JPH0217960Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a wiper link mechanism that transmits the rotational motion of a wiper motor via a link to an output arm fixed to the wiper drive shaft. This invention relates to a link mechanism for an automobile rear wiper that can have a wiping angle of 180°.

(Prior Art) Conventionally, as shown in FIG. 1, this type of link mechanism has two links: a first link b connected to one end of a crank a, and an output arm d fixed to a wiper drive shaft c. are connected by a cross link consisting of second links e and e, and by rotation of the crank a,
It is known that a swinging motion of the wiper with a wiping angle of 180° is obtained.

(Problem that the invention attempts to solve) However, according to this invention, the second
Since it requires links e, e and four connecting shafts f, f, f, f that connect these links c, c to the specially shaped output arm d and the first link b,
The structure of the link mechanism becomes complicated, which is undesirable.

(Means for Solving the Problems) The present invention simplifies the configuration of the wiper link mechanism, and uses the lever crank mechanism's rotation center as a driving shaft that rotates in conjunction with the wiper motor rotation. A pin is provided on the same axis at the connection point between the third link and the fourth link of the lever crank mechanism to slidably engage with a longitudinal guide groove provided in the output arm fixed to the drive shaft of the wiper. It is characterized by

(Example) The present invention will be explained below based on the example shown in FIG.

First, the lever crank mechanism 1 will be briefly explained.

As shown in FIG. 3, the lever crank mechanism 1 includes a first link 2 that is fixed, a second link 3 that completely rotates with respect to the first link 2, and a third link 4 that makes a reciprocating motion within a certain angle. and a fourth link 5 that connects the second link 3 and the third link 4, and is a conventionally known link. Here, in general,
The second link 3 is called a crank, and the third link 4 is called a lever.

In the one shown in the second figure, the rotation center 6 of the lever crank mechanism 1 is a driving shaft 7 that rotates in conjunction with the rotation of a wiper motor (not shown), and the first link 2 is the mounting plane of the wiper drive shaft 8. 9, but since the other configuration of the lever crank mechanism is the same as that shown in Figure 3, the same parts are shown in Figure 3.
The same reference numerals as those shown are given.

Furthermore, in the case shown in the second figure, a pin 10 is provided coaxially at the swing point of the lever, that is, the connection point between the third link 4 and the fourth link 5, and the output arm 11 fixed to the drive shaft 8 has a longitudinal axis. A guide groove 12 in the direction is provided, and the pin 10 is slidably engaged with the guide groove 12.

Thus, when the wiper motor is driven, the drive shaft 7 is rotated, and the rotational motion is converted into a reciprocating motion of the pin 10 within the guide groove 12, and the reciprocating motion is further transmitted via the output arm 11 as shown in FIG. This is converted into a reciprocating motion of the wiper drive shaft 8 having a sinusoidal rotational angle change as shown in FIG.

In addition, in the one shown in the second diagram, the crank is configured with the second link 3, but it is not limited to this.
For example, a fixed shaft may be provided upright on the peripheral edge of the reduction gear, and in this case, the fourth link 5 is connected to the fixed shaft.

(Effect of the invention) As described above, according to the invention, the third link and the fourth link of the lever crank mechanism are connected to the longitudinal guide groove provided in the output arm fixed to the wiper drive shaft.
Since the pin provided on the same axis at the connection point with the link is slidably engaged, the swinging movement of the wiper is controlled by a wiper with a wiping angle of around 180°, which is extremely compact compared to conventional wipers. Furthermore, the number of parts is small, the structure is simple, and it can be provided at a low price.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a link mechanism of a conventional wiper, Fig. 2 is a plan view showing an example of implementation of the present invention, Fig. 3 is an explanatory diagram of a lever crank mechanism, and Fig. 4 is a drive of the wiper. FIG. 3 is an explanatory diagram showing changes in the rotation angle of the shaft. 1... lever crank mechanism, 4... third link,
5... Fourth link, 7... Driving shaft, 8... Wiper drive shaft, 10... Pin, 11... Output arm, 12... Guide groove.

Claims (1)

[Scope of utility model registration request] The rotation center of the lever crank mechanism is a driving shaft that rotates in conjunction with the rotation of the wiper motor, and an output fixed to the wiper drive shaft is coaxially connected to the connection point between the third link and the fourth link of the lever crank mechanism. A wiper link mechanism characterized by having a pin that slidably engages with a longitudinal guide groove provided in an arm.