JPS6347171Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wiper device used in automobiles, etc., and more specifically, the present invention relates to a wiper device used in automobiles, etc., and more specifically, the wiper device is operated oppositely to each other by a single wiper motor capable of forward and reverse rotation, which reverses once when stopped and then stops. The present invention relates to a wiper device with two blades that overlap at the same time.

This type of wiper device has been commonly used in the past, and in order to avoid collisions within the common wiping range of two overlapping blades, the magnitude relationship between the wiping angular velocities of both blades is determined during inward and outward wiping operations. It is common practice to reverse the Therefore, near the respective reversal positions of both blades, the change in the wiping angular velocity of both blades becomes large, and a large inertial force acts on the wiper device, which deteriorates the durability of various parts of the wiper device and generates loud operating noise. There were flaws.

On the other hand, as in Japanese Utility Model Publication No. 49-6016, there is a device that eliminates the above-mentioned drawback by making it possible to avoid collision within the common wiping range of both blades even if both blades move at approximately the same angular velocity during wiping operation. As is well known, in this method, a clutch mechanism having a complicated structure is built into the deceleration section of the wiper motor, which has the disadvantage that the number of parts increases and the wiper motor becomes large and expensive. Further, the connecting rod that drives the upper blade and the connecting rod that drives the lower blade are arranged at right angles, and the upper blade is driven in the eccentric direction of the eccentric shaft provided integrally with the drive gear and at the stop position. Since the longitudinal directions of the connecting rods must be in the same direction, the arrangement of these link mechanisms becomes troublesome, and the degree of freedom in arranging the link mechanisms is severely restricted.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to improve the change in the wiping angular velocity of both blades near the reversal position in a wiper device equipped with two blades that are operated opposite to each other and overlap at the stop position. To create a wiper device that can at least avoid collisions within the common wiping range, it has fewer parts, the wiper motor can be made smaller, it is cheaper, and the link mechanism can be arranged more easily. be.

Hereinafter, the present invention will be explained in detail based on a first embodiment shown in FIGS. 1 to 5.

1 and 2 are explanatory diagrams showing the operating states of the wiper device according to the first embodiment of the present invention when the wiper is stopped and when the wiper is activated, respectively, and FIG. 3 is the main part of the wiper device according to the first embodiment of the present invention. FIGS. 4 and 5 are partial longitudinal cross-sectional views showing the wiper motor, and are cross-sectional views taken along the line A--A in FIG. 3, respectively, showing the operating states of the wiper motor during normal rotation and reverse rotation.

In FIGS. 1 to 5, reference numerals 1 and 2 are blades that are operated opposite to each other by a wiper motor 7 and overlap each other at a stop position, and are attached to one end of wiper arms 3 and 4, respectively. A first pivot shaft 5 and a second pivot shaft 6 are fixed to the other ends of both wiper arms 3 and 4 for reciprocating the upper blade 1 and the lower blade 2, respectively.

The wiper motor 7 is a motor capable of forward and reverse rotation, which rotates forward when the wiper device is in operation, and once reverses when the wiper device is stopped, and then stops at a predetermined stop position.A crank arm 8 is fixed to the output shaft 7a of the motor 7. It has been done. A crank pin 9 is fixed to the other end of the crank arm 8, and an eccentric bearing 10 having an eccentric amount ε is pivotally connected to the crank pin 9. 12
A first link mechanism includes a connecting rod 13 having one end pivotally connected to the eccentric bearing 10 via a first retainer 11, and an idler having one end pivotally connected to an idler pivot shaft 14 connected to the other end of the connecting rod 13. an arm 15; a first pivot arm 16 fixed to the first pivot shaft 5;
The connecting rod 17 has one end connected to the idler arm 15 and the other end connected to the other end of the idler arm 15. That is, the first link mechanism 12 is pivotally connected to the eccentric bearing 10 via the first retainer 11.
and the first pivot shaft 5. The connecting rod 13 is fixed to the first retainer 11 by a retainer ring 18.

