JPH0446088Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wiper arm of a wiper device for wiping the window glass of a vehicle.

[Conventional technology]

The wiper device has a blade attached to the tip of the wiper arm, and the base end of the wiper arm is fixed to a shaft that rotates back and forth to wipe the surface of the window glass. In this case, an arm shank having a U-shaped cross section is rotatably supported on a base end support, and a tension spring is tensioned between the arm shank and the support to press the blade against the glass surface. As shown in Fig. 2, the connection between this support and the arm shank is achieved by press-fitting a copper bushing 2 into an aluminum die-cast support 1, using this bushing 2 as a bearing, and connecting the SUS material with a hinge pin made of SUS material. It has a structure that supports an arm shank 4 made of wood or SPG material.

[Problem that the invention attempts to solve]

Such wiper arms are constantly exposed to the outside air, and in particular, in cold regions, salt water adheres to them due to rock salt sprinkled to prevent freezing, and in coastal areas, from seawater. Moreover, as mentioned above, the joint between the wiper arm support 1 and the arm shank 4, to which salt water adheres, is a collection of dissimilar metals, and the difference in potential between the bushing 2, which has a high potential, causes electrolytic corrosion to occur on the support 1 and arm shank 4, which have a low potential. do. As a result, this electrolytic corrosion first appears on the aluminum support 1, which has a large potential difference with the bushing 2. The salt water that has entered the joint surface between the support 1 and the bushing 2 causes the paint film on the support 1 to swell and peel off, expanding the area.
The paint coating of the arm shank 4 is also scratched at the part facing the bushing 2 due to its own rotation.
Electrolytic corrosion begins and peeling occurs. And support 1
The peeled off coating of the arm shank 4 enters the opposing surface of the bushing 2 and the arm shank 4, and the surface corrosion and rotational resistance of that part of the arm shank 4 due to electrolytic corrosion increases, which deteriorates the wiper arm's ability to follow the glass surface. This results in a decline in the wiping performance of the wiper device.

The purpose of the present invention is to maintain good wiping performance and appearance of the wiper device over a long period of time by preventing electrical corrosion at the joint between the support 1 and the arm shank 4.

[Means to solve the problem]

This invention consists of a painted aluminum support 1
a cylindrical bushing 2 press-fitted into the support 1; a hinge pin 3 inserted into the bushing 2; In the wiper arm, the bushing 2 is formed by insert-molding a cylindrical copper-based metal 6 into a resin that covers the outer peripheral surface and both end surfaces of the metal 6. , to achieve the aforementioned objectives.

〔Example〕

Hereinafter, an embodiment of the present invention will be described based on FIG. 1 is a painted support made of die-cast aluminum. A cylindrical bushing 2, which will be described later, is press-fitted into the support 1. 3 is SUS
A hinge pin made of wood. 4 is SUS material or
An arm shank with a U-shaped cross section made of steel plate made of SPG material, straddling support 1 and hinge pin 3.
through the hole in arm shank 4 and the bushing,
Support 1 by caulking one end of hinge pin 3
It is assembled into. The arm shank 4 is painted on the inner surface when it is in a component state, and on the outer surface after it is assembled to the support 1 together with the outer surface of the hinge pin, which is the same as in the past.

The bushing 2 is composed of a cylindrical copper-based metal 6 and a resin 5 covering its outer peripheral surface and both end surfaces, and is manufactured by insert molding.

During operation of such a wiper arm, the hinge pin 3 slides against the copper-based metal 6.
Arm shank 4 rotates relative to support 1,
As before, a tension spring (not shown) stretched between the support 1 and the arm shank 4 presses a blade (not shown) against the window glass. The ability to follow the curved surface of the window glass is as follows: Armshank 4
The rotation relative to the support 1 is achieved by the sliding movement of the copper-based metal 6 and the hinge pin 3, which is favorable. Moreover, even if salt water adheres to the wiper arm, the copper metal 6 and the aluminum support 1 and the metal 6 and arm shank 4 are isolated by the resin 5 of the bushing 2, so that no electrolytic corrosion occurs. . Therefore, the paint coatings on the support 1 and the arm shank 4 do not peel off due to electrolytic corrosion, and the peeled coatings do not get between the arm shank 4 and the bushing 2, resulting in a good appearance for a long time. Wiping performance can be maintained.

[Effect of idea]

As described above, in the present invention, the bushing 2 that rotatably supports the arm shank 4 on an aluminum support is composed of a copper-based metal 6 and a resin 5 that covers the outer peripheral surface and both end surfaces of the metal 6. 1
Since the contact surface between the metal 6 and the arm shank 4 is electrically isolated, electrical corrosion caused by salt water can be prevented even in cold regions and coastal areas, and the paint film will not peel off, maintaining the appearance and wiping performance for a long time. It has the effect of being able to be maintained well. Moreover,
The resin 5 that covers the outer circumferential surface and both end surfaces of the metal 6 is insert-molded with the metal 6 to form the bushing 2, so it can be conveniently assembled in the same manner as before without impairing the assemblability. good.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention. FIGS. 2A and 2B are a cross-sectional and perspective view showing a conventional example. 1... Support, 2... Butching, 3... Hinge pin, 4... Arm shank, 5... Resin,
6...Metal.

Claims (1)

[Scope of utility model registration request] A painted aluminum support 1, a cylindrical bushing 2 press-fitted into the support 1, a hinge pin 3 inserted into the bushing 2, and a U-shaped cross section that connects to the support 1 through the hinge pin 3. Rotatably supported steel plate arm shank 4
A wiper arm comprising a wiper arm characterized in that the bushing 2 is formed by insert molding a cylindrical copper-based metal 6 with a resin 5 covering the outer peripheral surface and both end surfaces of the metal 6.