JPS5915730Y2 - wiper drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiper drive device that causes a wiper to perform a wiping motion by switching the rotational direction of the motor itself.

Conventional wiper drive devices rotate the wiper motor in only one direction and transmit the rotational motion to the blade via a link mechanism to perform a wiping motion.

However, it has been difficult to use the motor and link mechanism to perform the wiping motion of the blade at an expanded angle of 180 degrees or the like.

Furthermore, if the wiping movement is performed at such a wide angle, the link mechanism etc. will become very complicated, which may easily cause a malfunction.

The purpose of the present invention is to solve the above problems.

An example of implementing the present invention will be described below with reference to the drawings.

As shown in Figures 1 to 3, the shaft of the wiper motor 1 (
A worm 2 is provided within a case 3 (not shown), and a worm wheel 4 that meshes with the worm 2 is provided on a rotatable shaft 5 within the case 3.

The shaft 5 protrudes outside the case 3, and a wiper arm 6 is fixed to the tip thereof.

The case 3 is formed into a cylindrical shape with one end open, and the open end is closed by a disk-shaped lid 7 fixed to the case 3.

A rivet-shaped pivot 8 is inserted into a hole 7a drilled in the center of the iron lid 7, and the pivot 8 has a lever plate 9 on the back of the lid 7 and a point plate 10 on the front of the lid 7, respectively. It is rotatably supported.

Furthermore, fan-shaped windows 11 and 12 are formed in the lid 7 at positions substantially facing each other with the pivot support 8 in between.

A pin 13 is provided at the free end of the lever plate 9 through a window 11.
The pin 13 is fixed so as to protrude from the worm wheel 4, and the pin 13 can engage with two opposing protrusions 14 and 14' protruding from the worm wheel 4.

A protrusion 15 is provided at the free end of the point plate 10, and both ends of an elastic body 16 such as a spring are respectively engaged with the protrusion 15 and the tip of the pin 13.

Further, a fan-shaped plate 17 is fixed to the lid 7 on the back side of the window 12, and as shown in FIG. Five contacts are arranged in order on the same circumference: contacts 19 and 21 connected to the side (1) and contact 20 connected to the side (2) of the power source.

On the other hand, on the back side of the point plate 10, two electrode plates 23 and 24 are arranged side by side on the same circumference, and contact points 18, 19, 20, 21, 22 on the plate 17 and both electrode plates 23 and 23, 24 forms a selector switch,
By rotating the point plate 10 to the right and left, the contacts 18, 19, 20, 21, 22 and electrode play) 2
The contact position with 3.24 changes and the direction of power supply to the motor 1 is changed to rotate the motor 1 in forward and reverse directions.

Rotation of the point plate 10 is restricted by stoppers 25 protruding from both sides of the window 12.

Further, the window 12 is not necessarily necessary, and the contacts 18, 19.
20.21.22 can also be provided on the lid 7, furthermore electrode plates 23.24 and contacts 18.21. 19.20.
21.22 are reversed from the above example to make contacts 1, 8.19.
．． 20.21.22 to the point plate 10, and
Electrode plates 23,24 can also be provided on plate 17.

Note that the protrusions 14 and 14' can also be provided on a new rotating body that is separate from the worm wheel 4 in the case 3, for example, that is attached to the shaft 5 separately from the wheel 4.

Next, the operation of switching the rotational direction of the motor in this device will be explained.

First, when the motor 1 is powered on, the electrode plates 23 and 24 close the contacts 18 and 19 and the contacts 20 and 21, respectively, and the motor 1 Since a current in the positive direction is passed through the motor 1, the motor 1 rotates in the forward direction.

When the motor 1 rotates in the forward direction, the pin 13 is pushed by the protrusion 14 from the solid line position and passes over the B line to reach the right end of the window 11, as shown by the upper arrow in FIG.