As shown in FIG. 3, the crank pin 9 consists of a spherical part 9a whose upper surface is flat and a shaft part 9b.
The shaft portion 9b has a stepped shape, and its small diameter portion is fixed to the crank arm 8, and the eccentric bearing 1 is attached to its middle diameter portion.
0 is pivotally mounted, and a coil-shaped spring 19 is fitted to its large diameter portion. One end 19a of this spring 19 is inserted into a fitting hole 10a formed in the eccentric bearing 10 and fixed. still,
In order to allow the spherical portion 9a side of the crank pin 9 to pass through the first retainer 11,
A hole 11a is provided in the upper wall.

Reference numeral 20 designates a second link mechanism, which includes a connecting rod 22 whose one end is pivotally connected to the spherical portion 9a of the crank pin 9 via a second retainer 21, and a connecting rod 22 connected to the other end of the connecting rod 22 and connected to the second pivot shaft 6. The second pivot arm 23 is fixed to the second pivot arm 23. In other words, the second link mechanism 20 is pivotally connected to the crank pin 9 via the second retainer 21.
1 and the second pivot shaft 6.
The second retainer 21 is made of synthetic resin and is molded integrally with the connecting rod 22.

As shown in FIGS. 4 and 5, the first retainer 11 has a protrusion 11b formed on its inner circumferential wall, and two protrusions 10b and 10c on the upper surface of the eccentric bearing 10. 11b and 10c
are engaged with each other to restrict the rotation of the eccentric bearing 10 by approximately 180 degrees with respect to the first retainer 11. The coiled spring 19, a protrusion 11b provided on the inner circumferential wall of the first retainer 11, and two protrusions 10b, 1 provided on the upper surface of the eccentric bearing 10.
0c, the relative position of the eccentric bearing 10 to the first retainer is reversed by rotating the eccentric bearing 10 and the first retainer 11 by a predetermined angle (approximately 180 degrees) only at the initial stage of forward rotation and reverse rotation of the wiper motor 7. A position reversing means 23 is configured to cause the

In the above configuration, when the wiper is stopped as shown in FIGS. 1 and 5, the eccentric bearing 10 and the first
The relative positional relationship with the retainer 11 is as shown in FIG. 5, and the center of the eccentric bearing 10 is located at the crank pin 9.
The connecting rod 13 is moved toward one end (the left side in FIG. 5) by the eccentricity ε of the eccentric bearing 10 from the center of the eccentric bearing 10, and the effective length of the connecting rod 13 that forms part of the first link mechanism 12 is (L ₁ - ε). or,
The effective length of the connecting rod 22 forming part of the second link mechanism 20 is _L2 . When a wiper switch (not shown) is turned on to operate the wiper from the stopped state, the wiper motor 7 rotates in the forward direction, and the crank arm 8, whose one end is fixed to the output shaft 7a, rotates in the direction of arrow B in FIG. 5. Here, a coiled spring 19 is fitted to the large diameter portion of the crank pin 9, and one end 19a of the spring 19 is inserted into the fitting hole 10a of the eccentric bearing 10 and fixed. At the beginning of forward rotation, the eccentric bearing 10 slides and rotates integrally with the crank pin 9 between the eccentric bearing 10 and the first retainer 11, and after rotating approximately 180 degrees, the eccentric bearing 10 rotates as shown in FIG. The formed protrusion 10c is the first retainer 11
Thereafter, the eccentric bearing 10 and the first retainer 11 slide and rotate continuously between the crank pin 9 and the eccentric bearing 10 as a unit. Incidentally, since this rotation direction is in the direction in which the spring 19 is loosened, the load generated between the crank pin 9 and the spring 19 is small. In other words, the wiper motor 7 is
The eccentric bearing 10 and the first retainer 11 are rotated by a predetermined angle (approximately 180 degrees) only at the initial stage of normal rotation, and as a result, the center of the eccentric bearing 10 is less than the center of the crank pin 9 due to the eccentricity of the eccentric bearing 10. The other end of the connecting rod 13 by the amount ε (right side in Fig. 4)
, the effective length of connecting rod 13 is (L ₁ +ε)
becomes. Therefore, as shown in FIG. 2, the inward reversal position of the upper blade 1 is located above the stop position indicated by the two-dot chain line by an angle α. Here, since the effective length _L2 of the connecting rod 22 does not change, the inward reversal position of the lower blade 2 remains the same as the stop position shown in FIG. Therefore, even if the upper blade 1 is reciprocated with approximately the same wiping angular velocity as the lower blade 2, it is possible to avoid collision between the two blades 1 and 2 within the common wiping range near the inward reversal position. can.

