JPS62221954A - Electric windshield wiper for vehicle - Google Patents

Abstract

PURPOSE:To tilt an edge part in the forward direction of a wiper blade without fail irrespective of the travel speed of a vehicle, by changing a tilt angle of the wiper blade to a glass surface separately in each case of outgoing and returning movements, and holding it rotatably to a wiper arm. CONSTITUTION:A wiper blade 4 is supported on a wiper arm 5 so as to cause its tilt angle to a windshield surface 2 differ in each case of outgoing and returning movements via a rotary supporting mechanism 20 so as to make the specified angle rotatable. Therefore, when the wiper blade 4 reciprocatively travels, there is produced frictional force between an edge part 7 of blade rubber 3 and the glass surface, whereby the rotary supporting mechanism 20 is turned round up to one side of rotation end points, and the wiper blade 4 is tilted to the forward direction side, thus the edge part 7 is tilted in the forward direction of the wiper blade 4. Therefore, an unwiped part and a chattering phenomenon due to air pressure to be produced at the time of car running are preventable.

Description

[Detailed Description of the Invention] [8 Fields of Industrial Application] The present invention secures visibility for vehicle occupants by wiping off rainwater, snow, mud, dust, etc. adhering to glass surfaces such as the windshield and rear glass of a vehicle. Regarding small dual-purpose wipers.

[Prior Art] A vehicle wiper consists of a wiper blade, a wiper arm, a motor, and 11 links connecting these.By driving the motor, the wiper blade reciprocates along the glass surface of the vehicle. Conventionally, the wiper blade was supported so as to be in contact with the glass surface substantially perpendicularly at any position in the wiper pattern.

On the other hand, a wiper blade consists of a blade rubber that comes in contact with the glass surface, a backing that supports the rubber, a combination of several levers, and a clip that attaches to the wiper arm. , tilting in the direction of wiper blade travel. At this time, the contact angle between the edge and the glass surface is 30° to 50°.
If the contact angle is too high or too low, it will impede good wiping and cause wiping residue or chattering.

[Problems to be Solved by the Invention] Conventionally, the wiper blade was supported so as to contact the glass surface perpendicularly, so when the wiper blade moves toward the opposite side of the vehicle's traveling direction when the vehicle is traveling at high speed, However, when the blade rubber is subjected to strong wind pressure generated when the vehicle is running, the edge portion is prevented from tilting as the wiper blade advances, resulting in problems such as unwiped residue and chatter when the vehicle is running at high speeds.

The present invention has been made in view of the above circumstances.
The second objective is to provide a wiper for a vehicle whose edge portion is reliably inclined in the advancing direction of the wiper blade regardless of the traveling speed of the vehicle.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a wiper arm that performs reciprocating rotational motion with one end as a fulcrum, and a wiper that is supported by the other end of the wiper arm and wipes a glass surface. In the vehicle wiper, the wiper blade is rotatable relative to the wiper arm by a predetermined angle such that the angle of inclination with respect to the glass surface is different between the forward movement and the backward movement. The technical means is that it is supported via a support mechanism.

[Function] As described above, in the present invention, when the wiper blade moves in one direction, a frictional force is generated between the edge of the blade rubber and the glass surface, so the rotation support mechanism moves in one direction due to this frictional force. The wiper blade is rotated to the end point of rotation to tilt the wiper blade in the direction of travel of the wiper blade, and the edge portion is tilted in the direction of travel of the wiper blade.

Also, when the wiper blade moves to the other side, the frictional force generated between the edge of the blade rubber and the glass surface causes the rotation support mechanism to rotate to the end point of the other rotation, allowing the wiper blade to move forward. The edge portion is tilted in the direction in which the wiper blade moves.

As a result, the edge portion of the blade rubber is always inclined in the advancing direction of the wiper blade.

[Effects of the Invention] According to the present invention, since the edge portion of the blade rubber can always be inclined in the direction of movement of the wiper blade regardless of the vehicle running speed, it is possible to prevent wiping residue and chatter caused by wind pressure that occurs when the vehicle is running. can.

[Embodiment 1] Next, a vehicle wiper of the present invention will be described based on an embodiment shown in the drawings.

FIG. 3 shows a vehicle wiper to which the first embodiment of the present invention is applied. This vehicle wiper 1 wipes off rainwater, snow, mud, dust, etc. adhering to the glass surface of a windshield 2 of a vehicle to ensure the visibility of the vehicle driver, and is a wiper that brings a blade rubber 3 into contact with the glass surface. blade 4
and a wiper arm 5 that presses and supports this wiper blade 4 against the glass surface, drives this wiper arm 5, and moves the wiper blade 4 back and forth at a slight angle along the glass surface of the windshield 2. It is broadly divided into wiper shaft 6.

As shown in FIGS. 4 and 5, the blade rubber 3 has an edge portion 7 that comes into contact with the glass surface, and the edge portion 7 has a structure such that the direction of inclination of the edge portion 7 can be easily reversed when the direction of movement of the wiper blade 4 is reversed. Supporting neck part 8 and edge part 7
and a lip portion 9 that adjusts the contact angle with the glass surface. The blade rubber 3 also has a backing 10 of a leaf spring to be attached to the wiper blade 4 and to evenly press the blade rubber 3 against the glass surface.
A bagging attachment 11 is formed for attaching the bagging.

This backing 10 includes a yoke 12 that presses the blade rubber 3 against the glass surface and distributes pressure, and a secondary
It is supported by a lever set 15 consisting of a lever 13 and a primary lever 14. And this lever set 15 is
The lever assembly 15 is attached to the wiper arm 5 via a clip 16 for attaching it to the wiper arm 5. These, the wiper blade 4 from the blade rubber 3, backing 10, lever set 15 and clip 16
is configured.

The clip 16 of the wiper blade 4 is attached to the arm piece 17 of the wiper arm 5. This arm piece 17 is connected to the wiper shaft 6 via a retainer 18.
It is supported by a 7-mesh head 19 which is fixed to the. The retainer 18 is rotatably supported by the arm head 19, and includes a tension coil spring (not shown) that pulls the arm piece 11 and the arm head 19 and presses the arm piece 17 against the glass surface. has been done. The wiper arm 5 is constituted by the arm piece 17, the retainer 18, the arm head 19, the tension coil spring, and the like.

The wiper shaft 6 is a wiper motor (not shown).
The wiper shaft 6 is connected to a link mechanism (not shown) that converts the rotational motion of The blade 4 reciprocates along the glass surface of the windshield 2.

Next, the clip 16 provided with the rotation support mechanism 20 of the present invention will be explained using FIGS. 1 and 2.

The clip 16 has a cylindrical rotation support part 21 at its end, and a fixing part 23 that is attached to the end of the arm piece 17 of the wiper arm 5 with a screw 22. The rotation support portion 21 of the fixed portion 23 includes a primary lever 1
A rotating portion 25 of the lever support portion 24 supporting the lever 4 is rotatably fitted onto the outside. A circumferentially long elongated hole 26 is formed in the rotating portion 25 so as to face the center of the rotating portion 25 . In addition, a pin hole 27 is formed in the rotation support part 21 and passes through the center of its diameter.
After the FIJ portion 25 is attached, a pin 28 is press-fitted and fixed so as to cover the pin hole 27 with the elongated hole 26.

This prevents the rotating part 25 from moving in the direction of the rotation support part 21, and the rotation angle θ of the rotating part 25 is regulated by the length of the elongated hole 26. And this rotating part 25
One end point of rotation supports the primary lever 14 so that the wiper blade 4 contacts the glass surface perpendicularly, as shown by the solid line in FIG. As shown by the broken line in Fig. 2, the wiper blade 4
The primary lever 14 is supported so that it is inclined with respect to the glass surface in a direction opposite to the traveling direction of the vehicle (the right side shown in FIG. 2).

Further, a torsion coil spring 29 is provided on the outer periphery of the rotation support portion 21.
is fitted externally. One end of the torsion spring 29 is locked to a locking pin 30 provided on the rotation support part 21,
The other end is locked in a spring locking hole (not shown) installed in the lever support part 24, and the spring force constantly urges the lever support part 24 in the six directions of the arrows in FIG.

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

The wiper blade 4 moves in the opposite direction to the direction of travel of the vehicle (right side in the figure)! ff1 (upward stroke) will be explained using FIG. 4.

When the blade rubber 3 slides on the glass surface, a frictional force Fj Fj acts between the glass surface and the edge portion 7.

This frictional force F is caused by the torsion coil spring 29
4 in the six directions of the arrows in FIG. rotate,
The lever support portion 24 is inclined by an angle θ in a direction opposite to the vehicle traveling direction.

As a result, the center line B of the wiper blade 4 (see Fig. 4) is inclined at an angle θ with respect to the perpendicular line C of the glass surface, forcing the edge portion 7 of the blade rubber 3 to move in the opposite direction of the vehicle traveling direction. Tilt.

For this reason, even if the blade rubber 3 receives wind pressure generated when the vehicle is running, the edge portion 7 is forcibly tilted in the opposite direction to the vehicle traveling direction. This prevents the edge portion 7 from tilting in the direction opposite to the advancing direction of the wiper blade 4 due to wind pressure, and prevents unwiped residue and chattering due to wind pressure.

A state in which the wiper blade 4 moves in the direction of travel of the vehicle (
(downward stroke) will be explained using FIG.

When the blade rubber 3 moves once on the glass surface, a frictional force F acts between the glass surface and the edge portion 7, similar to the above-mentioned upward stroke. This I! j The frictional force F coincides with the direction in which the torsion coil spring 29 urges the lever support portion 24 in the direction of the arrow in FIG. As a result, the lever support part 24 rotates in the direction of the arrow in FIG. 2, and the lever support part 24 supports the wiper blade 4 perpendicularly to the glass surface. At this time, the edge portion 7 of the blade rubber 3 is caused by the frictional force F generated between the glass surface and the edge portion 7 and the wind pressure generated when the vehicle is running.
Ensure that the vehicle is tilted in the direction of travel.

