JPH06321059A - Vehicle wiper - Google Patents

Abstract

PURPOSE:To provide a vehicle wiper capable of surely wiping off the moisture or dust, etc., on a surface-to-be-wiped, and moreover preventing the occurrence of a reversal shock and a chattering phenomenon at the time of reversal to sharply reduce noise. CONSTITUTION:A damping unit 50 is fixed to a secondary lever 32 positioned on a tip side. The damping unit 50 has constitution wherein damping oil is enclosed in a condition having a cavity in a closed case 52, and constantly moves together with a wiper blade 20. When a chattering phenomenon is about to occur in the wiper blade 20, damping oil in the damping unit 50 relatively moves in a reverse direction to this vibration to absorb vibration energy. This happens even at the time of the reversal of a wiper. Consequently the occurrence of a reversal shock and a chattering phenomenon is prevented to sharply reduce noise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle wiper for wiping a windshield glass of an automobile.

[0002]

2. Description of the Related Art In a vehicle wiper for wiping a windshield glass of an automobile, a wiper blade (blade rubber) moves in close contact with the windshield glass surface to wipe away raindrops and the like. Due to the difference in the friction coefficient between the portions of the windshield glass surface due to the oil film or the like attached to the windshield, self-excited vibration (so-called chatter phenomenon) of the wiper arm and the wiper blade may occur. When such chattering occurs, it not only results in poor wiping, but also causes abnormal wear of the blade rubber, reduced durability of the wiper drive link, and increased power consumption of the wiper motor. Was there. Moreover, such a chattering phenomenon is extremely annoying and annoying.

In this case, it is conceivable to simply increase the rigidity of the wiper arm to prevent the chatter phenomenon from occurring.
Since the wiper arm becomes heavy, problems such as reduced durability of the link part and increased reversing sound of the wiper blade occur,
It cannot be a fundamental measure.

Further, measures have been considered to prevent the chatter phenomenon from occurring by lowering the friction coefficient of the blade rubber, thereby solving the above-mentioned drawbacks. Various methods have been proposed as methods for reducing the friction coefficient of the blade rubber (for example, Japanese Patent Publication No. 46).
-33087, Japanese Patent Publication No. 57-2490, etc.).

However, in the measures described in the above-mentioned publications, the manufacture (surface treatment, etc.) of the blade rubber for reducing the friction coefficient of the blade rubber is complicated, and
Since the configuration is such that the occurrence of the chattering phenomenon is reduced by simply lowering the friction coefficient, there is a possibility that the original wiping performance of the wiper may be adversely affected.

Further, in order to reduce the impact when the wiper arm and the wiper blade are reversed, for example, a wiper having a cushioning member such as a spring around the pivot axis (for example, Japanese Utility Model Laid-Open No. 62-66860, Japanese Utility Model Publication). Three
No. 36452) or a wiper having a structure in which a damper is connected to a link rod for driving a wiper arm (for example, Japanese Utility Model Laid-Open No. 61-18968, Japanese Utility Model Laid-Open No. 1-152864).
However, although these measures can reduce the reversing impact at the time of reversing the wiper arm and the wiper blade, they have little effect in preventing chattering. .

On the other hand, in order to reduce the impact and the chattering phenomenon when the wiper arm and the wiper blade are turned over, a wiper having a structure in which a counterweight is provided at the tip of the wiper blade has been proposed (Japanese Patent Publication No. 60-566).
No. 58).

In the wiper disclosed in the above-mentioned publication, the counterweight provided at the tip of the wiper blade collides when the wiper arm and the wiper blade are reversed and moves in the direction opposite to the moving direction, whereby the vibration energy is absorbed. At the same time, a part of the energy of the wiper blade is dispersed to the counterweight, and further, the energy is absorbed by the friction generated in the supporting portion of the counterweight until the next reversal of the wiper arm and the wiper blade (counterweight collision). This is a configuration in which the chattering phenomenon is attenuated. Therefore, the reversal impact at the time of reversing the wiper arm and the wiper blade can be significantly reduced, and the chattering phenomenon can be reduced to some extent, which is very effective.

