JPS61125953A - Automobile wiper - Google Patents

Abstract

PURPOSE:To prevent a wiper blade from floating up by wind due to the running of a car by allowing the wiper blade to be strongly pressed toward a front glass as it is swung toward the center of the front glass. CONSTITUTION:A wiper arm 4 includes an arm head 5 and an arm in itself 6, and the arm in itself 6 is composed of a retainer 7 and a stay 8 fixed on the reatiner. If a shaft axis of a pivot axis 10, on which the arm head 5 is fixed, is called '0', and if the lower edge of a front glass 3 is called '3a', and if a tangent to a section of the lower edge 3a which is correspondent to the installation point of the pivot 10, is called 'S', and also if a normal plane which is normal to the above said tangent, is called 'P', the shaft axis '0' is allowed to be somewhat tilted against the normal plane 'P' by the angle of B toward the center line of a car. And if a plane which is normal to the shaft axis '0' including the arm head 5 of the wiper arm 4 is called 'A', the distance between the plane 'A' and the front glass 3 is set in such a manner that it becomes more narrow as it comes up near tot he center of the front glass.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an automobile wiper used for wiping away raindrops etc. adhering to the windshield of an automobile.

Conventional technology This type of automotive wiper consists of a wiper blade that directly wipes off substances such as rain, fog, snow, insects, mud, oil, and splashes from the vehicle in front that adhere to the windshield glass such as a windshield, and a wiper arm that touches the wiper blade. , a wiper link that transmits force to the wiper link, and a wiper motor that is the drive source for the wiper link. Furthermore, among such wipers for automobiles, tandem type wipers in which two wiper blades move in the same direction are most widely used.

FIG. 7 shows an example.

In FIG. 7, ■ is a car body, 2 is a cowl top on the side of the car body 1, and 3 is a windshield (windshield glass) attached to the front window of the car body l.

Figures 8 to 10 are shown at the right end of the cowl top 2 and approximately at the center.
The wiper arms 4 and 4' shown in the figure are respectively attached.

This wiper arm 4 includes an arm head 5 and an arm body 6.
The arm body 6 is composed of a retainer 7 and a stay 8 fixed to the retainer 7.

The retainer 7 of the arm body 6 is pivotally connected to the arm head 5 via a pivot 9, and the arm head 5 is fixed to a pivot shaft 10. Note that the pivot shaft 10 is rotatably mounted on the cowl top 2. Further, a spring 11 is stretched between the arm head 5 and the stay 8, and this spring 11 biases the arm body 6 toward the windshield 3 side. As a result, stay 8
A wiper blade 12 attached to the tip of the windshield 3 is pressed against the windshield 3.

Incidentally, since the wiper arm 4' is similarly constructed, the same parts are designated by dashed symbols and their explanations will be omitted.

Such a pair of wiper arms 4, 4' are connected to the pivot shaft 1.
It is interlocked with the wiper motor via a link mechanism so that it rotates in the same direction as 0.10' and moves in the same way. Therefore, when the wiper motor is operated, the wiper arms 4 and 4' synchronously swing (rotate) in the left and right directions, and the wiper blades 12 and 12' move in the right and left directions on the windshield 3, so that when it rains, windshield 3
Raindrops adhering to the windshield are wiped away by wiper blades 12, 12'.

By the way, the windshields 3 of many modern vehicles are curved in the horizontal and vertical directions, and the curvature differs depending on the location. Moreover, the above-mentioned pivot axes 10 and 10' are oriented in the direction of the normal line 13° and 13' of the lower edge of the windshield 3, as shown in FIGS. 11 and 12.・Arm 1 arm head 5,
5' rotating plane 14.14' and windshield 3
The distance from the surface to the surface becomes gradually larger as the distance from the pivot axis to, to' increases. Therefore, the pressing force of the wiper blades 12, 12' against the windshield 3 gradually decreases as the wiper arms 4, 4' rotate from the cloth to the left in FIG.

