JPS6055334B2 - wiper drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiper drive device for a vehicle, and more particularly to a wiper drive device for a vehicle that has a relatively simple structure and is configured to cause a wiper to reciprocate and rotate reliably.

A wiper is attached to the window installed on the front window or back door of a vehicle to wipe the window glass surface in order to improve the visibility of the window in rainy weather. A conventional example of a wiper drive device for moving the wiper is shown in FIG. 1, for example.

This drive device connects an electronic control device 2 to a power source 3, and connects a drive motor 1 to an output terminal of this electronic control device 2.
and connect the wiper 4 to the rotating shaft of the drive motor 1.
are connected via a speed reduction mechanism or the like. The drive motor 1 can rotate in both forward and reverse directions, and the electronic control device 2 has a built-in switching circuit that switches the direction of the current flowing through the drive motor 1 at regular intervals. It performs a reciprocating rotational movement together with the first rotating shaft at regular intervals. A wiper 4, drive motor 1, and electronic control device 2 having the above configuration was used and was published in the 32nd edition of the "NISSAN Service Bulletin" published in January 1932, from pages 332 to 340. There is a Laurel car. However, in such conventional vehicle wiper drive devices, the control device for reciprocating rotation of the wiper 4 was electronic, so the cost of parts was high and the number of units produced was low. had the problem of high production costs.

Furthermore, as shown in FIG. 2, there has conventionally been a wiper drive device/device 26 that mechanically rotates the wiper in a reciprocating manner. That is, in this wiper drive device 26, a small gear 27 is directly connected to a motor (not shown).
Inside the casing 28, the small gear 27 has a large gear 29.
The large gear 29 is interlocked with a rack 32 provided with a slider 31 through a continuous piece 30, and two sector gears 33 are meshed with the rack 32. A wiper arm 34 is fixed to the gear 33. Therefore, the driving force of the motor is the small gear 27 and the large gear 2.
9 is converted into a reciprocating motion of the rack 32 by the link mechanism constituted by the continuous pieces 30, and this reciprocating motion causes the sector gear 33 to rotate in forward and reverse directions, and the wiper arm 34 to reciprocate at regular intervals. This is what we do. However, such a conventional wiper drive device 2
6, the manufacturing cost increases due to the large number of parts, and space is required for the rack 32 to move back and forth, so it can be applied to a front window wiper that has plenty of mounting space, but It cannot be applied to wipers such as rear window wipers and fender mirrors that do not have enough room, and the wiper drive device 26 has the drawback of being limited in the mounting location. The present invention has been made in view of these conventional drawbacks, and aims to reduce the number of parts, have a relatively simple structure, and reduce production costs. It is an object of the present invention to provide a wiper drive device which can be configured to be compact as a whole and which is not limited to a mounting location.

To achieve this purpose, the present invention includes a drive gear connected to a motor, an idler gear having the same diameter as the drive gear and meshing with the drive gear, an output gear fixedly supporting the wiper, and a drive gear. It consists of a drive belt connected between a gear, an idler gear, and an output gear. ! When it is at the top, the other end corresponds to almost the top of the other gear, and the middle part engages the outer periphery of the output gear to cause the output gear to reciprocate and rotate in conjunction with the rotational movement of the drive gear. This is what I did.

Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 3 to 6 are diagrams showing one embodiment of the present invention.

The vehicle wiper drive device according to this embodiment includes a drive gear 6 supported by a casing 5 containing a motor, and an idler gear 7 having the same diameter as the drive gear 6 and meshing with the drive gear 6. , an output gear 8 disposed at a predetermined distance from the drive gear 6 and idler gear 7, and a drive belt 10 connected to the drive gear 6, idler gear 7, and output gear 8. The drive gear 6 has a shaft 11 at its center, and this shaft 11
is connected to the rotating shaft of the motor via a speed reducer within the casing 5, and rotates at a constant speed ratio as the motor rotates.

