WO2013057005A1

WO2013057005A1 - Wiper blade

Info

Publication number: WO2013057005A1
Application number: PCT/EP2012/069912
Authority: WO
Inventors: Bart Vankerkhove
Original assignee: Robert Bosch Gmbh
Priority date: 2011-10-21
Filing date: 2012-10-09
Publication date: 2013-04-25
Also published as: EP2768705A1; CN103857568B; DE102011084955A1; CN103857568A

Abstract

The invention relates to a wiper blade for wiping windows (10), in particular windows (10) of motor vehicles, comprising a main extension direction (12), a rubber elastic wiper strip (14) that can be applied to the window (10) to be wiped, and a carrying unit (22), wherein the wiper strip (14) is retained on the carrying unit (22) substantially parallel to the main extension direction (12) in an operationally ready assembly state, and a covering unit (28) attached to the carrying unit (22) for covering at least part of an upper face (26) of the carrying unit (22). According to the invention, the wiper blade has at least one output element (36) for producing an output force (62) that is directed substantially toward the window (1) by a relative wind during a drive in an operationally ready installed state, wherein in the operationally ready installed state, the relative wind flows around the output element (36) at least in a section (38) that is contiguous in the main extension direction (12) both on a side (40) of the output element (36) facing the window (10) and on a side (42) of the output element (36) facing away from the window (10).

Description

description

title

wiper blade

The present invention relates to a wiper blade according to the preamble of claim 1.

State of the art

A wiper blade for wiping windows of a motor vehicle is known from DE 100 07 800 A1, which comprises a rubber-elastic wiper strip, which has a main extension direction, and a support unit with a spring rail, wherein the wiper strip in an operative assembly state parallel to the main extension direction at the Spring rail is held. The wiper blade further comprises a cover unit for covering a side facing away from the disc side of the support unit. The cover unit can have a spoiler or be designed as such to avoid an underflow of the wiper blade.

DISCLOSURE OF THE INVENTION The present invention relates to a wiper blade for wiping

Discs, in particular of panes of motor vehicles, having a main extension direction, a rubber-elastic wiper strip which can be applied to the pane to be wiped and a support unit, the wiper strip being held in an operative assembly state substantially parallel to the main extension direction on the support unit, and with one the carrying unit attached cover unit for covering at least part of a upper side of the carrying unit. In this context, a "main extension direction" is to be understood as meaning, in particular, a direction which runs parallel to an outer edge of the wiper blade and in which the wiper blade has its largest dimension. Under a "ready-to-assemble assembly state" in this context, in particular a state of the

Wischblatts be understood in which all components of the wiper blade are assembled according to design.

It is proposed that the wiper blade has at least one output element for generating an operating state during a drive of the motor vehicle by a wind substantially directed to the disc output force, wherein in the operational state of installation, the output element at least in a related in the main extension direction section both one of the disc facing side of the output element as well as on a side facing away from the disc

Output elements is flowed around by the wind. In this context, a "ready-to-use installation state" should in particular be understood to mean a state of the wiper blade in which the design-assembled wiper blade is installed at a location of the motor vehicle intended for this purpose. In this context, a "side facing the pane" is to be understood as meaning, in particular, that part of an outer surface of the output element which is detected in an operative state of installation by an imaginary projection beam emanating therefrom in a direction perpendicular to a central region of the pane and all elements In this context, a "side facing away from the disk" is to be understood as meaning, in particular, that part of the outer surface of the output element which is not detected by the imaginary projection light beam. In this context, the term "circulated by the wind" is to be understood in particular to mean that the airstream is split in a stationary state of the flow on an outer surface of the driven element, flows along the surface of the driven element and reunites in the flow direction behind the driven element.

With a suitable design, this can be achieved by generating a force directed onto the disk by the wind on the driven element. bar, which increases with increasing speed and effectively prevents lifting of the wiper blade from the disc. Thus, a wiper blade having an improved behavior of preventing lift-off from the wheel at a high traveling speed can be provided.

