JPH0367755A - Wiper device - Google Patents

Abstract

PURPOSE:To enlarge the wiping area of a wiper during operation at a low speed by providing an adjusting means by which when operation of the wiper arm at high speed is detected the distance from a pivot shaft to one end portion of a link member is made longer than during operation at low speed. CONSTITUTION:A wiper arm 2 comprises an arm head 5 fixed at its end portion 5a to a pivot shaft 1 and a pair of pivot arms 10 extending from the pivot shaft 1 and connected together by a bar-shaped connecting member 11. In this case, one end portion 13a of a link member 13 is connected to one of the pivot arms 10 via an oscillating member 12 serving as means for adjustment. The oscillating member 12 comprises a shape memory alloy 12b and a heater 12a stuck to each other and is oscillated, as indicated by the two-point dotted line, by heating of the shape memory alloy 12b by means of the heater 12a. The distance L from the pivot shaft 1 to one end portion 13a of the link member 13 is extended by DELTAL by transmitting electricity to the heater 12a when the wiper is operated at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a wiper device used in automobiles, ships, etc., and particularly relates to a wiper device that has approximately the same wiping range during high-speed operation and low-speed operation. It is something.

[Prior Art] As a conventional wiper device, for example, the wiper device shown in FIG. 4 and FIG.
There is something like the one shown in the figure. This wiper device
As shown in the figure, a wiper arm 2 is attached to a pivot shaft 1, and a wiper blade 4 for wiping the surface of a window panel 3 is attached to this wiper arm 2.

Specifically, the wiper arm 2 has an arm head 5.
It has a retainer 6 and an arm piece 7. A base end 5a of the arm head 5 is fixed to the pivot shaft 1, and a base end 6a of a retainer 6 is connected to the window panel 3 via a swing shaft 8 to a distal end 5b of the arm head 5. It is mounted so that it can swing in a plane perpendicular to the surface.

A tension spring (not shown) is disposed between the arm head 5 and the arm piece 7. This tension spring allows the wiper blade 4 to be pressed against the window panel 3 with a predetermined pressing force.

Further, the pivot shaft 1 is rotated by the driving force of a wiper motor (not shown), so that the wiper arm 2 is driven within a predetermined range to wipe a predetermined range of the window panel 3.

In addition, as for this kind of thing, for example, Utility Model Application No. 58-35
There is one such as that described in Publication No. 446.

[Problems to be Solved by the Invention] However, such conventional wiper devices perform high-speed operation (the number of wiper operations is approximately 72 times/minute) and low-speed operation (the number of wiper operations is approximately 48 times/minute). However, due to this difference in speed, the inertial force during reversal is greater during high-speed operation than during low-speed operation, so the wiping range becomes larger than during low-speed operation. For this reason, since the wiping range is set based on the high-speed operation so that the wiper blade 4 does not come into contact with the side moldings of the window panel 3, the wiping range during low-speed operation becomes smaller. There is a problem in that the wiping performance during low-speed operation is not good.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned conventional problems, in which the base end of the wiper arm is fixed to a pivot shaft,
A pivot arm extends from the pivot shaft, and one end of a link member extending from a wiper motor is rotatably attached to the pivot arm, and when driven by the wiper motor, the pivot arm is moved through the link member. A wiper device that rotates a wiper arm to swing the wiper arm and wipes a window panel surface with a wiper blade attached to the tip of the wiper arm, the wiper device comprising: a detection means for detecting a high-speed operation state of the wiper arm; The wiper device is characterized in that it is provided with an adjusting means for making the distance from the pivot shaft to one end of the link member longer during high-speed operation than during low-speed operation based on a signal from the detection means.

[Operation] According to this means, in order to wipe the window panel surface, when the wiper motor is driven, the pivot arm and the pivot shaft are rotated via the link member, the wiper arm is swung, and the wiper blade is rotated. The window panel surface is wiped away.

When the wiping operation is set to high speed operation, this state is detected by the detection means, and based on this signal, the distance from the pivot shaft to one end of the link member is set by the adjustment means to be longer than when the wiping operation is at low speed. Then, during this high-speed operation, the swing angle of the pivot arm becomes smaller than during low-speed operation.

Therefore, even if the inertial force at the time of reversal is large during high-speed operation, the wiping range during low-speed and high-speed operations can be set to be approximately the same. As a result, there is no need to narrow the wiping range during low-speed operation as in the conventional case, and the wiping range can be secured during both operations.

[Example code] The present invention will be explained below based on one embodiment.

FIGS. 1 to 3(a) and 3(b) are diagrams showing one embodiment of the present invention.

First, to explain the groove bottom, as shown in FIG. 1, this wiper device has a wiper arm 2 attached to a pivot shaft 1l11, and a wiper blade 4 for wiping the window panel 3 surface attached to this wiper arm 2. There is.

Specifically, the wiper arm 2 has an arm head 5.
It has a retainer 6 and an arm piece 7. The arm head 5 has a base end 5a fixed to the pivot shaft 1, and a retainer 60 base end 6a is attached to the distal end 5b of the arm head 5 with respect to the window panel 3 via the swing shaft 8. It is mounted so that it can swing in a vertical plane.

Further, a tension spring (not shown) is disposed between the rear end 7a of the arm piece 7 and the arm head 5. This tension spring allows the wiper blade 4 to be pressed against the window panel 3 with a predetermined pressing force.

Furthermore, as shown in FIG.
They are connected by 1. And one pivot arm 1
0 is connected to one end 13a of a link member 13 via a swinging member 12 serving as an adjusting means. This swinging member 12 has a shape memory alloy 12b and a heater 12a bonded together, and the shape memory alloy 12b is activated by the heater 12a.
When heated, it is set to swing as shown by the two-dot chain line in FIG. By swinging in this manner, the distance from the pivot shaft 1 to the one end 13a of the link member 13 extends from L to ΔL, which is indicated by the solid line.

The heater 12a of this swinging member 12 is arranged in an electric circuit as shown in FIG. That is, code 1 in the figure
5 is a battery, 16 is a control unit, 17 is a wiper switch, one terminal of the heater 12a is connected to the positive side of the battery 15, and the other terminal is one terminal of a normally open contact 18a of a relay 18 serving as a detection means. The other terminal of this contact 18a is grounded. Furthermore, the excitation coil 18b of this relay 18 is connected to the H terminal of the wiper switch 17 and the wiper motor 14.
It is arranged between one terminal of wiper switch 1
7, when the switch is rHIGHJ (during high-speed operation), terminals I, H, and E are conductive, and when it is rLOW (
(during low speed operation), the terminal is closed.

I and E are made conductive. The terminal wire is connected to the terminal 2 of the wiper motor 14, the terminal wire is connected to the control unit 16, and the terminal E is grounded.

Next, the operation of the wiper device having such a configuration will be explained.

When the wiper switch 17 is set to rLOWj, for example, terminals I and E are made conductive, so that
Electric current is supplied from the battery 15 to the wiper motor 14 via the control unit 18, and the wiper motor 14 is driven at a predetermined speed. Then, as the swing lever 14a rotates, one pivot arm 10 swings via the link member 13. At the same time, the other pivot arm 10 is also swung via the connecting member 11, and the wiper blade 4
Three window panels will be wiped away.

In this case, as shown in FIG. 3(a), the rotation radius of the wiper motor 14 (the rotation radius of the link member lower end portion 13b)
is R, and one end 1 of the link member 13 from the pivot shaft 1
If the distance to 3a is L, the swing angle of the pivot arm 10 is θL.

On the other hand, when rHIGHJ of the wiper switch 17 is selected, terminals I, H, and E are conductive, and the battery 15
A current is supplied from the wiper motor 14 to the wiper motor 14 via the control unit 16, and the current flows from the terminal 1 of the wiper motor 14 to the terminal H of the wiper switch 17. Then, a current is supplied to the excitation coil 18b of the relay 18, thereby closing the normally open contact 18a, and current flows to the heater 12a. When this heater 12a rises to a predetermined temperature, the shape memory alloy 12b of the swinging member 12 is deformed as shown by the two-dot chain line in FIG. One end 1 of
3a also changes its position as shown by the two-dot chain line in FIG. As a result, the distance from the pivot shaft 1 to the one end 13a of the link member 13 becomes L+ΔL. Then, the third
As shown in Figure (b), the distance increases,
The rotation angle θH of the pivot arm 10 becomes smaller. Therefore, during high-speed operation, even if the inertial force at the time of reversal is greater than during low-speed operation, the rotation angle θH of the pivot arm 10 is smaller, so that the wiping range by the wiper blade 4 is different from that during high-speed operation and low-speed operation. It hardly changes over time.

As a result, there is no need to reduce the wiping range during low-speed operation as in the past, and the wiping performance can be improved compared to the past.

In addition, in the above embodiment, the heater 12a is used as the adjustment means.
and shape memory alloy 12b, but are not limited to this.
It is also possible to change the position of one end of the link member using a motor, solenoid, or the like.

[Effects of the Invention] As described above, according to the present invention, there is provided a detection means for detecting the high-speed operation state of the wiper arm, and a signal from the detection means to remove one end of the link member from the pivot shaft during high-speed operation. By providing an adjustment means that makes the distance to the wiper blade longer than during low-speed operation, the wiping range of the wiper blade can be set to be approximately the same during high-speed operation and low-speed operation, so the wiping range during low-speed operation is expanded compared to conventional wiper blades. It has the practical effect of being able to do the following.

[Brief explanation of drawings]

1 to 3 are diagrams showing one embodiment of the wiper device of the present invention, and FIG. 1 is a schematic diagram of the same wiper device, and FIG.
The figure is an electrical circuit diagram of the wiper device, Figure 3 (a),
(b) is an explanatory diagram showing the effects during high-speed operation and low-speed operation, respectively, FIG. 4 is a perspective view of the wiper device, and FIG. 5 is an explanatory diagram showing the wiping range of a conventional window panel. l... Pivot shaft 2... Wiper arm 3... Window panel 4... Wiper blade lO... Pivot arm 12... Swinging member (adjustment means) 13... Link member 13a...・One end portion 14...Wiper motor 18...Relay (detection means)

Claims (1)

[Claims] The base end of the wiper arm is fixed to a pivot shaft, the pivot arm extends from the pivot shaft, and one end of a link member extending from the wiper motor to the pivot arm is rotatable. When the wiper motor is driven, the pivot arm is rotated via the link member to swing the wiper arm, and the wiper blade attached to the tip of the wiper arm wipes the window panel surface. In the wiper device, a detection means for detecting a high-speed operation state of the wiper arm, and an adjustment means for making the distance from the pivot shaft to one end of the link member longer during high-speed operation than during low-speed operation based on a signal from the detection means. A wiper device characterized by being provided with.