JPH07228222A - Vehicular wiper - Google Patents

Abstract

PURPOSE:To provide a vehicular wiper by which a chattering phenomenon of a wiper arm and a blade can be reduced and a specific wiping-out range can be maintained by reducing an overrun and this can be inexpensively realized with an extremely simple structure. CONSTITUTION:An arm head 16 of a wiper is installed on a pivot shaft 14 through an elastic rubber bush 24. A cover 32 is fixed to the pivot shaft 14, and a pair of rubber stoppers 42 are installed on the cover 32 so as to be opposed to the arm head 16. When the arm head 16 reaches a reciprocating turning limit (a specific maximum elastic deformational condition of the elastic rubber bush 24), the rubber stoppers 42 engage with the arm head 16, and turning not less than that is checked, and a specific wiping-out range of the wiper is maintained. Thereby, an overrun is reduced regardless of traveling speed or the like of a vehicle, and the structure is simplified, and the cost is reduced.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In a vehicle wiper for wiping a windshield glass of an automobile, a wiper blade (blade rubber) moves in close contact with the windshield glass surface to wipe away raindrops and the like. The relative frictional characteristics between the windshield glass surface and the blade rubber during operation of the wiper have a negative gradient due to the oil film adhering to the wiper arm and blade self-excited vibration (so-called chatter phenomenon) may occur. there were.
When such a chattering phenomenon occurs, it not only results in poor wiping, but also causes abnormal wear of the blade rubber, reduced durability of the wiper drive link, and increased power consumption of the wiper motor. Was there. Moreover, such a chattering phenomenon is extremely annoying and annoying.

In this case, it is conceivable to simply increase the rigidity of the wiper arm to prevent the chatter phenomenon from occurring.
Since the wiper arm becomes heavy, problems such as reduced durability of the link part and increased reversing sound of the wiper blade occur,
It cannot be a fundamental measure.

In order to solve the above problems, there has been proposed a wiper having a structure in which a rubber bush is provided on the pivot shaft and the arm head of the wiper arm is attached to the pivot shaft via the rubber bush.

According to this wiper, the arm head (wiper arm) can relatively rotate with respect to the pivot shaft due to the elastic deformation of the rubber bush. Therefore, even if self-excited vibration of the wiper arm and blade is about to occur, this vibration occurs. (Input from the wiper arm and blade) is absorbed by the rubber bush, and as a result, the chattering phenomenon is reduced, and defective wiping, abnormal wear of the blade rubber, and deterioration of durability of the wiper driving link portion are prevented.

In a vehicle wiper, the wiper arm and blade are wiped in a predetermined wiping range during high-speed operation of the wiper and high-speed running of the vehicle due to backlash of the wiper operating mechanism (link) and inertial force of the wiper arm and blade. There was a case where a so-called overrun phenomenon of reversing beyond the (reciprocating rotation limit) occurred. In this case, in particular, in the wiper having a structure in which the arm head (wiper arm) is attached to the pivot shaft via the rubber bush as described above, the inertia force of the wiper arm and blade rather acts to promote the overrun phenomenon. It is necessary to take measures to reduce the overrun phenomenon.

In this case, in order to solve the above-mentioned problems,
Setting the swing angle of the wiper drive link by anticipating the maximum overrun amount of the wiper arm and blade,
Countermeasures such as switching the link swing angle according to the wiper operating speed and the vehicle running speed (variable type) are conceivable, but in any case, the mechanism itself is complicated and large and costly. It is not a fundamental solution.

[0008]

In consideration of the above facts, the present invention can reduce the chatter phenomenon of the wiper arm and blade, and further reduce the overrun of the wiper arm and blade regardless of the wiper operating speed and the traveling speed of the vehicle. You can
Moreover, it is an object to obtain a vehicle wiper that can realize this with a very simple structure and at low cost.

[0009]

In a vehicle wiper according to a first aspect of the present invention, an arm head of a wiper arm is attached to a pivot shaft via an elastic bush, and the wiper arm is rotated within a predetermined range by rotation of the pivot shaft. In a vehicle wiper which reciprocally rotates and the arm head can be displaced relative to the pivot shaft by elastic deformation of the elastic bush, the arm head is moved by a predetermined amount with respect to the pivot shaft by elastic deformation of the elastic bush. It is characterized in that a limiting means is provided for limiting relative displacement of the arm head with respect to the pivot shaft when the displacement occurs.

