JPH0112700B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intermittent wiper device for a vehicle, especially for high load,
The present invention relates to an intermittent wiper device suitable for use in light vehicles such as motorcycles with fairings that have relatively relaxed requirements such as high-speed operation and sudden braking.

Vehicles are equipped with so-called intermittent wipers that repeat one wiping operation at regular time intervals, especially when the amount of rainfall is low.

Generally, an intermittent wiper device, particularly a wiper device for a four-wheeled vehicle, etc., has an auto-stop switch having a c-contact built into the wiper motor, thereby intermittent driving of the wiper motor. On the other hand, wiper motors are required to rotate at high speeds in order to satisfy the wiping performance during high-speed driving, and are also required to have high torque performance sufficient to handle startup under high loads such as when freezing. A so-called overrun, in which the wiper stops beyond the stop position, tends to occur, and to prevent this, the above-mentioned c.
The contacts were used to perform sudden braking using dynamic braking.

Incidentally, in light vehicles such as motorcycles with fairings, the wiper mechanism can be configured to be relatively compact, and therefore, the wiper motor does not need to rotate as fast and have high torque performance as the four-wheeled vehicle, and does not require sudden braking.

Therefore, in this type of light vehicle, it is usually possible to stop the wiper motor by using an auto-stop switch having an a contact point without employing a means such as dynamic braking.

Conventionally, intermittent drive systems for wiper motors using such a contacts include relay contact drive systems,
Transistor methods are known, but the former has poor vibration and shock resistance and short contact life.As a result, the selection range is narrowed, and in addition to being prone to breakdowns and deterioration of characteristics, it is also expensive. , it has the disadvantage of increasing in size. Furthermore, in the latter case, an oscillation circuit is required, which complicates the circuit configuration, and also has the drawbacks of high cost and large size.

In order to eliminate these drawbacks, the present invention provides an intermittent wiper device for a vehicle that is inexpensive, lightweight, compact, and has a long service life by combining a switching means using a thyristor with an auto-stop switch having the above-mentioned contacts. The purpose is to provide.

In order to achieve such an object, the present invention is particularly applied to an intermittent wiper device for a light vehicle such as a motorcycle with a fairing, and is characterized by a wiper motor and a wiper motor connected in series to the wiper motor in an on state. a switching means using a thyristor that rotates; a delay circuit using, for example, a CR time constant circuit, which turns on the switching means after a predetermined period of time has elapsed from the time when the wiper motor stops; The automatic switching means is configured to be turned on by the rotation of the wiper motor, turn off the switching means, and turn off after, for example, one reciprocation of the wiper.

Hereinafter, preferred embodiments to which the present invention is applied will be described in detail with reference to the drawings.

FIG. 1 is an electrical system diagram of a vehicle showing a portion to which an intermittent wiper device according to the present invention is applied.

In the figure, 1 indicates a battery, the anode terminal of which is connected to one terminal of an ignition key 3 via a power fuse 2. The other terminal of this ignition key 3 is connected to an input terminal of a wiper motor 6 of a wiper motor unit 5 via a circuit fuse 4.
Furthermore, the other input terminals of the wiper motor 6 are connected to the earth line e via an automatic switching means 7. The wiper motor unit 5 is specifically illustrated in FIGS. 2 and 3 and will be described in detail later.

On the other hand, the cathode terminal of the battery 1 is connected to the earth line e, and the above configuration forms one loop circuit. Note that an ACG (alternating current generator) 8 for charging the battery 1 and a rectifying diode 9 connected in series thereto are connected between the ignition key 3 side terminal of the power supply fuse 2 and the earth line e.

On the other hand, the other input terminals of the wiper motor 6 on the automatic switching means 7 side are connected to the first fixed terminal 10a of the wiper switch 10 and the input side terminal 11a of the main circuit unit 11, respectively. The wiper switch 10 uses a three-contact switch, the second fixed terminal 10b is not connected, the third fixed terminal 10c is connected to the output side terminal 11b of the main circuit unit 11, and the movable terminal 10d is connected to the earth line e. Therefore, the first fixed terminal 10a is in normal mode, the second fixed terminal 10b is off, and the third fixed terminal 1 is in normal mode.
0c is an intermittent mode.

