JPH0386654A - Wiper device - Google Patents

Abstract

PURPOSE:To suppress the generation of uncomfortable noise on the reversal in the wiping process by interposing an error angle varying mechanism which is installed in turnable manners on a supporting member fixed to a car body, between a link mechanism and a wiper arm. CONSTITUTION:A first pivot shaft 3 which is supported in turnable manners on a supporting member 2 fixed to a car body is rotated in reciprocation by the reciprocating angular motion of a segment arm 11, and the reciprocating rotary movement is transmitted to a second pivot shaft 4. A wiper arm installed at the other edge of the pivot shaft 4 is angularly moved in reciprocation. The reciprocating rotary movement of the shaft 3 is transmitted to a gear 8, and an angle adjusting screw 6 is moved vertically. A bearing member 5 is raised and lowered in the AA' direction around a pin 13, and the shaft 4 is rising/lowering-turned. Therefore, the error angle can be reduced at all the positions in the wiping process by setting the tilt angle of the pivot shaft 4 to zero to the position corresponding to the error angle of zero, and the noise generated on reversal can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wiper device for wiping glass windows of vehicles such as automobiles.

[Conventional technology]

Conventionally, in this type of wiper device, the turning motion of the crankshaft, which is the output shaft of the wiper motor unit, is converted into a reciprocating rotational (angular) motion by a link mechanism, and the wiper blade 21 is moved to point A as shown in FIG. A reciprocating wiping motion is performed over the angle α between points -B.

On the other hand, the angle θ between the normal line of the window glass (windshield) 22 and the center line of the wiper blade 21 is called the error angle, and this is because the windshield of a vehicle usually has a three-dimensional curved shape. Therefore, as shown in FIGS. 6(1) and (2), it changes depending on the wiping position (position of the wiper blade). Here, the error angle θ is defined as positive (+) when the apex of the blade is tilted in the same direction as the advancing direction of the wiper blade (direction of arrow C in FIGS. 5 and 6), and (=) when the opposite direction is tilted.

The error angle θ is normally determined when the wiper blade 21
When performing a reciprocating wiping motion between points A and B in the figure, the blade changes as shown in FIG. 7. That is, when the error angle θ=0,
The wiper blade 21 and the windshield 22 are at right angles [see Fig. 6 (1)], and the forward wiping stroke (between point B and point A)
Then, the error angle θ is positive in the first half [see Figure 6 (2)].

In the second half, the error angle θ becomes negative, and conversely, in the wipe return process (between point A → point B), the error angle θ becomes negative in the first half.
is negative, and the error angle θ is positive in the second half. This is to reduce the resistance caused by friction when the wiper blade 21 is reversed, thereby making it easier to reverse the wiper blade 21.

[Problems to be Solved by the Invention] As mentioned above, when reversing in the wiping process 9, for example, at point A in FIG. 5, the error angle is designed to take the angle -θ1 shown in FIG. Due to the frictional resistance between the rubber blade (blade rubber) 23 and the glass surface, the state shown in FIG. 8 occurs at the moment of reversal. For this reason, the part of the rubber blade 23 indicated by the arrow in FIG. 9 may come into contact with the wiper blade 21 at the moment when it starts moving after reversing. This tendency becomes more pronounced as the rubber blade 23 gets older, causing noise ( This had the inconvenience of generating unpleasant noises.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wiper device that can overcome the disadvantages of the conventional wiper device and, in particular, can effectively reduce the generation of unpleasant noise during reversal of the wiping stroke.

[Means to solve the problem]

The present invention has a structure in which the turning motion of the crankshaft of the wiper motor unit is converted into a reciprocating angular motion by a link mechanism, thereby causing a wiper blade mounted on a wiper arm to perform a reciprocating wiping motion. Among these, an error angle variable mechanism is interposed between the link mechanism and the wiper arm. The variable error angle mechanism is connected to a first pivot shaft that is rotatably mounted on a support member fixed to the vehicle body and whose one end is connected to the link mechanism, and the other end of the first pivot shaft. a second pivot shaft which is connected at one end to be tiltable and capable of transmitting rotational force, and whose other end is connected to the wiper arm; The structure includes a supporting bearing member, and a motion conversion mechanism that converts the rotational movement of the first pivot shaft into an up-and-down rotational movement of the bearing member. This aims to achieve the above-mentioned purpose.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

This embodiment is a wiper device having a structure in which a turning motion of a crankshaft of a wiper motor unit (not shown) is converted into a reciprocating angular motion by a link mechanism, thereby causing a wiper blade installed on a wiper arm (not shown) to perform a reciprocating wiping motion.

Among these, an error angle variable mechanism is interposed between the link mechanism and the wiper arm.

FIG. 1 shows the configuration of this variable error angle mechanism. That is, this error angle variable mechanism 1 includes a support member 2 made of a plate-like member, and a segment arm rotatably mounted on the support member 2 and whose one end (lower end in FIG. 1) controls a part of the link mechanism. 11, and one end (lower end in FIG. 1) of the first pivot shaft 3 is connected to the first pivot shaft 3 and has one end (lower end in FIG. connected,
A second pivot shaft 4 whose other end (upper end in FIG. 1) is connected to the wiper arm, and a bearing member 5 which is supported by the support member 2 so as to be rotatable up and down and which pivotally supports the second pivot shaft 4. It is equipped with

To explain this in more detail, the support member 2 is actually used while being fixed near the cowl of a vehicle (not shown), and is erected opposite to the plate-like portion 2a and near the center of the plate-like portion 2a. A rising portion 2b provided (see FIGS. 3 and 4),
I will warn you from 2c. A bearing 2d is provided in the center of the plate-shaped portion 2a, and the first pivot shaft 3 described above is mounted on this bearing 2d.

The first pivot shaft 3 has a hollow large diameter portion 3a formed at one end (the upper end in FIG. 1) and a rod-shaped small diameter portion 3b formed at the other end. At the open end of the large diameter portion 3a, there is a U
A pair of letter-shaped notches 3c.

3c (see FIG. 4), and after inserting the small diameter portion 3b into the bearing 2d from above as shown in FIG.
A drive gear 7, which is integrally fixed to the segment arm 11, is press-fitted into the other end (lower end in FIG. 1). In FIG. 1, reference numeral 12.12 indicates a pin for preventing falling off.

The second pivot shaft 4 has a bearing member 5 at its center.
A pair of pin-shaped protrusions 4a are provided at one end of the pin-shaped protrusions corresponding to the notches 3c, 3c.

4a, and a wiper arm (not shown) is screwed to the other end. In FIG. 1, reference numeral 4b indicates unevenness for preventing rotation of the wiper arm. The bearing member 5 equipped with this second pivot shaft 4 is
As shown in FIG. 3, the rising portions 2b, 2c
It is pivoted so that it can be rotated up and down. At this time, the pin-like protrusions 4a, 4a of the second pivot shaft 4 are engaged with the U-shaped notches 3c, 3c of the first pivot shaft 3 described above.

A screw hole 2e for an angle adjustment screw is formed in the plate-shaped portion 2a of the support member 2 at a position to the left of the center in FIG. An angle adjustment screw 6 having a male threaded portion formed in the center is screwed into this screw hole 2e. After screwing into the plate-shaped portion 2a, one end of the angle adjustment screw 6 (lower end in FIG. 1) has a
A driven gear 8 that meshes with the aforementioned drive gear 7 is press-fitted.

Also, at the other end of this angle adjustment screw (upper end in Figure 1),
A spherical locking portion 6a that fits into a spherical locking means 9 provided on the bearing member 5 is provided. That is, the spherical locking means 9 and the spherical locking portion 6a create a kind of universal locking mechanism.
A joint is formed. Therefore, in this embodiment, the drive gear 7 is rotated around the first pivot shaft 3.
When the driven gear 8 rotates clockwise (or counterclockwise) when viewed from the top of the figure, the driven gear 8 rotates counterclockwise (or clockwise), and as a result, the angle adjustment screw rotates upward through the screw hole 2e ( or downward). As a result, the bearing member 5 rotates up and down around the pins 13, 13. That is, in this embodiment, the drive gear 7
, driven gear 8. A movement that converts the rotational movement of the first pivot shaft 3 into an up-and-down rotational movement of the bearing member 5 by the screw hole 2e, the angle adjustment screw 6, and the universal joint consisting of the spherical locking means 9 and the spherical locking part 6a. A conversion mechanism 10 is configured.

FIG. 2 shows an exploded view of the variable error angle mechanism 1. As shown in FIG.

Next, the overall operation of the above embodiment will be explained.

The turning motion of a crankshaft of a wiper motor unit (not shown) is converted into a reciprocating angular motion of the segment arm 11 via a link mechanism, and this reciprocating angular motion of the segment arm 11 causes the first pivot shaft 3 to perform a reciprocating rotational motion. This reciprocating rotational motion of the first pivot shaft 3 is transmitted to the second pivot shaft 4, and the wiper arm installed at the other end of the second pivot shaft 4 moves at the above-mentioned angle around the second pivot shaft 4. A reciprocating angular movement is performed within the α range, whereby the wiper blade attached to the wiper arm performs a reciprocating wiping movement.

At this time, the drive gear 7 is simultaneously connected to the first pivot shaft 3.
This reciprocating rotational movement is transmitted to the driven gear 8, and the angle adjustment screw moves up and down integrally with the driven gear 8. As a result, the bearing member 5
．． The second pivot shaft 4 performs a reciprocating rotational movement (up-and-down rotation movement) in the directions of arrows A and A' in FIG. In this case, since the second pivot shaft 4 is allowed to rotate with respect to the bearing member 5, as a result, while the wiper blade makes a reciprocating angular movement,
The error angle θ changes depending on the position.

Therefore, the error angle θ=O shown in FIG.
By setting the inclination of the second pivot shaft 4 to be zero (0) at the position corresponding to , the error angle can be made smaller (closer to 0) at all positions in the wiping stroke. It is possible.

Therefore, it is possible to effectively reduce the generation of noise (unpleasant noise) that occurs during reversal during the wiping process, which has been a problem in the past.

〔Effect of the invention〕

Since the present invention is configured and functions as described above, according to this, the rotational motion of the first pivot shaft is converted into the up-and-down rotational motion of the bearing member by the action of the motion conversion mechanism that constitutes the variable error angle mechanism. Because you can
When converting the turning motion of the crankshaft of the wiper motor unit into reciprocating angular motion using a link mechanism and causing the wiper blade installed on the wiper arm to perform reciprocating wiping motion, the normal line of the windshield (windshield glass) surface and the wiper blade are It is possible to optimize the error angle by bringing the angle between the center line of the It is possible to provide a wiper device that is unprecedented and excellent in that it can effectively reduce the generation of unpleasant noise.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the configuration of the main parts of an embodiment of the present invention, FIG. 2 is an exploded view of FIG. 1, FIG. 3 is an external perspective view of FIG. 1, and FIG. 4 is a diagram of FIG. 1. Figures 5 to 9 are explanatory diagrams showing the conventional example, and Figure 5 shows the wiping angle movement of the wiper blade on the windshield. Explanatory diagram showing the range of Figure 6 (1), (
2) is an explanatory diagram showing an example of an error angle, FIG. 7 is a diagram showing a change in error angle with respect to the blade wiping position, and FIGS. 8 to 9 are diagrams for explaining disadvantages in the conventional example. 1...Error angle variable mechanism, 2...
・Support member, 3...first pivot shaft,
4...Second pivot shaft, 5...
・Bearing member, 10...Motion conversion mechanism, 11...
...Segment arm that controls part of the link mechanism.

Claims (1)

[Claims] (1) In a wiper device having a structure in which a turning motion of a crankshaft of a wiper motor unit is converted into a reciprocating angular motion by a link mechanism to cause a wiper blade installed on a wiper arm to perform a reciprocating wiping motion, the link mechanism and the wiper arm are connected to each other. A variable error angle mechanism is interposed between the first pivot shaft and the first pivot shaft, which is rotatably mounted on a support member fixed to the vehicle body and whose one end is connected to the link mechanism; a second pivot shaft having one end connected to the other end of the first pivot shaft so as to be tiltable and capable of transmitting rotational force, and the other end connected to the wiper arm; and a motion conversion mechanism that converts rotational movement of the first pivot shaft into an up-and-down rotational movement of the bearing member. wiper device.