A vehicle wiper according to a second aspect of the present invention is the vehicle wiper according to the first aspect, wherein the limiting means is
A cover that is connected to the pivot shaft and covers the pivot shaft and the elastic bush from above, and when the arm head is rotated relative to the pivot shaft by a predetermined angle due to elastic deformation of the elastic bush provided on the cover. And a stopper that abuts on the arm head and limits rotation of the wiper arm.

In the vehicle wiper according to the third aspect of the invention, the arm head of the wiper arm is attached to the pivot shaft via the elastic bush, and the pivot of the pivot shaft causes the wiper arm to reciprocally rotate within a predetermined range and at the same time. In a vehicle wiper in which the arm head can be relatively displaced with respect to the pivot shaft by elastic deformation of an elastic bush, the arm head is integrally provided with the pivot shaft and always rotates together with the pivot shaft and is separated from the pivot shaft. A stopper pin that is rotatably engaged with the arm head at a position, and the elastic bush is elastically deformed about the stopper pin so that the arm head is displaced relative to the pivot shaft. It has a feature.

[0012]

In the vehicle wiper according to the first aspect, the wiper arm reciprocally rotates by the rotation of the pivot shaft to wipe off raindrops and the like.

Here, even if self-excited vibration of the wiper arm & blade is about to occur or a load is applied, this vibration and load fluctuation (input from the wiper arm & blade to the pivot shaft) are absorbed by the elastic bushing, resulting in Chattering phenomenon is prevented. For this reason, defective wiping, abnormal wear of the blade rubber, and deterioration of durability of the link portion for driving the wiper are prevented.

Further, here, even if the inertial force of the wiper arm and blade acts so as to largely elastically deform the elastic bush when the wiper arm reaches the limit of reciprocal rotation, the relative displacement of the arm head is limited by the limiting means. As a result, the further rotation of the wiper arm is restricted, and the predetermined wiping range is maintained. Therefore, the overrun phenomenon in which the wiper arm and blade are reversed beyond the predetermined wiping range is reduced.

As described above, not only the chattering phenomenon of the wiper arm and blade can be reduced, but also the overrun of the wiper arm and blade can be reduced and a predetermined wiping range can be maintained, and this can be reduced by an extremely simple structure. It can be realized at cost.

In the vehicle wiper of the second aspect, even if self-excited vibration of the wiper arm and blade is about to occur or a load acts, the vibration and the load (input from the wiper arm and blade to the pivot shaft) are elastic. It is absorbed by the bushes and consequently the chattering phenomenon is prevented.
For this reason, defective wiping, abnormal wear of the blade rubber, and deterioration of durability of the link portion for driving the wiper are prevented.

Further, here, even if the inertial force of the wiper arm and blade acts so as to largely elastically deform the elastic bush when the wiper arm reaches the limit of reciprocal rotation, the stopper provided on the cover acts on the arm head. Engagement restricts the further rotation of the wiper arm and maintains a predetermined wiping range. Therefore, the overrun phenomenon in which the wiper arm and blade are reversed beyond the predetermined wiping range is reduced.

Since the stopper limits the rotation of the wiper arm, the wiping range in the normal wiper operating state and the vehicle running state is larger than that in the high speed wiper operating state and the vehicle running state. It does not decrease and does not cause deterioration of visibility. Further, since the stopper is simply provided on the cover corresponding to the limit of the reciprocating rotation of the wiper arm, the structure is extremely simple and small, and the cost can be reduced.

As described above, not only the chattering phenomenon of the wiper arm and blade can be reduced, but also the overrun of the wiper arm and blade can be reduced and a predetermined wiping range can be maintained, and this can be reduced by an extremely simple structure. It can be realized at cost.

In the vehicle wiper according to the third aspect, if self-excited vibration of the wiper arm and blade is about to occur or a load acts, the elastic bush is elastically deformed around the stopper pin and the vibration or load (wiper arm & wiper arm
Input from the blade to the pivot shaft) is absorbed,
As a result, the chattering phenomenon is prevented. For this reason, defective wiping, abnormal wear of the blade rubber, and deterioration of durability of the link portion for driving the wiper are prevented. Further, the rotation range of the wiper arm can be limited to a predetermined wiping range by appropriately setting the elastic force of the elastic bush and the position of the stopper pin. Further, since the stopper pin that engages with the arm head is simply provided, the structure is extremely simple and small in size and can be realized at low cost.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

1 and 2 are sectional views showing details of a main part of the vehicle wiper 10 according to the first embodiment.
FIG. 3 shows the part in a plan view, and FIG. 4 shows the part in a side view. Further, FIG. 5 shows an overall configuration diagram of the wiper 10.

