JP2005014765A - Wiper device and attack angle setting method of wiper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper device capable of setting fluctuation of an attack angle in a proper area without lowering appearance quality and an attack angle setting method of the wiper device. <P>SOLUTION: An arm member 16 is formed by bending by a specified angle θ1 around an axis with a height direction of the arm member 16 as an axial direction and by a specified angle θ3 around an axis with a widthwise direction of the arm member 16 as an axial direction at a bent part 62. Additionally, the side of an arm part 60 of the bent part 62 is torsionally formed by a specified angle θ2 around a third axis L3 along the longitudinal direction of the arm part 60 relative to the side of a base part 22. Consequently, a second axis L2 on the arm part 60 is three-dimensionally inclined at a specified angle relative to a first axis L1 on the base part 22. It is possible to set fluctuation of the attack angle in the proper area by properly setting this three-dimensional inclination. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wiper device for wiping a windshield of a vehicle with a blade rubber of a wiper blade, and an attack angle setting method for such a wiper device.
[0002]
[Prior art]
A wiper device is employed as a mechanism for wiping a windshield such as a windshield glass or rear glass of a vehicle. In this type of wiper device, an arm head of a wiper arm is generally attached to a pivot shaft that reciprocally rotates by the driving force of a motor, and an arm member is attached to the glass surface of the wind glass at the tip of the arm head. It is connected so as to be rotatable in the direction of contact and separation.
[0003]
Further, a wiper blade is connected to the tip of the arm member. The wiper blade is provided with a rubber material or a blade rubber having elasticity similar to that of the rubber material, and the blade rubber is attached to the glass surface of the wind glass by the urging force of the tension coil spring stretched between the arm head and the arm member. Pressure contact. In this pressure contact state, the glass surface is wiped by reciprocatingly rotating the wiper blade on the glass surface by the driving force of the motor.
[0004]
By the way, in order to obtain good wiping performance when wiping the glass surface with such a wiper device, it is preferable to rotate the wiper blade on the glass surface while the wiper blade is in a posture perpendicular to the glass surface. It is known.
[0005]
However, the glass surface of the window glass of the vehicle is often a curved surface. For this reason, it is extremely difficult to make the wiper blade posture constant regardless of the position of the wiper blade on the glass surface, and the wiper blade posture is perpendicular to the glass surface at a specific rotational position on the glass surface. Even if it sets so that it may become, the wiper blade will rotate, and the attitude | position of a wiper blade will change from a vertical attitude | position by the rotation position changing. The contact angle of the blade rubber changes with such a change in the attitude of the wiper blade.
[0006]
The attitude angle of the wiper blade with respect to the normal of the glass surface at the contact position of the blade rubber is called an “attack angle”. In order to obtain good wiping performance with the blade rubber over the entire wiping range of the blade rubber, the variation range of the attack angle must be set within a predetermined angle range.
[0007]
Here, in Patent Document 1 below, the axial direction of the pivot shaft is inclined with respect to the surface of the vehicle body. In order to incline the axial direction of the pivot shaft with respect to the vehicle body surface in this way, in the technique disclosed in Patent Document 1, a cylindrical eccentric sleeve whose penetrating direction is inclined with respect to the vehicle body surface is provided, and the pivot shaft is It penetrates the eccentric sleeve.
[0008]
On the other hand, for example, in Patent Document 2 below, the longitudinal direction of the retainer is set as the axial direction on the distal end side with respect to the longitudinal base end side of the retainer (referred to as “arm head” in Patent Document 2). A “twist” around the axis is added. When an arm piece is attached to such a retainer and a wiper blade is further attached, the contact angle of the blade rubber with respect to the glass surface changes as compared with the case where the above-mentioned “twist” is not added to the retainer.
[0009]
Thus, the attack angle is adjusted to an appropriate value by changing the contact angle of the blade rubber.
[0010]
[Patent Document 1]
Japanese Utility Model Publication No. 63-189858
[Patent Document 2]
Japanese translation of PCT publication No. 7-506065
[0011]
[Problems to be solved by the invention]
However, the technique disclosed in Patent Document 1 requires a special eccentric sleeve in order to incline the axial direction of the pivot shaft with respect to the surface of the vehicle body, which increases the number of parts. In addition, in order to obtain an appropriate attack angle, the machining accuracy of the eccentric sleeve must be set strictly, and there is a problem that the cost is high.
[0012]
On the other hand, the technique disclosed in Patent Document 2 does not require special parts unlike the technique disclosed in Patent Document 1. However, since the retainer exposed to the outside is “twisted” around an axis whose longitudinal direction is the longitudinal direction, there is a problem that the appearance quality of the wiper device is deteriorated.
[0013]
In view of the above facts, an object of the present invention is to obtain a wiper device and a wiper device attack angle setting method capable of setting the variation of the attack angle within an appropriate range without deteriorating the appearance quality.
