WO2005080160A1

WO2005080160A1 - Wiper device

Info

Publication number: WO2005080160A1
Application number: PCT/EP2004/053483
Authority: WO
Inventors: Joachim Zimmer
Original assignee: Robert Bosch Gmbh
Priority date: 2004-02-10
Filing date: 2004-12-15
Publication date: 2005-09-01
Also published as: DE102004006341A1; EP1716027A1

Abstract

The invention relates to a wiper device (1) for wiping a windscreen (5) of a motor vehicle, comprising a wiper arm (2) and a wiper blade (3) fixed to the wiper arm (2), wherein the shape of the wiper blade (3) is such that it is pressed against the windscreen (5) as a result of the oncoming driving wind, wherein the wiper arm (2) is arranged laterally on the side of the wiper blade (3) facing away from the flow, such that the oncoming driving wind can hit the wiper blade (3) in an unimpeded manner.

Description

wiper device

The invention relates to a wiper device, in particular a wiper device for wiping a windshield of a motor vehicle, in particular with an aero wiper blade.

Wiper blades for wiper devices for use in motor vehicles are increasingly designed in such a way that they are pressed onto the windshield by the wind. For this purpose, the wiper blades are provided with a profile, which causes the wind to apply pressure to the windshield. The contact pressure is decisively determined by the flow around the wiper arm and the wiper blade.

In particular, the high-speed quality is the focus of these wiper devices. Good high-speed quality is only achieved if the wiper blade and / or the wiper arm are cleanly blown against.

At the same time, the wind noise should be as low as possible, which can only be achieved with a particularly flat design.

In the known wiper devices, the wiper arm is located laterally in the direction of flow of the wind in front of the wiper blade or above the wiper blade, so that the wiper blade cannot either be flowed undisturbed by the wind or the height is so great that wind noise occurs.

In addition, the field of vision of a vehicle occupant is disturbed when the wiper arm is arranged above the wiper blade.

It is an object of the present invention to provide a wiper device with which a large contact pressure can be achieved and the field of vision of a vehicle occupant is not impaired. This object is achieved by the wiper device according to claim 1.

Further advantageous embodiments of the invention are specified in the dependent claims.

According to the invention, a wiper device is provided for wiping a windshield of a motor vehicle. The wiper device has a wiper arm and a wiper blade attached to the wiper arm. The shape of the wiper blade is designed in such a way that it is pressed onto the windshield by the driving wind flowing in when the motor vehicle is traveling. The wiper arm is arranged laterally on the side of the wiper blade facing away from the flow, so that the inflowing airstream hits the wiper blade without interference. In this way it is achieved that the flow against the wiper blade is essentially undisturbed by the arrangement of the wiper arm, the overall height of the wiper device also being reduced in such a way that the wind noise is as low as possible. The low height still allows an undisturbed field of vision for the vehicle occupants.

It is preferably provided that the wiper blade and the wiper arm are one with respect to the plane of the windshield

Have the top edge. The wiper arm is designed in such a way that, in a parked position of the wiper arm, the upper edge of the wiper arm is arranged at the same height or below the upper edge of the wiper blade with respect to a line of sight, the line of sight being visible at all points of the eye due to the visibility of the wiper device by an occupant Inmates is determined.

In this way, despite the provision of the wiper arm on the side of the wiper blade facing away from the flow, it is avoided that the wiper arm arranged on the side disturbs the field of vision of the vehicle occupant. Due to the lateral arrangement of the Wiper arms with an upper edge at the same height or below the upper edge of the wiper blade can reduce or avoid a possible impairment of the field of vision of the vehicle occupant.

The possible eye points are preferably defined by an eye ellipse, which is determined by the areas of the possible seating positions of the body sizes of a vehicle occupant.

In particular, the line of sight can be determined by a lower edge of the windshield and / or by a lower edge of the transparent area of the windshield.

Preferred embodiments of the invention are explained in more detail below with reference to the accompanying drawings. Show it:

FIG. 1 shows a wiper device according to the invention;

FIG. 2a shows a flow pattern in a wiper device according to the prior art, in which the wiper arm is arranged on the side of a wiper blade facing the flow;

FIG. 2b shows a flow profile in a wiper device according to the present invention;

FIG. 3 shows an illustration of the eye ellipse with an illustration of two extreme lines of sight; Figure 4a to 4c possible shapes of the wiper arm and arrangement on the wiper blade; and

Figure 5a and 5b arrangement of the wiper device according to the invention on a windshield with a darkened area.

1 shows a wiper device _L for wiping a windshield 5 in the direction of arrow W. The wi- The shaving device 1 has a wiper arm 2 and a wiper blade 3. The wiper blade 3 is connected to the wiper arm 2 via a holding device 4 in order to hold the wiper blade 3 by the wiper arm 2 in such a way that it cannot be pivoted in the wiping direction. The wiper device 1 is connected to a drive (not shown), so that the wiper device 1 is pivoted essentially parallel to the surface of the windshield 5 in such a way that it is wiped when a wiper edge 4 of the wiper blade 3 lies on it.

The windshield 5 is inclined with respect to the direction of travel of the motor vehicle, so that when the vehicle is moved, the wind is directed in a direction parallel to the surface of the windshield 5 and the wiper blade 3, which is essentially perpendicular to the windshield 5, flows against the side.

In conventional wiper devices, the wiper arm 2 is located in front of the wiper blade 3 or above the wiper blade 3, as a result of which there are disadvantages when the wiper blade 3 flows against the wind or a disadvantageous noise development.

FIG. 2a shows a flow diagram of a wiper blade 3 with a wiper arm 2 arranged upstream. Under unfavorable circumstances, the wiper arm 2, due to the undisturbed inflow by the wind, causes a lift, so that the contact pressure of the wiper device 1 on the windshield is reduced. In any case, the wiper arm 2 shields at least a part of the wiper blade 3 from the airstream, and turbulence occurs on the side of the wiper arm facing away from the wind, which can cause the wiper device 1 to vibrate or rattle.

FIG. 2b shows a flow pattern for a wiper device according to the invention. You can see that the on the Wiper arm 2 arranged away from the flow of the wiper blade 3 does not influence the flow against the wiper blade 3 by the airstream.

In Figure 3, the position of a vehicle occupant 10 is. the windshield 2 shown. The field of vision of the vehicle occupant results from a lower edge 11 and an upper edge 12 of the windshield 5. An eye ellipse 13 indicates all possible eye positions of the vehicle occupant 11, which can be assumed in a seated position with different body sizes and different seat settings. The wiper device 1 is preferably arranged in a parking position such that it is below a line of sight S, which results from the lower edge 11 of the windshield 2 and an extreme eye position. Instead of the lower edge of the windshield, the wiper device 1 can also be hidden behind a tinted section of the windshield 2 or an opaque section with respect to the line of sight S. The definition of the line of sight essentially depends on the eye ellipse 13, which are defined by the standards ECE, SAE and ADR.

FIGS. 4a to 4c show different shapes of the wiper arm and their arrangement on the wiper blade. For reasons of stability and the pressing force that the wiper arm exerts on the wiper blade in order to hold the wiper blade on the windshield 2, the wiper arm 2 should have a reinforcing profile, for. B. a U-profile. FIG. 4 a shows that the base of the U-profile runs essentially parallel to the line of sight S and in a line with the upper edge of the wiper blade 3, which is defined with respect to the windshield 5. The legs of the U-shaped profile are formed perpendicular to the surface of the windshield. FIG. 4b shows a substantially non-adapted U-profile of the wiper arm 2, the wiper arm 2 in this case being offset in the direction of the windshield 5 with respect to the wiper blade 3 is to remain below the line of sight S shown in dashed lines. 4c shows a further embodiment, in which the wiper arm 2 with a U-shaped profile is arranged essentially obliquely on the side of the wiper blade 3 facing away from the flow, so that the upper edge of the wiper blade 3 and the upper edge of the wiper arm 2 are on or below the Line of sight S is.

Essentially, the cross section and the position of the wiper arm 2 are determined in such a way that the most unfavorable viewing beam S is taken into account. The inclination of the upper wiper arm line runs essentially parallel to the line of sight and is arranged lower than the top edge of the wiper blade in relation to the line of sight.

At the same time, it is taken into account that the wiper arm 2 is always in the slipstream. In particular, it should be provided that the wiper arm 2 lies in the slipstream over the entire working area when wiping. The stroke angle and the relative movements between the wiper arm and the wiper blade 3 should be taken into account. This ensures firstly that there is an optimal and undisturbed flow for the wiper blade 3 and secondly that no buoyancy forces are generated on the wiper arm 2. The flat construction of such a wiper device also ensures that there are no disturbing wind noises.

FIG. 5 a shows that the wiper device 1, even when the wiper arm 2 is arranged on the side facing away from the wind flow, is in the passenger's field of vision if the tinting or darkening at the lower edge of the windshield 5 is too low or the wiper device 1 is not deep disappears enough under the lower edge of the windshield 5 in a parking position. FIG. 5b shows that the wiper device 1 is preferably positioned on the windshield in such a way that it passes through the lower edge of the transparent windshield certain line of sight runs on or above the upper edges of wiper blade 3 and wiper arm 2. In this way it can be achieved that no disturbing impairment of the field of vision of the vehicle occupant is caused in the parking position.

Claims

claims

1. Wiper device (1) for wiping a windshield (5) of a motor vehicle with a wiper arm (2) and a wiper blade (3) fastened to the wiper arm (2), the shape of the wiper blade (3) being designed such that it is formed by the driving wind flowing in when the motor vehicle is moving is pressed onto the windshield (5), characterized in that the wiper arm (2) is arranged laterally on the side of the wiper blade (3) facing away from the flow, so that the incoming wind blows onto the wiper blade (3) without interference. meets.

2. Wiper device (1) according to claim 2, characterized in that the wiper blade (3) and the wiper arm (2) have an upper edge with respect to the plane of the windshield (5), the wiper arm (2) being designed in such a way that In the parked position, the upper edge of the wiper arm (2) is arranged at the same height or below the upper edge of the wiper blade (3) with respect to a line of sight, the line of sight being visible through an occupant's visibility of the wiper device (1) by an occupant at all possible points of the eye during the journey Inmates is determined.

3. Wiper device (1) according to claim 2, characterized in that the possible eye points is defined by an eye lip <13), which is determined by the areas of the possible sitting positions, the body sizes. Wiper device (1) according to claim 2 or 3, characterized in that the line of sight is determined by a lower edge of the windshield (5) and / or by a lower edge of the transparent area of the windshield (5).