JPH03231056A - Wiper device - Google Patents

Abstract

PURPOSE:To reduce the wiping-left dimension by constituting a pivot arm which is formed integrally with a pivot shaft on which a wiper arm is fixed, from two parts which are joined in slidable manner in the longitudinal direction and controlling the sliding operation according to the swing speed of the wiper arm. CONSTITUTION:In a wiper device, a pivot arm 18 is integrally installed through an installation seat 11 on a pivot shaft 7 on which the basic edge part of a wiper arm 15 is installed, and one edge of a link 12 which is reciprocatingly moved by the drive of a motor is pivotally installed at the other edge of the pivot arm 18. In this case, the pivot arm 18 is constituted of the first pivot arm 19 on the pivot shaft 7 installation side and the second pivot arm 21 having a nearly cylindrical form on the link 12 installation side into which the first pivot arm 19 is inserted. A worm gear 23 is revolved by a motor 25 which is revolved according to the output of a water droplet sensor, etc., and the second pivot arm 21 having the uneven dents 28 in meshing with the worm gear 23 is moved slidingly, and the total length of the pivot arm 18 is varied.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a wiper device, particularly a wiper device for automobiles.

<Prior Art> Examples of conventional wiper devices include those shown in FIGS. 5 and 6 (see Japanese Utility Model Application Publication No. 187549/1987).

In front of the front window glass 1 is an air box 2 defined by a cowl top panel. A wiper motor 4 is attached to the front face of the cowl top panel 3, and a rotary shaft 6 having a rotary arm 5 at its tip protrudes from the wiper motor 4 toward the inside of the air hox 2. On the other hand, on the center and right sides of the upper surface of the cowl top panel 3, a predetermined length 1.8 is supported at one end so as to be swingable about a pivot shaft 7.8. ．． The twelve pivot arms 9 and 10 are attached from the back side with a substantially triangular one-sun seat 11 at the pivot shaft 7.8 portion thereof. The other ends of the pivot arms 9 and 10 that are attached in this way, as well as the other end of the central pivot arm 10 and the tip of the rotary arm 5, are connected to links 12.1 and 12, respectively.
3 are connected. In addition, each pivot arm 9, l
The pivot shaft 7.8 of O is equipped with a wiper plate 14 manufactured by Com for wiping the front window glass l.
The proximal end 16 of the wiper arm 15 is fixed at its tip.

Therefore, when the wiper arm 4 is driven to rotate the rotary arm 5, each link 12.13 makes a constant reciprocating motion in accordance with the rotation of the rotary arm 5, and this reciprocating motion causes the pivot arm 9.10 to rotate. A wiper arm 15 which is swung left and right at the other end and fixed to a pivot shaft 7.8 is swung within a predetermined swing angle range θθ2, and water and dirt on the glass surface of the front window crow 1 are wiped away by the wiper plate 14. The swinging angle ranges θ1 and θ2 of the wiper arm 15 during the movement are determined by the link 12.13.
Reciprocating motion and length of pivot arm 9.10 1.1. IH
Determined by

<Problem to be solved by the invention> By the way, the front window glass 1 is wiped in certain wiping areas A and B by the two swinging wiper arms 5 with the structure as described above. A, B and the molding part 1 around the front window glass 1
7, as shown in FIG. 6, unwiped dimensions S, , S, , S3 of about 30 to 50 mm are inevitably left. This is because even if the wiper arm 15 is set to swing within a certain swing angle range, as shown in the table below, there may be some unwiped parts depending on the swing speed of the wiper arm 15 and the surface condition of the front window glass 1. Dimensions S1, S
3. S3 or change.

That is, when the swinging speed of the wiper arm 15 is fast, the momentum of the wiper arm 15 causes the unwiped size S], S,
, S3 tend to be small, and if the glass surface of the front window glass 1 is wet with rainwater, the resistance is small, so the remaining dimensions S1, S2, and S3 tend to be small. Therefore, in order to prevent the wiper arm 15 from colliding with the molding part 17 in any case, the wiper arm 15 has unwiped dimensions S and S2.
, S3 are set based on a state in which the swinging speed of the wiper arm 15 is fast and the glass surface is sufficiently wet.

However, since this is based on the case where the unwiped dimensions Sl, S2, and S3 are the smallest, when the swing speed of the wiper arm 15 is slow or when the glass surface is slightly wet, Unwiped dimensions S1, S2, S
3 becomes large, and the pillar side visibility from the driver's seat is narrowed (in the case of unwiped dimension S), or the forward visibility is narrowed (in the case of unwiped dimensions S1 and S2).

