JPH11240423A - Wiper unit for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper unit for a vehicle that not only expands the wiper range by being a four joint link type, but also in which the wiper arm action is smooth and thereby not irritating to the passengers by a main lever, a sub lever and an arm head. SOLUTION: The wiper for a vehicle is a four link type in which a main lever 14 and a sub lever 16 are connected to an arm head 24. The rotation angle range of the main lever 14 is set such that the rotation angle speed of a wiper arm 12 is in a range of 0.75 to 1.25 (fluctuation width is in a range of ±25%) times that of the main lever 14. Pitch a to d between the connecting axis of the four link system according to each lever is set such that the wiper arm 12 rotates at a predetermined angle within the rotation angle range of the main lever 14. Therefore, not only is the wiper range expanded, but the action of the wiper arm 12 is smooth and the fluctuation width of the rotation angle speed will not become too great.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle wiper device for wiping windshield glass or the like of an automobile.

[0002]

2. Description of the Related Art A wiper device for a vehicle for wiping windshield glass or the like of an automobile includes a wiper arm and a wiper blade held by the wiper arm.

In the wiper arm, one end of an arm head is fixed to a pivot shaft, and a retainer is connected to the other end of the arm head via a support shaft so as to be rotatable by a predetermined angle. A spring is stretched between the arm head and the retainer, and constantly urges the retainer toward a wiping surface such as a windshield glass. An arm piece is fixed to the tip of the retainer. The distal end of the arm piece is bent into a substantially U-shape to form a holding portion, and connects and holds the wiper blade. On the other hand, the wiper blade includes a blade rubber that contacts and wipes the wiping surface, and a plurality of holding levers that hold the blade rubber.

When the wiper device for a vehicle is operated, the wiper arm and the wiper blade reciprocate, so that the blade rubber moves in close contact with the windshield glass surface and wipes raindrops.

By the way, in such a wiper device for a vehicle, a wide-area wiping provided with a telescopic wiper arm is provided so that an unwiped area is not generated as much as possible over the entire surface of the windshield glass (so that the wiping range is enlarged). A wiper device having a wiper arm called a four-link type wiper arm has been known among the wide-range wiping-type wiper devices (for example, Japanese Patent Application Laid-Open No. SHO 61-61). 181745).

A vehicle wiper device having a wiper arm of this type, which is a four-link type, includes a pair of a main lever and a sub lever. The main lever is connected and fixed to a pivot shaft, and the sub-lever is rotatably supported by a support shaft provided at a position separated from the pivot shaft by a predetermined distance. Further, the main lever and the sub-lever are arranged side by side with each other, and have a configuration in which an arm head is rotatably connected to a distal end portion thereof via a connection shaft.

When the main lever is rotated together with the pivot shaft, the arm head is rotated while being relatively moved toward and away from the pivot shaft by a sub-lever which follows the rotation operation of the main lever and regulates the operation of the arm head. The total length of the wiper arm expands and contracts. Thereby, at the predetermined wiping position, the entire length of the wiper arm is apparently elongated, and the wiping range is expanded. Therefore, for example, when wiping a windshield glass surface having a relatively long vertical dimension, a wiper device having a general wiper arm (the arm head is directly fixed to the pivot shaft, and the wiper arm and the wiper blade are simply In comparison with the case where the reciprocating arc rotates around the pivot axis), the area of the windshield glass that is left unwiped is less likely to occur in the entire area.

In a vehicle wiper device having a wiper arm of this type, which is a four-bar link type, the wiper arm apparently extends at a predetermined wiping position to extend the wiping range. Since the wiping operation is based on a combined movement of the rotating motion and the stretching motion, the rotating speed (angular speed) of the wiper arm (wiper blade) is
In some cases, the driver changes irregularly (becomes faster or slower) from the upper inversion position to the lower inversion position, and the driver may feel uncomfortable.

