JPS5850897B2 - Waipakudo Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiper drive device used in vehicles and the like.

Conventional wiper drive devices for vehicles are equipped with an auto-stop mechanism, which turns the wiper switch OFF when the wiper is in use, no matter what position the wiper blade is in.
If you press F, the wiper blade automatically returns to the bottom edge of the windshield and stops.

FIG. 1 is a wiring diagram for explaining the auto-stop mechanism of a conventional wiper drive device, in which 1 is a battery, 2 is a wiper switch, and 3 is a wiper motor.

4 is an auto stop switch, 4 a s 4 b *
” is a contact point of the auto-stop switch 4, 5 is a wiper blade, and 5a, sb, 5c, and 5d are symbols indicating the position of the wiper blade 5.

FIG. 2 is a diagram showing the structure of an auto-stop switch 4 of a conventional wiper drive device, and 4d is a conductive plate rotated by a wiper motor.

FIG. 3 is a diagram for explaining the opening and closing of the contacts of the auto stop switch 4.

An auto-stop mechanism of a conventional wiper drive device with the above configuration will be explained below.

When the wiper switch 2 is OFF, the wiper switch 2, auto-stop switch 4, and wiper blade 5 are in the position shown by the solid line in FIG.

FIG. 2 shows the state of the auto-stop switch 4 at this time, with contacts 4a-4b closed and contacts 4a-4b closed.
-4c is open.

When the wiper switch 2 is turned on, the wiper motor 3 is supplied with power from the battery 1 through the diameter of the wiper switch 2 and begins to rotate.

The auto stop switch 4 is activated by the rotation of the wiper motor 3.
The conductor plate 4d rotates in the direction of arrow A in FIG. 2, and the wiper blade 5 reciprocates between position 5a and position 5d.

Suppose now that the wiper switch 2 is returned to the OFF state when the wiper blade 5 comes to the position 5d, at this time the auto stop switch 4 has contacts 4a-4b open and contacts 4a-4c closed, so the wiper motor 3 is energized by the battery 1 through the contacts 4c, 4a, and wiper switch 2, and continues to rotate.

When the wiper blade 5 comes from the position 5d to the position 5C, the contacts 4a to 4c are opened and the power supply to the wiper motor 3 is cut off.

However, due to inertia, the wiper motor 3 continues to rotate. When the wiper blade 5 reaches the position 5a, the contacts 4a-4b close, and the power terminal of the wiper motor 3 is short-circuited by the wiper switch 2 and the contacts 4a-4b, so the wiper motor 3 continues to rotate. 3, the electric brake is applied and the wiper blade 5 immediately stops at the position 5a.

The above is a description of the auto-stop mechanism of the conventional wiper drive device.

That is, when the wiper switch 2 is turned from ON to OFF at any position of the wiper blade 5, the wiper blade 5 returns to the stop position 5a and stops.

However, using such a conventional auto-stop switch has the following drawbacks.

That is, when the wiper is used while driving in the rain and the rain has stopped and the wiper switch is turned OFF, the wiper blade 5 will surely come down to position 5b due to the action of the auto-stop mechanism.

Ideally, the contacts 4a and 4b would open at this position 5b, cutting off the power supply to the wiper motor and lowering the wiper blade 5 by inertia to position 5a, but since the rain has already stopped, the wiper motor Since the friction between the blade 5 and the windshield is very strong, when the wiper blade 5 comes down to position 5b and the power to the motor 3 is cut off, the wiper blade 5 stops at position 5b due to the friction. There are many cases where this happens.

This position 5b is located several degrees higher than the lowest position 5a, so if the wiper blade 5 stops at this position, it not only significantly obstructs the driver's field of view, but also causes discomfort to the driver and causes the wiper blade to move in the side mirror. This often happens and is extremely dangerous.

The present invention is intended to solve the above-mentioned drawbacks, and by replacing the auto-stop switch with an electromagnetic relay and further adding a switch means for controlling the electromagnetic relay, the wiper blade can always be reliably stopped at the lowest end of the windshield. ,
The object of the present invention is to provide a wiper drive device that can ensure a comfortable and safe driving field of view for the driver.

The present invention will be described below with reference to embodiments shown in the drawings.

4 and 5, 1, 3, and 5 are equivalent to those shown in FIG. 1, 6 is a wiper switch, and T is a position detection switch means, which opens and closes in conjunction with the wiper blade 5, for example. Switches 7a and 7b are contacts of the switch 7, and 7c is a conductor plate that rotates in the direction of arrow B while being electrically connected to the contacts 7a and 7b.

FIG. 6 is a diagram showing the opening and closing of the switch 7 with respect to the position of the wiper blade 5.

The operation of the above-mentioned stealing will be explained.

Normally, when the wiper is not in use, the wiper switch 6 is set to O.
FF, switch 7 is OFF, contact 8a of relay 8 is in contact with contact 8b, wiper motor 3 is stopped, wiper blade 5 is in position 5a, and switch I is in the state shown in Fig. 5. .

