JPH05238356A - Wiper device - Google Patents

Abstract

PURPOSE:To suppress generation of chatter and return noise of a blade rubber by a method wherein a wiping speed in the stop position or in a position near the return position of the blade rubber is reduced to a value lower than that in an intermediate position by means of a rotation speed regulating mechanism. CONSTITUTION:In a quadric link mechanism 8 serving as a rotation speed regulating mechanism, when a rotary shaft 15 is rotated, a rotary lever 11 is rotated, a coupling plate 14 is rocked, and a rotary lever 12 is rotated around a rotary shaft 10 serving as a fulcrum. In which case, a connection lever 5 is rotated through a coupling pin 16 and a connection link 17 and a wiper arm 3 is reciprocated. In this case, the coupling pin 16 draws an oval locus and when the coupling pin 16 is moved to the major axis part of the oval locus, the rotation angle of the coupling pin 16 is reduced. In this case, a wiper blade 4 is moved to a stop or a return position and the rotation speed of the connection lever 5 is decreased. When the coupling pin 16 is moved to the minor axis part of the oval locus, the wiper blade 4 is situated in the middle between a stop and a return, the rotation angle of the coupling pin 16 is increased, and the speed of the connection lever 5 is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper device, and more particularly to a wiper device which prevents vibrations generated when a blade rubber of a wiper arm is wiping a windshield.

[0002]

2. Description of the Related Art In a conventional wiper device, as shown in FIG. 12, when a rotary shaft 40 supported by a wiper motor (not shown) rotates, a rotary lever 50a causes a rotary shaft 40 to rotate.
Rotate around. Then, the rotating lever 50b reciprocally rotates the rotating lever 53 fixed to the pivot shaft 52. In addition, the reciprocating rotation of the rotating lever 53 causes the rotating lever 55 fixed to the pivot shaft 52 via the rod 54 to reciprocate. With this configuration, the wiper arms 56 fixed to the respective pivot shafts 52 reciprocate, and the blade rubber 57 of the wiper arm 56 wipes the wind glass 58 to secure the field of view of the wind glass 58.

[0003]

However, when the wiper arm 56 is reciprocated by driving the wiper motor, chatter occurs due to the sliding of the blade rubber 57 and the window glass 58, and the blade rubber 57 stops at the stop position. When the inversion position is reached, the blade rubber 5
A reversing sound is generated when 7 is reversed.

As a means for solving these problems, it is considered that the rigidity of the arm blade supporting the blade rubber 57 is improved or the shape of the blade rubber 57 is changed to suppress the chattering of the blade rubber 57. There is. However, there is a problem in that the improvement of the rigidity of the arm blade causes an increase in weight and there is a limit in changing the shape of the blade rubber 57.

The present invention has been made to solve the above problems, and an object thereof is to provide a wiper device capable of suppressing chatter of the blade rubber and reversal sound of the blade rubber.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a wiper device for reciprocating a wiper arm about a support shaft, wherein the wiper arm reciprocates about the support shaft. The connecting lever to move,
When the blade rubber of the wiper arm is wiping, the wiping speed when the wiper arm reaches the stop position or the reversal position is about the middle position between the stop position and the reversal position. The gist of the invention is to connect a rotation speed adjusting mechanism for changing the rotation speed of the connection lever so as to be lower than the wiping speed.

According to a second aspect of the present invention, the rotation speed adjusting mechanism is the first four-bar linkage mechanism, and the rocking links are respectively connected to the two moving joints of the first four-bar linkage mechanism, and the respective rocking mechanisms are connected. The gist of the invention is that the tips of the moving links are connected to each other and the tips of the swing links that are connected to each other are connected to the connection lever via the connection links.

According to a third aspect of the present invention, the rotation speed adjusting mechanism is a planetary gear mechanism in which the radius ratio of the planetary gear and the sun gear is 1: 2, and the connecting rod provided on the planetary gear of the planetary gear mechanism is used. The main point is that the connection lever is connected.

According to a fourth aspect of the present invention, the rotation speed adjusting mechanism is a cam mechanism, and a guide pin that slides along an endless guide groove provided on the cam of the cam mechanism is connected to the connecting lever. Is the gist.

According to a fifth aspect of the present invention, a rotary lever is connected to a connecting lever via a connecting link to form a second four-bar linkage mechanism, and a universal joint is connected to an input shaft of the second four-bar linkage mechanism. The gist of the present invention is that a rotation speed adjusting mechanism is configured by connecting a rotation shaft and making a driving shaft of the universal joint inclined with respect to the rotation shaft.

