JPS6116155A - Wiper unit - Google Patents

Abstract

PURPOSE:To provide a wiper blade with a wide wiping area of a degree close to 180 deg. by shaping the head of a wiper arm in the divided form of an arm head part serving for supporting the wiper blade and another arm head part serving for driving the wiper blade. CONSTITUTION:A wiper arm 32 which is connected to a wiper driving shaft has an arm head consisting of a primary arm head 33, which is a supporting means for a wiper blade, and a secondary arm head, which is a driving means for said blade. The transmission of turning force from the secondary arm head 30 to the primary arm head 33 is performed via a pin 44. A gear part 46 is provided for the primary arm head 33 and is to be engaged with a fixed guide gear 47 which is concentrically disposed with a wiper driving shaft. When the primary arm head 33 is turned by the secondary arm head 30 via a pin 44, the arm head 33 will then the bent at the point of the pin 44 so that when the wiper blade reaches a turning end, the wiper blade may come to a position parallel to the corresponding side part of a window glass.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a wiper device applied to vehicles in general, including automobiles.

For example, as a conventional wiper device,
There is the one disclosed in Japanese Patent No. 655 and the one shown in FIGS. 6 and 7. In these wiper devices, a wiper drive shaft 3 is arranged at a vehicle body part 21C on the outer edge of the windshield 1, and a wiper blade 5 supported by a wiper arm 4 is rotated to wipe the surface of the windshield 1. However, it is difficult to widen the wiping area A to 180°. So the 6th
In the wiper device shown in the drawings and FIG. 7, the arm head 6 of the wiper arm 4 is formed in advance into a bent shape.

By arranging the wiper blade 5 to be parallel to the corresponding side 7 of the window glass 1 as much as possible, the wiping area A is made correspondingly larger.

Further, as another conventional example, there is a wiper device as shown in FIGS. 8 and 9. This wiper device has a wiper drive shaft 3 disposed inside the windshield 1 so that the wiper blade 5 can be connected to the starting edge corresponding side 7 of the windshield 1, and the terminal end when the wiper blade 5 rotates in the direction of arrow B. The wiping area A is made to be wide and close to 180° by extending parallel to the corresponding side 8 of the wiping area A.

Problems to be Solved by the Invention In the conventional example shown in FIGS. 6 and 7, the arm head 6 is formed in a bent shape, so that the wiper blade 5 approaches the starting end corresponding side 7 of the windshield 1 and the wiping area A is reduced. However, when the wiper blade 5 is rotated in the direction of arrow B, a non-wiping part 9 is left between it and the corresponding side 8 at the end of the rotation, and the end 10 of the wiper blade 5 is It tends to hit the corresponding side portion 8.

Furthermore, in the conventional example shown in FIGS. 8 and 9, the wiper drive shaft 3 is arranged inside the windshield 1, which is advantageous in that a wider wiping area A of nearly 180° can be obtained compared to the previous conventional example. However, on the other hand, is there a through hole (not shown) through which the wiper drive shaft 3 is passed? A hole must be formed in the windshield 1 by machining, and if the positional accuracy of this through hole and the vehicle body mounting hole is not achieved, it will be difficult to assemble the wiper device, and in some cases, unreasonable force may be applied to the windshield 1. In addition, the wiper device motor and gear case (
(not shown) etc. from the outside, black printed part 1
1 needs to be applied near the corresponding sides 7 and 8 of the window glass 1, and if this is done, there is a problem that the field of view of the window glass 1 is blocked by the black printed part 110 and becomes narrow.

A Companion Means to Solve the Problems Therefore, the present invention solves the latter problem of the conventional example (Figs. 8 and 9) by disposing the wiper drive shaft at the outer edge of the windshield, and also by arranging the wiper drive shaft at the outer edge of the windshield. The present invention attempts to solve the problem of the former conventional example (FIGS. 6 and 7) by changing the bending state according to the rotating direction of the wiper arm, rather than being fixed. More specifically, the present invention includes an arm head of a wiper arm, a first arm head for supporting a wiper blade, and a first arm head that is directly connected to a wiper drive shaft to rotate the first arm head. The first arm head is formed with a second arm head that pins the base, and a gear part is provided at the base of the first arm head, and this gear part is meshed with a fixed guide gear arranged concentrically with the wiper drive shaft. The gist is that the end of the arm head's rotation is parallel to the corresponding side of the windshield.

By rotating the wiper drive shaft alternately in the forward and reverse directions, the second arm, which is directly connected to the wiper drive shaft, rotates its tip in the forward and backward directions.
The first arm head, which is rotated in the opposite direction and then pinned to the second arm head, follows the second arm head and rotates in the same direction. At this time, the first arm head is 1.
Since the gear part provided at the base is in mesh with the fixed guide gear arranged concentrically with the wiper drive shaft, the tip of the first arm head, which rotates around the pin and supports the wiper blade, This results in a bent state with the pin as a fulcrum relative to the second arm head. Therefore, if an arbitrary gear ratio is selected for the fixed guide gear and the gear part of the first arm head, the first arm head will be placed parallel to the corresponding side of the windshield, and there will be no wiper blade. In the rotation direction, the blades are bent relative to the respective corresponding sides at the end of the rotation, resulting in an extremely wide wiping area of the wiper blade, which is close to 180°.

Embodiment Next, an embodiment will be described. In the following, parts common to the conventional one are denoted by the same reference numerals and redundant explanation will be omitted.

1 to 3 are diagrams showing a first embodiment of the present invention.

[Wiper drive shaft]

The wiper drive shaft 3 is arranged in a vehicle body part 20 at the outer edge of the windshield 1, and a cylindrical bearing 23 with seven flange 22 is inserted into a through hole 21 provided in the vehicle body part 20. 3 is supported so that it can freely rotate in forward and reverse directions.

The lower part of the wiper drive shaft 3 is connected to a wiper pivot arm 25 via a spring washer 24, and the wiper pivot arm 25 is connected to an arm pole portion 26. Same ball bearing 27
It is connected to a driving source (not shown) via a. On the other hand, the upper part of the wiper drive shaft 3 has serrations 2 in the tapered part.
8 is formed, and the base 31 of the second arm head 30 is tightened and fixed by a fixing nut 29.

[Wiper arm]

The "arm head" of the wiper arm 32 connected to such a wiper drive shaft 3 is formed by a first arm head 33 for supporting the wiper blade 5 and a second arm head 30 for driving as described above.

[First Arm Head] A wiper arm retainer 35 is supported by pins 36 at the tip 34 of the first arm head 33, and supports the arm piece 31 that holds the wiper blade 5I7i. And the base of this arm piece 3γ is the spring 3
8 and a spring hook 39 to the above-mentioned tip 34, so that the wiper blade 5 can be pressed against the surface of the windshield 1 with a constant force. A pin hole 41 is provided in the base 40 of the first arm head 33.
A pin 44 is attached to the hole through which a bearing washer 42, 43 is interposed, rotatably connecting the tip 45 of the second arm head 30 and the base 40. Further, the entire base 40 is formed into a fan shape, and a gear portion 46 is formed in an arc-shaped portion corresponding to the tip of the fan, and is meshed with a fixed guide gear 47.

[Second arm head] The second arm head 30 also has an opening hole 48 in the base 31.
The tapered serrations 28 of the wiper drive shaft 3
The wiper drive shaft 3 is directly connected to the wiper drive shaft 3 by meshing with the wiper drive shaft 3.

The aforementioned pin 44 is inserted into the pin hole 49 of the tip portion 45 so as to transmit the rotational movement of the wiper drive shaft 3 to the first arm head 33 so as to rotate it in the forward and reverse directions. Note that 50 is a hole for attaching the cover.

[Fixed guide gear]

By the way, the above-mentioned fixed guide gear 47 is arranged near the wiper drive shaft 3 so as to be concentric with the wiper drive shaft 3. This fixed guide gear 47 is for bending the first arm head 33, and a guide gear portion 51 corresponding to the gear portion 46 of the first arm head 33 is provided at the one-arc-shaped tip.
A bolt 52 for fixing is provided at the base. The reference numeral 53 is an insertion hole, which makes it easy to mount the fixed guide gear 47 on the outside of the wiper drive shaft 3 and the cylindrical bearing 23 thereof.

Then, the gear part cover 54 covers the fixed guide gear 47 and the second gear part cover 54.
Base 40 of arm head 30 and first arm head 33
It is attached to the second arm head 30 with screws 55 that cover the second arm head 30.

Next, the effect will be explained.

Drive source (not shown) and p-ball bearing 27. Arm ball part 26. When the wiper drive shaft 3, supported by the bearing 23, pivots in the forward or reverse direction by the driving force transmitted via the wiper pivot arm 25, etc., the second wiper shaft 3, which forms part of the wiper arm 32, The arm bed 30 rotates its tip 45 in the direction of arrow B or in the opposite direction of arrow B, and due to this rotation, the pin 44 moves on a rotation trajectory with the wiper drive shaft 3 as a fulcrum, Therefore, the first arm head 33 connected by this pin 44 also rotates in the direction of arrow B or in the opposite direction of arrow B. However, since the gear portion 46 formed on the base 40 of the first arm head 33 meshes with the guide gear portion 51 of the fixed guide gear 47,
The first arm head 3
3 indicates a swinging state 9, that is, a bending state with respect to the second arm head 30.

The corresponding side γ of the windshield 1 at the end of rotation.

8, and the wiping area A becomes wide, close to 180'.

4 and 5 show a second embodiment of the invention. In this embodiment, the vibration absorber 56 is attached to the fixed guide gear 4T. To be more specific, the vibration absorber 5
An "elastic body" 6 is baked and adhered to the lower WJ 57 of the base of the fixed guide gear 47 and the inner surface of the insertion hole 53, and furthermore, a collar 58 is integrated with the outer surface of the bearing 23 of the wiper drive shaft 3.

According to this embodiment, the fixed guide gear 47, which needs to be disposed concentrically with respect to the wiper drive shaft 3, can be assembled to the wiper drive shaft 31C with high precision, and the first arm head 33 can be attached to the fixed guide gear 47 with high precision. Gear part 4
Vibrations generated by the meshing of the bearings 23 and the wiper drive shaft 3. Further, it is possible to make it difficult for the fixed guide gear 47 to be transmitted to the vehicle body part 20 as the other party to which the fixed guide gear 47 is fixed.

Other configurations and operations are similar to those of the first embodiment, so common parts are designated by the same reference numerals and redundant explanation will be omitted.

(L-milk) Since the power bar device according to the present invention has the content described above, it can be expected to have many effects, and the main effects are listed below.

(a) First of all, by arranging the wiper drive shaft on the outer edge of the windshield, it goes without saying that the problems of the type in which the wiper drive shaft is arranged inside the windshield can be avoided.

(b) The arm head of the wiper arm is formed separately into a first arm head for supporting the wiper blade and a second arm head for driving, and the rotational force is transmitted from the second arm head to the first arm head via a pin. Furthermore, by providing a gear part at the base of the first arm head and meshing it with a fixed gear arranged concentrically with the wiper drive shaft, the first arm head is connected to the second arm head via the pin. When rotating, be sure to use the pin as a fulcrum and bend.

The supported wiper blade can be positioned parallel to the corresponding side of the windshield at the end of its rotation, allowing it to rotate 180°.
This greatly contributes to the safe running and operation of vehicles in general, including cars.

(c) Also, the gear ratio between the gear part of the first arm head and the fixed guide gear, the shape of the windshield to which this wiper device is attached, especially the shape of the corresponding side, and the mounting position of the wiper drive shaft with respect to the corresponding side, etc. It is sufficient to select a bending degree so that the first arm head is always parallel to the corresponding side of the windshield at the end of rotation, so it is suitable for various types of windshields for general vehicles including automobiles. It has high versatility and can be adapted to various situations.

Furthermore, if the vibration absorber is combined with the fixed guide gear as in the second embodiment, it is easier to arrange the fixed guide gear concentrically with respect to the wiper drive shaft, and the engagement with the gear part of the first arm head is accordingly reduced. It is possible to make the bending state of the first arm head smooth, and the vibration caused by the meshing of the gears can be reduced, and even that small vibration can be absorbed. It's effective.

[Brief explanation of drawings]

FIG. 1 is an overall front view of a wiper device showing a first embodiment of the present invention. FIG. 2 is an enlarged perspective view of main parts of the wiper device shown in FIG. 1. FIG. 5 is a sectional view taken along the line indicated by the arrow "T" in FIG. FIG. 4 is a sectional view corresponding to FIG. 3 showing the second embodiment. FIG. 5 is a perspective view of the fixed guide gear shown in FIG. 4. FIG. 6 is an overall front view corresponding to FIG. 1 showing a conventional example. FIG. 7 is an enlarged perspective view of the main part corresponding to FIG. 2. Fig. MB is an overall front view corresponding to Fig. 6 showing another conventional example, and Fig. 9 is a partially enlarged perspective view of the mounting portion of the wiper device shown in Fig. 8. 1 Windshield 3 Wiper drive shaft 4 Wiper arm 5 Wiper blade A Wiping area 7.8 Corresponding side 30 Second arm head 32 Wiper arm 33 First arm head 40 Base of the first arm head 44 Pin 46 First arm head Gear part 47 Fixed guide gear 30 9 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] In a wiper device in which a wiper drive shaft is disposed at the outer edge of the windshield and a wiper blade is rotated by a wiper arm connected to the wiper drive shaft, the arm head of the wiper arm is connected to the wiper drive shaft. A first arm head for supporting the blade, and a second arm head for driving that is directly connected to the wiper drive shaft and pins the base of the first arm head, and a wiper drive arm is attached to the base of the first arm head. A wiper device comprising: a gear portion that meshes with a fixed guide gear arranged concentrically with a shaft; and a first arm head that is parallel to a corresponding side of a windshield at the end of rotation.