JPS63121552A - Two-piece type elastic wiper device - Google Patents

Abstract

PURPOSE:To expand a wiping area up to a part where it fails to wipe clean in the past, by increasing the number of teeth of a wiper arm rotary gear at the assistant driver's seat side more than that of the said gear at the driver's seat side to be pivotally supported on a wiper arm output shaft, and expanding the wiping area in the upper part at the assistant driver's seat side. CONSTITUTION:The number of teeth of a wiper arm rotary gear 14 at the assistant driver's seat side is increased more than that of a wiper arm rotary gear 13 at the driver's seat side to be pivotally supported on wiper arm output shafts 6 and 7. Accordingly, the speed ratio of the wiper arm rotary gear 13 at the driver's seat side to a fixed gear 12 of a wiper link output shaft 4 is larger than that at the assistant driver's seat side. Therefore, at a wiper arm 8 at the driver's seat side, its turning angle is large, and it comes to such a wiping pattern as expanding endwise long to the diver's seat upper part, whereas a wiper arm 10 at the assistant driver's seat side is small in its turning angle, thus it can be made into the wiping pattern expanded endwise long to the assistant driver's seat upper part. And, it can expand the wiping area fully of up to a part where the conventional one-piece type fails to wipe clean.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wiper device for wiping the windows of automobiles, etc., and more particularly to a bendable wiper device with a significantly expanded wiping area.

[Prior Art] Conventionally, a bendable wiper device has been devised for wiping a vertically elongated car window with a wiper blade when the car window is tilted due to the design of the car.

A conventional bendable wiper device has one wiper arm and one wiper blade, and its drive mechanism will be explained with reference to the sectional view of FIG. 8. A wiper link output shaft 4 is rotatably supported by a cylindrical portion 21 projecting from the center of a wiper pivot 17 fixed to the vehicle body 16, and is rotated by a link 3 linked to a wiper motor. One end of the housing 5, which is a wiper arm driving member, is fixed to the wiper link output shaft 4. The wiper link output shaft 4 passes through the center of the housing 5, and the cylindrical portion 2 of the wiper pivot 17 is inserted into the housing 5.
1, a wiper arm rotating gear 14 that is fixed to the wiper arm output shaft 6 and rotates the wiper arm, and a fixed gear 12 and the wiper arm that are pivotally supported on the housing 5. An intermediate gear 22 that meshes with the rotating gear 14 is housed. Although not shown, a wiper arm head is attached to the wiper arm output shaft 6.

Next, the operation of this bendable wiper device will be explained. When the wiper link output shaft 4 is rotated by the link 3, the housing 5, which is a wiper arm driving member fixed to the wiper link output shaft 4, is rotated. When the housing 5 rotates, the intermediate gear 22 pivotally supported by the housing 5 starts rotating by the fixed gear 12, and the wiper arm rotating gear 14 meshing with the intermediate gear 22 rotates in the opposite direction to the rotation direction of the housing 4. do. As a result, the wiper arm starts a wiping operation, which will be explained with reference to a schematic diagram showing the wiping state in FIG. 9.

When the housing 5, which is at the wiping start position of the wiper blade shown in FIG. move towards. housing 5
When the wiper arm 8 makes a quarter turn and comes to the center position tc, the wiper arm 8 makes about a half turn and comes to the center position C, so the wiping range G at the center position C is The wiper blade 9 is elongated by being aligned substantially in a straight line. Furthermore, when the housing 5 rotates approximately one-fourth of a turn to the left, the wiper arm 8 rotates approximately 2 times to the right.
The wiper blade reaches the open position 0, which is the wiping end position, after one-quarter rotation, and the housing 5 and the wiper arm 8 are bent, so the wiping range P at the open position 0 is as short as at the set position S. A vertically elongated elliptical wiping pattern as shown in FIG. 9 is formed.

However, in this single-type bendable wiper drive mechanism, in order to expand the wiping area near the upper front of the driver's seat side, the method of connecting the wiper link output shaft 4 and the wiper arm output shaft 6, the wiper link output shaft 4 By changing the rotation ratio between the wiper arm output shaft 6 and the wiper arm output shaft 6, a diagonally elongated wiping pattern as shown in FIG. 10 can be obtained, but the wiping area on the passenger seat side becomes smaller, which poses a safety problem.

[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned problems of the conventional single-type bending/extending wiper device. At the same time, it is an object of the present invention to provide a bendable wiper device that has an expanded wiping area on the passenger seat side.