According to a sixth aspect of the present invention, a rotary lever is connected to a connecting lever via a connecting link to form a second four-bar linkage mechanism, and both crank mechanisms are provided with respect to the input shaft of the second four-bar linkage mechanism. The gist is that the rotation speed adjusting mechanism is configured by connecting the rotation shafts of the shortest links constituting the.

[0012]

In the first aspect of the invention, the connection lever is rotated and the wiper arm reciprocates by operating the rotation speed adjusting mechanism. Then, the rotation speed adjusting mechanism adjusts the wiping speed when the blade rubber of the wiper arm reaches the stop position and the reversal position so as to be lower than the wiping speed at the intermediate position between the stop position and the reversal position. Since the rotation speed is adjusted, the reverse sound of the blade rubber is prevented. Further, since the wiping speed is accelerated toward the intermediate position and is decreased from the intermediate position toward the stop position or the reversal position, the wiper arm smoothly rotates.

In the second aspect of the invention, when the first four-joint link mechanism which constitutes the rotation speed adjusting mechanism is operated, the swing link connected to the two movable joints through the first four-joint link mechanism. Works. At this time, the locus of the tips of the swing links connected to each other is an elliptical locus. Since the connection lever rotates based on this locus, the reciprocating speed distribution of the wiper arm can be changed. Therefore, the reverse sound of the blade rubber is prevented and the wiper arm smoothly rotates.

In the third aspect of the invention, when the planetary gear of the planetary gear mechanism constituting the rotation speed adjusting mechanism is revolved around the sun gear while revolving around the sun gear, the planetary gear and the sun gear are connected at a radius ratio of 1: 2. The rod reciprocates through the center point of the sun gear. Since the connecting lever is rotated by this connecting rod, the reciprocating speed distribution of the wiper arm can be changed. Therefore, the reverse sound of the blade rubber is prevented and the wiper arm smoothly rotates.

In the fourth invention, when the cam of the cam mechanism constituting the rotation speed adjusting mechanism is rotated, the guide pin slides along the endless guide groove provided in the cam. Since the connection lever is rotated based on the sliding of the guide pin, the reciprocating speed distribution of the wiper arm can be changed. Therefore, the reverse sound of the blade rubber is prevented and the wiper arm smoothly rotates.

In the fifth aspect of the present invention, when the driving shaft of the universal joint constituting the rotation speed adjusting mechanism is rotated, the rotating shaft and the input shaft rotate and the second four-bar linkage mechanism operates. Therefore, the connection lever rotates and the wiper arm reciprocates. Further, since the driving shaft has an inclination with respect to the rotation shaft, even if the driving shaft rotates at a constant speed, the rotation shaft rotates at a non-uniform speed. The velocity distribution of the reciprocating motion of the arm can be changed. Therefore, the reverse sound of the blade rubber is prevented and the wiper arm smoothly rotates.

In the sixth aspect of the present invention, when both crank mechanisms constituting the rotation speed adjusting mechanism are operated, the input shaft rotates via the rotary shaft of the shortest link and the second four-bar linkage mechanism operates. Therefore, the connection lever rotates and the wiper arm reciprocates. Further, since the operation of both crank mechanisms is a rotational movement that periodically fluctuates, the rotational speed of the connection lever changes, and the reciprocating speed distribution of the wiper arm can be changed. Therefore, the reverse sound of the blade rubber is prevented, and the wiper arm rotates smoothly.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment embodying the present invention will now be described with reference to FIG.
~ It demonstrates according to FIG. As shown in FIG. 1, a pair of pivot shafts 2a and 2b as support shafts are rotatably provided on a main body 1 of a vehicle, and wiper arms 3 are fixed to the pivot shafts 2a and 2b, respectively. A wiper blade 4 composed of a blade arm and a blade rubber is provided at the tip of the wiper arm 3. The windshield W of the main body 1 is wiped by the wiper blade 4.

A connecting lever 5 is fixed to the pivot shaft 2a, and a rotating lever 6 is fixed to the pivot shaft 2b. A rod 7 is connected to the tip of the rotating lever 6 and is connected to the center of the connecting lever 5. Therefore, the wiper arm 3 connected to the pivot shafts 2a and 2b is integrally rotated by the rod 7.
The pair of wiper arms 3 are reciprocally moved by a first four-bar linkage mechanism 8 as a rotation speed adjusting mechanism.

Next, the structure of the first four-bar linkage 8 for reciprocating the pair of wiper arms 3 will be described. As shown in FIGS. 1 and 2, a rotary shaft 9 and a rotary shaft 10 are provided at predetermined intervals on the main body 1 that constitutes the fixed joint of the first four-bar linkage mechanism 8. A rotary lever 11 is fixed to the rotary shaft 9, and a rotary lever 12 longer than the rotary lever 11 is fixed to the rotary shaft 10. The rotating lever 11 and the rotating lever 1
The tip ends of the two are connected to each other by a connecting plate 14 which is formed in a substantially triangular shape and constitutes a swinging link via a pin 13 serving as a movable joint.

