JP2001071871A - Wiper device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper device for an automobile with a simple structure allowing evacuation and movement of a base end part of a wiper arm downward by a sufficient distance while securing a support rigidity of the wiper arm when an impact load acts on the device from above. SOLUTION: In this wiper device, a base end part 16a of a wiper arm 16 is fixed to the upper end of a pivot shaft 15 rotatably supported by a pivot holder 11, the pivot shaft 15 is projected upward by an adequate distance A from the upper end of the pivot holder 11, the pivot holder 11 is fixed to a plate 8 provided in a front cowl part 1 in the longitudinal direction, at least one of a front part and a rear part of an installation part 9 of the plate 8 for the pivot holder 11 is formed with an extension part 20 extending by an adequate distance B when a load above a prescribed load is applied. Thereby, when the load above the prescribed load acts, the base end part 16a can evacuate and move downward by a distance A+B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper device for an automobile for wiping foreign matters such as rainwater, snow and dust adhering to the surface of a windshield of the automobile.

[0002]

2. Description of the Related Art As shown in FIG. 4A, a wiper device for an automobile has a wiper arm 31 having a wiper blade attached thereto.
Is fixed to the upper end of a pivot shaft 33 rotatably supported by a pivot holder 32, and the pivot shaft 33 is reciprocated by a link member 34 disposed at the lower end of the pivot holder 32. The wiper arm 31 is configured to swing. Further, in the example of FIG. 4A, the pivot shaft 33 is configured to extend upward from the upper end of the pivot holder 32 and to be able to move in and out in the axial direction, so that the pivot shaft 33 extends upward on the base end 31 a of the wiper arm 31. When an impact load acts on the base end 3 of the wiper arm 31
The pivot shaft 33 is retracted downward by the distance C until 1a comes into contact with the upper end of the pivot holder 32, so as to reduce damage to the impact load and the wiper device.

In Japanese Patent Application Laid-Open Nos. 11-34808 and 11-48917, a pivot shaft is rotatably supported by a pivot holder attached to a vehicle body panel, and a load is applied from above. There has been proposed a structure in which a pivot holder is sometimes configured to be movable inward of a vehicle body to achieve a similar effect.

[0004]

However, FIG. 4 (a)
In the configuration of the wiper device shown in FIG. 1, since the pivot shaft 33 extends long from the upper end of the pivot holder 32, there is a problem that the rigidity of the support of the wiper arm 31 is reduced and the basic performance of the wiper device is deteriorated. Was.

In the structure disclosed in the above publication, the pivot holder moves to the inside of the vehicle body when an impact load is applied. Therefore, such a problem does not occur. However, the structure of the wiper device is complicated and the cost is reduced. There is a problem of getting high.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention allows the base end of the wiper arm to be retracted a sufficient distance downward when an impact load is applied from above while securing the support rigidity of the wiper arm. It is another object of the present invention to provide a vehicle wiper device having a simple configuration.

[0007]

According to the present invention, there is provided a wiper device for an automobile, wherein a base end of a wiper arm is fixed to an upper end of a pivot shaft rotatably supported by a pivot holder, and the pivot shaft is connected to an upper end of the pivot holder. In a wiper device for an automobile that protrudes upward by an appropriate length from the above, a pivot holder is attached to a plate that is laid forward and backward on the front cowl part,
At least one of a front portion and a rear portion of the pivot holder mounting portion of the plate is provided with an extension portion that extends when a predetermined load or more is applied.

According to such a configuration, when an impact load is applied to the base end of the wiper arm from above, the pivot shaft moves in and out by the distance between the base end of the wiper arm and the upper end of the pivot holder. By moving the pivot holder by the extension amount of the extension portion of the plate, the base end of the wiper arm can be retracted downward by the sum thereof, and the amount of protrusion of the pivot shaft from the upper end of the pivot holder is small. As a result, the rigidity of the support of the wiper arm can be ensured, and the height of the pivot holder fixing part of the plate can be increased because the amount of protrusion of the pivot shaft is shorter than in the conventional example. The height of the part can be reduced, and the cost can be reduced due to the simple structure of simply providing an extension on the plate. It is possible.

Further, if means is provided for reducing the bending rigidity of the plate on the side where the extension is not provided, of the front part and the rear part of the mounting part of the pivot holder of the plate, the rigidity on the side where the extension is not provided is provided. Thus, it is possible to prevent the stretching action of the stretching portion from being restricted, and the above action can be obtained smoothly.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle wiper device according to an embodiment of the present invention; FIG.

In FIG. 1, reference numeral 1 denotes a front cowl portion of a vehicle body, which is formed by connecting flanges 2a and 3a, 2b and 3b formed with a cowl outer 2 and a cowl inner 3 formed at front and rear edges thereof.
Are joined to form a box cross section. The lower end of the windshield 4 is joined to the rear upper surface of the cowl outer 2, and the opening 2 c is located at the front of the windshield 4 and extends intermittently in the vehicle width direction.
Are formed. The upper part of the opening 2c is covered with a cowl garnish 5. The rear end of the cowl garnish 5 is superimposed on the lower end of the windshield 4, a sealing material 6 is attached to the front end, and the rear end of the hood 7 is superimposed via the sealing material 6.

The front and rear joining flanges 2a, 3a and 2a are located at positions where the wiper device 10 is disposed in the front cowl portion 1.
A plate 8 for mounting the wiper device 10 is installed between b and 3b. A mounting portion 9 for mounting a pivot holder 11 of the wiper device 10 is formed at an intermediate portion of the plate 8 so as to be substantially parallel to the windshield 4 and corresponding to the opening 2c.
An insertion hole 9a for inserting the cylindrical support portion 12 is formed.

The pivot holder 11 has a mounting flange 13 projecting from the outer periphery of the cylindrical support portion 12. The cylindrical support portion 12 is inserted through the insertion hole 9a from below to mount the mounting flange 1.
The pivot holder 11 is mounted on the mounting portion 9 by applying 3 to the lower surface of the mounting portion 9 and fastening the bolts and nuts 14 through the mounting flange 13 and a plurality of mounting holes formed in the mounting portion 9. .

The cylindrical support 12 rotatably supports the pivot shaft 15. The upper portion of the pivot shaft 15 protrudes from the upper end of the cylindrical support portion 12 by an appropriate length, and the base end portion 16a of the wiper arm 16 is fixed to the upper end. An appropriate distance A is set between the upper end of the cylindrical support 12 and the base end 16a of the wiper arm. Further, the lower end of the pivot shaft 15 projects from the lower end of the cylindrical support portion 12 so that the link member 1
The pivot member 15 is reciprocated by the reciprocating swing of the link member 17 to swing the wiper arm 16. Reference numeral 18 denotes a rubber or resin waterproof boot that covers the outer periphery of the pivot shaft 15 protruding above the cylindrical support portion 12.

A portion of the plate 8 rising from the mounting portion 9 at a position substantially in front of the axis of the pivot shaft 15 in a direction substantially parallel to the axis of the plate 8 is a bent ridge extending in the vehicle width direction (hereinafter referred to as a bead).
An extension portion 20 is formed to extend when an excessive load is applied to the mounting portion 9 of the plate 8 from above by the bead 21. Due to the extension of the extension section 20, the cylindrical support section 12 is retracted downward by an appropriate distance B.

According to the above configuration, when an impact load is applied to the base end 16a of the wiper arm 16 from above,
As shown in FIG. 4B, the proximal end 1 of the wiper arm 16
The pivot shaft 15 retreats by a distance A between the upper end of the cylindrical support portion 12 of the pivot holder 11 and the pivot shaft 6a.
When the pivot holder 11 moves downward by the extension amount B of the extension portion 20 of the plate 8, the total (A +
B) The base end portion 16a of the minute wiper arm 16 can be retracted downward, and the load body for the impact load and the wiper device 1 can be moved.
0 damage can be reduced.

Moreover, since the amount of protrusion of the pivot shaft 15 from the upper end of the cylindrical support portion 12 of the pivot holder 11 can be reduced to only A, the support rigidity of the wiper arm 16 can be secured, and the basic performance of the wiper device 10 is improved. it can.

Further, the amount of protrusion of the pivot shaft 15 is A, which is shorter than the amount of protrusion C of the conventional example.
As shown in (a) and (b), the height of the mounting portion 9 of the pivot holder 11 can be increased, and therefore, if the amount of retraction movement (A + B) is the same as that of the conventional example C, the link member 1
The height d of the front cowl portion 1 for preventing the interference of the front cowl 7 can be reduced by (CA) with respect to D of the conventional example, and the degree of freedom of the vehicle body structure can be increased accordingly.