[Means for Solving the Problems] The two-piece bending and extending wiper device of the present invention includes a wiper pivot having a cylindrical portion at the center and fixed to the vehicle body, and a rotatably supported shaft on the cylindrical portion of the wiper pivot. a wiper link output shaft, a wiper arm drive member having a substantially triangular shape and having one vertex of the triangle fixed to the wiper link output shaft; a fixed gear fixedly fixed thereto; a driver's seat side wiper arm rotary gear pivotally supported by a wiper arm output shaft at the apex of the wiper arm drive member on the driver's seat side; a supported passenger seat side wiper arm rotating gear, and a rotational coupling means for coupling the relative rotation of the driver seat side wiper arm rotating gear and the passenger seat side wiper arm rotating gear with respect to the fixed gear so that they rotate in opposite directions. At the same time, the wiper arm is curved toward the passenger side so that the driver's side wiper arm with a stop position on the half-speed side and the passenger side wiper arm with a stop position on the passenger side are attached to their respective wiper arm output shafts. The wiping area above the passenger seat side is expanded by increasing the number of teeth of the wiper arm rotation gear on the passenger seat side than the 'fi number of the wiper arm rotation gear on the driver seat side.

[Operation] When the wiper link output shaft is rotated by the link, the wiper arm drive member whose one end is fixed to the wiper link output shaft is rotated. When the wiper arm drive member rotates, the driver's seat side wiper arm rotating gear and the passenger seat side wiper arm rotating gear are driven by the rotating coupling means that connects the relative rotation of the wiper arm rotating gear with respect to the fixed gear so that the wiper arm rotating gear rotates in opposite directions. Rotates in the opposite direction to the rotation direction of the member. As a result, the wiper arm starts the wiping operation, but the wiper arm and the wiper arm drive member are bent at the wiper arm stop position ff (set side) and the wiper arm wiping end (open side), and near the center, they are aligned in a straight line, forming a vertically long wiping pattern. is formed. However, the number of teeth on the wiper arm rotation gear on the driver's side is smaller than the number of teeth on the wiper arm rotation gear on the passenger's side.
The rotation ratio of the driver's side wiper arm rotating gear to the fixed gear is larger than that of the passenger's side wiper arm rotating TR wheel. Therefore, the driver's side wiper arm rotates at a large angle, creating a vertically extending wiping pattern above the driver's seat. On the other hand, the wiper arm on the passenger seat side has a small rotation angle and can create a vertically extending wiping pattern on the upper part of the passenger seat side, which is an area that could not be wiped with the conventional single bending wiper device. The wiping area can be expanded sufficiently.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, and FIG.
FIG. 2 is a perspective view of the embodiment shown in the figure attached to a vehicle. The wiper motor 1 rotates the crank arm 1a using a built-in reduction gear. One end of a link rod 2 is connected to the crank arm 1a and reciprocates. A lever 3 is connected to the other end of the link rod 2 via a ball pin 3a, and the wiper link output shaft 4 is rotated by the lever 3. One end of a housing 5, which is a wiper arm driving member, is screwed and fixed to the wiper link output shaft 4, and two wiper arm output shafts 6 are attached to the other end of the housing 5.
and 7 are pivotally supported.

These two wiper arm output shafts 6 and 7 are shafts that are rotated by the housing 5, and are rotatably supported by the housing 5. Wiper arm heads of two wiper arms 8 and 10 having wiper blades 9 and 11 attached to their tips are fixed to the two wiper arm output shafts 6 and 7, respectively.

Next, details of the housing 5, which is a wiper arm driving member, will be explained with reference to the sectional view in FIG. 3 and the exploded perspective view in FIG. 4. A wiper pivot 17 having a cylindrical portion 21 at the center is fixed to the vehicle body 16 with bolts 18.18. The wiper link output shaft 4 is pushed through and supported by the cylindrical portion 21 of the wiper pivot 17, and the lever 3 is unrotatably fixed to the lower end thereof. The housing 5 consists of upper and lower cases, and the upper and lower cases are fixed with screws or the like (not shown). A cylindrical portion 21 of the wiper pivot 17 passes through the lower case 5a of the housing 5, and the upper case 5b is fixed to the upper end of the wiper link output shaft 4 with a nut 20. Further, inside the housing 5, a fixed gear 12 whose axis is passed through by the wiper link output shaft 4 and fixed to the cylindrical portion 21 of the wiper pivot 17 with screws 19, 19, and a fixed gear 12 which is rotatably supported in the housing 5. wiper arm output shafts 6 and 7 and wiper arm output shafts 6 and 7
A driver seat side wiper arm rotation gear 13 and a passenger seat side wiper arm rotation gear 14 are housed.

