JPS6325249Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wiper drive device for wiping mirrors, headlamps, etc.

Conventional wiper drive devices can be broadly divided into mechanical drive devices that use a crank link mechanism, etc.
There is an electronic drive device that uses an IC circuit or the like.
In a mechanical drive device, if the wiper is provided with a reciprocating rotational movement and a fixed position stopping mechanism, the structure becomes complicated and large.In addition, dimensional accuracy is required, which increases the number of assembly steps and costs. Become. Further, in an electronic drive device, there are many electronic parts such as ICs, and the temperature range in which these electronic parts are used is limited to an extremely narrow range.

In order to improve the problems of the mechanical drive device,
A wiper motor has been proposed that includes a forward/reverse switching mechanism that switches the circuit of the wiper motor between forward and reverse directions so that the wiper blade reciprocates within a predetermined angular range, and a fixed position stopping mechanism.

The present invention is a wiper drive device equipped with the above-mentioned forward/reverse switching mechanism and fixed position stop mechanism, and in particular, the mechanism has a simple structure to facilitate assembly, and can be made small and thin. The purpose of the present invention is to provide a wiper drive device that can be used.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

Reference numeral 1 denotes a case housing the driving device of the present invention, and is composed of an upper lid 11 and a lower lid 12. The wiper 2 that wipes the wiping surface L of a mirror or headlamp, etc., wipes within a predetermined wiping angle θ as shown in FIGS. 1 and 3, and is made of rubber as shown in FIG. The blade 21 of the stay 2
2, this stay 22 is pivotally attached to an arm 23, and a base 25 of the arm 23 and a fixing member 26 attached to the tip of the drive shaft 6 with a locking nut 27 are rotatably assembled, and a spring 24 The blade 21 is always urged toward the wiping surface L.

The drive device of the present invention that drives the wiper 2 and stops it at a fixed position includes a forward/reverse motor 3 having a worm gear 31, relay gears 4 and 5 rotated by the motor 3, and meshing with the relay gear 5. The drive shaft 6 is fixed to a gear 61 that rotates, and a rotation control mechanism. This rotation control mechanism includes a protrusion 62 and a protrusion 63 that are provided on the drive shaft 6 in a spaced apart manner while maintaining a predetermined wiping range angle θ.
and has. Further, the forward/reverse changeover switch 8 and the stop switch 9 operated by the protrusions 62 and 63 are arranged at an angle of approximately θ with the drive shaft 6 as the center.
The cam 7 is fixed to the case at a distance of 100 mm apart from each other, and the cam 7 is rotatably supported by a shaft 72 between the drive shaft 6 and the forward/reverse changeover switch 8. The cam 7 has one end extended to the side of the drive shaft 6 to form a protrusion 71, and as the drive shaft 6 rotates, the protrusion 71 comes into contact with the protrusions 62 and 63 to rotate the cam 7. and 2 on the other end.
The recesses 73a and 73b are arranged in parallel, and the recesses 7
A coil spring 74 is interposed in each of the coil springs 3a and 73b to elastically press the contacts 75a and 75b against the swing piece 81 of the forward/reverse changeover switch 8. This swinging piece 81 is supported by each of the terminals b and e, as shown in FIGS. 4 to 6. Terminals a and c are arranged at both ends of terminal b, respectively.
Terminals d and f are provided next to terminal e. The stop switch 9 has contact pieces g and h that are in contact with each other, and one contact piece g is connected to the drive shaft 6.
The protrusion 62 extends sideways and elastically bends when the protrusion 62 comes into contact with the rotation, thereby separating it from the contact piece h. FIG. 7 shows the electrical connection between the terminal, the contact piece, and the wiper switch SW. That is, connect terminal b on the positive side and terminal e on the negative side of power supplies B and T, terminal b is connected to either terminal c or a, and terminal e is connected to either terminal f or d. Connect to. This connection is made by connecting the two
The two swinging pieces 81, 81 are connected at the same time.
Wiper switch SW and stop switch 9 are connected in parallel, one connected to terminal a and the other connected to motor M3.
is connected to terminal d via. Further, the terminal c is connected to the terminal d. Therefore, when the wiper switch SW is ON, the rotation of the motor M when the terminals b and c, and e and f are connected, and the rotation of the motor M when the terminals b and a, e are connected.
The rotation of the motor M when and d are connected is forward/reverse rotation because the current is reversed.