However, in the wiper disclosed in the above publication, in the supporting portion of the counterweight, until the force acting on the supporting portion exceeds the maximum static frictional force of the counterweight (the counterweight starts moving relative to the wiper blade). However, there is a drawback that energy cannot be absorbed by friction, and thus the chattering phenomenon cannot be attenuated.

Further, since the sliding portion and the rotating portion of the counterweight are indispensable in the wiper, dust and dirt are apt to adhere to this portion and wear is inevitable, so that the initial performance can be maintained for a long time. Was difficult to maintain.
Furthermore, there is a drawback that a collision noise of the counterweight is newly generated when the wiper arm and the wiper blade are turned over, and the counterweight provided at the tip of the wiper blade does not look good. was there.

[0011]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention is not limited to being able to reliably wipe off moisture and dust on the surface to be wiped, and also causes a reversal impact and a chattering phenomenon at the time of reversing the wiper arm and the wiper blade. It is an object of the present invention to obtain a vehicle wiper that can prevent the noise and can significantly reduce the noise.

[0012]

A vehicle wiper according to the present invention is a vehicle wiper including a wiper blade including a blade rubber and a plurality of holding levers for holding the blade rubber, and a wiper arm for holding the wiper blade. ,
It is characterized by comprising a damping unit fixed to at least a part of the plurality of holding levers and the wiper arm of the wiper blade, and in which a liquid or powder is enclosed so as to be able to flow while having a cavity inside.

[0013]

In the vehicle wiper having the above structure, the damping unit fixed to at least a part of the plurality of holding levers and the wiper arm moves together with the wiper blade and the wiper arm.

When a chattering phenomenon (self-excited vibration) occurs in the wiper blade and the wiper arm, the liquid or powder enclosed in the damping unit moves relatively in the direction opposite to the vibration direction, The vibration energy is absorbed by. This is the same when the wiper arm and the wiper blade are reversed, and the reverse impact is absorbed.

As described above, by providing the damping unit, it is possible to prevent the reverse impact and the chatter phenomenon from occurring when the wiper arm and the wiper blade are reversed.
Noise is significantly reduced.

Furthermore, since the liquid or powder enclosed in the damping unit relatively moves in the direction opposite to the vibration direction to absorb the vibration energy, there is no directionality of the vibration to be absorbed. It is possible to handle vibrations in all directions. Also, the vibration energy cannot be absorbed until the frictional force of the supporting portion of the counterweight exceeds the maximum static frictional force,
However, it is possible to respond regardless of the moving speed of the wiper arm and the wiper blade.

Further, since the damping unit has no part where dust or dirt adheres or wears, the initial performance can be maintained for a long period of time. Further, unlike the counterweight, a new collision noise does not occur when the wiper arm and the wiper blade are reversed. Also,
The fixed position of the damping unit can be set to a part that is difficult to see from the outside, and the appearance does not deteriorate.

As described above, not only the water and dust on the surface to be wiped can be reliably wiped, but also the reversing impact and the chattering phenomenon at the time of reversing the wiper arm and the wiper blade are prevented, and the noise during the wiping is greatly reduced. Can be reduced.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows an overall configuration diagram of a vehicle wiper 10 according to an embodiment of the present invention, and FIG.
A cross-sectional view of the wiper 10 along line 4 is shown.

The wiper arm 12 of the wiper 10 includes an arm head 14 fixed to a pivot shaft (not shown) of the vehicle body.
And an arm piece 16 that is connected to the arm head 14 and holds a wiper blade 20 described later, and a retainer 18 that connects the arm head 14 and the arm piece 16. A spring (not shown) is arranged between the arm head 14 and the arm piece 16 so as to apply a predetermined pressing force to the windshield glass (not shown) to the wiper blade 20.

On the other hand, the wiper blade 20 of the wiper 10
Is composed of a blade rubber 24 that contacts and wipes the windshield glass surface, and a plurality of holding levers that hold the blade rubber 24.

