JPH10203314A - Wiper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a wiper device capable of ensuring a wiping performance even when the pressing force of a wiper arm act slantingly to the central axis of a wiper blade. SOLUTION: An arm head 14 is twisted so that the axis of a hinge 20 is inclined by an angle α toward a minus side relative to the normal H of a glass surface G. Then, an arm piece 22 is twisted and returned in the direction opposite to the arm head 14. The central axis N of a wiper blade 30 is located on the normal H of the glass surface G. A power point K on which the pressing force P of a spring 28 acts through the arm piece 22 is offset by ΔL in the direction of width from the central axis N of the wiper blade 30 because of flanges of different thickness. Assuming that distance between the power point K and the end part 32A of a blade rubber 32 is L, this dislocation ΔL is a value determined by ΔL=L×tanα. Therefore, since the pressing force P of the wiper arm is directed toward the end part 32A of blade rubber 32, couple of force is not generated in the end part 32A. Thus, angle of contact for ensuring a wiping performance can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper device for wiping a window shield glass surface of a vehicle or the like.

[0002]

2. Description of the Related Art As shown in FIG.
In order to ensure wiping performance, the blade rubber 32 constituting the arm piece 22 held by the retainer 18 has
, An appropriate pressing force is applied by the spring 28.

In order to obtain good wiping performance over the entire wiping range in a state where the wiper is mounted on the vehicle, the center axis N of the wiper blade 30 and the normal H to the glass surface G (the curved glass surface It is necessary to adjust the inclination and the like of the pivot shaft 12 so that the angle (hereinafter, referred to as “attack angle”) with respect to a perpendicular line perpendicular to the tangent of the pivot shaft 12 becomes appropriate.

On the other hand, when the vehicle is running at a high speed, the wiper blade 30 is prevented from being lifted by the wind, as shown in FIG.
As shown in FIG. 0, the arm head 14 is twisted (the axis of the hinge shaft 20 is inclined at an angle α to the minus side with respect to the normal H of the glass surface G) to reduce the drag acting on the wiper blade 30. There is a torsion arm head that attempts to use the rubber 32 as a force for pressing against the glass surface G.

[0005] Here, when the wiper blade 30 advances from the set position (stop position) to the open position (the position where the wiper blade 30 is inverted) with respect to the normal line H of the glass surface G, it means that the wiper blade 30 is inclined to the minus side. In this case, it is referred to as falling on the opposite side to the traveling direction, and as falling on the traveling direction as the plus side.

However, when the hinge shaft 20 is tilted to the minus side as shown in FIGS. 9 and 10, the pressing force P of the spring 28 acts in a direction perpendicular to the hinge shaft 20, so that the wiper arm pushes the wiper blade 30 against the wiper blade 30. The acting direction of the pressure P is inclined with respect to the central axis N by the inclination of the hinge shaft 20 (angle α).

For this reason, the tip 3 of the blade rubber 32
2A, the arm piece 32 and the wiper blade 3
Assuming that the distance from the connecting portion (force point T) to 0 to the tip portion 32A is R, a couple of R sin α × P is generated. Due to this couple, when the wiper blade 30 moves in the direction of arrow A, the tip 32A of the blade rubber 32 falls too far, and when it moves in the direction of arrow B, the tip 32A of the blade rubber 32 rises too far. In either case, the optimum contact angle cannot be obtained, and the wiping performance is significantly reduced or chatter occurs.

[0008]

SUMMARY OF THE INVENTION In consideration of the above fact, the present invention obtains a contact angle for ensuring wiping performance even when the pressing force of the wiper arm acts obliquely with respect to the center axis of the wiper blade. An object of the present invention is to provide a wiper device that can perform the above-described operations.

[0009]

According to the first aspect of the present invention, a wiper arm is connected to an arm head fixed to a pivot shaft via a hinge shaft, and a wiper blade is attached to a tip end of the wiper arm. When the pivot shaft rotates, the wiper blade reciprocates with the wiper arm. Further, a pressing force is applied to the wiper arm in the direction of the glass surface perpendicular to the hinge axis by the urging means, and the wiper blade is pressed against the glass surface via the wiper arm.

Here, when the wiper blade advances from the set position (stop position) to the open position (the position where the wiper blade reverses), the case where the wiper blade falls to the opposite side to the advancing direction with respect to the normal to the glass surface is referred to as a minus side. And the case of falling in the traveling direction is referred to as a plus side.

In order to prevent the wiper blade from rising, the arm head is twisted so that the axis of the hinge shaft is inclined at a predetermined angle (α) to the minus side with respect to the glass surface. There is a device that utilizes the acting drag, more specifically, the component of the drag is used as the pressing force of the wiper arm.

In this case, since the pressing force is applied to the wiper arm in the direction of the glass surface perpendicular to the hinge axis by the urging means, the action direction of the pressing force on the wiper blade by the wiper arm is determined by the inclination angle (α) of the arm head. ) Is inclined with respect to the center axis of the wiper blade.

