JP2005329875A - Wiper arm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper arm that allows an elastic means or the like to be stored and arranged between sidewalls even when a retainer part is set relatively short, and can reduce occurrence of a wind roar. <P>SOLUTION: In the wiper arm 12, the retainer 16 has a plurality of vortex protrusions 23 at a tip edge of a sidewall 20 located on the downstream side of a relative air flow S flowing from the front side of the vehicle toward the window shield glass. Therefore, when the relative air flow S passes the tip edge of the sidewall 20 on the downstream side, a plurality of vortex flows occur on the downstream side (back side of the retainer 16) of the plurality of vortex protrusions 23. Thus, occurrence region (turbulent flow region) of the vortex flows at the back of the retainer 16 entirely becomes small, so that occurrence of large vortex flow at the back of the retainer 16 is suppressed as a whole, and the occurrence of the wind roar caused by the large vortex flow is reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wiper arm used in a vehicle wiper device for wiping a windshield glass of an automobile.

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

  The wiper arm has one end of an arm head fixed to a pivot shaft, and the other end of the arm head is connected via a support shaft so that the retainer can rotate at a predetermined angle in a direction in which the retainer is in contact with and away from the glass surface. Yes. A spring is attached between the arm head and the retainer, and always urges the retainer toward the glass surface side. An arm piece is fixed to the tip of the retainer, and a wiper blade is connected to the tip of the arm piece.

  On the other hand, the wiper blade is configured by a blade rubber that wipes in contact with the glass surface, and a plurality of holding levers that hold the blade rubber.

  When such a vehicle wiper device is operated, the wiper arm and the wiper blade reciprocately rotate, so that the blade rubber moves while closely contacting the glass surface to wipe away raindrops.

  By the way, in such a vehicle wiper device, the retainer 100 is generally formed in a U-shaped cross section having a pair of side walls 102 and 104 as shown in FIG. It is arranged facing. Moreover, since the retainer 100 (wiper arm) is normally positioned in the vehicle width direction during traveling in fine weather, it stands against the traveling wind.

  For this reason, when the retainer 100 is placed in the airflow S as the vehicle travels at a high speed (when the airflow S hits the retainer 100), a large wind noise may occur. That is, when the high-speed air flow S hits the retainer 100, a large eddy current is generated behind the side wall 104 on the rear surface side located downstream of the relative air flow among the side walls 102 and 104 of the retainer 100 formed in a U-shaped cross section. Wind noise was generated due to this large eddy current.

  As a measure for reducing wind noise during such high-speed running, a wiper arm has been devised in which opposing side walls of the retainer are overhanged in a direction approaching each other (see, for example, Patent Document 1). In this wiper arm, the invasion of airflow into the opening between the side walls is prevented, so that the generation of vortex flow is reduced and the generation of wind noise is reduced.

  However, generally, on the base end side of the retainer, a spring or the like for pressing the retainer against the glass surface is accommodated between the pair of side walls. For this reason, since the side wall and the spring interfere with each other when the opposing side walls on the base end side of the retainer are overhanged in a direction approaching each other, the base end side of the retainer is disclosed in Patent Document 1. It is difficult to adopt the structure.

  Especially, a wiper arm with a relatively short retainer part (a pair of side wall parts) (an arm with an integrated structure in which the retainer part and the arm piece are seamless), that is, a pair of side walls is crushed into a flat plate shape at the tip part to form an arm piece part In this case, the ratio of the spring to the length of the retainer portion is large, so it is difficult to adopt the overhang structure as described above.

For this reason, even when the retainer portion is a relatively short wiper arm, a countermeasure that can reduce the generation of wind noise due to a large vortex flow has been demanded.
Japanese Patent Laid-Open No. 11-043019

  In view of the above facts, an object of the present invention is to obtain a wiper arm that can accommodate and dispose elastic means between side walls even when the retainer portion is set to be relatively short, and that can reduce the generation of wind noise.