A rotary shaft 15 of a wiper motor (not shown) that rotates at a constant speed is connected to the rotary shaft 9, and the rotary lever 11 is rotated in the clockwise direction via the rotary shaft 9. The rotation of the rotating lever 11 causes the connecting plate 14 to swing, and the tip of the rotating lever 12 rotates about the rotating shaft 10. Further, the rotary lever 11, the rotary lever 12, and the connecting plate 14 constitute a crank mechanism.

A connecting pin 16 is provided on the connecting plate 14.
One end of the connecting link 17 is swingably connected via. The other end of the connecting link 17 is connected to the tip of the connecting lever 5 via a connecting pin 18.

When the rotary shaft 15 rotates clockwise, the rotary lever 11 rotates and the connecting plate 14 swings. Therefore, the rotating lever 12 rotates about the rotating shaft 10 as a fulcrum. At this time, the locus of the connecting pin 16 provided on the connecting plate 14 is elliptical. Then, when the connecting pin 16 reaches the major axis portion of the elliptical locus, the wiper blade 4
Reaches the stop position or the reverse position and the connecting pin 16 reaches the short axis part of the elliptical locus so that the wiper blade 4 reaches the intermediate position between the stop position and the reverse position.

Therefore, when the rotary shaft 15 rotates, the first four-bar linkage mechanism 8 causes the connecting lever 5 to move through the connecting link 17.
Rotate. Then, when the connecting pin 16 reaches the major axis portion of the elliptical locus, that is, when the wiper blade 4 reaches the stop position or the reverse position, the rotation angle of the connecting pin 16 with respect to the uniform rotation of the rotating shaft 15. Is small, the rotation speed for rotating the connection lever 5 via the rod 7 is small.

When the connecting pin 16 reaches the short axis portion of the elliptical locus, that is, when the wiper blade 4 reaches the intermediate position between the stop position and the reverse position, the rotary shaft 1
Since the rotation angle of the connecting pin increases with respect to the rotation of 5 at a constant speed, the rotation speed for rotating the connection lever 5 via the rod 7 increases.

As a result, the rotation speed of the connection lever 5, that is, the rotation speed of the wiper blade 4 has a waveform as shown by the solid line in FIG. That is, the rotation speed when the wiper blade 4 starts wiping from the stop position or the reversal position is slower than the constant speed of the rotating shaft 15, and the rotation speed rapidly increases toward the intermediate position. .. Further, the rotation speed of the wiper blade 4 rapidly decreases from the intermediate position to the stop position or the reversal position, and the rotation speed of the wiper blade 4 in the vicinity of reaching the stop position or the reversal position is the rotation axis 15 It is slower than the speed.

Next, the operation of the wiper device constructed as described above will be described. As shown in FIGS. 1 and 2,
When the rotary shaft 15 is rotated clockwise at a constant speed by a wiper motor (not shown), the rotary lever 1 is rotated via the rotary shaft 9.
1 rotates at a constant speed. Therefore, the connecting plate 14 swings, and the tip of the rotating lever 12 reciprocally rotates about the rotating shaft 10 as a fulcrum by the swinging of the connecting plate 14. When the rotating lever 11 makes one rotation and the connecting plate 14 swings,
The connecting pin 16 of the connecting plate 14 draws an elliptical locus.

Therefore, the connecting pin 16 and the connecting link 17
The rotational speed distribution of the connection lever 5 connected to the connecting plate 14 via the is shown by the solid line in FIG. 3, and the rotational speed distribution of the rotary shaft 15 is shown by the dotted line. Therefore, the wiper blade 4
When the wiper starts wiping from the stop position or the reverse position, or when the wiper blade 4 reaches the stop position or the reverse position, the rotation speed of the wiper blade 4 becomes slower than the rotation speed of the rotary shaft 15.

Further, when the wiper blade 4 reaches the intermediate position between the stop position and the reverse position, the rotation speed of the wiper blade 4 rapidly increases, and the rotation of the wiper blade 4 after passing the intermediate position. The speed decreases sharply.

As a result, when the wiper blade 4 reaches the stop position or the reversal position, the rotation speed of the wiper blade 4 is reduced (slow), so that the collision noise of the blade rubber of the wiper blade 4 colliding with the windshield W and ,
It is possible to suppress the reverse sound of the blade rubber.