[0014]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a wiper device comprising: a pivot shaft that is rotatably provided on the vehicle body outside a frame of a window glass attached to the vehicle body; an arm head that is attached to the pivot shaft; A wiper blade disposed in the longitudinal direction along the frame inside the frame of the window glass in a stopped state and a synthetic resin material, and is connected to the arm head at a base end portion And an arm member to which the wiper blade is coupled to a tip portion thereof, and further, the arm member is formed in a longitudinal direction along a rotational radial direction of the pivot shaft, and the wind glass or the surface of the vehicle body And a base portion coupled to the arm head so as to be rotatable in a direction of contact with and away from the first axis, and a longitudinal direction along the frame when the apparatus is stopped. An arm portion that rotatably supports the wiper blade at a tip portion around a second axis whose axial direction is the width direction of the wiper blade, and the device positioned between the arm portion and the base portion, A bending portion that is bent so as to be bent from the inside of the frame to the outside of the frame in a stopped state, and that inclines the longitudinal direction of the base portion with respect to the longitudinal direction of the arm portion, and includes the arm portion. The arm portion side including the bent portion is twisted with respect to the base side around a third axis whose axial direction is the longitudinal direction of the first, and the first axis and the second axis are three-dimensionally predetermined. It is characterized in that it is set to a positional relationship of torsion that is inclined at an angle.
[0015]
In the wiper device according to the first aspect of the present invention, when the pivot shaft rotates, the wiper blade connected to the pivot shaft via the arm head and the arm member rotates on the glass surface of the window glass. Thereby, the raindrop etc. which adhered to the glass surface of the wind glass are wiped off.
[0016]
On the other hand, in the wiper device according to the present invention, the arm member includes a base portion, a bent portion, and an arm portion. The base end portion of the base portion is coupled to the arm head so as to be rotatable around the first axis in a direction in which the arm member comes into contact with and separates from the window glass or the surface of the vehicle body. In addition, the wiper blade is rotatably connected to the distal end portion of the arm portion around a second axis whose axial direction is the width direction of the wiper blade.
[0017]
Here, the arm member bends from the inside to the outside of the frame with respect to the longitudinal direction of the arm portion along the window glass frame when the apparatus is stopped by the bending portion interposed between the arm portion and the base portion. It is bent as follows. Thereby, the longitudinal direction of the base part which continues to an arm part via a bending part inclines with respect to the longitudinal direction of an arm part. Moreover, the arm portion is twisted and deformed around the third axis whose axial direction is the longitudinal direction of the arm portion with respect to the base portion.
[0018]
From the above, the second axis is tilted to a predetermined angle three-dimensionally with respect to the first axis to set the torsional positional relationship (that is, two-dimensional on the arm side with respect to the base by the bent portion) A three-dimensional inclination obtained by adding an inclination around the third axis to a simple inclination).
[0019]
For this reason, in the wiper device according to the present invention, when the pivot shaft rotates and the wiper blade rotates on the glass surface of the wind glass, the arm member moves relative to the arm head in the first axis according to the rotation position. Rotate around. Furthermore, the inclination of the second axis with respect to the first axis changes as the arm member rotates about the first axis.
[0020]
As a result, the contact angle between the blade rubber of the wiper blade and the glass surface changes according to the rotational position of the wind glass on the glass surface. Moreover, this contact angle, that is, the so-called “attack angle”, which is the attitude angle of the blade rubber with respect to the normal of the glass surface at the contact portion between the glass surface of the wind glass and the blade rubber of the wiper blade, is an arm around the first axis. It changes depending on the range of the rotation angle of the member.
[0021]
Furthermore, this attack angle also changes depending on the twist angle (tilt angle) around the third axis of the arm part including the bent part. Therefore, in the wiper device according to the present invention, at the stop position (set position) of the wiper arm (arm member), the rotation posture (tilting angle) around the first axis of the arm member relative to the arm head and the third axis described above By setting both the surrounding torsion angles in advance, a desired (or appropriate) attack angle can be set within the range of the rotation angle of the wiper arm (arm member) over the entire wiping area of the wiper blade (or proper). (Appropriate) range.
[0022]
By the way, as already described, it is possible to adjust the attack angle by twisting the arm member or the wiper arm around its longitudinal direction. However, in order to greatly change the variation range of the attack angle by such adjustment, the arm member or the wiper arm must be largely twisted.
[0023]
On the other hand, in the wiper device according to the present invention, as described above, the rotation posture (tilting angle) of the arm member around the first axis with respect to the arm head at the wiper arm set position is adjusted. A variation range of the attack angle based on the twist angle around the three axes is added. For this reason, the attack angle which fluctuates over the entire wiping region by the wiper blade can be set within a desired range without increasing the twisting angle around the third axis. Thereby, the torsion as described above becomes inconspicuous, and the appearance quality can be maintained or improved.
