JP2001151079A - Wiper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper device that can offer improved wiping performance because of no areas left unwiped in the upper middle of a windshield. SOLUTION: This wiper device 1 comprises a driving gear 7 fixed on a pivot shaft 4 turnable via a first link mechanism 3, a driven gear 8 in mesh with the driving gear 7, a second link mechanism 11 coupled to the driven gear 8 via an idler shaft 9, and a wiper arm 5 including a wiper arm base 5a coupled to the pivot shaft 4 and a wiper arm body 5b turnably coupled to the second link mechanism 11 so as to have movement along the length of the wiper arm base 5a and mounted with a wiper blade 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wiper device for wiping a wiping surface with a wiper blade.

[0002]

2. Description of the Related Art In a wiper apparatus for wiping a wiping surface with a wiper blade, a pivot shaft is rotated by a wiper motor via a link mechanism, so that a wiper arm connected to the pivot shaft has a wiping surface centered on the pivot shaft. It is known that an oscillating motion of an arc is performed on the upper side, and the wiping operation is performed by the wiper blade moving in an arc on the wiping surface while pressing the wiper blade attached to the wiper arm against the wiping surface by the oscillating motion of the arc of the wiper arm. .

[0003]

In the conventional wiper blade in which the wiper blade moves in an arc, as shown by the broken line in FIG. 5, the left and right corners of the windscreen can be left unwiped. Japanese Patent Application Laid-Open No. 58-844 discloses a wiper device for moving a wiper blade to a corner portion by extending a wiper arm when the wiper blade wipes a corner portion of a windscreen.
No. 5 discloses this. However, in recent years, the windscreen has tended to be vertically long with the improvement of the manufacturing technology of the automobile body, and in the wiper device of the above publication, the amount of expansion and contraction of the wiper arm has been reduced as shown by the dashed lines in FIGS. Since there is a minimum between the reversal position and the center position on the windscreen, there is no remaining unwiped portion at the corner of the windscreen, but there is a problem that the unwiped portion can be left above the center portion of the windscreen.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wiper device capable of improving the wiping performance by eliminating the unwiped portion at the upper portion of the center of the windscreen.

[0005]

Configuration of the Invention

[0006]

According to a first aspect of the present invention, there is provided a wiper apparatus having a wiper motor having an output shaft which is rotated by energization, and a rotating shaft which is connected to the output shaft of the wiper motor and which reciprocates by the rotation of the output shaft. A link mechanism having a moving member, a pivot shaft fixed to a rotating member of the link mechanism, a drive gear fixed to the pivot shaft, and a driven gear meshed with the drive gear and rotating by varying the rotation of the drive gear. An idler shaft fixed to the driven gear, a first arm connected to the idler shaft, a second arm rotatably connected to the first arm, and a wiper arm base connected to the pivot shaft And a wiper arm body movably in the longitudinal direction of the wiper arm base, coupled to the wiper arm base, and rotatably coupled to the second arm. An arm and a wiper blade mounted on the wiper arm main body of the wiper arm and pressed against the wind screen, wherein the idler shaft is located inside a locus drawn by a joint portion between the wiper arm main body and the second arm, and a pivot shaft wind screen is provided. It is characterized in that it is arranged on the side.

In a wiper device according to a second aspect of the present invention, in addition to the configuration of the first aspect, a case is provided for accommodating a driving gear and a driven gear, respectively, and the case has an idler shaft rotatably supporting an idler shaft. It is characterized in that the shaft support is formed.

[0008] In the wiper device according to a third aspect of the present invention, in addition to the configuration of the second aspect, the wiper arm base includes:
A base head coupled to the pivot shaft is provided, and a rod protruding from the base head is provided.The wiper arm body has a rod insertion portion into which the rod of the wiper arm base can be inserted. And a second arm connecting portion to which the second arm is rotatably connected is formed.

[0009]

In the wiper device according to the first, second and third aspects of the present invention, when the wiper motor is operated and the pivot shaft starts rotating by the link mechanism, the wiper arm base and the wiper arm main body are rotated, and the wiper blade is rotated. Starts wiping the wiping surface, the drive gear is rotated by the rotation of the pivot shaft, the driven gear is rotated, and the idler shaft starts to rotate. At this time, the wiper arm body is closest to the pivot shaft by the first and second arms. And
When the wiper blade approaches the side portion of the windscreen, the first and second arms move the wiper arm body to a position farthest from the pivot axis, and wipe the upper portion of the windscreen with the wiper blade. Thereafter, when the wiper blade approaches the center of the windscreen, the first and second arms move the wiper arm body to a position slightly closer to the pivot axis, and wipe the upper portion of the windscreen with the wiper blade. Therefore, the wiper blade wipes the upper part of the side and the upper part of the center of the windscreen.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

[0011]

1 to 11 show an embodiment of a wiper device according to the present invention.

The illustrated wiper apparatus 1 includes a wiper motor 2, a first link mechanism 3, a pivot shaft 4, a wiper arm 5, a wiper blade 6, a drive gear 7, a driven gear 8, an idler shaft 9, a case 10, a second link. The first link mechanism 3 includes a motor arm 1
2, a first lever 13, a second lever 14, a third lever (rotating member) 15, and a fourth lever 16;
The link mechanism 11 includes a first arm 17 and a second arm 18.

The wiper motor 2 has an output shaft 2a and is electrically connected to a wiper control circuit. When the wiper switch provided in the wiper control circuit is switched to the low-speed mode, the output shaft 2a is rotated at a low speed. When the wiper switch is switched to the high-speed mode, the output shaft 2a is rotated at a high speed, and the wiper switch is switched to the intermittent mode. Is switched to
The output shaft 2a is rotated after an intermittent pause. As shown in FIG. 3, the output shaft 2a of the wiper motor 2 has an output shaft coupling portion 12 formed at one end of the motor arm 12.
b is fixed by screwing the nut 19.

As shown in FIG. 3, the motor arm 12 has an output shaft coupling portion 12b disposed at one end of a plate-shaped motor arm main body 12a and a first ball at the other end of the motor arm main body 12a. The pin 20 is fixed. A first ball retainer 21 provided at one end of a first lever 13 provided in the first link mechanism 3 is coupled to the first ball pin 20 via a spherical pair. The motor arm 12 rotates together with the output shaft 2a of the wiper motor 2.

The first lever 13 is provided with a first ball retainer 21 at one end of an I-shaped plate-shaped first lever body 13a, and at the other end of the first lever body 13a. A second lever coupling portion 13b is formed, and a fourth lever coupling portion 13c is provided substantially at the center of the first lever main body 13a.
Are formed. The second lever coupling portion 13b is
The lever 14 is rotatably coupled to a first lever coupling portion 14b formed at one end of the lever 14. The first lever connecting portion 13c is rotatably connected to a first lever connecting portion 16c formed at the other end of the fourth lever 16.

The second lever 14 is provided with a first lever coupling portion 14b at one end of a second lever body 14a formed in an elliptical plate shape, and a second lever body 14a. A third lever coupling portion 14c is formed at the other end. The third lever coupling portion 14c is a third lever 1
5 is rotatably coupled to a second lever coupling portion 15b formed at one end.

The third lever (rotating member) 15 has a second lever main body 15a formed in an I-shaped plate, and one end of the third lever main body 15a.
And the third lever coupling portion 15b
A fourth lever connecting portion 15 is attached to the other end of the lever body 15a.
c is formed, and a round-hole-shaped pivot shaft coupling portion 15d is formed substantially at the center of the third lever body 15a. The fourth lever connecting portion 15c is rotatably connected to a third lever connecting portion 16b formed at one end of the fourth lever 16.

The fourth lever 16 is provided with a third lever connecting portion 16b at one end of a fourth lever body 16a formed in an elliptical plate shape. A first lever coupling portion 16c is formed at the other end. The first lever connecting portion 16c is connected to the first lever 1
The third fourth lever coupling portion 13c is rotatably coupled to the third fourth lever coupling portion 13c.

