JPS60213542A - Windshield wiper device for automobile - Google Patents

Abstract

PURPOSE:To make an operating area of a wiper arm enlargeable so sharply a range, by making the arm so as to vary its length while operating the wiper arm for wiping clean. CONSTITUTION:When a wiper arm 1 rocks itself centering on a wiper pivot 6, a driven gear 14 of a gear mechanism 11 rolls on a tooth surface of a fixed gear 13. On the other hand, since an actuating rod 12 is connected to a position being offset out of a turning center of the driven gear 14, it performs rectilinear motion with rotation of the driven gear 14, causing a sub-arm 4 to operate its retractable motion. A retractable stroke L of the sub-arm 4 is secured as a turning path diameter l of a connecting point 18 with the driven gear 14 of the actuating rod 12. Thus, the wiper arm is able to sharply enlarge its opening area because of varying its length while doing its wiping operation.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a wiper device for a motor vehicle.

Conventional wiper devices for automobiles include, for example, Utility Model Application No. 58-157.
As shown in Japanese Patent No. 756, the wiper force is extended during the swinging process of the wiper arm.

There are already known wiper blades that can be compressed to expand the area of the windshield wiped by the wiper grade. This consists of a main arm that connects the wiper arm to the wiper pivot, and a sub-arm that is fitted into the main arm so that it can move forward and backward, and a fixed link is provided on the wiper pivot, and the eight layers of this fixed link are connected to each other. By connecting a rotation link across the sub-arm, the sub-arm is moved forward and backward during the swinging process of the wiper arm.

However, in such a conventional structure, since the sub-arm advances and retreats only one stroke with each forward or backward movement of the wiper arm, there is a natural limit to the expansion of the wiping area, and it is difficult to significantly expand the wiping area. I can't wait. In addition, since the advancing movement of the sub-arm is performed by the bending and stretching action of the fixed link and the rotating link, in order to ensure a sufficient advancing and retreating stroke of the sub-arm, the connection length between the fixed arm and the rotating frame must be made long. It is necessary to set it. As a result, when the sub-arm is at its maximum retreat, the fixed link and rotating link are bent at a small angle and extend to the sides of the wiper arm, which only makes it difficult to arrange the wiper device on the vehicle body. Moreover, a problem arises in that the appearance becomes unsatisfactory. In addition, since the scissors are moved forward and backward by the h11 extension of the fixed arm and the rotating arm, the force acting in the direction of pressing the tensile arm against the main arm is large, and the force between the sub arm and the outer arm is large. The sliding resistance is extremely large, which impedes the smooth movement of the sub-arm, in other words, the smooth movement of the wiper blade, resulting in a problem of reduced wiping performance. The t9-wiper device for automobiles shown in Figure 1 was proposed in view of the above-mentioned problems, and is designed to allow the sub-arm to advance and retreat multiple times during one swinging process of the wiper arm. .

In this system, the pivot that connects the main arm is formed hollow, and a rotating shaft is provided that passes through the interior space of the pivot. A crank is provided at the tip of this rotating shaft, and the rotating shaft straddles the free end of the crank and the sub-arm. It is a combination of dynamic links, and the number of times the sub-arm moves forward and backward can be set by adjusting the gears of the gear system that rotates the pivot and the gear system that rotates the rotating shaft on which the pivot is placed. be.

However, in this structure, the pivot, which is subjected to a large load when the wiper arm swings, needs to be formed hollow, which makes it difficult to obtain sufficient strength for the pivot, which tends to cause guts. Not only that, but also the rotation of the pivot and rotating shaft requires a large number of gears, which increases the number of parts and requires an extremely large number of assembly steps.

Purpose of the Invention In view of the conventional situation, the present invention has a simple structure that allows the sub-arm to move forward and backward multiple times during the forward or backward movement of the wiper arm, thereby expanding the wiping area, as well as moving the sub-arm forward and backward. The wiper blade can operate smoothly, further improving the wiping performance of the wiper blade, and the sub-arm drive mechanism does not protrude to the side of the wiper arm, making it easier to arrange the parts on the vehicle body. It is an object of the present invention to provide a wiper device for an automobile that can be used to improve the appearance of the wiper device.