Further, since it is only necessary to add a simple structure for providing the extension portion 20 to the plate 8, the cost can be reduced as compared with the case where the pivot holder has a complicated structure as in the conventional example. be able to.

Although FIG. 1 shows an example in which the extending portion 20 is provided only at the front portion of the mounting portion 9, as shown in FIG. It is needless to say that it may be provided. Further, when the extension portion 20 is provided only on one of the front portion and the rear portion of the mounting portion 9 of the plate 8, the bending direction of the plate 8 is reduced on the side where the extension portion 20 is not provided so as to reduce the bending rigidity. A plurality of holes may be formed at appropriate intervals, or an arc-shaped or zigzag-shaped bent portion may be provided, so that the stretching action of the stretched portion 20 is restricted by the rigidity of the side where the stretched portion 20 is not provided. Can be avoided,
The above operation can be obtained smoothly.

In the example shown in FIG. 1, an example in which the bead 21 is formed as the extending portion 20 is shown. However, as shown in FIG. 2, the plate 8 is divided and the divided portions 22a and 22b are overlapped. In this state, they may be joined by spot welding 23 so as to be separated when a predetermined load or more is applied. As shown in FIG. 3, a plurality of vertically long holes 24 are formed in at least one of the divided portions 22a and 22b, and fastened and fixed with bolts and nuts 25, and fastened and fixed when a predetermined load or more is applied. The divided portions 22a and 22b may be configured to slide up and down to extend against the force.

[0022]

According to the wiper device for an automobile of the present invention,
As described above, when an impact load is applied to the base end of the wiper arm from above, the pivot shaft retreats and moves by the distance between the base end of the wiper arm and the upper end of the pivot holder, and the extension of the plate extends. Since the pivot holder moves by the amount of extension, the base end of the wiper arm can be retracted and moved downward by the sum thereof, and the amount of protrusion of the pivot shaft from the upper end of the pivot holder can be reduced, so that the support rigidity of the wiper arm is reduced. The height of the pivot holder mounting part of the plate can be increased by the same amount as the amount of protrusion of the pivot shaft can be secured, and the height dimension of the front cowl part can be reduced if the retraction movement amount is the same, and the body The degree of freedom of the structure can be increased, and the cost can be reduced because of the simple configuration in which the plate is provided with the extending portion.

Further, if means for reducing the bending rigidity of the plate is provided on the side of the front and rear portions of the plate where the pivot holder is fixed, where the extension is not provided, the rigidity of the side on which the extension is not provided may be reduced. It is possible to prevent the stretching action of the stretching portion from being restricted, and the above action can be obtained smoothly.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of one embodiment of a vehicle wiper device of the present invention.

FIG. 2 is a vertical sectional side view showing a schematic configuration of a modification of the embodiment.

FIG. 3 is a longitudinal sectional side view showing a schematic configuration of another modification of the embodiment.

4A and 4B show a comparison between a conventional example and a vehicle wiper device of the present embodiment, wherein FIG. 4A is a longitudinal sectional side view of the conventional vehicle wiper device, and FIG. 4B is a view of the vehicle wiper device of the present embodiment. It is a vertical side view of a schematic structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front cowl part 8 Plate 9 Attachment part 10 Wiper device 11 Pivot holder 15 Pivot shaft 16 Wiper arm 16a Base end part 20 Extension part

Claims (2)

[Claims] 1. A wiper device for a vehicle, wherein a base end of a wiper arm is fixed to an upper end of a pivot shaft rotatably supported by a pivot holder, and the pivot shaft projects upward from the upper end of the pivot holder by a suitable length. In the above, a pivot holder is attached to a plate that is laid forward and backward on the front cowl portion, and at least one of a front portion and a rear portion of the attachment portion of the pivot holder of the plate is provided with an extension portion that extends when a predetermined load or more is applied. An automotive wiper device characterized by the above-mentioned. 2. The method according to claim 1, wherein a means for reducing the bending rigidity of the plate is provided on a side of the front and rear portions of the mounting portion of the plate where the pivot holder is not provided with the extension portion. Automotive wiper device.