JP2001151083A - Wiper pivot - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper pivot that offers reliable wiping action and undergoes no looseness between its pivot arm and pivot shaft. SOLUTION: This wiper pivot 1 comprises a pivot shaft 3 having a pivot arm fixing portion 3d with a first serrated face 3d3 near the tip projecting out from a pivot holder 2, and a pivot arm 7 having a shaft hole 7b with a second serrated face 7b3 designed for a substantially aligned fit with the first serrated face 3d3 of the pivot arm fixing portion 3d and having pressed/crimped portions 7b5 and 7b6 formed when the second serrated face 7b3 of the shaft hole 7b is crimped against the first serrated face 3d3 of the pivot arm fixing portion 3d after the pivot arm fixing portion 3d of the pivot shaft 3 is fitted in the shaft hole 7b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper pivot for wiping a wiper by the power of a wiper motor.

[0002]

2. Description of the Related Art As a wiper pivot for wiping a wiper by the power of a wiper motor, a pivot shaft is inserted into a shaft hole formed in the pivot holder, and a wiper arm is fixed to a tip end of the pivot shaft protruding from the pivot holder by a nut. It is known that a pivot arm is crimped and fixed to a base end of a pivot shaft protruding from a pivot holder.

[0003]

In the above-mentioned wiper pivot, since the distal end of the pivot shaft to which the wiper arm of the pivot shaft is fixed is separated from the base end of the pivot shaft to which the pivot arm is fixed, wiping is performed. During operation, the pivot shaft is likely to be twisted or bent, and if the pivot shaft is twisted or bent, there is a problem that the wiper may fluctuate. Further, since the load from the wiper side is transmitted to the pivot arm at a position distant via the pivot shaft, a large load is applied to the pivot arm, and as a result, the swaged portion between the pivot arm and the pivot shaft is loosened. There was a problem that there was a possibility.

[0004]

An object of the present invention is to provide a wiper pivot capable of performing a reliable wiping operation without causing a wiper wiping fluctuation, and having no looseness between a pivot arm and a pivot shaft. It is intended to be.

[0005]

Configuration of the Invention

[0006]

According to a first aspect of the present invention, there is provided a wiper pivot having a pivot shaft to which a wiper is attached at a distal end, a pivot holder rotatably supporting the pivot shaft, and a base end of the pivot shaft. A wiper pivot having a pivot arm coupled to the pivot portion, wherein the pivot shaft has a first end protruding from the pivot holder and a distance from the front end of the pivot shaft sufficiently small with respect to the entire length thereof. A pivot arm fixing part having a concave and convex surface is formed, wherein the pivot arm has a shaft hole having a second concave and convex surface fitted substantially coincident with the first concave and convex surface of the pivot arm fixing part; A structure in which after the pivot arm fixing portion of the shaft is fitted into the shaft hole, a crushed crimping portion is formed by pressing the second concave and convex surface of the shaft hole on the first concave and convex surface of the pivot arm fixing portion. It is characterized in that the.

According to a wiper pivot according to a second aspect of the present invention, in addition to the configuration of the first aspect, the first uneven surface of the pivot arm fixing portion of the pivot shaft has a sawtooth-shaped peak and a valley. A first serration portion continuous with the first serration portion, and a second concave-convex surface of the pivot hole of the pivot arm has a valley portion that is formed in an arc shape or a trapezoid shape and coincides with a peak portion of the first serration portion. The present invention is characterized in that a second serration portion is provided which is continuous with a peak portion corresponding to a valley portion of the first serration portion.

According to a wiper pivot according to a third aspect of the present invention, in addition to the structure of the first or second aspect, the crushing caulking portion includes a first crushing member disposed around the shaft hole on the upper surface of the pivot arm. The present invention is characterized in that a configuration is provided that includes a crimping portion and a second crushing crimping portion disposed around the shaft hole on the lower surface of the pivot arm.

In the wiper device according to a fourth aspect of the present invention, a wiper mounting portion to which a wiper is mounted is formed at a tip end portion of the pivot shaft main body, and the wiper mounting portion is located at a sufficiently small distance from the wiper mounting portion with respect to its entire length. And a pivot shaft having a pivot arm fixing portion having a first concave-convex surface formed in the vicinity thereof, and a wiper mounting portion and a pivot arm fixing portion of the pivot shaft can be arranged in a protruding manner so that the pivot shaft main body of the pivot shaft can be rotated. A pivot holder to be supported, a shaft hole having a second concave-convex surface which is fitted substantially coincident with the first concave-convex surface of the pivot-arm fixing portion of the pivot shaft, and fixing the pivot arm of the pivot shaft to the shaft hole After the part is inserted,
The present invention is characterized in that the pivot arm has a pivot arm formed with a crushed crimping portion formed by pressing a second uneven surface to the first uneven surface of the pivot arm fixing portion.

In the wiper device according to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, a pin groove is formed in the pivot shaft at a base end protruding from the pivot holder, so that the pivot arm and the pivot holder are connected to each other. A first gap member disposed therebetween, a pin fitted in a pin groove of the pivot shaft, and a second gap member disposed between the pin and the pivot holder. I have.

[0011]

In the wiper pivot according to the first, second, third, fourth, and fifth aspects of the present invention, the pivot arm has a sufficiently small distance from the tip of the pivot shaft to which the wiper is attached to the entire length of the pivot shaft. After the pivot arm fixing portion of the pivot shaft is fitted into the pivot hole fixing portion which is placed and placed, the second uneven surface of the shaft hole is fixed by the squashed crimping portion. It is caulked and fixed to the first uneven surface of the portion. Therefore, the distance from the wiper arm to the pivot arm is smaller than that of a conventional pivot shaft in which the distal end of the pivot shaft to which the wiper arm is fixed is separated from the base end of the pivot shaft to which the pivot arm is fixed. Since the size is reduced, twisting and bending of the pivot shaft hardly occur, and a large load is not applied to the pivot arm from the wiper side.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

[0013]

1 to 5 show one embodiment of a wiper pivot according to the present invention.

The illustrated wiper pivot 1 includes a pivot holder 2, a pivot shaft 3, a first gap member 4, a second gap member 5, a C-shaped pin 6, and a pivot arm 7.

In the pivot holder 2, a cylindrical body 2b is formed on a holder body 2a having a substantially triangular plate shape, and the cylindrical part 2b is provided with an upper end surface 2b1 and a lower end surface 2b.
A pivot shaft support hole 2c penetrating to b2 is formed.

On the holder body 2a, three bolts 8 (here, two of the three bolts are not shown) are protrudingly arranged.

The cylindrical portion 2b has a length L1, and two bearings 9, 10 are fitted into the pivot shaft support hole 2c.

In the pivot holder 2, the tip end side of the cylindrical portion 2b is inserted from below the vehicle body into a pivot hole provided in a dash upper panel (not shown), and three bolts 8 are also provided on the dash upper panel. After being inserted through the bolt hole from below the vehicle body, the nut is screwed into a bolt 8 protruding from the dash upper panel to be mounted on the vehicle body.

The pivot shaft 3 has a length L2 larger than the cylindrical portion 2b of the pivot holder 2, and the pivot shaft 3 has a pin groove 3b formed at the base end of a round rod-shaped pivot shaft main body 3a. A wiper mounting portion 3c is formed at the tip of the pivot shaft main body 3a.

The wiper mounting portion 3c is disposed between the tip of the pivot shaft 3 and the length L3. The wiper mounting portion 3c has a male thread 3c1 and a tapered serration 3c2. Have been. Wiper mounting part 3
As for c, a serration receiving portion of a pivot shaft fixing hole formed on a wiper arm (not shown) is crimped to the tapered serration portion 3c2, and a nut (not shown) is screwed into the male screw portion 3c1, thereby being connected to the wiper arm.

A pivot arm fixing portion 3d is formed near the wiper mounting portion 3c of the pivot shaft main body 3a. The pivot arm fixing portion 3d has a width dimension L5 centered on a position of a length dimension L4 from the tip of the pivot shaft 3. The length L4 of the pivot arm fixing portion 3d from the tip of the pivot shaft 3 is sufficiently smaller than the total length L2 of the pivot shaft 3.