Further, for example, when the wiper blade 4 starts the wiping operation to reach the intermediate position, the rotational speed of the wiper arm 3 is rapidly increased. Therefore, the wiper rubber of the wiper blade 4 and the windshield W
The wiper blade 4 wipes with a water film interposed therebetween. As a result, direct contact between the wiper blade and the windshield W is prevented and sliding resistance does not increase, so that the occurrence of chattering of the wiper blade 4 in the wiper arm 3 can be suppressed. Even in the wiper blade 4 that has passed through the intermediate position, the occurrence of chatter can be suppressed for the same reason as above.

Further, since the locus of the connecting pin 16 for rotating the connecting lever 5 can be made elliptical by the first four-bar linkage 8, the speed distribution of the wiper blade 4 can be partially calculated based on this elliptic locus. Sound of the wiper blade 4, a reversing sound, and the wiper blade 4
It is possible to suppress the occurrence of chattering.

In this embodiment, the vehicle is embodied,
It can be applied to all vehicles equipped with a wiper device. [Second Embodiment] Next, a second embodiment of the present invention will be described. The same members as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 4, in the second embodiment, the connecting lever 5 is provided with a planetary gear mechanism 20 as a rotation speed adjusting mechanism.
Is different from the above embodiment. The structure of the planetary gear mechanism 20 will be described. As shown in FIGS. 5 and 6, a bottomed cylindrical case 21 is formed in the vehicle body 1 via a mounting bracket (not shown), and an upper inner peripheral surface of the case 21 is formed. A fixed gear 22 as a sun gear is formed. Further, a drive motor 23 is arranged at the center of the bottom surface of the case 21,
A drive gear 25 is provided on a drive shaft 24 of the drive motor 23.

A first planetary gear 26 is meshed with the drive gear 25, and the first planetary gear 26 has a connecting shaft 27.
Is connected to the second planetary gear 28 via. The second
The planetary gear 28 is meshed with the fixed gear 22 of the case 21. The diameter of the second planetary gear 28 and the inner diameter of the fixed gear 22 are 1: 2. That is, it constitutes a trochoidal gear. Then, the second planetary gear 28
A connecting rod 29 is erected and fixed on the upper side surface of the connecting rod 29.
Is connected and fixed to the center of the connecting lever 5. A pair of guide plates 3 are provided above the case 21 so as to pass through the center of the case 21 and sandwich the connecting rod 29.
0 is stuck.

When the drive shaft 24 and the drive gear 25 are rotated by the drive of the drive motor 23, the first and second planetary gears 26 and 28 revolve around the drive gear 25 while rotating about their axes. At this time, the connecting rod 29 of the second planetary gear 28 linearly reciprocates along the pair of guide plates 30 due to the characteristics of the planetary gear mechanism. Therefore, the connecting lever 5 is rotated about the pivot shaft 2a by the linear reciprocating movement of the connecting rod 29, and the wiper blade 4 of the wiper arm 3 is rotated by the windshield W.
Wipe off. Further, the connecting position of the connecting rod 29 to the connecting lever 5 is previously connected to the connecting lever 5, that is, where the rotation speed of the wiper blade 4 is indicated by the solid line in FIG.

Therefore, the drive motor 23 drives the second
Since the moving speed of the connecting rod 29 when the planetary gear 28 revolves around the drive gear 25 while revolving around the drive gear 25 is similar to that of the above-described embodiment, the rotating speed of the wiper blade 4 can be partially changed. .. As a result, similarly to the above-described embodiment, the rotation speed when the wiper blade 4 starts wiping from the stop position or the reversal position and when the wiper blade 4 is about to reach the stop position or the reversal position can be reduced. Therefore, the reversal sound and the collision sound can be suppressed. In addition, the rotation speed when the wiper blade 4 moves toward the intermediate position can be rapidly increased, and the rotation speed when the wiper blade 4 moves from the intermediate position to the stop position or the reverse position can be rapidly decreased. Therefore, the occurrence of chattering of the wiper blade 4 can be suppressed.

[Third Embodiment] Next, a third embodiment of the present invention will be described. The same members as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 7, the third embodiment is different from the above-described embodiment in that the connection lever 5 is provided with a cam mechanism 31 as a rotation speed adjusting mechanism. Explaining the configuration of the cam mechanism 31, a columnar cam 32 connected to a drive motor (not shown) is disposed so as to be rotatable in the horizontal direction. An endless guide groove 33 is formed on the outer peripheral surface of the cam 32. This guide groove 33 has the same shape as the waveform shown by the solid line in FIG. The tip of a guide pin 34 connected to the center of the connecting lever 5 is inserted into the guide groove 33.