  In order to solve the above-described problem, a wiper arm according to a first aspect of the present invention includes an arm head fixed to a rotation shaft provided in a vehicle, a pair of side walls facing each other, and upper ends of the side walls. And a retainer portion formed in a U-shaped cross-section with one side opened by an upper wall continuous to the arm head, and is pivotally supported by the arm head in a state where the opening side of the retainer portion faces the wiping surface side. And an arm body to which a wiper blade is connected at the tip, and elastic means that is housed and arranged between the both side walls and is stretched between the arm head and the arm body, and presses the arm body in the wiping surface direction, The arm body is arranged to be long in the width direction of the vehicle in a stopped state, and at least one tip edge portion of the pair of side walls of the retainer portion. , Having a plurality of vortex protrusion relative airflow flowing the direction from the vehicle front side to the wiping surface when the vehicle traveling passes, is characterized in that.

  In the wiper arm according to the first aspect, the arm body includes a retainer portion that is constituted by a pair of side walls facing each other and an upper wall that is continuous between the upper end portions of the side walls and that opens on one side. Between both side walls of the retainer portion, there is accommodated and arranged elastic means that spans between the arm head and the arm body and presses the arm body in the direction of the wiping surface (windshield glass or the like).

  Further, in this wiper arm, the arm body is disposed in the longitudinal direction in the width direction of the vehicle in the stopped state, and at least one of the pair of side walls of the retainer portion is disposed on the front side of the vehicle during traveling of the vehicle. A plurality of eddy current protrusions through which a relative airflow flowing toward the wiping surface passes.

  Here, for example, when a plurality of vortex protrusions are formed at the tip edge portion of the side wall located on the upstream side (vehicle front side) of the relative airflow, when the relative airflow passes through the upstream edge portion, A plurality of small vortex flows are generated on the downstream side of the eddy current projection (between a pair of side walls of the retainer portion). That is, in this wiper arm, a plurality of vortex protrusions actively generate a small vortex by the action of a so-called “vortex generator”, so that the vortex generation region (turbulent flow area) between the pair of side walls of the retainer part as a whole Get smaller. Thereby, as a whole, generation | occurrence | production of a big eddy current between a pair of side walls of a retainer part is suppressed, and generation | occurrence | production of the wind noise resulting from a big eddy current is reduced.

  On the other hand, for example, in the case where a plurality of vortex protrusions are formed at the front edge portion of the side wall located on the downstream side (rear side of the vehicle) of the relative airflow, the relative airflow passes through the downstream edge portion as described above. As in the case of the upstream vortex protrusion, a plurality of small vortex flows are actively generated downstream of the plurality of vortex protrusions (behind the retainer section), and the vortex generation area (turbulent flow area) behind the retainer section. Becomes smaller as a whole. As a result, the generation of a large vortex behind the retainer portion is suppressed as a whole, and the generation of wind noise caused by the large vortex is reduced.

  In addition, in this case, since the generation of a large vortex behind the retainer is suppressed as described above (because the turbulent flow area behind the retainer is reduced), the turbulence of the relative airflow passing below the retainer is also reduced (flow). And the generation of vortex between the pair of side walls of the retainer portion is further suppressed. This also reduces wind noise.

  Thus, in this wiper arm, although the elastic means is accommodated and disposed between the side walls of the arm body (retainer portion), the wind noise reduction structure can also be applied to the elastic means accommodating portion (arm body base end portion). . Therefore, in this wiper arm, even when the retainer portion is set relatively short, the generation of wind noise can be reduced.

  As described above, in the wiper arm according to the first aspect, even when the retainer portion is set to be relatively short, the elastic means and the like can be accommodated between both side walls of the arm body, and the generation of wind noise can be reduced.

  A wiper arm according to a second aspect of the present invention is the wiper arm according to the first aspect, wherein a plurality of surface vortex protrusions are provided on at least one outer surface of the upper wall and the side wall located upstream of the relative airflow. It is characterized by.