Thereby, the edge portion 7 can be reliably inclined in the vehicle traveling direction even in the downward stroke, so that it is possible to prevent unwiped portions and chattering phenomena.

The torsion coil spring 29 facilitates the reversal of the wiper blade 4 when the wiper blade 4 changes from the upstroke to the downstroke, and attenuates the shock generated at the time of reversal.
Opposition? It reduces the sound.

FIG. 6 shows a second embodiment of the invention. In addition, in the figures, the same reference numerals as in the above embodiment indicate the same functional parts.

In the above embodiment, an example was shown in which the rotation support mechanism 20 was provided on the clip 16 that connects the wiper blade 4 and the wiper arm 5. However, the rotation support mechanism 20 of this embodiment is It is set in. The arm piece 17 includes a first arm 31 connected to the retainer 18;
and a second arm 32 to which the wiper blade 4 is connected. A rotation support portion 34 having a cylindrical hole 33 inside is fixed to the end of the first arm 31 . Also,
The end of the second arm 32 is fitted into the hole 33 of the rotation support part 34, and the cylindrical rotation part 3 is rotatably supported by the hole 33.
5 is provided. The rotation range of the rotation portion 35 is restricted by the elongated hole 26 and the pin 28.

Further, a torsion coil spring 29 is provided on the outer periphery of the second arm 32.
is fitted externally. This torsion coil spring 29 has one end locked to a locking member 36 provided on the rotation support part 34,
The other end is locked to a locking member 31 provided on the second arm 32. This torsion coil spring 29 always biases the second arm 32 in the direction of arrow E in FIG. 6 by its spring force.

A third embodiment of the present invention is shown in FIGS. 7 to 12. In addition, in the figures, the same reference numerals as in the above embodiment indicate the same functional parts.

The rotation support mechanism 20 of this embodiment is provided at the intermediate portion of the arm head 19. The arm head 19 includes a first head 38 connected to the wiper shaft 6 and a retainer 1.
8 and a second head 39 connected to the second head 39.

A rounded protrusion 40 is formed at the end of the first head 38, and this protrusion 40 fits into a cylindrical hole 41 formed at the end of the second head 39. Supports rotatably. This rotation range is regulated by the elongated hole 26 and the pin 28, as shown in FIG.

The sliding surface 42 between the first head 38 and the second head 39.
43, as shown in FIGS. 9 and 10, a semi-cylindrical shape 44.45 is formed correspondingly.
4.45 is l! I! It is provided long in the sliding direction of the moving surfaces 42 and 43. A compression coil spring 46 is mounted in this groove 44, 45, and the compression coil spring 46 always urges the second head 39 in the direction of arrow F in FIG. 7 by its spring force. When the wiper blade 4 performs an upward stroke, the compression coil spring 46 is compressed as shown in FIG. 11 due to the frictional force that acts when the rubber plate slides on the glass surface, and the sliding surfaces 42 and 43 are move the first head 38
and second head 39 are rotated in the opposite direction of arrow F by a rotation angle θ (see FIG. 12) determined by elongated hole 26 and pin 28. Further, when the wiper blade 4 performs a downward stroke, it rotates in the direction of arrow F due to the friction force f5 between the rubber plate and the glass surface and the biasing force of the compression coil spring 46.

[Brief explanation of drawings]

Fig. 1 is a top view of the clip, Fig. 2 is a sectional view showing how the rotating support part and the rotating part are attached, and Fig. 3 is a perspective view of a vehicle wiper to which the first embodiment is applied. Figures 4 and 5
6 is a top view of the wiper arm showing the second embodiment of the rotary support structure a, and FIG.
The figure is a side cross-sectional view of a wiper arm showing the third embodiment of the rotation support mechanism, FIG. 8 is a top view showing the joint portion of the first head and the second head, and FIGS. 9 to 11 are the first head. FIG. 12 is a sectional view showing a groove and a compression coil spring provided at the joining portion of the wiper blade and the second head, and FIG. 12 is an explanatory view showing the rotating state of the first head and the second head during the upward stroke of the wiper blade. In the figure 2...Front glass 3...Blade rubber 4...Wiper blade 5...Wiper arm 20...Rotation support mechanism 29...Torsion coil spring 46...Compression coil spring

Claims (1)

[Scope of Claims] 1) A vehicle wiper comprising a wiper arm that performs reciprocating rotational motion with one end as a fulcrum, and a wiper blade supported by the other end of the wiper arm and wipes a glass surface, wherein the wiper blade comprises: , for the wiper arm so that the angle of inclination with respect to the glass surface is different between forward movement and backward movement,
A wiper for a vehicle, characterized in that it is supported via a rotation support mechanism so as to be rotatable through a predetermined angle. 2) The vehicle wiper according to claim 1, wherein the rotation support mechanism includes a spring that always urges the wiper blade to tilt in the vehicle traveling direction. 3) The vehicle wiper according to claim 1 or 2, wherein the rotation support mechanism is provided at a connecting portion between the wiper arm and the wiper blade. 4) The vehicle wiper according to claim 1 or 2, wherein the rotation support mechanism is provided at an intermediate position of the wiper arm.