Therefore, when the cam 32 is rotated at a constant speed by a drive motor (not shown), the guide pin 34 moves the guide groove 3
3 along with the connection lever 5 based on the amount of movement.
Rotates. As a result, similar to the above-described embodiment, the rotation speed when the wiper blade 4 starts wiping from the stop position or the reversal position and when the wiper blade 4 is about to reach the stop position or the reversal position can be reduced. Therefore, the reversal sound and the collision sound can be suppressed. or,
The rotation speed when the wiper blade 4 moves toward the intermediate position can be rapidly increased, and the rotation speed when the wiper blade 4 moves from the intermediate position to the stop position or the reverse position can be rapidly decreased. Therefore, the occurrence of chatter of the wiper blade 4 can be suppressed.

Although the cam 32 is embodied in a cylindrical shape,
As shown in FIG. 9, it is possible to change the shape of the cam 32 so that the central body portion is curved inward. In this case, the guide groove 33 may be formed so as to have a sine wave. Therefore, the moving speed of the guide pin 34 is faster near the central body portion and slower at both end portions. As a result, since the rotation speed of the connection lever 5 can be set as shown by the solid line in FIG. 3, it is possible to suppress the reverse sound of the wiper blade 4, the collision sound, and the chattering of the hyper blade 4. ..

[Fourth Embodiment] Next, a fourth embodiment of the present invention will be described. The same members as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 10 (a), in this embodiment, the rotary shaft 4 as the input shaft of the conventional wiper device is used.
It differs from the above-mentioned embodiment in that a universal joint mechanism 41 as a rotation speed adjusting mechanism is connected to 0.
The universal joint mechanism 41 has the rotary shaft 40.
To the universal joint 42.
As shown in FIG. 10B, the rotary shaft 43 of the universal joint 42 is in a state perpendicular to the rotary shaft 40 (see FIG.
0 (a) is connected obliquely for convenience of drawing), and the rotary shaft 43 is connected to a driving shaft 45 via a joint portion 44. The driving shaft 45 has an inclination angle α of 30 ° or more with respect to the rotating shaft 43.

Therefore, even if the drive shaft 45 is rotated at a constant speed by a drive motor (not shown), the drive shaft 45 has an inclination angle α with respect to the rotation shaft 43, so that the rotation shaft 43 is shown by the solid line in FIG. Will rotate at an unequal speed indicated by.

As a result, it is possible to suppress the reversal sound and the collision sound of the wiper blade 4 and the chattering of the wiper blade 4 as in the above embodiment. In the fourth embodiment, the rotating shaft 40 is rotated by the universal joint 42 so as to have an unequal speed.
As shown in FIG. 1 (a), it is also possible to connect both crank mechanisms 47 forming a second four-bar linkage mechanism as a rotation speed adjusting mechanism to the rotary shaft 40.

That is, as shown in FIGS. 11 (a) and 11 (b), the support shaft 48 as a rotating shaft in both crank mechanisms 47 constituted by fixing the shortest link 46 to the rotating shaft 40 has the same axis. And are connected to each other (in FIG. 11A, they are obliquely shown for convenience). When the support shaft 49 of both crank mechanisms 47 is rotated at a constant speed by a drive motor (not shown), the rotary levers 50 and 51 rotate around the support shafts 48 and 49, respectively. At this time,
Since both crank mechanisms 47 have a rotational movement that fluctuates periodically, the rotation shaft 40 has an unequal speed as shown by the solid line in FIG.

As a result, it is possible to suppress the reversing sound and the collision sound of the wiper blade 4 and suppress the chattering of the wiper blade 4 as in the above embodiment. [Fifth Embodiment] Next, a fifth embodiment of the present invention will be described. The same members as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 13, a motor device 60 as a rotation speed adjusting mechanism is arranged on the lower left side of the window glass W, and the output shaft 61 of the motor device 60 has one wiper arm 3 and The connection lever 62 is connected and fixed. One end of the rod 7 is swingably connected to the tip of the connecting lever 62, and the other end of the rod 7 is connected to the connecting lever 63. The base end of the connecting lever 63 is connected to the pivot shaft 2b to which the other wiper arm 3 is connected.

Therefore, the output shaft 61 of the motor device 60
When is rotated, the wiper blade 4 is rotated via the connecting lever 62 and one wiper arm 3. Further, since the rod 7 swings in the horizontal direction by the rotation of the connecting lever 62, the connecting lever 63 rotates. Therefore, the pivot shaft 2b rotates and the wiper blade 4 rotates via the wiper arm 3. As a result, the windshield W is wiped by the pair of wiper blades 4.

Next, the structure of the motor device 60 will be described. As shown in FIGS. 14 and 15, the motor device 6
A housing 66 is attached and fixed to the left side portion of the motor 65 that constitutes 0. The shaft 67 of the motor 65 is horizontally inserted into the housing 66. A worm 68 is formed on the shaft 67.