When the wiper switch 6 is turned on, the coil of the relay 8 is energized and the contact 8a is connected to the contact 8C, so the wiper motor 3 rotates.

Due to the rotation of the motor, the wiper blade 5 moves to positions 5a and 5b.
The conductor plate IC rotates once per reciprocation.

Next, it is assumed that the wiper switch 6 is turned off when the wiper motor rotates three times and the wiper blade 5 is at the position 5d, for example.

At this time, switch 7 is ONL, so contacts 8a-8c of relay 8 remain connected.

Therefore, the wiper motor 3 continues to rotate, and the wiper blade 5
is lowered from position 5d towards position 5a.

When the wiper blade 5 comes to position 5a, the switch 7 is turned OFF.
F, the coil of relay 8 is de-energized and contact 8a separates from contact 8C and immediately comes into contact with contact 8b.

Then, both power supply terminals of the wiper motor 3 are short-circuited, and the wiper motor 3 immediately stops for dynamic braking.

That is, the wiper blade 5 is reliably stopped at the position 5a.

Next, FIG. 1 is a circuit diagram showing a second embodiment of the present invention, in which 9 is a wiper motor having a permanent magnet field and high-speed/low-speed switching terminals, 10 is a wiper switch, and 11 is a low-speed/high-speed switching relay. , 12 are diodes.

Other like symbols are the same as in the above embodiment.

The operation of the above-mentioned stealing will be explained.

When wiper switch 10 is OFF, switch 7, relay 8, and relay 11 are in the state shown in FIG. 7.

When wiper switch 10 is set to LOW, relay 8 is turned on.
, the motor rotates LOW, and the wiper switch 10 is set to H.
When set to IGH, relay 8 and relay 11 turn ONL, and the motor rotates at HIGH.

Regardless of whether the wiper switch 10 is LOW or HIGH, when the wiper switch 10 is turned OFF, it will surely stop at the stop position 5a as described in the first embodiment.

In these embodiments, the wiper blade can always be stopped at the lowest end of the windshield regardless of the magnitude of the frictional force between the wide blade and the windshield or the level of the power supply voltage, so the driving visibility can be maximized. , can provide safe driving and comfortable driving.

Furthermore, since an electric wire is used, the structure of the wiper switch is extremely simple, the number of wire harnesses on the wiper switch side is reduced, and the thickness can be 1/10 that of the conventional wiper switch.

Furthermore, since a conventional auto-stop switch can be used as the switch 7, a conventional wiper motor can be used without much modification.

As described above, in the present invention, the auto-stop mechanism is not only intercepted by a conventional cam switch, but is composed of an electric IEnlJ relay and a position detection switch means T for controlling the coil current of this electromagnetic IJ relay. The position detection switch means 7 may be of any type as long as it controls the energization state of the coil of the electric relay, so its current capacity is sufficient to allow the excitation current of the relay coil to flow, and it can be made extremely compact.

In addition, since the switching speed of the electromagnetic relay is extremely fast compared to conventional cam switches, it is possible to apply dynamic braking in an extremely short period of time after cutting off the power to the wiper motor with the electric IJ relay. This has the effect of improving the accuracy of the stopping position of the blade.

Also, when the wiper blade reaches the position where it should stop,
Since the coil of the electromagnetic relay is deenergized, no current flows through the coil while the wiper is stopped, so no power loss occurs.

Furthermore, since the wiper switch is configured to control the wiper motor current via an electromagnetic relay instead of passing the motor current directly through the wiper switch, the wiper switch can also be made extremely compact, which is a great advantage.

[Brief explanation of drawings]

Fig. 1 is an electrical wiring diagram of a conventional wiper drive device, Fig. 2 is a structural diagram of a conventional auto-stop switch, Fig. 3 is a time pattern diagram explaining the open/close states of the contacts of a conventional auto-stop switch, and Fig. 4 is a wiring diagram showing the first embodiment of the wiper drive device according to the present invention, FIG. 5 is a structural diagram of the switch 7 shown in FIG. 4, and FIG. 6 is a time pattern diagram for explaining the opening and closing of the switch 1. , FIG. 7 is an electrical wiring diagram showing a second embodiment of the device of the present invention. 3.9... Wiper motor, 5... Wiper blade, 6, 10... Wiper switch, T
・・・・・・Electromagnetic relay.

Claims (1)

[Claims] 1. A wiper motor driven by a command from a wiper switch is used, and when the wiper blade 5 driven by the wiper motor reaches a position where it should stop, the current flowing through the wiper motor is cut off and power is generated. In a wiper drive device equipped with an auto-stop mechanism that applies braking, the auto-stop mechanism includes an electric wire having a switching contact that controls the current flowing to the wiper motor, and a wiper drive device that operates according to a command of the wiper switch and a wiping position of the wiper blade. and position detection switch means 7 for controlling the current flowing through the electromagnetic IJ tray coil, and when the wiper blade 5 reaches a position where it should stop, the position detection switch means 1 turns off the coil of the electromagnetic relay. the wiper switch is energized, and the wiper switch is
A wiper drive device characterized in that the wiper motor current is controlled via a 1J relay.