However, the wiper blade is connected to the tip of the wiper arm by the connecting means such that the direction of action of the pressing force of the arm head acts toward the tip of the wiper blade in contact with the glass surface. Even when the direction of action of the pressing force on the wiper blade by the wiper arm is inclined, no couple is generated at the tip of the wiper blade.

Therefore, in the reciprocating rotation of the wiper blade, a good wiping performance can be secured without changing the contact angle of the wiper blade with the glass surface due to couple.

According to the invention described in claim 2, according to claim 1
In the wiper device described in (1), the wiper blade is swingably supported at a tip end of the wiper arm via a connection means mounted on a connection shaft provided at a substantially central portion thereof.
The connecting means has a width-adjusting means, and the connecting position of the wiper arm to the connection shaft is offset laterally from the center axis of the wiper blade by the width-adjusting means, so that the force exerted by the wiper arm at the point of pressing force is exerted. The direction is directed to the tip of the wiper blade in contact with the glass surface.

As the width shifting means, the thickness of the side walls on both sides supporting the connecting shaft may be made different in size, a spacer may be interposed, and the thickness of the flange portion may be made different. The clip may be attached to the connection shaft.

The offset amount of the power point from the center axis of the wiper blade is L × tanα, where L is the distance between the power point and the tip of the wiper blade, and the offset direction is relative to the normal to the glass surface. This is the direction in which the hinge axis is inclined.

[0018]

1 and 2 show a wiper 10 for a vehicle using a wiper device according to the present embodiment. The wiper 10 has an arm head 14 fixed to a pivot shaft 12. A retainer 18 constituting the wiper arm 16 is rotatably connected to the arm head 14 via a hinge shaft 20. An arm piece 22 is fixed to the tip of the retainer 18.

A spring 28 extends between a pin 26 provided on the arm head 14 and a rear end of the arm piece 22. The spring 28 is always supported by the hinge shaft 20 as a fulcrum and together with the arm piece 22. The retainer 18 is urged in the direction of the glass surface G perpendicular to the hinge axis 20. At the tip of the arm piece 22, a hook portion 22A processed into a substantially U-shape is formed.

Here, in the wiper 10 of the present embodiment, the arm head 14 is twisted in order to prevent the wiper blade 30 from rising when the vehicle is running at a high speed, and as shown in FIG. The hinge shaft 20 is inclined at an angle α to the minus side with respect to the line H. It is to be noted that the inclination to the minus side means that when the wiper blade 30 advances from the set position (stop position) to the open position (the position where the wiper blade 30 is reversed), the wiper blade 30 advances with respect to the normal H of the glass surface G. It is referred to as leaning to the opposite side to the direction, and leaning to the plus side when falling in the traveling direction.

The arm piece 22 is twisted back in the direction opposite to the direction in which the arm head 14 is inclined, and the center axis N of the wiper blade 30 is above the normal H to the glass surface G. Therefore, the action direction of the pressing force P of the arm piece 22 is inclined by α with respect to the central axis N of the wiper blade 30.

The wiper blade 30 includes a blade rubber 32 for wiping the glass surface G, and a blade rubber 3.
2 are provided. A pair of side walls 36 and 38 are erected at predetermined intervals on the upper surface of the primary lever 34 at the top of the plurality of holding levers, and a clip 40 is fitted between the side walls 36 and 38. It is supposed to be.

As shown in FIG. 4 to FIG.
Has a leg 42 bent in a substantially U shape, and a bent portion of the leg 42 is formed with a cylindrical holding portion 43 which is partially cut away. The side wall 3 is
A pin 48 passing through 6, 38 is supported.

Further, two cuts 45 are formed in the leg 42, and the remaining portion is formed as an elastic piece 47 as a leg 4.
It overhangs from 2. On the lower surface of the elastic piece 47, a claw 49 is protruded. This claw 49 is used for the arm piece 2
When the second hook portion 22A is engaged with the leg 42, the hook portion 22A is locked by a locking hole 51 formed in the hook portion 22A.

On the other hand, at both ends of the leg 42, long plate-shaped flanges 44 and 46 having different thicknesses are integrally formed.
The hook portion 22A of the arm piece 22 is fitted between 4 and 46. As described above, by giving the flange portions 44 and 46 different thicknesses, the center line M between the inner walls of the flange portions 44 and 46 and the central axis N of the wiper blade 30 are shifted by ΔL in the width direction. That is, as shown in FIG. 3, the force point K of the pressing force P of the arm piece 22 attached between the flange portion 44 and the flange portion 46 is ΔΔ from the central axis N of the wiper blade 30.
L shift.

It should be noted that this deviation ΔL is represented by L, where L is the distance from the point of force K to the tip 32A of the blade rubber 32.
ΔL = L × tanα.

Next, the operation of the wiper blade mounting structure according to this embodiment will be described. As shown in FIG.
The arm head 14 is twisted so that 0 is inclined by the angle α with respect to the normal H of the glass surface G. Next, the cylindrical portion 42 of the clip 40 attached to the pin 48 of the primary lever 34
Is attached to the hook portion 22A of the arm piece 22. Then, the arm piece 22 is twisted back in the direction opposite to the tilt direction of the arm head 14, and the center axis N of the wiper blade 30 is Position on line H.

