JPS633787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pantograph type wiper wiping device for wiping away raindrops etc. adhering to the windshield glass surface of an automobile, and in particular, the wiping angle of the wiper blade is highly accurate and the wiper is mounted with high precision. This paper proposes a pantograph-type wiper wiping device that can

In a pantograph type wiper wiping device, the wiper blade that slides on the windshield glass surface is rotatably supported by a main arm and an auxiliary arm at two supporting points spaced apart by an appropriate length, and the wiper blade is rotatably supported by a main arm and an auxiliary arm. The main arm and the auxiliary arm are attached to a main shaft and an auxiliary shaft, respectively, which are provided to protrude outward from the vehicle body, and the main arm is rotationally driven by a motor while the auxiliary arm and the auxiliary shaft are rotated relative to each other. In particular, the main arm and the auxiliary arm work together to maintain the wiper blade in a fixed direction while sliding the windshield glass surface to wipe off the raindrops that have adhered to it.
In conventional devices, the main shaft to which the main arm is attached is attached to a motor case that houses the wiper drive motor, link mechanism, etc.
The auxiliary shaft was attached to the vehicle body. However, because car bodies usually have complex curved shapes and are manufactured using many processes such as pressing and welding, it is difficult to match the gap distance between the main shaft and the auxiliary shaft to a predetermined value with high precision. , and it is not easy to maintain a parallel relationship between the two with high precision. Furthermore, it is difficult to install the main shaft and the auxiliary shaft so that the angle between the axial direction and the wiping surface is perpendicular. For this reason, the wiper blade does not necessarily slide on the windshield glass surface at a desired wiping angle, and there is a risk that variations in wiping performance may occur.

The present invention has been made in view of the above points, and an object of the present invention is to provide a pantograph wiper wiping device that can obtain a highly accurate wiping angle and has high wiping performance. A pantograph wiper wiping device according to the present invention includes a pantograph wiper wiping device in which a wiper blade is supported by a main arm and an auxiliary arm, and includes a motor case housing a motor for swinging the main arm, and a motor case connected to the motor. a main shaft rotatably attached to the shaft mounting surface so as to protrude outward from the shaft mounting surface of the motor case; and a main shaft mounted on the shaft mounting surface near the main shaft substantially parallel to the main shaft. an auxiliary shaft attached thereto, the main arm and the auxiliary arm are coupled to the main shaft and the auxiliary shaft, respectively, and the coupling between the auxiliary shaft and the auxiliary arm includes a joint at a distal end of the auxiliary shaft. A ball is formed and a bowl-shaped recess is formed at the tip of the auxiliary arm, so that the joint ball is fitted into the recess.

Hereinafter, the present invention will be specifically explained based on the drawings. FIG. 1 is a plan view of a motor case 1 showing one embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a front view showing a wiper operating section attached to the motor case 1. The motor case 1 is manufactured by molding resin, and consists of a box-shaped case portion 1a and its lid 1b. A motor and a link mechanism (both not shown) for swinging the wiper blade are housed in the case portion 1a, and the case portion 1a and the lid 1b are fastened together with bolts 4 at five locations. It is becoming fixed.
A cylindrical support shaft 2a is fixed perpendicularly to the shaft mounting surface A, which is the bottom surface of the box-shaped case portion 1a, approximately at the center in the width direction thereof. The support shaft 2a has a thread cut on its outer circumferential surface, and in order to fix the motor case 1 to the vehicle body (indicated by a dashed line in FIG. 1), a spring washer 2c is fitted, and a nut 2b is fitted. It is designed to be screwed together. The main shaft 2 is inserted through this cylindrical support shaft 2a. The main shaft 2 has a support shaft 2a inserted through the inner surface of the case portion 1a so that its tip protrudes from the support shaft 2a to the outside, and a stopper (not shown) is provided at the rear end to allow the main shaft 2 to extend from the support shaft 2a to the outside. It is made so that it cannot be pulled out. The rear end of the main shaft 2 located inside the motor case 1 is connected to a link mechanism housed inside the motor case 1, and the rotational driving force of the motor is converted into reciprocating rotational motion by the link mechanism. The signal is transmitted to the shaft 2. The tip of the main shaft 2 is threaded so that the main arm 8 can be fixed to the main shaft 2 as described later. The cap 2d is made of rubber and is fitted onto the support shaft 2a to prevent rainwater from entering the vehicle body.

Thus, in the present invention, the auxiliary shaft 3 is mounted on the shaft mounting surface A to which the main shaft 2 is mounted, at an appropriate distance from the main shaft 2. The auxiliary shaft 3 includes a joint ball 3a and a support portion 3.
b, and is integrally formed with the pillar part 3.
The end on the B side is threaded and is attached to the shaft mounting surface A.
is inserted into the motor case 1, and is fixed vertically to the case portion 1a by screwing into a nut burred on the back side of the shaft mounting surface A. The joint ball 3a has a substantially spherical shape with a predetermined diameter, and connects the auxiliary arm 9 and the auxiliary shaft 3, as will be described later. Further, a bolt 5b is fixedly installed on the shaft mounting surface A at a position facing the auxiliary shaft 3, a spring washer 5c is fitted to the bolt 5b, and a nut 5a is further screwed onto the tip end of the bolt. By doing so, the motor case 1 is fixed to the vehicle body. Note that a set plate 6, which is a thin metal plate, is superposed on the shaft mounting surface A so as to cover the main shaft 2, the auxiliary shaft 3, and the bolts 5b. Efforts have been made to improve the accuracy of the gap distance and the strength of these attachments. Further, 7 is a recess provided in the shaft mounting surface A to regulate the relative positional relationship with the vehicle body when the motor case 1 is attached to the vehicle body.