The wiper arm 12 of the wiper 10 includes an arm head 16 fixed to a pivot shaft 14 of the vehicle body.
And a retainer 18 connected to the arm head 16,
And an arm piece 22 that is connected to the retainer 18 and holds the wiper blade 20. A spring (not shown) is arranged between the arm head 16 and the arm piece 22 to apply a predetermined pressing force to the windshield glass (not shown) to the wiper blade 20.

As shown in detail in FIGS. 1 and 2, a ring-shaped elastic rubber bush 2 is provided at the base end of the arm head 16.
4 is integrally fixed, and a ring-shaped inner metal fitting 26 is integrally fixed to the core of the elastic rubber bush 24. Further, the inner metal fitting 26 is fitted into a tapered serration portion 28 formed at the tip of the pivot shaft 14 and fixed by a nut 30. As a result, the arm head 16 is attached to the pivot shaft 14 via the elastic rubber bush 24, the pivot shaft 14 rotates to reciprocate the wiper arm 12 within a predetermined range, and the elastic deformation of the elastic rubber bush 24 causes the arm head 16 to rotate. The (wiper arm 12 & wiper blade 20) is rotatable relative to the pivot shaft 14 by a predetermined angle.

Further, a cover 32 is fixed to the inner metal fitting 26 fixed to the pivot shaft 14. The cover 32 has an upper wall 34 and is formed into a substantially cylindrical shape in which a part of a peripheral side wall is cut out. Further, the upper wall 34 has a pair of fixing holes 36 formed therein.
The cover 32 covers the inner shaft 26 of the inner shaft 26 while covering the pivot shaft 14 and the elastic rubber bush 24 from above.
Further, the fixing pin 38 that is covered with the inner metal fitting 26 and is projectingly formed on the inner metal fitting 26 is fitted in the fixing hole 36 and is tightened by the nut 30 to be integrally attached to the inner metal fitting 26. That is, the cover 32 is configured to always rotate integrally with the pivot shaft 14 together with the inner metal fitting 26.

A rubber stopper 42 is attached to the peripheral side wall 40 of the cover 32 facing the arm head 16 so as to face the arm head 16. This rubber stopper 4
2 is opposed to the arm head 16 at a predetermined distance, and when the arm head 16 is relatively rotated with respect to the pivot shaft 14 (inner fitting 26) by a predetermined angle due to elastic deformation of the elastic rubber bush 24 described above. The arm head 16 (that is, the wiper arm 12 & the wiper blade 20) can be restricted from rotating by engaging with the arm head 16.

The rubber stopper 42 and the arm head 1
The opposing angle θ with respect to 6 is, for example, the wiper arm 12 & wiper blade 2 when the wiper arm 12 & wiper blade 20 reaches the limit of reciprocal rotation (upward reversal position and lower reversal position).
Even if the elastic rubber bush 24 is elastically deformed by the inertia force of 0, it is set corresponding to an angle (in other words, the maximum rotation angle of the wiper arm 12 and the wiper blade 20) in which a predetermined wiping range can be maintained.

Next, the operation of the first embodiment will be described. In the wiper 10 having the above structure, the arm head 16 (the wiper arm 12 and the wiper blade 20) is reciprocally rotated together with the inner metal fitting 26 by the rotation of the pivot shaft 14 to wipe away raindrops and the like.

Here, even if self-excited vibration of the wiper arm 12 or the wiper blade 20 is about to occur or a load acts from the outside, this vibration or load (input from the wiper arm 12 or the wiper blade 20 to the pivot shaft 14). Is absorbed by the elastic rubber bush 24, and as a result, the chattering phenomenon is reduced. For this reason, defective wiping, abnormal wear of the blade rubber, and deterioration of durability of the link portion for driving the wiper are prevented.

Further, here, for example, the wiper arm 12 &
Even if the inertial force of the wiper arm 12 or the wiper blade 20 acts to elastically deform the elastic rubber bush 24 largely when the wiper blade 20 reaches the reciprocal rotation limit (upward reversal position or downward reversal position), the cover 32 The rubber stopper 42 provided at the position is engaged with the arm head 16 to restrict the further rotation of the arm head 16, that is, the wiper arm 12 and the wiper blade 20, to maintain a predetermined wiping range. Therefore, the overrun phenomenon in which the wiper arm 12 and the wiper blade 20 are reversed beyond the predetermined wiping range is reduced.

