JP3108041B2 - Wiper arm and vehicle wiper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[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 mounted between the arm head and the retainer, and constantly biases 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.

[0004] On the other hand, the wiper blade is constituted by a blade rubber that comes into contact with the wiping surface to wipe the blade, 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 while being in close contact with the windshield glass surface and wipes raindrops.

By the way, in this type of vehicle wiper device, a retainer 72 is generally formed in a U-shaped cross section as shown in FIG. 10, and the opening side thereof is arranged facing the windshield glass surface 62. . For this reason, when the retainer 72 is placed in the airflow S as the vehicle travels at a high speed (when the airflow S hits the retainer 72), a loud wind noise may be generated. That is, when the high-speed airflow S hits the retainer 72, the turbulence of the airflow S behind the front side wall 74 located on the upstream side of the relative airflow among the side walls of the retainer 72 formed in a U-shaped cross section (so-called Kalman). A vortex, called a vortex street, is generated, and the vortex hits a rear side wall 76 located downstream of the relative airflow S, and induces high-frequency vibration called a cavity tone (edge tone). Further, the cavity tone resonated with the internal space of the retainer 72 having a U-shaped cross section, generating a large wind noise (high-frequency resonance vibration). For this reason, a countermeasure capable of preventing such a wind noise has been desired.

As a countermeasure for reducing such wind noise during high-speed running, there has been proposed an automobile wiper in which a notch is formed in a retainer (Japanese Utility Model Application Laid-Open No. 59-66652).
No.).

In the automobile wiper disclosed in the above publication,
At the lower edge of the rear wall of the retainer formed in a U-shaped cross section,
It has a configuration in which a notch is formed. As a result, even if the high-speed airflow hits the retainer and a vortex is generated behind the front side wall located on the upstream side, it is difficult for the vortex to hit the rear side wall (located on the downstream side of the relative airflow). In this configuration, it is difficult to induce high-frequency vibration called a tone (edge tone).

However, in the vehicle wiper disclosed in the above publication, the vortex generated behind the front side wall only hardly hits the rear side wall located on the downstream side. Can be reduced to some extent on the rear side wall, but this cannot be sufficiently prevented. That is, it is only difficult to induce a cavity tone (high-frequency vibration) generated when the eddy current strikes the rear side wall, and there is still room for improvement in preventing (surely) this. Further, in the automobile wiper disclosed in the above publication, turbulence of air flow (vortex flow called Karman vortex street) still occurs behind the side wall on the front side, and the turbulence still exists in the internal space of the retainer having a U-shaped cross section. I do. Therefore, the wind noise caused by the vortex itself cannot be reduced.

Further, in general, a retainer of a wiper arm having a U-shaped cross section desirably makes the tip end side as thin as possible because the wiping operation obstructs the driver's field of view. Both the height and the width of the base end (the side of the arm head) and the width of the base end (the side of the arm head) are formed larger than the distal end side (the side of the arm piece) because they must be fixed and must have sufficient strength and rigidity. In addition, since the height and the width, particularly the width, gradually increase from the distal end to the proximal end, a notch is simply provided at the lower end edge of the rear wall of the retainer as described in the above publication. However, at the base end portion having a large width dimension, the above-described airflow also hits the rear wall, so that the effect of preventing the cavity tone (high-frequency vibration) cannot be exerted.

[0011]

SUMMARY OF THE INVENTION In view of the above facts, the present invention takes the above-mentioned facts into consideration, and as a result of the flash surface of the vehicle (the flushing of the vehicle body), the airflow flowing on the surface of the vehicle body flows without hindrance. It is an object of the present invention to significantly reduce wind noise generated by a wiper arm and a vehicle wiper device, which is one of the factors that hinder the vehicle.

[0012]

According to a first aspect of the present invention, there is provided a wiper arm comprising an arm head fixed to a rotating shaft provided on a vehicle, a pair of side walls facing each other, and upper end portions of the side walls. A retainer portion formed in a U-shaped cross section with one side opened by a continuous upper wall, and a width of the upper wall is gradually increased from a distal end toward the arm head. The arm is pivotally supported by the arm head in a state where the opening of the portion faces the wiping surface side, and an arm body to which a wiper blade is connected at the tip, and the arm head and the arm body are stretched. a wiper arm comprising a resilient means for pressing the wiping surface direction arm member, and the arm body, the retail
The vehicle in the vehicle mounted state among the pair of side walls of the
Leading edge in the other side wall height from the top wall of the leading edge portion of one sidewall of which is located on the downstream side of the relative air current flowing toward the front side to the windshield glass, located upstream of the relative air flow a step portion which is lower than the height from the top wall parts is provided, and the step portion
The difference between the heights of the side walls at the side was gradually increased continuously from the wiper blade side to the arm head side,
It is characterized by:

