the wiper blade 7 , which increases the bending strength of the carrier profile 8 towards the free end of the wiper blade 7 .

The windshield wiper according to FIGS. 6 to 10 also has a shaft attachment 3 which can be fixed on a drive shaft which can rotate about the drive axis 2 . On the shaft attachment 3 , a wiper arm 5 a is fixed via a hinge joint 4 , which projects essentially radially to the drive axis 2 from the shaft attachment 3 . The wiper arm 5 a carries a hinge joint 6 a at its free end face a wiper blade 8 a, 9 a, the Wi scissor arm 5 a based on the longitudinal axis of the wiper blade 8 a, 9 a attacks off center, but without - as in the previously described embodiment - To attack at one end of the wiper blade 8 a, 9 a. The hinge joint 6 a is provided with a leg spring 12 , which compensates for the off-center attack of the wiper arm 5 a by the appropriate application of an adapted torque. The wiper blade 8 a, 9 a has a Trä gerprofil 8 a, which is also torsionally stiff and pliable GE and is made from a continuously produced extrusion profile. The squeegee 9 a held in the carrier profile 8 a in a manner described in more detail below is provided with a double-T profile, with a series of at uniform intervals along the length on the top of the upper leg of the squeegee 9 a the squeegee 9 a mutually arranged locking knobs 13 are provided. The locking knobs 13 are integrally formed on the squeegee 9 a.

The squeegee 9 a is held in the area of its locking knobs 13 on its top in the carrier profile 8 a, the Trägerpro fil 8 a has two profile legs 15 which flank the squeegee 9 a on both sides and up to the level of the upper T-leg of Squeegees 9 a are pulled down. The two profile legs 15 are each designed strip or strip-like and arranged flat in a common plane parallel to the surface of the window, whereby they protrude to the outside on opposite sides. The two profile legs 15 are connected to one another by a wiper rubber 9 a overlapping bridge holder, which has an essentially U-shaped profile.

As shown in FIGS. 8 and 10 can be seen, are in the Brückenhal esterification provided in the plan view of X-shaped punch-outs 14, alternate the two in the longitudinal direction of the carrier profile 8 a zueinan of spaced apart and towards each other directed retaining tongues defi. These holding tongues are shaped in a manner not shown of the type crescent or sickle-like that they can each engage behind a locking knob 13 with a positive fit. This makes it possible to insert the squeegee 9 a in a simple manner from below between the profile legs 15 and to latch the locking knobs 13 by simply pressing them in between the tongues of the punched-outs 14 . The centering is achieved by the sickle-like contours of the tongues in the punched-outs 14 .

Since the profile leg 15 are positioned at a relatively short distance above the wafer surface, the support section 8 are tilted only limited in a wiping movement of the wiper a can, thus a favorable angle of attack for the wiper lip of the wiper blade rubber a is achieved. 9 The bending of the squeegee 9 a depending on the wiping direction of the windshield wiper is limited by its profile, since the lower T-legs come into contact with the adjacent upper T-leg depending on the wiping direction, so that this also allows only a limited setting of the wiper lip . The design of the support profile 8 a by the provision of two profile legs 15 , which are integrally formed on the webs of the bridge bracket, ensures a relatively high torsional rigidity for the support profile 8 a. The punched-outs 14 , which extend over the entire width of the bridge holder, at the same time create a relatively high bending elasticity.

The wiper blade of FIGS. 11 and 12 is similar to the Wi shearing blade according to FIGS. 6 to 10 designed. This Wi cutter blade has a carrier profile 8 b, which is provided with a bridge holder 17 and two molded on the front ends of the bridge holder 17 profile legs 16 . In this exemplary embodiment, however, the bridge holder is formed by a series of bridge webs running at regular intervals over the length of the carrier profiles 8 b parallel to one another and transversely to the longitudinal direction of the carrier profile 8 b, which are essentially U-shaped and in the region of the free Close the ends of the U-legs in one piece to the profile legs 16 . The profile legs 16 are aligned like the profile legs 15 of the previously described embodiment in a common plane parallel to the disc surface. The carrier profile 8 b carries a squeegee 9 b, which is designed as a double-T profile. The upper T-legs of the squeegee 9 b serve to hold the squeegee 9 b in the carrier profile 8 b. For this purpose, each bridge web 17 is provided with two parallel to the Profilschen 16 legs at the same height inwardly projecting retaining webs 18 , which limit a receiving portion for the upper T-leg of the squeegee 9 b in such a way that the T-leg of the squeegee 9 b in this Receiving section can be clamped. The buckling of the wiper lip of the squeegee 9 b is limited in the exemplary embodiment according to FIGS . 11 and 12 by the distance of the lower T-leg to the retaining webs 18 , since the lower T-leg depending on the wiping direction on the underside of the respective retaining web 18 come to the plant.

In order to largely prevent additional tilting of the carrier profile 8 b due to the frictional force of the wiper lip on the windshield surface of the windshield 1 , legs 16 of the carrier profile 8 b in the exemplary embodiment according to FIG. 13 are additionally assigned with skids 19 in both profiles. When exporting approximately example of FIG. 14, each profile leg 16 Anstel le a skid 19 is a tilt support 20, which are slightly different to that of the runners 19, but which fulfill the same function substantially.

