JP2987680B2 - Wiper drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper driving device for a vehicle, and more particularly to an error angle correction device provided on a wiper shaft to which a wiper arm is connected.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 5-51496 discloses an apparatus for controlling an error angle, that is, an angle between a wiper blade and a windshield to a desired range in the entire operation range of a wiper arm. Equipped with a drive device for obtaining the angle and a drive device for swinging the wiper shaft so as to correct the error angle, and has a separate drive device and a bearing, so that the structure is complicated and the device becomes large. have.

[0003] Japanese Utility Model Publication No. 1-16822 similarly shows an error angle correction device, and has the same drawbacks as those described above.

Japanese Unexamined Utility Model Publication No. 63-189857 similarly shows an error angle correction device.
Since it uses an individual unit and a link device, it becomes large, and it is difficult to attach it to a vehicle.

[0005]

In these prior art systems, in addition to the above-mentioned drawbacks, it is not possible to effectively correct the error angle in accordance with the bending state of the windshield depending on the vehicle type. Cannot be performed flexibly, and the tilt angle due to the rotation of the pivot shaft cannot be increased, so that it is difficult to correct an appropriate error angle with respect to a strongly bent windshield, and a wiping operation is performed. Separate drives are required for the rotation of the pivot shaft and the oscillating motion for correcting the error angle, which makes the whole device complicated and large, prone to failures, and may be damaged or damaged. Is big.

SUMMARY OF THE INVENTION An object of the present invention is to provide a new error angle correction device that solves the above-mentioned problems in the prior art.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a wiper driving device for rotating a curved body fixedly connected to a wiper shaft along another curved body.
The curved body fixedly connected to the wiper shaft
Body or cone, and the contact surface of both curved bodies is a gear,
Error angle made with toothed surfaces such as
And a wiper driving device capable of correcting the above.

[0008] Preferably, the surfaces of the two
Means for increasing the surface pressure are provided. Discs or cones are circles
It may have a cross section other than the shape.

[0009]

According to the present invention, the blade rubber can be held substantially perpendicular to the glass surface over the entire surface of the wiping surface where the wiper blade wipes the glass surface of the automobile.

Generally, the glass surface of an automobile has a convex surface facing outward, so that the arm pressure increases near the center of the wiping angle range of the wiping surface. According to the device of the present invention, the arm holding angle can be made substantially uniform over the entire wiping angle.

[0011]

An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 7 is a cross-sectional view of a normal wiper shaft. A wiper arm (arm head) (not shown) is fixed to an upper end of a shaft 1 rotatably supported by a bearing unit 2 fixed to a vehicle body. The link arm 3 is fixed, and the link arm 3 is provided with a link pin 4 and connected to a wiper motor via a link (not shown) so that the shaft 1 reciprocally swings. In such a conventional technique, the swing angle of the wiper arm is constant, and it is not possible to appropriately wipe a curved glass or the like.

FIG. 1 is a top view and a sectional side view of a wiper driving device shown as a first embodiment of the present invention. The wiper shaft 11 connected to the wiper arm is swingably rotatable by the link arm 31 and is supported at an angle to the rotation axis of the link arm 31.
Is provided with a link pin 4 and is connected to a wiper motor via a link (not shown) so that the link arm 31 swings reciprocally. The link arm 31 is rotatably supported by a shaft 21 attached to a fixed part 20 fixed to a vehicle body or the like. A helical gear 12 is fixed to the wiper shaft 11, and the helical gear 12 meshes with a helical gear 22 fixed to the fixing portion 20.

With the rotation of the link arm 31, the wiper shaft 11 is rotated around the axis of the shaft 21 by being limited by the meshing of the bevel gears 12 and 22 and the inclination angle between the wiper shaft 11 and the link arm 31. While rotating reciprocally, it rotates reciprocally around the axis of the wiper shaft 11.

FIG. 2 shows another embodiment, in which the link arm 32 swings around a swing shaft 24 below the fixing portion 23, and the wiper shaft 13 is fixed to a bearing 33 of the link arm 32. The oscillating shaft 24, supported by the spherical bearing 25 of the portion 23 and limited to the meshing of the bevel gears 14, 26, reciprocates around an axis defined by the spherical bearing 25 and reciprocates the wiper shaft 13. It reciprocates around an axis.

FIG. 3 shows a modification of FIG.
4 is provided between the wiper shaft 13 and the link arm 32 to absorb play in the meshing of the bevel gears 14 and 26. This embodiment is particularly suitable when the bevel gears 14, 26 are frustoconical rings that are in frictional contact with each other, rather than gears.

