JPH07246916A - Wiper device - Google Patents

Abstract

PURPOSE:To keep a water film thin while making a sliding resistance of a wiper blade small so as to restrain glitter and a white film after wiping off glass by setting an angle between a window shield panel and a lip part within a specified range during wiping off motion. CONSTITUTION:A wiper blade 21 for wiping the surface of a front window shield glass 3 is composed of a base part 23, a neck part and a lip part 27, and in the base part 23, the blade 21 is held by a holding hardware which moves for wiping off along the surface of the front window shield glass 3. In such wiper blade 21, such a means is applied to set an angle theta between the surface of the front window shield glass 3 and the lip part 27 to satisfy 30 deg.<=theta<=55 deg. when the wiper blade is moved for wiping off. Namely, the wiper blade 21 is subjected to a coating process by using nylon or molybdenum disulfide and as a mans for improving rigidity, a film of cross-linked N- methoxymethyl nylon containing an amount, from 10 to 50% by weight, of molybdenum bisulfide power or graphite powder may be formed on the surface of the wiper blade 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper device suitable for wiping the surface of a windshield panel of an automobile or the like.

[0002]

2. Description of the Related Art As a conventional wiper device, for example, FIGS. 11 and 1 described in JP-A-59-34963 are disclosed.
2, there are those shown in FIG. This wiper device 1 wipes the surface of a windshield 3 as a windshield panel of an automobile. The wiper device 1 has a holding member 9 supported by a wiper arm 5 via a lever as shown in FIGS. 11 and 12,
A wiper blade 11 is supported by the holding metal fitting 9. The wiper blade 11 is composed of a base portion 13, a neck portion 15 and a lip portion 17 as shown in FIG. The base portion 13 is held by the holding metal fitting 9, and the neck portion 15
Connects the base portion 13 and the lip portion 17, and the lip tip portion 19 of the lip portion 17 slides on the surface of the windshield 3.

When the windshield glass 3 is wiped, the wiper blade 11 receives the pressing force F as shown in FIG. 14, and the lip tip portion 19 receives the frictional force μF from the windshield glass 3 in the direction opposite to the wiping movement direction. . Due to this frictional force μF, the lip portion 17 makes a lip contact angle θ with the windshield 3 as shown in FIG.
The glass 3 is tilted and is wiped while forming a water film on the surface of the glass 3. Such a water film is necessary for the wiper blade 11 to move smoothly with respect to the windshield glass 3, and a structure for forming the water film is shown in FIG. 16 described in JP-A-60-226343. There is something.

This makes the cross-sectional shape of the wiper blade 11 uneven so as to balance the overall wear of the wiper blade 11. As a result, by balancing wear, the water film becomes uniform, and good wiping performance can be obtained.

[0005]

However, in such a conventional wiper blade 11 as described above, no consideration has been given to the optimization of the contact angle θ with respect to the windshield 3. Therefore, the overall wear of the wiper blade 11 can be balanced, but when the frictional force on the windshield 3 becomes high overall, the lip contact angle θ decreases to nearly 10 degrees, and the amount of water left unblown is reduced. May increase.

In particular, when an oil film is present on the windshield glass 3 or when a commercially available water repellent agent is used for the water repellent treatment, the glass surface immediately after being wiped out has a glare, or the water film has fine water droplets. In some cases, a white film may be left behind, resulting in a feeling of strangeness to the driver, and improvement thereof has been desired.

Therefore, an object of the present invention is to provide a wiper device capable of further improving the wiping performance by optimizing the contact angle of the wiper blade.

[0008]

In order to solve the above-mentioned problems, the invention of claim 1 is provided with a wiper blade for wiping the surface of the windshield panel, which comprises a base portion, a neck portion and a lip portion. The base portion is held by a holding jig that wipes and moves along the windshield panel and has an abutting surface facing the windshield panel side, and the neck portion is the windshield panel with respect to the base portion and the base portion. A lip located on the side of the windshield panel, the lip having a certain gap with respect to the abutment surface of the base, a certain width in the wiping direction, and sliding on the surface of the windshield panel. It has a tip portion, and means for setting the angle θ formed by the windshield panel and the lip portion at 30 ° ≦ θ ≦ 55 ° at the time of wiping movement. Characterize.