Furthermore, if the unwiped dimensions S1, S2, and S3 were large, the appearance would be poor.

This invention was made by paying attention to such conventional technology, and it is possible to always keep the surface of the windshield glass at a constant swing angle without being affected by the swing speed of the wiper arm or the wet state of the windshield glass. To provide a wiper device capable of wiping with a wiper arm without leaving anything unwiped.

Means for Solving the Problems> In order to achieve the above object, a wiper device according to the present invention includes a first pivot arm having a pivot shaft, and a first pivot arm having a longitudinal direction relative to the first pivot arm. a second link connection which is slidably engaged in the
a pivot arm, and the pivot arm senses the swing speed of the wiper arm or the wet state of the windshield glass surface, slides the second pivot arm relative to the first pivot arm, and controls the entire length of the pivot arm itself. It is assembled with a driving means for changing the.

Function> Since the second pivot arm can be slid with respect to the first pivot arm by the driving means and the entire length of the pivot arm itself can be changed, the swinging speed of the wiper arm can be fast and the front window glass surface can be adjusted according to the requirements. If the situation is detected, the entire length of the pivot arm can be lengthened (and the range of swing angle of the wiper arm can be reduced to avoid collisions with the wiper arm or the area around the windshield). On the other hand, if the swing speed of the wiper arm is slow and the front window glass surface is dry, you can sense this condition and shorten the overall length of the pivot arm to widen the swing angle range of the wiper arm. The size of the remaining area can be reduced.

Embodiment A preferred embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Incidentally, the same reference numerals are given to the parts that are the same as in the conventional art, and redundant explanation will be omitted.

18 is the pivot arm on the right side of the vehicle body according to this embodiment, and the pivot arm on the center side of the vehicle body (not shown) has the same structure as the pivot arm 18 on the right side of the vehicle body, so only this pivot arm 18 will be described below as a representative.

This pivot arm 18 includes a first pivot arm 19 having a pivot shaft 7 and a first pivot arm 19 having a pivot shaft 7 .
The second pivot arm 21 has a generally cylindrical shape and has an insertion hole 20 formed in the longitudinal direction for inserting the second pivot arm 9 and a link 12 connected to the other end. A notch 22 exposing the insertion hole 20 is formed on one side of the second pivot arm 21, and a rotatable worm gear 23 is pivotally supported in the notch 22. This worm gear 23 is equipped with a drive gear 24 at the end, and a second
It engages with a gear 27 at the end of a rotating shaft 26 of a drive motor 25 fixed to the side surface of the pivot arm 21. This drive motor 25 and worm gear 23
A driving means is formed. On the other hand, the first bihot arm 21 is slidably inserted into the insertion hole 20 of the second bihot arm 21.
Concave and convex teeth 28 are formed on corresponding sides of the pivot arm 19 to engage with the worm gear 23.

Therefore, by rotating the rotating shaft 26 of the drive motor 25 in the forward and reverse directions, the first pivot arm 19 relatively enters and exits the insertion hole 20 of the second pivot arm 21, and the pivot arm 18 The total length of can be changed.

The drive motor 25 is connected to a wiring 30 for transmitting a signal from a known water droplet sensor 29 (see Japanese Utility Model Application Publication No. 124359/1983) attached to a corner of the front window glass (window glass) 1, and a wiper motor. The drive motor 25 is connected to a wiring 31 that transmits the output state (oscillation speed) as a signal, and the drive motor 25 rotates by a certain amount in response to signals from these wirings 30 and 31.

Specifically, the swing angle range θ3 of this wiper arm 15
, θ, are set based on the case where the swinging speed of the wiper arm 15 is “slow J” and the surface condition of the front window glass l is “dry”. When the wiper arm 1 is close to the
Only the entire length of the pivot arm 18 is determined in advance so that the pivot arm 5 swings. Front window glass 1 or “dry”
This is because even in non-rainy conditions, when the water droplet sensor 29 does not detect rainwater, the wiper arm 15 may wipe off dust, mud, insects, etc. adhering to the front surface of the front window glass 1. In this way, the swing angle range θ3 is large so that there is almost no unwiped dimension.
Since the wiper arm 15 is swung by θ, the wiping areas C and D are also enlarged by the shaded area R in the figure compared to the conventional wiper, which is advantageous for safe driving because the field of view is enlarged.