  In the wiper arm according to claim 2, the arm body has a plurality of surface vortex protrusions on at least one outer surface of the upper wall of the retainer portion and the side wall located on the upstream side of the relative airflow. For this reason, the airflow passing through the upstream side wall and the upper wall of the retainer portion becomes a small vortex behind the surface vortex protrusion and wraps around the downstream side wall. Thereby, generation | occurrence | production of a big eddy current behind a retainer part is further suppressed, and a wind noise is further reduced.

  The wiper arm according to a third aspect of the present invention is the wiper arm according to the second aspect, wherein at least one of the upper wall and the side wall located on the upstream side is a downward slope whose cross-sectional shape is directed toward the front of the vehicle. It is characterized by that.

In the wiper arm according to the third aspect, at least one of the upper wall of the retainer portion and the side wall located on the upstream side of the relative airflow has a sectional shape that is a downward slope toward the front of the vehicle. Therefore, when the relative airflow that flows from the front side of the vehicle toward the wiping surface hits the descending slope, a downward force (downforce) acts on the retainer portion. Thereby, the retainer part (arm body) can be prevented from being lifted. Wiper arm (retainer)
A smooth flow of airflow can be promoted on the outer surface of the.

<First Embodiment>
FIG. 1 is a perspective view showing the overall configuration of a vehicle wiper 10 to which a wiper arm 12 according to a first embodiment of the present invention is applied. FIG. 2 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 includes an arm head 14. One end of the arm head 14 is fixed to a pivot shaft (not shown) as a rotation shaft provided in the vehicle, and always rotates together with the pivot shaft. A retainer 16 constituting the arm body is connected to the other end of the arm head 14 via a support shaft 17 so as to be rotatable by a predetermined angle in a direction in which the retainer 16 forms a wiping surface.

  The retainer 16 is formed by pressing a metal plate or the like, and has a pair of side walls 18 and 20 facing each other, and an upper wall 22 continuous between the side walls 18 and the upper end portions of the side walls 20. Are formed in a U-shaped cross-section with one side opened. The retainer 16 is pivotally supported by the arm head 14 with the opening side facing the windshield glass, and is elongated in the width direction of the vehicle in a stopped state (when not in use, normally running in fine weather). The configuration is arranged at the stop position (storage position). Moreover, in this state, as shown in FIG. 3, the side wall 18 is disposed on the upstream side (left side in FIG. 3) of the relative airflow S flowing from the front side of the vehicle toward the windshield glass, and on the downstream side (right side in FIG. 3). A side wall 20 is arranged.

  Furthermore, a plurality of vortex protrusions 21 are formed on the tip edge portion (lower end portion in FIGS. 1 to 3) of the side wall 18 of the retainer 16, and the tip edge portion (in FIGS. 1 to 3 in FIG. 1 to FIG. 3). A plurality of vortex protrusions 23 are formed on the lower end. In the first embodiment, the plurality of eddy current protrusions 21 and the plurality of vortex current protrusions 23 each have a continuous waveform along the longitudinal direction of the retainer 16.

  A plurality of surface vortex protrusions 25 are formed on the outer surface of the upper wall 22 of the retainer 16. In the first embodiment, these surface vortex protrusions 25 are substantially V-shaped in a plan view, and the longitudinal direction of the retainer 16 is such that the V-shaped apex (corner portion) faces the vehicle front side. Are arranged at equal intervals along.

  The eddy current protrusion 21, the eddy current protrusion 23, and the surface eddy current protrusion 25 are integrally formed when the retainer 16 is formed.

  On the other hand, as shown in FIG. 2, on the proximal end side (left side in FIG. 2) of the retainer 16, a spring 24 as elastic means is stretched between the retainer 16 and the arm head 14. The spring 24 is accommodated between the pair of side walls 18 and 20 of the retainer 16 and always urges the retainer 16 toward the windshield glass.

  In addition, an arm piece 26 constituting an arm body together with the retainer 16 is fixed to the distal end portion of the retainer 16. The distal end portion of the arm piece 26 is bent into a substantially U shape to form a holding portion 28, and the wiper blade 30 is connected and held via a clip member (not shown). On the other hand, the wiper blade 30 includes a blade rubber 32 that contacts and wipes the wiping surface, and a plurality of holding levers 34 that hold the blade rubber 32, and is rotatably held by the arm piece 26. Yes.