[0013] In the wiper arm according to the first aspect, the arm body is constituted by a pair of side walls facing each other and an upper wall continuous between upper end portions of the side walls, one side of which is opened and the width of the upper wall is set at the tip. There is provided a retainer portion that is formed gradually larger from the side toward the arm head (that is, formed to be tapered). Further, the arm body, over a predetermined range in the longitudinal direction, the height of the pair of side walls of the retainer portion from the upper wall of the distal end edge portion on the rear side wall located downstream of the relative airflow, The height of the front edge of the front side wall located on the upstream side of the relative airflow is lower than the height of the front edge from the upper wall, and the difference in height between the two side walls is closer to the arm head side than the wiper blade side. It is gradually increased continuously.

[0014] In other words, in other words, the arm body has a stepped edge having a predetermined dimension such that the front edge of the rear side wall is closer to the upper wall than the front edge of the front side wall over a predetermined range in the longitudinal direction. The step is gradually increased toward the base end side (arm head side).

Therefore, even if a high-speed airflow hits the arm body (retainer portion) and a vortex is generated behind the front side wall located on the upstream side, the vortex is generated on the rear side (located downstream of the relative airflow). It is difficult to hit the side wall, and it is difficult to induce high frequency vibration called cavity tone (edge tone).

Here, in order to secure the strength and rigidity of the retainer portion having a U-shaped cross section and the driver's view, the width of the upper wall on the base end side (arm head side) is larger than that on the distal end side (ie, Although the width of the upper wall on the distal side is small) and the entire wall is tapered, the step between the rear side wall and the front side wall is gradually increased at the base end side of the retainer portion as described above. Therefore, the effect of preventing the generation of the vortex (the effect of preventing the cavity tone) does not decrease.

Thus, in the wiper arm according to the first aspect, the wind noise when the vehicle is traveling can be significantly reduced.

A wiper arm according to a second aspect of the present invention is a vehicle
Arm heads fixed to the rotating shafts provided on both sides;
Between the pair of side walls facing each other and the upper ends of the side walls.
And one side is opened by the upper wall
The width of the upper wall is from the tip side to the arm head side
It has a retainer part that is gradually enlarged
The arm head with the opening of the corner portion facing the wiping surface.
And a wiper blade at the tip.
Arm, to which the arm head and the arm are connected
And presses the arm body in the direction of the wiping surface.
And a resilient means.
The tip of the pair of side walls of the retainer portion
To form an inverted triangular cross section that is close to each other, and
In the inverted triangular section, the leading edge portions are mutually
Of the pair of approached side walls, the vehicle
Phase flowing from both front sides to windshield glass
The tip edge on one side wall located downstream of the airflow
The height of the joint from the upper wall to the upstream side of the relative airflow.
Is the upper wall of the tip edge on the other side wall located
A step portion lower than the height of the
The difference between the heights of both side walls in the
From the side to the side of the arm head.
It is characterized by:

According to the wiper arm of the present invention, a pair of side walls of the retainer portion extending over a predetermined range in the longitudinal direction are formed so that their leading edge portions are close to each other, and the entire portion has an inverted triangular cross section. Is formed. I
In the inverted triangular section, the tip edges touch each other.
Of the pair of approached side walls, the vehicle
Relative flow from front to windshield glass
Tip edge on one side wall located downstream of airflow
The height from the upper wall of the section is located upstream of the relative airflow.
From the top wall of the tip edge on the other side wall
Step is provided, and this step
Difference between the heights of both side walls at the side of the wiper blade
From the arm head to the arm head.
Since the distance of the opening between the leading edge portion side walls close to each other of the side walls is smaller, also suppressed airflow from entering the opening.

Therefore, even if the high-speed airflow hits the arm body (retainer portion), the high-speed airflow is located on the upstream side.
It does not hit the other side wall vertically, flows smoothly without turbulence from the other side wall located on the upstream side along one side wall located on the downstream side, and the other side located on the upstream side In the first place, a vortex is unlikely to occur behind the side wall. As described above, since the vortex is unlikely to be generated, the vortex flows downstream as in the related art.
No high-frequency vibration called a cavity tone (edge tone) occurs on the side wall located at the position (1). In addition, a vortex is unlikely to be generated behind the other side wall located on the upstream side, and in particular, it is possible to greatly suppress the inflow of airflow into the inside of both side walls. Does not occur.

