WO2000030907A1

WO2000030907A1 - Wiper blade for cleaning the window of a vehicle

Info

Publication number: WO2000030907A1
Application number: PCT/DE1999/002266
Authority: WO
Inventors: Joachim Zimmer; Ulrich Metz
Original assignee: Robert Bosch Gmbh
Priority date: 1998-11-25
Filing date: 1999-07-23
Publication date: 2000-06-02
Also published as: DE19854372A1

Abstract

The present invention relates to a wiper blade for cleaning the window (68) of a vehicle and including a support bracket system (10) that comprises several members. This system comprises a central bracket (12) as well as secondary brackets (14, 16) which are directly or indirectly connected to the central bracket (12) by hinges. Some at least (16) of the secondary brackets are used for supporting a wiper blade (44, 88) by its upper profile (46, 90) using a plurality of claws (18, 78) provided at their ends. A lip (48, 94) is connected to said upper profile by a tilting junction member (50, 92). The hinge axes (32, 34) extend across the central plane (38) of the support bracket system (10). According to this invention, the central plane (38) of the support bracket system (10) defines with a central plane (52) extending through the tilting junction member (50, 92) an angle (β) that varies between 90 and 178°.

Description

Wiper blade for cleaning a vehicle window

State of the art

The invention is based on a wiper blade for cleaning vehicle windows according to the preamble of claim 1.

Known windshield wipers have a wiper arm which is constructed from a fastening point and an articulated part articulated thereon with a wiper rod. A hook-shaped end of the wiper rod engages a hook-in box of a wiper blade, which is arranged between two side cheeks of a Mitτ-egg ball, and comprises a hinge pin. The joint thus formed guides the wiper blade over the vehicle window during the pivoting movement. The wiper blade has a hinged m usually mehrgliedeπges Tragbugelsystem with integrally on the Mittelbugel ^¬ subordinate Bugein, of which at least some of it with claws on their ends a wiper strip to the top strip. The mehrgliedeπge Tragbugelsystem m and the header inserted spring rails allow that during wiping, the wiper strip having a uniform ground pressure ^¬ a curved windshield conform. Such wipers are known for example from DE 37 44 237 AI. With simplified designs, subordinate brackets can be used, too Intermediate bracket and claw bracket called, omitted. In the simplest case, the center ball itself has claws with which it holds the wiper strip.

The support bracket system guides the wiper strip on a plane that is approximately perpendicular to the vehicle window and about which a wiper lip connected to the wiper strip via a tilting web tilts in the reversed positions of the wiper, in order to achieve a good wiping result in both wiping directions due to a favorable angle of inclination of the wiper lip to the vehicle window receive. For this purpose, the pivot axis of the window wiper is generally perpendicular to the vehicle window, so that the center plane of the support bracket system also extends perpendicular to the vehicle window. Since the vehicle windows have different curvatures in the wiping area, this only applies to some areas. From DE 42 11 326 AI it is known to interlock the wiper arm so that the deviation of the median plane of the support bracket system from the vertical over the wiping area is as small as possible. It is also known from EP 0 604 324 AI to incline the center plane of the support bracket system in that the wiper arm is attached to its drive shaft at an adjustable angle.

In order to support the folding process of the wiper lip in the end positions of the swiveling movement of the wiper blade, the

Wiper axis slightly inclined to the vehicle window. By a suitable choice of the axis inclination, the inclination of the center veins of the support bracket system to the vehicle window changes over the wiping area, so that it deviates about five degrees from the vertical in the park position and in the reverse position in each case in the direction of the subsequent wiping movement. During the journey, when the wiper is not actuated, the wiper arm and the wiper blade are in an unprotected parking position, namely in a so-called hood gap between an engine hood and the vehicle's windshield. The width of the hood gap essentially depends on the height of the wiper blade and the wiper arm in the wiping direction. Since the hood gap should be as narrow as possible for optical and electrical engineering reasons, a flat design is sought.

If the windscreen wiper is actuated, it swivels from the parking position used by the wmd to the dj-e wmdscnutzscfte and the bracket of the carrying handle system is flowed around by the fan. Turbulence, increased wind resistance and wind noise occur. As the noise in the vehicle interior is progressively reduced, the noise that comes into contact with the add-on parts due to the flow around the vehicle is more clearly audible and is particularly annoying if it occurs intermittently, as with the windshield wiper, during wiping.

Furthermore, the flow and turbulence cause buoyancy forces which reduce the contact pressure of the wiper blade on the windshield at high driving speeds and degrade the wiping quality. If one interprets the contact pressure for high speeds, it is at low speeds too large with the result that forces caused too much friction, which enhance tern to the council ^¬ wear and tilt. It is known to attach a wmdleit device, a so-called spoiler, to the wiper blade, which directs the fan wind over the wiper blade and increases the contact pressure as a function of the driving speed. Advantages of the invention

According to the invention, the median plane of the support bracket system includes an angle β with a median plane through the tilting web, which is 90 ° to 178 ° and preferably lies in a range between 130 ° to 150 °.

While the center plane of the support bracket system can be tilted very far, in particular more than five degrees, in the direction of flow toward the vehicle window and maintains an acute angle in the entire wiping area by interlocking the wiper arm and / or a corresponding arrangement of a hook-in box on the center bracket, the approximately vertical center position remains the wiper lip to the vehicle window due to the selected angle ß, so that a good wiping result is guaranteed. At the same time, the overall height resulting from the hook-shaped end of the wiper rod and the support bracket system is greatly reduced in the wiping direction, as a result of which the hood gap can be made narrower. In addition, the air resistance is due to the lower

Wind attack area reduced. The side cheeks of the stirrups, which are exposed to the wind, act as wind deflectors and generate a contact force that increases with the driving speed.

The angle β can be achieved in a simple manner by cranking the claws of the subordinate brackets to the vehicle window hm.

Another solution is that the Kippsteg the

Wiper strip is attached to the head strip, the Kopflei ^¬ ste at least in its lower region partially hm is cranked to the vehicle window. This allows the gelsyste brought even closer to the Fanrzeugscneiioe and the overall height and the air resistance can be further reduced. Due to the kinematics of an inclined wiper axis, the center plane of the support bracket system pivots around the support edge of the wiper lip, the parts of the wiper blade experiencing a greater change in distance from the vehicle window, the greater their distance from the support edge. If, for example, a spoiler is connected to the wiper blade, the distance between the lower edge of the spoiler and the vehicle window can become so great due to the lifting movement that the head wind flows under the spoiler and creates a buoyancy force and swirls on the rear of the wiper blade. In addition, the wmd noises increase.

In the design according to the invention, due to the inclination of the center plane of the support bracket system, the spoiler connected to the center bracket can run essentially parallel to the center plane, since the spoiler already has a sufficient inclination to the vehicle window at its connection point with the wiper blade. Seme broadsides can thus run essentially straight and parallel to the side cheeks of the center bracket. They are therefore short and the distance between the contact edge of the wiper lip and the lower edge of the spoiler is very small. It follows from this that even with an inclined arrangement of the swivel axis of the windshield wiper, the lower edge of the spoiler carries out only a slight lifting movement during the wiping movement and can therefore be brought up to the vehicle windshield up to a small distance. The gap between the lower ante of the spoiler, which can be formed by a soft, additional spoiler lip, and the vehicle window is so small that an underflow of the spoiler lip is no longer to be feared. The conditions are still good in the execution according to the second claim. stiger, since the crank is only provided in the area between the headrail and the wiper lip.

According to an embodiment of the invention, the hook-in box is arranged laterally offset in the upstream direction behind the central bracket. This reduces the overall height, the inflow cross section and the air resistance of the wiper blade and prevents turbulence on the rear of the wiper blade. This effect is reinforced by the fact that the hook box is closed on the side facing away from the vehicle window. This avoids sharp edges that could contribute to injuries, swirling and noise. There is an opening for the wiper rod opposite the closed side. This has a hook-shaped end which is bent away from the fan lens and comprises a hinge pin in the hanging box. In addition to the advantages in terms of electrical engineering, the upward-closed envelope box also offers visual advantages.

drawing

Further advantages result from the following description of the drawing. Exemplary embodiments of the invention are shown in the drawing. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into useful further combinations. Show it :

1 is a perspective view of a wiper blade according to the invention without a wiper strip,

Fig. 2 is a view in the direction of arrow II

1. FIG. 3 shows a perspective illustration of a wiper blade according to the invention with a wiper lip attached at an angle to a wiper strip, and FIG. 4 shows a view in the direction of arrow IV

Fig. 3.

Description of the exemplary embodiments

In the embodiment variants, parts with the same effect are identified with the same reference symbols. Furthermore, because of the clarity of the perspective figures, the illustration of a spoiler 54 has been omitted.

A wiper blade has a support bracket system 10 which has a center bracket 12 and subordinate brackets in the form of two intermediate brackets 14 and a plurality of claw brackets 16. The central bracket 12 is articulated to the intermediate brackets 14 via hinge pins 28, while the claw bracket 16 is articulated at the ends of the central bracket 14 by hinge pins 30. The hinge pins 28, 30 and the associated hinge axes 34 and 36 run transversely to a central plane 38 of the support bracket system 10 (FIG. 2 and FIG. 4). This runs in the upstream direction 62 of a driving wind 60 inclined at an angle α to a vehicle window 68. The claw balls 16 have claws 18, 78 at their ends, which hold a wiper strip 44, 88 on the head strip 46, 90 thereof. The wiper strip 44, 88 also has a wiper lip 48, 94 which is connected to the head strip 46, 90 via a tilting web 50, 92. The tilting web 50, 92 causes the wiper lip 48, 94 to fold over depending on the wiping direction and thus follows a central plane 52 through the tilting web 50, 92. The flipping process of the ischlippe 48, 94 can be favored by an inclination of the swivel axis of the windshield wiper, since the center plane 52 through the tilting web 50, 92 m makes the end positions of the swivel movement a slightly smaller angle of attack than 90 ° m of the new wiping direction. Therefore, according to the invention, depending on the position of the center plane 38 of the support bracket system 10, an angle β between 90 ° and α 178 ° is selected, which the center plane 38 and the center plane 52 include through the tilting web 50, 92. The angle β can be approximately 180 ° minus the angle α.

The center bracket 12 has a hanging box 20, 80. In the embodiment according to FIGS. 1 and 2, the Emnange box 20 is laterally offset and is arranged behind the center bracket 12 in the upstream direction 62, while in the embodiment according to FIGS. 3 and 4 is arranged between side cheeks 40, 42 of the central bracket 12. The hook-in box 20 is closed on the side 70 opposite the vehicle window 68 and has an opening 72 on the opposite side, through which a wiper rod 74 engages with its hook-shaped end 76 and comprises a hinge pin 26 which extends transversely to the side walls 22, 24 of the hanging box 20 and is arranged essentially parallel to the vehicle window 68. The hook-shaped end 76 and the hinge pin 26 form a hinge with a hinge axis 32. The wiper rod 74 guides the wiper blade over the vehicle window 68 in accordance with the pivoting movement. In the embodiment according to FIGS. 3 and 4, a wiper arm 82 carries the wiper blade 84 with its wiper rod 84 by engaging with a hook-shaped end 76 between the side cheeks 40, 42 of the central bracket 12 and encompassing the hinge pin 26 which extends transversely to the central plane 38 of the support bracket system 10 is arranged. In order to incline the central plane 38 of the support bracket system 10 toward the vehicle window 68, the wiper arm 82 is correspondingly interlocked with its wiper rod 84.