[0024]
The wiper device according to a second aspect of the present invention is the wiper device according to the first aspect of the present invention, wherein the bent portion formed by bending is further twisted to form the second axis line in the first direction. It is characterized in that it is set in a positional relationship of torsion by inclining a predetermined angle three-dimensionally with respect to the axis.
[0025]
In the wiper device according to the second aspect of the present invention, the torsional position is set by twisting the bent portion and tilting the second axis three-dimensionally with respect to the first axis. ing. For this reason, since the bent portion is basically bent, the twist is not noticeable even if a twist is added. For this reason, deterioration of the appearance quality is effectively prevented.
[0026]
According to a third aspect of the present invention, in the wiper device according to the first or second aspect of the present invention, the arm member is configured such that the arm portion approaches the window glass with respect to the base portion. It is characterized by being inclined toward.
[0027]
In the wiper device according to the third aspect of the present invention, the arm portion is inclined with respect to the base portion so that the distal end side of the arm portion approaches the window glass with respect to the proximal end side of the arm portion. As described above, in the wiper device having the bent portion formed by bending, the arm member rotates about the first axis with respect to the arm head according to the rotation position of the wiper blade accompanying the rotation of the pivot shaft. To do.
[0028]
Here, as described above, the arm portion is inclined toward the direction of approaching the window glass with respect to the base portion, so that the inclination angle of the arm member rotates with respect to the arm head around the first axis at the set position. It is added to the posture (tilt angle). Therefore, the second axis is also inclined with the added inclination angle, and the amount of twist formation around the third axis can be reduced. Thereby, the attack angle which fluctuates over the entire wiping region by the wiper blade can be set within a desired range, and the appearance quality of the wiper arm can be further maintained or improved.
[0029]
According to a fourth aspect of the present invention, there is provided a method for setting an attack angle of a wiper device, wherein a pivot shaft is rotatably provided on the vehicle body outside a frame of a window glass attached to the vehicle body, and is attached to the pivot shaft. An arm head, a wiper blade that is disposed in a longitudinal direction along the frame inside the frame of the window glass when the apparatus is stopped, and a blade rubber that contacts the glass surface of the window glass; An arm portion that is longitudinally along the frame in the apparatus stopped state and that rotatably supports the wiper blade at a tip portion around a second axis whose axial direction is the width direction of the wiper blade; The window glass or the vehicle body is bent through a bent portion formed to be bent from the inside of the frame to the outside of the frame when the apparatus is stopped. It is continuous with the longitudinal base of the pivot shaft connected to the arm head so as to be rotatable about the first axis in the direction of contact with and away from the surface, and is integrally formed with a synthetic resin material. And a wiper device for setting an attack angle that is an attitude angle of the blade rubber with respect to a normal line of the glass surface at a contact portion of the blade rubber with the glass surface The attack angle setting method according to claim 1, wherein the arm member is caused to rotate around the first axis with respect to the arm head according to the rotation of the wiper blade on the glass surface as the pivot shaft rotates. A range of an inclination angle of the second axis with respect to the first axis, and a third axis along the longitudinal direction of the arm portion with respect to the base portion And Rino torsion angle, to set the variation of the attack angle within a predetermined range based on, is characterized in that.
[0030]
In the attack angle setting method for the wiper device according to the fourth aspect of the present invention, the attack angle is a change in the inclination angle of the second axis relative to the first axis caused by the rotation of the arm member around the first axis relative to the arm head. It is set based on the range and the twist angle around the third axis along the longitudinal direction of the arm portion.
[0031]
That is, the arm part which comprises the arm member integrally molded by the synthetic resin material is continuing to the base part via the bending part. However, although the longitudinal direction of the base portion is along the rotational radius direction of the pivot shaft, the bent portion is bent, so that the longitudinal direction of the arm portion is along the window glass frame when the apparatus is stopped.
[0032]
A configuration in which the longitudinal direction of each of the arm portion and the base portion which are continuous with each other via the bent portion formed by bending as described above is different (in other words, the longitudinal direction of the arm portion is inclined with respect to the longitudinal direction of the base portion). In the configuration, the arm member rotates about the first axis with respect to the arm head in accordance with a change in the rotation position of the wiper blade on the glass surface of the wind glass due to the rotation of the pivot shaft.
[0033]
Thus, when the arm member rotates about the first axis with respect to the arm head, the second axis that is the rotation axis of the wiper blade with respect to the arm member is inclined with respect to the first axis. As a result, the attack angle changes.
[0034]
On the other hand, even if torsion is added around the third axis along the longitudinal direction of the arm portion, the attack angle changes because the second axis is inclined.
[0035]
In the attack angle setting method according to the present invention, the range of the inclination angle of the second axis with respect to the first axis described above is intentionally set, and the twist angle around the third axis along the longitudinal direction of the arm portion. Is intentionally set, the variation of the attack angle is set in a desired range.
[0036]
For this reason, even if the twist angle around the third axis is small, it is possible to set the attack angle that varies over the entire wiping region by the wiper blade within a desired range. Thereby, the torsion as described above becomes inconspicuous, and the appearance quality can be maintained or improved.
[0037]
DETAILED DESCRIPTION OF THE INVENTION
<Configuration of the present embodiment>
FIG. 1 is a schematic exploded perspective view of a wiper device 10 according to an embodiment of the present invention, and FIG. 2 is an overall perspective view of the wiper device 10.
[0038]
As shown in these drawings, the wiper device 10 is a so-called wiper for wiping a rear glass 14 as a window glass provided on the back surface of a vehicle body 12 constituting a vehicle (for example, a rear hatch door of a hatchback type vehicle). It is applied as a rear wiper device. As shown in these drawings, the wiper device 10 includes an arm member 16 integrally formed of a synthetic resin material.
[0039]
As shown in FIGS. 3 to 5, the arm member 16 includes a pair of side wall portions 18 that face each other in the thickness direction. These side wall portions 18 are connected at one end in the width direction by the upper wall portion 20, and the overall cross-sectional shape of the arm member 16 is that a blade rubber 88 of a wiper blade 70 described later is disposed on the glass surface of the rear glass 14. In the pressed state, the cross-section has a concave shape opened toward the glass surface side of the rear glass 14.
[0040]
The base end side in the longitudinal direction of the arm member 16 having the side wall portion 18 and the upper wall portion 20 is a base portion 22. As shown in FIGS. 6 and 7, a substantially block-like connecting portion 24 is provided at the base end portion in the longitudinal direction of the base portion 22. The connecting portion 24 has a width dimension sufficiently smaller than that of the base portion 22 and is formed on the center side in the width direction of the base portion 22.
[0041]
Further, as shown in FIG. 7, a bearing portion 26 is formed in the connecting portion 24. The bearing portion 26 is a concave portion that opens toward the base end side in the longitudinal direction of the base portion 22, and the bottom portion thereof has a predetermined curvature around a first axis L <b> 1 with the width direction of the base portion 22 indicated by a one-dot chain line in FIG. The curved surface is curved in the above. Further, as shown in FIG. 7, an arm head 28 integrally formed of a synthetic resin material is provided on the side opposite to the base portion 22 of the connecting portion 24 corresponding to the bearing portion 26.
[0042]
The arm head 28 includes a support portion 30. As shown in FIG. 6, the support portion 30 has a pair of side wall portions 32 that face each other in the width direction (that is, the direction along the first axis L <b> 1). The interval between the side wall portions 32 is slightly larger than the width dimension of the connecting portion 24, and the connecting portion 24 enters between the side wall portions 32. Further, as shown in FIG. 7, a connecting shaft 34 is provided between the pair of side wall portions 32, which is the axial direction along the width direction of the base portion 22, that is, along the first axis L <b> 1 in FIG. 6. Yes.
[0043]
The connecting shaft 34 is fitted into the bearing portion 26, and pivotally supports the base portion 22 and, consequently, the arm member 16 so as to be rotatable about the first axis L1 in a direction in which the base member 22 contacts and separates from the glass surface of the rear glass 14. ing.
[0044]
Further, a locking pin 36 is formed on the support portion 30. One end of a tension coil spring 38 is locked to the locking pin 36. The main body portion of the tension coil spring 38 is disposed inside the base portion 22, and the other end is locked to a locking portion 40 formed inside the base portion 22. The arm member 16 is urged around the connecting shaft 34 (ie, around the first axis L1) by the urging force of the tension coil spring 38 in the direction of arrow F in FIG.
[0045]
On the other hand, the arm head 28 is provided with a mounting portion 42 adjacent to the support portion 30 and a head cover 44 formed of a synthetic resin material from the side opposite to the surface of the vehicle body 12. 44. The mounting portion 42 of the arm head 28 is formed in a bottomed cylindrical shape that opens toward the vehicle body 12 at a predetermined position outside the rear glass 14 (of the frame 15) of the vehicle body 12, and an upper bottom portion 46 thereof is formed. The arm head 28 is composed of a metallic bush inserted when the arm head 28 is integrally formed of a synthetic resin material.
[0046]
A pivot shaft 50 having a knurl formed on the outer peripheral portion of the tip passes through the upper bottom portion 46, and the mounting portion 42 and the pivot shaft 50 are integrally connected by a bolt 52 screwed to the tip portion. In the state where the mounting portion 42 is connected to the pivot shaft 50 in this way, as shown in FIG. 3, the distal end side of the base portion 22 connected to the arm head 28 extends from the outside of the frame 15 of the rear glass 14 toward the inside. ing.