In the first link mechanism 3, the second and third levers 14, 15 are arranged above the first lever 13, and the fourth lever 16 is arranged below the first lever 13. Then, the first, second, third, and fourth levers 13, 1
The X-link mechanism is formed by 4, 15, and 16.
When the motor arm 12 rotates, the rotation of the motor arm 12 is converted into a reciprocating movement of the first lever 13, whereby the second lever 14 is reciprocated and the fourth lever 16 is moved.
Is reciprocated, and the third lever 15 is reciprocated about the pivot shaft coupling portion 15d.

The pivot shaft connecting portion 15 of the third lever 15
d has a serration receiving shape. A serration-shaped third lever coupling portion 4b formed on the pivot shaft 4 is press-fitted into the pivot shaft coupling portion 15d, and the nut 22 is connected to the third lever coupling portion 15d. The third lever 15 is fixed to the pivot shaft 4 by being screwed into the portion 4b.

The pivot shaft 4 has a serrated third lever connecting portion 4b at the base end of the pivot shaft main body 4a formed in a round bar shape, and a wiper arm connecting portion 4c at the distal end of the pivot shaft main body 4a. Are formed. And
A drive gear 7 is fixed substantially at the center of the pivot shaft main body 4a. The pivot shaft 4 reciprocates with the third lever 15. The pivot shaft 4 has a wiper arm joint 4c protruding from a pivot hole formed in the cowl top panel, and a wiper arm base 5a is screwed to the wiper arm joint 4c.

A case 10 is arranged on the third lever 15. The case 10 includes a lower case 10a and an upper case 10b.

In the lower case 10a, a cylindrical pivot shaft insertion hole 10a2 is formed substantially at the center of a disk-shaped lower case main body 10a1, and a cylindrical idler shaft is formed at the outer edge of the lower case main body 10a1. The support part 10a3 is formed. Pivot shaft insertion hole 10a
2, the base end side of the pivot shaft 4 is inserted. The base end side of the idler shaft 9 is rotatably inserted into the idler shaft support 10a3.

In the upper case 10b, a pivot shaft insertion hole 10b2, which is a pair with the pivot shaft insertion hole 10a2 of the lower case 10a, is formed substantially at the center of the upper case body 10b1 formed in a disc shape.
idler shaft support 1 of lower case 10a on the outer edge of b1
A pair of idler shaft support portions 10b3 is formed with Oa3. The distal end side of the pivot shaft 4 is inserted into the pivot shaft insertion hole 10a2. Pivot shaft insertion hole 10
The pivot shaft 4 inserted into the a2 has its tip end protruding above the upper case 10b. The tip end side of the idler shaft 9 is rotatably inserted into the idler shaft support portion 10b3. Lower case 10a, upper case 10
A drive gear 7 and a driven gear 8 are accommodated in b.

The drive gear 7 has a gear base 7a having a fan shape of approximately 180 degrees and a central portion fixed to a pivot shaft main body 4a of a pivot shaft 4. A spur gear tooth portion 7b is attached to an outer edge of the gear base 7a. Are formed. Since the drive gear 7 is integrally fixed to the pivot shaft 4, the drive gear 7 rotates together with the pivot shaft 4.

The driven gear 8 has a disk-shaped gear base 8a having a central portion fixed to an idler shaft 9, and a spur gear tooth portion 8b formed on an outer edge of the gear base 8a. The number of teeth of the driven gear 8 and the number of teeth of the driving gear 7 are 1 to 4
Is selected.

In the idler shaft 9, the base end of the round idler shaft main body 9a is inserted into the idler shaft support portion 10a3 of the lower case 10a, and the distal end side of the idler shaft main body 9a is supported by the idler shaft support of the upper case 10b. Part 10b3
And is rotatably supported by the case 10.
Since the teeth 8b of the driven gear 8 mesh with the teeth 7b of the drive gear 7, the idler shaft 9 is rotated at a reduced speed. The idler shaft 9 inserted into the idler shaft support portion 10b3 of the upper case 10b is disposed so that its tip protrudes above the upper case 10b, and is disposed so as to protrude from an idler shaft hole formed in the cowl top panel. An idler shaft coupling portion 17b formed on the first arm 17 is fixed to the distal end. The idler shaft 9 is located inside the trajectory drawn by the third ball pin 24 fixed to the arm head main body 5b5 of the wiper arm 5, and is disposed on the windscreen 60 side of the pivot shaft 4.

A wiper arm 5 is attached to the wiper arm connecting portion 4c of the pivot shaft 4 protruding above the upper case 10b.
Is installed. The wiper arm 5 includes a wiper arm base 5a and a wiper arm main body 5b. The wiper arm main body 5b includes an arm head 5b1,
A retainer 5b2 and an arm piece 5b3 are provided.

The wiper arm base 5a is provided with a base head 5a1 and a rod 5a2.

The base head 5a1 is arranged on the base end side of the wiper arm base 5a. The base head 5a1 has a pivot shaft connecting hole 5a3 penetrating vertically, the wiper arm connecting portion 4c of the pivot shaft 4 is inserted through the pivot shaft connecting hole 5a3, and the nut 23 is screwed into the wiper arm connecting portion 4c. As a result, the wiper arm base 5a is fixed to the pivot shaft 4.

The rod 5a2 is formed in a round bar shape and protrudes from the base head 5a1.
Is inserted into a rod insertion portion 5b4 formed in the arm head 5b1 of the wiper arm main body 5b. The wiper arm base 5a reciprocates with the pivot shaft 4.

The arm head 5b1 is formed with a rod insertion portion 5b4 having a round hole shape in the axial direction of the arm head body 5b5 having a rectangular shaft shape.
In No. 4, since the base end side of the arm head main body 5b5 is open, the rod 5a2 of the wiper arm base 5a is inserted into the rod insertion portion 5b4. Arm head 5
b1 is supported by the rod 5a2 so as to be movable in the axial direction of the rod 5a2.

A third ball pin (second arm connecting portion) 24 is fixed to the arm head 5b1 on the lower surface side of the arm head body 5b5. This third ball pin 2
4 has a third arm attached to the other end of the second arm 18.
Of ball retainers 25 are connected via spherical pairs. The wiper arm 5 has a wiper arm cover 5b6 fitted to the wiper arm base 5a and the arm head 5b1 to cover the outside.

The arm head 5b1 has a retainer connecting portion 5b7 formed at the distal end of the arm head main body 5b5, and the base end of the retainer 5b2 is rotatably connected to the retainer connecting portion 5b7.

The base end of the arm piece 5b3 is riveted to the tip end of the retainer 5b2, and the wiper blade 6 is attached to the tip end of the arm piece 5b3. Base end of arm piece 5b3 and arm head 5b
Since the arm springs (not shown) are locked to the front end of the wiper blade 6, the wiper blade 6 is pressed against the wind screen 60 by the arm springs.

An idler shaft connecting portion 17b formed at one end of the first arm 17 is fixed to the idler shaft 9 protruding above the upper case 10b.
In the first arm 17, an idler shaft coupling portion 17b is disposed at one end of a plate-shaped first arm body 17a,
A second ball pin 2 is attached to the other end of the first arm body 17a.
6 is fixed. The second ball pin 26 has a second ball pin 26
A second ball retainer 27 attached to one end of the arm 18 is connected via a spherical pair. The first arm 17 rotates together with the idler shaft 9.

The second arm 18 has a plate-shaped second arm.
The second ball retainer 2 is attached to one end of the arm body 18a.
7 is attached, and a third ball retainer 25 is attached to the other end of the second arm body 18a. The third ball retainer 25 is a third ball pin 2 fixed to the lower surface side of the arm head body 5b5 of the arm head 5b1.
4 through a spherical pair. Second arm 1
8 moves back and forth by rotation of the first arm 17.

In the second link mechanism 11, a crank lever mechanism is formed by the first and second arms 17, 18, and the third ball retainer 25 of the second arm 18 is provided.
Is connected to the third ball pin 24 of the arm head 5b1 via a spherical pair, and has a function of expanding and contracting the wiper arm main body 5b from the wiper arm base 5a with the movement of the second arm 18.

At this time, the amount of expansion and contraction of the wiper arm main body 5b by the second link mechanism 11 with respect to the swing angle of the wiper when the pivot shaft 4 rotates is determined by the wiper blade 6 as shown by the solid line in FIG. When at the first reversal position A1 also serving as the stop position on the windscreen 60, the third
Is the value n1 at which the ball pin 24 comes closest to the pivot shaft 4. Then, when the wiper blade 6 performs the wiping operation and approaches one side portion of the wind screen 60, the third ball pin 24 becomes the value n2 farthest from the pivot shaft 4, and the wiper blade 6 When approaching the central portion, the third ball pin 24 has a value n3 slightly approaching the pivot shaft 4,
Thereafter, when the wiper blade 6 performs the wiping operation and approaches the other side portion of the windscreen 60, the third ball pin 24 becomes the value n2 farthest from the pivot shaft 4 in the same manner as the one side portion. , The wiper blade 6 is in the second reversal position A on the windscreen 60.
5, the third inversion is performed in the same manner as the first inversion position A1.
Is the value n1 at which the ball pin 24 comes closest to the pivot shaft 4.

In such a wiper device 1, the wiper motor 2 is screw-fixed to an inner panel such as a dash upper panel of the vehicle body, and the wiper arm connecting portion of the pivot shaft 4 that is disposed so as to protrude from a pivot hole formed in the cowl top panel. 4c, the wiper arm base 5a is screwed,
The first arm 1 is attached to the tip of an idler shaft 9 which is arranged to protrude from an idler shaft hole formed in the cowl top panel.
7, the idler shaft connecting portion 17b is fixed, the arm head 5b1 of the wiper arm 5 is connected to the second arm 18, and the wiper motor 2 is electrically connected to the wiper control circuit and mounted on the vehicle body.

When the wiper switch provided in the wiper control circuit is in the stop mode, as shown in FIG. 7, the wiper blade 6 is at the first reversal position A1, and the wiper arm main body 5b of the wiper arm 5 is extended and retracted. Since the quantity is the value n1, it is at the first position C1 closest to the pivot axis 4.

When the wiper switch of the wiper control circuit is switched from the stop mode to the low speed mode, the wiper motor 2
Output shaft 2a starts rotating at a low speed. When the output shaft 2a of the wiper motor 2 starts rotating at a low speed, the pivot shaft 4 is rotated counterclockwise in FIG. 7 via the first link mechanism 3, and the drive gear 7 is rotated counterclockwise in FIG. 7, the driven gear 8 is rotated clockwise in FIG. 7, and as shown in FIG. 8, the second link mechanism 11 causes the wiper arm main body 5b of the wiper arm 5 to set the amount of expansion and contraction to a value n1.
Is moved to the second position C2 furthest from the pivot shaft 4 while being changed from
Performs the wiping operation up to the position A2. At this time, the wiper blade 6 moves the pivot shaft 4 while the amount of expansion and contraction of the wiper arm body 5b of the wiper arm 5 is changed from the value n1 to the value n2.
Because it is moved to the second position C2 farthest from the
The first side upper area 60a, which is the upper part on one side of the wind screen 60 shown in FIG. 5, is wiped.

As the output shaft 2a of the wiper motor 2 continues to rotate at a low speed, the pivot shaft 4 continues to rotate counterclockwise in FIG. 8 via the first link mechanism 3, and the drive gear 7 rotates in the counterclockwise direction in FIG. By continuing to rotate clockwise, the driven gear 8 is rotated clockwise in FIG. 8, and as shown in FIG. 9, the second link mechanism 11 causes the wiper arm main body 5b of the wiper arm 5 to reduce the amount of expansion and contraction. While being changed from the value n2 to the value n3, the wiper blade 6 is moved to the third position C3 slightly approaching the pivot shaft 4, and the wiper blade 6 performs the wiping operation to the position A3. At this time, the wiper blade 6 is moved to the third position C3 where the arm head 5b1 of the wiper arm 5 is slightly closer to the pivot shaft 4 while the amount of expansion and contraction is changed from the value n2 to the value n3, as shown in FIG. The center upper area 60b, which is the upper part of the center of the windscreen 60, is wiped.

