JPH0654365U - Drive mechanism of wiper device - Google Patents

Abstract

(57) [Abstract] [Purpose] Drives the wiper blade with a flexible wiper arm, reduces the load on the wiper drive mechanism or wiper drive motor when an excessive load is applied to the wiper blade, and prevents damage. . The rotating plate 3 is rotated in the direction of arrow a by the rotation of the drive shaft 2 of the wiper drive motor 1, and is converted into a reciprocating motion through an arm 5 having one end locked to a pin 4 to convert the arm 5 and the arm 7 into one. Of the wiper arm holder 9 attached to the tip end of the driven shaft.
Then, the wiper arm 10 is swung as indicated by arrow C, and the wiper blade 11 is reciprocally driven left and right as indicated by arrow D to wipe the front glass surface of the television camera case. Since the wiper arm has flexibility, it bends when the drive load of the wiper blade becomes excessive and absorbs the overload on the drive mechanism.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drive mechanism of a wiper device, and relates to a wiper drive mechanism that prevents damage to the wiper drive mechanism when an overload occurs in driving the wiper blade.

[0002]

[Prior art]

 When a television camera (hereinafter abbreviated as "camera") is installed outdoors and monitoring is performed by remote control, rain or snow adheres to the lens and blocks the field of view of the camera, rendering it useless. To prevent this, for example, as shown in FIG. 2, the camera is housed in a camera case 21 in which a transparent glass 22 is fitted on the front surface, a wiper blade 11 is provided on the front surface of the front glass 22, and the upper portion of the camera case 21, etc. The wiper drive motor built in the wiper unit 23 installed in the drive unit is driven by remote control, etc., and the arm 24 is reciprocally driven in a fan shape as shown by the arrow C. The front side of the wiper blade 11 attached to the tip of the arm 24 There is one in which the surface of the glass 22 is wiped to remove the rain or snow adhering to it to secure the view of the camera.

The structure inside the wiper unit 23 is, for example, as shown in FIG. 3, a rotary plate 3 is attached to a drive shaft 2 of a wiper drive motor 1 having a reduction drive mechanism, and a pin 4 provided on the rotary plate 3 is attached. One end of the arm 5 is rotatably supported by the, and the other end of the arm 5 is rotatably joined to the arm 7 at a contact point 6, and the fulcrum of the arm 7 is fixed to the driven shaft 8. As a result, when the rotary plate 3 is rotated in the direction of arrow a by the drive of the wiper drive motor 1, the joint point 6 of the arm 5 and the arm 7 is rotated in an arc shape as indicated by arrow b according to the rotation. The driven shaft 8 which pivotally supports the arm 7 is rotated by the movement, whereby the wiper arm 24 swings through the wiper arm holder 9 provided at the tip of the driven shaft 8 as shown by the arrow C, and the wiper blade 11 Drive back and forth like arrow D, Note that the surface of the front glass 22 is wiped off from rain and snow.

[0004]

In the drive mechanism of the wiper device described above, for example, when the wiper blade is covered with snow due to snowfall in winter and is frozen due to cold, the wiper drive motor or wiper drive mechanism is overloaded. This may cause problems such as a load being applied, an overcurrent flowing in the motor windings, and burnout, and the gears of the reducer or parts of the link mechanism being damaged. In order to solve these problems, conventionally, for example, there is a structure in which the rotary plate has a friction clutch structure and the friction clutch absorbs an overload to prevent damage to the motor or the gear of the reduction gear. However, the friction clutch is a consumable item that wears due to friction on the friction surface, which requires high operating costs and has a large number of parts and a complicated structure. In view of the above-mentioned conventional problems, the present invention does not require a large number of parts such as the above-mentioned link structure, and does not damage each mechanical part when the wiper blade drive is overloaded due to snow or the like. It is to provide a mechanism for protection.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention solves the above-mentioned problems by providing a wiper drive motor, a rotary plate attached to the drive shaft of the wiper drive motor, a first arm whose one end is pivotally supported by the rotary plate, and one end. A second arm in which the other end of the first arm is pivotally supported and the other end is pivotally attached to the driven shaft, and one end is pivotally attached to the driven shaft, and the other end is fanned by rotation of the driven shaft. A drive mechanism of the wiper device is constituted by a swingable wiper arm and a wiper blade provided at the tip of the wiper arm.

[0006]

[Action]

 With the above-described structure, in the drive mechanism of the wiper device according to the present invention, the rotary motion of the wiper drive motor is transmitted to the driven shaft via the arm or the like and rotates the driven shaft. As a result, the wiper arm fixed to the driven shaft swings like a fan, and the wiper blade connected to the tip of the wiper arm is reciprocally driven left and right to wipe away rainwater, snow, or the like adhering to the front glass of the camera case. The wiper arm is made of an elastic material that is flexible so as to have flexibility, and when the wiper blade is overloaded due to snow or the like, the wiper arm bends to absorb the overload and drive the wiper. Reduces overload on the motor and prevents damage to mechanical parts.