The shaft 6 is provided in the housing 66.
A wheel gear 69 that meshes with the worm 68 of No. 7 is provided. A support rotary shaft 70 is formed at the center of the back surface of the wheel gear 69. The support rotary shaft 70 is inserted into the housing portion 71 of the housing 66. Therefore, the wheel gear 69 is rotatably supported with respect to the housing 66.

A rotating plate 72 is connected and fixed to the front surface of the wheel gear 69 so that it can rotate integrally with the wheel gear 69. The rotating plate 72 is rotatably supported with respect to the housing 66 by a bearing 73 arranged in the housing 66.

In the present embodiment, the motor 6
When the shaft 67 rotates by the drive of 5, the worm 68
Is rotated, and the wheel gear 69 and the rotary plate 72 are rotated counterclockwise. 15 and 16
As shown in FIG. 7, a circumferential guide groove 74 having a shape very similar to that of the beans is formed on the front surface of the rotary plate 72. A home position portion 75 is formed in the guide groove 74.

The output shaft 61 is inserted into the housing 66 from the front of the housing 66.
1 is rotatably supported by a bearing 76 with respect to the housing 66.

Output shaft 61 in the housing 66
A rotation plate 77 is connected and fixed to the base end of the so as to be integrally rotatable. A guide pin 78, which is inserted into the guide groove 74 of the rotary plate 72 and has substantially the same size as the width of the guide groove 74, is formed on the back surface of the rotary plate 77.

When the rotary plate 72 rotates counterclockwise by the drive of the motor 65, the guide pin 78
Moves counterclockwise along the guide groove 74. Therefore, the output shaft 61 rotates via the rotating plate 77.
Therefore, the pair of wiper blades 4 wipes the window glass W.

Further, the normal guide pin 78 is stopped at the position of the home position portion 75 of the guide groove 74, and at this time, the pair of wiper blades 4 is positioned at the stop position.

Further, when the rotating plate 72 makes one rotation counterclockwise by the rotation of the wheel gear 69, the guide pin 78 makes one round along the guide groove 74 of the rotating plate 72. At this time, in this embodiment, the output shaft 61 is
As shown in FIGS. 6 to 27 and 28, it is configured to reciprocally rotate between 0 ° and 91 °. Further, when the output shaft 61 reciprocally rotates between 0 ° and 91 °, the pair of wiper blades 4 wipes the wind glass W, and the rotation speed of the pair of wiper blades 4 at this time is as shown in FIG. The guide groove 74 is arranged so that the rotation plate 72 has the characteristics shown in FIG.
Is formed against.

Next, the operation of the motor device 60 configured as described above will be described. As shown in FIG. 16, when the motor 65 is stopped, the guide pin 78 of the rotating plate 77 is positioned at the home position portion 75 of the guide groove 74 of the rotating plate 72. At this time, the pair of wiper blades 4 is in the state of being positioned at the stop position.

When the motor 65 is driven, the wheel plate 69 and the rotary plate 72 rotate counterclockwise. Then, the guide pin 78 of the rotating plate 77 moves counterclockwise along the guide groove 74 of the rotating plate 72.

Then, as shown in FIG.
When the rotary plate 72 rotates by 30 °, the guide pin 78 rotates 8 ° counterclockwise about the output shaft 61. Then, as shown in FIG. 18, when the rotary plate 72 is rotated 60 ° by the motor 65, the guide pin 78 is rotated 25 ° counterclockwise about the output shaft 61. After that, as shown in FIG. 19, when the rotary plate 72 is rotated 90 ° by the motor 65, the guide pin 78 moves the output shaft 6
Rotate 47 degrees counterclockwise around 1.

Subsequently, as shown in FIG. 20, the motor 6
When the rotary plate 72 rotates 120 ° by 5, the guide pin 78 rotates 70 ° counterclockwise about the output shaft 61. Then, as shown in FIG. 21, when the rotary plate 72 is rotated by 150 ° by the motor 65, the guide pin 78 is rotated by 87 ° counterclockwise about the output shaft 61. Further, as shown in FIG. 22, when the rotary plate 72 is rotated 180 ° by the motor 65, the guide pin 78 is rotated 91 ° counterclockwise about the output shaft 61. At this time, the pair of wiper blades 4 are located at the determination position.

Thereafter, as shown in FIG. 23, the motor 65
When the rotary plate 72 rotates by 210 °, the guide pin 78 rotates by 84 ° counterclockwise about the output shaft 61. Then, as shown in FIG. 24, when the rotary plate 72 is rotated by 240 ° by the motor 65, the guide pin 7
8 rotates counterclockwise about the output shaft 61 by 64 °.
Further, as shown in FIG. 25, when the rotary plate 72 is rotated by 270 ° by the motor 65, the guide pin 78 is rotated by 42 ° counterclockwise about the output shaft 61.