In this wiper blade 20, the primary lever 26 among the plurality of holding levers is the arm piece 16.
It is rotatably supported by a rivet 28 at the tip of the. Coupling portions 26A and 26B having a U-shaped cross section are formed at both ends of the primary lever 26, and the secondary levers 32 and 34 are rotatably supported by the rivet 30. This primary lever 26
One end of each of the secondary levers 32 and 34 connected to corresponds to both ends in the axial direction of the blade rubber 24, and holding portions 32A and 34A having a U-shaped cross section are formed. The holding portions 32A and 34A are blade rubber 2
Both ends in the axial direction of 4 are sandwiched and held together with the backing 36.

On the other hand, connecting portions 32B and 34B having a U-shaped cross section are formed at the other ends of the secondary levers 32 and 34, respectively, and the yoke levers 40 and 42 are rotatably supported by the rivet 38, respectively. ing.
Both ends of each of the yoke levers 40 and 42 correspond to an axially intermediate portion of the blade rubber 24, and the holding portions 40A and 40B and the holding portions 42A and 42 having a U-shaped cross section.
B are formed respectively. These holding portions 40A,
40B and the holding portions 42A and 42B are the blade rubber 24.
The intermediate portion in the axial direction of the above is sandwiched and held together with the backing 36. That is, the wiper blade 20
Is a primary lever 26, a secondary lever 32, 3,
4 and the yoke levers 40 and 42 form a so-called tournament type blade rubber holding structure.

Here, as shown in detail in FIGS. 1 and 2,
The damping unit 50 is fixed to the secondary lever 32 located on the tip side of the wiper blade 20.

The damping unit 50 has a structure in which a damping oil 54 is enclosed in a resin-made hermetic case 52 with a cavity 70 inside, and both side walls 37 of the secondary lever 32 having a U-shaped cross section. , 37 are integrally fixed to the inner side of the secondary lever 32 by the claw portions 33. As a result, the damping unit 50 always moves together with the secondary lever 32, that is, the wiper blade 20.

Next, the operation of this embodiment will be described. In the wiper 10 having the above structure, the damping unit 50 fixed to the secondary lever 32 moves together with the wiper blade 20 and the wiper arm 12.

When a chattering phenomenon (self-excited vibration) is about to occur in the wiper blade 20, the damping oil 54 enclosed in the sealed case 52 of the damping unit 50 is sealed in the opposite direction to the vibration direction. Within which the vibration energy of the wiper blade 20 is absorbed. This is the wiper arm 12
The same applies when the wiper blade 20 is reversed, and the reverse impact is absorbed.

As described above, since the wiper 10 is provided with the damping unit 50, the wiper arm 12 and the wiper blade 20 are reversed at the time of reversal impact and
The chattering phenomenon can be prevented and the noise during wiping can be significantly reduced.

Further, since the wiper 10 has a structure in which the vibration energy is absorbed by the damping oil 54 enclosed in the closed case 52 of the damping unit 50, there is no direction of the vibration to be absorbed, and vibrations in all directions. It is possible to correspond to. Further, since the damping oil 54 of the damping unit 50 always follows the movements of the wiper arm 12 and the wiper blade 20, "the vibration energy cannot be absorbed until the frictional force of the supporting portion of the counterweight exceeds the maximum static frictional force. It is possible to respond regardless of the moving speed of the wiper arm 12 and the wiper blade 20.

Further, the damping unit 50 has a construction in which damping oil 54 is enclosed, and since there is no part that adversely affects the vibration absorbing function due to dust or dirt adhering to or abrading, there is no initial performance. Can be maintained for a long time. Furthermore, like the counter weight, the wiper arm 12 and the wiper blade 20
No new collision sound is generated when the is reversed. Further, since the damping unit 50 is fixed inside the secondary lever 32, it is difficult to visually recognize it from the outside and the appearance does not deteriorate.

As described above, not only the water and dust of the windshield glass can be reliably wiped off, but also the reversal impact and the self-excited vibration, so-called chattering phenomenon, do not occur when the wiper arm 12 and the wiper blade 20 are reversed. , The noise is greatly reduced and it does not become an eyesore. Further, since the chattering phenomenon is prevented, it does not cause abnormal wear of the blade rubber 24 and deterioration of durability of the link portion for driving the wiper, and the power consumption of the wiper motor does not increase.

In the above embodiment, the damping unit 50 is attached to the secondary lever 32 located on the tip side.
However, the fixing position of the damping unit 50 and the number thereof are not limited to this.
These can be set appropriately.

For example, the damping unit 50 is fixed not only to the secondary lever 32 but also to the secondary lever 34 located on the rear end side, that is, the damping unit 50 is provided at each end of the wiper blade 20. Good. In this case, it is preferable to reduce the amount of damping oil 54 of the damping unit 50 fixed to the secondary lever 34 located on the rear end side to reduce the weight. That is, the peripheral speed of the damping unit 50 at the fixed position (the wiper blade 2
The damping effect is further improved by setting the amount of damping oil 54 or the shape of the damping unit 50 according to the moving speed of 0). Alternatively, the damping unit 50 may be fixed not only to the secondary levers 32 and 34 but also to other holding levers, for example, the primary lever 26 and the yoke levers 40 and 42, and may be attached to the wiper arm 12. Even in these cases,
When the wiper arm 12 and the wiper blade 20 are inverted, the inversion impact and the chattering phenomenon can be prevented, and the noise can be significantly reduced.

Further, in the above embodiment, the sealing case 52 of the damping unit 50 is made of resin, but the sealing case 52 may be made of other material, for example, metal. Further, although the damping oil 54 is sealed in the sealed case 52 of the damping unit 50, the sealed oil is not limited to this, and may be another liquid such as water or powder. It may be the body. Further, such damping oil 54 enclosed inside can more surely prevent the chattering phenomenon by appropriately setting its viscosity, specific gravity and the like corresponding to the self-excited vibration to be damped.

Further, in the above-described embodiment, the damping unit 50 is fixed by the claw portion 33 formed on the side wall of the secondary lever 32, but the fixing method of the damping unit 50 is not limited to this, and other methods. However, it is naturally applicable. For example, FIGS.
Like the damping unit 60 shown in FIG. 2, a locking claw 64 may be formed on the upper portion of the hermetically sealed case 62, and the locking claw 64 may be fitted and fixed in a locking hole 35 formed in the secondary lever 32. . Alternatively, a damping unit (sealed case) may be integrally provided on a part of the holding lever such as the secondary lever 32.

[0036]

As described above, the vehicle wiper according to the present invention is not limited to the ability to reliably wipe off water and dust on the surface to be wiped, but also causes the reverse impact and chatter phenomenon when the wiper arm and the wiper blade are inverted. It has an excellent effect that it is possible to significantly reduce the noise.

[Brief description of drawings]

FIG. 1 is a perspective view showing a damping unit provided on a secondary lever of a vehicle wiper according to an exemplary embodiment of the present invention.

FIG. 2 is a sectional view showing a fixed state of the damping unit shown in FIG.

FIG. 3 is an overall configuration diagram of a vehicle wiper according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3 showing a holding state of the blade rubber of the vehicle wiper according to the embodiment of the invention.

FIG. 5 is a view showing another fixed state of the damping unit.
It is a perspective view corresponding to.

6 is a sectional view corresponding to FIG. 2, showing a fixed state of the damping unit shown in FIG.

[Explanation of symbols]

 10 wiper 12 wiper arm 20 wiper blade 24 blade rubber 26 primary lever (holding lever) 32 secondary lever (holding lever) 34 secondary lever (holding lever) 40 yoke lever (holding lever) 42 yoke lever (holding lever) 50 damping unit 52 sealed Case 54 Damping oil 60 Damping unit 62 Sealed case

Claims (1)

[Claims] 1. A wiper for a vehicle comprising a wiper blade comprising a blade rubber and a plurality of holding levers for holding the blade rubber, and a wiper arm for holding the wiper blade, wherein a plurality of holding levers and wiper arms for the wiper blade are provided. A wiper for a vehicle, comprising a damping unit which is fixed to at least a part of the above and which is filled with a liquid or a powder so as to allow the liquid or the powder to flow therein.