JPS6274751A - Wiper device for vehicle - Google Patents

Abstract

PURPOSE:To enlarge the wiping area by folding an auxiliary arm and a wiper arm in a range within specific angle from the opposite rotary ends while stretching both arms straight in the central portion except said range. CONSTITUTION:This wiper device comprises an auxiliary arm 4 having one end supported rotatably on a gear box 3 coupled through a link mechanism 2 to a drive motor 1 and a wiper arm 5 supported rotatably at the other end of said arm 4. The gear box 3 is constructed such that upon rotation of a drive shaft 31 by means of the motor 1, a rotary shaft 42 is rotated through gears 44, 45, 43 while a disc 361 is rotated through gears 33-35. Rotation of the disc 361 will cause rocking of the auxiliary arm 4 around the drive shaft 31 through a link arm 37, and a rocking arm 32. Consequently, desired wiping motion can be achieved resulting in enlargement of the wiping area.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application 1] The present invention relates to a wiper device for a vehicle, and more particularly to a wiper device in which the rotation axis of the wiper arm is moved to expand the wiping range.

[Prior Art] In recent years, vehicle windows have tended to become larger in order to improve the open feeling of the vehicle interior, and in particular, the vertical width of the window has become larger than the horizontal width. However, with conventional wiper devices that rotate while being supported by a rotating shaft located at a fixed position near the bottom edge of the window, a relatively wide area that cannot be wiped is created on the top edge of the windshield, which has a large impact on visibility from inside the vehicle. The problem arises.

To solve this problem, various proposals have been made to move the rotation axis of the wiper arm upward (
For example, Utility Model Publication No. 58-5377, Utility Model Application No. 59-1517
No. 60).

An object of the present invention is to provide a wiper device that has a wider wiping range than the conventional wiper device by further improving the movement mechanism of the rotating shaft of the wiper arm.

[Means for Solving the Problems] The configuration of the present invention will be explained with reference to FIG.
2 is rotatably provided to which the base end of the wiper arm 5 is fixed. The wiper arm 5 and the auxiliary arm 4 form a dogleg shape. The auxiliary arm 4 is a support shaft 4 that protrudes from this.
1 (FIG. 3), it is rotatably supported by the vehicle body P.

The wiper device also includes rotary shaft driving means 31, 43, 44, 45 for rotationally driving the rotary shaft 42, and the auxiliary arm within a predetermined angle close to the left and right rotation ends of the rotation range of the wiper arm 5. a spindle driving means for rotating the spindle 41 of No. 4 in the opposite direction to the rotational direction of the wiper arm 5, and rotating the spindle in the same direction as the wiper arm rotational direction in the middle part of the wiper arm rotation range outside the predetermined angle; 32.33.
34, 36, 361, 37 (Figure 4).

[Operations and Effects] The device of the present invention is provided at the lower side of the vehicle window W as shown in FIG. 2, and at the rotation start end of the wiper arm 5, the auxiliary arm 4 is rotated in the opposite direction.

As a result, the two arms 4.5, which had been in a dogleg shape, extend almost linearly (Figs. 6 and 7), and in this state, the two arms 4.5 extend in the middle of the rotation of the wiper arm 5. Rotate in the same direction. At the end of the wiper arm 5's rotation, the auxiliary arm 4
is rotated in the opposite direction to the wiper arm 5, and both arms 4.5 again assume a dogleg shape, which is symmetrical to the above (FIG. 8). Thus, at the middle of the rotation of the wiper arm 5, the arm 5 has a sufficient length including the length of the auxiliary arm 4, and draws a long trajectory along the upper side of the window W, and at the end of the rotation, the arm 5 has a sufficient length including the length of the auxiliary arm 4. It is bent into a dogleg shape and stored within the limited left and right width of the window W. The wiping range of the device of the present invention is shown by the shaded area in FIG. As can be seen from the figure, a wide wiping range up to the top of the window W can be obtained.