This is because the rate of change (variation width) of the rotational angular velocity of the wiper arm (wiper blade) between the upper reversing position and the lower reversing position becomes too large. When the fluctuation range of the rotation angular velocity exceeds ± 25% as compared with the provided wiper device (the arm head is directly fixed to the pivot shaft, and the wiper arm and the wiper blade simply rotate reciprocatingly around the pivot shaft). Most drivers feel uncomfortable.

Further, for example, if the fluctuation range of the rotational angular velocity is large, the input load to the wiper device is instantaneously increased, so that another new measure for securing the strength of each part is required, If the rotational angular velocity is large near the position,
The inertia force may cause the wiper arm (wiper blade) to remarkably overrun, so that another new measure is required to prevent this.

[0011]

In view of the above facts, the present invention not only increases the wiping range but also increases the wiping range by using a four-bar linkage with a main lever and a sub-lever and an arm head to which they are connected. It is an object of the present invention to obtain a vehicle wiper device in which the operation of the vehicle is smooth and the occupant does not feel uncomfortable.

[0012]

According to a first aspect of the present invention, there is provided a wiper device for a vehicle, comprising: a main lever connected to a rotating shaft provided on a vehicle body and rotating together with the rotating shaft; A sub-lever rotatably supported by a support shaft provided on the vehicle body at a predetermined distance, a tip end of the main lever rotatably connected via a first connection shaft, and a tip of the sub-lever A four-bar link formed with an arm head having a portion rotatably connected via a second connection shaft; a wiper blade connected to the arm head and a tip connected to the arm head; A wiper arm that rotates a predetermined angle in conjunction with the rotation of the lever, wherein the rotational angular velocity of the wiper arm is 0.7 to the rotational angular velocity of the main lever.
Setting the rotation angle range of the main lever within a range of 5 times to 1.25 times; and setting the rotation shaft and the first shaft so that the wiper arm rotates the predetermined angle within the rotation angle range of the main lever. A pitch between the connecting shaft, a pitch between the first connecting shaft and the second connecting shaft, a pitch between the supporting shaft and the second connecting shaft, and the rotating shaft and the supporting shaft , And a relative ratio of each of the pitches is set.

In the wiper device for a vehicle according to the first aspect, the main lever is connected and fixed to the rotation shaft, and the sub lever is rotatable about a support shaft provided at a predetermined distance from the rotation shaft. It is supported by. Further, the main lever and the sub-lever are arranged in parallel with each other, an arm head is rotatably connected to a tip of the main lever via a first connection shaft, and a tip of the sub-lever is connected to the tip of the sub-lever. The arm head is rotatably connected via two connection shafts, and a four-bar linkage is formed as a whole.

When the main lever rotates together with the rotation shaft,
By the sub-lever that regulates the operation of the arm head following the rotation operation of the main lever, the arm head rotates while relatively moving away from the rotation axis, and as a result, the entire length of the wiper arm expands and contracts. Thereby, at the predetermined wiping position, the entire length of the wiper arm is apparently elongated, and the wiping range is expanded. Therefore, compared with a general wiper device having a wiper arm (an arm head is directly fixed to a pivot shaft, and the wiper arm and the wiper blade simply rotate reciprocatingly around the pivot shaft), the entire area of the windshield glass surface is increased. In this case, it is difficult to form an unwiped area.

Here, in the vehicle wiper device according to the first aspect, the positional relationship between the levers and the shafts constituting the four-bar linkage is set to a predetermined value. That is, in this wiper device, the rotation angle (wiping range) of the wiper arm is set to a predetermined angle while establishing the four-bar linkage.
Then, the rotation angle range of the main lever is set such that the rotation angular speed of the wiper arm is in the range of 0.75 to 1.25 times the rotation angular speed of the main lever (the fluctuation range is within ± 25%). The pitch between the rotation axis and the first connection axis and the pitch between the first connection axis and the second connection axis are set so that the wiper arm rotates by the predetermined angle within the set rotation angle range of the main lever. Pitch between the support shaft and the second connection shaft, and pitch between the rotation shaft and the support shaft,
Are set.