When it rains and the surface of the front window glass 1 becomes wet, or when the swinging speed of the wiper arm 15 is increased due to heavy rainfall, the wiring from the water droplet sensor 29 30 and the wiring 31 from the wiper motor 4, the signal is transmitted to the drive motor 25 as a signal, and the rotary shaft 26 is rotated by a predetermined amount in the normal rotation direction. Then, due to the engagement between the rotating worm gear 23 and the uneven teeth 28, the pivot arm 18 is slid by a predetermined amount so as to be sent outward from the insertion hole 20 of the first pivot arm 19 or the second pivot arm 21.
The total length of increases. When the total length of the pivot arm 18 increases, the amount of reciprocating movement of the link 12 is constant, which would normally reduce the swing angle range of the wiper arm 15, but the surface of the front window glass 1 becomes wet. Or, because the swinging speed of the wiper arm 15 is fast, the swinging angle ranges θ3 and θ4 are the same as when the full length of the pivot arm 18 is short, and collision of the wiper arm 15 with the molding part 17 is prevented. At the same time, the wide wiping area C1D can be maintained as it is.

FIG. 4 is a diagram showing another embodiment of the present invention.

In this embodiment, instead of controlling the drive motor 25 using signals from the water droplet sensor 29 and the wiper motor 4, touch sensors are placed on the molding part 17 of the front window glass 1 at three positions where the tip of the wiper plate 14 may collide. 32 are arranged respectively. This touch sensor 3
2 are each connected to a drive motor 25, and when the tip of the wiper arm 15 touches the touch sensor 32, a signal is sent to the drive motor 25. The swing angle range θ3 of this wiper arm 15,
As in the previous embodiment, θ4 is based on the case where the swing speed of the wiper arm 15 is "slow" and the surface condition of the front window glass 1 is "dry", and even in such a state, a large wiping area C1D can be covered. It is now possible to obtain it. When it rains and the surface of the front window glass 1 becomes wet, or when the swinging speed of the wiper arm 15 is increased due to heavy rainfall, the swinging angle range increases and the wiper arm 15 comes into contact with the touch sensor 32.

When the tip of the wiper arm 15 contacts the touch sensor 32, this is transmitted as a signal to the drive motor, and the drive motor 25 is driven to lengthen the entire length of the pivot arm 18 and change the swing angle range. Control expansion.

Therefore, it is possible to prevent the wiper arm 15 from colliding with the molding part 17 afterward, and to maintain the wide wiping areas C and D as they are. In addition, once the wiper device of this embodiment is turned off, the swing speed of the wiper arm 15 is changed to "
It is supposed to start from a reference state in which the surface condition of the front window glass 1 is "dry".

Other configurations and effects are the same as in the previous embodiment,
Omit duplicate explanations.

<Effects of the Invention> Since the wiper device according to the present invention has the content as described above, it can always keep the surface of the windshield at a constant level without being affected by the swinging speed of the wiper arm or the surface of the windshield. Wiping can be done without leaving any residue in the swinging angle range. Therefore, the field of view of the front window glass is expanded, which is favorable for safe driving.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a pivot arm of a wiper device according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line indicated by the arrows ■-■ in Fig. 1, and Fig. 3 is a wiping area of the front window glass. 4 is a side view corresponding to FIG. 3 showing another embodiment of the present invention, FIG. 5 is a perspective view showing a conventional wiper device, and FIG. 6 is a front view of a conventional wiper device. FIG. 4 is a side view corresponding to FIG. 3 showing the wipe area of the window glass. 1 Front window glass (window glass) 4 Wiper motor 5 - - 1 Rotating arm 7.8 - Pivot shaft 12.13 - Links 1, 5 ---- Wiper arm 8 19 1 3 5 θ4 Pivot arm 1st Pivot arm 2nd pivot arm worm gear drive motor swing angle range Fig. 2 Fig. 3

Claims (1)

[Claims] A link reciprocatingly driven by a motor is connected to a pivot arm that is swingable about a pivot shaft, and a wiper arm for wiping a window glass fixed to the pivot shaft is connected to the reciprocating motion of the link. In the wiper device that swings within a predetermined swing angle range, the pivot arm includes a first pivot shaft having a pivot shaft.
It consists of a pivot arm and a second pivot arm for link connection that is slidably engaged in the longitudinal direction with respect to the first pivot arm, and the pivot arm is provided with a swing speed of the wiper arm or a window glass surface. sensing a wet condition and sliding the second pivot arm relative to the first pivot arm;
A wiper device characterized in that a driving means for changing the overall length of the pivot arm itself is assembled.