[Embodiment] In FIG. 2, a wiper device is provided in the center of the body along the lower side of the front window W of the vehicle, and the wiper device includes a drive motor 1 and a known link mechanism 2 connected to the motor 1. It is composed of a gear box 3 connected through a gear box 3, an auxiliary arm 4 with a screw i rotatably supported on the gear box 3, and a wiper arm 5 rotatably supported on the other end of the auxiliary arm 4. . As shown in the figure, the auxiliary arm 4 and the wiper arm 5 form a dogleg shape and face in opposite directions in the vehicle width direction.

As shown in FIGS. 3 and 4, the gear box 3 is screwed and fixed to the body panel P, and is provided with a drive shaft 31 that extends through the body panel P and projects to the front surface of the panel P. and,
The link mechanism 2 is connected to the rear end of the drive shaft 31, and as the motor 1 rotates, the drive shaft 31 is rotated in forward and reverse directions.

The auxiliary arm 4 is a case body, and a panel 2 is attached to one end of the case body.
A cylindrical support shaft 41 that protrudes toward the surface is formed. The drive shaft 31 is inserted into the support shaft 41, and the support shaft 41 is spline-coupled to a swing arm 32 provided on the outer periphery of the portion of the drive shaft 31 that passes through the gear box 3 so as to be relatively rotatable.

A rotary shaft 42 is rotatably provided at the other end of the auxiliary arm 4, and the base of the wiper arm 5 is fixed to the rotary shaft 42. The rotating shaft 42 and the driving shaft 31 are
Each shaft 42, 31 is provided with gears 43, 44 having the same number of teeth, and is connected by an intermediate gear 45 provided between these gears 43, 44 to rotate together. The movement of the auxiliary arm 4 in the axial direction is restricted by a nut 47 screwed onto the tip of the drive shaft 31 passing through the auxiliary arm 4 with a washer 46 interposed therebetween.

Inside the gear box 3, a gear 33 fixed to the outer periphery of the drive i[1i31] must be provided along the bottom wall (Fig. 5).
, the gear 33 is connected via an intermediate gear 34 to a gear 35 disposed on the same plane as the gear 33 and supported by the gear box 3 . A central axis 36 of the gear 35 extends into the box 3, and its tip is a disk 361 as shown in FIG. One end of a link arm 37 is connected to the circumferential surface of the disc 361, and the other end of the arm 37 is connected to the tip of the swing arm 32. Note that the number of teeth of the gear 35 is 1/3 that of the gear 33.

When the drive motor 1 operates, the drive 1 is activated via the link mechanism 2.
Ii11131 is rotated, and this rotational force is transmitted to the rotating shaft 42 via the gears 43 to 45 in the auxiliary arm 4, and to the disc 361 via the gears 33 to 35. That is, when the drive shaft 31 is rotated in the direction of the arrow in FIG.
As shown by the arrow in FIG. 1, it rotates in the same direction, counterclockwise. At this time, the swing arm 32 via the link arm 37 rotates clockwise around the drive shaft 31, and the auxiliary arm 4 is also rotated clockwise accordingly (each arrow in the figure).

The auxiliary arm 4 is then rotated to the right position as shown in FIG. During this time, the wiper arm 5 fixed to the rotation shaft 42 rotates counterclockwise, but since the auxiliary arm 4 is relatively rotated around the drive shaft 31 in the opposite direction, the amount of rotation of the wiper arm 5 is It becomes large in accordance with the above relative rotation.

The sixth wiper arm 5 and the auxiliary arm 4 are arranged in a substantially straight line.
In the figure, when the disk 361 continues to rotate further, the swing arm 32 via the link arm 37 now reverses in the counterclockwise direction (each arrow in the figure). As a result, the auxiliary arm 4 is rotated counterclockwise around the drive shaft 31,
As shown in FIG. 7, it is again rotated to the left in the same manner as in FIG. 1. During this rotation to the left, wiper arm 5
continues to rotate in the counterclockwise direction around the rotating shaft 42, but since the auxiliary arm 4 is relatively rotating in the same direction as the drive shaft 31, the degree of rotation of the wiper arm 5 will depend on the relative rotation. It becomes a small thing.

When the disk 361 rotates further than in FIG. 7, the swinging arm 32 reverses again and rotates clockwise, thereby causing the auxiliary arm 4 to rotate to the right position as shown in FIG. 8. . During this period, the rotation ff of the wiper arm 5
1LJ, the auxiliary arm 4 rotates relative to the drive shaft 31 in the opposite direction, thereby becoming larger again.

Through this process, the rotation shaft 42 of the wiper arm 5 provided at the tip of the auxiliary arm 4 makes one and a half rotations around the drive shaft 31 between the x and y points in FIG. It rotates around. That is, within the rotation range of the wiper arm 5, a predetermined angle θ is set from both rotation ends.
1, the auxiliary arm 4 is rotated in the opposite direction to the rotation direction of the wiper arm 5, so that both arms 4.5 are folded. By extending the wiper arm 5 linearly and rotating it in the same direction, the arm length of the wiper arm 5 is substantially increased. As a result, the tip of the wiper arm 5 becomes Va in the figure.
As shown by L, a long trajectory is drawn along the central upper side of the window W, and a wide wiping area covering almost the entire area of the window W is realized (the shaded area in FIG. 2).

[Brief explanation of drawings]

Fig. 1 is a front cross-sectional view of the main parts of the wiper device, Fig. 2 is a front perspective view of a vehicle window equipped with the wiper device, and Fig. 3 is a front sectional view of the main part of the wiper device.
A cross-sectional view along the line ■-■ in the figure, Figure 4 is IV - of Figure 1.
5 is a sectional view taken along line IV in FIG. 4, FIGS. 6 to 8 are front sectional views of main parts showing the operation of the device, and FIG. 9 is a sectional view showing the operation of the wiper arm. FIG. 3 is a schematic front view of the vehicle window showing the range; W...Front window P...Body panel...Drive motor (drive source) 3...Gear box 31...Drive shaft 32... ... Swing arm 33.34.35 ... Gear 361 ... Disk 37 ... Link arm 4 ... Auxiliary arm 41 ...・・Support shaft 42・・Rotating shaft 43.44.45・・Gear 5・・・Wiper arm

Claims (2)

[Claims] (1) An auxiliary arm (4) with a supporting shaft (41) protruding from one end and rotatably supporting the supporting shaft (41) on the vehicle body (P); A wiper arm (5) whose base end is fixed to an auxiliary arm (4) in a dogleg shape to a rotary shaft (42) that is freely rotatable, and a rotation that drives the rotary shaft (42) of the wiper arm (5). The shaft driving means (31), (43), (44), (45) and the supporting arm (4) are supported within a predetermined angle near the end of rotation within the rotation range of the wiper arm (5). Rotate the shaft (41) in the opposite direction to the rotation direction of the wiper arm (5),
In the middle part of the wiper arm rotation range outside the predetermined angle, the spindle driving means (32), (33), (3) rotates the spindle (41) in the same direction as the rotation direction of the wiper arm (5).
4), (36), (361), and (37). (2) The support shaft of the auxiliary arm is formed into a cylindrical shape, and the drive shaft constituting the rotary shaft drive means is inserted into the cylinder, and one end of the drive shaft located on the auxiliary arm side is connected to the rotation transmission mechanism. The drive shaft is connected to the rotating shaft of the wiper arm, and the other end of the drive shaft located on the body side is connected to a drive source, and a disc constituting the support shaft driving means is connected to the drive shaft at a predetermined rotation ratio. One end of a link arm is connected to the circumferential surface of the disk, and the other end of the link arm is connected to a swinging arm fixed to the spindle, so that the disk rotates as the disk rotates. A wiper device for a vehicle according to claim 1, wherein the swing arm is rotated in opposite directions within the predetermined angle and outside the predetermined angle.