JP3318267B2 - Wiper pivot and pivot drive mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A wiper device for wiping a windshield glass of an automobile has a pivot shaft to which a wiper arm and a blade are attached. The pivot shaft is rotatably supported by a pivot holder fixed to the vehicle body corresponding to the pivot hole of the cowl panel, and penetrates through the pivot hole to protrude from the inside of the vehicle body to the outside. A wiper arm is connected to the tip of the pivot shaft. The rotation of the pivot shaft causes the wiper arm and blade to reciprocate within a predetermined range, thereby wiping raindrops and the like on the windshield glass surface.

In such a wiper pivot of a wiper device, the pivot shaft is rotatably supported by a pivot holder, but a structure in which the pivot shaft is prevented from coming off in the axial direction by using a washer has been proposed. (For example, Japanese Utility Model Laid-Open No. 60-261).

In the wiper pivot of the wiper device disclosed in the above publication, a C-ring is fitted into a groove formed on the outer periphery of the pivot shaft while a metal washer is in contact with the end surface of the pivot holder, or a wave washer is fitted. Are fitted, and these washers are engaged with the end faces of the pivot holder to prevent the pivot shaft from coming off in the axial direction (the movement of the pivot shaft in the downward direction is restricted).

[0005] As described above, in general, the wiper pivot of the wiper device has the pivot holder fixed to the vehicle body, the pivot shaft protruding from the vehicle body surface, and the tip of the pivot shaft connected to the wiper blade. The wiper arm is fixed. Moreover, the pivot shaft is firmly prevented from coming off in the axial direction with respect to the pivot holder.

Here, if the wiper pivot (pivot shaft) protrudes greatly from the body surface,
At the time of a vehicle collision, the vehicle body is deformed, and with this deformation, the pivot shaft further protrudes, which may cause a protrusion obstacle. For example, it may come into contact with and damage the lower end of the windshield.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above facts, and provides a wiper pivot and a pivot drive mechanism that do not have a possibility of causing a projection failure due to member projection even if a vehicle is in a collision state. The purpose is to provide.

[0008]

According to a first aspect of the present invention, there is provided a wiper pivot which is rotatable about a pivot holder fixed to a vehicle body and a shaft hole of the pivot holder while projecting from a tip of the pivot holder. A pivot shaft that is supported, and a wiper arm whose base end is fixedly connected to the distal end of the pivot shaft, wherein the wiper pivot reciprocates the wiper arm by reciprocating rotation of the pivot shaft. attached to the outer peripheral, the with the pivot holder end surface abuts to restrict the axial movement of the pivot shaft with respect to the pivot holder, when the input load P exceeds the pivot shaft axis direction of the predetermined load bearing P ₁ is applied Break or deform the pivot shaft relative to the pivot holder; To release the axial movement regulation of the door, brittle
A stopper member having a thermoplastic resin as a base material as a base material, and a first load bearing member provided on an inner peripheral surface of a shaft hole of the pivot holder.
Press-fit with a holding force P ₂ smaller than the weight P ₁
Axial movement of the pivot shaft by the stopper member
When the movement restriction is released, the pin of the stopper member is released.
Pressed by broken or deformed parts on the bot shaft side
Support that moves in the axial direction with the pivot shaft
When the restriction on the axial movement of the pivot shaft by the stopper member is released, the axial movement of the pivot shaft that moves in the axial direction along the axial hole of the pivot holder is predetermined. A movement buffering means for permitting only a stroke and buffering the moving force during the stroke.

[0009] In the pivot of claim 1, wherein the wiper, the stopper member has a predetermined load capacity P _1. Applied input load P in the axial direction of the pivot shaft, when exceeding the withstand load P ₁ of the stopper member, the stopper member is axially moved regulation is released for the pivot holder of the pivot shaft to break or deform. After the axial movement restriction on the pivot holder of the pivot shaft is released,
Breakage or deformation of the stopper member on the pivot shaft side
The part presses the support member of the movement buffer means, and the pivot shaft moves axially into the pivot holder together with the support member and is pushed. Moreover, axial movement of the pivot shaft and the support member, while being tolerated by the predetermined stroke by the movement damping means, while the pivot shaft and the support member moves, pivots
Press-fixed supported by the holding force P ₂ in the axial bore peripheral surface of the holder
Friction between the port member and the inner peripheral surface of the pivot hole of the pivot holder
The energy is consumed by rubbing, and the pivot shuff
The moving force of the vehicle is buffered.