[0047]
As shown in FIGS. 1 and 3, in the vehicle to which the wiper device 10 is applied for wiping the rear glass 14, the surface of the vehicle body 12 at the portion where the rear glass 14 is attached via the frame 15 is substantially the vehicle. Look backwards. Further, the axial direction of the pivot shaft 50 is inclined with respect to the direction of the surface of the vehicle body 12, and therefore the axial direction of the pivot shaft 50 is substantially inclined upward with respect to the rear of the vehicle. Yes.
[0048]
The pivot shaft 50 passes through a hole 54 formed in the vehicle body 12 on the base end side. As shown in FIGS. 1 and 2, the base end portion of the pivot shaft 50 is directly or directly on the drive shaft of the motor main body constituting the rear wiper motor 56 as drive means provided inside the vehicle body 12. It is indirectly connected via a driving force transmission means such as a speed reduction means and a link mechanism, and is configured to reciprocate around its own axis by receiving the driving force of the motor body of the rear wiper motor 56.
[0049]
On the other hand, as shown in FIGS. 3 to 5 and 8, the arm member 16 includes an arm portion 60. As shown in FIG. 3, the arm unit 60 is a stop position in the vicinity of the lower edge of the rear glass 14 on the glass surface of the rear glass 14 when the wiper device 10 is stopped (that is, the rear wiper motor 56 is stopped). It is located at (set position), and its longitudinal direction (the direction of arrow X in FIGS. 4, 5, and 8 and the direction along the third axis L <b> 3) is arranged along the frame 15.
[0050]
A bent portion 62 is formed between the arm portion 60 and the base portion 22. As shown in FIG. 8A, the bending portion 62 has a longitudinal direction on the arm portion 60 side (that is, a direction along the one-dot chain line L4 in FIG. 4) on the base portion 22 side (that is, a direction along the dashed line L4 in FIG. 4). A direction along the third axis L3 is bent by a predetermined angle θ1 around an axis whose axial direction is the thickness direction of the upper wall portion 20 (the arrow Z direction shown in FIG. 8B). As a result, the longitudinal direction of the arm portion 60 is inclined by a predetermined angle θ1 with respect to the longitudinal direction of the base portion 22.
[0051]
Also, as shown in FIGS. 9A and 9B, the bent portion 62 is twisted and deformed so as to rotate around the third axis L3. Therefore, the opening direction of the concave shape which is the cross-sectional shape of the arm member 16 is inclined by the predetermined angle θ2 on the arm portion 60 side of the bent portion 62 with respect to the base portion 22 side of the bent portion 62 (toward the operating direction at the stop position). Tilted).
[0052]
Further, as shown in FIG. 8B, the bent portion 62 is not only in the direction around the axis with the thickness direction of the upper wall portion 20 as the axial direction, but also in the opposite direction of the side wall portion 18 (that is, FIG. 4 and FIG. It is also bent in the direction around the axis with the direction indicated by the arrow Y in FIG.
[0053]
Therefore, the third axis L3 direction, which is the longitudinal direction of the arm portion 60, is an axis whose axial direction is the width direction of the arm member 16 with respect to the longitudinal direction of the base portion 22 (the direction along the one-dot chain line L4 in FIG. 8). It is inclined around the predetermined angle θ3. Thus, in a state where a lip portion 92 of a blade rubber 88 described later is in pressure contact with the glass surface of the rear glass 14, the distal end side is on the glass surface of the rear glass 14 with respect to the base end side (the bent portion 62 side) of the arm portion 60. Get close.
[0054]
A plurality of reinforcing ribs 64 are formed inside the arm portion 60, that is, between the one side wall portion 18 and the other side wall portion 18 in the arm portion 60, and the arm portion 60 formed of a synthetic resin material. That is, the mechanical strength of the arm member 16 is supplemented. In addition, a support portion 66 is formed at the distal end of the arm member 16 (the distal end portion of the arm portion 60).
[0055]
The support portion 66 has a width dimension that is smaller than the width dimension at the distal end side of the arm portion 60, and is formed on the substantially central side in the width direction at the distal end portion of the arm portion 60. A bearing portion 67 is formed on the support portion 66. The bearing portion 67 is a concave portion that opens toward the distal end side of the arm portion 60, and its bottom portion is a curved surface that is curved with a predetermined curvature around the second axis L <b> 2 along the width direction of the base portion 22.
[0056]
A wiper blade 70 is attached to the support portion 66. The wiper blade 70 includes a primary lever 72. The primary lever 72 includes a pair of side wall portions 74 that are elongated along the longitudinal direction of the arm portion 60.
[0057]
Each of these side wall portions 74 has a thickness direction along the width direction of the arm portion 60 (that is, the arrow Y direction in FIG. 4), and is opposed to each other along this thickness direction. These side wall parts 74 are connected by a bottom wall part 76. The bottom wall portion 76 is also formed in a narrow plate shape that is elongated along the longitudinal direction of the arm portion 60 (that is, the arrow X direction in FIG. 4). Along.