According to a second aspect of the present invention, there is provided the wiper device according to the first aspect, wherein the means is a means for improving the rigidity of the wiper blade.

A third aspect of the present invention is the wiper device according to the second aspect, wherein the means has a wall thickness of the lip portion to the right ≧
It is characterized by including it as 0.7 mm.

A fourth aspect of the present invention is the wiper device according to the second or third aspect, wherein the rigidity improving means is a coating treatment with nylon or molybdenum difluide.

A fifth aspect of the present invention is the wiper device according to the second or third aspect, wherein the rigidity improving means includes 10 to 50 molybdenum difluoride powder or graphite powder in the film on the surface of the wiper blade. A cross-linked N-methoxymethylated nylon containing 1% by weight is formed in a thickness of 1 to 50 μm.

[0013]

According to the invention of claim 1 of the above means, the angle θ formed by the windshield panel and the lip portion during the wiping movement of the wiper blade can be set to 30 ° ≦ θ ≦ 55 °, and the water droplets can be completely removed. It can be removed to prevent the formation of a white film.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, θ can be set to 30 ° ≦ θ ≦ 55 ° by improving the rigidity of the wiper blade during the wiping movement, and the water droplets are completely removed. It is possible to prevent the occurrence of white film.

According to the third aspect of the invention, in addition to the effect of the second aspect of the invention, the thickness of the lip portion is set to t ₂ ≧ 0.7 mm, so that θ is set to 30 ° ≦ θ ≦ 55 ° during the wiping movement. It is possible to completely remove water droplets and prevent the formation of a white film.

According to the invention of claim 4, in addition to the effect of the invention of claim 2 or claim 3, the rigidity of the wiper blade is improved by the coating treatment of nylon or molybdenum difluoride, and θ is 30 ° ≦ θ ≦ during wiping movement. The temperature can be set to 55 degrees, the water droplets can be completely removed, and the formation of a white film can be prevented.

In a fifth aspect of the present invention, crosslinked N-methoxymethylated nylon containing 10 to 50% by weight of difluidized molybdenum powder or graphite powder is formed on the surface of the wiper blade in a thickness of 1 to 50 mm. At the time of wiping, θ can be set to 30 ° ≦ θ ≦ 55 °, water droplets can be completely removed, and the formation of a white film can be prevented.

[0018]

Embodiments of the present invention will be described below. 1 and 2 relate to an embodiment of the present invention. FIG. 1 is a sectional view of a wiper blade 21 in a wiper device, and FIG. 2 is an operation explanatory view. The overall structure of the wiper device in this embodiment is substantially the same as the structure shown in FIGS. The wiper blade 21 is configured to wipe the front windshield panel, for example, the surface of the front window glass 3, and includes a base portion 23, a neck portion 25, and a lip portion 27.

The base portion 23 is held by a holding metal fitting 29, which is a jig for wiping along the windshield glass 3 (see FIG. 2), and has a contact surface 31 facing the windshield glass 3 side. . Specifically, the base portion 23 is divided into a head portion 35 and a receiving portion 37 via a slit 33. The head 35 is fitted and held by the holding fitting 29. Collar portions 39a and 39b are provided on both sides of the receiving portion 37 in the blade width direction. The contact surface 31 is configured as a lower surface of the receiving portion 37.

The neck portion 25 connects the base portion 23 and the lip portion 27 to the front window glass (windshield panel) 3 side with respect to the base portion 23, and has a thickness t ₁ in the blade width direction, The height is L ₁ .

The lip portion 27 has shoulder portions 41a and 41b on both sides in the blade width direction, that is, the wiping movement direction, and a lip tip portion 43 at the lower end. Shoulders 41a, 41b
Has a constant gap L ₂ with respect to the contact surface 31 of the base portion 23 and a constant width t ₃ in the wiping direction.

The lip tip portion 43 has an edge portion 45, has a thickness of t _{2 in} the wiping direction, and has a height L ₄ . The total height L _{3 of the} lip portion 27 from the current surface 31 is L ₃ .

In the embodiment of the present invention, the angle θ formed by the surface of the windshield 3 as the windshield panel and the lip portion 27 during the wiping movement is 30 ° ≦ θ.
Means for setting ≦ 55 degrees are provided. Said means are provided as means for improving the rigidity of the wiper blade 21 in this embodiment. That is, the wiper blade 21 is coated with nylon or molybdenum disulfide. Specifically, as a rigidity improving means, a crosslinked N-methoxymethylated nylon containing 10 to 50% by weight of difluidized molybdenum powder or graphite powder is formed on the surface of the wiper blade 21 in a thickness of 1 to 50 mm. It is a thing.

Next, the coating process for the wiper blade 21 will be specifically described. First, the wiper blade 21 is formed by using synthetic rubber or natural rubber as a base rubber. In this case, the composition of various additives and various conditions are set so as to have the most suitable flexibility for the wiper blade 21. Next, a film of crosslinked N-methoxymethylated nylon is formed on the surface of the molded product. That is, a solution in which N-methoxymethylated nylon, its crosslinking catalyst, and molybdenum difluoride powder or graphite powder are dissolved in a solvent is applied to the target site of the molded article. When the solution is applied to the entire surface of the molded product, it can be treated by immersing it in the solution and immediately pulling it up or spraying it.
Furthermore, when applying only to the lip portion 27, it may be applied with a brush or a spray. The amount applied at this time is adjusted so that the thickness of the N-methoxymethylated nylon film formed on the surface of the molded product is 1 to 50 mm. This is then heated to crosslink the N-methoxymethylated nylon.

In this way, the rigidity of the wiper blade 21 can be improved. Also wiper blade 21
Good film peculiar to nylon due to the film formed on
Provides high wear resistance and high weather resistance. Also, since the film formed is thin, the original flexibility of the molded product is not impaired. Further, the slippage of the wiper blade 21 is further improved by the molybdenum difluoride powder or the graphite powder. The rigidity of the wiper blade 21 is improved by setting the thickness t _{2 of the} lip portion and the thickness t ₁ of the neck portion and coating treatment, and the contact angle θ with respect to the windshield glass 3 can be set within a target range of 30 to 55 degrees. Of. The reason why the contact angle θ of the wiper blade 21 is limited to the above range is not only to improve the water droplet removal performance, but also to prevent the formation of a glare or a white film on the windshield 3 after being wiped and a sliding resistance ( This is because it has been possible to confirm by experiment, etc., a range that satisfies both of the contradictory characteristics of not increasing the increase of the friction coefficient) and the prevention of chattering and the reversal performance.

Further description will be given below. First, the relationship between the water film (white film) generated after wiping and the contact angle will be described. Generally, the blade lip (lip portion 27) applies a pressing force F to the windshield 3 while sliding on the windshield 3 at a speed V. At this time, the pressure P applied to the windshield 3 is the pressing force F and the contact area S between the lip portion 27 and the windshield 3.
However, if the pressing force F is the same, the pressure P
Is larger the smaller the contact area.

Here, the relationship between the contact area and the contact angle between the lip tip portion 43, the windshield 3, and the contact angle will be described with reference to FIG.

Now, when the cross section of the wiper blade 21 in the longitudinal direction is viewed, the size of the contact area is L (L ₁ + L
₂ ) and L is proportional to the distance X from the tip point P.

At this time, L is

[Equation 1] Indicated by.

When the tip portion Q is pushed by the force F to change from X = 0 to X = X0, the pressing force F applied to the blade is given by the spring constant K of the blade,

[Equation 2] Indicated by.

Therefore, when the size L of the contact area when X = X0 is L0, the pressure P is Therefore, when the pressing force F is constant, L0 is minimum,
P is the maximum.

Further, from the equation (2), the pressure P is

[Equation 3] Therefore, when F is constant, L0 is minimum, and P is
Is the maximum.

From equation (2),

[Equation 4] Becomes Therefore, it is considered that when the pressing force F is the same, the pressure P is maximum when θ = 45 degrees as shown in FIG. 4, and the water film (white film) formed is minimum.

FIG. 5 shows the result of an experiment in which the relationship between the contact angle and the visibility was investigated.
When the contact angle is 30 degrees or more like the wiper blade 21 (stiffness up blade) of this embodiment, the visibility is in the range of 3 when the amount of water film is large and the visibility score is within the range of 3 degrees. I was able to confirm that the score of was raised.

FIG. 6 shows the result of examining the relationship between the contact angle and the reversal property. This shows the range of the angle between the reversible lip and the glass surface when the wiper blade reaches the reversal position. The larger the range, the higher the reversal performance. In other words, it can be said that the blade can be inverted when the sliding direction changes even if the angle at the inverted position is high (the lip portion is lying down). If the blade has a contact angle of 55 degrees or more with the lip portion, the reversal performance of the blade deteriorates and it becomes difficult to reverse the blade, which causes another problem of judder or chattering. Therefore, in the embodiment of the present invention, the range of the contact angle is 30 degrees or more and 5
It was set to 5 degrees or less.

Next, in order to set the target contact angle θ in the range of 30 ° to 55 °, the rigidity of the wiper blade 21 is increased by the coating process, and the thickness t _{1 of the} neck portion and the thickness t _{2 of the} lip portion are changed. We investigated experimentally whether it would affect.

FIG. 7 shows changes in the contact angle θ with respect to the lip portion wall thickness t ₂ of the uncoated wiper blade. When the thickness t _{2 of the} lip portion is 0.65 mm, the contact angle θ increases about twice when the thickness t _{2 of the} lip portion exceeds twice, but θ does not change so much when the thickness t ₂ is 2 to 3 times. It was

FIG. 8 shows changes in each contact θ with respect to the neck thickness t ₁ . When the neck thickness t ₁ to 0.45 mm, the neck thickness t ₁ is a wiping operation in shoulder 41a or 41b exceeds 2 times longer strike the time being 31,
The entire lip becomes unstable and chatters. Further, even if the thickness of the neck portion was increased, the contact angle θ did not change so much, and the effect was smaller than the thickness of the lip portion.

FIG. 9 shows changes in the contact angle θ with respect to the lip wall thickness t ₂ when the coating is applied. When the thickness t _{2 of the} lip portion is 0.65 mm, the contact angle θ increases about twice when the thickness t _{2 of the} lip portion is increased about 1.4 times, but when it exceeds twice, θ becomes large. .

From the results of these experiments, in the embodiment of the present invention, the wiper blade 21 was coated as described above, and the lip portion thickness t ₂ ≧ 0.7 mm and the neck portion thickness t ₁ ≦ 0. It was 6 mm.

FIG. 10 shows a comparison between the current blade in which no consideration is given to the contact angle θ and the wiper blade of the embodiment of the present invention provided with means for limiting the range of the contact angle θ. This comparison shows the relationship between the contact angle θ and the amount of water film obtained by image processing. The amount of the water film was determined by irradiating the windshield glass 3 with light and reflecting the light on the water film immediately after sliding the wiper blade with a video and processing the image. It was confirmed that the wiper blade 21 of the embodiment of the present invention has a high contact angle in both open and closed states, and that the water film amount decreases accordingly. Therefore, in the embodiment of the present invention, the wiper blade 21 is subjected to the coating treatment as described above, and the lip portion thickness t ₂ ≧ 0.7 mm and the neck portion thickness t ₁ ≦ 0.6 m.
As m, the contact angle θ satisfies the range of 30 to 50 degrees during the wiping operation, and it is possible to keep the water film small. Further, chatter does not occur and the reversing performance is secured, and good wiping performance can be obtained.

The means for keeping the range of the contact angle θ within the range of 30 ° to 55 ° includes coating treatment and lip wall thickness t.
_{2. It} includes both the adjustment of any _one of the neck wall thicknesses t ₁ alone or the adjustment of any combination thereof.

