JPS6294456A - Wiper device - Google Patents

Abstract

PURPOSE:To enable wiper arm tip to draw elliptical locus and enlarge a wiping area by using a link mechanism wherein the ends of two links with other ends supported on fixed side are connected to each other via a tertiary link in a crossing condition. CONSTITUTION:Each one end of primary and secondary links 1 and 2 is so connected to both ends of a fixed bracket 6 as to be freely rotatable via pivots P1 and P2, and the other ends of said links 1 and 2 in a crossing condition are so connected to each other as to be freely rotatable through a tertiary link 3 via pivots P3 and P4. At the intermediate part of the tertiary link 3, a wiper arm 4 is provided as connected to a pivot P5 and a drive rod 5 is so connected to the pivot P5 as to be freely rotatable. And the drive rod 5 is caused to give reciprocating motion through a drive mechanism including a motor, thereby making the moving locus 'C' of the pivot 5 elliptical and causing the tip of the wiper arm 4 to draw elliptical locus 'A'.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiper device for automobiles and the like, and particularly to a wiper device with one blade.

Week] U1 Hina Generally, when wiping the windshield of a car with a single-blade wiper device, the center of rotation of the wiper arm is fixed, especially in the case of a windshield whose vertical width is relatively large compared to its width. If the wiper arm is moved along a simple circular path, it will not be possible to obtain a sufficient wiping range to ensure sufficient visibility.

Therefore, conventionally, as a means of increasing the range of wiping the windshield surface with one blade, a wiper arm extension mechanism is provided to allow the wiper arm to extend and contract during the wiping operation.

However, in such a device, in addition to the wiper arm drive mechanism, a mechanism for extending and retracting the wiper arm in synchronization with the wiping operation of the wiper is required, making the overall structure of the wiper device complicated.

Another method is to use a planetary gear mechanism to move the rotation center of the wiper arm during the wiper wiping operation, without fixing the rotation center of the wiper arm, so that the wiper arm draws an elliptical orbit. A wiper device has been developed.

However, even this type of wiper device requires a planetary gear mechanism with a complicated structure, which complicates the structure of the wiper device, and also causes problems such as rattling caused by assembly errors or wear of the gears.

The present invention has been made in consideration of the above points, and has a simple configuration in which the center of rotation of the wiper arm is moved as the wiper wipes. To provide a wiper device capable of effectively expanding the wiping range of a surface.

In order to achieve the object, the present invention uses a link mechanism to move the center of rotation of the wiper arm in accordance with the wiping operation of the wiper.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the basic configuration of a wiper device according to the present invention, in which first and second links are respectively attached to be movable together via pivots PI and P2 provided at both ends of a fixing bracket 6. 1 and 2, and the first and second links 1 and 2 are alternately connected.
Link 1.・Each other end of 2 is pivot hP3. P4
a third link 3 that is movably attached via the
Pivot P3 in the third link 3. The wiper arm 4 is constructed of a wiper arm 4 fixedly attached to a pivot P5 provided at an intermediate point of the wiper arm P4, and a driving rod 5 movably attached to the pivot P5.

In addition, the pivots PL and P2 in the bracket 6 are set so that they are parallel to the lateral direction of the freon 1-glass, and the lengths of the first link 1 and the second link 2 are set to be the same. There is. Further, the drive rod 5 is moved in the direction shown by the arrow in the figure by a drive mechanism (not shown) using a motor as a drive source, and pushes or pulls the third link 3 via the pivots 1 to P5. It looks like this. Further, a wiper blade for wiping the windshield surface is movably attached to the tip of the wiper arm 4.

In the wiper device according to the present invention configured in this way,
When the wiper is pulled to the maximum by the driving rod 5 during wiper operation, the first. Second. The third links 1, 2.3 are in the state shown in FIG. 1(,), and the wiper arm 4 is positioned at the right position (stop position). Moreover, when pushed to the maximum by the driving rod 5, the first. Second. Third
The state of each link 1, 2.3 becomes as shown in FIG. 1(c), and the wiper arm 4 is positioned at the left inverted position. FIG. 1(b) shows the wiper arm 4 in the central position.

At this time, the movement trajectory of the pivot l-P 5 in the third link 3 to which the wiper arm 4 is attached becomes elliptical, so that the tip of the wiper arm 4 draws an elliptical trajectory A as shown in FIG. become. A perfect circular trajectory B shown by a dotted line in the figure shows a trajectory drawn by the tip of the wiper arm when the wiper arm is driven with the pivot of the wiper arm fixed as in the conventional case. Note that the curve indicated by C in the figure indicates the movement locus of the pivot P5 in the third link 3.

Therefore, when the wiper wipes the windshield surface with the same width, compared to a case where the rotation center of the wiper arm is fixed, the wiper according to the present invention can greatly increase the wiping range of the windshield surface. It becomes like this. In this case, it is especially advantageous when wiping a windshield surface whose vertical width is larger than its horizontal width.

Normally, wiper devices with one blade are set so that the wiping angle of the wiper arm is larger than those with two blades, so if the wiper arm is driven via a link mechanism, There is a high possibility that the wiper arm will rotate beyond its inverted position.

However, according to the present invention, the first link 1 and the second link
The links 2 and 2 are alternately arranged to prevent the wiper arm 4 from rotating beyond the inverted position.

In addition, in FIG. 1, the third link 3 is
Instead, the driving rod 5 is used to transmit the driving force to the first link 1 or the second link 2.
It is also possible to transmit the driving force to.

When such a wiper device is installed facing the windshield of a car, the wiper arm 4 and the first. Although the second link 1゜2 and the fixed bracket 1-6 will be exposed outside the vehicle body,
In reality, the wiper arm 4 is bent three-dimensionally, for example, by 45 degrees according to the inclination of the windshield surface at the part a in FIG. If you make contact with
The portion consisting of the first to third links 1, 2.3 and the fixing bracket 5 can be housed inside the vehicle body.

FIG. 3 shows a specific example of the structure of the link mechanism in the wiper device according to the present invention described above, and here, the first to third links 1 to 3 do not come into contact with each other during wiper operation. The link mechanism is structured three-dimensionally.

Further, FIG. 4(a) shows a plan view of the link mechanism, and FIG. 4(b) shows a front view thereof.

In the figure, 7 indicates a mounting shaft of the wiper arm 4 fixedly provided on the third link 3 side, and 8 indicates a bearing to which the tip of the driving rod 5 is movably mounted.

Furthermore, as shown in FIG. 4(a), the first link 1 and the second link 2 are bent in directions facing each other to increase the amount of movement of the third link 3. , the wiper arm 4 can have a large wiping angle.

In the embodiments described above, the area to be wiped in the vertical direction of the windshield surface is increased, but if the link configuration shown in FIG. 5 is adopted, the wipe area in the horizontal direction of the windshield surface is The wiping area can be increased.

As described above, the wiper device according to the present invention uses a link mechanism to move the center of rotation of the wiper arm along an elliptical trajectory as the wiper wipes, and has a simple configuration with one blade. It has the excellent advantage of effectively expanding the range of wiping of the windshield surface.

[Brief explanation of drawings]

FIGS. 1(a), (b), and (c) are plan views showing the operating states of the basic configuration of the wiper device according to the present invention, respectively;
FIG. 2 is a diagram showing the movement locus of the wiper arm tip in the same embodiment, FIG. 3 is a perspective view showing the specific configuration of the link mechanism in the same embodiment, and FIGS. 4(a) and (b) are A plan view and a front view of the link mechanism portion, and FIG. 5 is a plan view showing another link configuration of the wiper device according to the present invention. =8- 1.2,3...Link 4...Wiper arm 5
...Drive rod 5...Fixing bracket P1~
P5...Pivot

Claims (1)

[Claims] The first end is movably attached to the fixed side, respectively.
and a second link, a third link to which the other ends of the first and second links are rotatably attached so that the first and second links alternate; A wiper device consisting of a rod that transmits driving force from a motor to one of the rods, and a wiper arm attached to a third link.