JP2780468B2 - Wiper device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper device for wiping a front window panel of an automobile, and more particularly to a wiper device having a mechanism for relaxing a spring force of a wiper arm when a wiper blade is turned over. is there.

(Prior Art) Conventionally, as this kind, there is, for example, one shown in FIGS.

In FIG. 4, reference numeral 1 denotes a wiper arm. The wiper arm 1 has an arm head 2 attached to a pivot shaft 5 near a lower edge of a front window panel 4, and a rear end 6 of the arm head 2 having a rotation shaft 9 attached thereto. And a retainer rotatably connected to the retainer, and the retainer supports a wiper blade via an arm piece.

As shown in FIG. 5, a rod 11 having a hook 10 at a rear end is rotatably supported by a center support 12 and a tip support 13 on the arm head 2. The rotating piece 14 is attached to the part so as to be able to rotate integrally with the rod 11.

Then, the hook 15 is fixed to the rotating end of the rotating piece 14,
One end of a spring 16 is connected to the hook 15 and the other end is connected to the arm piece 7, and the spring 16 is disposed in the length direction of the retainer 3. The spring 16 urges the wiper blade 16 toward the front window panel 4.

With this configuration, when the wiper arm 1 reaches the wiper blade 8 reverse position, the hook 10 collides with the projection 17 provided on the vehicle body side to rotate the rod 11 and the rotating piece 14,
By loosening the spring force of the spring 16, the wiper blade 8
To reduce the reverse sound and the like.

Incidentally, as a device having such a structure, for example,
There is the one described in Japanese Patent No. 80958.

(Problems to be Solved by the Invention) However, in such a conventional device, when the wiper blade 8 is turned over, the hook 10 of the wiper arm 1 collides with the projection 17 on the vehicle body side to loosen the spring force of the spring 16. As a result, there is a problem that noise due to the collision sound between the hook 10 and the projection 17 is generated, which is not preferable in a vehicle interior environment.

Accordingly, it is an object of the present invention to reduce the noise when the wiper blade is inverted and to improve the interior environment of the vehicle.

(Means for Solving the Problems) The present invention has been made in view of such problems in the related art, and a rear end portion of a retainer is rotatably connected to an arm head, and an end portion of the arm head on the retainer side. A pivot piece is rotatably mounted around the axis in the retainer length direction, one end of the spring is connected to the pivot end of the pivot piece, and the other end of the spring is attached to the retainer. In the wiper device connected to the tip end side, a first piece is attached to the rotating piece.
A second gear meshing with the first gear and a third gear interlocking with the second gear are provided on the arm head, and a rack meshing with the third gear is provided on the vehicle body side. And the gear shape of the first and second gears is
The wiper device is characterized in that the rotation speed of the first gear is set to be high when the wiper arm is inverted.

(Operation) According to this means, the third gear meshes with the rack on the vehicle body side and rotates with the rotation operation of the wiper arm, and the rotation of the second gear cooperates with the third gear. First
Will rotate.

At this time, since the first gear slows down its rotation at the time of the wiping operation of the wiper arm, the turning speed of the turning piece also slows down together with the first gear. Therefore, the rotating piece hardly acts on the spring, and the spring force of the spring is kept substantially constant.

In addition, when the wiper arm is turned over, the rotation of the first gear is increased, so that the rotating piece rotates quickly and the spring force of the spring is relaxed, so that the wiper arm is smoothly turned over. Become.

As described above, since the rotating piece is rotated by the rotation of the first, second, and third gears and the spring force of the spring is reduced, no noise is generated when the wiper arm is inverted, and the indoor environment is improved. It is planned.

(Examples) Hereinafter, the present invention will be described based on examples.

1 to 3 (a) and 3 (b) are views showing an embodiment of the present invention.

1 and 2, reference numeral 21 denotes a wiper arm. The wiper arm 21 includes an arm head 22 and a retainer 25 connected to the arm head 22 and supporting a wiper blade 24 via an arm piece 23 at a distal end. And is fixed to a pivot shaft 27 at a front position on the front window panel 26.

Specifically, a pivot shaft 27 is provided near the lower edge of the front window panel 26, and a rear end portion 28 of the arm head 22 is fixed to the pivot shaft 27. A rear end 45 of the retainer is rotatably connected via the shaft 30.

As shown in FIG. 1, the arm head 22 is provided with a mechanism 31 for relaxing the spring force.

More specifically, the rack 32 having an arc shape in the wiping range of the wiper arm 21 is attached to the front window panel 26 of the pivot shaft 27.
A pinion gear 33 which is provided near the side (see FIG. 2) and meshes with the rack 32 and rotates by a half on the rack 32 is provided.
The rotary support 34 is supported and attached to the rear end of the rod 35.

And, at the tip of the rod 35, an elliptical gear as a second gear
An elliptical gear 37 as a first gear meshing with the elliptical gear 36 is fixed to the center of the wiper arm 21 by a rotating support 38.
The center is fixed to the rear end of the rod 39 supported in the length direction. The mesh between these elliptical gears 36 and 37 is
When 21 reaches the approximate center position of the front window panel 26 wiping area (solid line position in FIGS. 1 and 2), the short diameter portion of the elliptical gear 36 and the long diameter portion of the elliptical gear 37 mesh with each other,
When the reversing position is reached (the position shown by the two-dot chain line in FIGS. 1 and 2), the long diameter portion of the elliptical gear 36 and the short diameter portion of the elliptical gear 37 are set to mesh with each other.

Then, a turning piece 40 facing the back side of the arm head 22 is attached to the distal end of the rod 39 along the minor diameter direction of the elliptical gear 37, and a hook 42 is fixed to a turning end 41 of the turning piece 40,
Through this hook part 42, the rotating piece 40 is
, And is connected to one end 44 of a spring 43 disposed along the length direction of the retainer 25.

Next, the operation of the wiper device having such a configuration will be described.

The wiper arm 21 is rotated by the driving rotation of the pivot shaft 27, and the wiper blade 24 wipes the surface of the front window panel 26. With this wiping operation, the pinion gear 33 rotates on the rack 32, so that the pinion gear 33
, The elliptical gears 36 and 37 are driven to rotate.

In the wiping region or the non-inverted position at this time the wiper arm 21, as shown in FIG. 3 (a), oval gear 36 is rotated in a range of short diameter region angle theta _2, oval gear Correspondingly
For 37 rotates in a range of major diameter region angle theta _1, with the majority of the wiping region, elliptical gear 37 is to rotate slower. As a result, the tilt angle of the rotating piece 40 in the wiping area is extremely small, and the rotating action of the hook 42 of the rotating end 41 on the spring 43 hardly occurs. As a result, the spring force of the spring 43 is kept substantially constant, and the wiper blade 24 comes into contact with the front window panel 26 with a predetermined pressing force.

On the other hand, when the wiper arm 21 approaches the reversing position (the position indicated by the two-dot chain line in FIGS. 1 and 2), as shown in FIG. 3B, the elliptical gear 36 rotates within the range of the major axis region angle θ ₂ ′. And
In response to this, the elliptical gear 37 rotates within the range of the minor-diameter region angle θ ₁ ′.
37 will rotate very fast. As a result, the rotating piece
Since the 40 is suddenly turned down and is almost right at the reversal position, the hook
42 rotates the one end 44 of the spring 43 toward the inside of the retainer 25, so that the panel force of the spring 43 is remarkably relaxed. Accordingly, when the wiper arm 21 is turned over, the pressing force of the wiper blade 24 against the front window panel 26 is reduced, so that the wiper blade 24 is smoothly turned over and the reversal sound is reduced. .

As described above, since the spring force of the spring 43 at the time of reversing the wiper arm 21 is reduced by the spring relaxing mechanism 31, the noise at the time of reversal is reduced, and the environment in the vehicle compartment can be improved.

In this embodiment, the elliptical gears 36 and 37 are configured to rotate around the center. However, the configuration is not limited to this, and the elliptical gears may be configured to rotate at the focal point of the ellipse. Although it is set so that the rotating piece 40 is right beside,
The present invention is not limited to this, and it is a matter of course that the spring force of the spring 43 can be reduced so that the rotating piece 40 is turned down by a predetermined angle at the reverse position.

(Effects of the Invention) As described above, according to the present invention, the first and second gears interlocked with the third gear meshing with the rack on the vehicle body side.
Since the rotating piece is rotated at a predetermined speed by the gears described above, there is a practically useful effect that the noise when the wiper arm is inverted is small and the environment in the vehicle interior can be improved.

[Brief description of the drawings]

1 to 3 (a) and (b) are views showing an embodiment of a wiper device according to the present invention. FIG. 1 is a diagram showing the appearance of the wiper device as viewed from the rear side of the vehicle body, and FIG. Fig. 3 (a) is a schematic front view showing the same device, Fig. 3 (a) is a schematic explanatory view showing the meshing state of the first and second gears and the angular relationship between the rotating pieces during wiping, and Fig. 3 (b) is a reverse view FIG. 4 is a schematic explanatory view showing the meshing state of the first and second gears and the angular relationship of the rotating piece in FIG. 4 and 5 show a conventional wiper device.
FIG. 5 is a diagram showing an appearance of the device, and FIG. 5 is a diagram showing a main part of the device as viewed from the rear side of the vehicle body. 21 Wiper arm 22 Arm head 25 Retainer 29 Tip (end of arm head on retainer side) 30 Rotating shaft 32 Rack 33 Circular gear (third gear) 36 ... elliptical gear (second gear) 37 ... elliptical gear (first gear) 40 ... rotating piece 41 ... rotating end 43 ... spring 44 ... one end 45 ... rear end

Claims (1)

(57) [Claims] 1. A retainer rear end is rotatably connected to an arm head, and a pivotal piece is attached to an end of the arm head on a retainer side so as to be rotatable around an axis in a retainer length direction. In a wiper device, one end of the spring is connected to a rotation end of the rotation piece, and the other end of the spring is connected to a tip end of a retainer. A second gear meshing with the first gear and a third gear interlocking with the second gear are provided on the arm head, and a rack meshing with the third gear is provided on the vehicle body side. The wiper device is characterized in that the gear shapes of the first and second gears are set such that the rotation speed of the first gear increases when the wiper arm is inverted.