As described above, according to the wiper arm of the second aspect, the wind noise when the vehicle travels at a high speed can be significantly reduced.

According to a third aspect of the present invention, in the wiper arm according to the second aspect, the inverted triangular cross section is provided.
A pair of side walls of Jo portion, the angle at which one side wall located on the downstream side of the relative air flow forms with the upper wall, the angle of the other side wall located upstream of the relative air flow forms with the upper wall <br/>

In the wiper arm according to the third aspect, the cross section is reversed.
Angle of the pair of side walls of the triangular portions, the angle formed between one side wall and the upper wall positioned downstream of the relative air flow to the other side wall and top wall located upstream of the relative air flow forms <br/>.

In other words, in other words, the arm body has a pair of side walls of the retainer portion over a predetermined range in the longitudinal direction.
The leading edge portions thereof are formed close to each other to form an inverted triangular cross section as a whole, and are located downstream of the relative airflow.
Side wall of the rear side located is positioned close to the side of the top wall than the side walls of the front side, located in a stepped state of a predetermined size to the side wall of the front side.

Therefore, in addition to having the same function and effect as the wiper arm according to the second aspect, even if the height of the both side walls is the same , the angle formed with the upper wall is changed so that the side wall located on the upstream side can be formed. On the other hand, since the side wall located on the downstream side can be in a stepped state, the material and the mold of the wiper arm which does not need the stepped state (the height of both side walls is the same) can be used in common.

According to a fourth aspect of the present invention, in the wiper arm according to the first, second, or third aspect, the arm body is fixed to a tip of the retainer portion and the wiper blade is connected. It has an arm piece part, and the tip of the retainer part is characterized in that the pair of side walls are bent to grip and fix the arm piece part.

[0027] In the wiper arm according to the fourth aspect, the arm body has a retainer portion and an arm piece portion. Here, the retainer portion in which the front side wall and the rear side wall are in a stepped state over a predetermined range,
The pair of side walls are bent to grip and fix the arm piece portion. The base end is rotatably supported by the arm head, so that both side walls face each other. in this way,
Even in a configuration where both side walls are bent at the distal end and opposed at the proximal end and twisted from the proximal end to the distal end, the difference in height between the two side walls gradually decreases toward the distal end, so that it has a wind noise reduction effect. In addition, a wiper arm having a tapered shape can be formed smoothly in appearance and in manufacturing.

According to a fifth aspect of the present invention, there is provided a wiper device for a vehicle, comprising a plurality of wiper arms provided along a width direction of the vehicle, for wiping a window glass of the vehicle. The wiper arm according to any one of claims 1 to 4 is applied to a wiper arm located at a center portion in the vehicle width direction among the respective wiper arms.

In the wiper device for a vehicle according to the fifth aspect, the wiper arm located at the center of the vehicle in the vehicle width direction among the plurality of wiper arms provided along the width direction of the vehicle is preferably the one described above. The wiper arm according to any one of Items 4 is applied and attached.

Here, in general, when the wiper device is stopped, the wiper arms are respectively arranged along the width direction of the vehicle, and when the vehicle is running at a high speed, the wiper arm located at the most central portion in the vehicle width direction is attached to the wiper arm. A strong airflow hits (acts) the most from the front, and therefore, a loud wind noise is most likely to occur.

On the other hand, in the vehicle wiper device according to the fifth aspect, the wiper arm according to any one of the first to fourth aspects is applied to and attached to the wiper arm at the corresponding location. Therefore, wind noise during high-speed running of the vehicle can be reduced.

As described above, with the wiper arm according to the fifth aspect, when the speed of the vehicle further increases, the effect of reducing the wind noise at the time of high-speed running can be further exhibited.

[0033]

FIG. 1 shows a vehicle wiper 1 using a wiper arm 12 according to a first embodiment of the present invention.
0 is shown in a perspective view. FIG. 2 is a plan view of the vehicle wiper 10, and FIG.
1 shows a cross-sectional view of the vehicle wiper 10.

The wiper 10 includes a wiper arm 12 and a wiper blade 30 held by the wiper arm 12.

The wiper arm 12 has an arm head 14. One end of the arm head 14 is fixed to a pivot shaft (not shown) serving as a rotation shaft provided in the vehicle, and always rotates together with the pivot shaft. The other end of the arm head 14 is connected to a retainer 16 constituting an arm body via a support shaft 17 so as to be rotatable by a predetermined angle.

The retainer 16 has a pair of side walls 18 and 20 facing each other, and these side walls 18 and 20
The upper end of the arm head 1 is formed in a U-shaped cross-section with one side opened by an upper wall 22 continuous between the upper ends of the arm head 1 with the opening side facing a wiping surface such as a windshield glass.
4 is supported.

The length (height) of the side wall 18 and the side wall 20 and the width of the upper wall 22 of the retainer 16 are adjusted from the distal end side in the longitudinal direction to the base end side (the side of the arm head 14).
It is formed gradually larger and has a tapered shape as a whole.

Further, the pair of side walls 18 and 20 of the retainer 16 are formed such that a front edge portion 18A and a front edge portion 20A are close to each other over a predetermined range in the longitudinal direction of the retainer 16. Further, FIG.
As shown in detail in FIG. 1, a pair of side walls 18 and 20 formed close to each other ,
The height H ₁ from the upper wall 22 of the front end edge portion 20A of the side wall 20 of the rear side located downstream of the relative air current flowing toward the front side to the windshield glass, the front side which is located upstream of the relative air flow is set lower than the height H ₂ of the upper wall 22 of the front end edge portion 18A of the side walls _{18 (H 1 <H 2)} .

In this case, in the first embodiment, as shown in FIG. 6, the length L ₁ of the downstream side wall 20 is set.
Is the same as the length L ₂ of the upstream side wall 18 (L ₁ = L
₂ ), and the angle θ ₁ formed between the downstream side wall 20 and the upper wall 22 is such that the upstream side wall 18 is
Is smaller (θ ₁ <θ ₂₎ setting than the angle theta ₂ which forms. In this way, even if the height of both side walls is the same, by changing the angle , the downstream side wall 20 is stepped with respect to the upstream side wall 18, that is, above the leading edge 20 A of the downstream side wall 20. the height H ₁ from the wall 22, the upper
Upper wall 22 of tip edge portion 18A on flow side wall 18
Since it lower than the height H ₂ of the can without conventional stepped state (of the side walls the same height) used in common materials and type of the wiper arm.

Here, the rear side wall 20 as described above is used.
Between the height H _1, the difference between the height H ₂ of the front side wall 18 (H
₂ -H ₁ ) is set to be gradually larger from the tip end side of the retainer 16 (the part shown in FIG. 5A) to the side of the arm head 14 (the part shown in FIG. 5B) as shown in FIG. I have. In other words, the side wall 20 on the base end side of the retainer 16 is smaller than the step X (shown in FIG. 5A) between the front edge 20A of the side wall 20 and the front edge 18A of the side wall 18 on the longitudinal front side of the retainer 16. Step Y between the front edge portion 20A of the front end portion 18A and the front edge portion 18A of the side wall 18 (FIG. 5B).
(Shown) is formed larger.

A spring 24 as an elastic means is stretched between the retainer 16 having the above structure and the arm head 14, and constantly biases the retainer 16 toward the wiping surface such as a windshield glass. .

An arm piece 26, which forms an arm together with the retainer 16, is fixed to the tip of the retainer 16. In this case, at the distal end of the retainer 16, the pair of side walls 18 and 20 described above are bent and gripped at the base end of the arm piece 26 to be integrally connected and fixed.

The tip of the arm piece 26 is bent into a substantially U-shape to form a holding portion 28.
Are connected and held via a clip member (not shown).

On the other hand, the wiper blade 30 is composed of a blade rubber 32 that contacts and wipes the wiping surface, and a plurality of holding levers 34 that hold the blade rubber 32. Is held.

Next, the operation of the first embodiment will be described. In the vehicle wiper 10 using the wiper arm 12 having the above configuration, the wiper arm 12 and the wiper blade 3
By the reciprocating rotation of the blade 0, the blade rubber 32 is rotated in a state of being in close contact with the windshield glass surface to wipe off raindrops and the like.

The wiper arm 12 of the vehicle wiper 10 includes a pair of side walls 18 facing each other, a side wall 20 and an upper wall 22, and a retainer 16 which constitutes an arm body. 18 and the side wall 20, the leading edge 18A and the leading edge 20A approach each other over a predetermined range in the longitudinal direction.
It is formed. Furthermore, of the pair of side walls 18 and 20 formed close to each other, the front edge portion 2 of the rear side wall 20 located downstream of the relative airflow.
The height H ₁ from the top wall 22 of 0A is, the leading edge portion 1 in the front side wall 18 located on the upstream side of the relative air flow
It is set lower than the height H ₂ of from the top wall 22 of _{8A (H 1 <H 2)} .

In other words, in other words, the retainer 16 constituting the arm body has the distal edge portion 18A and the distal edge portion 20A formed close to each other over a predetermined range in the longitudinal direction so as to form an inverted triangular cross section as a whole. The rear side wall 20 is positioned such that the front edge 20A is closer to the upper wall 22 than the front side wall 18 in a stepped state of a predetermined size. Further, the front edge portions 18 of the both side walls
A, since the leading edge portion 20A the distance K of the opening between the side walls close to each other is smaller, also suppressed airflow from entering the opening.

Therefore, even if the high-speed airflow hits the wiper arm 12 (retainer 16), the high-speed airflow does not hit the front side wall 18 located on the upstream side perpendicularly, but rather from the front side wall 18 to the rear side wall. The air flows smoothly without turbulence along the flow path 20, and vortices hardly occur in the first place behind the front side wall 18. As described above, since the eddy current is unlikely to be generated, the eddy current does not hit the rear side wall 76 as in the related art, so that high-frequency vibration called a cavity tone (edge tone) does not occur. Also, like this on the upstream side
The eddy current hardly occurs behind the front side wall 18 located at the front side, and in particular, the intrusion of the air current into the inside of the both side walls 18 and 20 can be largely suppressed, so that the wind noise due to the eddy current itself hardly occurs.

The wiper arm 1 of the vehicle wiper 10
2, in the side wall 18 and the side wall 20 of the retainer 16 which are stepped with each other over a predetermined range in the longitudinal direction, the front edge portion 20A of the side wall 20 and the front edge of the side wall 18 on the longitudinal front side of the retainer 16 The step Y between the distal edge portion 20A of the side wall 20 and the distal edge portion 18A of the side wall 18 on the base end side of the retainer 16 is larger than the step X from the portion 18A (illustrated in FIG. 5A). ) Is formed larger. For this reason, in order to secure the strength and rigidity and the driver's view, the lengths (heights) of the side walls 18 and the side walls 20 of the retainer 16 and the width dimension of the upper wall 22 are changed from the front end side in the longitudinal direction to the base end side (arm head). 14) (in other words, the base end of the retainer 16 has a large height dimension and a large width dimension and is likely to generate eddy currents). However, at the base end side of this retainer 16 (on the side of the arm head 14), the step between the side wall 20 and the side wall 18 corresponds to the upper wall 22 which gradually widens toward the base end side of the retainer 16 as described above. As a result, the effect of preventing eddy current generation (cavity tone preventing effect) does not decrease.

As described above, in the wiper arm 12 (vehicle wiper 10) according to the first embodiment, the upper wall width dimension (W ₁ <) of the retainer 16 that gradually increases toward the base end side.
W ₂ ), the level difference is gradually increased, and the wind noise during high-speed running of the vehicle can be significantly reduced.

Further, in the wiper arm 12, at the tip of the retainer 16, the above-described pair of side walls 18 are provided.
Further, the side wall 20 is bent and the base end of the arm piece 26 is gripped to be integrally connected and fixed. The base end is pivotally supported by the arm head 14 so that both side walls are opposed to each other. As described above, even in a configuration in which both side walls are bent at the distal end and opposed at the proximal end and twist is present from the proximal end to the distal end, the difference in height between the both side walls is gradually reduced toward the distal end, so that wind noise is reduced. The wiper arm 12 having a tapered shape can be configured to have an effect and to be smooth in appearance and in manufacturing.

In the wiper arm 12 (retainer 16) according to the first embodiment described above, the length L ₁ of the side wall 20 is the same as the length L ₂ of the side wall 18 and the angle θ
_By setting ₁ smaller than the angle θ ₂ , the height H
₁ is lower than the height H _2, but is not limited to this, and the angle θ ₁ is the same as the angle θ ₂ and the length L ₁ of the side wall 20 is smaller than the length L ₂ of the side wall 18. The height H ₁ may be lower than the height H ₂ by setting the length to be shorter, or the length dimension L ₁ of the side wall 20 may be changed to the side wall 1.
8 is set shorter than the length L ₂ and the angle θ ₁
Angle theta ₂ may be configured to be lower than set smaller height H ₁ is the height H ₂ than.

Next, another embodiment of the present invention will be described. Note that components that are basically the same as those in the first embodiment are given the same reference numerals as in the first embodiment, and descriptions thereof are omitted.

FIG. 7 is a sectional view of the retainer 44 of the wiper arm 42 according to the second embodiment.

