JPH0134909Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wiper blade rubber, and more particularly to a wiper blade rubber that reduces the generation of abnormal noise when the wiper is driven.

[Prior Art] Wipers are used to wipe raindrops from automobile window glasses and the like. As shown in FIG. 3, this wiper includes a wiper blade rubber 10, a back plate 20 that fixes the back of the wiper blade rubber 10, and two small joints 30 that hold the back plate at regular intervals at both ends. A large joint piece 40 that rotatably holds the center part of this small joint piece 30
and an arm 50 that holds the central portion of the large joint 40 and transmits the swing motion from the electric motor.

As shown in FIG. 4, a typical example of a conventional wiper blade rubber 10 includes a swinging part 13 having a lip part 14 with one end protruding in a lip shape in cross section, and a base part 11 to which a back plate 20 is fixed.
and a neck portion 12 interposed between the swinging portion 13 and the base portion 11. This conventional wiper blade rubber 10 bends left and right at the tip of the lip part 14, and the entire swinging part 13 can swing left and right by the neck part 12 interposed between the base 11 and the swinging part 13. , the tip of the lip portion 14 can slide along the surface of the window glass.

[Problems to be solved by the invention] As shown in FIG. 5, in the conventional wiper blade rubber configured as described above, the lower end portion A of the base portion 11 and A swinging portion 1 faces the lower end portion A with the neck portion 12 in between.
The upper ends B of 3 were touching and separating.
That is, when the lip portion 14 slides in one direction on the glass surface 60, the lower end A of the base portion 11 and the upper end B of the swinging portion 13 opposing thereto are in contact with each other. Also, the neck portion 12 is connected to the lower end A and the upper end B.
The lower end of the base 11 located on the opposite side of the
A' and the upper end B' of the swinging portion 13 facing thereto are separated from each other. And the lip portion 14 has a glass surface 60
When the sliding direction is reversed, the tilt of the swinging part 13 is reversed, and the lower end A separates from the upper end B.
The lower end A' and the upper end B' contact each other to form the lip part 14.
slides in the opposite direction.

Conventionally, the base and swinging parts of wiper blade rubber are made of solid rubber such as natural rubber, so when the rubber comes into contact with the rubber as described above, the impact at the time of contact often generates abnormal noise. Since this noise is generated when the wiper is reversed, it is intermittent and may cause discomfort to vehicle occupants.

This invention was made in view of the above circumstances,
The objective is to provide a wiper blade rubber that can reduce noise by absorbing impact upon contact.

[Means and effects for solving the problems] The present invention includes a thick base, a swinging section having a substantially triangular cross section, a neck interposed between the base and the swinging section, and the swinging section. In an elongated wiper blade rubber consisting of a thin plate-shaped lip provided at the tip of the moving part, the base part faces the swinging part and the swinging part moves between the swinging part and the swinging part. It is characterized in that at least one of the abutting surface portion and the surface portion of the swinging portion that faces the base and comes into contact with the base by swinging is softer than the other portion.

The outer shape of the wiper blade rubber of the present invention can be basically the same as the outer shape of conventional wiper blade rubber. That is, the wiper blade rubber of the present invention is composed of a base portion, a neck portion, a swing portion, and a lip portion. The base is generally formed thick in order to obtain rigidity in the longitudinal direction of the wiper blade rubber. Preferably, the base has grooves or ridges on both sides thereof for engagement with the back plate. The swinging portion has a substantially triangular cross section and is continuous with the base portion via a thin neck portion. Note that it is desirable that the neck portion be provided at the center of the base of the substantially triangular cross section. This swinging part is the part that swings when sliding back and forth on the glass surface, bending to the right or left at the neck part,
The swinging section swings left and right with respect to the base. The lip portion is a thin plate-shaped protruding portion provided at the tip of the swinging portion, which has a substantially triangular cross section.

The wiper blade rubber of the present invention can be mainly made of solid rubber as in the conventional wiper blade. A typical example of solid rubber is natural rubber, and other examples include chloroprene rubber, EPDM, etc., and these can be used alone or in combination. In addition to these rubber components, the solid rubber may contain components such as carbon black, a vulcanizing agent, and a filler. It is also desirable for the lip part to have low resistance during sliding, so natural rubber, EPDM, etc. can be used, but it is better to use a slippery rubber such as urethane rubber, SBR, butyl rubber, fluorine rubber, or chlorosulfonated rubber. is desirable. In this case, the interior of the lip portion may be made of solid rubber that is continuous with the swinging portion, and only the surface layer may be made of slippery rubber.

A feature of the present invention is that at least one of the surface portion of the base and the surface portion of the swinging portion that comes into contact with the swinging portion when the swinging portion swings is soft.

