JPH08104204A - Wiper device for vehicle - Google Patents

Abstract

PURPOSE: To enable only a single wiper arm to cope with all wiping patterns. CONSTITUTION: A rotation transmitting member 9 is linked over to a sprocket 10 fixedly provided in a pivot holder 8 and to a sprocket 11 provided turnably in a wiper blade mounting member 12. A wiper arm 7 is swiveled with its base end part serving as the turn center so as to rotate through the rotation transmitting member 9 the sprocket 11 provided in the wiper blade mounting member 12. Thus by the single wiper arm 7, an arbitrary wiping pattern can be obtained by a diametric ratio of both the sprockets 10, 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular wiper device which improves the visibility of a vehicle driver and can be applied to any wiping pattern.

[0002]

2. Description of the Related Art A windshield wiping pattern (a shape drawn by a wiper blade) varies depending on a vehicle model such as a bus or a general passenger car. As an example, in the wiping pattern shown in FIG. 11, the wiper blade stop lines 1 on both left and right sides are parallel to the vertical direction, and the upper and lower wiper blade movement lines 2 are parallel arcs. Is often used in. Further, the wiping pattern shown in FIG. 12 forms upper and lower wiper blade movement lines 2 with an arc drawn around an intersection P where the extension lines of the left and right wiper blade stop lines 1 intersect, and this wiping pattern is generally Mostly used in passenger cars.

The wiping pattern shown in FIG. 12 is obtained by attaching a wiper blade to the wiper arm having the intersection P as the center of rotation and rotating the wiper arm. The wiping pattern cannot be drawn by simply attaching the wiper blade to the wiper arm and rotating the wiper arm.

Therefore, as a wiper device for obtaining this specially shaped wiping pattern, for example, Japanese Utility Model Publication No. 58-1389 and Japanese Utility Model Publication No. 50-17139 disclose so-called pantograph type wiper devices. This wiper device will be described with reference to FIG. 13. The main wiper arm 3 is provided with the sub-arm 4 via the link mechanism 5, and the lengths of the link mechanism 5 and the sub-arm 4 are related to the rotation locus of the main wiper arm 3. The main wiper arm 3, the link mechanism 5 and the sub arm 4 are designed each time so that the portion (a) shown in FIG. 14 can be drawn by the wiper blade 6, for example.

[0005]

Since the conventional pantograph type wiper device is composed of a main wiper arm and a sub-arm, it is uncomfortable for the driver when the two arms swing. However, there is a problem that it takes a lot of time and cost because it obstructs the visibility of driving and it is necessary to design while repeating the prototype test of the main wiper arm, the link mechanism and the sub arm according to the wiping pattern. is there. Since the main wiper arm, the link mechanism and the sub arm form a wiping pattern in an organic relationship with each other, there is a problem that the main wiper arm cannot be diverted to another wiping pattern, for example.

The present invention provides a vehicle wiper device which can cope with any wiping pattern by using only the main wiper arm.

[0007]

Means for Solving the Problems According to the present invention for solving the above-mentioned problems, a sprocket is provided on a pivot holder at a base end portion of a wiper arm and a sprocket at a wiper blade mounting member at a tip end side of the wiper arm. A rotation transmission member is bridged over the sprocket, the sprocket provided on the pivot holder is fixed, and the sprocket provided on the wiper blade mounting member is rotatable.

[0008]

Since the present invention is constructed as described above, it has the following effects. That is, since the rotation transmission member is hung over the sprocket fixed to the pivot holder which is the base end portion of the wiper arm and the sprocket rotatably provided on the wiper blade mounting member which is the tip end side of the wiper arm, When the wiper arm is swung around the base end of the arm as the center of rotation, the sprocket provided on the wiper blade mounting member can be rotated via the rotation transmission member. The relationship between the swing angle of the wiper arm and the rotation angle of the sprocket provided on the wiper blade mounting member can be arbitrarily selected according to the diameter ratio of both sprockets.

[0009]

EXAMPLE An example of the present invention will be described below. In FIG. 1, a sprocket 10 is fixed to a pivot holder 8 at a base end portion of a wiper arm 7, and a wiper blade mounting member for mounting the wiper blade 6 is attached.
A sprocket 11 is rotatably provided on the shaft 12.
A rotation transmission member 9 is hung on the sprockets 10 and 11. The rotation transmitting member 9 is, for example, a chain, a belt or a wire rope.

FIG. 2 is a vertical sectional view taken along the line AA in FIG. 1, in which the sprocket 10 is fixed to a pivot holder 8 mounted on a vehicle body 14 with bolts 15. And
The base end of the wiper arm 7 is fastened by a nut (not shown) to the tip of the drive shaft 13 which is provided so as to penetrate the sprocket 10 and the pivot holder 8. As a result, even if the wiper arm 7 swings by the drive shaft 13, the sprocket 10 is in a fixed state without rotating.

FIG. 3 is a vertical sectional view taken along the line BB of FIG. 1, in which the sprocket 11 is fixed to a wiper blade mounting member 12 rotatably supported by the wiper arm 7, and the sprockets 10 and 11 are fixed. When the wiper arm 7 is swung while the rotation transmitting member 9 is hung on the sprocket 11, the rotative force is transmitted to the sprocket 11 and the wiper blade mounting member
12 rotates, and the wiper blade 6 attached to the wiper blade mounting member 12 is rotated.

That is, as shown in FIG. 4, the sprocket
When the wiper arm 7 is swung in the direction of arrow C1 while 10 is fixed, the rotation transmission member 9 moves in the direction of arrow E1 to rotate the sprocket 11 in the direction of arrow D1 and rotate the wiper blade 6. When the wiper arm 7 is swung in the direction of arrow C2, the rotation transmitting member 9 moves in the direction of arrow E2 to rotate the sprocket 11 in the direction of arrow D2.
Rotate the wiper blade 6.