The retainer 44 includes a side wall 46 and a side wall 4.
8 and an upper wall 50 continuous between the upper ends of the side walls 46 and 48 have a U-shaped cross section (a shape in which a pair of side walls 46 and side walls 48 face each other in a parallel state) with one side opening. It is rotatably supported by the arm head 14 with the opening side facing a wiping surface such as a windshield glass.

The pair of side walls 46 and 48 of the retainer 44 are separated from the upper wall 50 of the leading edge portion 48A of the rear side wall 48 located downstream of the relative airflow over a predetermined range in the longitudinal direction. height H ₁ is set lower than the height H ₂ of the upper wall 50 of the front end edge portion 46A of the side wall 46 of the front side located upstream of the relative air flow (H ₁ <H _2). That is, in the wiper arm 42 (retainer 44) according to the second embodiment, the front edge portion 48A of the rear side wall 48 extends over a predetermined range.
Is located closer to the upper wall 50 than the front edge 46A of the front side wall 46, and is positioned in a stepped state of a predetermined dimension with respect to the front edge 46A of the front side wall 46. I have.

Here, the rear side wall 48 as described above is used.
Between the height H _1, the difference between the height H ₂ of the front side wall 46 (H
₂ -H ₁ ) is set to be gradually larger continuously from the distal end side of the retainer 44 (the part shown in FIG. 7A) to the side of the arm head 14 (the part shown in FIG. 7B). In other words, the side wall 48 on the base end side of the retainer 44 is smaller than the step X (shown in FIG. 7A) between the front edge portion 48A of the side wall 48 and the front edge portion 46A of the side wall 46 on the longitudinal front side of the retainer 44. A step Y (illustrated in FIG. 7B) between the leading edge portion 48A of the first portion and the leading edge portion 46A of the side wall 46 is formed larger.

The wiper arm 4 according to the second embodiment
In 2 (retainer 44), when the high-speed airflow hits the wiper arm 42 (retainer 44) and passes behind the front side wall 46 located on the upstream side, the airflow is deflected.
Since the rear surface (located on the downstream side of the relative air flow) of the side wall height H ₁ of 48 is set according to the width of the upper wall 50 of the retainer 44, the air flow passing through hardly hit the side wall 48 of the rear side This makes it difficult to induce high-frequency vibration called cavity tone (edge tone).

The wiper arm 42 (retainer 44)
Then, in the side walls 46 and the side walls 48 of the retainer 44 which are stepped with each other over a predetermined range, the retainer 44
Step X between the front edge portion 48A of the side wall 48 and the front edge portion 46A of the side wall 46 at the longitudinal front side of FIG.
Side wall 48 on the proximal end side of the retainer 44 as shown in FIG.
Edge portion 48A of the end and the edge portion 46A of the side wall 46
7 (shown in FIG. 7B) is formed larger. For this reason, the length (height) of the side wall 46 and the side wall 48 of the retainer 44 and the width dimension of the upper wall 50 in order to secure the strength rigidity and the driver's visibility, and the width dimension of the upper wall 50 from the front end side in the longitudinal direction to the base end side (arm head) 14 side) (in other words, even if the base end of the retainer 44 is a portion where both the height dimension and the width dimension are formed large and a vortex is likely to be generated), the retainer 44 As described above, the step between the side wall 48 and the side wall 46 is gradually increased on the base end side (the side of the arm head 14) according to the width of the upper wall 50 of the retainer 44. The effect (cavity tone prevention effect) does not decrease.

As described above, with the wiper arm 42 (retainer 44) according to the second embodiment, the wind noise during high-speed running of the vehicle can be significantly reduced.

FIG. 8 is a sectional view of the retainer 54 of the wiper arm 52 according to the third embodiment.

The retainer 54 includes a side wall 56 and a side wall 5.
8 and an upper wall 59 continuous between the upper ends of the side walls 56 and the side walls 58, and is basically the same as the retainer 44 of the wiper arm 42 according to the second embodiment described above. The pair of side walls 56 and 58 are formed in a C-shape in cross section (a divergent shape).

The pair of side walls 56 and the side walls 58 of the retainer 54 extend over a predetermined range in the longitudinal direction from the upper wall 59 of the leading edge portion 58A of the rear side wall 58 located downstream of the relative airflow. height H ₁ is set lower than the height H ₂ of the upper wall 59 of the front end edge portion 56A of the side wall 56 of the front side located upstream of the relative air flow (H ₁ <H _2).