Further, the main circuit unit 11 is composed of a switching means 12 and a delay circuit 13, and this switching means 12 specifically includes a thyristor SCR ₁
The anode terminal is the input terminal 11.
a, and its cathode terminal is connected to the output terminal 11b.

On the other hand, when a voltage is applied to the input side terminal 11a, the delay circuit 13 is activated by a CR time constant circuit 14 configured with a resistor R ₁ and a capacitor C ₁ after a predetermined period of time has elapsed (that is, based on a time constant
After the terminal voltage of C ₁ reaches a predetermined value), turn on thyristor SCR ₂ , then turn on the thyristor
It has the function of turning on the SCR ₁ , and as mentioned above, the delay time from when voltage is applied to the input terminal 11a to turning on the thyristor SCR ₁ is determined by changing the time constant of the time constant circuit 14. It can be set arbitrarily, and in the example is approximately 4.5 seconds. On the other hand,
When no voltage is applied to the input terminal 11a, the capacitor _C1 is in a discharged state,
As a result, both thyristors SCR ₁ and SCR ₂ are in the off state.

Note that the diode D that constitutes the delay circuit 13 is for protection, the capacitor C ₂ and resistors R ₂ and R ₃ are for preventing malfunction, the resistors R ₄ and R ₅ are for voltage division, and the resistor R ₆ and capacitor C ₃ are for preventing malfunction. Each of these elements may be changed or added as desired in terms of design.

Next, the operation of the present intermittent wiper device having such a configuration will be explained with reference to FIGS. 1 and 2.

FIG. 2 specifically shows the structure of the wiper motor unit 5, and the same parts as in FIG. 1 are given the same reference numerals to clarify the structure.

First, when the ignition key 3 and the wiper switch 10 are both off (the state shown in FIG. 1), the automatic switching means 7 is also off as shown in FIG. That is, in FIG. 2, spur gear 1
Two contact portions 17 and 18 provided side by side are located in the cutout portion 16a of a C-shaped copper foil terminal 16 that is attached to the plane 15a of 5 with the rotating shaft 15b as the center. Contact portions 17 and 18 are electrically cut off. Note that the terminal 19 connected to the contact portion 18 and the terminal 20 connected to the wiper motor 6 are connected to the ground line e and the circuit fuse 4 in FIG. 1, respectively.

Next, turn on ignition key 3. As a result, the battery voltage is applied to the input terminal 11a of the main circuit unit 11, and the capacitor _C1 is charged, and the thyristor SCR ₂ is turned on, which is necessary for the thyristor SCR ₁ to also be turned on. Each gate voltage is applied,
Since the wiper switch is off, the circuit including the thyristor SCR ₁ is not energized, and as a result, the wiper motor 6 does not rotate.

Next, the wiper switch 10 is switched to the intermittent mode, that is, to the third fixed terminal 10c side. As a result, the circuit including the thyristor SCR ₁ is energized, and the wiper motor 6 rotates. In this case, the rotation of the wiper motor 6 is transmitted to the motor shaft 21, worm gear 22, and spur gear 15 as shown in FIG.
The direction of rotation is the direction of arrow B in the figure.

As a result, the spur gear 15 rotates in the direction of arrow B due to the rotation of the wiper motor 6, and the contact portions 17 and 18 are immediately connected by the action of the copper foil terminal 16.
That is, the automatic switching means 7 is turned on.
As a result, the input terminal 11a is grounded and the potential is zero, so the accumulated charge in the capacitor _C1 is discharged, the thyristors _SCR1 and _SCR2 are turned off, and the current of the wiper motor 6 is switched to the automatic switching means. The flow rotation continues through 7.

When the spur gear 15 rotates once and returns to its original position (the position shown in FIG. 2), the contacts 17 and 18 are disconnected, that is, the automatic switching means is turned off, and as a result, the rotation of the wiper motor 6 is stopped. do. Note that the wiper is configured to reciprocate once by a cam (not shown) or the like by one rotation of the spur gear 15.

