JP6782875B1 - Blade fittings and blade support structure - Google Patents

Abstract

In the fixture 10, a unidirectionally long blade 3 made of an elastic member that wipes or scrapes off liquid or solid that spreads on the contact surface 2 by being pressed against the contact surface 2 is attached to the contact surface. The first support member 11 supported by the wiper arm that supports the two with a predetermined pressing force, and the base end side of the blade 3 supported by the leaf spring 14 against the first support member 11. A second support member 13 to be attached is provided. When the blade 3 is pressed against the contact surface 2 and slides relatively, the leaf spring 14 exerts a reaction force against the frictional force that moves the second support member 13 with respect to the first support member 11. Attach to add.

Description

The present invention relates to a unidirectionally long blade attachment and a blade support structure made of an elastic body that is pressed against the contacted surface to wipe off liquid spreading on the contacted surface or scrape off solids.

This type of blade is attached to a pressing support that supports the blade so that it is pressed against the contacted surface with a predetermined pressing force. By moving at least one of the contacted surface and the blade, the blade moves relatively on the contacted surface, and the liquid spreading on the contacted surface is wiped off. A typical blade is, for example, a wiper blade for wiping the glass of a vehicle.

For example, as in Patent Document 1, a blade rubber for wiping the wiping surface of a vehicle, a spring plate member, and a mounting means for connecting the spring plate member and the wiper arm are provided, and the wiper arm swings to reciprocate on the wiping surface. The wiper blades that are used are known. This mounting means has a swing mechanism and a connecting mechanism, and the swing mechanism is attached to a swing base attached to a spring plate member while holding the swing shaft, and to the swing base via the swing shaft. It has a swinging portion attached, and the connecting mechanism has a connecting base that can swing integrally with the swinging portion provided with a connecting shaft, and a wiper arm that is attached to the connecting base via the connecting shaft and is attached and detached. It has a connecting main body that can be connected. This wiper blade makes it possible to smoothly invert the blade rubber when turning back the round trip without causing a decrease in wiping performance.

Further, for example, a wiper for a window glass of an automobile provided with a frictional resistance noise eliminating device including a main frame and an elastic pressing blade, as in Patent Document 2, is known. In this window glass wiper, a pivot wall is provided in the center of the main frame, a movable seat having a locking rod is provided in the center of the pivot wall, and locking rods are provided on both side walls of the movable seat. Two elliptical working holes are formed laterally at the positions on both sides of the center, and the corresponding fixing pins are pierced on both side walls of the pivot wall so as to be pivotally attached. The movable seat can be elastically moved by the fixing pin using the lateral working hole, and a space is formed between the movable seat and the pivot wall to move the movable seat laterally. The urging oppressor is pivotally attached to both sides, and the movable seat is separated and assembled in a two-stage manner between the pivot wall and the locking rod and the wiper arm coupler are connected to form the movable seat. The oscillating friction resistance of the wiper is appropriate because the oppressive bodies provided on both sides of the wiper are urged and oppressed and the movable seat itself moves along the eccentricity of the lateral working hole formed in the side wall. The noise elimination effect is obtained by changing the angle and absorbing the resistance and frictional force from each direction by the suppression.

Japanese Unexamined Patent Publication No. 2008-238868 Japanese Unexamined Patent Publication No. 2014-162406

However, with the wiper blade of Patent Document 1, although the blade rubber can be smoothly inverted when simply turning back the round trip, the angle of the blade rubber is regulated by the engaging wall surface and is constant during wiping. The generation of chattering noise due to deterioration of the glass surface cannot be sufficiently prevented.

Further, in Patent Document 2, the urging member is used to urge the blade so as to suppress the swing around the center (yaw axis) in the longitudinal direction of the blade. However, since the blade is usually long, the yaw is used. Since a large rotational moment centered on the yaw axis is applied to the shaft, the spring constant becomes large when trying to exert the vibration damping function. Therefore, there is a problem that the urging member becomes too hard and the vibration damping function cannot be sufficiently exerted when a weak frictional force is generated when the liquid is present.

The present invention has been made in view of this point, and an object of the present invention is to prevent the generation of sound and to exert a stable vibration damping effect of the blade.

In order to achieve the above object, in the present invention, the blade is supported by the arm via a leaf spring.