Here, in the conventional wiper pivot, an axial movement restricting structure is adopted in which the pivot shaft and the pivot holder cannot be easily separated and disassembled even when a large force is applied in the axial direction of the pivot shaft. However, in the first place, the axial load in the normal rotation operation of the pivot shaft is relatively smaller than the radial load of the shaft. Therefore, the withstand load of the stopper member as described above can be set to a relatively small value.

Thus, in normal operation, the pivot shaft is rotatably supported and operates without hindrance, and when a load is applied from a limited range of axial direction, a relatively small amount of force acts on the pivot shaft. The stopper member is broken or deformed by the force, so that the axial movement restriction of the pivot shaft with respect to the pivot holder is released, and the protruding portion of the pivot shaft is axially moved into the pivot holder and pushed.

As described above, when the vehicle body is deformed due to, for example, a vehicle collision and a load exceeding a predetermined withstand load is applied to the pivot shaft, the pivot shaft is retracted into the pivot holder, and at this time, the collision is caused by the movement buffer means. The shock at the time is buffered, so that damage to surrounding vehicle structural materials and the like can be prevented. In addition, the movement of the pivot shaft lowers the overall posture of the wiper pivot and the posture of the base end of the wiper arm, and there is no possibility that a protrusion failure due to member protrusion occurs.

The pivot of the wiper according to the second aspect of the present invention is the pivot of the wiper according to the first aspect .
Topper material is made of polyphenylene sulfide
Characterized in that it is a resin washer .

In the pivot of the wiper according to the second aspect ,
Topper member made of polyphenylene sulfide
By using a resin washer, thermoplastic brittle fracture material
Among the most aggressive resins, they have excellent wear resistance and low temperature dependency.
In a more stable first set of load-bearing P ₁ has a stopper member
Can be specified.

According to a third aspect of the present invention, there is provided the pivot of the wiper according to the first or second aspect, wherein the wiper arm is fixed to the tip of the pivot shaft together with the pivot shaft. It is characterized by moving in the axial direction.

In the pivot of the wiper according to the third aspect, when the restriction of the axial movement of the pivot shaft by the stopper member is released, the pivot shaft is axially moved and pushed into the pivot holder. The wiper arm moves in the axial direction together with the pivot shaft while being fixed to the tip of the pivot shaft to lower its posture. That is, the pivot shaft and the wiper arm are moved while being connected and fixed to each other. Therefore, the pivot shaft does not fall out of the pivot holder completely, and since the wiper arm and the pivot shaft do not separate, they do not scatter.

According to a fourth aspect of the present invention, in the pivot of the wiper according to the third aspect of the present invention, the wiper arm has a cylindrical skirt surrounding the pivot shaft, and the pivot holder includes the pivot holder. At the time of the axial movement along the axial hole of the pivot shaft, the pivot shaft has a boss portion smaller in diameter than the skirt portion accommodated in the skirt portion at the predetermined stroke end.

In the pivot of the wiper according to the fourth aspect, since the wiper arm has the skirt surrounding the pivot shaft, waterproofness and appearance are improved. On the other hand, since the pivot holder has the boss portion, when the pivot shaft moves in the axial direction together with the wiper arm, the boss portion of the pivot holder is accommodated in the skirt portion of the wiper arm at a predetermined stroke end. Therefore, since the skirt does not collide with the boss, the movement of the predetermined stroke is not hindered by the boss, and as a result, a sufficient movement stroke of the pivot shaft and the wiper arm can be obtained.

According to a fifth aspect of the present invention, in the pivot of the wiper according to the third or fourth aspect, the wiper arm has a cylindrical skirt surrounding the pivot shaft. The portion is characterized in that a cut is formed around the entire circumference or at an interval.

In the wiper pivot according to the fifth aspect, the wiper arm has a cut formed in the skirt portion surrounding the pivot shaft, and the cut formed portion is a weak portion (weak point portion). Therefore, when the pivot shaft moves in the axial direction together with the wiper arm, the skirt portion of the wiper arm collides with the boss portion of the pivot holder at a predetermined stroke end, thereby damaging and deforming the cut forming portion (fragile portion), thereby reducing the movement stroke. An extra space can be secured, and as a result, a sufficient movement stroke of the pivot shaft and the wiper arm can be obtained.

According to a sixth aspect of the present invention, there is provided a pivot drive mechanism for rotatably driving the pivot shaft of the wiper pivot according to any one of the first to fifth aspects, wherein the pivot drive mechanism comprises: A rotating lever having one end fixed to the base end of the shaft, a link rod connecting the other end of the rotating lever to a driving source fixed to the vehicle body,
The provided, the other end of the pivot lever is connected to one end of rollingly the link rod by ball joints, it is characterized by.

According to a sixth aspect of the present invention, there is provided a pivot drive mechanism for rotating a pivot shaft of a pivot of a wiper according to any one of the first to fifth aspects, wherein the pivot drive mechanism is integrated with the pivot shaft. The pivot shaft is rotated by connecting the fixed rotation lever to a link rod that is reciprocally driven by a drive source fixed to the vehicle body.

Here, since the link rod is directly or indirectly connected to a drive source fixed to the vehicle body, even if a load is applied in the axial direction of the pivot shaft and the pivot shaft attempts to move with respect to the pivot holder, If the pivot shaft is connected to the link rod (that is, the vehicle body fixed side) via the rotating lever, the reaction force of the load acts on the pivot shaft, and the axial movement restriction of the pivot shaft may not be released. There is.

In this respect, in the pivot drive mechanism according to the sixth aspect, since the link rod and the rotation lever are connected by a rotatable ball joint, the rotation lever and the link rod can be connected in any direction. The pivot shaft can be tilted, and the pivot shaft moves in the axial direction due to the load, so that one end of the rotating lever can also move. Thus, the pivot shaft can be smoothly moved with respect to the pivot holder without receiving a reaction force from the link rod side in accordance with the axial movement of the pivot shaft and without obstructing the axial movement of the pivot shaft.

[0025]

FIG. 1 is a sectional view showing the structure of a wiper pivot 10 according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a configuration of a main part of the wiper pivot 10. As shown in FIG.

The wiper pivot 10 is a pivot holder 1
2 is provided. The pivot holder 12 is formed in a substantially cylindrical shape as a whole by, for example, die-casting an aluminum alloy, and a flange portion 14 is integrally formed at an axially intermediate portion. This flange portion 14
Is provided with a mounting hole 16, and the pivot holder 12 is fixed to the vehicle body by a mounting bolt inserted into the mounting hole 16.

A pivot shaft 22 is inserted into the pivot holder 12, and is rotatably supported via a support 24 and a support 26 as movement buffering means. The supports 24 and 26 are formed in a cylindrical shape, and one end of the support 24 is separated from (enters into) the tip end surface of the boss portion 12A at the tip of the pivot holder 12, and is located in the shaft hole of the pivot holder 12. It is press-fitted in the holding power P ₂ in circumference. The support 24 controls the axial movement of the pivot shaft 22 that moves axially along the shaft hole of the pivot holder 12 when the axial movement restriction of the pivot shaft 22 by the washer 28 as a stopper member described later is released. A predetermined stroke is allowed, and the moving force is buffered during that time.

The pivot shaft 22, which is rotatably supported by the supports 24 and 26, penetrates a pivot hole (not shown) of the cowl panel and projects from the inside to the outside.