Here, the rear side wall 58 as described above is used.
Between the height H _1, the difference between the height H ₂ of the side wall 56 of the front side (H
₂ -H ₁ ) is set to be gradually larger continuously from the tip end side of the retainer 54 (the part shown in FIG. 8A) to the side of the arm head 14 (the part shown in FIG. 8B).
4 a distal edge portion 58A of the side wall 58 on the longitudinal distal side
Step X between the side wall 56 and the front edge 56A of the side wall 56 (FIG.
The step Y (shown in FIG. 8B) between the leading edge portion 58A of the side wall 58 and the leading edge portion 56A of the side wall 56 on the base end side of the retainer 54 is larger than that shown in FIG.

The wiper arm 5 according to the third embodiment
2 (retainer 54), when the high-speed airflow hits the wiper arm 52 (retainer 54) and passes behind the front side wall 56 located on the upstream side, the airflow is deflected. Side wall 5 located downstream of
Since the height H ₁ of 8 is set according to the width of the upper wall 59 of the retainer 54, the side walls of the air flow passing through the rear side 5
8, which makes it difficult to induce a high-frequency vibration called a cavity tone (edge tone).

The wiper arm 52 (retainer 54)
In the side wall 56 and the side wall 58 of the retainer 54 which are stepped with each other over a predetermined range in the longitudinal direction, the front edge portion 58A of the side wall 58 and the front edge portion of the side wall 56 on the longitudinal front side of the retainer 54. A step Y between the leading edge portion 58A of the side wall 58 and the leading edge portion 56A of the side wall 56 on the base end side of the retainer 54, as compared with a step X with the 56A (see FIG. 8A). Of the retainer 54 to secure the strength and rigidity and the driver's visibility.
(The height of the upper wall 59) and the width dimension of the upper wall 59 are gradually increased from the distal end side in the longitudinal direction to the base end side (the side of the arm head 14) (in other words, the base end of the retainer 54). (Even if the portion has a large height dimension and a large width dimension and eddy currents are easily generated), the effect of preventing eddy current generation (cavity tone preventing effect) is reduced as in the second embodiment. There is no.

As described above, in the wiper arm 52 (retainer 54) according to the third embodiment, the wind noise during high-speed running of the vehicle can be significantly reduced.

Next, FIG. 9 schematically shows the entire structure of a vehicle wiper device 60 according to a fourth embodiment, when the windshield glass 62 of the vehicle is viewed from the front side.

In this vehicle wiper device 60, a pivot shaft 64 and a pivot shaft 66 are provided along the width direction of the vehicle, and further, the pivot shaft 64 and the pivot shaft 6 are provided.
A wiper arm 68 and a wiper arm 70 are attached to 6 respectively. Of the wiper arm 68 and the wiper arm 70, the wiper arm 70 according to the first embodiment described above or the wiper arm 42 according to the second embodiment is applied to the wiper arm 70 located at the center in the vehicle width direction. It is configured.

Here, in general, when the wiper device is stopped, a plurality of wiper arms (wiper arm 68, wiper arm 70) are respectively arranged along the width direction of the vehicle. A strong airflow hits (acts) the windshield arm located at the center from the front most, and therefore, a loud wind noise is most likely to be generated.

On the other hand, in the vehicle wiper device 60 according to the fourth embodiment, the wiper arm 70
The wiper arm 1 according to the first embodiment described above
2, or the wiper arm 42 according to the second embodiment
Is applied, the wind noise during high-speed running of the vehicle can be reduced most effectively.

As described above, in the vehicle wiper device 60 according to the fourth embodiment, when the speed of the vehicle is further increased, the effect of reducing the wind noise at the time of high-speed running can be further exhibited. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of a vehicle wiper using a wiper arm according to a first embodiment of the present invention.

FIG. 2 is a plan view showing an overall configuration of a vehicle wiper using the wiper arm according to the first embodiment of the present invention.

FIG. 3 is a side view showing the overall configuration of a vehicle wiper using the wiper arm according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view showing an overall configuration of a vehicle wiper using the wiper arm according to the first embodiment of the present invention.

5A and 5B show a shape of a retainer of the wiper arm according to the first embodiment of the present invention, wherein FIG. 5A is a cross-sectional view taken along line AA of FIG. 3, and FIG. It is sectional drawing which followed the -B line.

FIG. 6 is a sectional view showing a shape of a retainer of the wiper arm according to the first embodiment of the present invention.

FIG. 7 is a sectional view showing a shape of a retainer of a wiper arm according to a second embodiment of the present invention.