[0043]

As is apparent from the above, according to the invention of claim 1, the angle θ formed between the window shield panel and the lip portion during the wiping movement is set to 30 ° ≦ θ ≦ 55 °.
It is possible to keep the water film and reduce the sliding resistance of the wiper blade while keeping the water film small and to prevent glare and white film after wiping. In addition, chattering of the wiper blade does not occur, and reversal performance can be secured. Therefore, good wiping performance can be obtained, and the driver can be provided with a comfortable driving condition.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the wiping performance can be improved while keeping the water film (white film) small by improving the rigidity of the wiper blade.

According to the third aspect of the invention, in addition to the effect of the second aspect of the invention, the wiping performance can be improved while keeping the water film small by setting the thickness of the lip portion to t ₂ ≧ 0.7 mm. Therefore, the manufacture of the wiper blade becomes easy.

According to the invention of claim 4, in addition to the effect of the invention of claim 3, the rigidity of the wiper blade can be improved by the coating treatment with nylon or molybdenum disulfide, and the sliding resistance can be improved without impairing the flexibility of the wiper blade. Can be reduced.

According to the invention of claim 5, in addition to the effect of the invention of claim 3, a crosslinked N-methoxymethylated nylon containing 10 to 50% by weight of difluidized molybdenum powder or graphite powder in a coating film of 1 to 50 mm is used. By forming the wiper blade with a thickness, the rigidity of the wiper blade can be improved. Therefore, it is possible to further reduce the sliding resistance without impairing the flexibility of the wiper blade.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a wiper blade according to an embodiment of the present invention.

FIG. 2 is an explanatory view of the action of a lip contact angle θ.

FIG. 3 is an explanatory diagram of a wiping operation.

FIG. 4 is a graph showing the relationship between contact angle and pressure.

FIG. 5 is a graph illustrating a relationship between a contact angle and a visibility score.

FIG. 6 is a graph illustrating the relationship between contact angle and reversal performance.

FIG. 7 is a graph showing an experimental result of a relationship between a lip portion wall thickness of a wiper blade not coated and a contact angle.

FIG. 8 is a graph showing an experimental result of the relationship between the neck thickness and the contact angle.

FIG. 9 is a graph showing an experimental result of a relationship between a lip portion wall thickness of a coated wiper blade and a contact angle.

FIG. 10 is a graph showing the relationship between the contact angle and the amount of water film.

FIG. 11 is a perspective view of a front portion of an automobile showing a conventional wiper device.

FIG. 12 is a perspective view showing an entire conventional wiper blade.

13 is a sectional view taken along the line XIII-XIII in FIG.

FIG. 14 is an explanatory diagram of a wiping operation.

FIG. 15 is an explanatory diagram of a lip contact angle.

FIG. 16 is a cross-sectional view of a wiper blade according to a conventional example.

[Explanation of symbols]

21 Wiper blade 23 Base portion 25 Neck portion 27 Lip portion 29 Holding metal fitting (holding tool) t ₁ Neck portion thickness t ₂ Lip portion thickness θ Contact angle

Claims (5)

[Claims] 1. A wiper blade configured to wipe a surface of a windshield panel, the wiper blade including a base portion, a neck portion, and a lip portion, wherein the base portion is held by a holding jig that wipes and moves along the windshield panel. And has a facing surface facing the windshield panel side, the neck portion connects the base portion and a lip portion located on the windshield panel side with respect to the base portion, and the lip portion is , With a constant gap in the wiping direction and a constant width in the wiping direction, and with a lip tip that slides on the surface of the windshield panel. A wiper device characterized in that an angle θ formed by is set to 30 ° ≦ θ ≦ 55 °. 2. The wiper device according to claim 1, wherein the means is a rigidity improving means for the wiper blade. 3. The wiper device according to claim 2, wherein the means includes setting the wall thickness of the lip portion to the right ≧ 0.7 mm. 4. The wiper device according to claim 2 or 3, wherein the rigidity improving means is a coating treatment with nylon or molybdenum difluoride. 5. The wiper device according to claim 2 or 3, wherein the rigidity improving means forms a molybdenum difluoride powder or a graphite powder in a film on the surface of the wiper blade.
A wiper device comprising a crosslinked N-methoxymethylated nylon containing 1 to 50% by weight and having a thickness of 1 to 50 μm.