Further, since the rubber stopper 42 limits the rotation of the arm head 16 (the wiper arm 12 and the wiper blade 20), the wiping range in the normal wiper operating state and the running state of the vehicle is the high speed wiper operating state. Also, it does not decrease compared to the wiping range in the traveling state of the vehicle and does not cause deterioration of visibility. Further, since the rubber stopper 42 is simply provided on the cover 32 in correspondence with the limit of the reciprocating rotation of the wiper arm 12 and the wiper blade 20, the structure is extremely simple and small in size and can be realized at low cost.

As described above, in the wiper 10, not only the chatter phenomenon of the wiper arm 12 and the wiper blade 20 can be reduced but also the wiper arm 12 and the wiper blade 20.
The overrun can be reduced and the predetermined wiping range can be reliably maintained, and this can be realized at a low cost with an extremely simple structure.

Next, another embodiment of the present invention will be described. The parts that are basically the same as those in the first embodiment have the first
The same reference numerals as in the embodiment are given and the description thereof is omitted.

FIG. 6 is a plan view showing details of main parts of the vehicle wiper 50 according to the second embodiment of the present invention.
FIG. 7 shows the relevant part in a sectional view.

In the wiper 50, the arm head 16 attached to the pivot shaft 14 via the elastic rubber bush 24 is formed with a pair of convex portions 52 protruding upward in parallel with the pivot shaft 14. Further, the cover 54 fixed to the inner metal fitting 26 is formed in a substantially disc shape, and a pair of notches 56 as stoppers are formed on the outer peripheral edge. The cover 54 covers the pivot shaft 14 and the elastic rubber bush 24 from above, covers the inner metal fitting 26 in a state where the convex portion 52 is located in the notch 56, and is further formed so as to project on the inner metal fitting 26. When the fixing pin 38 is fitted in the fixing hole 36, the fixing pin 38 is tightened by the nut 30 and
6 is attached integrally. Therefore, when the arm head 16 is relatively rotated with respect to the pivot shaft 14 (the inner metal fitting 26) by a predetermined angle due to the elastic deformation of the elastic rubber bush 24, the projection 52 is cut out.
The rotation of the arm head 16 (that is, the wiper arm 12 and the wiper blade 20) can be restricted by engaging with the peripheral wall of the.

Also in this case, the convex portion 52 and the notch portion 5 are also provided.
The opposing angle θ with respect to 6 is, for example, the wiper arm 12 & wiper blade 2 when the wiper arm 12 & wiper blade 20 reaches the limit of reciprocal rotation (upward reversal position and lower reversal position).
Even if the elastic rubber bush 24 is elastically deformed by the inertia force of 0, it is set corresponding to an angle (in other words, the maximum rotation angle of the wiper arm 12 and the wiper blade 20) in which a predetermined wiping range can be maintained.

Also in the wiper 50 having the above-described structure, the arm head 16 (the wiper arm 12 & the wiper blade 2) together with the inner metal fitting 26 is rotated by the rotation of the pivot shaft 14.
0) reciprocally rotates to wipe off raindrops and the like.

Here, even if self-excited vibration of the wiper arm 12 or the wiper blade 20 is about to occur or a load is applied from the outside, this vibration or load fluctuation is absorbed by the elastic rubber bush 24, resulting in the chatter phenomenon. Is reduced. For this reason, defective wiping, abnormal wear of the blade rubber, and deterioration of durability of the link portion for driving the wiper are prevented.

Further, here, for example, the wiper arm 12 &
Even when the inertial force of the wiper arm 12 or the wiper blade 20 acts to elastically deform the elastic rubber bush 24 largely when the wiper blade 20 reaches the reciprocal rotation limit (upward reversal position or downward reversal position), the arm head 16 convex portions 52
Engages with the peripheral wall of the cutout portion 56 provided in the cover 54 to restrict the further rotation of the arm head 16, that is, the wiper arm 12 and the wiper blade 20, and maintain a predetermined wiping range. Therefore, the wiper arm 12 &
An overrun phenomenon in which the wiper blade 20 is reversed beyond a predetermined wiping range is reduced.