This soft surface uses a material that is softer than solid rubber, which is the main component of wiper blade rubber. That is, this soft material buffers the impact upon contact, making it possible to soften or prevent abnormal noise from occurring.

For example, a porous body is used as the soft substance. Resin foam, foamed rubber, etc. can be used for this porous body. In particular, urethane foam, EPDM foam, etc. are preferred.

It is also effective to use air as the soft material. In this case, the structure is such that the inner space is included in the surface portion.

Further, as the soft material, a soft rubber having a lower rubber hardness than the solid rubber used for other parts may be used. In this case, it is desirable to use a rubber whose hardness is about 5 to 15 degrees lower than that of the solid rubber. The rubber hardness here means the hardness according to JIS-K-6301.

The above-mentioned soft material is formed only on either the surface of the base that comes into contact with the swinging part when the swinging part swings, or the surface of the swinging part that comes into contact with the surface when it swings. However, it is preferable to form it on both sides.

The wiper blade rubber of the present invention can be manufactured by extrusion molding or the like in a conventional manner. If the soft material is a porous body or soft rubber, the soft material may be attached or welded after forming the wiper blade rubber base, but it is also possible to mold it at once by two-color extrusion molding, heat it, etc. Vulcanization and foaming are desirable because they not only reduce the number of steps but also enable integral bonding.

[Example] This will be explained below using examples.

(Example 1) FIG. 1 shows a cross section of a wiper blade rubber according to a first example of the present invention. This wiper blade rubber is composed of a base portion 1 having a polygonal cross section, a neck portion 2, a swinging portion 3 having a substantially triangular cross section, and a lip portion 4 provided at the tip of the swinging portion 3. The upper ends of the base 1, neck part 2, swinging part 3, and lip part 4 of this wiper blade rubber are made of flexible rubber mainly made of EPDM, and the lower end of the lip part 4 is made of slippery rubber made of SBR. There is. and the surface part of the lower end facing the swinging part 3 of the base 1 and the base 1 of the swinging part 3.
Porous bodies 1a and 3a made of EPDM foam are formed in an elongated shape on the surface of the upper end facing. By the way, the height of this wiper blade rubber is approximately 11.5 mm, the width is approximately 7 mm, the thickness of the lip portion 4 is 0.75 mm, and the height is 1.9 mm.
It is millimeter.

The wiper blade rubber of this first embodiment is
EPDM, SBR, and foamable EPDM are vulcanized and foamed after three-color extrusion molding, and are integrally bonded.

[Example 2] FIG. 2 shows a cross section of a wiper blade rubber according to a second example of the present invention.

This wiper blade rubber has a structure in which the lower end of the base 1 facing the swinging part 3 and the upper end of the swinging part 3 facing the base 1 enclose an internal space 5 in an elongated shape. This wiper blade rubber is foamed EPDM
The same material as that used in Example 1 was used except for omitting , and the product was manufactured by two-color extrusion molding and vulcanization.

[Operation of the Embodiment] When the wiper is driven, the lip portion slides on the glass surface and the neck portion 2 bends, causing the swinging portion 3 to incline and come into contact with the base portion 1. The impact at the time of this contact is buffered by the porous body or internal space provided at the contact portion of the base 1 and the swinging portion 3 being easily deformed, which softens or prevents the abnormal noise from occurring. It has an effect.

[Effects of the invention] The wiper blade rubber of the invention hardly generates abnormal noise when the wiper is driven, eliminating discomfort for vehicle occupants.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a wiper blade rubber according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of a wiper blade rubber according to a second embodiment of the present invention. FIG. 3 is a side view of the wiper. 4 and 5 show conventional wiper blade rubber, and FIG. 4 is a cross-sectional view thereof;
FIG. 5 is a sectional view of a main part showing the sliding state of the wiper blade rubber. 1, 11... base, 2, 12... neck part,
3, 13... Swinging part, 4, 14... Lip part, 1
a, 3a... Porous body, 5... Internal space.

Claims (1)

[Claims for Utility Model Registration] (1) A thick base, a swinging part with a substantially triangular cross section, and a neck part interposed between the base and the swinging part,
In an elongated wiper blade rubber consisting of a thin plate-shaped lip provided at the tip of the swinging part, the base part is opposed to the swinging part and the swinging part is caused to swing by the swinging of the swinging part. and at least one surface of the swinging part that faces the base and comes into contact with the base when swinging is softer than the other parts. Wiper blade rubber. (2) The wiper blade rubber according to claim 1, wherein the surface portion is porous. (3) The wiper blade rubber according to claim 1, wherein the surface portion includes an internal space. (4) The wiper blade rubber according to claim 1, wherein the surface portion is made of a rubber whose rubber hardness is 5 to 15 degrees lower than that of other portions.