WO2008040643A1

WO2008040643A1 - Wiper blade for cleaning a windscreen

Info

Publication number: WO2008040643A1
Application number: PCT/EP2007/059979
Authority: WO
Inventors: Lothar Trenkle; Heiko Volz; Stephan Mayer; Joachim Zimmer; Godelieve Kraemer; Juergen Rapp; Michael Kruse; Achim Kraus; Francois Schabanel
Original assignee: Robert Bosch Gmbh
Priority date: 2006-10-04
Filing date: 2007-09-20
Publication date: 2008-04-10
Also published as: DE102007033682A1; JP2010505685A; EP2076416A1; KR20090054456A

Abstract

The invention relates to a wiper blade (1) for cleaning a windscreen (2) having a support brace system (16) to which is attached a wiper strip (7) which has a wiper lip (3). A middle level (22) of the support brace system (16) and a middle axis (23) of the wiper lip (3) enclose an angle (β) which takes on different values over the length of the wiper blade (1).

Description

Wiper blade for cleaning a glass

State of the art

The invention relates to a wiper blade for a windshield wiper.

Known windshield wipers have a wiper arm, which is constructed of a fastening part and a hinged thereto via a hinged joint part with a wiper rod, the wiper blade during the pivoting movement over the

Slice leads. The wiper blade has a generally multi-membered support bracket system with parent and minor brackets, of which at least some with claws hold at their ends a wiper strip on the head strip. The multi-link suspension system and spring rails inserted in the head strip enable the wiper strip to be adapted to the even contact pressure of a curved windscreen during wiping. Such windshield wipers are e.g. known from DE 199 08 282 A1.

The support bracket system guides the wiper strip in a plane which is approximately perpendicular to the vehicle window and tilts a wiper lip connected to the wiper strip via a tilting web in the reversing positions of the windshield wiper in order to achieve a good wiping result in both wiping directions through a favorable angle of attack of the wiper lip to the vehicle window receive. For this purpose, the pivot axis of the windshield wiper is usually perpendicular to the vehicle window, so that the center plane of the support bracket system is perpendicular to the vehicle window. Since the vehicle windows have different curvatures in the wiping area, this is only true for one to some areas. From DE 42 11 326 Al it is known to entangle the wiper arm so that the deviation of the median plane of the support bracket system from the vertical over the wiper area is minimized. From EP 0 604 324 A1 it is known to incline the center plane of the support bracket system in that the wiper arm is fastened to its drive shaft at an adjustable angle. It is also known from DE 198 54 372 Al, by tilting the wiper arm and / or a corresponding arrangement of a Einhängekastens on the center bracket relative to the disc to tilt the center plane of the support bracket system over the length of the wiper strip constant angle, the approximately vertical center position of the However, by wringing the claws or cranked lug of the tilting bar, keep the wiper lip to the wiper strip.

Disclosure of the invention

In order to achieve a required value of the angle of attack of the wiper blade to the windshield, one needs a movable wiper axis, which optimally adapts the wiper lever in every wiping angle position of the disk curvature, especially with strongly curved windshields. However, today's wiper systems are screwed in the attachment points via a decoupling element fixed to the vehicle body. The wiper bearing shafts are rotatably mounted in a shaft which is connected via the decoupling elements with the attachment points. This rigid connection of the wiper bearing, which is required for a precise maintenance of the wiping angle, and the rigid connection of the wiper blade to the wiper arm, represent an obstacle to the dynamic change of the angle of attack of the wiper blade to the disc normal over the wiping angle course. The requirement of cleaning strongly curved Slices can not be met with today's wiper system concept. The object of the invention is therefore to provide an improved wiper blade. The idea underlying the solution to this problem is to influence the angle of attack and the laying behavior of the wiper lip. For this purpose, the wiper lip according to claim 1 is rotated about an axis parallel to its longitudinal axis, the rotation preferably following the course of the slice normal along the wiper strip. Advantageous developments of the invention will become apparent from the dependent claims.

The rotation of the wiper lip causes an adaptation of the actual to the required angle of attack of the wiper lip to the disc, resulting in an improved wiping result. In addition, the angles of attack on the inner and outer circuits are matched and the range of the normal error is reduced. As a result, the folding of the wiper lip in the reversal positions of the windshield wiper are facilitated and occurring noise is reduced.

In a preferred embodiment, the claws of the subordinate brackets are rotated at different angles relative to the median plane of the support bracket system in such a way that the wiper strip held by them undergoes a desired rotation over their length.

In a further preferred embodiment, the tilting ridge is fastened to the head strip under an angle that varies over the length of the wiper strip and thereby causes the wiper lip to rotate against the center plane of the support bracket system.

In a further preferred embodiment, the head strip of the wiper strip is made of a torsionally rigid material and rotated about an axis parallel to its longitudinal axis. Alternatively, the wiper strip is connected to a spring rail of torsion-resistant material, which has a twist and a desired rotation of the overall th wiper strip causes. In both cases, the individual claws of the subordinate bracket are either rotated according to the rotation of the wiper strip against the central axis of the support bracket system, or the claws grant the wiper strip held by them sufficient clearance to form the desired rotation.