[0016] Thus, between the upper reversing position and the lower reversing position of the wiper arm (wiper blade) for wiping a wide area by a four-link type, that is, a combined movement in which the wiper arm is apparently expanded and contracted while being rotated.
Since the fluctuation width of the rotational angular velocity does not become too large, the driver hardly feels a sense of discomfort due to the wiping operation of the wiper arm, similarly to a wiper device having a general wiper arm.

As described above, the wiper device for a vehicle according to the first aspect of the present invention has a four-link structure with the main lever, the sub lever, and the arm head to which the main lever and the sub lever are connected. The operation of the wiper arm is smooth, and the occupant hardly feels uncomfortable. Further, since the fluctuation width of the rotational angular velocity is small, the input load to the wiper device does not increase instantaneously, and another new measure for securing the strength of each component is not required.
Further, since the rotational angular velocity does not increase near the reversing position, there is no possibility that the wiper arm (wiper blade) will significantly overrun.

Further, in order to wipe a certain area of the wiping surface, for example, to wipe a windshield glass of a certain shape, the rotation angle (wiping range) of the wiper arm is set to 94.
When set to 8 °, the rotational angular velocity of the wiper arm is 0.75 times the rotational angular velocity of the main lever.
The main lever rotation angle range of 1.25 times
The relative ratio suitable for the wiper arm to rotate 94.8 ° as described above in the range of the rotation angle of the main lever set to 5 ° to 178 ° is, for example, a relative ratio of each pitch, 1: 1.06: 2.12: 2.
It is preferably 56.

According to a second aspect of the present invention, there is provided a vehicle wiper device, wherein the main lever is connected to a rotating shaft provided on a vehicle body and rotates with the rotating shaft. A sub-lever rotatably supported by a support shaft provided on a vehicle body, a tip end of the main lever rotatably connected via a first connection shaft, and a tip end of the sub-lever connected to a second connection An arm head rotatably connected via a shaft, a four-bar link is formed, and the wiper device for a vehicle includes a wiper arm connected to the arm head and connected to a tip of a wiper blade. A pitch between the rotation axis and the first connection axis,
A pitch between the first connection shaft and the second connection shaft, a pitch between the support shaft and the second connection shaft, and a pitch between the rotation shaft and the support shaft. Is set such that the rotational angular velocity of the wiper arm is in the range of 0.75 to 1.25 times in the entire wiping range of the wiper arm with respect to the rotational angular velocity of the main lever. I have.

In the vehicle wiper device according to the second aspect, the main lever is connected and fixed to the rotation shaft, and the sub lever is rotatable about a support shaft provided at a predetermined distance from the rotation shaft. It is supported by. Further, the main lever and the sub-lever are arranged in parallel with each other, an arm head is rotatably connected to a tip of the main lever via a first connection shaft, and a tip of the sub-lever is connected to the tip of the sub-lever. The arm head is rotatably connected via two connection shafts, and a four-bar linkage is formed as a whole.

When the main lever rotates together with the rotation shaft,
By the sub-lever that regulates the operation of the arm head following the rotation operation of the main lever, the arm head rotates while relatively moving away from the rotation axis, and as a result, the entire length of the wiper arm expands and contracts. Thereby, at the predetermined wiping position, the entire length of the wiper arm is apparently elongated, and the wiping range is expanded. Therefore, compared with a general wiper device having a wiper arm (an arm head is directly fixed to a pivot shaft, and the wiper arm and the wiper blade simply rotate reciprocatingly around the pivot shaft), the entire area of the windshield glass surface is increased. In this case, it is difficult to form an unwiped area.