Specifically, in the first invention, a blade long in one direction made of an elastic member that wipes or scrapes off a liquid or solid that spreads on the contacted surface by being pressed against the contacted surface is described above. A first support member supported by a pressing support portion that supports the contacted surface so as to press it with a predetermined pressing force,
It is provided with a second support member that is supported by the first support member via a leaf spring and to which the base end side of the blade is attached.
The leaf spring exerts a reaction force against the frictional force that moves the second support member with respect to the first support member when the blade is pressed against the contact surface and slides relatively. Attached to add.

That is, when the blade wipes the liquid on the contact surface, for example, when the state of the contact surface is not uniform in a part of the longitudinal direction of the blade, the liquid is between the blade and the contact surface. May disappear and the solids may come into contact with each other. However, according to the above configuration, when the blade attempts to move by swinging or twisting due to an increase in frictional force due to contact between solids, the leaf spring is appropriately deformed and the catch is alleviated. The generation of blade noise and vibration is suppressed. Then, when the frictional force is reduced again, the leaf spring applies a reaction force to the frictional force applied to the blade, so that the reduction of the liquid wiping effect due to the blade being tilted too much can be avoided. Further, even when the solid on the contacted surface is scraped off, the vibration of the blade is similarly suppressed and the generation of sound is prevented.

In the second invention, in the first invention,
The leaf thickness of the leaf spring is 0.2 mm or more and 0.8 mm or less.

That is, if it is thicker than 0.8 mm, the rigidity becomes too high and the vibration suppression effect cannot be exhibited, and if it is thinner than 0.2 mm, it cannot withstand the frictional force and plastically deforms. However, according to the above configuration, With an appropriate thickness, the vibration of the blade is effectively suppressed and the generation of sound is prevented.

In the third invention, in the first or second invention,
The above blade is a wiper blade that is long in one direction.
The pressing support portion is a wiper arm that presses the wiper blade at the central portion in the longitudinal direction of the wiper blade.

According to the above configuration, even if the state of the glass surface, which is the contact surface, is uneven in the longitudinal direction of the wiper blade and the wiper blade is likely to vibrate or chatter, the wiper blade has a wiping effect. The generation of chattering noise or vibration is effectively suppressed by moving moderately while maintaining the above.

In the blade support structure of the fourth invention, the blade fitting of any one of the first to third inventions and the blade fitting of the first to third inventions.
With the above blade
It is provided with the above-mentioned pressing support portion.

According to the above configuration, a blade support structure capable of exerting a stable vibration damping effect of the blade can be obtained.

As described above, according to the present invention, when the blade is pressed against the contacted surface and slides relatively, the frictional force that moves the second support member with respect to the first support member is resisted. By providing a leaf spring that applies a reaction force, it is possible to appropriately release the catch, prevent the generation of sound, and exert a stable vibration damping effect of the blade.

It is sectional drawing which shows the outline of the attachment tool of the blade which concerns on embodiment of this invention, and its periphery. It is a perspective view which shows the fixture of a blade and its periphery. It is a top view which shows the outline of the experimental apparatus for effect verification experiment. It is a table which compares the sound pressure and the vibration velocity of an Example and a comparative example in an effect verification experiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

-Blade support structure-
1 and 2 show a support structure 1 having a blade attachment 10 according to an embodiment of the present invention, and the support structure 1 is pressed against a contact surface 2 such as a window glass to be hit. It is provided with a unidirectionally long blade 3 made of an elastic body that wipes off a liquid W such as rainwater that spreads on the contact surface 2. The contacted surface 2 may be a substantially flat glass surface or a slightly curved glass surface. The blade 3 is made of a wiper rubber having a tapered tip, as shown in FIG. 1, for example. The blade 3 may include a leaf spring for reinforcement or the like extending in the longitudinal direction of the wiper rubber.

The blade 3 is supported by a wiper arm 4 as a pressing support portion so as to be pressed against the contacted surface 2 with a predetermined pressing pressure N via the attachment 10. The blade 3 of the present embodiment is not rotatable about a yaw axis 5 (Y axis) provided at the center in the longitudinal direction. Although the structure is complicated by that amount, the blade 3 may be configured to be rotatable around the yaw shaft 5. Although not shown in detail, the wiper arm 4 is configured to press the blade 3 with a predetermined pressing force N in the extending direction of the yaw shaft 5 by an urging spring or the like.

Specifically, as shown in an enlarged cross section in FIG. 1, the fixture 10 is provided with respect to the first support member 11 supported by the yaw shaft 5 at the tip of the wiper arm 4 and the first support member 11. It is supported by a leaf spring 14 extending in the longitudinal direction of the blade 3, and includes a second support member 13 to which the base end side of the blade 3 is attached. Further, in the second support member 13, a long plate-shaped lower portion 13a that supports the blade 3 extends together with the blade 3 in the extending direction of the blade 3. The lower portion 13a does not have to cover the entire upper side of the blade 3 as shown in FIG. 1, and may cover only the lower peripheral portion of the fixture 10.

