JPH0618117U - Vehicle wiper device - Google Patents

Abstract

(57) [Summary] [Object] To provide a simple wiper device having a configuration capable of obtaining a constant blade pressure regardless of the curvature of glass. [Structure] A shaft 3 is rotatably inserted into a pivot holder 2 fixed to a vehicle body side. A retainer 6 having a wiper blade attached to its tip is coupled to the tip of the shaft 3 via a head 5. A spring 8 whose tip is locked to the retainer 6 is provided. A cam 9 that is eccentric to the rotation axis of the shaft 3 is fixed to the outer peripheral surface of the tip end of the pivot holder 2. Cam 9
The base end of the spring 8 is engaged with and held on the outer peripheral surface of the rotatably. [Operation] According to the rotation phase of the shaft 3, the spring 8
Is expanded and contracted to change the urging force on the retainer 6.
Therefore, since the pressing force applied to the blade can be automatically and optimally controlled to obtain a constant blade pressure,
The uneven wiping seen on curved glass is eliminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wiper device for wiping a glass covering a front window or a rear window of a vehicle.

[0002]

[Prior art]

 In recent years, curved glass is often used in automobiles from the viewpoint of reducing air resistance and improving habitability or appearance. However, if dirt on the surface of such curved glass is wiped with a swing-type wiper device, it is possible to eliminate uneven wiping unless the pressing force of the wiper blade is changed according to the curvature of the glass. Can not.

In order to eliminate such uneven wiping, for example, as disclosed in Japanese Utility Model Laid-Open No. 1-112157, a blade pressure rotatably attached to the outer peripheral surface of the tip of the pivot holder with the engaging portion eccentric It seems to be effective to adopt a variable system.

However, such a conventional wiper arm pressure variable system does not change the blade pressure in response to the curvature of the glass, but changes the rotation phase of the engaging portion in response to the vehicle speed. As a result, the pressing force of the wiper blade is changed to avoid high-speed floating of the wiper blade, and thus there is a problem that uneven wiping caused by the curvature of the glass cannot be eliminated.

[0005]

[Problems to be solved by the device]

 The present invention has been made in view of the above circumstances, and has a configuration in which a constant blade pressure can be obtained by optimally changing the pressing force applied to the blade in response to the curvature of the glass, that is, the position of the wiper blade. It is an object to provide a simple wiper device.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention rotatably inserts a shaft into a pivot holder fixed to the vehicle body side, and a retainer having a wiper blade attached to the tip thereof is connected to the tip of the shaft via a head. At the same time, a spring whose tip is locked to the retainer is provided. Then, a cam that is eccentric to the rotation axis of the shaft is fixed to the outer peripheral surface of the tip of the pivot holder, and the proximal end of the spring is relatively rotatably engaged and held to the outer peripheral surface of the cam. Is characterized by.

[0007]

[Action]

 When the shaft rotates, the retainer rotates via the head, and the wiper blade moves along the surface of the glass to wipe the retainer. Also, since the spring rotates together with the retainer as the shaft rotates, the base end of the spring rotates with respect to the cam. When the spring rotates with respect to the cam in this manner, the spring expands and contracts to change the biasing force applied to the retainer, so that the pressing force applied to the blade changes.

Therefore, if the cam is set so that the crest of the cam supports the base end of the spring in the direction opposite to the direction of the retainer in the region where the blade is in contact with the position where the glass has a small curvature, the curved surface can be Even with glass, a constant blade pressure can be obtained, and uneven wiping is eliminated.

[0009]

【Example】

 Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a sectional view showing an embodiment of a vehicle wiper device according to the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is another embodiment of a vehicle wiper device according to the present invention. FIG.

In these drawings, a hollow pivot holder 2 is fixed to a ventilator louver 1 provided as a vehicle body side member. A head 4 is tightened and fixed by using a nut 4 at the tip of a shaft 3 which is rotatably inserted and held in a pivot holder 2.

Further, the base end of a retainer 6 having a wiper blade (not shown) attached to the tip and the head 5 are pivotally connected via a pin 7. Then, the base end of the spring 8 whose tip is engaged with the vicinity of the tip of the retainer 6 is rotatably engaged with and held by the outer peripheral surface of the tip of the pivot holder 2.

Therefore, when the shaft 3 rotates, the retainer 6 integrally rotates via the head 5 and the shaft 7. Then, the wiper blade attached to the tip of the retainer 6 receives the pressing force of the spring 8 and is pressed against the surface of the glass (not shown) to reciprocate.

In the embodiment shown in FIGS. 1 and 2, a cam 9 which is eccentric with respect to the rotation axis of the shaft 2 is integrally formed on the outer peripheral surface of the tip of the pivot holder 2 so that the cam 9 rotates. The base end of the spring 8 is engaged and held by the plate 10 which is freely engaged and held. Reference numeral 11 is a link for rotationally driving the shaft 3.

In the wiper device configured as described above, when the shaft 3 is rotated by the link 11, the retainer 6 is rotated via the head 5, and accordingly, the wiper blade moves along the surface of the glass. Move and wipe it. Further, since the spring 8 and the plate 10 rotate together with the retainer 6 as the shaft 3 rotates, the plate 10 rotates with respect to the cam 9.

When the plate 10 rotates with respect to the cam 9 in this manner, the pressing force applied to the blade changes in order to expand / contract the spring 8 and change the urging force on the retainer 6. Therefore, if the cam 9 is set so that the crest portion of the cam 9 projects in the direction opposite to the direction of the retainer 6 to support the plate 10 in the region where the blade is in contact with the position where the curvature of the glass is small, the curved glass Even with this, a constant blade pressure can be obtained and uneven wiping is eliminated.

In the above embodiment, the plate 10 is used to engage the base end of the spring 8 with the cam 9 to reduce the rotation resistance. However, as in the embodiment shown in FIG. It is also possible to reduce the number of parts by directly engaging the hook 12 provided at the base end of the cam 9 with the cam 9. Further, in the embodiment, the cam 9 is integrally formed on the tip outer peripheral surface of the pivot holder 2, but a cam prepared as a separate member may be fixed to the tip outer peripheral surface of the pivot holder.

[0017]

[Effect of device]

 As is clear from the above description, according to the wiper device of the present invention, it is possible to eliminate the uneven wiping caused by the change in curvature only by presetting the direction and height of the cam in response to the curvature of the glass. it can. Further, since the intended purpose can be achieved only by providing the cam on the outer peripheral surface of the tip of the pivot holder, there are few failures and the increase in cost can be suppressed.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view corresponding to the AA cross section of FIG. 1 showing another embodiment of the vehicle wiper device according to the present invention.

[Explanation of symbols]

 1 Ventilator louver 2 Pivot holder 3 Shaft 4 Nut 5 Head 6 Retainer 7 Pin 8 Spring 9 Cam 10 Plate 11 Link 12 Hook

Claims (1)

[Scope of utility model registration request] 1. A pivot holder fixed to a vehicle body side, a shaft rotatably inserted in the holder, a retainer having a wiper blade attached to a tip thereof, a head for connecting the retainer to a tip of the shaft, and a tip. In a vehicle wiper device including a spring locked to the retainer, a cam that is eccentric with respect to the rotation axis of the shaft is fixed to a tip outer peripheral surface of the pivot holder, and the spring is provided on the outer peripheral surface of the cam. A wiper device for a vehicle, wherein the base end of the wiper device is engaged and held so as to be relatively rotatable.