Further, since the notch 56 is simply provided in the cover 54 in correspondence with the reciprocal rotation limit of the wiper arm 12 and the wiper blade 20, the structure is extremely simple and small in size and can be realized at low cost.

As described above, in the wiper 50, not only the chatter phenomenon of the wiper arm 12 and the wiper blade 20 can be reduced, but also the wiper arm 12 and the wiper blade 20.
The overrun can be reduced and a predetermined wiping range can be maintained, and this can be realized at a low cost with an extremely simple structure.

FIG. 8 is a plan view showing details of main parts of the vehicle wiper 60 according to the third embodiment of the present invention.

In the wiper 60, a concave portion 62 is formed in the arm head 16 attached to the pivot shaft 14 via the elastic rubber bush 24. Further, the cover 64 fixed to the inner metal fitting 26 is formed in a substantially disc shape, and a convex portion 66 as a stopper is formed on the outer peripheral edge. This cover 64 is for the pivot shaft 14
Also, the elastic rubber bush 24 is covered from above, and the convex portion 66 is positioned inside the concave portion 62 of the arm head 16 so as to cover and be attached to the inner metal fitting 26. Therefore, when the arm head 16 relatively rotates with respect to the pivot shaft 14 (the inner metal fitting 26) by a predetermined angle due to the elastic deformation of the elastic rubber bush 24, the convex portion 6
6 is configured to engage with the peripheral wall of the recessed portion 62 to restrict the rotation of the arm head 16 (that is, the wiper arm 12 & the wiper blade 20).

Also in this case, the opposing angle θ between the convex portion 66 and the concave portion 62 is, for example, when the wiper arm 12 & wiper blade 20 reaches the limit of reciprocal rotation.
Elastic rubber bush 2 due to inertia force of wiper blade 20
It is set in correspondence with an angle (maximum rotation angle of the wiper arm 12 & wiper blade 20) capable of maintaining a predetermined wiping range even when 4 is elastically deformed.

Even in the wiper 60 having the above-mentioned structure, even if self-excited vibration of the wiper arm 12 or the wiper blade 20 is about to occur or a load is applied from the outside, this vibration or load fluctuation is absorbed by the elastic rubber bush 24, As a result, the chattering phenomenon is reduced.

Further, here, for example, the wiper arm 12 &
Even if the inertial force of the wiper arm 12 or the wiper blade 20 acts to elastically deform the elastic rubber bush 24 largely when the wiper blade 20 reaches the reciprocal rotation limit (the upper inverted position or the lower inverted position), the cover 64 The convex portion 66 provided on the arm head 16 engages with the peripheral wall of the concave portion 62 of the arm head 16 so that the arm head 16 or the wiper arm 12 which is further above
& The rotation of the wiper blade 20 is limited, and a predetermined wiping range is maintained. Therefore, the overrun phenomenon in which the wiper arm 12 and the wiper blade 20 are reversed beyond the predetermined wiping range is reduced.

Further, since the convex portion 66 provided on the cover 64 limits the rotation of the arm head 16 (the wiper arm 12 & the wiper blade 20), the wiping range can be adjusted regardless of the wiper operating state and the vehicle running state. It does not decrease and does not cause deterioration of visibility. Further, since the convex portion 66 is simply provided on the cover 64 in correspondence with the reciprocal rotation limit of the wiper arm 12 and the wiper blade 20, the structure is extremely simple and small in size and can be realized at low cost.

As described above, in the wiper 60, not only the chattering phenomenon of the wiper arm 12 and the wiper blade 20 can be reduced, but also the wiper arm 12 and the wiper blade 20.
The overrun can be reduced and a predetermined wiping range can be maintained, and this can be realized at a low cost with an extremely simple structure.

FIG. 9 is a plan view showing details of main parts of the vehicle wiper 70 according to the fourth embodiment of the present invention.
FIG. 10 shows the part in a side view.

In the wiper 70, a tapered notch portion 72 is formed in a peripheral side wall portion of the arm head 16 attached to the pivot shaft 14 via the elastic rubber bush 24. The cover 74 fixed to the inner metal fitting 26 is formed in a substantially disc shape, and a tongue portion 76 as a stopper is formed on the outer peripheral edge thereof. This tongue 76
Is bent at a substantially right angle from the peripheral portion of the cover 74 and extends downward. The cover 74 covers the pivot shaft 14 and the elastic rubber bush 24 from above, and the tongue portion 76 is provided in the cutout portion 72 of the arm head 16.
Is attached to the inner metal fitting 26 in a state of being positioned. Therefore, when the arm head 16 rotates relative to the pivot shaft 14 (inner fitting 26) by a predetermined angle due to the elastic deformation of the elastic rubber bush 24, the tongue portion 76 engages with the peripheral wall of the cutout portion 72. Therefore, the rotation of the arm head 16 (that is, the wiper arm 12 and the wiper blade 20) can be restricted.