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

  In the vehicle wiper 10 to which the wiper arm 12 having the above-described configuration is applied, the wiper arm 12 and the wiper blade 30 reciprocately rotate to rotate the blade rubber 32 in close contact with the windshield glass surface to wipe away raindrops. .

  Here, the vehicle wiper 10 includes a retainer 16 that includes a pair of side walls 18, a side wall 20, and an upper wall 22 that are opposed to each other to form an arm body. Between the side wall 18 and the side wall 20 of the retainer 16, a spring 24 is housed and disposed so as to be spanned between the arm head 14 and the retainer 16 (arm body) and press the retainer 16 in the direction of the windshield glass. .

  Further, a plurality of vortex protrusions 21 are formed on the tip edge portion of the side wall 18 of the retainer 16, and a plurality of vortex protrusions 23 are formed on the tip edge portion of the side wall 20.

  Therefore, as the vehicle travels at a high speed, as shown in FIG. 3, when the relative airflow (high-speed airflow) S hits the retainer 16 (arm body) and the relative airflow S passes through the tip edge portion of the upstream side wall 18, A plurality of small vortex flows are generated downstream of the plurality of vortex protrusions 21 (between the side wall 18 and the side wall 20). That is, in the wiper arm 12, the plurality of vortex protrusions 21 positively generate a small vortex by the action of a so-called “vortex generator”, and therefore a vortex generation region (turbulence region) between the side wall 18 and the side wall 20. Becomes smaller as a whole. As a result, the generation of a large eddy current between the side wall 18 and the side wall 20 is suppressed as a whole, and the generation of wind noise caused by the large eddy current is reduced.

  Further, when the relative airflow S passes through the tip edge portion of the side wall 20 on the downstream side of the retainer 16, the downstream side of the plurality of vortex protrusions 23 (rear side of the retainer 16) as in the case of the upstream vortex protrusion 21 described above. In this case, a plurality of small vortex flows are positively generated, and the vortex generation region (turbulent flow region) behind the retainer 16 is reduced as a whole. As a result, the generation of a large vortex behind the retainer 16 is suppressed as a whole, and the generation of wind noise caused by the large vortex is reduced.

  In addition, since the generation of a large vortex behind the retainer 16 is suppressed as described above (the turbulent flow area behind the retainer 16 is reduced), the turbulence of the relative airflow S passing below the retainer 16 is also reduced (the flow is reduced). ), The generation of vortex between the pair of side walls 18 and 20 of the retainer 16 is further suppressed. Therefore, the wind noise is further reduced by this.

  In the wiper arm 12, a plurality of surface vortex protrusions 25 are formed on the outer surface of the upper wall 22 of the retainer 16. For this reason, the relative airflow S passing through the upper wall 22 of the retainer 16 becomes a small vortex behind the surface vortex protrusion 25 and wraps around the rear side of the one side wall 20. Thereby, generation | occurrence | production of a big eddy current behind the retainer 16 is further suppressed, and a wind noise is further reduced.

  As described above, the wiper arm 12 has a structure in which the spring 24 is accommodated between the side wall 18 and the side wall 20 of the retainer 16 (arm body), but is also cut off at the spring 24 accommodation site (arm body base end). A sound reduction structure can be applied. Therefore, the wiper arm 12 can reduce the generation of wind noise even when the retainer 16 is set relatively short.

  As described above, in the wiper arm 12 according to the first embodiment, even when the retainer 16 is set relatively short, the spring 24 and the like are provided between the side wall 18 and the side wall 20 of the retainer 16 (arm body). It can be accommodated and the generation of wind noise can be reduced.

  In the first embodiment, the plurality of vortex protrusions 21 or the plurality of vortex protrusions 23 are formed on the tip edge portions of both the pair of side walls 18 and the side walls 20 of the retainer 16. Not limited to this, a configuration may be adopted in which a plurality of eddy current protrusions are provided only on the tip edge portion of one of the side wall 18 and the side wall 20.

Next, another embodiment of the present invention will be described. In addition, about the structure and operation | movement fundamentally the same as the said 1st Embodiment, the same code | symbol as the said 1st Embodiment is attached | subjected and the description is abbreviate | omitted.
<Second Embodiment>
FIG. 4 is a perspective view showing a partial configuration of a retainer 52 that is a constituent member of the wiper arm 50 according to the second embodiment of the present invention.

  In the wiper arm 50, the retainer 52 has basically the same configuration as the retainer 16 according to the first embodiment, but the surface eddy current protrusion 25 according to the first embodiment is omitted. is there. Other components are the same as the wiper arm 12 according to the first embodiment.

  The wiper arm 50 (retainer 52) also has basically the same effects as the wiper arm 12 (retainer 16) according to the first embodiment. However, in this wiper arm 50, the effect of the surface vortex protrusion 25 according to the first embodiment cannot be obtained, but the configuration of the retainer 52 can be simplified correspondingly.

In the second embodiment, the plurality of vortex protrusions 21 or the plurality of vortex protrusions 23 are formed on the tip edge portions of both the pair of side walls 18 and the side walls 20 of the retainer 52. Not limited to this, a configuration may be adopted in which a plurality of eddy current protrusions are provided only on the tip edge portion of one of the side wall 18 and the side wall 20.
<Third Embodiment>
FIG. 5 is a perspective view showing a partial configuration of a retainer 62 that is a component member of the wiper arm 60 according to the third embodiment of the present invention.

  In the wiper arm 60, the retainer 62 has basically the same configuration as the retainer 16 according to the first embodiment, but the surface eddy current protrusion 25 according to the first embodiment is omitted. It is a configuration.

  Further, a plurality of trapezoidal eddy current protrusions 64 are continuously formed on the leading edge portion (lower end portion in FIG. 5) of the side wall 18 of the retainer 62. That is, in the retainer 62, a plurality of V-shaped cutouts are formed at equal intervals along the longitudinal direction of the retainer 16 at the front edge portion of the side wall 18, and the portions between these cutouts are trapezoidal. Eddy current projection 64.

  On the other hand, a plurality of trapezoidal vortex protrusions 66 similar to the vortex protrusions 64 described above are continuously formed on the tip edge portion (lower end portion in FIG. 5) of the side wall 20 of the retainer 62.

  Other components are the same as the wiper arm 12 according to the first embodiment.

  The wiper arm 60 (retainer 62) also has basically the same effects as the wiper arm 50 (retainer 52) according to the second embodiment.

In the third embodiment, the plurality of vortex protrusions 64 or the plurality of vortex protrusions 66 are formed on the tip edge portions of both the pair of side walls 18 and the side walls 20 of the retainer 62. Not limited to this, a configuration may be adopted in which a plurality of eddy current protrusions are provided only on the tip edge portion of one of the side wall 18 and the side wall 20.
<Fourth embodiment>
FIG. 6A is a perspective view showing a partial configuration of a retainer 72 that is a constituent member of a wiper arm 70 according to a fourth embodiment of the present invention. FIG. 6B shows a cross-sectional view of the retainer 72.

  In this wiper arm 70, the retainer 72 has basically the same configuration as the retainer 16 according to the first embodiment. However, the retainer 52 according to the second embodiment and the third embodiment are the same. Like the retainer 62 according to the embodiment, the surface vortex protrusion 25 according to the first embodiment is omitted.

  In addition, a plurality of semicircular vortex protrusions 74 and vortex protrusions 76 are formed on the tip edge portion of the side wall 18 of the retainer 72 (the lower end portion in FIGS. 6A and 6B). Yes. The vortex protrusions 74 and the vortex protrusions 76 are alternately arranged adjacent to each other along the longitudinal direction of the retainer 72. Furthermore, the vortex protrusion 74 is inclined by a predetermined angle toward the vehicle front side (upstream side of the relative airflow, left side in FIG. 6B) with respect to the side wall 18 (bent toward the vehicle front side). The vortex protrusion 76 is inclined at a predetermined angle with respect to the side wall 18 toward the vehicle rear side (the downstream side of the relative airflow, the right side in FIG. 6B) (bent toward the vehicle rear side).