The number of teeth of the wiper arm rotating gear 14 on the passenger seat side is greater than the number of teeth on the wiper arm rotating gear 13 on the driver's seat side.
The details of the inside of this housing 5 are shown in FIG.
As shown in the cross-sectional area, the housing 5 itself has a substantially triangular shape, a fixed gear 12 is fixed to one of the apexes of this triangle, and a driver's seat is fixed to the apex on the driver's seat side. A side wiper arm rotation gear 13 is pivotally supported by the wiper arm output shaft, and a passenger seat side wiper arm rotation gear 14 is pivotally supported at the apex on the passenger seat side by the wiper arm output shaft. A timing belt 15 is wound around the outer circumferences of the fixed gear 12, the wiper arm rotation gear 13 on the driver's seat side, and the wiper arm rotation gear 14 on the passenger seat side, and these three gears are connected by the timing belt 15. Since the fixed gear 12 is fixed to the cylindrical portion 21 of the wiper pivot 17, it is immovable relative to the vehicle body 16, but the wiper link output shaft 4 is rotatable relative to the fixed gear 12.
The housing 5 is fixed to the wiper link output shaft 4.
Therefore, it rotates in accordance with the rotation of the wiper link output shaft 4. On the other hand, the driver seat side wiper arm rotation gear 13 and the passenger seat side wiper arm rotation gear 14 are pivotally supported by the housing 5 by the wiper arm output shafts 6 and 7, and thus rotate together with the housing 5. Now, move the lever 3 shown in FIGS. 3 and 4 to the fifth position around the wiper link output shaft 4.
When the housing 5 is rotated in the direction indicated by the arrow in the figure, the housing 5 is also rotated in the direction indicated by the arrow centered around the wiper link output shaft 4. In this case, the fixed gear 12 is fixed to the vehicle body 16 via the wiper pivot 17, so the fixed gear 12 is fixed to the vehicle body 16 via the wiper pivot 17.
2 and the driver's seat side wiper arm rotating gear 13 and passenger's seat side wiper arm rotating gear 14 are constant. They rotate in the direction of arrow B while remaining engaged. That is,
The directions of rotation of the driver's seat side wiper arm rotating gear 13 and the passenger's seat side wiper arm rotating gear 14 are opposite to the rotating direction of the housing 5. Here, the ratio of the fixed gear 12 to the driver's seat side wiper arm rotating gear 13 and the passenger's seat side wiper arm rotating gear 14 is determined by the ratio of the number of teeth of the driver's seat side wiper arm rotating gear 13 to the number of teeth of the passenger's seat side wiper arm rotating gear 1.
The number of teeth is less than 4.

Next, the operation of this embodiment will be explained with reference to a schematic diagram showing a wiping state in FIG. 6. In the set position ■■, which is the stop position of the two wiper arms, the housing 5 and each wiper arm are in the most bent state. When the housing 5 rotates in the inward direction around the wiper link output shaft 4 from this wiper arm set position The timing belt 15 meshing with the fixed gear 12 causes the wiper arms 8 and 10 fixed to the wiper arm output shafts 6 and 7 to also rotate in the B direction. move.

First, to explain the movement of the wiper arm 10 fixed to the wiper arm output shaft 7, when the wiper arm 10 comes to the position (■) in the upper left part of the passenger seat, the wiper arm 1
0, the fixed gear 12, and the wiper arm rotating gear 14 are almost in a straight line, and the wiper arm 10 is extended by the distance Lt between the fixed gear 12 and the wiper arm rotating gear 14. When the housing 5 is further rotated, the housing 5
L□ and the wiper arm 10 are bent, and when the wiper arm 10 is at the position ■, that is, the open position at the center of the front window, which is the wiping end of the wiper arm 10, it is in the most bent state.

On the other hand, the same applies to the wiper arm 8 fixed to the wiper arm output shaft 6, which rotates in the direction of arrow B from the set position (■) which is the first stop position, and moves the wiper arm 8 to the position (■) in the upper right part of the driver's seat. The direction is substantially parallel to the direction in which the fixed gear 12 and the wiper arm rotating gear 13 are connected by a straight line, and the wire is extended by that distance until it reaches its maximum extension.

When the housing 5 further rotates, the wiper arm 8 and the housing 5 are bent again, and are in the most bent state at the open position (3) at the lower right of the front window, which is the wiping end of the wiper arm. Wiper arm 8 and wiper arm 1
Needless to say, when 0 is reversed from the open position to the set position, the same wiping pattern as in the normal rotation described above is drawn.

Note that the wiper arm 10 is placed at the left corner (position ■), and the wiper arm 8 is placed at the right corner (position ■).
In order to make the wiper arm and the housing 5 fully extended, the rotation ratio of the fixed gear 12 and the wiper arm rotation gears 13 and 14 is a problem, but in this case, the rotation ratio is fixed gear 12:wiper arm rotation gear. 13: Wiver arm rotating gear 14 = 3.0 + 1.0: It is best to set it as 1.3.

As shown in FIGS. 1 and 2, the reason why the wiper arm 8, which is bent significantly to the left, does not intersect with the wiper arm 10 is because the rotation speed of the wiper arm 8 is faster than the rotation speed of the wiper arm 10. Therefore, the two wiper arms do not collide or contact each other, and as is clear from FIG. This is an area larger than that of the conventional single-wiper type wiper, and it can be seen that the visibility on the passenger seat side has been significantly improved.

Figure 7 shows the state of the airflow on the windshield surface while a car is running. Due to the slope of the glass, airflow flows in the direction closer to the center line of the car body in the center of the car body, and on the outside of the car body due to the curvature of the glass on the sides. Flows in direction A. Therefore, compared to the conventional two-wiper type wiper in which the arm shaft is located away from the center of the vehicle body, the second wiper of the present invention in which the drive shaft of the wiper is located in the center of the vehicle body
In the main type bending wiper, two wiper blades 9 and 1
The center of rotation of the wiper blade 1 is approximately at the center of the vehicle, and the wiper blades 9 and 11 at each position during wiping are positioned along the airflow, thereby reducing resistance to the airflow.

[Effects of the Invention] As described in detail above, the two-piece bending/extending wiper device of the present invention includes a wiper arm drive member rotated by the wiper link output shaft, and a fixed gear fixed to the vehicle body via the wiper pivot. A mechanism in which two wiper arm output shafts are pivotally supported and the wiper arm output shafts rotate in opposite directions relative to fixed gears allows the two wiper arms to perform wiping operations at the same time. The wiper arm and the wiper arm drive member are bent at the wiper arm wiping end (open side) and the wiper arm wiping end (open side), and near the center, they are aligned in a straight line, forming a vertical wiping pattern, and the rotation ratio of the two wiper arm output shafts relative to the fixed gear. And since the distance between the axes can be freely selected, there is an excellent effect of being able to wipe a wide area, especially the passenger seat side, which could not be wiped sufficiently with the conventional single bending/extending wiper device.

Furthermore, since the two wiper arm output shafts are located at the center of the vehicle body, they are less affected by airflow on the windshield surface, and it is possible to prevent the wiper blades from lifting up during high-speed driving.

Furthermore, only the drive part is different from the conventional single-wiper bending/extending wiper, and the lever and wiper link output shaft of the conventional single-wiping wiper link can be used as is, making it extremely easy to convert to a dual-wiber link. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, and FIG.
FIG. 3 is a detailed sectional view of the housing that is the wiper arm drive member, FIG. 4 is an exploded perspective view of the wiper arm drive member, and FIG. 5 is the same as that shown in FIG. 3. ■A cross-sectional view taken along the line -V, FIG. 6 is a schematic diagram showing the wiping cover of this embodiment, FIG. 7 is a front view of the windshield showing the state of airflow, and FIG. 8 is a conventional single-type bending/extending The cross-sectional views of the wiper device, FIGS. 9 and 10, are schematic diagrams of the wiping pattern of a conventional single-width bending wiper device. DESCRIPTION OF SYMBOLS 1... Motor, 2... Link rod, 3... Lever, 4... Wiper link output shaft, 5... Housing, (6, 7)... Wiper arm output shaft, (8, 10
)... Wiper arm, 11)... Wiper blade, 12... Fixed gear, 13... Driver's seat side wiper arm rotating gear, 14... Passenger seat side wiper arm rotating gear, 15...・Timing belt, 16... Vehicle body, 17... Wiper pivot, 21... Cylindrical part of wiper pivot Part 4 Figure 5 Figure 7

Claims (2)

[Claims] (1) A wiper pivot having a cylindrical portion at the center and fixed to the vehicle body, a wiper link output shaft rotatably supported by the cylindrical portion of the wiper pivot, and a substantially triangular wiper link output shaft. a wiper arm drive member having one of the vertices of the triangle fixed to the vertices; a fixed gear through which the wiper link output shaft passes through the center and is fixed to the cylindrical portion of the wiper pivot; and a fixed gear fixed to the cylindrical portion of the wiper pivot; a driver's seat side wiper arm rotating gear pivotally supported by a wiper arm output shaft; a passenger seat side wiper arm rotating gear pivotally supported by a wiper arm output shaft at the apex of the wiper arm drive member on the passenger's seat side; The wiper arm is provided with a rotary connection means that connects the relative rotation of the side wiper arm rotation gear and the passenger seat side wiper arm rotation gear so that they rotate in opposite directions, and the wiper arm is curved toward the passenger seat side and stopped on the passenger seat side. A driver's side wiper arm with a position and a passenger's side wiper arm with a stop position on the passenger's seat are attached to their respective wiper arm output shafts, and the driver's side wiper arm has a stop position on the passenger's seat side. A two-piece bending wiper device characterized by increasing the number of teeth on the side wiper arm rotating gear to expand the wiping area above the passenger seat side. (2) The two-piece bending/extending wiper device according to claim 1, wherein the rotational connection means is a timing belt.