FIG. 6 , in particular, FIG . 6A is a graph showing the error angle corrected by the embodiment of FIG. 1 in comparison with the conventional one, that is, without the error angle correction device . b) Wiping of the horizontal axis in FIG. 6 (a)
The angle, ie, the operating range of the wiper,
FIG. 6C is an explanatory view together with a front view, and FIG.
FIG. 4A is an explanatory diagram showing plus and minus signs of the vertical axis.
is there. In this embodiment, it can be seen that the error angle is maintained within ± 2 degrees over most of the operating range.

FIG. 5 shows an operation diagram of the embodiment of FIG.
5 (a), 5 (b), 5 (c), and 5 (d) show the states shown in FIGS. 5 (e), 5 (f), 5 (g) and 5 (h), respectively. When there is a relative position of the helical gears 12 and 22 (the operation angles of the wiper arm 5 (partially shown) connected to the wiper shaft 11, that is, the wiping angles are 10, 30, 50, and 70 degrees, respectively). FIG. 3 is a diagram illustrating the falling angle of the wiper shaft 11 when viewed from the arrow direction in each drawing. As can be seen from the figure, it is possible to keep the blade rubber substantially perpendicular to the glass surface to be wiped at each rotation angle.

FIG. 6 is a graph showing the error angle corrected by the embodiment of FIG. 1 in comparison with the conventional one, that is, without the error angle correction device, and in this embodiment, most of the range within the operating range is shown. It can be seen that the error angle is kept within ± 2 degrees in the region of.

[0019]

As described above, according to the present invention, the wiper blade can hold the blade rubber substantially perpendicular to the glass surface over the entire surface of the wiping surface for wiping the glass surface of the automobile.

In general, since the glass surface of an automobile has a convex surface facing outward, the arm pressure increases near the center of the wiping angle range of the wiping surface. According to the device of the present invention, the arm holding angle can be made substantially uniform over the entire wiping angle.

The above-described embodiment does not limit the present invention, and various modifications can be made. For example, the helical gear is shown as a curved body, but may have surfaces that frictionally contact each other as described above, or may be a contact surface, for example, a cam having a cam surface only in an operation range. .

Although the above description has been made with reference to a normal outwardly convex glass surface, the outwardly concave glass surface can be easily changed simply by changing the mounting position. The arm holding angle can be made substantially uniform over the entire wiping angle.

[Brief description of the drawings]

FIG. 1 is a top view showing a main part of a wiper driving device in which a wiper shaft and a curved body fixedly connected thereto rotate in contact with another curved body according to an embodiment of the present invention; It is a figure and a sectional side view.

FIG. 2 is a top view and a cross-sectional side view showing another embodiment.

FIG. 3 is a top view and a sectional side view showing a modification of FIG. 2;

FIG. 4 is a sectional side view showing a modification of FIG. 1;

FIG. 5 shows an operation diagram of the embodiment of FIG. 1;
(E), FIGS. 5 (f), 5 (g), and 5 (h) are schematic diagrams corresponding to FIGS. 5 (a), 5 (b), 5 (c), and 5 (d), respectively. Top view.

Figure 6, in particular FIGS. 6 (a) is a graph showing an error angle which is examples correction of the prior art and FIG. 1, the horizontal axis in FIG. 6 (b), FIGS. 6 (a) FIG. 6C is a schematic view showing the wiping angle of the wiper , that is, the operating range of the wiper, and FIG .
The schematic diagram which shows the sign of the error angle of (a) .

FIG. 7 is a sectional side view showing a main part of a conventional wiper driving device.

[Explanation of symbols]

 1, 11, 13 Wiper shaft 2, 20, Fixed part 3, 31, 32 Link arm 12, 22 Bevel gear 14, 26 Bevel gear 21, 24 Swing axis of link 25 Swing support part of wiper shaft 34 Spring 35, 36 Spring

Continuation of front page (56) References JP-A-4-87863 (JP, A) JP-A-4-193650 (JP, A) JP-A-3-86655 (JP, A) , U) Japanese Utility Model Application Hei 4-31653 (JP, U) Japanese Utility Model Application No. 2-73693 (Japanese Utility Model Application Hei 4-31653) (58) Field surveyed (Int.Cl. ⁶ , DB name) B60S 1/34

Claims (2)

(57) [Claims] 1. A curved body fixedly connected to a wiper shaft is contact-rotated along another curved body .
A wiper drive, fixedly connected to the wiper shaft;
The connected curved body is a disc or a cone, and both curved bodies
The contact surface is a toothed surface such as gears and serrations
Wiper drive device that can correct the error angle . 2. The wiper driving device according to claim 1, further comprising means for increasing the surface pressure of the surfaces of the two curved surfaces that contact each other.
A wiper driving device characterized by being provided .