5 to 10 are views showing the relationship between the diameter ratio of the sprockets 10 and 11 and the wiping pattern. As shown in FIG. 6, when the diameters of the sprockets 10 and 11 are made substantially equal to each other, when the wiper arm 7 swings from 7a to 7b, the wiper blade 6 rotates while keeping the vertical posture from 6a. Move to 6b. Wiper blade 6 at this time
5, the wiper blade stop line 1 becomes parallel to the vertical direction, and the wiper blade movement line 2 draws a parallel arc in relation to the trajectory X of the sprocket 11.

In FIG. 8, the diameter of the sprocket 10 is increased,
The movement state of the wiper blade 6 when the diameter of the sprocket 11 is reduced is shown. In this case, when the wiper arm 7 swings from 7a to 7b, the wiper blade 6 rotates and moves so as to fall from 6a to 6b. As shown in FIG. 7, the wiping pattern drawn by the wiper blade 6 at this time can set the wiper blade stop line 1 to a substantially horizontal position, widen the outer wiper blade movement line 2, and move the inner wiper blade movement line. A wiping pattern with a narrow line 2 can be obtained.

Next, FIG. 10 shows the movement state of the wiper blade 6 when the diameter of the sprocket 10 is reduced and the diameter of the sprocket 11 is increased. In this case, when the wiper arm 7 swings from 7a to 7b, the wiper blade 6 rotates and moves so as to gently fall from 6a to 6b. As shown in FIG. 9, the wiping pattern drawn by the wiper blade 6 at this time is such that the wiper blade stop line 1 has an inclination approximately in the middle of the case of FIG. 5 and FIG.
Draws an arc, while the inner wiper blade line 2
Can obtain a wiping pattern that is not an arc.

In the example shown in FIGS. 5 to 10, the sprockets 10 and 11 have the same diameter, the diameter of the sprocket 10 is larger than that of the sprocket 11, and vice versa. Diameter of sprocket
It shows a tendency of the wiping pattern by exemplifying a typical one when it is made smaller than the diameter of 11, and an appropriate wiping pattern can be obtained by arbitrarily determining the diameters of the sprockets 10 and 11. it can.

The operation of the present embodiment configured as described above will be described below. As shown in FIG. 1, a sprocket 10 fixed to a pivot holder 8 and a sprocket rotatably provided on a wiper blade mounting member 12 are spanned by a rotation transmission member 9, and a drive shaft 13 is used as a rotation center. A sprocket provided on the wiper blade mounting member 12 via the rotation transmitting member 9 by swinging the arm 7.
11 can be rotated. The relationship between the swing angle of the wiper arm 7 and the rotation angle of the sprocket 11 provided on the wiper blade mounting member 12 can be arbitrarily selected depending on the diameter ratio of the sprockets 10 and 11.

As described above, the rotation angle of the sprocket 11 with respect to the swing angle of the wiper arm 7 can be arbitrarily selected according to the diameter ratio of the sprockets 10 and 11, so that the wiper blade 6 attached to the wiper blade attaching member 12 is drawn. Any wiping pattern can be obtained. Also, the length of the wiper arm 7 can be shortened by selecting the diameter ratio of the sprockets 10 and 11.

Although the above description has been made based on the diameter ratio of the sprockets 10 and 11, when a chain is used for the rotation transmitting member 9, an arbitrary wiping pattern is obtained based on the gear ratio.

[0020]

As described in detail above, according to the present invention, the sprocket fixed to the pivot holder and the sprocket rotatably provided on the wiper blade mounting member are spanned by the rotation transmission member to form the wiper arm. Since the sprocket provided on the wiper blade mounting member is rotated via the rotation transmission member by swinging the wiper arm around the base end as the center of rotation, the diameter ratio of both sprockets can be adjusted by one wiper arm. As a result, an arbitrary wiping pattern can be obtained, the visibility is improved, the design of the wiping pattern is simplified, and since only the sprocket needs to be replaced, the wiper arm can be used for various vehicles.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view taken along line AA of FIG.

FIG. 3 is a vertical sectional view taken along line BB of FIG.

FIG. 4 is a schematic diagram of FIG. 1.

FIG. 5 is a view showing a wiping pattern when the sprockets have the same diameter.

FIG. 6 is a schematic view of a wiper device corresponding to FIG.

FIG. 7 is a diagram showing a wiping pattern when the diameter of the sprocket on the pivot holder side is increased.

8 is a schematic diagram of a wiper device corresponding to FIG. 7. FIG.

FIG. 9 is a diagram showing a wiping pattern when the diameter of the sprocket on the pivot holder side is reduced.

FIG. 10 is a schematic view of a wiper device corresponding to FIG.

FIG. 11 is a diagram showing an example of a wiping pattern.

FIG. 12 is a diagram showing an example of a wiping pattern.

FIG. 13 is a schematic view of a conventional wiper device.

FIG. 14 is an explanatory diagram showing a relationship between a wiping pattern having a special shape and a wiper device.

[Description of sign]

 6 Wiper blade 7 Wiper arm 8 Pivot holder 9 Rotation transmission member 10 Sprocket 11 Sprocket 12 Wiper blade mounting member

Claims (1)

[Claims] 1. A sprocket is provided on a pivot holder at a base end portion of a wiper arm and a wiper blade attachment member on a tip side of the wiper arm, and a rotation transmission member is hung over the sprocket to fix the sprocket provided on the pivot holder. At the same time, a sprocket provided on the wiper blade mounting member is made rotatable, and a wiper device for a vehicle is provided.