On the other hand, when the vehicle is running, the windshield 3 receives wind from the vehicle. This running wind is indicated by the arrows 15°16, 17 in Figure 7.
As shown in , it flows upward and left and right over the windshield 3 and heads toward the rear. For this reason, wiper arm 4,
When the wiper blade 4' rotates to the right in FIG. 11, the traveling wind becomes a tailwind for the wiper blade 12 and a headwind for the wiper blade 12'. Further, when the wiper arms 4, 4' rotate in the opposite direction, the traveling wind becomes a head wind against the wiper blade 12 and a tail wind against the wiper blade 12'.

When such a traveling wind is a tailwind for the wiper blades 12, 12', the traveling wind and the wiper blades 12, 12'
2' becomes smaller, and the traveling wind does not act as a displacement resistance of the wiper blade 12.12', so that the traveling wind becomes a force that presses the wiper blade 12.12' against the windshield 3.

On the other hand, when the wind is against the wind, the relative speed between the wind and the wiper blade 12.12' becomes greater than the speed of the wind, and the wind blows against the wiper blade 12.12'.
12' displacement resistance and wiper blade 12.12'
It becomes the force that makes it stand out. This displacement resistance increases as the vehicle speed increases. Therefore, if the wiper blades 12, 12' are hit by a headwind while the vehicle is running at high speed,
If the pressing force of the wiper blade 12.12' against the windshield 3 is small, the wiper blade 12.12' will be lifted up by the wind pressure of the traveling wind, resulting in a blade lifting phenomenon.

In reality, when the wiper blade 12 or 12' is directed toward the center of the windshield 3, it creates a headwind. Moreover, when the wiper blade 12' moves toward the center of the windshield 3, the wiper blade 12' moves toward the center of the windshield 3.
Since the pressing force on the blade increases, the above-mentioned blade lifting phenomenon does not occur when the vehicle is running at high speed. but,
When the wiper blade 12 on the driver's seat side moves toward the center of the windshield 3, the pressing force of the wiper blade 12 against the windshield 3 becomes smaller as described above. As a result, when the wiper blade 12 is directed towards the center of the windshield 3 when the vehicle is running at high speed, when the wiper blade 12 reaches the center part of the windshield 3 and the part near it, the blade as described above There is a possibility that a floating phenomenon may occur.

When this blade lifting phenomenon occurs, the portion of the middle end of the windshield 3 where this occurs is not sufficiently wiped away, and the forward visibility of this portion is reduced. Moreover, when driving at high speeds, this blade lifting phenomenon is likely to occur.
Since the driver's dynamic field of view is also narrowed, when the blade lift phenomenon occurs, the transmission through the windshield surface becomes poor, further reducing the visibility and potentially interfering with driving.

Therefore, the present invention provides that even when the wiper blade rotates toward the center of the windshield (i.e., in the opposite direction to the side where the steering wheel of the vehicle is provided),
It is an object of the present invention to provide a wiper for an automobile in which the pressing force of the wiper blade against the windshield is reduced and the blade lifting phenomenon does not occur.

In order to achieve this purpose of determining the distance, the present invention has a pivot shaft attached to the cowl top of the vehicle body with the pivot shaft facing forward.

An arm head is fixed to the pivot shaft, an arm body is attached to the arm head so that it can be raised and lowered with respect to the windshield, and the arm body is biased by a spring toward the windshield. In a wiper for an automobile in which a wiper blade is pressed against a windshield, an axis of a pivot shaft of a wiper arm provided at least closer to a steering handle than a centerline of the vehicle is positioned at a mounting position of the pivot shaft at a lower edge of the windshield. The wiper for an automobile is characterized by being inclined slightly toward the center line of the vehicle (that is, in the opposite direction to the side where the steering wheel of the vehicle is provided) with respect to the normal plane of the corresponding portion. be.

According to this configuration, as the wiper blade rotates toward the center of the windshield, the pressing force of the wiper blade against the windshield increases. As a result, even if the wiper blade on the driver's seat side rotates toward the center of the windshield when driving at high speed, the wiper blade does not lift up due to the wind pressure and can reliably wipe the surface of the windshield. do.

1] Takumi Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 6.

In FIG. 1, 1 is a car body, 2 is a cowl top on the side of the car body 1, and 3 is a windshield (windshield glass) attached to the front window of the car body 1. Figures 2 to 4 are shown on the right end of the cowl top 2 and approximately on the middle part.
The wiper arms 4 and 4' shown in the figure are respectively attached.

This wiper arm 4 includes an arm head 5 and an arm body 6.
The arm body 6 is composed of a retainer 7 and a stay 8 interposed therebetween.

The retainer 7 of the arm body 6 is pivotally connected to the arm head 5 via a pivot 9, and the arm head 5 is fixed to a pivot shaft 10. Note that the pivot shaft 10 is rotatably mounted on the cowl top 2. This pivot axis 1
The axis 0 is It is slightly inclined by β with respect to the normal plane P toward the center line C of the vehicle (that is, in the direction opposite to the side where the steering wheel H of the vehicle is provided).

It includes the arm head 5 of the wiper arm 4, and the axis go
Assuming that A is a plane perpendicular to the windshield 3, the distance between the plane A and the windshield 3 is set to become gradually narrower toward the center of the windshield in FIG.

Further, a spring 11 is stretched between the pin 5a on the arm head 5 side and the stay 8.
1 has a spring biasing arm body 6 toward the windshield 3 side. As a result, the wiper blade 12 attached to the tip of the stay 8 is pressed against the windshield 3. In the state shown in FIG. 1, the wiper blade 12 is slightly inclined downward by γ as shown in FIG. 5(a).

Further, the wiper arm 4' may be configured in the same manner as in the conventional wiper arm, and the same parts will be designated by dashed symbols and their explanation will be omitted. In this case, the axis of the pivot shaft 10 supporting the wiper arm 4' is naturally directed in the direction 4!13'.

Such a pair of wiper arms 4, 4' are connected to the pivot shaft 1.
It is interlocked with the wiper motor via a link mechanism so that it rotates in the same direction as 0.10' and moves in the same way.

In the embodiment described above, the pivot shaft 10 is slightly inclined toward the center of the vehicle, so that when the arm body 6 and the wiper blade 12 are at the center of the vehicle, the wiper blade 12 is tilted as shown in FIG. 5(A). Although it is inclined downward by γ with respect to the windshield 3 as shown in FIG.

It is not necessarily limited to this configuration. for example,
When the wiper blade 12 is located at the center of the vehicle gap, the wiper blade 12 and the arm body 6 are aligned so that the center line 12a of the wiper blade 12 is perpendicular to the surface of the windshield as shown in FIG. 5(b). It is best to have a slightly twisted configuration between the two. In this case.

The approximate center side of the fluorocarbon 1 and the glass 3, where wiping failure is likely to occur, can be reliably wiped.

Next, the operation of the automobile wiper having such a structure will be explained.

When the wiper motor (not shown) is operated, pivot axis 1
0.10' is rotated alternately clockwise and counterclockwise via a link (not shown). As a result, the wiper arms 4, 4' are rotated together with the pivot shafts 10, 10'. Moreover, along with this, the fiber blades 12, 12' of the wiper arms 4, 4' are moved from the right end R, R' of each wiping part of the windshield 3 to the left end, L,
' or vice versa.

Incidentally, the distance between the plane A including the arm head 5 of the wiper arm 4 and the windshield 3 gradually becomes smaller from the right end R side toward the left end side.

Therefore, when the wiper blade 12 is rotated from the right end R side to the left end side as described above, the arm main body 6 resists the spring force of the spring 11 and moves upward (100°) around the pivot shaft 9 in FIG. direction), the pressing force of the wiper blade 12 against the windshield 3 gradually increases as shown by curve f in FIG. In the figure, i1f' is a curve showing the change in the suppressing force of the conventional wiper blade against the windshield.

As a result, when the wiper blade 12 moves from the right end R to the left end when the vehicle is running at high speed, the wind from the vehicle becomes a headwind against the wiper blade 12 and tries to lift the wiper blade 12; Since the pressing force of the blade 12 against the windshield 3 is also increased, the wiper blade 12 will not be lifted up by the wind while driving.