Further, the rotation of the wiper motor 6 is stopped because both the switching means 12 and the automatic switching means 7 are turned off, and at the same time as the rotation is stopped, a battery voltage is applied to the input terminal 11a, and the CR time constant circuit ₁₄ is charged, and as described above, due to the function of the delay circuit 13, the switching means 12 is turned on after about 4.5 seconds (in the case of the embodiment), and the wiper motor 6 is rotated. As a result, as described above, the automatic switching means 7 is turned on, the switching means 12 is turned off, and after the wiper motor 6 rotates for a predetermined amount, the wiper motor 6 is stopped, and the above intermittent drive is repeated.

Note that in contrast to the above intermittent mode, the wiper switch 10 is set to the normal mode, that is, the first fixed terminal 10
When the switch is switched to a, a current always flows through the wiper motor 6, and the wiper is continuously driven.

FIG. 3 is a view in the direction of arrow A in FIG. 2, clearly showing the structure, and the same parts as in FIG. 2 are given the same reference numerals.

On the other hand, FIGS. 4 and 5 specifically show the main circuit unit 11 explained above as a printed wiring board 2.
FIG. 4 is a plan view and FIG. 5 is a side view. As explained at the outset, the conventional relay contact drive method or transistor method has the disadvantage that the printed wiring board 23 used therein is also increased in size due to the use of relay elements or oscillation circuits. The thyristor method does not use large parts,
In addition, the number of components is reduced, and in order to utilize a thyristor, as shown in FIG. The three lead wires 26 of the thyristor 26 are biased to the side.
The thyristor 2 is assembled by attaching and fixing the lead wire 26a and bending it in the direction in which the above-mentioned small parts are arranged.
If the circuit board 6 is laid horizontally so as to be superimposed on the above-mentioned small components, the space can be effectively utilized and the printed wiring board and further the main circuit unit can be miniaturized. In addition, 26b in the figure
(The shaded area in FIG. 4) is a heat sink provided in the thyristor 26.

In the embodiments described above, any changes in circuitry, shape, etc. may be made without departing from the gist of the present invention.

Therefore, as is clear from the above explanation, the main circuit unit used in the intermittent wiper device according to the present invention has the functions of setting the delay time and tightening the drive timing, and the other function is the function of setting the delay time and tightening the drive timing. The actuation and stopping of the wiping drive is handled by an automatic switching means having an a contact, and since this automatic switching means is a conventionally known auto stop switch, the additional parts required for the intermittent drive of the wiper are ultimately required by the main circuit unit. For example, unlike conventional systems in which an oscillation circuit is configured and all intermittent signals are supplied from the circuit unit, this main circuit unit can be made dramatically smaller by simplifying the circuit configuration and reducing the number of parts. Moreover, since a thyristor can be used, it is possible to further reduce the size by combining the mounting method on the printed wiring board.

As a result, it is possible to provide an intermittent wiper device having various features such as low cost, light weight, improved reliability, and long life.

[Brief explanation of drawings]

Fig. 1 is an electrical system diagram of a vehicle showing a part to which an intermittent wiper device according to the present invention is applied, Fig. 2 is a configuration diagram of a wiper motor unit, Fig. 3 is a view taken in the direction of arrow A in Fig. 2, and Fig. 4 5 is a plan view showing an example of mounting the main circuit unit on a printed wiring board, and FIG. 5 is a side view of the same. In the drawing, 5 is a wiper motor unit, 6 is a wiper motor, 7 is an automatic switching means, 11 is a main circuit unit, 12 is a switching means, 1
3 is a delay circuit, 14 is a time constant circuit, and SCR ₁ thyristor.

Claims (1)

[Scope of Claims] 1. A wiper motor, a switching means that is connected in series with the wiper motor and rotates the wiper motor in an on state, and a delay circuit that turns on the switching means after a predetermined period of time has elapsed since the wiper motor stopped. , characterized in that the automatic switching means is connected in parallel to the switching means and turns on when the wiper motor rotates, turns the switching means off, and turns off after the wiper motor rotates by a predetermined angle. Intermittent wiper device for vehicles. 2. The intermittent wiper device for a vehicle according to claim 1, wherein the switch means is constructed using a thyristor.