An axially intermediate portion of the pivot shaft 22,
That is, a washer 28 and a washer 30 as stopper members are provided at the distal end of the pivot holder 12. One washer 28 is separated from the support 24 and is further provided so as to protrude from the outer peripheral edge of the pivot holder 12. Further, the other washer 30 is prevented from moving toward the distal end side of the pivot shaft 22 by a snap ring 32 attached to an intermediate portion in the axial direction of the pivot shaft 22. As a result, the washer 28 as a stopper member comes into contact with the distal end surface of the pivot holder 12 and the pivot shaft 2 with respect to the pivot holder 12.
2 restricts downward movement in the axial direction (movement in the direction of coming out of the pivot holder 12 downward).

Here, the washer 28 is provided with a predetermined withstand load P ₁ (for example, 980 N〜) which can be regulated until the load P acting in the axial direction of the pivot shaft 22 reaches a predetermined value.
3920N) has, when the input load P exceeds the withstand load P _1, is configured to release the axial movement regulation of the pivot shaft 22 with respect to the pivot holder 12 washer 28 is broken or deformed ing. Furthermore, the load-bearing P ₁ of the washer 28 is set to be greater than the holding force P ₂ of the support 24 described above (e.g., 490 N).

Further, the washer 28 has a disk shape, is excellent in abrasion resistance, has low temperature dependency, is low in strength, and is a thermoplastic resin which is a brittle fracture material, for example, a resin whose base material is polyphenylene sulfide. Washer.

A cap 34 is attached to the tip of the pivot holder 12 (the upper outer periphery of the pivot shaft 22 projecting upward from the pivot holder 12). The cap 34 is formed in a substantially cylindrical shape, and its rear end portion is fixed to the outer periphery of the distal end portion of the pivot holder 12 and is locked by the outer peripheral protruding edge portion 28A of the washer 28 described above to prevent it from falling off. . A seal portion 36 is formed on the inner periphery of the tip of the cap 34, and the seal portion 36 is slidably adhered to the outer periphery of the pivot shaft 22. Thereby, the cap 34 is attached to the pivot holder 12.
The distal end portion is covered to waterproof the space between the pivot shaft 22 and the pivot holder 12.

The base end of the wiper arm 42 is attached and fixed to the distal end of the pivot shaft 22 of the wiper pivot 10 having the above-described structure by a nut 44. At the base end of the wiper arm 42, a cylindrical skirt 43 surrounding the pivot shaft 22 is formed. When the washer 28 is broken or deformed as described above and the axial movement restriction of the pivot shaft 22 with respect to the pivot holder 12 is released as described above, the wiper arm 42 remains fixed to the tip of the pivot shaft 22. It moves axially with the shaft 22. Further, when the pivot shaft 22 moves in the axial direction, the pivot holder 1 is inserted into the skirt portion 43 at a predetermined stroke end.
The second boss 12A is configured to be accommodated therein.

A link arm 46 is attached to the lower end of the pivot shaft 22, and is connected to a wiper drive mechanism (not shown). Pivot shaft 22
The wiper arm 42 is reciprocated in a predetermined range by the rotation of. Further, by fixing the link arm 46 to the pivot shaft 22, the link arm 4
6 restricts the pivot shaft 22 from moving toward the distal end side by contacting the rear end surface of the pivot holder 12, and restricts the pivot shaft 22 from moving in both axial directions with the washer 28 as the stopper member. Have been.

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

In the wiper pivot 10 having the above-described structure, the rotation of the pivot shaft 22 rotatably supported by the pivot holder 12 causes the wiper arm 42 (wiper arm & blade) to reciprocate within a predetermined range, thereby rotating the windshield glass surface. Wipe off raindrops, etc.

[0037] Here, in the wiper pivot 10, the washer 28 has a predetermined load capacity P _1. A load P is applied in the axial direction of the pivot shaft 22, and the washer 28
When exceeding the load bearing P _1, the washer 28 (stress rupture portion 40) is axial movement regulation is released for the pivot holder 12 of the pivot shaft 22 to break or deform. After the restriction on the movement of the pivot shaft 22 in the axial direction is released, the pivot shaft 22 is axially moved into the pivot holder 12 together with the support 24 and pushed.
Further, the axial movement of the pivot shaft 22 is permitted by a predetermined stroke by the support 24, and the movement force of the pivot shaft 22 during this time is buffered.

