JPH0374242A - Wiper blade for vehicle - Google Patents

Abstract

PURPOSE:To make uniform contact between a wiper blade and a glass surface having large curvature in a wiper blade having plural yokes by providing tension springs which act on both yokes at hinged joints connecting plural yokes with each other. CONSTITUTION:A wiper is composed of a first yoke 1 connected to a wiper arm, second yokes 2, 3 hinged to the first yoke 1 and, third yokes 4, 5 hinged to the second yokes 2, 3. A blade rubber supporting portion 10 is connected to these yokes at six points as shown in the figure. A tension spring 7 is arranged between the second yoke 2 and the third yoke 4. Similarly, tension springs are arranged at connecting parts of the respective yokes. By this constitution, the wiper blade can follow a change of a curvature of the glass surface, and can make uniform contact with the glass surface.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a wiper device for a vehicle, and more particularly to a wiper blade for a vehicle of the type that includes a plurality of yokes that are hinged to each other.

<Prior Art> As mentioned above, a typical wiper blade for a vehicle includes a plurality of yokes that are hinged to each other, and the number of yokes varies, such as 2, 3, 4, 5, 6, etc. things are widely used. Increasing the number of yokes increases the number of connection points between the yoke and the blade lever support part that supports the blade rubber, and it is possible to make the load distribution in the length direction of the blade rubber even. The number of yokes and hinge joints increases, making the structure complex and increasing cost.

<Problems to be Solved by the Invention> This prior art has the following problems. In other words, the windshield of a vehicle, especially a passenger car, has a large radius of curvature in the center and a small radius of curvature on both sides, which results in a uniform load distribution along the length of the wiper blade. It is not possible to contact a glass surface with a uniform load distribution with such a locally curved glass surface.

An object of the present invention is to provide a wiper blade for a vehicle that solves these problems.

Means for Solving the Problems According to the present invention, the yokes include a plurality of yokes that are hinged to each other, and the yokes are connected to each other at at least one location of the yoke connecting portion that connects the yokes to each other. A wiper blade for a vehicle is provided which is provided with a tension spring member that acts on the windshield.

According to one aspect of the present invention, a yoke is included that has different distances from the main hinge portion to both ends.

According to another aspect of the invention, the load point received from the wiper arm is located closer to the tip than the center of the length of the wiper blade.

Function> By providing a tension spring member that acts between both yokes that are connected to each other at the yoke joint that connects the yokes to each other, the load distribution in the length direction of the blade rubber can be determined arbitrarily, and the wiper boot 3 6 and a tension spring 7 acting according to the invention between the two yokes 2.4. The third yoke 4 is connected to the blade rubber support 10 at position 8.9 to transmit the load.

Although not shown in Figs. They are provided at the joints between the second yoke 3 and the third yoke 5, respectively. Note that FIGS. 1 and 3 show the blade rapal in a straight state, and FIGS. 2 and 4 show it in its free state, that is, when it is under the force of the tension spring 7 and does not move in the bending direction. It shows the maximum target condition that is limited by the configuration, structure, etc. of the yoke assembly.

Comparing FIG. 3 with FIG. 4, the distance between the hinge pin 6 and the center line of the tension spring 7 increases from A1 to A2.

The load acting on location 8 increases as this distance increases. Therefore, even if the radius of curvature of the glass surface to be cleaned becomes small, the blade rubber can sufficiently follow the change in the radius of curvature.

The curvature in the working range of the blade can be sufficiently adapted to glass surfaces that differ significantly in the length direction of the wiper blade.

Furthermore, by making the distance from the hinge part of the yoke to both ends different, and making the length of the wiper blade longer toward the end than the center position, the wiper blade can have a sufficiently large bend without increasing the overall height of the blade. You can get a blade.

<Embodiment> FIGS. 1 and 2 are side views of a wiper blade for a vehicle according to the present invention, and FIGS. 3 and 4 are respective partial sectional views. In the figure, the yokes include a first yoke 1 connected to a wiper arm (not shown), a second yoke 2.3 hinged to the first yoke 1, and a third yoke hinged to the second yoke 2.3. 4.5
The blade rubber support part 10 is connected to the yoke at six positions as shown in the figure.

No. 3 is a partial view of FIG. 1, and shows the second yoke 2, the third yoke 4, and the hinge pin 4 between both yokes 2.4. It is suitable for cases where the radius of curvature of the glass surface is small at a position close to the surface of the glass.Furthermore, compared to other types of springs, such as torsion springs, it increases the load when the bending is large and reduces the load. It can be prevented.

FIG. 5 is a front view of an automobile windshield, showing the operating ranges of the two wipers and a range 11 (indicated by hatching) where cleaning is poor due to bending of the glass surface. FIG. 6 shows a horizontal sectional view of the glass of FIG.

7 and 8 show conventional wiper blades.

Comparing FIG. 8 with FIG. 2, the conventional type cannot take a large bend, and therefore cannot follow the small radius of curvature of the glass surface, resulting in residual wiping.

FIGS. 9 and 10 show wiper blades according to the prior art in which the maximum focus state is similar to that shown in FIG. 2. If we compare Figure 9 with Figure 1, the height of Figure 9 is significantly higher. This significantly deteriorates visibility when not in use, and is also undesirable from a design standpoint. According to the present invention, the height of the wiper plate can be reduced, good visibility can be maintained, and the present invention is also suitable for a fully concealed type wiper device.

Comparing FIG. 1 with FIGS. 7 and 9, it can be seen that in the case of the present invention, the load transmission position 8.9 from the third yoke 4 is not equidistant from the hinge pin 6, but is located at the length of the wiper blade. In contrast, in the prior art shown in FIGS. 7 and 9, the third yoke 4'
, 4" to load transmission positions 8', 8"', 9', 9"
are equidistant from the hinge pins 6', 6''. According to the invention, the overlap of the yoke can be made small, thereby reducing the lift created by the airflow entering between the overlap. , and the high-speed characteristics can be significantly improved.

<Effects of the Invention> According to the present invention, a side view of the wiper blade shown in FIG. 1 in a free state, and a side view of the wiper blade shown in FIG. 1 is an enlarged partial sectional view of FIG. 1, FIG. 4 is a partial enlarged sectional view of FIG. Horizontal cross section of glass, No. 7
8 is a side view showing the wiper blade of FIG. 7 in a free state, FIG. 9 is a side view showing a modified example of the conventional wiper blade, and FIG. 10 is a side view showing the wiper blade of FIG. 9 in a free state; FIG.

l: 2nd yoke 2.3: 2nd yoke 4.5: 3rd yoke 7: Tension spring 6: Yoke joint (hinge pin)

Claims (1)

[Claims] 1. Includes a plurality of yokes that are hinged to each other,
A wiper blade for a vehicle, characterized in that a tension spring member acting between both yokes coupled to each other is provided at at least one location of a yoke coupling portion that couples the yokes to each other. 2. The vehicle wiper blade according to claim 1, further comprising a yoke having different distances from the hinge portion to both ends. 3. The vehicle wiper blade according to claim 1 or 2, wherein the load point received from the wiper arm is located on the tip side of the wiper blade from the center position of the length of the wiper blade.