JPS6119965Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an intermittent washer liquid injection device for a wiper device for a vehicle.

A wiper motor with an intermittent contact mechanism installed inside the wiper motor has already been proposed in order to make effective use of the washer fluid by spouting it intermittently in connection with the interlocking of the wiper arm. Specifically, since it is attached to a worm gear mechanism, it is extremely difficult to create a structure that allows the contacts to be adjusted arbitrarily, and even if such a configuration could be realized, it would only increase the manufacturing cost. Instead, it is not preferable for a general user (driver) to open the inside of the motor and make adjustments as this may cause problems in the performance of the motor.

The present invention provides a washer fluid intermittent injection device in which a switch is provided on the outside of the wiper motor, that is, on the transmission link mechanism, thereby making it possible to easily adjust the injection timing and injection period according to the user's purpose and preference. The purpose is to

For this reason, the configuration of the present invention includes a link mechanism that drives the wiper blade by a wiper drive motor,
a shaft that is connected to the link of the link mechanism and rotates back and forth; an arc-shaped fixed contact plate disposed around the shaft; and a fixed contact plate that is provided at the tip of an arm attached to the shaft and that slides into contact with the fixed contact plate. and a switch consisting of the fixed contact plate and the movable contact, which are inserted into and connected to the energizing circuit of the washer drive motor.

To explain the present invention based on an embodiment, as shown in FIG. 1, the wiper device includes a wiper motor 21,
The four-bar linkage mechanism 20 is connected via a link 26 that is reciprocally driven by this, and a wiper arm 38 is swung by this, and a wiper blade 36 is attached to this wiper arm 38.
is supported to wipe the window glass 37. As shown in FIG. 2, the wiper motor 21
A worm 22 is connected to the main shaft of the worm 22, and a gear 23 supported by a shaft 24 meshes with the worm 22. One end of a link 26 is connected to the gear 23 by a pin 25. 4-bar linkage mechanism 2
0 is a pivot shaft 34 supported on the vehicle body side.
A link 32 is connected to the ends of a swingable short lever 35 and a long lever 29 connected by an idler shaft 27 via pins 33, 31, and a pin 28 is provided at the middle part of the lever 29. The ends of the links 26 are connected together. Also, lever 3
The wiper arm 38 is attached to the pivot shaft 34 that supports the wiper arm 38.
is installed.

The washer fluid intermittent injection device according to the present invention has a switch mechanism 3 disposed at the upper end of the idler shaft 27.
Constructed with 0. That is, as shown in FIG. 3, a base 7 made of an electrical insulator is arranged inside a housing 11 whose upper side is closed by a cover 12, and an arc-shaped fixed contact centered on an idler shaft 27 is disposed on the base 7. A board 8 is installed. On the other hand, an arm 10 is connected to the idler shaft 27 with a bolt 9, and a movable contact 10a that makes sliding contact with the fixed contact plate 8 is provided at the tip of the arm 10.
A switch consisting of a movable contact plate 10a and a movable contact plate 10a is inserted and connected to the energizing circuit of the washer motor 13.

Next, the operation of the device of the present invention will be described. When the wiper motor 21 is driven, the gear 23 is rotated by the worm 22, and the link 26 is reciprocated left and right. Therefore, the levers 29 and 35 are swung about the idler shaft 27 and the pivot shaft 34, respectively, and the wiper arm 38 is swung. Here, the rotation angle of the lever 29 is expanded by the four-bar linkage mechanism 20, and the lever 35 can obtain a larger swing angle than the lever 29. Idler shaft 2
7 is one that is rotated back and forth together with the lever 29;
As shown in FIG. 3, when the rotation angle of the idler shaft 27 is θ ₁ , the arm 10 that swings together with the idler shaft 27 rotates counterclockwise by an angle θ ₂ from the state shown in FIG. The switch is closed until the washer motor 13 is driven. and,
After the rotation angle θ ₂ , the movable contact 10a separates from the fixed contact plate 8, so the washer motor 13
is stopped, and when it has further rotated by an angle θ ₃ , it is reversed clockwise, and the movable contact 10a comes into contact with the fixed contact plate 8 again, so that the washer motor 13 is driven for a period corresponding to the rotation angle θ _2. (See Figure 4a). Therefore, if the washer fluid nozzle is arranged so that the washer fluid is spouted at a location a little closer to the center of the window glass 37 than the wiper arm or the return position of the wiper arm, the washer fluid will be ejected when the wiper blade 36 moves forward. The dust from the window glass 37 can be washed away from the sides of the window glass 37 toward the center, and the window glass can be cleaned with the minimum amount of washer liquid required, which may obstruct the driver's view or remove dust from the washer liquid. No liquid spills out of the car.

The amount of washer fluid can be adjusted by extending the injection period, as shown in FIG. This is achieved by changing the rotational phase of the base 7 supporting the base 8. For example, idler shaft 27
If the arm 10 is shifted an appropriate amount counterclockwise with respect to the swing angle θ ₁ of The moving angle θ ₂ increases, and the washer fluid can be injected in a larger amount or for the entire period.

As mentioned above, this invention provides a movable contact on the idler shaft and a fixed contact plate on the fixed part surrounding the idler shaft, and inserts and connects the switch consisting of these movable contacts and the fixed contact plate to the energizing circuit of the washer motor. Therefore, as the idler shaft rotates back and forth, the switch is opened and closed.
The washer liquid is intermittently injected in conjunction with the swinging of the wiper arm, and the window glass can be effectively washed with the minimum amount of washer liquid without obstructing the driver's view. and,
Since the switch mechanism is placed at the end of the idler shaft, it can be easily adjusted by the general user, and there is no risk of causing problems with the drive mechanism or motor of the wiper device due to this adjustment work. do not have.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a wiper device equipped with an intermittent washer liquid injection device according to the present invention, Fig. 2 is a schematic configuration diagram of the device, Fig. 3 is a plan view of the intermittent washer liquid injection device, and Fig. 4 is an explanatory diagram of the operation of the same device. 7: Base, 8: Fixed contact plate, 9: Bolt, 1
0: Arm, 10a: Moving contact, 11: Housing, 13: Washer motor, 20: 4-section link mechanism, 21: Wiper motor, 26: Link, 2
7: Idler axis, 29: Lever, 30: Switch mechanism, 32: Link, 34: Pivot axis, 35:
Lever, 36: Wiper blade, 38: Wiper arm.

Claims (1)

[Scope of utility model registration request] a link mechanism for driving a wiper blade by a wiper drive motor; a shaft connected to a link of the link mechanism to rotate back and forth; an arc-shaped fixed contact plate disposed around the shaft; and a fixed contact plate attached to the shaft. It is characterized by comprising a movable contact provided at the tip of the arm and slidably in contact with the fixed contact plate, and a switch composed of the fixed contact plate and the movable contact, inserted and connected to the energizing circuit of the washer drive motor. Washer liquid intermittent injection device.