In this case, the conventional wiper pivot has an axial movement restricting structure in which even if a large force is applied in the axial direction of the pivot shaft 22, the pivot shaft 22 and the pivot holder 12 cannot be easily separated and disassembled. However, the axial load in the normal rotation operation of the pivot shaft 22 is relatively smaller than the radial load of the shaft in the first place. Therefore, load capacity P ₁ of the aforementioned such washer 28 can be set relatively small value.

Thus, in normal operation, the pivot shaft 22 is rotatably supported and operates without any trouble, and acts on the pivot shaft 22 when a load P from a limited range of the axial direction is applied. The washer 28 is broken or deformed by a relatively small force, and the axial movement restriction of the pivot shaft 22 with respect to the pivot holder 12 is released. As shown in FIGS.
2 are pushed into the pivot holder 12 by moving in the axial direction. In FIG. 3, the cap 34 is omitted.

[0040] Thus, for example, the pivot shaft 22 to deform the body in such a vehicle collision at a given load bearing P when _one load P exceeding acting (pivot shaft 22 axial direction component force of the load acting load P The pivot shaft 22 is retracted into the pivot holder 12, and this movement cushions the impact at the time of collision, that is, the outer periphery of the support 24 when the pivot shaft 22 and the support 24 are retracted into the pivot holder 12 together. Energy is consumed due to friction between the shaft and the inner periphery of the pivot holder 12, so that the energy is buffered, so that damage to surrounding vehicle structural materials and the like can be prevented. In addition, the movement of the pivot shaft 22 also lowers the overall posture of the wiper pivot 10 and the posture of the base end of the wiper arm 42, and there is no possibility that a protrusion failure due to member protrusion occurs.

In the wiper pivot 10, when the axial movement restriction of the pivot shaft 22 by the washer 28 is released, the pivot shaft 22 is axially moved and pushed into the pivot holder 12, but in this case, The wiper arm 42 moves in the axial direction together with the pivot shaft 22 while being fixed to the end of the pivot shaft 22 to lower its posture. That is, the pivot shaft 22 and the wiper arm 42 are moved while being connected and fixed to each other.

Therefore, the pivot shaft 22 does not fall out of the pivot holder 12 completely.
Since the wiper arm 42 and the pivot shaft 22 do not separate, they do not scatter.

Furthermore, in the wiper pivot 10, the wiper arm 42 has the skirt 43 surrounding the pivot shaft 22, so that the waterproofness and appearance are improved. Further, since the pivot holder 12 has the boss 12A, when the pivot shaft 22 moves in the axial direction together with the wiper arm 42, the boss 12A of the pivot holder 12 is inserted into the skirt 43 of the wiper arm 42 at a predetermined stroke end. Is accommodated. Therefore, the skirt portion 43 does not collide with the boss portion 12A, and the movement stroke L corresponding to the length of the boss portion 12A does not occur.
Can be secured, and as a result, a sufficient moving stroke H of the pivot shaft 22 and the wiper arm 42 can be obtained.
Can be obtained.

Incidentally, in the first embodiment,
Washer 28 is simply using the disc-shaped resin washer, when the load P exceeds the predetermined load-bearing P ₁ is exerted on the pivot shaft 22 axially, broken by concentrating the stress in place stress A broken portion may be provided, and its shape may be manipulated to adjust the degree of concentration of stress.

For example, as shown in FIGS. 5A and 5B, by forming four holes 38, a ring-shaped stress rupture portion 40 may be set between the holes 38. In this case, when the input load P exceeding a predetermined load bearing P ₁ is applied, the stress in the stress rupture portion 40 ruptures or deforms concentrated. Thus, while ensuring the thickness of the washer 28 in consideration of wear or the like, or without being fixed to the material, the predetermined load-bearing P ₁ can be acceleration setting. The number of the holes 38 is not limited to four, and may be another number.