As described above, the motor case 1 with the main shaft 2 and the auxiliary shaft 3 attached to the shaft mounting surface A is bolted to the vehicle body (indicated by the dashed line in FIG. 1) with each shaft protruding outside the vehicle body. 2b and 5
Tighten and secure with a. Then, as shown in FIG. 3, the mounting portion 8b at the tip of the main arm 8 of the wiper operating section is fixed to the tip of the main shaft 2 by tightening a nut. An arm shank 8a is fixed to the end of the main arm 8 on the side of the motor case 1, and an attachment part 8b to the main shaft 2 is attached to the arm shank 8a so that the main arm 8 can rotate from the glass surface to be wiped. The main arm 8 is connected so as to be able to stand upright, and the main arm 8 is biased toward the glass surface by a spring spring (not shown) interposed between the arm shank 8a and the mounting portion 8b. The auxiliary arm 9 has a mounting portion 9a fixed to its tip on the motor case 1 side, and a substantially spherical recess (not shown) that aligns with the joint ball 3a is provided at the tip of the mounting portion 9a. The auxiliary arm 9 is attached to the auxiliary shaft 3 by fitting the recess into the joint ball 3a. In this way, since the auxiliary arm 9 and the auxiliary shaft 3 are connected by a ball, the auxiliary arm 9 can rotate relative to the auxiliary shaft 3 in its circumferential direction, and
The auxiliary arm 9 can also rotate in a direction in which it stands up from the glass surface.

A connector 10 is fixed at a proper position on the wiper blade 11, and the connector 10 is attached to the opposite end of the attachment parts 8b and 9a of the main arm 8 and the auxiliary arm 9 at two supporting points spaced apart by an appropriate length. are rotatably supported on the respective parts. Therefore, if the length dimensions of the main arm 8 and the auxiliary arm 9 are set appropriately, the wiper blade 11 can be pressed against the windshield glass surface in parallel to the edge in the height direction, and while maintaining that position, the wiper blade 11 can be By swinging the arm 8, the windshield glass surface is reciprocated in a direction perpendicular to the longitudinal direction of the wiper blade 11.

According to the present invention, the main shaft 2 and the auxiliary shaft 3, which support the main arm 8 and the auxiliary arm 9 of the pantograph wiper, are both attached to the motor case 1. The gap distance of the shafts 3 and their parallel relationship can be set with high precision, and each of these shafts can be easily set perpendicular to the windshield glass surface.
The wiper blade 11 never comes into contact with the edge of the windshield glass surface. On the other hand, since the auxiliary arm 9 and the auxiliary shaft 3 are connected by a ball joint, the auxiliary arm 9 is connected to the auxiliary shaft 3.
Since the wiper blade 11 can rotate not only in the circumferential direction but also in the torsional direction, the force in the torsional direction applied to the auxiliary arm 9 when the wiper blade 11 slides on the windshield glass surface having a complicated curved shape is buffered. In addition, the wiper blade 11 that moves back and forth alternately falls backward in the direction of movement due to the frictional resistance of sliding, but this also buffers the torsional force applied to the auxiliary arm 9, so that the sliding of the wiper blade 11 is reduced. The ability of the auxiliary arm 9 to follow the movement is high, and unevenness does not occur. Therefore, the wiping performance according to the present invention is high, and unnecessary loads are not applied to the wiper drive motor and the gears of the link mechanism, so that the durability of the motor and the entire wiping device can be improved.

As explained in detail above, according to the present invention, the gap distance, parallel relationship, and perpendicular relationship to the wiping surface of the main shaft and the auxiliary shaft to which the main arm and auxiliary arm of the pantograph type wiper are attached can be set with high precision, and the auxiliary Since the arm can easily follow complicated movements, the wiping performance is extremely high. It should be noted that the present invention should not be limited to the specific embodiments described above, and it goes without saying that various modifications can be made within the technical scope of the present invention. For example, the motor case is not limited to resin, and various materials such as aluminum die-cast can be used.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a motor case 1 showing one embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a front view showing a wiper operating section attached to the motor case 1. . (Explanation of symbols), 1...Motor case, 2...
Main shaft, 3... Auxiliary shaft, 8... Main arm, 9... Auxiliary arm, 11... Wiper blade.

Claims (1)

[Claims] 1. In a pantograph wiper wiping device in which a wiper blade is supported by a main arm and an auxiliary arm, there is provided a motor case housing a motor that swings the main arm, and a motor case connected to the motor and extending outward from the shaft mounting surface of the motor case. a main shaft rotatably mounted on the shaft mounting surface so as to protrude from the main shaft; and an auxiliary shaft mounted substantially parallel to the main shaft on the shaft mounting surface near the main shaft; The main arm and the auxiliary arm are connected to the main shaft and the auxiliary shaft, respectively, and the auxiliary shaft has a joint ball formed at its tip, and the auxiliary arm has a bowl-shaped recess at its tip. A pantograph type wiper wiping device characterized in that the auxiliary shaft and the auxiliary arm are connected to each other by fitting the joint ball into the recess.