If the side of the at least one output element facing the disk has a convex curvature in a plane perpendicular to the main extension direction, the force directed onto the disk can be generated in a structurally particularly simple manner.

In the same way, it is advantageous if the side of the at least one output element facing away from the disk has a concave curvature in the plane perpendicular to the main extension direction. In this case, the side facing away from the disc of the at least one output element in the plane perpendicular to the Haupterstreckungsnchtung have both a side part with a convex curvature and a side part with a concave curvature. As a result, the output element can be made structurally particularly simple, compact and without sharp edges potentially posing a safety risk in the event of an impact event.

If the side of the at least one output element facing the disk has an exclusively convex curvature in the plane perpendicular to the main extension, a structurally particularly simple and compact solution can likewise be provided.

A directed to the disc force is at a suitable design on

Output element by the wind advantageously also generated when the disc facing side of the at least one output element in the

Hauptestreckungsnchtung vertical plane has a border length, which is greater than a border length of the disc side facing away from the at least one output element in this plane. Furthermore, it is proposed that in the ready installation state the

Output element and the cover unit in the direction of the disc from each other spaced apart. As a result, good flow around the output element can be ensured, and the output wind can effectively produce an output force directed toward the disk on the output element.

With particular advantage, a support unit is arranged between the driven element and the cover unit, which comprises at least two individual supports. This allows a good flow around the driven element by the wind and at the same time a secure mounting of the output element to the cover unit can be achieved.

In addition, it is proposed that at least two of three elements of a group formed by the output member, the support unit and the cover unit are integrally formed. By "one-piece" in this context should in particular be cohesively connected, as understood, for example, by a welding process and / or gluing process or another process familiar to a person skilled in the art, and particularly advantageously formed, such as by the production from a casting and / or by the production In this way, a secure mounting of the integrally formed elements and a cost-effective production thereof can be achieved.

A favorable drag coefficient and low noise development can advantageously be achieved if the at least one output element has a section facing the travel wind, whose cross-sectional area in the plane which is perpendicular to the main extension is bounded by a circular section. In addition, in this embodiment, the portion of the output element facing the airstream in the case of the impact event for a human is not a security risk.

This advantage also applies in the event that the at least one output element has a section facing away from the airstream, whose cross-sectional area in the plane which is perpendicular to the main extension is bounded by a circular section.

When a radius of the circle portion that bounds the windward facing portion is greater than a radius of the circle portion corresponding to the Boundary facing away from the wind, the force directed at the windscreen can be generated by the wind on the driven element in a particularly simple manner.

In addition, it is proposed that, in an operational state of assembly, a circle center of the circle section which borders the section facing the airstream is located closer to the disk than a circle center of the circle section which borders the section facing away from the air stream. As a result, a particularly simple solution for generation of the force directed onto the windscreen by the travel wind on the output element can be provided.

drawing

Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the invention is shown. 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 meaningful further combinations.

Show it:

1 shows a wiper blade according to the invention in a half-side partial view, FIG. 2 shows a sectional view of the wiper blade according to FIG. 1 along a line A - A ', and FIG

Fig. 3 is a detail view of an output element of the wiper blade in a

View according to FIG. 2.

Description of the embodiment

Fig. 1 shows a wiper blade for wiping a window 10 of a motor vehicle in an operative state of installation in a half-side partial view. For clarity, existing end caps are not shown at the ends of the wiper blade. The wiper blade has a disk to be wiped 10 can be applied, rubber-elastic wiper strip 14, which is arranged along a main extension direction 12 of the wiper blade. The wiper strip 14 comprises a wiper lip 16, which is connected via a tilting web to a head strip 18 of the wiper strip 14 (FIG. 2). In the operational installation state, the wiper lip 16 rests on the disk 10 (FIG. 1).

In the embodiment shown here, a wiper strip is shown with tilting web. In principle, however, the wiper blade could also be equipped with a tilt-free wiper strip.

Parallel to the main extension direction 12, the wiper strip 14 is held on a support unit 22, which comprises a band-like, resilient mounting rail 24 in a known manner, which engages in longitudinal grooves 20 of the head strip 18 (FIG. 2). The elastic support rail 24 protrudes on both sides beyond the head strip 18 of the wiper blade.

In a middle section of the carrying unit 22, a connection device (not shown) for counter-connecting means of a wiper arm movable between reversing positions is arranged on an upper side facing away from the pane 10 in the operative installation state. Suitable connection devices are known from the prior art and will therefore not be explained in detail here. The connection device may include a hinge unit for adjusting a relative position of the wiper blade with respect to the wiper arm. In principle, however, the connection device can also be designed without hinges.

As a mechanical protection of the wiper strip 14 and to cover an upper side 26 of the support unit 22, the wiper blade on a cover 28 made of plastic. The cover unit 28 has claw elements 30 formed on longitudinal sides which run parallel to the main extension direction 12 in an operational assembly state. The cover unit 28 is attached to the support unit 22 by the claw elements 30 engage around the side of the header 18 projecting support rail 24. In FIG. 1, on a side facing away from the disc 10, a support unit 32 produced integrally with the cover unit 28 in an injection molding process as well as an airfoil-shaped output element 36 (FIG. 1) likewise produced in the injection molding process in one piece with the cover unit 28 are shown, wherein the Support unit 32 in the ready-installed state in the direction of

Disc 10 is disposed between the output element 36 and the cover unit 28.

The support unit 32 includes four individual supports 34 oriented radially to the main extension direction 12 (of which two individual supports 34 are shown in FIG. 1), by means of which the driven element 36 and the cover unit 28 are arranged spaced apart from one another in the direction of the pane 10 in the ready-for-installation state , The output member 36 includes in the operational state of installation one of

Disc 10 facing side 40 and a side facing away from the disc 10 42 Fig. 2).

As can be seen from Fig. 1, the output member 36 is in the ready-installed state in the main extension direction 12 contiguous sections 38 between the individual supports 34 both on the disc 10 facing side 40 of the output element 36 and on the side facing away from the disc 10 42 Output element 36 flows around freely from a running wind, which arises during a drive of the motor vehicle. Since the support unit 32 comprises four individual supports 34, there are three contiguous sections 38 of this type between the individual supports 34. In addition, contiguous sections 38 of the output element 36 at both ends of the wiper blade are also in the main extension direction 12 on both the side facing the window 10 and 40 on the side facing away from the disc 10 42 flows around unhindered.

FIG. 2 shows a sectional view of the wiper blade along a line AA 'according to FIG. 1, in a plane oriented perpendicular to the main extension direction 12. In the ready-for-installation state of the wind would be expected from a Fahrtwindrichtung 60, which runs in Fig. 2 substantially from top right to bottom left. In the direction perpendicular to the main extension direction 12 plane, the disc 10 facing side 40 of the output element 36 has an exclusively convex curvature. The side facing away from the disc 10 42 of the output element 36, however, has both a first side part 44 with a convex curvature and a second side part 46 with a concave

Buckle up (Fig. 3).

In a section of the output element 36 facing the travel wind, its cross-sectional area in the plane oriented in FIG. 2, oriented perpendicular to the main extension direction 12, is of a first circular section

48 bounded. A section of the output element 36 facing away from the travel wind has, in the plane oriented perpendicular to the main extension direction 12, a cross-sectional area which is bounded by a second circle section 50. In this case, a radius of the first circular section 48 is greater than a radius of the second circular section 50. In that shown in FIG. 2, ready for operation

In the installed state, a first circle center 52 of the first circle section 48 is spaced closer to the disc 10 than a second circle center 54 of the second circle section 50. In a border of the cross-sectional surface of the output element 36 in the in

3, perpendicular to the main extension direction 12 aligned plane is a first Umrandungslänge 56 of the disc 10 facing side 40 of the output element 36 is greater than a second Umrandungslänge 58 of the disc 10 side facing away 42 of the output element 36th