The leaf spring 14 has, for example, a long and thin rectangular plate extending along the longitudinal direction of the blade 3, and the upper and lower ends are attached to the first support member 11 and the second support member 13, respectively, and become substantially vertical. There is. In this way, the first support member 11 and the second support member 13 are connected by using the leaf spring 14 with a simple structure, and an appropriate reaction force is applied to the blade 3. The fixed structure of the leaf spring 14, and the shapes of the first support member 11 and the second support member 13 are not limited to the rectangular plate shape as shown in the drawing.

The plate thickness of the leaf spring 14 is, for example, 0.2 mm or more and smaller than 1.5 mm (preferably 0.8 mm or less). If it is thinner than 0.2 mm, it may bend depending on how the load is applied. On the other hand, if the leaf spring 14 is made too thick, the vibration suppressing effect of the leaf spring 14 is not exhibited, and it is not much different from the rigid support.

-Effect verification-
Next, the effect verification performed by the blade / disc type tester 100, which is the bench tester illustrated in FIG. 3, will be described. This testing machine 100 utilizes line contact between a blade 3 (graphite wiper replacement rubber) having a length of 150 mm and a glass disc 101 (diameter 820 mm, thickness 8 mm), and is centered in the longitudinal direction of the blade 3 (yaw axis 5). Is located 300 mm from the center of the disk 101, and is arranged so that the longitudinal direction of the blade 3 and the radial direction of the disk 101 coincide with each other. The blade 3 is fixed to the fixture 10 similar to the above embodiment, a vertical load is applied to the center of the upper surface of the fixture 10, and the disc 101 is rotated by a motor.

An appropriate amount of purified water is sprayed and supplied to the surface of the disk 101, a vertical load (2.4 N) is applied to the blade 3 and the blade 3 is allowed to stand, and then the disk 101 is rotated at a constant speed (5 rpm) to cause the blade. The abnormal noise (measured by the sound level meter 102) and the vibration speed (laser Doppler vibrometer 102) of No. 3 were measured at the same time.

Experimental results using the fixture 10 having the leaf spring 14 of the above embodiment are shown in Examples 1 to 4 of FIG. In Examples 1 to 4, the plate thickness of the leaf spring 14 is gradually reduced from 0.8 mm to 0.2 mm. The measurement result of Comparative Example 1 having no leaf spring 14 is also shown. Further, in the fifth embodiment, the leaf spring 14 was not vertically erected as in the above embodiment, but was connected at an angle of 30 ° with respect to the vertical, and the measurement was performed in the same manner.

As a result of the measurement, the maximum sound pressure of Examples 1 to 5 using the fixture 10 of the above embodiment having damping performance was as small as 63.7 to 69.4 dB, whereas the leaf spring 14 was not provided. The maximum sound pressure of Comparative Example 1 was as large as 74.8 dB. It was found that this difference became even more remarkable when compared in terms of vibration velocity. In Examples 1 to 5, the vibration velocity was as low as 6.3 to 87.1 mm / sec, whereas in Comparative Example 1, it was as high as 166 mm / sec. In Comparative Example 1, since the leaf spring 14 was not provided and the support was rigid, vibration was generated and noise was generated. In this way, by using the fixture 10 of the present embodiment using the leaf spring 14 having an appropriate plate thickness, the vibration is substantially suppressed, the sound pressure is suppressed by 4.8 dB or more, and the vibration speed is 60 mm / sec or more. It turned out that it can be reduced.

In Example 5 in which the leaf spring 14 was tilted by 30 °, it was particularly effective in reducing the vibration speed. Although the experimental results are not shown, it was also found that when the leaf spring 14 was horizontal (90 °), the vibration increased and the vibration increased. It is known that the inclination angle is preferably 0 ° or more and 30 ° or less.

Next, the operation of the blade attachment 10 according to the embodiment of the present invention will be described. First, the wiper arm 4 is operated by operating an operation unit of the driver's seat (not shown). Then, as shown in FIG. 1, the blade 3 wipes off the liquid W on the surface of the contact surface 2 in accordance with the rotational operation of the wiper arm 4. At this time, if the state of the contacted surface 2 is not uniform in a part of the blade 3 in the longitudinal direction, the liquid W may disappear between the blade 3 and the contacted surface 2 and the solids may come into contact with each other.