[0058]
A connecting shaft 68 having an axial direction substantially the same as the direction of the second axis L <b> 2 is provided between the side wall portions 74 in the substantially longitudinal center of the primary lever 72. The connecting shaft 68 is fitted in the bearing portion 67 and is pivotally supported by the bearing portion 67 so as to be rotatable around its own axis. As a result, the primary lever 72 and thus the wiper blade 70 are supported around the connecting shaft 68 (that is, around the second axis L2) so as to be rotatable by a predetermined angle.
[0059]
At both ends in the longitudinal direction of the primary lever 72, a substantially block-shaped support portion 78 is formed. From both ends in the width direction of the support portion 78 along the width direction of the primary lever 72, a connecting shaft 80 having an axial direction substantially the same as the direction of the second axis L2 is formed coaxially.
[0060]
A yoke lever 82 is attached to each of these support portions 78. The yoke lever 82 includes a pair of side wall portions 84 facing each other along the width direction of the primary lever 72. These side wall portions 74 are elongated along the longitudinal direction of the primary lever 72 and are longer in the longitudinal direction than the intermediate portion in the longitudinal direction of each yoke lever 82 (opposite to the other yoke lever 82 of one yoke lever 82). Are connected by an upper wall portion 86 formed on the side).
[0061]
The support portion 78 is inserted into the side of the upper wall portion 86 in the middle portion in the longitudinal direction of each yoke lever 82, and the connecting shaft 80 is inserted into a circular hole with a bottom (not shown) formed in the side wall portion 84. It has entered. Thus, the yoke lever 82 is supported so as to be rotatable by a predetermined angle around the connecting shaft 80 with respect to the primary lever 72.
[0062]
A blade rubber 88 is provided on the opposite side of each yoke lever 82 from the primary lever 72. The blade rubber 88 is formed of a rubber material or a synthetic resin material having physical properties including elasticity such as that of a rubber material. The blade rubber 88 is elongated along the longitudinal direction of the primary lever 72, and claw portions 90 in which predetermined portions on both ends in the longitudinal direction and in the middle in the longitudinal direction are formed at both ends in the longitudinal direction of each yoke lever 82. It is pinched by.
[0063]
The end of the blade rubber 88 opposite to the yoke lever 82 is a lip 92, and the urging force of the tension coil spring 38 described above is transmitted to the wiper blade 70 via the arm member 16, whereby the rear glass The lip portion 92 is pressed against the 14 glass surface.
[0064]
<Operation and effect of the present embodiment>
Next, the operation of the wiper device 10 will be described. In the wiper device 10, as described above, the longitudinal direction of the arm portion 60 is along the lower edge of the rear glass 14 when the rear wiper motor 56 is stopped. Therefore, the lip portion of the blade rubber 88 is near the lower edge of the rear glass 14. 92 is in pressure contact with the glass surface of the rear glass 14. When the motor body of the rear wiper motor 56 is driven in this stopped state and this driving force is transmitted to the pivot shaft 50, the pivot shaft 50 starts to rotate.
[0065]
When the pivot shaft 50 starts to rotate, the arm member 16 having the base portion 22 connected to the pivot shaft 50 via the arm head 28 starts to rotate toward the vehicle upper side of the vehicle body 12. By this rotation of the arm member 16, the lip portion 92 of the blade rubber 88 rotates on the glass surface toward the upper reverse position of the rear glass 14 while being pressed against the glass surface of the rear glass 14 by the urging force of the tension coil spring 38. To do.
[0066]
Further, when the blade rubber 88 rotates and the blade rubber 88 reaches the upper reversal position in the vicinity of the side edge of the one rear glass 14 substantially along the left-right direction of the vehicle, the pivot shaft 50 starts reversal rotation. As a result, the arm member 16 rotates in the direction opposite to that at the time of starting the rotation, that is, in the downward inversion position (corresponding to the stop position (set position) in the case of the present embodiment). To do.
[0067]
Further, when the blade rubber 88 reaches the stop position at the start of the rotation, the pivot shaft 50 rotates in the reverse direction again, and the arm member 16 rotates in the upward direction again. Thus, the pivot shaft 50 repeats reciprocating rotation, and the arm member 16 repeats reciprocating rotation, whereby the glass surface of the rear glass 14 is brought about by the lip portion 92 of the blade rubber 88 pressed against the glass surface of the rear glass 14. The water drops etc. on the top are wiped away.
[0068]
By the way, the tilting angle of the base 22 with respect to the arm head 28 around the first axis L1 (hereinafter, the tilting angle of the base 22 with respect to the arm head 28 around the first axis L1 is referred to as “the tilting angle of the base 22”). Basically, the biasing force of the tension coil spring 38 and the reaction force received by the blade rubber 88 from the glass surface of the rear glass 14 against the biasing force are balanced. Here, in the wiper device 10, the longitudinal direction of the arm portion 60 (the direction along the third axis L <b> 3) in the bent portion 62 is the longitudinal direction of the base portion 22 (the direction along the dashed line L <b> 4 in FIG. 8). It is inclined by a predetermined angle θ1.