Here, in the vehicle wiper device according to the second aspect, the positional relationship between the levers and shafts constituting the four-bar linkage is set to a predetermined value. That is, the rotation axis and the first connection axis are set so that the rotation angular velocity of the wiper arm is in the range of 0.75 to 1.25 times the rotation angular velocity of the main lever (the fluctuation range is within ± 25%). Pitch between the first connection axis and the second connection axis,
A relative ratio between a pitch between the support shaft and the second connection shaft and a pitch between the rotation shaft and the support shaft is set.

With this arrangement, a four-bar link type, that is, a wiper arm (wiper blade) for wiping a wide area by a combined movement of apparently expanding and contracting while rotating the wiper arm, from the upper inversion position to the lower inversion position,
Since the fluctuation width of the rotational angular velocity does not become too large, the driver hardly feels a sense of discomfort due to the wiping operation of the wiper arm, similarly to a wiper device having a general wiper arm.

As described above, the wiper device for a vehicle according to the second aspect of the present invention has a four-bar linkage system with the main lever, the sub lever, and the arm head to which the main lever and the sub lever are connected, so that the wiping range can be expanded. The operation of the wiper arm is smooth, and the occupant hardly feels uncomfortable. Further, since the fluctuation width of the rotational angular velocity is small, the input load to the wiper device does not increase instantaneously, and another new measure for securing the strength of each component is not required.
Further, since the rotational angular velocity does not increase near the reversing position, there is no possibility that the wiper arm (wiper blade) will significantly overrun.

Further, when wiping an area having a wiping surface, the relative ratio is preferably set so that the rotational angular velocity of the wiper arm is in the range of 0.75 to 1.25 times the rotational angular velocity of the main lever as described above. For example, the relative ratio of each pitch is 1: 1.06: 2.12:
It is preferably 2.56.

[0026]

FIG. 2 is a plan view showing the overall configuration of a vehicle wiper device 10 according to an embodiment of the present invention. FIG. 3 is a front view of the wiper device 10 applied to a vehicle.

The wiper device 10 includes a wiper arm 12
And the wiper blade 3 held by the wiper arm 12
6.

The wiper arm 12 has a main lever 14 and a sub lever 16. The main lever 14
One end thereof is fixed to a pivot shaft 18 provided as a rotating shaft provided on the vehicle body, and always rotates together with the pivot shaft 18. The sub-lever 16 is rotatably supported by a support shaft 20 provided at a position separated from the pivot shaft 18 by a predetermined distance, and the vehicle body or frame between the pivot shaft 18 and the support shaft 20 connects the immovable link F. Has formed. Furthermore, the main lever 14 and the sub-lever 16
Are arranged in parallel with each other, and an arm head 24 is rotatably connected to a distal end portion of the main lever 14 by a connecting shaft 22 as a first connecting shaft.
Further, an arm head 24 is rotatably connected to a tip end of the sub-lever 16 by a connection shaft 26 as a second connection shaft.

A retainer 28 constituting the wiper arm 12 is connected to the other end of the arm head 24 via a support shaft 30 so as to be rotatable at a predetermined angle in a direction approaching and separating from the windshield glass G. Further, the retainer 28
A spring (not shown) is stretched between the arm head 24 and the arm head 24, and always urges the retainer 28 toward the wiping surface of the windshield glass G. Further, an arm piece 32 that constitutes the wiper arm 12 together with the retainer 28 is fixed to a distal end portion of the retainer 28. The distal end of the arm piece 32 is bent into a substantially U-shape to form a holding portion 34, and the wiper blade 36 is connected and held via a clip member (not shown).

As described above, the wiper device 10 is provided with the wiper arm 12 of a four-link type. When the main lever 14 rotates together with the pivot shaft 18, the arm is driven by the rotation of the main lever 14. The arm lever 24 is controlled by the sub-lever 16 that regulates the operation of the head 24.
Rotate relative to the pivot shaft 18 while relatively moving away from it, and as a result, the entire length of the wiper arm 12 expands and contracts (the supporting position of the arm head 24 is displaced and the overall length apparently expands and contracts).

A link cover 40 is attached to the arm head 24. The link cover 40 is made of resin and formed in a substantially sector shape as a whole, and is attached to the arm head 24 so as to cover the arm head 24 from above.
The link cover 40 is arranged so as to extend right above the main lever 14 and the sub-lever 16 (a position outside the vehicle with respect to the main lever 14 and the sub-lever 16). The link mechanism portion including the sub-lever 16 and the like (at least a region surrounded by each lever and the arm head 24) is covered.

In this case, the size and shape of the link cover 40 are such that the link cover 40 covers at least an uncovered area of the movement range of the main lever 14 and the sub-lever 16 which is not covered by the vehicle engine hood F (see FIG. 3). Is set. Therefore, when the link cover 40 is attached to the arm head 24, the link mechanism portion including the main lever 14 and the sub-lever 16 (at least a region surrounded by each lever and the arm head 24) is not exposed to the outside. It is configured.

Here, in this wiper device 10,
The positional relationship between the levers and the shafts constituting the four-bar linkage is set to a predetermined value. That is, in the wiper device 10, the rotation angle (wiping range) of the wiper arm 12 is set to a predetermined angle while establishing the four-bar linkage. For example, in the present embodiment, the rotation angle (wiping angle) of the wiper arm 12 is set to 94.8 ° according to the shape of the windshield glass of the vehicle. Furthermore, the wiper arm 1 has a rotational angular velocity of the main lever 14 which is equivalent to the rotational angular velocity of a general wiper arm (an arm head is directly fixed to a pivot shaft, and the wiper arm simply reciprocates around the pivot axis).
The rotation angle range of the main lever 14 is set so that the rotation angle speed of the main lever 2 becomes 0.75 to 1.25 times, and the rotation angle range of the wiper arm 12 is set within the rotation angle range of the main lever 14 (range A in FIG. 4). The positional relationship between the levers and the shafts constituting the four-bar linkage is set to a predetermined value so as to obtain a moving angle of 94.8 °.

That is, as shown in FIG.
8, a pitch b between the connecting shaft 22 and the connecting shaft 26, a pitch c between the supporting shaft 20 and the connecting shaft 26, and a pitch a between the supporting shaft 20 and the connecting shaft 26. The relative ratio of the pitch d to the rotation angle speed of the wiper arm 12 is in the range of 0.75 to 1.25 times the rotation angle speed of the main lever 14.
Of the rotation angle range (range A in FIG. 4)
°, the predetermined wiper arm rotation angle 94.
The pitch of each lever to obtain 8 °, for example, a: b:
c: d = 1: 1.06: 2.12: 2.56.

Next, the operation of the present embodiment will be described.

In the vehicle wiper device 10 having the above-described structure, the wiper arm 12 and the wiper blade 36 are reciprocated by the rotation of the pivot shaft 18, thereby wiping raindrops and the like on the windshield glass surface.

In this case, when the main lever 14 rotates together with the pivot shaft 18, the arm head 24 is moved relative to the pivot shaft 18 by the sub-lever 16 that follows the rotation of the main lever 14 and regulates the operation of the arm head 24. The wiper arm 1
The entire length of 2 expands and contracts (the supporting position of the arm head 24 is displaced and the overall length apparently expands and contracts). Thus, at the predetermined wiping position, the entire length of the wiper arm 12 is apparently elongated, and the wiping range is expanded. Therefore, compared to a wiper device having a general wiper arm, an unwiped area is less likely to occur in the entire area of the windshield glass surface.

Further, in the wiper device 10, since the link cover 40 is provided integrally with the arm head 24, the movement range of the link mechanism portion constituted by the main lever 14, the sub-lever 16 and the arm head 24 is covered with snow. Even if ice or ice adheres or tries to stay, this is prevented by the link cover 40. Therefore, it is possible to prevent the smooth operation of the link mechanism, that is, the wiper device 10 from being hindered. In particular, it is possible to prevent foreign matter such as twigs from accidentally entering the moving range of the link mechanism.