Next, when the wiper switch is turned off to stop the wiper, the wiper motor 7 rotates in the reverse direction, and the crank arm 8 rotates in the direction of arrow C in FIG. 4.
At the beginning of the reverse rotation of the motor 7, the eccentric bearing 10
is integrated with the crank pin 9 and the eccentric bearing 10
and the first retainer 11, and after rotating approximately 180 degrees, the other protrusion 10 is rotated as shown in FIG.
b engages with the protrusion 11b, the eccentric bearing 10 and the first retainer 11 are integrated, and the spring 1
Crank pin 9 and eccentric bearing 1 resist the tightening force of 9.
It slides and rotates between 0 and 0. That is, the position reversing means 23 rotates the eccentric bearing 10 and the first retainer 11 by a predetermined angle (approximately 180 degrees) only at the initial stage of the wiper motor 7 reversing. 5, the effective length of the connecting rod 13 becomes (L ₁ -ε). In addition, the effective length of conrod 22
L ₂ remains the same. Therefore, as shown in FIG. 1, the upper blade 1 is then stopped at a predetermined stop position, which is an angle α below the inward reversal position when the wiper is activated, by a fixed position stop mechanism (not shown), and the lower blade 2 is stopped at a predetermined stop position, as shown in FIG. It stops at a predetermined stop position, which is the inward reversal position during operation.

As described above, in this embodiment, the eccentric bearing 10 pivotally connected to the crank pin 9 is reversed by the simply configured position reversing means 23 only at the beginning of the forward and reverse rotations of the wiper motor 7. The effective length of the first link mechanism 12 is made long to (L ₁ +ε) when the wiper is in operation, and shortened to (L ₁ -ε) when the wiper is stopped, thereby minimizing changes in the wiping angular velocity near the reversal position of both blades 1 and 2. However, since the wiper device avoids collision between the blades 1 and 2 within the common wiping range, it is no longer necessary to incorporate a complicated clutch mechanism into the deceleration section of the wiper motor as in conventional devices. Therefore, the number of parts is reduced, and the wiper motor 7 can be made smaller, which has the effect of making the wiper device less expensive as a whole. Also, link mechanisms 12, 2
The arrangement of the link mechanisms 12 and 20 has the effect of simplifying the arrangement and improving the degree of freedom in the arrangement of the link mechanisms 12 and 20, since the arrangement of the link mechanisms 12 and 20 is not constrained by the directionality as in conventional devices.

6 to 8 show a second embodiment of the wiper device according to the present invention, and FIGS. 6 and 7 show the wiper device in the second embodiment of the present invention when the wiper is stopped and when the wiper is activated, respectively. FIG. 8, which is an explanatory view showing the operating state, is a partial longitudinal cross-sectional view showing the main parts of the wiper device in the second embodiment of the present invention.

In this embodiment, the first link mechanism 32 is connected to a connecting rod 33 whose one end is pivotally connected to the eccentric bearing 10 via the first retainer 11, and whose one end is connected to the first pivot shaft 5.
The first pivot arm 16 is fixed to the connecting rod 33 and the other end is connected to the other end of the connecting rod 33, and the spherical part 9a and the shaft part 9b of the crank pin 9 fixed to the other end of the crank arm 8 are separated. , one end of the lead arm 34 is fixed to the shaft part 9b, and the spherical part 9a is fixed to the other end of the lead arm 34, and the connecting rod 22 constituting a part of the second link mechanism 20 is cranked via the second retainer 21. It is pivotally connected to the spherical portion 9a of the pin 9. Other configurations are the same as in the first embodiment.