Structure of the Invention In order to achieve the above-mentioned object, according to the present invention, the wiper arm connected to the wiper pivot is composed of a main arm on the wiper pivot side and a sub-arm fitted into the main arm so as to be movable forward and backward. On the other hand, there is a gear mechanism consisting of a fixed gear provided on a pivot bearing, a driven gear tooth that is pivotally supported by the main arm and meshes with the fixed gear east, one end of which is connected to the sub-arm, and the other end of which is offset from the rotation center of the driven gear. A sub-arm driver 11t consisting of an operating rod connected to a position is attached.

Example Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In Fig. 1.2, l is a wiper arm 'kyjz connected and fixed to the wiper pivot 4 end, and this wiper arm l is movable back and forth within the main arm λ on the wiper pivot side and approximately the front half of the main arm co. It is composed of a fitting companion sub-arm V, and a wiper blade (not shown) is attached to the front end of this sub-arm V. The main arm λ shoulders an arm head 3 which is rotatably connected to the bin S at its rear end, and this arm head 3 is fitted into the wiper pivot B through serrations and fixed by tightening a nut. A spring is stretched across the part of the connecting pin S of the arm head 3 that is also offset downward and the middle part of the main arm. The wiper blade is biased downward to press the wiper blade against a window glass surface (not shown). IO indicates a drive mechanism for the sub-arm Hiro, and the drive machine wtio is roughly composed of a gear mechanism // and an actuating rod 12 that converts the rotational movement of the gear mechanism // into a linear motion of the sub-arm Hiro. The gear mechanism // is rotatable by a fixed gear 13 fixed to the pivot holder t of the wiper pivot 7 and a shaft supported by the main arm co, specifically a support shaft /3f on the lower surface of the arm head 3. A driven gear/
It consists of 44. One end of the actuation rotor is rotatably connected to a pin 16 projecting downward from the rear end of the sub-arm Hiroshi, and the other end is located at a position offset from the center of rotation of the driven gear 74F, for example in this embodiment. In this example, a projecting piece 17 formed integrally with the driven gear /l is rotatably connected to a pin /l that projects downward.

In addition, 19 in FIG. 1.2 indicates a sealing member -O indicates a vehicle body panel.

According to the structure of the embodiment described above, when the wiper arm 1 swings around the wiper pivot 4t, the driven gear /4L of the gear mechanism 11 rolls upward to #I of the fixed gear /J. On the other hand, since the operating rod /2 is connected at a position offset from the rotation center of the driven gear 14c, the driven gear 74c
It moves linearly with the rotation of 4, thereby moving the sub-arm μ forward and backward.

Here, the connection point of the operating rod l with the driven gear /44,
(i) As shown in FIG. 8, the position of the bin itr moves on the circumference around the rotation center 13 of the driven gear 1 due to the rotation of the driven gear 4'. Therefore, the forward and backward stroke of the sub-arm Hiroshi is obtained by assuming the diameter of the rotation locus of the connection point /II, and the maximum amount of extension of the wiper arm/side of the connection point /l by half that.

As a result, the maximum lateral overhang of the wiper arm l of the connection point it can be made smaller compared to the conventional two-bar link type, and the center of the pivot 4 and the connection points /I and /4 are connected. The refraction angle can be increased, thereby reducing the component force acting in the pressing direction from the sub-arm V to the main arm λ1~, reducing the sliding resistance between these two, and improving the smoothness of the sub-arm V. It is possible to perform all forward and backward movements.

Next, the wiper device having the structure of this embodiment is installed, for example, in the fourth wiper device.
As shown in Fig. 5, the so-called single-arm type wiper wiper wipes the windshield by swinging a single wiper arm approximately 180 degrees within the plane of the windshield G. Ru.

Here, the driven vehicle /4' is 180 degrees of the wiper arm l.
'For swinging, move 11!1111 of fixed binoculars 13 2
It shall rotate.