During that time, the distance 13-15 between both ends of the elastic body 16 is maximum on line B, and therefore the tensile force of the elastic body 16 is maximum on line B, and beyond line B, the component force (in the direction of the lower arrow) gradually increases. Finally, the point plate 10 is swung in the direction of the lower arrow to reach the position indicated by the two-dot chain line.

For this reason, as shown in FIG. 3, electrode play) 23.
24, contacts 19 and 20 and contacts 21 and 22 are closed, respectively, and the motor 1 is rotated in reverse.

When the motor 1 begins to rotate in reverse, the protrusion 14,14' of the worm wheel 4 rotates counterclockwise, and the protrusion 14' pushes the pin 13 to move it to the left end of the window 11, as shown by the arrow at the top of FIG.

During this time, the length of the elastic body 16, and thus the tensile force, is maximum at line C, and when the elastic body 16 crosses line C, the point plate 10 is moved in the direction of the lower arrow by the force.

In this way, the snap action of the elastic body 16 establishes a neutral point reversal mechanism (point play)-10, making it possible to reliably switch the direction of rotation of the wiper motor in the presence of resistance due to friction of the contacts and fulcrums.

The rotation angle of the shaft 5 (the rotation angle of the wiper arm 6) is
Since the wiping angle is determined by the angle θ at which the pin 13 can move within the window 11 and the angle formed by the stopper 25, 25, when it is desired to rotate the rotation angle of the shaft 5 left and right by an appropriate angle. The angle θ and the angle formed by the stoppers 25, 25 may be set accordingly.

Further, the wiping angle is changed by changing the angle formed by the two protrusions 14° and 14'.

In conventional wiper drive devices, the rotary movement of the motor in only one direction was used to cause the blade to perform the wiping movement through a link mechanism, but this did not allow the blade to rotate left and right at a wide angle. However, in the device according to the present invention, the motor itself can be rotated alternately in forward and reverse directions at regular intervals, so the blade can be rotated left and right at an expanded angle.

In addition, conventionally, a non-knock mechanism and the like were complicated to perform the wiping motion, but the device according to the present invention does not require a link mechanism and has a simple device structure, which has excellent effects. can.

Furthermore, since the switching of the switch is carried out by the elastic body 16 with a snap action, the switching of the switch is quick and reliable.

The wiper drive device of the present invention is most effective when used as a wiper wiper.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a rear view, FIG. 2 is a sectional view taken along line A-A shown in FIG. 1, and FIG. 3 is a view similar to the one shown in FIG. FIG. 4 is a rear view showing another operating state, and FIG. 4 is a wiring diagram of a switch section for switching the rotation direction. The symbols in the figure indicate the following parts. 1: Wiper motor, 2: Worm, 3: Case, 4:
Worm wheel, 5: Axis, 6: Wiper arm, 7:
Lid, 7a: Hole, 8: Pivot support, 9 Nilever plate, 10
: Point plate, 11: Window, 12: Window, 13: Pin, 14.14': Projection, 15: Projection, 16: Elastic body, 17: Plate, 18.19.20.21.22:
Contact, 23, 24: Electrode plate, 25: Stopper

Claims (1)

[Scope of utility model registration request] A lever plate 9 and a point plate 10 are rotatably supported on the lid 7 of the case 3 by a pivot 8, and both the plates 1-9 and 10 are arranged on the opposite side to the pivot 8. Both ends of the elastic body 16 are respectively locked between the pin 13 fixed to the free end of the lever plate 9 and the free end of the point plate 10.
The pin 13 is engaged with the respective protrusions 14° 14' and rotated about the shaft support 8.
The lid 7 is provided with a window 11 that contacts the iron lid 7 and limits its rotation, and two stoppers 25 and 25 that engage the point plate 10.
The wiper drive device is provided with a switch for switching the rotational direction of the wiper motor 1 by the snap action of the elastic body 16 between the wiper motor 1 and the wiper motor 1.