FIG. 8 is a sectional view showing a shape of a retainer of a wiper arm according to a third embodiment of the present invention.

FIG. 9 is a schematic front view showing the entire configuration of a vehicle wiper device according to a fourth embodiment of the present invention, and viewing a windshield glass of a vehicle from a front side.

FIG. 10 is a sectional view showing a shape of a retainer of a conventional wiper arm.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vehicle wiper 12 Wiper arm 14 Arm head 16 Retainer (arm body) 18 Side wall 20 Side wall 22 Upper wall 24 Spring (elastic means) 26 Arm piece (Arm body) 30 Wiper blade 42 Wiper arm 44 Retainer (Arm body) 46 Side wall 48 Side wall Reference Signs List 50 upper wall 52 wiper arm 54 retainer (arm body) 56 side wall 58 side wall 60 vehicle wiper device 62 windshield glass 64 pivot shaft 66 pivot shaft 68 wiper arm 70 wiper arm

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshinori Hitomi 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Masayuki Okano 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Kazutoshi Kinoshita 100 Kanayama, Ichiriyama-cho, Kariya-shi, Aichi Prefecture Inside Toyota Auto Body Co., Ltd. (56) References JP-A-60-157946 (JP, A) JP-A-6-71342 (JP, U.S.A.) ) Japanese Utility Model Showa 59-66652 (JP, U) Japanese Utility Model Hei 4-52958 (JP, U) Japanese Utility Model Showa 58-135353 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60S 1/04-1/60

Claims (5)

(57) [Claims] 1. A U-shaped cross section having one side opened by an arm head fixed to a rotating shaft provided in a vehicle, a pair of side walls facing each other, and an upper wall continuous between upper ends of the side walls. And a width of the upper wall is gradually increased from a tip end side to the arm head side, and the arm head is in a state where an opening of the retainer portion is directed to a wiping surface side. An arm body rotatably supported by the arm and a tip end of which is connected to a wiper blade; and an elastic means which is hung over the arm head and the arm body and presses the arm body in a wiping surface direction. A wiper arm, wherein the arm body includes a windshield from a front side of the vehicle when the vehicle is mounted on the pair of side walls of the retainer portion.
Located downstream of the relative airflow flowing toward the glass
Stage the height from the top wall of the leading edge portion of one of the side walls, and the lower than the height from the top wall of the tip edge portion of the other side wall located on the upstream side of the relative air flow
A wiper arm having a stepped portion , and wherein the difference in height between the side walls at the stepped portion is gradually increased continuously from the wiper blade side to the arm head side. 2. An arm fixed to a rotating shaft provided in a vehicle.
Head, a pair of side walls facing each other, and an upper end of the side walls.
When formed on one side with a continuous upper wall,
The width of the upper wall is from the tip side to the arm head side.
And a retainer portion that is gradually enlarged.
With the opening of the container facing the wiping surface,
And a wiper brake at the tip.
Arm is connected to the arm body and the arm head and the arm body.
An elastic means for pressing the arm body in the direction of the wiping surface , wherein the arm body has a tip of a pair of side walls of the retainer portion.
Forming an inverted triangular section with the edges close to each other
And, in the inverted triangular section, the tip edge portion is
Of the pair of side walls approaching each other,
From the front of the vehicle toward the windshield glass.
At one of the side walls located downstream of the relative airflow
The height of the end edge from the upper wall is above the relative airflow.
Of the leading edge on the other side wall located on the flow side
A step portion lower than the height from the upper wall is provided, and the difference in height between the side walls at the step portion is determined by the warp.
Continuously from the side of the Ipa blade to the side of the arm head
A wiper arm characterized by being progressively larger . Wherein the pair of side walls of the cross section inverted triangle section, the angle at which one side wall located on the downstream side of the relative air flow forms with the upper wall, the other located on the upstream side of the relative air flow
Square side walls of the smaller than the angle formed between the upper wall, the wiper arm according to claim 2, wherein a. 4. The arm body has an arm piece fixed to the tip of the retainer and connected to the wiper blade, and the tip of the retainer is formed by bending the pair of side walls. The said arm piece part is gripped and fixed, The Claim 1, Claim 2, or Claim 3 characterized by the above-mentioned.
The described wiper arm. 5. A wiper device for a vehicle having a plurality of wiper arms provided along a width direction of a vehicle and wiping a window glass of the vehicle, wherein the wiper arm is disposed at the center of the wiper arm in the vehicle width direction. A wiper device for a vehicle, wherein the wiper arm according to any one of claims 1 to 4 is applied to a located wiper arm.