The idler gear 7 is attached to the casing 5 by a shaft 12 so as to be freely rotatable, and by the rotational operation of the drive gear 6, the idler gear 7 rotates at the same rotational speed as the drive gear 6 in a direction opposite to that of the drive gear 6. It is designed to rotate in degrees.
The drive gear 6 and idler gear 7 are incorporated together with the casing 5 into the cowl box of the vehicle or at the bottom of a back door window, and are supported by the vehicle body. On the other hand, the output shaft 8 is supported by a rotating shaft 15 supported by the vehicle body at a predetermined distance from the drive gear 6 and idler gear 7. The center of the rotating shaft 15 of the output gear 8 is the center of the shaft 11 of the drive gear 6 and the shaft 1 of the idler gear 7
2 is installed on the bisector of the center, and either shaft 1
It is also equidistant from the centers of numbers 1 and 12. As shown in FIG. 4, the rotating shaft 15 is held within a hollow cavity 20 of a holder 19, which is fixed to the vehicle body and has a hollow cavity 20, via a bearing 17 such as a ball bearing. The bearing 17 is installed in the hollow cavity 19 so as to be movable in the horizontal direction, and a contact member 18 in which a holding hole 22 is formed is attached to a part of the outer wall thereof. On the other hand, a spring engagement hole 21 is formed in the inner circumferential wall of the hollow cavity 20 of the holding body 19, facing the holding hole 22.
is formed, and by inserting one end of the spring 23 into the spring engaging hole 21 and inserting the other end of the spring 23 into the enclosing hole 22 to provide a spring action, the bearing 17 is attached to one side of the hollow cavity 20. It is energized towards. And the wiper 9 is attached to the rotating shaft 15.
are connected directly or via a gearbox. The drive belt 10 is formed by molding resin, metal, or rubber material into a belt shape, and has a drive end 10a that fits into a locking pin 13 protruding from the side surface of the drive gear 6, and a locking pin 13 protruding from the side surface of the idler gear 7. A rack 16 is formed over a predetermined length range on the inner surface of the intermediate portion of the drive belt 10 and engages with the teeth of the output gear 8.

The locking pin 13 and the locking pin 14 are symmetrical with respect to a base line 1 connecting the center lines of the shaft 11 and the shaft 12 when the drive gear 6 and the idler gear 7 rotate in opposite directions while meshing with each other, and The components in one direction of the base line are set in a positional relationship such that they rotate while translating with each other. That is, the locking pin 13 is at the topmost position A in FIG.
1, the locking pin 14 is also at the topmost position B1, and the drive gear 6 rotates in the direction of arrow S to lock the locking pin 1.
3 moves to the positions A2, AG, and Al, the locking pin 14 moves to the positions B2, B3, and B4 corresponding to each of the above positions. The driving end 10a and driven end 10b of the drive belt 10 are rotatably fixed to these locking pins 13 and 14, and the intermediate portion of the drive belt 10 engages with the outer periphery of the output gear 8 for loading. be done. With this configuration, when the motor is operated to rotate the drive gear 6 in the direction of arrow S in FIG. 5, the idler gear 7 meshed with it rotates in the opposite direction at the same speed, while 13 and 14 also rotate together with each gear 6 and 7.

In this case, the locking pin 13 is located at the position A4→A1→A.
Along with this, the locking pin 14 moves from B4→2→
While moving to B2, the drive belt 10 is driven by the lower belt 1.
Since tension is applied to 0d, the output gear 8 is rotated in the direction of arrow T under the action of the drive belt 10, and the wiper 9 connected to the rotating shaft 15 is also rotated in the corresponding direction. On the other hand, the locking pin 13 moves from position ~ → A3 → Mr., and the locking pin 14 moves from position 8 → B3 → B4.
During the movement, tension is applied to the upper belt of the drive belt 10, the output gear 8 receives the action of the drive belt 10 and rotates in the direction opposite to the arrow T, and the wiper 9 also rotates in the direction opposite to the upper belt. Rotate to. Therefore, while the drive gear 6 and idler gear 7 rotate once, the output gear 8 and wiper 9 rotate reciprocatingly through a predetermined angle for one cycle. Therefore, if the drive gear 6 is continued to be rotated by the motor, the output gear 8 can be rotated back and forth many times, and the wiper 9 can perform a wiping operation. Note that the rotation angles of the output gear 8 and the wiper 9 can be freely changed by changing the diameter of the output gear 8, and if only the rotation angle of the wiper 9 is considered, it is possible to change the rotation angle of the output gear 8 and the wiper 9. The angle can also be changed by changing the gear ratio of the gearbox. Further, as already mentioned, since the center line of the rotating shaft 15 is placed on the bisector of the centers of the shafts 13 and 14, and the locking pins 13 and 14 are arranged in a predetermined relationship, the above-mentioned During the rotational movement of the drive gear 6, etc., the drive belt 10 from the lock pin 13, which goes around the output gear 8 and reaches the lock pin 14, can always maintain a constant length and is not distorted during its operation. You can change direction. Furthermore, even when the output gear 8 is displaced in the vertical direction in FIG. By doing so, it is possible to absorb distortion. Furthermore, variations in the installation position of the output gear 8 with respect to the drive gear 6 and the idler gear 7 can be easily absorbed by elastically supporting the rotating shaft 15 with the spring 23. FIG. 6 shows a case where the drive belt 10 and the output gear 8 are modified to a different structure and the engagement method of both members is changed.
It is a figure which shows the 2nd Example of this invention.

In this embodiment, a plurality of holes 24 are formed in the drive belt, and the holes 24 are formed in the outer peripheral surface of the output gear 8.
A plurality of protrusions 25 are provided at intervals corresponding to . Then, the drive belt 10 can be wound around the outer periphery of the output gear 8, and the protrusion 25 can be fitted into the hole 24 to engage both members. Since the drive belt 10 and the output gear 8 are configured by providing the hole 24 on one side and the protrusion 25 on the other side, the configuration can be simplified compared to the first embodiment, and the manufacturing process can be simplified. Cost reduction can be achieved. As explained above, according to the present invention, a drive gear and an idler gear having the same diameter are engaged with each other, and an output gear that supports a wiper is arranged at a distance from these gears, and the two The drive gear and idler gear are operatively connected to the output gear by a belt with each end fixed to the gear, and the output gear is rotated in a reciprocating manner in conjunction with the rotational movement of the drive gear.
Unlike conventional wiper drive devices, it is possible to provide a wiper drive device that can reduce the number of parts, has an extremely simple configuration, and is reliable in operation.

This makes it possible to reduce manufacturing costs and downsize the device itself, allowing it to be installed even in relatively narrow spaces such as inside the cowl box or back door of a vehicle. Therefore, it can be applied to wipers such as rear window wipers and fender mirrors, and it is possible to achieve the effect that the mounting location is not limited unlike conventional wiper drive devices.

[Brief explanation of the drawing]

Figure 1 is a diagram showing an example of a conventional wiper drive device, Figure 2 is a diagram showing an example of a conventional wiper drive device.
The figure is an explanatory diagram showing the configuration of a conventional wiper drive device.
The figure is a perspective view showing essential parts of the first embodiment of the present invention, FIG. 4 is a sectional view showing an example of the support structure for the output gear in the embodiment shown in FIG. 3, and FIG. FIG. 6 is a diagram showing the operating principle of the drive device, and is a diagram showing a second embodiment of the present invention in which the structure of the drive belt and output gear is changed. 5... Casing, 6... Drive gear,
7... Idler gear, 8... Output gear, 9... Wiper, 10... Drive belt, 13, 14... Locking pin .

Claims (1)

[Claims] 1. A drive gear connected to the motor, an idler gear having the same diameter as the drive gear and meshing with the drive gear, an output gear that fixedly supports the wiper, and a drive gear connected between the drive gear, the idler gear, and the output gear. The drive belt has one end fixed to the drive gear and the other end fixed to the idler gear, and the fixed position of the belt is such that one end is at the top of one gear and the other end is at about the top of the other gear. A wiper drive device characterized in that the middle portion engages with the outer periphery of the output gear, and causes the output gear to perform reciprocating rotational movement in conjunction with the rotational movement of the drive gear.