  On the other hand, at the tip edge portion of the side wall 20 of the retainer 72 (not shown in FIG. 6A, the lower end portion in FIG. 6B), the vortex projection 78 having the same configuration as the vortex projection 74, and the A plurality of vortex protrusions 79 having the same configuration as the vortex protrusions 76 are continuously formed (the vortex protrusions 78 and the vortex protrusions 79 are alternately arranged along the longitudinal direction of the retainer 72). In this case, the vortex protrusion 78 is inclined at a predetermined angle with respect to the side wall 20 toward the front side of the vehicle, and the vortex protrusion 79 is inclined at a predetermined angle with respect to the side wall 20 toward the rear side of the vehicle.

  Other components are the same as the wiper arm 12 according to the first embodiment.

  The wiper arm 70 (retainer 72) also has basically the same functions and effects as the wiper arm 50 (retainer 52) according to the second embodiment and the wiper arm 60 (retainer 62) according to the third embodiment. Play.

In the fourth embodiment, the plurality of vortex protrusions 74 and 76 or the plurality of vortex protrusions 78 and 79 are formed on the tip edge portions of both the pair of side walls 18 and the side walls 20 of the retainer 62. However, the present invention is not limited to this, and a plurality of eddy current protrusions may be provided only on the tip edge portion of one of the side wall 18 and the side wall 20.
<Fifth embodiment>
FIG. 7 is a perspective view showing a partial configuration of a retainer 82 that is a constituent member of a wiper arm 80 according to the fifth embodiment of the present invention.

  In this wiper arm 80, the retainer 82 has basically the same configuration as that of the retainer 16 according to the first embodiment, but the outer surface of the upper wall 22 has the same structure as that of the first embodiment. Instead of the surface vortex protrusion 25, a plurality of cylindrical surface vortex protrusions 84 are formed.

  Other components are the same as the wiper arm 12 according to the first embodiment.

  The wiper arm 80 (retainer 82) also has basically the same effects as the wiper arm 12 (retainer 16) according to the first embodiment.

In the fifth embodiment, the plurality of vortex protrusions 21 or the plurality of vortex protrusions 23 are formed on the tip edge portions of both the pair of side walls 18 and the side walls 20 of the retainer 82. Not limited to this, a configuration may be adopted in which a plurality of eddy current protrusions are provided only on the tip edge portion of one of the side wall 18 and the side wall 20.
<Sixth Embodiment>
FIG. 8 shows a cross-sectional view of a retainer 87 which is a constituent member of the wiper arm 86 according to the sixth embodiment of the present invention.

  In the wiper arm 86, the retainer 87 has basically the same configuration as the retainer 12 according to the first embodiment, and includes a pair of side walls 88 and 89 facing each other, An upper wall 90 is provided between the upper ends of the side walls 89. However, the upper wall 90 is bent at the intermediate portion in the width direction (left and right direction in FIG. 8), and the cross-sectional shape of the vehicle front side (left side in FIG. 8) is a downward slope toward the vehicle front side. Has been.

  Further, on the upper wall 90, a plurality of surface eddy currents having the same configuration as that of the plurality of surface eddy current protrusions 25 according to the first embodiment are formed on the outer surface of the portion that is the downward slope toward the vehicle front side. A protrusion 25 is provided.

  In addition, a plurality of eddy current protrusions 21 having the same configuration as the plurality of eddy current protrusions 21 according to the first embodiment are formed at the leading edge portion of the side wall 88 located on the upstream side of the relative air flow S. A plurality of vortex protrusions 23 having the same configuration as the plurality of vortex protrusions 23 according to the first embodiment are formed at the leading edge portion of the side wall 89 located on the downstream side of the airflow S.

  Other components are the same as the wiper arm 12 according to the first embodiment.

  The wiper arm 86 (retainer 87) also has basically the same effects as the wiper arm 12 (retainer 16) according to the first embodiment.