The pivot arm fixing portion 3d has:
As shown in FIG. 4, a sawtooth-shaped peak 3d1 protruding from the outer periphery of the pivot shaft main body 3a toward the outside of the pivot arm fixing portion 3d, and on the other hand, at the center of the pivot shaft main body 3a. A first serrated portion 3d4 having a first concave-convex surface 3d3 in which sawtooth-shaped valley portions 3d2 which are recessed toward and are arranged alternately and continuously is formed all around.

In the pivot arm 7, a shaft hole 7b is formed at the base end of a pivot arm body 7a formed in a rectangular plate shape, and a ball pin 11 is attached to a lower surface 7a2 of a tip end of the pivot arm body 7a. I have. A link connecting rod (not shown) is connected to the ball pin 11 via a spherical pair.

As shown in FIG. 4, the pivot arm fixing portion 3d of the pivot shaft 3 is fitted into the shaft hole 7b, thereby protruding toward the center of the shaft hole 7b. The first formed on the fixing portion 3d
And an arc-shaped peak 7b1 proximate to the valley 3d2 of the uneven surface 3d3, and, on the contrary, a first portion formed on the pivot arm fixing portion 3d of the pivot shaft 3 protruding toward the outside of the shaft hole 7b. The second serration portion 7b4 having the second uneven surface 7b3 in which the arc-shaped valley portion 7b2 adjacent to the peak 3d1 of the uneven surface 3d3 is alternately and continuously arranged.
Are formed. At this time, between the valley 3d2 of the first uneven surface 3d3 and the peak 7b1 of the second uneven surface 7b3, and between the peak 3d1 of the first uneven surface 3d3 and the second uneven surface 7d3.
a space 1 having a small volume between the valley 7b2 of b3
There are two. In this case, the peaks 7b1 and the valleys 7b2 of the illustrated second uneven surface 7b3 are trapezoidal.
The shape is not limited to a trapezoid, and may be an arc shape.

On the outer peripheral portion of the shaft hole 7b, a first crushed crimping portion 7b5 is formed on the upper surface 7a1 of the pivot arm body 7a.
Are formed, and a second crushed crimping portion 7b6 is formed on the lower surface 7a2 of the pivot arm body 7a.

In the first stage of the assembly shown in FIG. 4, the first crushed caulking portion 7b5 is fitted into the shaft hole 7b of the pivot arm 7 with the wiper mounting portion 3c first. The first serration 7b2 of the shaft hole 7b and the first arm 3d of the pivot arm 3
After the serrations 3d4 are engaged with each other, the pivot arm main body 7a is moved in the second stage of the assembly shown in FIG.
By pressing a first caulking jig (not shown) from the upper surface 7a1 to the lower surface 7a2, the pivot arm body 7a is formed in an annular concave shape on the upper surface 7a1 outside the shaft hole 7b.

The second crushed crimped portion 7b6 is formed at the same time as the first crushed crimped portion 7b5 is formed, and extends from the lower surface 7a2 of the pivot arm body 7a to the upper surface 7a1 (not shown). By pressing the crimping jig, the lower surface 7a2 of the pivot arm body 7a is formed in an annular concave shape outside the shaft hole 7b.

The first crushed crimping portion 7b5 and the second crushed crimping portion 7b6 are formed by fixing the second serration portion 7b4 formed in the shaft hole 7b to the pivot arm fixing portion 3d of the pivot shaft 3.
The space portion 12 is formed in the first serration portion 3d4 formed in
Has the function of eliminating and bonding.

As shown in FIG. 5, the ridges 7 of the second serrations 7b4 formed in the shaft hole 7b of the pivot arm 7 by the first and second crushing crimping portions 7b5, 7b6.
b1 is pressed against the valley 3d2 of the first serration 3d4 formed on the pivot arm fixing portion 3d of the pivot shaft 3, and the valley 7b2 of the second serration 7b4 of the pivot arm 7 is Crest portion 3d of first serration portion 3d4 of pivot arm fixing portion 3d
Since the pivot arm 7 is connected to the pivot shaft 3 by being press-bonded to 1, a high fastening force can be obtained. At this time, as shown in FIG. 5, the length dimension L6 from the outer edge of the first and second crushed crimping portions 7b5, 7b6 to the outer edge of the pivot arm 7 is the pivot arm shown in FIG. Almost twice the width t1 of the main body 7a is selected. The volume crushed by the first and second crushing crimping portions 7b5 and 7b6 is about twice to about 4 times the volume of the space portion 12.
Double is chosen. The hardness of the pivot shaft 3 is selected to be higher than the hardness of the pivot arm 7.

The first gap member 4 is composed of a pivot arm 7 connected to the pivot shaft 3 and the cylindrical portion 2b of the pivot holder 2.
It is located between. This first gap member 4
Is that the lower surface 7a2 of the pivot arm 7 is
Has a function of preventing direct sliding contact with the upper end surface 2b1 of the cylindrical portion 2b formed at the bottom.

The second gap member 5 is arranged between the lower end surface 2 b 2 of the cylindrical portion 2 b formed on the pivot holder 2 and the sea-shaped pin 6. The second gap member 5 has a function of preventing the sea-shaped pin 6 from directly slidingly contacting the lower end surface 2b2 of the cylindrical portion 2b formed on the pivot holder 2.

The sea (C) type pin 6 is connected to the pivot holder 2
Of the pivot shaft 3 projecting downward from the lower end surface 2b2 of the pivot shaft 3b. Since this sea-shaped pin 6 has an outer diameter dimension larger than the inner diameter dimension of the pivot shaft support hole 2c of the pivot holder 2, even if a force from the base end to the tip end of the pivot shaft 3 is applied, the second pin 6 Has a function of preventing the pivot shaft 3 from dropping out of the pivot holder 2 by colliding with the gap member 5.

As described above, since the wiper pivot 1 has the pivot arm 7 connected to the pivot arm fixing portion 3d located at a position close to the wiper mounting portion 3c of the pivot shaft 3, the wiper pivot 1 is provided from the wiper arm to the pivot arm 7. , The torsion and bending of the pivot shaft 3 do not occur.

After the pivot arm fixing portion 3d, which is arranged at a position close to the wiper mounting portion 3c of the pivot shaft 3, is fitted into the shaft hole 7b of the pivot arm 7, the first and second squeezing and crimping are performed. By the parts 7b5 and 7b6, the second hole of the shaft hole 7b is formed.
Is fixed by caulking to the first uneven surface 3d3 of the pivot arm fixing portion 3d having a shape similar to the second uneven surface 7b3, so that the distance from the wiper arm to the pivot arm 7 is reduced. By becoming smaller,
Since a large load is not applied to the pivot arm 7 from the wiper arm side and a large meshing height is obtained between the two, the pivot arm 7 is fixed to the pivot shaft 3 with a large crimping force for a long time.

In the illustrated embodiment, the first crushed crimped portion 7b5 and the second crushed crimped portion 7b6 are formed as a pair on the pivot arm body 7a of the pivot arm 7. However, the first crushed crimped portion 7b5 or the second crushed crimped portion 7b6 may be formed alone on the pivot arm body 7a.

[0036]

As described above, according to the wiper pivot according to the first, second, third, fourth, and fifth aspects of the present invention, the pivot arm is pivoted from a position near the tip of the pivot shaft where the wiper is mounted. It is fixed to a pivot arm fixing part arranged at a sufficiently small distance with respect to the entire length of the shaft, and after the pivot arm fixing part of the pivot shaft is fitted in the shaft hole, the squeezing crimping part makes the shaft hole The second uneven surface is swaged and fixed to the first uneven surface of the pivot arm fixing portion. Therefore, the distance from the wiper arm to the pivot arm is smaller than that of a conventional pivot shaft in which the distal end of the pivot shaft to which the wiper arm is fixed is separated from the base end of the pivot shaft to which the pivot arm is fixed. Since the size is reduced, twisting and bending of the pivot shaft hardly occur, and a large load is not applied to the pivot arm from the wiper side. Therefore, there is an excellent effect that the wiping operation can be reliably performed without causing the wiping fluctuation of the wiper, and the pivot arm and the pivot shaft are not loosened.

[Brief description of the drawings]

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

FIG. 2 is an external perspective view illustrating an assembling relationship between a pivot arm and a pivot shaft in the wiper pivot shown in FIG. 1;

3 is a partially broken external perspective view illustrating an assembling relationship between a pivot arm and a pivot shaft in the wiper pivot shown in FIG. 1;

4 is a cross-sectional view of the wiper pivot shown in FIG. 1 in a state where a pivot arm and a pivot shaft are assembled in a first stage;

5 is a cross-sectional view of the wiper pivot shown in FIG. 1 in a state where a pivot arm and a pivot shaft are assembled in a second stage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wiper pivot 2 Pivot holder 3 Pivot shaft 3a Pivot shaft main body 3b Pin groove 3c Wiper mounting part 3d Pivot arm fixing part 3d1 Crest part 3d2 Valley part 3d3 First uneven surface 3d4 First serration part 4 First gap member 5 Second gap member 6 (Pin) Sea (C) -shaped pin 7 Pivot arm 7b Shaft hole 7b1 Crest portion 7b2 Valley portion 7b3 Second uneven surface 7b4 Second serration portion 7b5 (Fulsion caulking portion) First Crushed crimping part 7b6 (Fulsion crimped part) Second crushed crimped part

Claims (5)

[Claims] 1. A wiper pivot comprising: a pivot shaft to which a wiper is attached at a distal end portion; a pivot holder rotatably supporting the pivot shaft; and a pivot arm coupled to a base end portion of the pivot shaft. In the pivot shaft, a pivot arm fixing portion having a first concave-convex surface is formed at a position close to the distal end protruding from the pivot holder and at a distance sufficiently smaller than the entire length from the distal end of the pivot shaft. The pivot arm has a shaft hole having a second concave and convex surface which is fitted substantially coincident with the first concave and convex surface of the pivot arm fixing portion, and the pivot arm fixing portion of the pivot shaft has a shaft hole. A wiper pivot, wherein after being fitted, a squeezed caulked portion in which the second uneven surface of the shaft hole is crimped is formed on the first uneven surface of the pivot arm fixing portion. 2. A first serration portion comprising a sawtooth-shaped peak and valley is provided on a first concave-convex surface of a pivot arm fixing portion of a pivot shaft. The second concave / convex surface of the hole has an arc shape or a trapezoidal shape, and is formed of a valley corresponding to the valley of the first serration and a valley corresponding to the valley of the first serration. The wiper pivot according to claim 1, further comprising a second serration portion. 3. The crimping portion includes a first crimping portion disposed around the shaft hole on the upper surface of the pivot arm, and a first crimping portion disposed around the shaft hole on the lower surface of the pivot arm. 2. A squeezed caulking portion is provided.
Or the wiper pivot according to 2. 4. A wiper mounting portion to which a wiper is mounted is formed at a tip end portion of the pivot shaft main body, and a first concave-convex surface is provided near the wiper mounting portion at a distance sufficiently short from the wiper mounting portion with respect to the entire length thereof. A pivot shaft on which a pivot arm fixing portion is formed; a pivot holder for rotatably supporting a pivot shaft main body of the pivot shaft by allowing a wiper mounting portion and a pivot arm fixing portion of the pivot shaft to be protrudingly arranged; A shaft hole having a second concave-convex surface which is fitted substantially coincident with the first concave-convex surface of the pivot-arm fixing portion of the pivot shaft, and after the pivot-arm fixing portion of the pivot shaft is fitted into the shaft hole. A wiper pivot, comprising: a pivoting arm formed with a crushed caulking portion formed by pressing a second irregularity surface to a first irregularity surface of the pivot arm fixing portion. 5. A pivot shaft having a pin groove formed at a base end protruding from the pivot holder, a first gap member disposed between the pivot arm and the pivot holder, and a pin groove of the pivot shaft. And a second pin disposed between the pin and the pivot holder.
The wiper pivot according to claim 4, further comprising: