JPH05139255A - Wiper device - Google Patents

Abstract

PURPOSE:To prevent the reversing sound and rattling of a wiper blade by making the space between the connecting part of energizing mechanism and the support point of a retainer adjustable, and providing a pressing part for reducing this space only at the time of the viper blade reaching a reversing position. CONSTITUTION:A pair of pivots 3 are protrusively installed at a vehicle body 2, and a viper arm 4 is fitted to the pivots 3 to wipe windshield glass 1 by its reciprocating motion. When the wiper arm 4 reaches a reversing position, the guide roller 32 of a spring guide 24 gets on the lifter 33 of the vehicle body 2, so that the spring guide 24 pushes up the impulse pin 26 of support mechanism 25. Then the impulse pin 26 presses a spring 27 to move it upward, so that the distance between the connecting part R of the spring guide 24 to support mechanism 25 and the support point O of a retainer 10 is reduced. Pressing force is thereby reduced only at the reversing time to reduce the reversing sound of a wiper blade 19 and also to eliminate its rattling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper device, and more particularly to a wiper device for reducing noise generated when a wiper blade is wiped.

[0002]

2. Description of the Related Art A conventional wiper blade applies a pressing force to a window glass by a tension of a spring to secure a wiping property of the window glass and to increase a reversing sound when the wiper blade is reversed (stop position and reversal position). ing. This inverted sound is generated by the blade rubber 51 shown in FIG.
5 for holding the head 52 of the blade and the blade rubber 51
3 and then the head 52 of the blade rubber 51
It is caused by the collision of the shoulder 54 with the shoulder 54.
In general, the size of the reversal sound is larger in the latter case.

Therefore, for the purpose of reducing the reversing sound of the wiper blade, the material and shape of the blade rubber 51 are changed so that the head 52 and the shoulder 5 of the blade rubber 51 are changed.
Proposals have been made to mitigate the collision with No. 4 (Actual Kaisho 6
0-115159). However, blade rubber 5
Since the sectional shape of No. 1 has an optimum shape and the material (hardness) is naturally limited, it is difficult to expect the blade rubber 51 itself to reduce the reversal sound. That is, even if the cross-sectional shape or material of the blade rubber 51 is changed to reduce the collision between the head portion 52 and the shoulder 54 of the blade rubber 51, the collision energy due to the collision that cannot be reduced is accumulated in the blade rubber 51. .. This collision energy is transmitted to the lip portion 56 via the neck portion 55 of the blade rubber 51.
Transmitted to. Therefore, the attitude of the blade rubber 51 with respect to the window glass 57 becomes unstable, and the wiping property is adversely affected.

Therefore, a wiper device disclosed in Japanese Utility Model Laid-Open No. 2-511163 has been proposed. In this wiper device, when the wiper blade reaches the stop position and the reverse position, the guide roller rides on the blade lifter,
The wiper arm is raised. With this configuration, the wiper blade is separated from the window glass 57 only when the wiper blade is reversed, and the reversal sound of the wiper blade during the reversal can be reduced.

[0005]

However, when the wiper blade is reversed, the wiper arm and the wiper blade are levitated by the blade lifter via the guide rollers, so that the wiper arm is rattled or the wiper blade is swung. There is a problem that an abutting noise is generated when the blade rubber of (1) is in contact with the blade glass in a state of being separated from the window glass 57.

The present invention has been made to solve the above problems, and its purpose is to reduce the reversing sound of the wiper blade and prevent rattling and contact noise of the wiper blade and the blade rubber. The purpose of the present invention is to provide a wiper device.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a head arm attached to a pivot shaft of a vehicle body with a retainer provided with a wiper blade, which is brought into contact with or separated from a windshield of the vehicle body. In a wiper device that rotatably supports the head arm and connects the retainer and the head arm by an urging mechanism to apply a pressing force to the wiper blade, an urging mechanism is applied to the head arm via a supporting mechanism. When the wiper blade reaches a reversal position due to the rotation of the pivot shaft, the distance between the connecting portion of the biasing mechanism connected to the supporting mechanism and the supporting point of the retainer can be adjusted, and the biasing mechanism is adjusted. The gist of the present invention is to provide the vehicle body with a pressing portion that presses to bring the connecting portion closer to the support point.

[0008]

With the rotation of the pivot shaft, the wiper blade performs the wiping operation via the head arm and the retainer. Then, when the wiper blade reaches the reverse position, the biasing mechanism is pressed by the pressing portion of the vehicle body. Then, the distance between the connecting portion of the urging mechanism connected to the supporting mechanism and the supporting point becomes small, and the pressing force of the wiper blade becomes small. Therefore, the reversing sound of the wiper blade at the time of reversing becomes small. Further, since the pressing portion only reduces the distance between the connecting portion and the supporting point, the retainer does not rotate in the direction in which it comes in contact with or separate from the windshield, and the wiper blade does not come in contact with or separate from the windshield.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment in which the present invention is embodied in a vehicle wiper device will be described below with reference to FIGS.

As shown in FIG. 1, a pair of pivot shafts 3 connected to a drive unit (not shown) project from a vehicle body 2 below the windshield 1. A wiper arm 4 is attached to the pair of pivot shafts 3. When the pivot shaft 3 is reciprocally rotated by the drive of the driving device, the wiper arm 4 reciprocates to wipe the window glass 1.

Next, the structure of the pair of wiper arms 4 will be described in detail. Since the pair of wiper arms 4 have the same configuration, only the configuration of one wiper arm 4 will be described, and the other wiper arm 4 will be denoted by the same reference numeral and detailed description thereof will be omitted.

As shown in FIGS. 1 to 3, 5 and 6, a head arm 5 of a wiper arm 4 is attached to the pivot shaft 3.
Is inserted, and the pivot shaft 3 is provided on the upper part of the head arm 5.
The male screw part 3a of is projected. A nut 6 is screwed into the male screw portion 3a to fix the head arm 5 to the pivot shaft 3 by tightening. The head arm 5 is formed with an extending portion 8 extending in the horizontal direction via an inclined portion 7 extending obliquely upward. The extending portion 8 is formed with a rectangular accommodating portion 9 whose lower surface is open.

A base end of a retainer 10 is rotatably supported on the tip of the extending portion 8. That is, the extending portion 8
Support shafts 11 are inserted at both ends in the width direction at the tip of
Both ends of the support shaft 11 project laterally from the extending portion 8.
The retainer 1 is attached to both ends of the support shaft 11 protruding sideways.
A pair of engaging pieces 12 formed to project at the base end of 0 are connected. Therefore, the retainer 10 can be rotated with the support shaft 11 as the support point O and can be brought into contact with or separated from the window glass 1.

The retainer 10 has a U-shaped cross section whose lower part is open, and the inside thereof is a disposing portion 13.
Further, the retainer 10 is formed so as to taper toward the tip. A screw 1 is provided on the upper surface of the tip of the retainer 10.
A through hole 15 through which 4 is inserted is formed. The base end of the arm piece 16 is connected to the tip of the retainer 10. In other words, the screw 14 that is inserted through the through hole 15 of the retainer 10 is screwed into the female screw hole 17 formed at the base end of the arm piece 16, whereby the arm piece 1
6 is attached to the retainer 10.

A lever 20 of a wiper blade 19 is swingably provided at the tip of the arm piece 16 via a clip 18. A blade rubber 21 is supported on the lever 20. Therefore, the windshield 1 is wiped by the blade rubber 21.

Further, an engaging hole 22 is provided in the base end portion of the arm piece 16, and the retainer 10 is provided in the engaging hole 22.
One end of the tension spring 23, which constitutes the biasing mechanism disposed in the disposing portion 13, is hooked. The other end of the tension spring 23 is hooked to a spring guide 24 that constitutes a bending biasing mechanism, and the spring guide 24 is supported by a head mechanism 5 via a support mechanism 25.
Is linked to. Further, a connecting portion between the spring guide 24 and the support mechanism 25 is a connecting portion R. With this configuration, the tension of the tension spring 23 causes the retainer 1
0, the arm piece 16 and the wiper blade 19 are urged toward the windshield 1 around the support point O. Therefore, the windshield 1 and the wiper blade 1
9 is pressed by a predetermined pressing force P.

The support mechanism 25 comprises a sliding pin 26, a spring 27 and a nut 28. A circular flange portion 29 that supports the spring 27 is formed at the lower end of the sliding pin 26, and the spring guide 24 is hooked on the back surface of the flange portion 29 to hold the hook portion 3.
0 is formed. A male screw portion 26a with which the nut 28 is screwed is formed on the upper end of the sliding pin 26. Therefore, with the spring 27 interposed in the sliding pin 26, the extension 8 of the head arm 5 is extended from the storage portion 9 side.
It is inserted into the insertion hole 31 formed in the. Then, a nut 28 is screwed into the male screw portion 26a protruding from the upper surface of the head arm 5.

Therefore, the sliding pin 26 is always urged downward by the urging force of the spring 27 via the flange portion 29, so that the nut 28 is engaged with the extending portion 8 of the head arm 5. There is. Therefore, the distance X between the connecting portion R and the supporting point O is the largest.
Further, the spring guide 24 is bent toward the vehicle body 2, and a guide roller 32 is rotatably provided at the bent portion. The guide roller 32 is separated from the window glass 1 with a slight gap. And
When the guide roller 32 of the spring guide 24 is pressed upward from below against the urging force of the spring 27,
The sliding pin 26 of the support mechanism 25 is adapted to move upward. At this time, the distance interval X between the connecting portion R and the supporting point O is reduced.

Further, as shown in FIGS. 4 and 6, the wiper blade 1 is attached to the vehicle body 2 in the vicinity of the pivot shaft 3.
A lifter 33 is provided on which the guide roller 32 rides when 9 reaches the reverse position. The contact surface 33a of the lifter 33 as a pressing portion on which the guide roller 32 rides up is formed in an inclined shape. And lifter 3
Since the spring 27 is pressed from below when the guide roller 32 rides on the spring 3, the sliding pin 26 moves to the spring 2
It is designed to move upward while compressing 7. At this time, the distance interval X between the connecting portion R and the support point O becomes short.

When the pivot shaft 3 is reciprocally rotated by a driving device (not shown), the pair of wiper arms 4 reciprocate to wipe the window glass 1. Further, when the pair of wiper arms 4 reach the reverse position, the guide roller 32 of the spring guide 24 causes the lifter 33 of the vehicle body 2 to move.
Get on. Therefore, the spring guide 24 presses the sliding pin 26 from below, so that the sliding pin 26 moves upward while compressing the spring 27. As a result, the distance interval X between the connecting portion R and the supporting point O becomes short.

Here, the pressing force P of the wiper blade 19
Can be calculated by the following equation.

[0022]

[Equation 1]

Therefore, when the wiper blade 19 is inverted, the pressing force P of the wiper blade 19 can be reduced by the amount that the distance X between the connecting portion R and the support point O is reduced. As a result, since the pressing force P can be reduced only when the wiper blade 19 is reversed, the reversing sound of the wiper blade 19 can be reduced.

When the wiper blade 19 starts to return from the reverse position toward the stop position, the guide roller 32
Comes down from the contact surface 33a of the lifter 33. Therefore, the sliding pin 26 moves downward due to the biasing force of the spring 27, and the nut 28 of the sliding pin 26 engages with the extending portion 8 of the head arm 5. Then, since the distance X between the connecting portion R and the supporting point O becomes large, the pressing force P becomes large and the wiper blade 19 can surely wipe the windshield 1.

Further, since only the other end of the tension spring 23 and the sliding pin 26 are moved by the lifter 33 at the time of reversing, the wiper arm 4 is rotated and the wiper blade 19 is separated from the windshield 1 unlike the conventional case. There is nothing to do. As a result, the wiper blade 19
Rattling and contact noise when touching the windshield 1,
It is possible to prevent rattling and rotation noise due to the rotation of the wiper arm 4.

Further, as the spring 27 provided on the sliding pin 26, one that can expand and contract with a light force can be used. Further, the pressing force P of the wiper blade 19 at the time of reversing can be adjusted with a simple structure.

In this embodiment, the wiper blade 1
The guide roller 32 rides on the lifter 33 when 9 reaches the reverse position.
Guide roller 32 when lifter 3 reaches the stop position.
It is also possible to provide the main body 2 so that 3 can be mounted on the main body 2.

Further, as shown in FIG. 7, a pair of support mechanisms 25 are provided for the head arm 5, and the pair of support mechanisms 2 are provided.
It is also possible to interpose the guide roller 32 between the five.

Further, although the present embodiment is embodied as a vehicle, it can be used for all vehicles equipped with a wiper device.

[0030]

As described above in detail, according to the present invention, it is possible to reduce the reverse sound of the wiper blade and prevent rattling of the wiper blade and the blade rubber.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a state in which a wiper arm of a wiper device according to the present invention is provided on a main body.

FIG. 2 is a partially cutaway sectional view showing a configuration of a wiper arm.

FIG. 3 is a partially enlarged sectional view showing a structure for applying a pressing force to a wiper blade of a wiper arm.

FIG. 4 is a partially enlarged sectional view showing a state in which a guide roller rides on a lifter and a sliding pin moves upward.

FIG. 5 is a plan view of a wiper arm.

FIG. 6 is a partially cutaway perspective view showing a lifter provided on a base end portion of a wiper arm and a main body.

FIG. 7 is a partially enlarged cross-sectional view showing another example of the support mechanism.

FIG. 8 is a side view showing the shape of a blade rubber.

[Explanation of symbols]

1 ... Wind glass, 2 ... Vehicle body, 3 ... Pivot shaft,
5 ... Head arm, 10 ... Retainer, 19 ... Wiper blade, 23 ... Tension spring as biasing mechanism, 24
... Spring guide as biasing mechanism, 25 ... Support mechanism, 33 ... Lifter as pressing portion, O ... Support, R ... Connection portion, X ... Distance interval

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiraki Yuki, 390 Umeda, Kosai City, Shizuoka Prefecture, Asmo Co., Ltd. (72) Inventor, Kitomi Iguchi, 390 Umeda, Kosai City, Shizuoka Prefecture, Asmo Co., Ltd. (72) Invention Koji Saito 390 Umeda, Kosai City, Shizuoka Prefecture Asmo Co., Ltd.

Claims (1)

[Claims] 1. A retainer having a wiper blade attached to a head arm attached to a pivot shaft of a vehicle body is rotatably supported in a direction in which the windshield of the vehicle body comes in and out of contact with the retainer and the head arm. In a wiper device for connecting a pressure-applying force to the wiper blade by connecting an urging mechanism to the head arm via a supporting mechanism, the urging mechanism is supported by the supporting mechanism. The distance between the connecting portion and the supporting point of the retainer with respect to the head arm can be adjusted, and when the wiper blade reaches the reversal position by the rotation of the pivot shaft, the biasing mechanism is pressed to connect the connecting portion and the supporting point. A wiper device characterized in that a pressing portion for reducing the distance interval is provided on the vehicle body.