  In addition, since the cross-sectional shape of the upper wall 90 is partially a downward slope toward the vehicle front side, when the relative airflow S flowing from the vehicle front side toward the windshield glass hits the downward slope, the retainer A downward force (down force) acts on 87. Thereby, the retainer 87 can be prevented from being lifted. Moreover, the smooth flow of the relative airflow S can be promoted on the outer surface of the wiper arm 86 (retainer 87).

In the sixth embodiment, the plurality of vortex protrusions 21 or the plurality of vortex protrusions 23 are formed on the tip edge portions of both the pair of side walls 88 and 89 of the retainer 87. Not limited to this, a configuration may be adopted in which a plurality of eddy current protrusions are provided only at the tip edge portion of one of the side wall 88 and the side wall 89. Further, the surface vortex protrusion 25 may be omitted.
<Seventh embodiment>
FIG. 9 is a cross-sectional view of a retainer 92 that is a component member of the wiper arm 91 according to the seventh embodiment of the present invention.

  In the wiper arm 91, the retainer 92 has basically the same configuration as the retainer 12 according to the first embodiment, and includes a pair of side walls 93 and side walls 94 facing each other, and the side walls 93. An upper wall 95 is provided between the upper ends of the side walls 94.

  However, the side wall 93 and the upper wall 95 located on the upstream side of the relative airflow S are curved and are continuous in a cross-sectional arc shape, and the cross-sectional shape as a whole is a downward slope toward the vehicle front side. .

  Furthermore, a plurality of surface eddy current protrusions 25 having basically the same configuration as the plurality of surface eddy current protrusions 25 according to the first embodiment are provided on the outer surface of the continuous portion of the upper wall 95 and the side wall 93. It has been. The plurality of surface vortex protrusions 25 are curved corresponding to the curvature of the upper wall 95 and the side wall 93.

  Further, a plurality of vortex protrusions 21 having the same configuration as the plurality of vortex protrusions 21 according to the first embodiment are formed at the leading edge portion of the side wall 93 located on the upstream side of the relative airflow S. A plurality of vortex protrusions 23 having the same configuration as the plurality of vortex protrusions 23 according to the first embodiment are formed at the leading edge portion of the side wall 94 located on the downstream side of the airflow S.

  Other components are the same as the wiper arm 12 according to the first embodiment.

  The wiper arm 91 (retainer 92) has basically the same effects as the wiper arm 86 (retainer 87) according to the sixth embodiment.

  In the seventh embodiment, the plurality of vortex protrusions 21 or the plurality of vortex protrusions 23 are formed on the tip edge portions of both the pair of side walls 93 and side walls 94 of the retainer 92. Not limited to this, a configuration may be adopted in which a plurality of vortex protrusions are provided only at the tip edge portion of one of the side wall 93 and the side wall 94. Further, the surface vortex protrusion 25 may be omitted.

  Furthermore, in the first embodiment, the second embodiment, the fifth embodiment, the sixth embodiment, and the seventh embodiment, the shapes of the vortex protrusions 21 and 23 are corrugated. In the third embodiment, the shape of the vortex protrusions 64 and 66 is a trapezoid, and in the fourth embodiment, the shapes of the vortex protrusions 74 and 76 and the vortex protrusions 78 and 79 are half. Although the circular shape and the configuration in which these are alternately bent in the longitudinal direction of the vehicle are used, the shape of the eddy current protrusion is not limited to this, and the flow of the relative airflow due to the difference in the arrangement of the vehicle wiper 10 or the shape of the vehicle body, etc. It is preferable to change the setting as appropriate according to the difference.

  Further, in the first embodiment, the sixth embodiment, and the seventh embodiment, the shape of the surface eddy current projection 25 is substantially V-shaped in plan view, and in the fifth embodiment, the surface eddy current is formed. Although the shape of the protrusion 84 is a columnar shape, the shape of the surface eddy current protrusion is not limited to this. It is preferable to change the setting.