As the output shaft 2a of the wiper motor 2 continues to rotate at a low speed, the pivot shaft 4 continues to rotate counterclockwise in FIG. 9 via the first link mechanism 3, and the drive gear 7 rotates in FIG. By continuing to rotate counterclockwise, the driven gear 8 is rotated clockwise in FIG. 9, and as shown in FIG. 10, the second link mechanism 11 causes the wiper arm body 5b of the wiper arm 5 to expand and contract. From the value n3 to the value n2
The second farthest from the pivot axis 4 while being changed to
Is moved again to the position C2, and the wiper blade 6 performs the wiping operation to the position A4. At this time, the wiper blade 6
The arm head 5b1 of the wiper arm 5 is moved to the second position C2 farthest from the pivot shaft 4 while the amount of expansion and contraction is changed from the value n3 to the value n2, so that the other side of the windscreen 60 shown in FIG. The second side upper area 60c, which is the upper part of the side, is wiped.

As the output shaft 2a of the wiper motor 2 continues to rotate at a low speed, the pivot shaft 4 continues to rotate counterclockwise in FIG.
10 continues to rotate counterclockwise in FIG. 10, the driven gear 8 is rotated clockwise in FIG. 10, and the second link mechanism 11 causes the wiper arm body of the wiper arm 5 to move as shown in FIG. 5b indicates the expansion / contraction amount from the value n2 to the value n1.
The first one that is closest to the pivot axis 4 while being changed to
Is moved to the position C1, and the wiper blade 6 performs the wiping operation to the second reversal position A5.

When the wiper blade 6 reaches the second reversing position A5, the pivot shaft 4 reverses clockwise in FIG. 11 via the first link mechanism 3 and starts rotating, and the drive gear 7 rotates in FIG. Since the driven gear 8 is rotated clockwise and the driven gear 8 is rotated counterclockwise in FIG. 11, the wiper blade 6 performs the wiping operation in the opposite direction, and the wiper blade 6 reaches the first reversing position A1. When the wiper switch is switched to the low speed mode, the above operation is repeated.

When the wiper switch is switched from the low speed mode to the stop mode, until the wiper blade 6 reaches the first reversal position A1 which also serves as the stop position,
The power supply to the wiper motor 2 is continuously performed by the wiper fixed position stop circuit built in the wiper motor 2, and when the wiper blade 6 reaches the first reversal position A1 also serving as the stop position, the wiper motor 2 sends the signal to the wiper motor 2 from the wiper control circuit. Is cut off, and the wiper blade 6 stops at the first reversal position A1 which also serves as the stop position.

When the wiper switch is switched to the high-speed mode, the output shaft 2a of the wiper motor 2 is rotated at a high speed. In contrast, when the wiper switch is switched to the intermittent mode, the output shaft 2a of the wiper motor 2 is switched. Is rotated intermittently with an intermittent pause, and the wiping operation by the wiper blade 6 is performed in the same manner as described above.

As described above, in the wiper device 1, the pivot shaft 4 is reciprocated by the rotation of the output shaft 2a of the wiper motor 2 via the first link mechanism 3, and the drive gear is driven by the reciprocal rotation of the pivot shaft 4. 7, via the driven gear 8, the second
Of the wiper arm main body 5b of the wiper arm 6 at the first position C1, the second position C2, and the third position C
3, the wiper blade 6 is repeatedly moved to the second position C2 and the first position C1, respectively.
Wipes the first side upper area 60a, the center upper area 60b, and the second side upper area 60c of the wind screen 60, respectively.