A spoiler 54 is provided on the center bracket 12 on the upstream side of the support bracket system 10. Its broad side 56 is aligned essentially parallel to the central plane 38 of the support bracket system and the adjacent side cheek 40 of the center bracket 12. At its end facing the vehicle window 68, it has an additional spoiler lip 58 made of a soft material, which reaches the vehicle window 68 up to a small distance 66. Because of a small distance 64, 96 between the lower boundary of the spoiler lip 58 and the contact edge of the wiper lip 48, 94, the gap between the spoiler 54 and the vehicle window 68 defined by the distance 66 can be kept very small over the entire wiping area, so that there is no fear that the wind will flow under the spoiler 54.

The aerodynamic profile of the spoiler 54 adjoins the closed side 70 of the hanging box 20 in the upper region of the middle bracket 12 (FIG. 1 and FIG. 2), which ensures a good overflow of the wiper blade and prevents turbulence on the back. that will. Besides a good drag coefficient is gekasten 20 and the wiper rod ^¬ leaf lying in the inflow direction 62 behind the wiper 74 is also apparent by the laterally offset arranged Einhän ^¬ a closed by the Page 70 limited, very small flow cross-section. As a result of the small overall height of the support bracket system 10 in the direction of wiping, a hood gap (not shown) can be kept narrow.

Reference sign

10 Carrier system 56 broadside

12 middle bracket 58 spoiler lip

14 intermediate bracket 60 wind

16 claw bracket 62 flow direction

18 claw 64 distance

20 hanging boxes 66 distance

22 side wall 68 vehicle window

24 side wall 70 side

26 hinge pin 72 opening

28 pivot pin 74 wiper rod

30 hinge pin 76 hook-shaped end

32 joint axis 78 claw

34 Articulated axis 80 hanging boxes

36 Articulated axis 82 Wiper arm

38 center plane 84 wiper rod

40 side cheek 86 hook-shaped end

42 side panel 88 wiper strip

44 wiper strip 90 head strip

46 header 92 tilting bar

48 wiper lip 94 wiper lip

50 Kippsteg 96 distance

52 center plane α angle

54 spoiler ß angle

Claims

Expectations

1. wiper blade for cleaning a vehicle window (68) with a multi-member support bracket system (10), which has a center bracket (12) and with this directly or indirectly connected by joints, subordinate bracket (14, 16), at least some (16) with claws (18, 78) at their ends hold a wiper strip (44, 88) on its head strip (46, 90), to which a wiper lip (48, 94) is connected via a tilting web (50, 92), whereby the articulated axes (32, 34) extend transversely to a central plane (38) of the support bracket system (10), characterized in that the center plane (38) of the support bracket system (10) has a center plane (52) through the tilting web (50, 92) Includes angle (ß) that is 90 ° to 178 °.

2. Wiper blade according to claim 1, characterized in that the claws (18) of the subordinate bracket (16) to the vehicle window (68) are cranked out.

3. Wiper blade according to claim 1, characterized in that the head strip (90) at least in its lower region is cranked in areas relative to the vehicle window (68).

4. The wiper blade according che with claim, characterized in that the angle (ß) 130 ° to 150 ° ^¬ be carries out.

5. Wiper blade according to one of the preceding claims, characterized in that a spoiler (54) is attached to the central bracket (12), the broad sides (56) of which run substantially parallel to the central plane (38) of the supporting bracket system (10).

6. Wiper blade according to claim 5, characterized in that the spoiler (54) has an additional spoiler lip (58) made of soft material on the lower side.

7. Wiper blade according to one of the preceding claims, characterized in that a hanging box (20) with a hinge pin (26) between side walls (22, 24) for articulating a wiper rod (74) laterally offset, in the flow direction (62) behind the center bracket ( 12) is arranged.

8. Wiper blade according to one of the preceding claims, characterized in that the suspension box (20) on the side (70) which faces away from the vehicle window (68) is closed and on the opposite side an opening (72) for one Wiper rod (74) on ice.