  Furthermore, in the arm head 14 according to the first to seventh embodiments, a plurality of eddy current protrusions may be provided at the leading edge portions (lower end portions) of the pair of side walls. A plurality of surface vortex protrusions may be provided on the outer surface of the head 14. If comprised in this way, since generation | occurrence | production of the big eddy current between a pair of side walls of the arm head 14 and the back can be suppressed, a wind noise can further be reduced.

  Furthermore, in the wiper blade 30 according to the first to seventh embodiments, a plurality of swirl protrusions may be provided at the tip edge portions of the pair of side walls of the plurality of holding levers 34. A plurality of surface vortex protrusions may be provided on the outer surface of the plurality of holding levers 34. If comprised in this way, since generation | occurrence | production of a big eddy current between a pair of side walls and the back of several holding lever 34 can be suppressed, a wind noise can further be reduced.

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. It is sectional drawing which shows the whole structure of the wiper for vehicles in which the wiper arm which concerns on the 1st Embodiment of this invention was used. It is sectional drawing along the AA line of FIG. 2 which shows the retainer of the wiper arm which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the partial structure of the retainer of the wiper arm which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the partial structure of the retainer of the wiper arm which concerns on the 3rd Embodiment of this invention. The retainer of the wiper arm which concerns on the 4th Embodiment of this invention is shown, (A) is a perspective view which shows the partial structure of this retainer, (B) is sectional drawing of this retainer. It is a perspective view which shows the partial structure of the retainer of the wiper arm which concerns on the 5th Embodiment of this invention. It is sectional drawing which shows the structure of the retainer of the wiper arm which concerns on the 6th Embodiment of this invention. It is sectional drawing which shows the structure of the retainer of the wiper arm which concerns on the 7th Embodiment of this invention. It is sectional drawing which shows the retainer of the conventional wiper arm.

Explanation of symbols

  10 .. wiper, 12 .. wiper arm, 14 .. arm head, 16 .. retainer (arm body), 18 .. upstream side wall, 20 .. downstream side wall, 21 .. vortex protrusion, 22. Upper wall, 23 .. Eddy current protrusion, 25 .. Surface eddy current protrusion, 24 .. Spring, 26 .. Armpiece (arm body), 30-Wiper blade, 50-Wiper arm, 52-Retainer, 60- Wiper arm, 62 .... Retainer, 64 ... Eddy current projection, 66 ... Eddy current projection, 70 ... Wiper arm, 72 ... Retainer, 74 ... Eddy current projection, 76 ... Eddy current projection, 78 ... Eddy current projection, 79 ... Eddy current projection, 80 ... wiper arm, 82 ... retainer, 84 ... surface eddy projection, 86 ... wiper arm, 87 ... retainer, 88 ... upstream side wall, 89 ... downstream side wall, 90 ... Wall, 91 ... wiper arm, 92 ... retainer sidewall 93 ... upstream, 94 ... downstream side wall of the, 95 ... on the walls, S ... relative airflow

Claims (3)

An arm head fixed to a rotating shaft provided in the vehicle;
It has a retainer portion formed in a U-shaped cross-section with one side opened by a pair of side walls facing each other and an upper wall continuous between the upper end portions of both side walls, and the opening side of the retainer portion is directed to the wiping surface An arm body that is pivotally supported by the arm head in a state of facing and having a wiper blade connected to the tip;
Elastic means that is housed and arranged between the side walls and spans between the arm head and the arm body, and presses the arm body in the wiping surface direction;
A wiper arm comprising:
The arm body is arranged in the longitudinal direction in the width direction of the vehicle in a stopped state, and at least one tip edge portion of the pair of side walls of the retainer portion is disposed on the front side of the vehicle when the vehicle travels. A plurality of vortex protrusions through which a relative airflow flowing toward the wiping surface passes,
A wiper arm characterized by that.   2. The wiper arm according to claim 1, further comprising a plurality of surface vortex protrusions on an outer surface of at least one of the upper wall and the side wall located upstream of the relative airflow.   3. The wiper arm according to claim 2, wherein at least one of the upper wall and the side wall located on the upstream side has a cross-sectional shape of a downward slope toward the front of the vehicle.

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