Further, in the wiper device 10 according to the present embodiment, the positional relationship between the levers and the shafts constituting the four-bar linkage is set to a predetermined value. That is, in the wiper device 10, the rotation angle (wiping range) of the wiper arm 12 is set to a predetermined angle while establishing the four-bar linkage. The rotational angular velocity of the wiper arm 12 is 0.75 times the rotational angular velocity of the main lever 14.
X to 1.25 x range (variation range within ± 25%)
The rotation angle range of the main lever 14 is set as follows. The pitch a between the pivot shaft 18 and the connecting shaft 22 and the pitch between the connecting shaft 22 and the connecting shaft 26 so that the wiper arm 12 rotates by the predetermined angle within the set rotation angle range of the main lever 14. b, a pitch c between the support shaft 20 and the connection shaft 26, and a pitch d between the pivot shaft 18 and the support shaft 20 are set to respective relative ratios.

For example, in FIG. 4, the rotation angle (wiping range) of the wiper arm 12 is set to 94.8 °, and the respective ratios of the pitches a to d are set to 1: 1.06:
A characteristic diagram of the rotational angular velocity of the wiper arm 12 when the configuration is set as 2.12: 2.56 is shown.
In FIG. 4, the horizontal axis is the rotation angle α of the main lever 14 (the angle formed by the line connecting the pivot shaft 18 and the support shaft 20 and the line connecting the pivot shaft 18 and the connection shaft 22).
The vertical axis represents the rotational angular velocity ratio of the wiper arm 12 to the rotational angular velocity of the main lever 14.

In FIG. 4, the rotation angle α is between 0 ° and X °.
And the range of Z ° to 360 ° are areas where the link mechanism is not established. Also, when the rotation angle α is Y °
In the range of Z °, the rotational angular velocity of the wiper arm 12 is “-”, which indicates that the wiper arm 12 is normally moving backward with respect to the traveling direction of the wiper arm. Therefore, the device cannot be used in this area. Therefore, what is realized as the device is a region where the rotation angle α is X ° to Y °.

Here, the rotational angular velocity of the wiper arm 12 set at a predetermined rotational angle as described above is the main lever 1.
The main lever 1 has a range of 0.75 times to 1.25 times the rotation angular velocity of 4 (a range of fluctuation is within ± 25%).
4 is set. For example, wiper arm 1
2 is set to 94.8 ° as described above, the rotational angular velocity of the wiper arm 12 is 0.75 to 1.15 times the rotational angular velocity of the main lever 14.
It is preferable to set the rotation angle of the main lever 14 to 75 ° to 178 ° within the range of 25 times. Within this set rotation angle range of the main lever 14, the wiper arm 1
2 is rotated by the predetermined angle (94.8 °), the ratio of each of the pitches a to d is set to 1: 1.0.
6: 2.12: 2.56. With this setting, the rotational angular velocity of the wiper arm 12 is 0.75 to 1.2 times the rotational angular velocity of the main lever 14 over the entire range of the rotational angle of the wiper arm 12.
5 times (fluctuation range within ± 25%).

Here, as described above, the rotational angular velocity of the wiper arm 12 is set to 0.
In order to make the range of 75 times to 1.25 times, the pitch a
To the boundary value (limit value) of the relative ratio of each pitch d
Will be considered.

The relative ratio at which the rotational angular speed of the wiper arm 12 with respect to the rotational angular speed of the main lever 14 can be made substantially the same up to the limit (this ratio is referred to as an upper limit) is, for example, 1% for each of the pitches a to d. :
If the rotation angle α is set to 1.05: 2.2: 2.99, the rotation angle speed of the wiper arm 12 with respect to the rotation angle speed of the main lever 14 in the region where the rotation angle α is approximately 100 ° to 160 °, as shown in FIG. They can be set almost the same.

The combination of the relative ratios that can make the rotational angular velocity of the wiper arm 12 substantially the same as the rotational angular velocity of the main lever 14 to the limit as shown in FIG. 6 is shown as data in FIG. FIG. 7 shows these data as a three-dimensional graph.

On the other hand, the relative ratio (this ratio is referred to as a lower limit) when the fluctuation range of the rotational angular speed of the wiper arm 12 with respect to the rotational angular speed of the main lever 14 reaches the limit is, for example, the pitch a to the pitch d. If each ratio is set as 1: 1: 2.2: 2.53,
As shown in FIG. 8, when the rotation angle α is around 150 °, the fluctuation range of the rotation angular velocity of the wiper arm 12 is the maximum limit (A
Point), which is the lower limit (the limit on the + side). Further, for example, the respective ratios of the pitches a to d are set to 1: 1.05: 2.2: 2.56.
If the rotation angle α is set to 80 ° as shown in FIG.
In the vicinity, the fluctuation width of the rotational angular velocity of the wiper arm 12 is −25.
% (Point B), and the lower limit (-
Side limit value).

FIG. 10 shows the combination of the relative ratios when the fluctuation range of the rotational angular velocity of the wiper arm 12 with respect to the rotational angular velocity of the main lever 14 reaches the limit as shown in FIG. 10
FIG. 11 shows a three-dimensional graph of these data shown in FIG.

Therefore, if the combination of the above-mentioned relative ratios exists between the upper limit shown in FIGS. 6 and 7 and the lower limit shown in FIGS. 10 and 11, the rotational angular velocity of the wiper arm 12 with respect to the rotational angular velocity of the main lever 14 will be described. To 0.7
The range can be 5 to 1.25 times (the range of variation is within ± 25%). That is, FIG. 12 is a graph in which the upper limit shown in FIG. 7 and the lower limit shown in FIG. 11 are combined and represented in one graph, and the combination of the relative ratio existing between the upper limit and the lower limit is shown in FIG. By choosing
Wiper arm 1 for angular velocity of main lever 14
2 can be set to a range of 0.75 times to 1.25 times (a range of fluctuation is within ± 25%).

As a result, the fluctuation width of the rotational angular velocity between the upper reversal position and the lower reversal position of the four-link type wiper arm 12 (wiper blade 36) does not become too large. The driver hardly feels discomfort like the wiper device provided with.

As described above, the wiper device 10 for a vehicle according to the present embodiment is a four-bar linkage type, that is, the wiper arm 12 is rotated by the main lever 14 and the sub-lever 16 and the arm head 24 to which they are connected. In addition to expanding the wiping range by the combined movement of the upper and lower movements, the occupant almost feels uncomfortable because the operation of the wiper arm 12 is smooth and the fluctuation width of the rotational angular velocity is as small as a general wiper arm. There is no. Further, since the fluctuation width of the rotational angular velocity of the wiper arm 12 is small as in the case of a general wiper arm, the input load to the wiper device 10 does not increase instantaneously, and another new method for securing the strength of each component is not required. No countermeasures are required. Further, since the rotational angular velocity does not increase near the reversing position, the wiper arm 12 (wiper blade 3
6) does not have a significant overrun.

[Brief description of the drawings]

FIG. 1 is a plan view showing an arrangement relationship of each lever and a shaft constituting a four-bar linkage of a wiper device according to an embodiment of the present invention.

FIG. 2 is a plan view showing the overall configuration of the wiper device according to the embodiment of the present invention.

FIG. 3 is a front view showing a state in which the wiper device according to the embodiment of the present invention is applied to a vehicle.

FIG. 4 is a characteristic diagram of a rotational angular velocity of a wiper arm when a relative ratio of a pitch between a lever and a shaft is set to a predetermined value in a wiper device according to an embodiment of the present invention.