Also in the wiper 70 having the above-described structure, for example, when the wiper arm 12 and the wiper blade 20 reach the reciprocal rotation limit (upward reversal position or downward reversal position), the inertial force of the wiper arm 12 or the wiper blade 20 is elastic rubber bush 24. Even when the arm head 16 is further elastically deformed, the tongue portion 76 provided on the cover 74 engages with the peripheral wall of the cutout portion 72 of the arm head 16 and the further arm head 16
That is, the rotation of the wiper arm 12 and the wiper blade 20 is restricted, and the predetermined wiping range is maintained. Therefore, the overrun phenomenon in which the wiper arm 12 and the wiper blade 20 are reversed beyond the predetermined wiping range is reduced.

Further, since the tongue portion 76 provided on the cover 74 limits the rotation of the arm head 16 (the wiper arm 12 & the wiper blade 20), the wiping range is not reduced and the visibility is deteriorated. Nothing. Further, since the tongue portion 76 is simply provided on the cover 74 corresponding to the limit of the reciprocating rotation of the wiper arm 12 and the wiper blade 20, the structure is extremely simple and small in size and can be realized at low cost.

As described above, in the wiper 70, not only the chattering phenomenon of the wiper arm 12 and the wiper blade 20 can be reduced, but also the overrun of the wiper arm 12 and the wiper blade 20 can be reduced to maintain a predetermined wiping range. Moreover, this can be realized at a low cost with an extremely simple structure.

FIG. 11 is a perspective view showing details of main parts of a vehicle wiper 80 according to a fifth embodiment of the present invention. FIG. 12 is a longitudinal sectional view showing the part, and FIG. The respective portions are shown in cross section in FIG.

In the wiper 80, a stopper hole 82 is formed in the arm head 16 attached to the pivot shaft 14 via the elastic rubber bush 24 at a position separated from the pivot shaft 14 (elastic rubber bush 24) by a predetermined distance. There is. Further, the cover 84 fixed to the inner metal fitting 26 is formed into a substantially elliptical plate shape, and a stopper pin 86 is integrally fixed to the tip portion thereof. The stopper pin 86 is formed slightly smaller than the inner diameter of the stopper hole 82. As a result, the cover 84 covers the pivot shaft 14 and the elastic rubber bush 24 from above while the stopper pin 86 is inserted into the stopper hole 82 with a certain amount of clearance (with a gap), and the inner metal fitting 26 is covered with the cover 84. It is covered and tightened by a nut 30, and is integrally attached to the inner metal fitting 26. Therefore, when the arm head 16 rotates relative to the pivot shaft 14 (the inner metal fitting 26) by a predetermined angle due to the elastic deformation of the elastic rubber bush 24, the stopper pin 86 engages with the inner peripheral wall of the stopper hole 82. The rotation of the arm head 16 (that is, the wiper arm 12 and the wiper blade 20) can be restricted.

Also in this case, the facing angle θ between the stopper pin 86 and the inner peripheral wall of the stopper hole 82 as shown in FIG.
Is a predetermined wiping range even if the elastic rubber bush 24 is elastically deformed by the inertial force of the wiper arm 12 & wiper blade 20 when the wiper arm 12 & wiper blade 20 reaches the reciprocal rotation limit (upward reversal position and downward reversal position). Can be maintained (in other words, the maximum rotation angle of the wiper arm 12 and the wiper blade 20).

In the wiper 80 having the above-described structure, the arm head 16 (the wiper arm 12 & the wiper blade 2) is also moved together with the inner metal fitting 26 by the rotation of the pivot shaft 14.
0) reciprocally rotates to wipe off raindrops and the like.

Here, even if self-excited vibration of the wiper arm 12 or the wiper blade 20 is about to occur or a load is applied from the outside, this vibration or load is applied to the elastic rubber bush 2.
4 is absorbed by being twisted, and as a result, the chattering phenomenon is reduced. For this reason, defective wiping, abnormal wear of the blade rubber, and deterioration of durability of the link portion for driving the wiper are prevented.

Further, here, for example, the wiper arm 12 &
Even when the inertial force of the wiper arm 12 or the wiper blade 20 acts to elastically deform the elastic rubber bush 24 largely when the wiper blade 20 reaches the reciprocal rotation limit (upward reversal position or downward reversal position), the arm head The inner peripheral wall of each of the 16 stopper holes 82 engages with a stopper pin 86 provided on the cover 84 to restrict further rotation of the arm head 16, that is, the wiper arm 12 and the wiper blade 20, and maintain a predetermined wiping range. . Therefore, the overrun phenomenon in which the wiper arm 12 and the wiper blade 20 are reversed beyond the predetermined wiping range is reduced. Even in this state (where the stopper pin 86 is in contact with the inner peripheral wall of the stopper hole 82), when the wiper arm 12 or the wiper blade 20 vibrates or changes in load, the elastic rubber bush 24 moves around the stopper pin 86. compression·
By being pulled and elastically deformed, vibrations and loads are absorbed, and chattering and noise are reduced.

Further, since the stopper pin 86 is simply provided on the cover 84 and the stopper hole 82 is provided on the arm head 16 in correspondence with the reciprocal rotation limit of the wiper arm 12 and the wiper blade 20, the structure is extremely simple and small in size. Can be realized at cost.

As described above, in the wiper 80, not only the chatter phenomenon of the wiper arm 12 and the wiper blade 20 can be reduced, but also the wiper arm 12 and the wiper blade 20.
The overrun can be reduced and a predetermined wiping range can be maintained, and this can be realized at a low cost with an extremely simple structure.

Next, FIGS. 14A and 14B are plan views showing details of main parts of the vehicle wiper 90 according to the sixth embodiment of the present invention, and FIG. Is shown in a vertical sectional view, and in FIG. 16, the portion is shown in a horizontal sectional view.

In the wiper 90, the arm head 16 attached to the pivot shaft 14 via the elastic rubber bush 24 (not shown) similarly to the above-described embodiment has a predetermined distance from the pivot shaft 14 (elastic rubber bush 24). A bearing fitting hole 92 is formed at a separated position.
Further, the cover 94 fixed to the inner metal fitting 26 is formed in a substantially elliptical plate shape, and a stopper pin 96 is integrally fixed to the tip portion thereof. The stopper pin 96 is rotatably supported by a bearing 98 fitted in the bearing fitting hole 92 as shown in FIGS. Therefore, when vibration or a load acts on the arm head 16 from the outside, the arm head 16 relatively rotates (displaces) with respect to the pivot shaft 14 around the stopper pin 96, whereby the elastic rubber bush 24 is compressed. It is configured to be pulled and elastically deformed.

Even in this case, the relative maximum rotation angle θ of the arm head 16 with respect to the pivot shaft 14 about the stopper pin 96 is, for example, the wiper arm 12 &
An angle at which a predetermined wiping range can be maintained even when the elastic rubber bush 24 is elastically deformed by the inertial force of the wiper arm 12 and the wiper blade 20 when the wiper blade 20 reaches the reciprocal rotation limit (upward reversal position and downward reversal position). In other words,
The maximum rotation angle of the wiper arm 12 and the wiper blade 20) is set.

In the wiper 90 having the above structure, if self-excited vibration of the wiper arm 12 or the wiper blade 20 is attempted or a load is applied from the outside, the arm head 16 rotates relative to the pivot shaft 14 about the stopper pin 96. (Transition), whereby the elastic rubber bush 24 is compressed / pulled and elastically deformed, thereby absorbing vibration and load, and reducing chattering phenomenon and sound. For this reason, defective wiping, abnormal wear of the blade rubber, and deterioration of durability of the link portion for driving the wiper are prevented.

Further, the stopper pin 9 of the arm head 16
Since the maximum relative rotation angle θ with respect to the pivot shaft 14 about 6 is set in correspondence with the maximum rotation angle of the wiper arm 12 & wiper blade 20, a predetermined wiping range of the wiper arm 12 & wiper blade 20 is maintained. Therefore, the overrun phenomenon in which the wiper arm 12 and the wiper blade 20 are reversed beyond the predetermined wiping range is reduced.

Further, since the stopper pin 96 which engages with the arm head 16 so as to be rotatable relative to each other is simply provided, the structure is extremely simple and small in size and can be realized at low cost.