[0007]

【Example】

 Hereinafter, embodiments of a drive mechanism of a wiper device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of an essential part of an embodiment of a drive mechanism of a wiper device according to the present invention. In the figure, reference numeral 1 is a wiper drive motor, which has a built-in reduction mechanism and rotates the drive shaft 2 at an appropriate speed. A rotary plate 3 is fixed to the drive shaft 2 and rotates in the direction of arrow A when the wiper drive motor 1 rotates. Reference numeral 4 denotes a pin, which is provided on the rotary plate 3. Reference numeral 5 denotes an arm, one end of which is locked to a pin of the rotary plate 3 and the other end of which is pivotally supported at one end of an arm 7 at a joint point 6, which converts the rotary motion of the rotary plate 3 into reciprocating motion. The joining point 6 is rotated in an arc shape as indicated by an arrow B. Since the arm 7 is pivotally attached to the driven shaft 8, the rotation of the arm 7 causes the driven shaft 8 to rotate. It should be noted that reference numerals 1 to 8 are parts that are built in the wiper unit 23, and the driven shaft 8 is mounted in the wiper unit 23.

A wiper arm holder 9 is provided at the tip of the driven shaft 8 and rotates together with the driven shaft 8. By this rotation, the wiper arm 10 attached to the wiper arm holder 9 is fan-shaped as shown by arrow C. Rock to. As a result, the wiper blade 11 connected to the tip of the wiper arm 10 is reciprocally driven left and right as indicated by arrow D, and the surface of the front glass 22 of the camera case 21 is wiped.

The rotation of the wiper drive motor 1 causes the rotary plate 3 to rotate in the direction of arrow a via the drive shaft 2, whereby the arm 5 whose one end is locked to the pin 4 is converted into reciprocating motion. The joint point 6 with the arm 7 is rotated in an arc shape as indicated by arrow B. By this rotation, the driven shaft 8 pivotally mounted on the other end side, which is the shaft fulcrum of the arm 7, is rotated, whereby the wiper arm 10 swings as shown by arrow C, and this swinging. The wiper blade 11 is reciprocally driven according to the movement as shown by arrow D.

When the wiper drive motor 1 is operated in a state where the windshield 22 of the camera case 21 is snowed due to snowfall and the wiper blade 11 cannot move, the wiper blade 11 does not rotate even if the rotary plate 3 rotates. I can't move. In such a case, the wiper arm 10 bends and absorbs the power for driving the wiper transmitted through the driven shaft 8, the arm 7, the arm 6 and the rotary plate 3, and the respective arms or the wiper drive model. The excessive load on the motor 1 and the like is reduced, and the burnout of the winding of the wiper drive motor 1, the damage of the gear of the speed reducer, and the damage of each arm are prevented. For this purpose, the wiper arm 10 is composed of, for example, a coil spring having appropriate elasticity, and when the wiper blade 11 is frozen or when an excessive load is applied due to snow or the like, the wiper arm 10 expands and contracts. It bends in the shape of a letter, and this alleviates the load, and in the case of a normal load, the wiper blade 11 is normally wiped.

[0011]

[Effect of device]

 As described above, according to the drive mechanism of the wiper device of the present invention, the wiper blade is driven by the power of the wiper drive motor via the wiper arm having appropriate elasticity. , The wiper arm bends and absorbs this overload, so it is more durable and more durable than the conventional one that uses a friction clutch to absorb the overload. Is easy and can reduce the cost.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of an embodiment of a drive mechanism of a wiper device according to the present invention.

FIG. 2 is an overall view showing the concept of a drive mechanism of a wiper device including a camera case body.

FIG. 3 is an example of a drive mechanism of a conventional wiper device.

[Explanation of symbols]

 1 wiper drive motor 2 drive shaft 3 rotating plate 5 arm 7 arm 8 driven shaft 9 wiper arm holder 10 wiper arm 11 wiper blade

Claims (1)

[Scope of utility model registration request] 1. A wiper drive motor, a rotary plate attached to a drive shaft of the wiper drive motor, a first arm whose one end is pivotally supported by the rotary plate, and one end of which is the first arm. A second arm that is rotatably supported at the other end and has the other end pivotally attached to the driven shaft, and a bendability in which one end is pivotally attached to the driven shaft and the other end swings in a fan shape by the rotation of the driven shaft. A drive mechanism for a wiper device comprising a wiper arm and a wiper blade provided at the tip of the wiper arm.