Note that the worm gear 31 of the motor 3 and the large diameter gear 41 of the first relay gear 4 mesh with each other, and the small diameter gear 4
2 and the second relay gear 5 are in mesh with each other, and the gear 51 of the relay gear 5 and the gear 61 of the drive shaft 6 are in mesh with each other, so that the rotation of the motor 3 is decelerated and transmitted to the drive shaft 6. There is. Also, case 1
The upper part 11 and the lower part 12 are fastened together by screws 19.

Since the drive device of the present invention has the above-mentioned configuration, its operation and effects will be described next. The state of the cam 7 and stop switch 9 shown in FIG. 1 is the state in which the wiper 2 is stopped. Here, wiper switch
When the SW is turned on, the motor 3 is driven to rotate the drive shaft 6 in the direction of arrow R. and,
When the protrusion 62 rotates by an angle θ, the cam 7 is rotated to swing the swinging pieces 81, 81, and the terminals b, a,
Switch to connect terminals e and d. At this time, the current flowing through the motor 3 is reversed as shown in the circuit diagram of FIG. 7, resulting in reverse rotation. As the motor 3 rotates in the opposite direction, the drive shaft 6 similarly rotates in the opposite direction, and the protrusion 62 rotates the cam 7 in the opposite direction, as well as in the direction of the arrow S. Then, when the other protrusion 63 comes into contact with the cam 7 as shown in FIG.
The connection is switched to f, and a current in the forward direction flows through the motor 3, causing it to rotate in the forward direction. By repeating this, the wiper 2 rotates back and forth within a predetermined angle θ range to wipe the wiping surface L. Note that during this repeated operation, the protrusion 6
2 may separate the contact piece g of the stop switch 9 from the contact piece h, but the wiper switch SW
is in the ON state, wiper 2 never stops.

Next, while wiper 2 is operating, turn off the wiper switch.
When the SW is turned OFF, since the wiper 2 is in the middle position, the protrusion 62 is away from the stop switch 9 and the contact pieces g and h are in contact with each other, and the protrusion 6
The operation of the wiper 2 continues until the wiper 2 comes into contact with the contact piece g. The protrusion 62 comes into contact with the contact piece 9, and the contact piece h
When they are separated from each other, the stop switch 9 is turned OFF and the motor 3 is stopped. Therefore, the wiper 2 will stop at a fixed position.

As described above, according to the present invention, the drive device is equipped with a wiper reciprocating rotation movement and a fixed position stopping mechanism, has an extremely simple configuration and is easy to assemble, and the entire device is integrated into one unit. It has the advantage that it can be made small and thin and housed in one case.

[Brief explanation of the drawing]

1 to 7 show an embodiment of the present invention,
Figure 1 is a back view of the drive device with part of the lower cover removed, and Figure 2 is the same view of Figure 1 with the wiper installed.
3 is an explanatory diagram showing the wiping range of the wiper, FIG. 4 is a sectional view taken along the - line in FIG. 1, FIG. 5 is a sectional view taken along the - line in FIG. 4, and FIG. A of
The arrow view and FIG. 7 show a circuit diagram. 1... Case, 2... Wiper, 3... Motor, 31... Worm gear, 4, 5... Relay gear, 6... Drive shaft, 62, 63... Protrusion,
7...Cam, 8...Forward/reverse selector switch, 9...
Stop switch.

Claims (1)

[Scope of utility model registration request] A forward/reverse drive motor having a worm gear, a relay gear rotated by the motor, a drive shaft that meshes with the relay gear and operates, and a rotation control mechanism, the rotation control mechanism having a rotation control mechanism attached to the drive shaft. two protrusions protruding apart from each other at a predetermined wiping range angle; a cam that rotates by the two protrusions;
It consists of a forward/reverse switch that is switched by the rotation of the cam, and a stop switch that is turned off by one of the two protrusions, and when the wiper switch is on, the forward/reverse switch switches the wiper between the normal and reverse directions. A wiper drive device characterized in that, when the wiper is reversed and turned off, the one protrusion acts on a stop switch to stop the wiper at a fixed position.