In the first embodiment,
A cylindrical skirt portion 43 surrounding the pivot shaft 22 is formed at the base end of the wiper arm 42. When the pivot shaft 22 moves in the axial direction, the boss portion of the pivot holder 12 is inserted into the skirt portion 43 at a predetermined stroke end. Although 12A is accommodated, the cutout 52 may be formed in the skirt portion 50, for example, as in a wiper arm 48 shown in FIG.

According to the wiper arm 48, the cut portion 52 formed in the skirt portion 50 is a weak portion (weak point portion). Therefore, when the pivot shaft 22 moves in the axial direction together with the wiper arm 48, the skirt portion 50 of the wiper arm 48 collides with the boss portion 12A of the pivot holder 12 at a predetermined stroke end, so that the cut forming portion (fragile portion) is damaged and deformed. Will do. Therefore, an extra moving stroke of the pivot shaft 22 and the wiper arm 48 can be secured, and as a result, a sufficient moving stroke of the pivot shaft 22 and the wiper arm 48 can be obtained.

Further, the wiper arm 48 shown in FIG.
The skirt portion 50 has a configuration in which four cuts 52 are formed. However, the formation portions (number) of the cuts 52 are not limited to this, and the skirt portion 50 is formed around the entire circumference or at intervals. do it.

Next, FIG. 7 is a perspective view showing the overall structure of a pivot drive mechanism 70 according to a second embodiment of the present invention.

The pivot drive mechanism 70 is configured by applying one set of the wiper pivot 10 described in the above embodiment. A pivot lever 72 is attached to the lower end (base end) of the pivot shaft 22 of one wiper pivot 10, and a pivot lever 74 is attached to the lower end (base end) of the pivot shaft 22 of the other wiper pivot 10. Is attached. Each rotating lever 72
And the rotating lever 74 are connected by a link rod 76.
6 is connected to the wiper motor 80 by a link rod 78. The wiper motor 80 is fixed to the vehicle body.

Here, the rotating lever 72 and the link rod 7
6 and a connecting portion between the rotating lever 74 (one end of the link rod 76) and the link rod 78 are rotatably connected by ball joints (ball joints) 82, respectively.

The pivot drive mechanism 70 having the above-described structure is a drive mechanism for rotating and driving the pivot shaft 22 of the wiper pivot 10 described in the above embodiment, and the pivot lever 7 is integrally fixed to the pivot shaft 22.
2, 74 are connected to link rods 76, 78 reciprocally driven by a wiper motor 80 fixed to the vehicle body, thereby rotating the pivot shaft 22.

Here, since the link rods 76 and 78 are directly or indirectly connected to the wiper motor 80 fixed to the vehicle body, a load P is applied in the axial direction of the pivot shaft 22 and the pivot shaft 22 is connected to the pivot holder 12.
, The pivot shaft 22 is connected to the link rods 76, 78 via the pivot levers 72, 74.
(That is, the vehicle body fixed side)
The reaction force of the load P acts on the pivot shaft 22, and there is a possibility that the axial movement restriction of the pivot shaft 22 is not released.

In this regard, in the pivot drive mechanism 70 according to the present embodiment, since the link rods 76, 78 and the rotary levers 72, 74 are connected by the freely rotatable ball joint 82, the pivot drive mechanism 70 in any direction. The pivot levers 72 and 74 and the link rods 76 and 78 can be tilted, and the pivot shaft 22 moves in the axial direction due to the load P, so that one end side of the pivot levers 72 and 74 can also move. Thus, with the axial movement of the pivot shaft 22, the link rod 7
The pivot shaft 22 can be smoothly moved with respect to the pivot holder 12 without receiving a large reaction force from the sides 6 and 78 and without obstructing the axial movement of the pivot shaft 22.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a wiper pivot according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a configuration of a main part of the wiper pivot according to the first embodiment of the present invention.