However, in the present embodiment, the blade 3 is appropriately tilted due to the increase in the frictional force due to the contact between the solids, so that the blade 3 is relaxed and the vibration of the blade 3 is suppressed. When the frictional force is reduced again, the leaf spring 14 pushes back the blade 3, so that the reduction of the effect of wiping the liquid W due to the blade 3 being tilted too much can be avoided.

Further, when the vibration or chattering sound of the blade 3 is due to the contact between the solids of the blade 3 and the contact surface 2, the plate is slid so that the film of the liquid W is appropriately maintained. The spring constant k of the spring 14 is determined. That is, if the spring constant k is too large, it is too hard, and the blade 3 does not swing well and escape, and vibration and chattering noise due to contact between solids are generated. On the other hand, if the spring constant k is too small, the blade 3 is not stable, and the blade 3 is tilted too much to reduce the wiping effect of the liquid W. The appropriate spring constant k is determined in consideration of these factors.

Therefore, according to the blade attachment 10 according to the present embodiment, when the blade 3 is pressed against the contacted surface 2 and slides relatively, the second support member 13 is attached to the first support member 11. By providing the leaf spring 14 that applies a reaction force to the frictional force to be moved, it is possible to appropriately release the catch, prevent the generation of sound, and exert a stable vibration damping effect of the blade 3.

(Other embodiments)
The present invention may have the following configuration with respect to the above embodiment.

That is, in the above embodiment, the leaf spring 14 is attached perpendicularly to the blade 3, but it may be attached so as to be inclined with respect to the blade 3 as in the fifth embodiment. In such a case, since the reaction force of the leaf spring 14 is different between going and returning, it is suitable for a product that scrapes the solid on the contact surface 2. For example, it can be applied to a coater for coating paper as a sheet-like material constituting a contact surface with a coating liquid. In this case, since the blade 3 is tilted only in one direction, it is easy to adapt, the vibration of the blade 3 is suppressed, and the generation of sound is prevented.

In the above embodiment, the leaf spring 14 has a long and thin rectangular plate shape, but is not limited to this, and may have, for example, a shape in which the intermediate portion in the longitudinal direction is constricted and narrowed.

Further, in the above embodiment, the center of the yaw axis 5 and the center in the longitudinal direction of the wiper arm 4 are provided so as to coincide with each other, but these may be offset. Then, the urging force of the leaf spring 14 can be exerted more effectively.

As long as a reaction force can be generated, the leaf spring 14 is not limited to one configuration as in the above embodiment, and a plurality of leaf springs 14 may be arranged side by side. Further, as a means similar to the case of making an angle or offsetting, the spring constant (plate thickness, width, material) may be changed in the upper and lower parts and connected in the upper and lower parts.

It should be noted that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications and applications.

1 Support structure
2 Contact surface
3 blades
4 Wiper arm (pressing support)
5 Yaw axis
10 Fixtures
11 First support member
13 Second support member
13a bottom
14 Leaf spring 100 Testing machine 101 Disc 102 Sound level meter / Laser Doppler vibrometer

Claims (4)

A unidirectionally long blade made of an elastic member that wipes or scrapes off a liquid or solid that spreads on the contacted surface by being pressed against the contacted surface is pressed against the contacted surface. The first support member supported by the pressing support portion that is supported by pressing with
A leaf spring formed in an elongated plate shape and arranged so that its longitudinal direction is along the longitudinal direction of the blade .
It is provided with a second support member which is supported by the leaf spring with respect to the first support member and to which the base end side of the blade is attached.
One end of the leaf spring in the lateral direction is connected to the first support member, the other end in the lateral direction is connected to the second support member, and the blade is pressed against the contacted surface. allows the second support member by the frictional force when the blade is relatively slid with respect to the abutted surface is moved relative to the first support member is in the operation of the pressing support unit A blade attachment that also applies a reaction force to the second support member. The blade attachment according to claim 1.
A blade attachment having a leaf spring having a thickness of 0.2 mm or more and 0.8 mm or less. The blade attachment according to claim 1 or 2.
The above blade is a wiper blade that is long in one direction.
The pressing support portion is a wiper arm that presses the wiper blade at the central portion in the longitudinal direction of the wiper blade.
A blade attachment that is characterized by this. The blade attachment according to any one of claims 1 to 3,
With the above blade
A blade support structure including the pressing support portion.

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