FIG. 5 is a characteristic diagram of the rotational angular velocity of the wiper arm when the relative ratio of the pitch between the lever and the shaft is set to one of the upper limits in the wiper device according to the embodiment of the present invention.

FIG. 6 is a correspondence diagram of relative ratios showing combinations of upper limit values of the relative ratio of the pitch between the lever and the shaft in the wiper device according to the embodiment of the present invention.

FIG. 7 is a correspondence diagram of upper limit relative ratios in which the data shown in FIG. 6 is represented as a three-dimensional graph.

FIG. 8 is a characteristic diagram of the rotational angular velocity of the wiper arm when the relative ratio of the pitch between the lever and the shaft is set to one of the lower limits in the wiper device according to the embodiment of the present invention.

FIG. 9 is a characteristic diagram of the rotational angular velocity of the wiper arm when the relative ratio of the pitch between the lever and the shaft is set to one of the lower limits in the wiper device according to the embodiment of the present invention.

FIG. 10 is a correspondence diagram of relative ratios showing a combination of lower limit values of the relative ratio of the pitch between the lever and the shaft in the wiper device according to the embodiment of the present invention.

11 is a correspondence diagram of a lower limit relative ratio in which the data shown in FIG. 10 is represented as a three-dimensional graph.

12 is a correspondence diagram in which the upper limit relative ratio shown in FIG. 7 and the lower limit relative ratio shown in FIG. 11 are combined and represented in one graph.

[Explanation of symbols]

 Reference Signs List 10 Wiper device 12 Wiper arm 14 Main lever 16 Sub lever 18 Pivot shaft (rotating shaft) 20 Support shaft 22 Connecting shaft (first connecting shaft) 24 Arm head 26 Connecting shaft (second connecting shaft) 36 Wiper blade

Claims (2)

[Claims] A main lever connected to a rotating shaft provided on the vehicle body and rotating together with the rotating shaft; and a main lever rotatable on a supporting shaft provided on the vehicle body at a predetermined distance from the rotating shaft. And an arm to which the tip of the main lever is rotatably connected via a first connection shaft and the tip of the sub lever is rotatably connected via a second connection shaft. A four-bar link formed having a head, and a wiper arm connected to the arm head and having a tip connected to a wiper blade, and rotating at a predetermined angle in conjunction with the rotation of the main lever. The wiper device for a vehicle, comprising: setting a rotation angle range of the main lever in which a rotation angular speed of the wiper arm is in a range of 0.75 to 1.25 times a rotation angular speed of the main lever; The pitch between the rotation axis and the first connection axis and the pitch between the first connection axis and the second connection axis are set so that the wiper arm rotates the predetermined angle within the rotation angle range of the main lever. A pitch between the support shaft and the second connection shaft, and a pitch between the rotation shaft and the support shaft, respectively. Wiper device. 2. A main lever which is connected to a rotating shaft provided on the vehicle body and rotates together with the rotating shaft, and is rotatable on a supporting shaft provided on the vehicle body at a predetermined distance from the rotating shaft. And an arm to which the tip of the main lever is rotatably connected via a first connection shaft and the tip of the sub lever is rotatably connected via a second connection shaft. A wiper arm having a wiper arm connected to the arm head and having a wiper blade connected to a tip thereof, wherein the rotation shaft and the first connection shaft are provided. , The pitch between the first connecting shaft and the second connecting shaft, the pitch between the supporting shaft and the second connecting shaft.
The pitch between the connection shaft and the pitch between the rotation shaft and the support shaft, and the relative ratio between the rotation angular speed of the main lever and the rotational angular speed of the wiper arm are defined by the relative angular speed of the wiper arm. A wiper device for a vehicle, wherein the wiper device is set so as to be within a range of 0.75 to 1.25 times in all regions.