According to the laws of aerodynamics occurs in the arrangement described above by the occurring during a drive of the motor vehicle wind a positive pressure difference between an air pressure on the side facing away from the disc 10 42 of the output member 36 and an air pressure on the disc 10 facing side 40 of the output element 36, by means of which on the driven element 36 a substantially directed to the disc 10 output force 62 can be generated, which is forwarded via the support unit 32 and the cover unit 28 to the wiper strip 14 and speed-dependent, in an advantageous manner with increasing speed of the airstream disproportionately strongly increasing, an additional contact force 64 on the

Wiper strip 14 generates (Fig. 2), a lifting of the wiper strip 14 of the Disc 10, in particular at high speed of the motor vehicle, advantageously prevented.

Claims

claims

1 . Wiper blade for wiping discs (10), in particular of panes (10) of motor vehicles, having a main extension (12), a rubber-elastic wiper strip (14) which can be applied to the pane (10) to be wiped, and a carrying unit (22), wherein the Wiper strip (14) is held in an operative assembly state substantially parallel to the main extension (12) on the support unit (22), and with a cover unit (28) attached to the support unit (22) for covering at least part of an upper side (26). the support unit (22), characterized by at least one output element (36) for generating an operating state during a drive of the motor vehicle through a wind substantially to the disc (1) directed output force (62), wherein in the ready-installed state, the output element ( 36) at least in one in the Haupterstreckungsnchtung (12) contiguous portion (38) both on one of the disc (10) facing side (40) of the output element (36) and on one of the disc (10) remote from the side (42) of the output element (36) is flowed around by the wind.

2. Wiper blade according to claim 1, characterized in that the

Disc (10) facing side (40) of the at least one output element (36) in a direction to the Haupterstreckungsnchtung (12) perpendicular plane has a convex curvature.

3. Wiper blade according to claim 1 or 2, characterized in that the

Disc (10) facing away from (42) of the at least one output element (36) in a direction of the Haupterstreckungsnchtung (12) perpendicular plane has a concave curvature.

4. Wiper blade according to one of the preceding claims, characterized in that the disc (10) facing away from (42) of at least an output element (36) in the plane perpendicular to the main extension direction (12) has both a side part (44) with a convex curvature and a side part (46) with a concave curvature.

Wiper blade according to one of the preceding claims, characterized in that the side (40) of the at least one output element (36) facing the disc (10) has an exclusively convex curvature in the plane perpendicular to the main extension direction (12).

Wiper blade according to one of the preceding claims, characterized in that the disk (10) facing side (42) of the at least one output element (36) in the direction of the main extension direction (12) vertical plane has a border length (56) which is greater than one Border length (58) of the disc (10) facing away from (42) of the at least one output element (36) in this plane.

Wiper blade according to one of the preceding claims, characterized in that the driven element (36) and the cover unit (28) are arranged spaced from one another in the direction of the disc (10) in the ready-for-installation state.

Wiper blade according to one of the preceding claims, characterized by a support unit (32) arranged between the driven element (36) and the cover unit (28) and comprising at least two individual supports (34).

Wiper blade at least according to claim 7, characterized in that at least two of three elements from a group formed by the output member (36), the support unit (32) and the cover unit (28) are integrally formed.

Wiper blade according to one of the preceding claims, characterized in that the at least one output element (36) has a windward facing portion whose cross-sectional area in a plane which is perpendicular to the main extension direction (12), bounded by a circular section (48).

1 1. Wiper blade according to one of the preceding claims, characterized in that the at least one output element (36) has a section facing away from the airstream, the cross-sectional area in a plane which is perpendicular to the main extension direction (12), bounded by a circular section (50).

12. wiper blade at least according to claim 8 and 9, characterized in that a radius of the circular portion (48), which bounds the windward facing portion, is greater than a radius of the circular portion (50), which bounds the air stream facing away from the section.

13. wiper blade at least according to claim 1 1, characterized in that in an operative state of assembly, a circle center (52) of the circular section (48), which borders the windward facing section, the disc (10) is closer spaced than a circle center (54) the circle section (50) which borders the section facing away from the airstream.