The anti-tippers 20 can also be further developed in such a way that they are occupied with masses that detune a frequency of the wiper blade or rubber on the window.

Claims (18)

1. Windscreen wiper for a windshield of a motor vehicle with a pivotable about a drive axis wiper arm, which carries a verse with a squeegee henes wiper blade by means of a coupling joint, characterized in that the wiper arm ( 5 ) by means of the coupling joint ( 6 ) on a front end region of the wiper blade ( 7 ) engages and that the coupling joint guide means for transmitting transverse forces from the wiper arm ( 5 ) to the wiper blade ( 7 ) for exerting a contact pressure and spring means ( 12 ) for applying a torque which compensates for the eccentric attack of the wiper arm on the wiper blade ( 7 ) are assigned in the direction of the windshield ( 1 ). 2. Windscreen wiper according to claim 1, characterized in that at least one Schenkelfe of ( 12 ) is assigned as the spring means to the coupling joint ( 6 ). 3. windshield wiper according to claim 1 or 2, characterized in that the spring means adjusting elements for adjusting the height of the torque to be applied are assigned. 4. Windshield wiper according to at least one of the preceding claims, characterized in that the coupling joint ( 6 ) between the wiper arm ( 5 ) and the wiper blade ( 7 ) and / or a swivel joint ( 4 ) of the wiper arm ( 5 ) in the region of the drive axis ( 2 ) locking or stop elements for holding the wiper blade ( 7 ) and / or the wiper arm ( 5 ) are assigned to a rest position pivoted away from the windshield ( 1 ). 5. windshield wiper for a windshield of a motor vehicle according to at least one of claims 1 to 4 or with a wiper blade holding a wiper blade, characterized in that the wiper blade is designed as a carrier profile ( 8 , 8 a, 8 b) which at least around its longitudinal center of gravity is essentially torsionally rigid, but is designed to be flexible. 6. Windshield wiper according to claim 5, characterized in that the carrier profile ( 8 a, 8 b) is designed such that one of the center of gravity associated thrust center line over the length of the carrier profile ( 8 a, 8 b) at least approximately at the level of the windshield Windshield ( 1 ) runs. 7. Windshield wiper according to claim 5 or 6, characterized in that the carrier profile ( 8 a, 8 b) two in a common plane - in the functional position of the wiper blade parallel to the surface ben ben - flat, strip-like profile legs ( 15 , 16 ) , which flank the squeegee ( 9 a, 9 b) over its entire length on opposite sides, and which are connected to one another over their length by a cross-bridge holder ( 14 , 17 , 18 ) which carries the squeegee ( 9 a, 9 b). 8. Windshield wiper according to claim 7, characterized in that the cross bridge holder has a plurality of at regular intervals from each other, in profile U-like bridge lands gen ( 17 ) which span across the squeegee ( 9 b) and with holding elements ( 18 ) are provided to fix the squeegee ( 9 b). 9. Windshield wiper according to claim 7, characterized in that the bridge holder with several in the longitudinal direction of the carrier profiles ( 8 a) lined up openings ( 14 ) is provided, in which the squeegee ( 9 a) by means of corresponding detent elements ( 13 ) can be fixed. 10. Windshield wiper according to claim 9, characterized in that the squeegee ( 9 a) with integrally molded, from the opposite side of the wiper lip protruding locking knobs ( 13 ) is provided, which can be fixed in the openings of the carrier profile ( 8 a). 11. A screen wiper according to claim 10, characterized in that the locking nubs (13) in such a surface on the dimensioning of the Durchbrü are matched (14), that the locking nubs (13) are locked in the apertures (14). 12. Windscreen wiper according to at least one of claims 7 to 11, characterized in that the profile legs ( 15 , 16 ) are provided on their outwardly projecting longitudinal sides with slide supports ( 19 , 20 ) which at least partially protrude in the direction of the window surface. 13. Windscreen wiper according to at least one of claims 5 to 12, characterized in that the carrier profile ( 8 ) is provided with transverse incisions ( 10 ) to increase its flexural flexibility. 14. Windshield wiper according to at least one of claims 5 to 13, characterized in that in the wiper blade torsional stabilizing and flexible Metal inserts are integrated. 15. Windshield wiper according to at least one of claims 5 to 14, characterized in that the bending elasticity of the wiper blade ( 8 , 8 a, 8 b) decreases to a least one end face. 16. Windscreen wiper according to claim 15, characterized in that the carrier profile ( 8 , 8 a, 8 b) of the wiper blade tapers to the we at least one end. 17. Windscreen wiper according to at least one of the preceding claims, characterized in that the carrier profile ( 8 , 8 a, 8 b) is provided in its unloaded rest position over its length with a curvature that is greater than the curvature of the surface of the window. 18. A wiper according to claim 7, characterized in that the wiper rubber is glued or vulcanized to the carrier profile is.