FIG. 3 is a longitudinal sectional view corresponding to FIG. 1 and showing a state in which a pivot shaft of the wiper pivot according to the first embodiment of the present invention is axially moved relative to the pivot holder without a cap;

FIG. 4 is a longitudinal sectional view corresponding to FIG. 2 in a state where the pivot shaft of the wiper pivot according to the first embodiment of the present invention has moved relative to the pivot holder in the axial direction.

5A and 5B show another example of the wiper pivot washer according to the first embodiment of the present invention, and FIG.
(B) is a sectional view.

FIG. 6 is a perspective view showing another example of the wiper arm of the wiper pivot according to the first embodiment of the present invention.

FIG. 7 is a perspective view showing an overall configuration of a pivot drive mechanism according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Wiper pivot 12 Pivot holder 12A Boss part 22 Pivot shaft 24 Support (support member) 28 Washer (stopper member) 42 Wiper arm 43 Skirt part 70 Pivot drive mechanism 82 Ball joint

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Watanabe 390 Umeda, Kosai-shi, Shizuoka Prefecture Asmo Co., Ltd. (72) Inventor Mamoru Kagawa 1-4-1 Chuo, Wako-shi, Saitama Pref. 56) References JP-A-2000-62577 (JP, A) JP-A-62-156073 (JP, U) JP-A-1-175954 (JP, U) JP-A-60-261 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) B60S 1/04-1/60

Claims (6)

(57) [Claims] 1. A pivot holder fixed to a vehicle body, a pivot shaft rotatably supported by a shaft hole of the pivot holder so as to protrude from a distal end of the pivot holder, and a base end portion of the pivot shaft being a distal end of the pivot shaft. And a wiper arm connected and fixed to the wiper arm, wherein the wiper arm reciprocates and rotates the wiper arm by reciprocating rotation of the pivot shaft. The wiper arm is attached to an outer periphery of the pivot shaft and abuts on an end surface of the pivot holder to hold the pivot holder. Along with restricting the axial movement of the pivot shaft with respect to
Exceeds a predetermined load bearing P ₁ on the pivot shaft axis
When an input load P is applied, the pivot shaft is broken or deformed to release the axial movement regulation of the pivot shaft with respect to the pivot holder , and a thermoplastic resin as a brittle fracture material is used as a base material.
And the first withstand load P on the inner peripheral surface of the shaft hole of the pivot holder.
Press-fitted with a small holding force P ₂ than _1, and the scan
An axial movement rule of the pivot shaft by a topper member
When the control is released, the pivot of the stopper member is released.
Is pressed by the broken or deformed part on the shaft side.
A support that moves axially with the pivot shaft
The axial movement of the pivot shaft, which moves axially along the axial hole of the pivot holder when the restriction of the axial movement of the pivot shaft by the stopper member is released by the stopper member, is moved by a predetermined stroke. A pivoting means for the wiper, comprising: a movement buffer means for permitting and buffering the moving force during the movement. The stopper member is made of polyphenylene
The pivot for a wiper according to claim 1, wherein the wiper is a resin washer whose base material is lufide . 3. The wiper arm moves in the axial direction together with the pivot shaft while being fixed to a tip of the pivot shaft.
Or the pivot of the wiper according to claim 2. 4. The wiper arm has a cylindrical skirt surrounding the pivot shaft, and the pivot holder moves at the predetermined stroke end when the pivot holder moves in an axial direction along an axial hole of the pivot shaft. From the skirt portion contained in the skirt portion
The pivot for a wiper according to claim 3, further comprising a small-diameter boss portion. 5. The wiper arm has a cylindrical skirt surrounding the pivot shaft, and the skirt is formed with a notch around the entire circumference or at intervals. The pivot of the wiper according to claim 3 or 4, wherein the wiper pivots. 6. A pivot drive mechanism for rotating the pivot shaft of the wiper according pivot to any one of claims 1 to 5, one end of the base end of the pivot shaft is fixed A rotating lever, and a link rod connecting the other end of the rotating lever to a drive source fixed to the vehicle body, the other end of the rotating lever being rotatably rolled by a ball joint. is connected to one end, a pivot driving mechanism, characterized in that.