In this second embodiment, the relative positional relationship between the eccentric bearing 10 and the first retainer 11 when the wiper is stopped is as shown in FIG.
The center of the connecting rod 33 is moved toward one end of the connecting rod 33 by an eccentric amount ε from the center of the shaft portion 9b of the crank pin 9, and the effective length of the connecting rod 33 is set as (L ₃ +ε). When the wiper is operated from this wiper stop state, the relative position of the eccentric bearing 10 with respect to the first retainer 11 is reversed by the position reversing means 23 in the same way as in the first embodiment, and the effective length of the connecting rod 33 is (L ₃ +ε ). Therefore, as shown in FIG. 7, the inward reversal position of the upper blade 1 is located above the stop position indicated by the two-dot chain line by an angle α. Note that the effective length of the conrod 22 is the first
As in the embodiment, the inward reversal position of the lower blade 2 remains the same as the rest position shown in FIG.
When the wiper is stopped, the same operation as in the first embodiment is performed, and the effective length of the connecting rod 33 becomes (L ₃ +ε), and the wiper stops at a predetermined stop position shown in FIG.

Therefore, this second embodiment also has the same effects as the first embodiment described above, and the structure of the first link mechanism is simpler than that of the first embodiment, making the arrangement of the link mechanism even easier.

As described above, the present invention uses a simply configured position reversing means to reverse the eccentric bearing pivotally connected to the crank pin only at the initial stages of normal rotation and reverse rotation of the wiper motor. By changing the effective length of the link mechanism,
The number of parts is reduced because the wiper device can avoid collision between the two blades within their common wiping range even if the change in the wiping angular velocity near the reversal position of the two blades that operate in opposition to each other is minimized. At the same time, the wiper motor can be downsized, resulting in an inexpensive wiper device. Further, the arrangement of the link mechanism becomes simple and the degree of freedom of arrangement of the link mechanism is improved.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams showing the operating states of the wiper device according to the first embodiment of the present invention when the wiper is stopped and when the wiper is activated, respectively, and FIG. 3 is an explanatory diagram of the wiper device according to the first embodiment of the present invention. FIGS. 4 and 5 are partial vertical sectional views showing the main parts of the wiper motor.
The A-line sectional view, FIGS. 6 and 7 are explanatory diagrams showing the operating states of the wiper device in the second embodiment of the present invention when the wiper is stopped and when the wiper is activated, respectively, and FIG. 8 is the second embodiment of the present invention. FIG. 2 is a partial vertical cross-sectional view showing the main parts of the wiper device in the example. DESCRIPTION OF SYMBOLS 1... Upper blade, 2... Lower blade, 5... First pivot axis, 6... Second pivot axis, 7... Wiper motor, 7a... Output shaft, 8...
...Crank arm, 9...Crank pin, 10...
... Eccentric bearing, 11 ... First retainer, 12, 32
...first link mechanism, 20...second link mechanism,
21...Second retainer, 23...Position inversion means.

Claims (1)

[Scope of utility model registration request] When the wiper is in operation, it rotates in the forward direction, and when the wiper is stopped, it rotates in the reverse direction, and then stops at a predetermined stop position.A single wiper motor that can rotate in forward and reverse directions rotates the wiper motor in the upper and lower directions, which operate in opposition to each other and overlap at the stop position. In a wiper device equipped with a blade, a first pivot shaft and a second pivot shaft for reciprocating the upper blade and the lower blade, respectively, one end of which is fixed to the output shaft of the wiper motor, and a crank pin fixed to the other end. an eccentric bearing pivotally connected to the crank pin; a first link mechanism pivotally connected to the eccentric bearing via a first retainer and connecting the first retainer and the first pivot shaft; a position reversing means that rotates the eccentric bearing and the first retainer by a predetermined angle only at the initial stage of forward rotation and reverse rotation of the wiper motor to reverse the relative position of the eccentric bearing with respect to the first retainer; A wiper device comprising: a second link mechanism pivotally attached to the crank pin and connecting the second retainer and the second pivot shaft.