As shown in FIG. 26, when the rotary plate 72 is rotated by 300 ° by the motor 65, the guide pin 78 is rotated counterclockwise by 16 ° about the output shaft 61. Then, as shown in FIG. 27, when the rotary plate 72 is rotated 330 ° by the motor 65, the guide pin 78
Rotates counterclockwise about the output shaft 61 by 8 °.

FIG. 28 shows the characteristic indicating the amount of rotation of the output shaft 61 with respect to the rotation of the rotary plate 72. FIG. 28
As can be seen, in the vicinity of the stop position and the reversal position of the wiper blade 4, the change in the rotation amount of the output shaft 61 with respect to the rotation amount of the rotating plate 72 is small. or,
At the intermediate position, the rotation amount of the output shaft 61 with respect to the rotation amount of the rotating plate 72 is large. Further, FIG. 30 shows the velocity distribution of the wiper blade 4. As can be seen from this characteristic, the speed at the stop position and the reversal position of the wiper blade 4 is low, and the speed at the intermediate position is fast. Therefore, the rotation speed of the wiper blade 4 near the stop position and the reversal position is low, and the rotation speed of the wiper blade 4 near the intermediate position can be increased.

As a result, it is possible to suppress the reversing sound and the collision sound of the wiper blade 4 and the chattering of the wiper blade 4 as in the above embodiment. Further, the rotating plate 72 and the rotating plate 77 having the guide groove 74 for changing the rotating speed of the pair of wiper blades 4 can be housed in the housing 66 in a compact manner, and the entire wiper apparatus can be made compact. can do. Furthermore, the rotation speed of the pair of wiper blades 4 can be easily changed with a relatively simple structure.

The guide groove 7 formed in the rotary plate 72
By changing the shape of 4, the rotation speed of the wiper blade 4 and the rotation angle of the wiper blade 4 can be easily changed.

Further, in the fifth embodiment, the motor device 60 is provided for the pair of wiper blades 4, but as shown in FIG. 29, the motor device 60 is provided for one wiper blade 4. May be.

[0069]

As described above in detail, according to the present invention, there is an excellent effect that the chatter of the blade rubber and the reversing sound of the blade rubber can be suppressed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a wiper device according to the present invention.

FIG. 2 is a configuration diagram simply showing a configuration of a wiper device.

FIG. 3 is a characteristic diagram showing a rotation speed of a wiper blade.

FIG. 4 is a configuration diagram showing that a planetary gear mechanism is connected to a connection lever.

FIG. 5 is a partially enlarged plan view showing the configuration of the planetary gear mechanism.

FIG. 6 is a partially enlarged sectional view showing the configuration of a planetary gear mechanism.

FIG. 7 is a configuration diagram showing a cam mechanism connected to a connection lever.

FIG. 8 is a partially enlarged view showing the configuration of a cam mechanism.

FIG. 9 is a partially enlarged plan view showing another example of the cam.

10A is a configuration diagram in which a universal joint mechanism is connected to a wiper device, and FIG. 10B is a plan view of the universal joint.

11A is a configuration diagram in which both crank mechanisms are connected to a wiper device, and FIG. 11B is a partially enlarged plan view showing a state in which both crank mechanisms are connected to a rotation shaft.

FIG. 12 is a configuration diagram showing a conventional wiper device.

FIG. 13 is a configuration diagram of a wiper device according to a fifth embodiment of the present invention.

FIG. 14 is a front view of the motor device.

FIG. 15 is a partial cross-sectional view showing the internal structure of the motor device.

FIG. 16 is an operation diagram showing the position of the guide pin when the rotary plate 72 is stopped.

FIG. 17 is an operation diagram showing that the guide pin rotates about the output shaft 61 by 8 ° when the rotating plate 72 rotates by 30 °.

FIG. 18 is an operation view showing that the guide pin rotates about the output shaft 61 by 25 ° when the rotating plate 72 rotates by 60 °.

FIG. 19 is an operation diagram showing that the guide pin rotates about the output shaft 61 by 47 ° when the rotating plate 72 rotates by 90 °.

FIG. 20 is a diagram showing a state where the rotating plate 72 is rotated by 120 °,
FIG. 11 is an operation diagram showing that the guide pin has rotated about the output shaft 61 by 70 °.

FIG. 21 is a view showing a state where the rotating plate 72 is rotated by 150 °,
FIG. 11 is an operation diagram showing that the guide pin has rotated about the output shaft 61 by 87 °.

FIG. 22 is a view showing that when the rotary plate 72 rotates 180 °,
FIG. 11 is an operation diagram showing that the guide pin has rotated about the output shaft 61 by 91 °.