In various variants of the invention, the rotation of the wiper strip over its entire length in ranges of 0 to 2 degrees, 2 to 4 degrees, or 4 to 6 degrees, the rotation per unit length in the range of 0 to 0.2 degrees per Centimeters lies. According to a preferred embodiment, the rotation per unit length is constant over the entire wiper strip. In another preferred embodiment, the rotation varies per unit length along the wiper strip to a particularly good adaptation to the

Achieve disc curvature. According to various embodiments, the wiper strip can be subdivided into two or three regions of different rotation per unit length. According to a preferred embodiment, the middle region of the wiper strip is more twisted than the outer regions. According to another preferred embodiment, the central region of the wiper strip is less strongly rotated than the outer regions.

The invention requires only minor changes to the geliu- figen design of a windshield wiper, which only small

Costs arise. In particular, a dynamic control of the wiper blade is dispensed with. The invention does not increase the space requirement of the windshield wiper and no additional wearing parts are required.

The invention will now be explained in more detail with reference to the accompanying figures. Brief description of the drawings

FIG. 1 shows a schematic side view of a wiper blade according to the invention with a wiper rod; FIG.

FIG. 2 shows a section through a wiper strip in the direction of the arrow II in FIG. 1; FIG.

FIG. 3 shows a section through a wiper strip in the direction of the arrow III in FIG. 1;

FIG. 4 shows a section through a wiper strip in the direction of the arrow IV in FIG. 1;

FIG. 5 shows a section through a wiper strip with spring rail in the direction of the arrow V in FIG. 1;

FIG. 6 shows a section through a claw arranged in a rotated manner and a wiper strip in the direction of the arrow VI in FIG. 1; FIG.

FIG. 7 shows a section through a wiper strip with a wiper lip attached at an angle to the head strip in the direction of the arrow VII in FIG. 1; FIG.

FIG. 8 shows a view of a wiper blade with two regions of different rotation per unit length in the direction of the arrow VIII in FIG. 1; FIG. ;

FIG. 9 shows a view of a wiper blade with three regions of different rotation per unit length in the direction of the arrow IX in FIG. 1. Embodiments of the invention

A wiper blade 1, as in FIG. 1, has a mounting bracket system 16 of superordinate brackets 17 and claw brackets 9 fastened thereto, which is connected to a wiper rod 10. The wiper rod 10 is movably mounted on a vehicle body. Through the various brackets 9, 17 of the support bracket system 16 and the wiper rod 10 extends an imaginary center plane 22, which is identical in Fig. 1 with the plane of the drawing.

The claw brackets 9 have at their ends claws 5, which hold a wiper strip 7. The wiper strip 7 consists of a head strip 6, to which a wiper lip 3 is attached via a tilting web 8. The claws 5 surround the head strip 6. At each position along the wiper strip 7, a central axis 23 can be thought of by the tilting web 8 and the wiper lip 3. The outer end of the wiper strip 7 sweeps over the outer circle of the wiper circle during the wiping movement, the inner end of the wiper strip 7 covers the inner circle.

The vehicle body has an opening in which a disc 2, for example, used as a windshield.

The disc 2 is curved in the surface. 2, 3 and 4 show the disc 2 at different positions along the wiper strip 7, wherein in the various areas the disc 2 has a different position with respect to the central plane 22 of the mounting bracket system 16. The wiper blade 1 is moved during the wiping of the disc 2 on the disc 2, wherein the center plane 22 of the support bracket system 16 along the wiper strip 7 occupy different angles to the surface of the disc 2. Since the wiping property of the wiper strip 7 and the Umlegeverhalten the wiper lip 3 depends on the angle between the O- berfläche of the disc 2 and the wiper lip 3, a different angular position of the wiper lip 3 along the wiper strip 7 with respect to the median plane 22 of the support bracket system 16 is advantageous. 2 shows a cross section through the wiper strip 7 in the outer region of the wiper strip 7. As shown in FIG. 2, the central axis 23 of the wiper lip 3 is rotated in the outer region of the wiper strip 7 by an angle β 2 in relation to the center plane 22 of the support bracket system 16, whereby the wiper strip 7 is arranged with the wiper lip 3 perpendicular to the disc 2. This angle changes along the wiper strip 7. In Fig. 3 it can be seen that the rotation in the middle region of the wiper strip 7 is an angle ß3. In the inner region of the wiper strip 7, the central axis 23 of the wiper lip 3 and the center plane 22 of the support bracket system 16 are rotated by an angle ß4 against each other, as shown in FIG. 4.

By the rotation is achieved that the wiper lip 3 in different areas of the disc 2, in which the disc 2 is arranged differently inclined, nevertheless has an approximately equal angle to the disc 2. In this way, different areas of the disc 2, which have different curvatures, can be wiped better. For example, the angle between the center axis 23 and the disk 2 is in the range between 85 ° and 95 °.