In a general wiper device in which the wiper arm does not extend or contract, the wiped area of the windshield G, as shown by the chain line in Figure 4, is obtained by the circular motion locus of the wiper grade W-B centered on the wiper pivot 6. .

In the device of this embodiment, as shown in FIG. 5, when the wiper arm l moves forward from the stop position, the driven gear 744
rotates on the tooth surface of fixed gear /3, so the actuating rod 1
The connecting point /l of 2 moves on a circular orbit centered on the rotation center outside the driven gear, pushes the actuating rod 12, and moves the sub-arm Hiroshi. When arm 1 swings 45 degrees, the connection point /1 moves 180 degrees, and sub-arm 1 is advanced to its maximum extent.

When the wiper arm l swings further, the wiper arm μ begins to move backward due to the movement of the connection point l♂, and the
/ dE u O°Sub-Ar All in oscillated position
returns to its original maximum retraction position. wiper arm/90
The above-mentioned behavior is repeated again by swinging from ' to 18 (1 degree). The broken line a in the #Ib diagram shows the #movement locus of the connection point 16 on the sub-arm side of the actuating rod l. This locus of movement is the locus of movement of blade W-B. Therefore, as shown by the solid line in FIG.
This is necessary because the oscillation of 0' causes a bulge to form on both upper side corners of the window glass G, and the wiping area can be greatly expanded from AI to A. In addition,
The so-called double' which operates a pair of wiper units synchronously
Similarly, in the r-type wiper, when the wiper arm is moved forward or backward, the wiper arm can be moved forward and backward several times to enlarge the wiped area.

In the embodiment shown in Fig. 6.7, a guide arm 2a is provided protruding from the front end of the main arm co, and a sub arm V- is formed into a cylindrical shape and is slidably fitted onto the guide arm 2a. The operating mode is exactly the same as in the previous embodiment. However, in this embodiment, since the sub-arm Hiro can be reinforced from the inside by the guide arm 2a, a resin molded body can be used instead of the sub-arm, which improves the sliding properties of the sub-arm Hiro and makes it lightweight. There are some points that can be improved.

Effects of the Invention As described above, according to the present invention, the sub-arm can be moved forward and backward multiple times during the forward and backward movement of the wiper arm with a simple structure, thereby greatly expanding the wiping area. In addition, the sliding resistance between the sub-arm and the main arm can be made as small as possible, and the rigidity of the pivot is not impaired, so the movement of the arm is smooth. This can further improve the wiping performance of the wiper grade. Furthermore, since the lateral protrusion of the wiper arm of the sub-arm drive mechanism can be kept to a minimum, it is possible to easily arrange the cast on the body, and it also has a great practical effect of not causing the wiper arm to fall over in the evening. .

[Brief Description of the Drawings] Fig. 1 is a perspective view showing essential parts of an embodiment of the present invention, 11g
Figure 2 is a 6j cut 1111 on line II-II in Figure 1,
FIG. 8 is an explanatory diagram of the operation mode of the drive mechanism, FIG. 4 is an explanatory diagram of the operation when the same embodiment device is applied to a jing lure 5 type wiper device, and FIG. 5 is an explanatory diagram of the operation mode of the same drive mechanism. Figure #46 is a simplified diagram showing a different example of the present invention, and Figure 7 is a sectional view taken along the line ■--■ in Figure 3116. l...wiper arm, λ...main arm, V.
...Sub arm, 6...Wiper pivot, t...
Bearing, 10... Sub-arm drive mechanism, /C... Gear mechanism, /2... Operating rod, /3... Fixed gear, Lda... Driven vehicle.

Claims (1)

[Claims] (1) The wiper arm connected to the wiper pivot is composed of a main arm on the wiper pivot side and a sub-arm fitted to the main arm so as to be able to move forward and backward,
A two-wheel mechanism consisting of a fixed gear provided on a pivot bearing and a driven gear that is pivotally supported by a main arm and meshes with the fixed gear, and a position where the other end is offset from the rotation center of the driven gear. A patented automobile wiper device is provided with a sub-arm drive mechanism consisting of an operating rod connected to the t-patent.