[0069]
For this reason, the raising / lowering angle of the base portion 22 changes according to the rotation position of the blade rubber 88 (the rotation position of the blade rubber 88 on the glass surface of the rear glass 14) that changes as the pivot shaft 50 rotates. To do. Thus, when the tilting angle of the base portion 22 changes, the direction of the second axis L2 that is the axial direction of the connecting shaft 68 relative to the first axis L1 changes, and the lip portion 92 (blade rubber 88) with respect to the glass surface of the rear glass 14 changes. ) Contact angle changes.
[0070]
Therefore, according to the direction and curvature of the glass surface of the rear glass 14, for example, the amount of protrusion of the pivot shaft 50 from the vehicle body 12, that is, the height position of the arm head 28 from the surface of the vehicle body 12 is changed. By making the raising / lowering angle of the base portion 22 at a position a desired angle, the attack angle θA which is the attitude angle of the wiper blade 70 with respect to the normal LS at the portion where the blade rubber 88 is in contact with the glass surface of the rear glass 14 (that is, The angle θA) formed by the normal LS shown in FIG. 10 and the center line LA of the lip portion 92 of the blade rubber 88 can be set to an appropriate value.
[0071]
The appropriate value of the attack angle θA referred to here is, for example, a center line with respect to the normal LS shown in FIG. 10 at each position of the wiping area by the wiper blade 70 as shown in FIG. When the attack angle θA when the LA is tilted to the upper reverse position side is plus (+), and the attack angle θA when the LA is tilted to the lower reverse position (the set position in the present embodiment) is minus (−), The range is within ± 10 degrees.
[0072]
Further, in the wiper device 10, as shown in FIGS. 9A and 9B, in the bent portion 62, the arm portion 60 side is a predetermined angle θ2 around the third axis L3 with respect to the base portion 22 side. Only twisted and deformed. By being twisted and deformed in this manner, the second axis L2 is inclined around the third axis L3 with respect to the concave opening direction which is a cross-sectional shape on the base 22 side of the arm member 16.
[0073]
As a result, the inclination of the second axis L2 based on the rotation posture (tilting angle) of the arm member 16 around the first axis L1 with respect to the arm head 28 at the wiper arm set position, and the third in the longitudinal direction of the arm portion 60 are obtained. By adding the inclination of the second axis L2 based on the twist angle θ2 due to the twist formation around the axis L3, the attack angle θA that fluctuates over the entire wiping region by the wiper blade 70 is kept within a desired range. Can be set.
[0074]
Furthermore, as described above, the attack angle θA can be set based on the range of the rising and falling angles of the base portion 22. Here, in the wiper device 10, the arm portion 60 side of the bent portion 62 is inclined by the predetermined angle θ3 around the arrow Y direction in FIG. 8A (that is, the width direction of the arm member 16). Accordingly, the arm portion 60 is inclined so that the distal end side approaches the glass surface of the rear glass 14 with respect to the proximal end side thereof.
[0075]
In this manner, by tilting the arm portion 60 by the predetermined angle θ3 in advance, as a result, the rising angle of the base portion 22 is compensated by the predetermined angle θ3. Therefore, by tilting the arm portion 60 by the predetermined angle θ3 in advance as described above, the second axis L2 is further inclined and the amount of twisting around the third axis L3 is reduced. Can do. As a result, the attack angle θA that varies over the entire wiping area of the wiper blade 70 can be set within a desired range, and the appearance quality of the arm member 16 of the wiper arm can be maintained or improved.
[0076]
In addition, since the bent portion 62 is bent by the predetermined angle θ1, as described above, even if the bent portion 62 is twisted by the predetermined angle θ2, the twist is not noticeable. The appearance quality of the member 16 can be maintained or improved. As a result, the appearance quality of the wiper device 10 and further the vehicle to which the wiper device 10 is applied can be maintained or improved.
[0077]
As described above, in the wiper device 10, the arm member 16 extends from the outer side of the frame 15 of the rear glass 14 to the inner side, and the arm portion 60 of the arm member 16 is arranged to place the wiper blade 70 along the frame 15. 15 is bent at a predetermined angle θ1 by a bent portion 62 so as to be longitudinal along the line 15. In the wiper apparatus having such a configuration, the arm portion 60 side is twisted around the third axis L3 by a predetermined angle θ2, so that the first axis in addition to the inclination based on the inclination angle of the first axis L1. The second axis L2 is further inclined with respect to L1 (that is, set in a positional relationship of torsion inclined three-dimensionally by a predetermined angle).
[0078]
As a result, the attack angle θA that fluctuates over the entire wiping area by the wiper blade 70 can be set within a desired range, and without reducing the appearance quality of the wiper device 10 and thus the vehicle equipped with the wiper device 10. Good wiping performance can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic exploded perspective view showing an appearance of a vehicle to which a wiper device according to an embodiment of the present invention is applied.