In order to achieve the rotation, the head strip 6 may be made of a sufficiently rigid material, such as a suitable plastic, and be permanently twisted. Alternatively, the head strip 6 can be connected, as in FIG. 5, to a spring rail 4, wherein the spring rail 4 is made of sufficiently rigid material, for example a metal, and permanently twisted about its longitudinal axis. The spring rail 4 may be executed as in Fig. 5 as elongated cuboid and extend inside the head strip 6.

But it can also have other shape and, for example, run outside of the header 6. It can also be used several spring rails 4. The rotation of the spring rail 4 is transmitted by the connection with the head strip 6 on the sufficiently flexible wiper strip 7. The head te 6 encompassing claws 5 grant the wiper strip 7 either enough leeway to form the desired rotation, or they are mounted at a variable along the wiper strip 7 angle to the median plane 22 of the support bracket system 16 to the claw brackets 9, as shown in Fig. 6. Claw 18 is attached, for example, at an angle ßl, claw 19 at a different angle. It is also possible to turn a sufficiently flexible wiper strip 7 directly through claws 5 attached at different angles, as in FIG.

In a further embodiment as in Fig. 7, the tilting ridge 8 is fixed under an over the length of the wiper strip 7 variable angle to the header 6 and thereby causes a desired rotation of the wiper lip 3 against the median plane 22 of the support bracket system 16. In this embodiment, all Claws 5 be attached at the same angle to the claw brackets 9 of the support bracket system 16.

The wiper lip 3 may have a uniform rotation per unit length. The rotation per unit length can also vary in different areas of the wiper lip 3. For example, as shown in FIG. 8, the wiper lip 3 may have an outer portion 11 and an inner portion 12, each having a different twist per unit length. Further, the wiper lip 3, as shown in Fig. 9, outer, middle and inner portions 13, 14, 15 have different rotation per unit length. The rotation may be such that the rotation per unit length in the region 14 is greater than the rotation per unit length in the regions 13 and 15. According to another embodiment, the twist per unit length in region 14 may be smaller than that in regions 13 and 15. In addition, the angle between the central axis 23 of the wiper lip 3 and the median plane 22 of the mounting bracket system 15 in the different sections 11, 12, 13, 14, 15 different, but in each case partially kon- have constant values and change only in transition areas.

Claims

claims

1. wiper blade (1) for cleaning a disc (2) with a support bracket system (16) on which a wiper strip (7) is fixed, which has a wiper lip (3), characterized in that a median plane (22) of Support bracket system (16) and a central axis (23) through the wiper lip (3) an angle (ß) include, which assumes different values over the length of the wiper blade (1).

2. wiper blade (1) according to claim 1, characterized in that the wiper strip (7) via two spaced retaining means on the support bracket system (16) is fixed, and the rotation of the wiper lip (3) is achieved in that the individual holding means to different angles (ß) are rotated against the median plane (22) of the support bracket system (16).

3. wiper blade (1) according to claim 1, characterized in that the wiper strip (7) has a head strip (6) which is connected via a tilting web (8) with the wiper lip (3), and that the rotation of the wiper lip (3) is achieved in that the tilting web (8) over the length of the wiper strip (7) is formed differently.

4. wiper blade (1) according to claim 1, characterized in that the wiper strip (7) has a head strip (6), with which the wiper lip (3) is connected, and that the rotation of the wiper lip (3) by a rotation of the header (6) is effected.

5. wiper blade (1) according to claim 1, characterized in that the wiper strip (7) has a head strip (6), with which the wiper lip (3) is connected, and that with the head strip (6) has a twisted spring rail (4). comparable is bound, which determines the rotation of the wiper lip (3).

6. Wiper blade (1) according to one of the preceding claims, characterized in that the rotation over the entire length of the wiper lip (3) is in a range of 0 to 2 degrees.

7. Wiper blade (1) according to one of the preceding claims, characterized in that the rotation over the entire length of the wiper lip (3) is in a range of 2 to 4 degrees.

8. Wiper blade (1) according to one of the preceding claims, characterized in that the rotation over the entire length of the wiper lip (3) is in a range of 4 to 6 degrees.

9. wiper blade (1) according to one of the preceding claims, characterized in that the rotation takes place uniformly over the entire length of the wiper strip (7).

10. wiper blade (1) according to any one of the preceding claims, characterized in that the rotation per unit length over the length of the wiper strip (7) is variable.

11. wiper blade (1) according to claim 10, characterized in that the wiper lip (3) has at least two sections (11) and (12) with different rotation.

12. wiper blade (1) according to claim 10, characterized in that the wiper lip (3) has at least two sections with different rotation per unit length.

13. wiper blade (1) according to claim 12, characterized in that the wiper lip (3) in the central region a large re twist per unit length than in the end regions.

14. wiper blade (1) according to claim 12, characterized in that the wiper lip (3) in the central region has a lesser twist per unit length than in the end regions.