As described above, also in the wiper 90, the chattering phenomenon of the wiper arm 12 and the wiper blade 20 can be reduced, and this can be realized with an extremely simple structure at low cost.

[0069]

As described above, the vehicle wiper according to the present invention can reduce the chattering phenomenon of the wiper arm and blade, and further reduce the overrun of the wiper arm and blade to maintain a predetermined wiping range. It has an excellent effect that it can be realized with a very simple structure at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line 1-1 of FIG. 4 showing details of a main part of a vehicle wiper according to a first exemplary embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG. 3 showing the details of the main part of the vehicle wiper according to the first embodiment of the present invention.

FIG. 3 is a plan view showing details of a main part of the vehicle wiper according to the first embodiment of the present invention.

FIG. 4 is a side view showing details of a main part of the vehicle wiper according to the first exemplary embodiment of the present invention.

FIG. 5 is a perspective view showing an overall configuration of a vehicle wiper according to the first exemplary embodiment of the present invention.

FIG. 6 is a plan view showing details of a main part of a vehicle wiper according to a second embodiment of the present invention.

FIG. 7 is a sectional view taken along line 7-7 of FIG. 6 showing the details of the main part of the vehicle wiper according to the second embodiment of the present invention.

FIG. 8 is a plan view showing details of a main part of a vehicle wiper according to a third embodiment of the present invention.

FIG. 9 is a plan view showing details of a main part of a vehicle wiper according to a fourth embodiment of the present invention.

FIG. 10 is a side view showing details of a main part of the vehicle wiper according to the fourth exemplary embodiment of the present invention.

FIG. 11 is a perspective view showing details of a main part of a vehicle wiper according to a fifth embodiment of the present invention.

FIG. 12 is a vertical cross-sectional view showing details of a main part of a vehicle wiper according to a fifth embodiment of the present invention.

FIG. 13 is a cross-sectional view showing details of a main part of a vehicle wiper according to a fifth embodiment of the present invention.

FIG. 14 is a plan view showing details of a main part of a vehicle wiper according to a sixth embodiment of the present invention.

FIG. 15 is a vertical cross-sectional view showing details of a main part of a vehicle wiper according to a sixth embodiment of the present invention.

FIG. 16 is a transverse cross-sectional view showing details of a main part of a vehicle wiper according to a sixth embodiment of the present invention.

[Explanation of symbols]

 10 Wiper 12 Wiper Arm 14 Pivot Shaft 16 Arm Head 24 Elastic Rubber Bushing 26 Inner Metal Fitting 32 Cover 42 Rubber Stopper 50 Wiper 52 Convex 54 Cover 56 Notch 60 Wiper 62 Recess 64 Cover 66 Convex 70 Wiper 72 Notch 74 Cover 76 Tongue 80 Wiper 82 Stopper hole 86 Stopper pin 90 Wiper 92 Bearing fitting hole 96 Stopper pin

Claims (3)

[Claims] 1. An arm head of a wiper arm is attached to a pivot shaft through an elastic bush, and the wiper arm is reciprocally rotated within a predetermined range by rotation of the pivot shaft, and the arm head is moved by elastic deformation of the elastic bush. In a vehicle wiper that can be displaced relative to the pivot shaft, the relative displacement of the arm head with respect to the pivot shaft is limited when the arm head is displaced with respect to the pivot shaft by a predetermined amount due to elastic deformation of the elastic bush. A wiper for a vehicle, comprising: 2. The cover is connected to the pivot shaft to cover the pivot shaft and an elastic bush from above, and the arm head is attached to the pivot shaft by elastic deformation of the elastic bush provided on the cover. The wiper for a vehicle according to claim 1, further comprising a stopper that comes into contact with the arm head and restricts rotation of the wiper arm when the wiper arm rotates relative to a predetermined angle. 3. An arm head of a wiper arm is attached to a pivot shaft via an elastic bush, and the pivot shaft reciprocates to rotate the wiper arm within a predetermined range, and the elastic bush elastically deforms the arm head. A vehicle wiper capable of moving relative to the pivot shaft, wherein the wiper is integrally provided with the pivot shaft, always rotates with the pivot shaft, and relatively rotatable with respect to the arm head at a position separated from the pivot shaft. A wiper for a vehicle, comprising a stopper pin engaging with, and the elastic bush elastically deforms around the stopper pin so that the arm head is displaced relative to the pivot shaft.