FIG. 2 is a perspective view of a wiper device according to an embodiment of the present invention.
FIG. 3 is an enlarged perspective view of a main part showing a state where the wiper device according to the embodiment of the present invention is attached to a vehicle body.
FIG. 4 is a plan view of an arm head, an arm member, and a wiper blade, which are main parts of the wiper device according to the embodiment of the present invention.
FIG. 5 is a front view of an arm head, an arm member, and a wiper blade, which are main parts of the wiper device according to the embodiment of the present invention.
FIG. 6 is an enlarged plan view of an arm head and its vicinity.
FIG. 7 is an enlarged cross-sectional view of an arm head and its vicinity.
8A and 8B are views showing the appearance of an arm member, where FIG. 8A is a plan view of the arm member, FIG. 8B is a front view of the arm member, and FIG. 8C is a bottom view of the arm member.
9A and 9B are cross-sectional views of the bent portion of the arm member, where FIG. 9A is a cross-sectional view on the base portion side, and FIG. 9B is a cross-sectional view on the arm portion side.
FIG. 10 is a cross-sectional view of blade rubber and window glass for explaining an attack angle.
FIG. 11 is a graph showing an example of change in attack angle between a lower inversion position and an upper inversion position.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Wiper apparatus, 12 ... Car body, 14 ... Rear glass (window glass), 15 ... Frame, 16 ... Arm member, 22 ... Base, 28 ... Arm head, 50 ... Pivot shaft, 56 ... Rear wiper motor (drive means), 60 ... Arm part, 62 ... Bending part, 70 ... Wiper blade, 88 ... Blade rubber, L1 ... No. 1 axis, L2 ... 2nd axis, L3 ... 3rd axis, LS ... normal, θA ... attack angle

Claims (4)

A pivot shaft provided rotatably on the vehicle body outside the window glass frame attached to the vehicle body;
An arm head attached to the pivot shaft;
A wiper blade arranged in a longitudinal direction along the frame inside the frame of the window glass when the apparatus is stopped;
An arm member that is molded from a synthetic resin material and is connected to the arm head at the base end and the wiper blade is connected to the tip;
Further comprising the arm member,
A base portion which is a longitudinal direction along a rotational radius direction of the pivot shaft, and is coupled to the arm head so as to be rotatable in a direction in which the window glass or the surface of the vehicle body is in contact with or separated from the first axis.
An arm portion that is longitudinal along the frame when the apparatus is stopped, and that rotatably supports the wiper blade at a tip portion around a second axis whose axial direction is the width direction of the wiper blade;
It is located between the arm part and the base part, and is bent to be bent from the inside of the frame to the outside of the frame when the apparatus is stopped, and the longitudinal direction of the base part is inclined with respect to the longitudinal direction of the arm part. Bends,
The arm portion side including the bent portion is twisted with respect to the base side around a third axis whose axial direction is the longitudinal direction of the arm portion, and the first axis Set to the positional relationship of torsion in which the second axis was inclined three-dimensionally by a predetermined angle,
A wiper device characterized by that. By further twisting the bent portion formed by bending, the second axis is tilted three-dimensionally with respect to the first axis and set in a twisted positional relationship.
The wiper device according to claim 1. The arm member is
The arm portion is inclined toward the direction approaching the window glass with respect to the base portion,
The wiper device according to claim 1 or 2, wherein A pivot shaft provided rotatably on the vehicle body outside the window glass frame attached to the vehicle body;
An arm head attached to the pivot shaft;
A wiper blade that is disposed in a longitudinal direction along the frame inside the frame of the window glass when the apparatus is stopped, and a blade rubber is in contact with the glass surface of the window glass;
An arm portion that is longitudinally along the frame in the apparatus stopped state and that rotatably supports the wiper blade at a tip portion around a second axis whose axial direction is the width direction of the wiper blade; In a state where the apparatus is stopped, it can be rotated around a first axis in a direction to come into contact with and separate from the surface of the window glass or the vehicle body via a bent portion formed to bend from the inside of the frame to the outside of the frame. An arm member which is continuous with the longitudinal base portion along the rotational radius direction of the pivot shaft connected to the arm head, and is integrally formed of a synthetic resin material;
An attack angle setting method of the wiper device for setting an attack angle that is an attitude angle of the blade rubber with respect to a normal line of the glass surface at a contact portion of the blade rubber on the glass surface. There,
The second axis relative to the first axis generated by the rotation of the arm member around the first axis relative to the arm head according to the rotation of the wiper blade on the glass surface as the pivot shaft rotates. A range of tilt angles,
A twist angle about a third axis along the longitudinal direction of the arm portion with respect to the base portion;
Based on the above, the variation of the attack angle is set within a predetermined range,
An attack angle setting method for a wiper device.

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