On the other hand, when the wiper arm 4' rotates from the right side to the left side, the blade pressing force decreases, but since the traveling wind becomes a tail wind, this traveling wind becomes a force that presses the blade 12'. Furthermore, when the wiper arm 4' rotates toward the vehicle center line C (from the left to the right), the blade pressing force increases, so even if the wind tries to lift the blade 12', the blade 12'' reliably wipes the surface of the windshield 3 without floating.

As a result, the wiper blade 12 on the windshield surface
．． Transmission of the area wiped by 12' is not deteriorated.

In the embodiments described above, the present invention is applied to a right-hand drive vehicle, but the present invention can also be applied to a left-hand drive vehicle.

3. Lesson 3 - As explained above, in this invention, the pivot shaft is attached to the cowl top of the vehicle body with the pivot shaft facing forward, the arm head is fixed to the pivot shaft, and the arm body is attached to the windshield. By attaching the arm body to the front crow side so as to be able to raise and lower it freely,
In the automobile wiper in which the wiper blade of the arm body is pressed against the windshield and numbered, the axis of the pivot shaft of the wiper arm provided at least on the steering handle side from the center line of the vehicle is aligned with the lower edge of the windshield. A wiper for an automobile is tilted slightly toward the center of the vehicle (i.e., in the opposite direction to the side where the steering handle of the vehicle is provided) with respect to the normal plane of the portion corresponding to the pivot shaft mounting position of the portion. So,
When the wiper blade rotates toward the center of the windshield, the pressing force of the wiper blade against the windshield increases. As a result, even if the wiper blade rotates toward the center of the windshield during high-speed driving, the blade lifting phenomenon can be reliably prevented from occurring, and a reduction in driving visibility can be prevented.

[Brief explanation of drawings]

Figure 1 (A) is a partial plan view of an automobile equipped with an automobile wiper according to this invention; Figure 1 (A) is a partially enlarged view of Figure 1; An enlarged perspective view of an automobile wiper, FIG. 3 is a partially cutaway side view of the automobile wiper shown in FIG. 2, and FIG. 4 is an enlarged perspective view of the automobile wiper shown in FIG.
A cross-sectional view along the V-IV line, Figure 5 (A) is the ■- in Figure 1.
■A cross-sectional view taken along the line, Figure 5 (b) is the same cross section showing the other installation state of the wiper blade shown in figure 5 (a). Figure 6 shows the position of the wiper blade shown in figure 1 and its position. FIG. 7 is a perspective view of an automobile equipped with a conventional automobile wiper;
FIG. 8 is an enlarged perspective view of the automobile wiper shown in FIG. 7;
Fig. 9 is a partially cutaway side view of the automobile wiper shown in Fig. 8, Fig. 10 is a cross-sectional view taken along line X-X@ in Fig. 9, and Fig. 11 is the view shown in Fig. 7. FIG. 12 is an explanatory diagram of the automobile wiper shown in FIG. 7. 1...Vehicle body, 2...Cowl top, 3
... Windshield, 3a... Lower edge, 4.4'.
...Wiper arm, 5.5'...Arm eight, de. 6.6'...Arm body, 9,9'...Pivot. 10, 10'...Pivot axis, 11.11'...
・Spring, 12.12'...wiper blade. A, A'...plane, 0...axis line. S...Tangent line, P(P')...Normal plane. Figure 5 (a) Figure 5. . ) Figure 6) R (R") Figure 7

Claims (2)

[Claims] (1) Attach the pivot shaft to the cowl top of the vehicle body with the pivot shaft facing forward, fix the arm head to the pivot shaft, and attach the arm body to the arm head so that it can be raised and lowered with respect to the windshield. In a wiper for an automobile, the wiper blade of the arm body is pressed against the windshield by spring-biasing the body toward the windshield, and the pivot of the wiper arm is provided at least closer to the steering handle than the center line of the vehicle. A wiper for an automobile, characterized in that the axis of the shaft is slightly inclined toward the center line of the vehicle with respect to the normal plane of a portion of the lower edge of the windshield corresponding to the pivot shaft mounting position. (2) The wiper blade is twisted relative to the arm body so that the center line of the wiper blade is perpendicular to the surface of the windshield at least when the wiper blade is on the center side of the vehicle. An automatic wiper according to claim 1.