[0050]

As described above, according to the wiper device according to the first, second, third, and fourth aspects of the present invention, when the wiper motor is operated and the pivot shaft starts rotating by the link mechanism, the wiper arm is activated. The base and the wiper arm body are rotated, the wiper blade starts wiping the wiping surface, the drive gear is rotated by the rotation of the pivot shaft, the driven gear is rotated, and the idler shaft starts rotating. At this time, the wiper arm main body is brought closest to the pivot shaft by the second link mechanism. Then, when the wiper blade approaches the side portion of the windscreen, the wiper arm body is moved to a position farthest from the pivot axis by the second link mechanism, and the upper side portion of the windscreen is wiped with the wiper blade. Thereafter, when the wiper blade approaches the center of the windscreen, the second link mechanism moves the wiper arm body to a position slightly closer to the pivot axis, and wipes the upper portion of the windscreen with the wiper blade. Therefore, the wiper blade wipes the upper part of the side and the upper part of the center of the windscreen. Therefore, there is an excellent effect that the wiping performance can be improved by eliminating the remaining wiping at the upper portion of the center portion of the wind screen.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of a wiper device according to the present invention.

FIG. 2 is a front view of a main part of the wiper device shown in FIG.

FIG. 3 is an external perspective view illustrating an assembling relationship of main parts of the wiper device shown in FIG. 1 as viewed from obliquely above.

FIG. 4 is an external perspective view illustrating an assembling relationship of main parts of the wiper device shown in FIG. 1 as viewed obliquely from below.

FIG. 5 is a characteristic diagram of a wiping locus in the wiper device shown in FIG. 1;

6 is a characteristic diagram illustrating a relationship between a wiper swing angle and an amount of expansion and contraction in the wiper device illustrated in FIG.

FIG. 7 is an operation explanatory view of the wiper device shown in FIG. 1;

FIG. 8 is an operation explanatory view of the wiper device shown in FIG. 1;

FIG. 9 is an operation explanatory view of the wiper device shown in FIG. 1;

FIG. 10 is an operation explanatory view of the wiper device shown in FIG. 1;

FIG. 11 is an operation explanatory view of the wiper device shown in FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 wiper device 2 wiper motor 2a output shaft 3 (link mechanism) first link mechanism 4 pivot shaft 5 wiper arm 5a wiper arm base 5a1 base head 5a2 rod 5b wiper arm main body 5b4 rod insertion portion 6 wiper blade 7 drive gear 8 driven gear 9 idler shaft 10 Case 10a3 Idler shaft support 10b3 Idler shaft support 11 Second link mechanism 15 (Rotating member) Third lever 17 First arm 18 Second arm 24 (Third ball pin) Second arm Joint

Claims (3)

[Claims] 1. A wiper motor having an output shaft that rotates when energized, a link mechanism that is connected to the output shaft of the wiper motor, and that has a rotating member that reciprocates by the rotation of the output shaft, and a rotation of the link mechanism. A pivot shaft fixed to the member, a drive gear fixed to the pivot shaft, a driven gear meshed with the drive gear, configured to rotate while varying the rotation of the drive gear, and an idler fixed to the driven gear A first arm connected to the idler shaft, a second arm rotatably connected to the first arm, and a wiper arm base connected to the pivot shaft; A wiper arm having a wiper arm body movably coupled in the longitudinal direction of the base and coupled to the wiper arm base and rotatably coupled to the second arm; A wiper blade attached to the wiper arm main body of the wiper arm and pressed against a wind screen; the idler shaft is located inside a locus drawn by a joint portion between the wiper arm main body and the second arm, and A wiper device disposed on the windscreen side. 2. The case according to claim 1, further comprising a case accommodating the driving gear and the driven gear, respectively, wherein the case is formed with an idler shaft support for rotatably supporting the idler shaft. Wiper device. 3. The wiper arm base includes a base head coupled to a pivot shaft and a rod protruding from the base head. The wiper arm main body includes a rod of the wiper arm base. The wiper device according to claim 2, wherein a rod insertion portion into which the second arm can be inserted is formed, and a second arm coupling portion to which the second arm is rotatably coupled is formed. .