FIG. 23 is a plan view showing that when the rotary plate 72 rotates 210 °,
FIG. 9 is an operation diagram showing that the guide pin has rotated about the output shaft 61 by 84 °.

FIG. 24 is a perspective view showing the rotation plate 72 rotated by 240 °,
FIG. 11 is an operation diagram showing that the guide pin rotates by 64 ° around the output shaft 61.

FIG. 25 is a view showing that when the rotating plate 72 is rotated by 270 °,
FIG. 11 is an operation diagram showing that the guide pin has rotated 42 ° around the output shaft 61.

FIG. 26 is a plan view showing that the rotary plate 72 is rotated by 300 °,
FIG. 11 is an operation diagram showing that the guide pin has rotated about the output shaft 61 by 16 °.

FIG. 27 is a view showing that when the rotating plate 72 is rotated by 330 °,
FIG. 11 is an operation diagram showing that the guide pin rotates about the output shaft 61 by 8 °.

FIG. 28 shows the output shaft 6 with respect to the rotation amount of the rotating plate 72.
It is a characteristic view which shows the amount of rotations of 1.

FIG. 29 is a configuration diagram showing another example of the fifth embodiment.

FIG. 30 is a characteristic diagram showing the velocity distribution of the wiper blade of the fifth example.

[Explanation of symbols]

2a, 2b ... Pivot shaft as support shaft, 3 ... Wiper arm, 4 ... Blade rubber, 5 ... Connection lever, 8 ... First four-bar linkage mechanism as rotation speed adjusting mechanism, 13 ...
Connecting pin as a joint, 14 ... Connecting plate as a swinging link, 17 ... Connecting link, 20 ... Planetary gear mechanism as a rotation speed adjusting mechanism, 22 ... Fixed gear as a sun gear, 2
8 ... Planetary gear, 29 ... Connecting rod, 31 ... Cam mechanism as rotation speed adjusting mechanism, 32 ... Cam, 33 ... Guide groove, 34 ...
Guide pin, 40 ... Rotating shaft as input shaft, 41 ... Universal joint mechanism as rotation speed adjusting mechanism, 42
... universal joint, 43 ... rotary shaft, 45 ... driving shaft, 46 ... shortest link, 47 ... both crank mechanism as rotation speed adjusting mechanism, 48 ... support shaft, α ... tilt angle, 60 ... as rotation speed adjusting mechanism Motor device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Wataru Sakamoto Wataru 390 Umeda, Kosai City, Shizuoka Prefecture Asmo Co., Ltd. (72) Inventor Hiraki Hakoki 390 Umeda Kozu City, Shizuoka Prefecture Asmo Co., Ltd. (72) Inventor Nobuyoshi Morita 265 at 192, Wago-cho, Hamamatsu City, Shizuoka Prefecture

Claims (6)

[Claims] 1. A wiper device for reciprocating a wiper arm provided with a blade rubber about a support shaft, wherein a wiper arm wipes a connection lever for reciprocating the wiper arm about a support shaft. When
The connection lever is set so that the wiping speed when the blade rubber of the wiper arm reaches the stop position or the reversal position is lower than the wiping speed when the vicinity of the intermediate position between the stop position and the reversal position is wiped. A wiper device comprising a rotation speed adjusting mechanism for changing the rotation speed of the wiper device. 2. The rotation speed adjusting mechanism is a first four-bar linkage, wherein two rocking links of the first four-bar linkage are respectively connected with rocking links, and each rocking link is connected. 2. The wiper device according to claim 1, wherein the tip ends of the rocking links are connected to each other, and the tip ends of the swing links connected to each other are connected to the connection lever via the connection link. 3. The rotation speed adjusting mechanism is a planetary gear mechanism in which a radius ratio between a planetary gear and a sun gear is 1: 2,
The wiper device according to claim 1, wherein a connecting rod provided on a planetary gear of the planetary gear mechanism is connected to the connecting lever. 4. The rotation speed adjusting mechanism is a cam mechanism, and a guide pin that slides along an endless guide groove provided in the cam of the cam mechanism is connected to the connecting lever. The wiper device according to claim 1. 5. A rotary lever of a universal joint is connected to an input shaft of the second four-bar linkage mechanism by connecting a rotary lever to the connection lever via a connection link. 2. The wiper device according to claim 1, wherein the rotating shaft adjusting mechanism is configured by connecting the driving shaft of the universal joint to the rotating shaft with an inclination angle with respect to the rotating shaft. 6. A rotation lever is connected to the connection lever via a connection link to form a second four-bar linkage mechanism, and both crank mechanisms are arranged with respect to the input shaft of the second four-bar linkage mechanism. 2. The wiper device according to claim 1, wherein the rotation speed adjusting mechanism is configured by connecting the rotation shafts of the shortest links.