At this time, the force point K at which the pressing force P of the spring 28 acts via the arm piece 22 by the flange portions 44 and 46 having different thicknesses is offset from the center axis N of the wiper blade 30 by ΔL in the width direction. Let it.

When the distance from the point of force K to the tip 32A of the blade rubber 32 is L, ΔL =
It is a value determined by L × tanα. Therefore, the pressing force P of the wiper arm 16 is directed toward the tip 32A of the blade rubber 32, so that no couple is generated at the tip 32A. Therefore, in the reciprocating movement of the blade rubber 32, it is possible to obtain a contact angle for securing the wiping performance.

Referring now to FIGS. 11 and 12, the reason why a couple does not occur at the tip end portion 32A of the blade rubber 32 will be described in an easily understood manner.

As shown in FIG. 11, in the conventional type, a couple of P.times.sin.alpha..times.L is generated around the distal end portion 32A by the pressing force P acting on the force point K. As shown in FIG. However, FIG.
As shown in FIG. 2, by offsetting the power point K by ΔL (= L × tan α), the couple around the tip portion 32A becomes P ×
sin α × LP × cos α × ΔL.

Here, P × sin α × L = P × cos α
× ΔL, so that the couple around the distal end portion 32A eventually becomes zero.

The present invention can be similarly applied to a wiper structure in which the pivot shaft 12 is inclined and the hinge shaft 20 is inclined at an angle α with respect to the glass surface G as shown in FIG. Further, as a method of offsetting, the thickness of the flanges 44 and 46 of the clip 40 may be made constant, and the thickness of the side walls 36 and 38 may be made different.

However, since there are some wiper arms in which the arm head 14 is not twisted, it is more economical to make the side wall thickness of the wiper blade constant and change the clip so as to be compatible with a normal type wiper arm. It is. Further, if various types of clips having different flange thicknesses are manufactured, any type of wiper can be handled.

In this embodiment, the arm piece 22 is connected to the upper surface of the primary lever 34, that is, the so-called U
The hook type wiper has been described, but as shown in FIG.
A side-lock type wiper in which a pin 54 passing through 2 is supported by the arm piece 22 can also be used.

In this side lock type, the arm piece 22 supports the pin 54 via the spacer 56. However, by changing the size of the side wall 52 to be recessed toward the side wall 50, the offset amount is small. Even when the side lock portion overlaps the lever 34, a predetermined offset amount can be secured.

[0037]

According to the present invention, the contact angle for securing the wiping performance can be obtained even if the pressing force of the arm piece acts obliquely with respect to the center axis of the wiper blade.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing an arm portion of a wiper to which a wiper device according to an embodiment is applied.

FIG. 2 is an overall perspective view of a wiper to which the wiper device according to the embodiment is applied.

FIG. 3 is a structural exploded view for explaining the wiper device according to the present embodiment.

FIG. 4 is a perspective view showing a connection portion between an arm piece and a wiper blade.

FIG. 5 is a cross-sectional view showing a state where a clip is attached to an arm piece.

FIG. 6 is a plan sectional view showing a state in which a clip is attached to the wiper blade.

FIG. 7 is a structural exploded view for explaining another wiper device.

FIG. 8 is a plan sectional view showing a connection portion between a side lock type arm piece and a wiper blade.

FIG. 9 is a structural exploded view for comparing and explaining the operation with the wiper device according to the present embodiment.

FIG. 10 is a structural exploded view for comparing and explaining the operation with the wiper device according to the present embodiment.

FIG. 11 is a schematic view showing a conventional wiper device.

FIG. 12 is a schematic view showing a wiper device according to the present invention.

[Explanation of symbols]

 14 arm head 16 wiper arm 20 hinge shaft 28 spring (biasing means) 30 wiper blade 40 clip (width shifting means) 48 pin (connection means, connection shaft)

Claims (2)

[Claims] 1. An arm head fixed to a pivot shaft, a wiper arm connected to the arm head via a hinge shaft, and a biasing force for applying a pressing force to the wiper arm in a glass surface direction perpendicular to the hinge shaft. Means, a wiper blade attached to the tip of the wiper arm,
A wiper device in which the wiper arm is reciprocated and wipes the glass surface with a predetermined pressing force by the wiper blade; when the hinge shaft is set to be inclined with respect to the glass surface, the urging means Connecting means for connecting the wiper blade to the tip of the wiper arm is provided such that the direction of action of the pressing force of the wiper arm applied acts toward the tip of the wiper blade in contact with the glass surface. Wiper device. 2. The connecting means is mounted on a connecting shaft provided at a substantially central portion of the wiper blade so as to swingably support the wiper blade at the tip of the wiper arm, and connects the wiper arm to the connecting shaft. Width-adjusting means for offsetting a connection position laterally from a center axis of the wiper blade and directing a direction of action of a force at a force point of pressing by the wiper arm toward a tip end of the wiper blade in contact with the glass surface. The wiper device according to claim 1, wherein: