JPH0545464B2 - - Google Patents

Description

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

Conventional technology This type of automotive wiper wipers wipe away rain, mist, etc. that adheres to windshield glass such as windshields.
It consists of a wiper blade that directly wipes off substances such as snow, insects, mud, oil, and splashes from the vehicle in front, a wiper arm, a wiper link that transmits force to the wiper arm, and a wiper motor that is the drive source for the wiper blade. Common. 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, 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. Wiper arms 4 and 4' shown in FIGS. 8 to 10 are attached to the right end and approximately the center of the cowl top 2, respectively.

This wiper arm 4 includes an arm head 5 and an arm body 6, and this arm body 6 has a retainer 7.
and a stay 8 fixed to this. The retainer 7 of the arm body 6 is connected to the pivot 9
The arm head 5 is fixed to a pivot shaft 10. Incidentally, 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, the wiper blade 12 attached to the tip of the stay 8 is pressed against the windshield 3.

Incidentally, since the wiper arm 4' is constructed in the same manner, the same parts will be designated with dashed symbols and their explanation will be omitted.

Such a pair of wiper arms 4, 4' are interlocked with the wiper motor via a link mechanism so that they rotate integrally with the pivot shafts 10, 10' in the same direction and move in the same manner. 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
Since the wiper blades 12' move in sliding contact with the windshield 3 in the left-right direction, raindrops adhering to the windshield 3 are wiped away by the wiper blades 12, 12' in rainy weather.

Problems to be Solved by the Invention By the way, many windshields 3 of recent vehicles are curved in the left-right direction and downward direction.
Its curvature varies depending on location. Moreover,
The above-mentioned pivot shafts 10, 10' are shown in FIG.
As shown in FIG. 12, it is directed toward the normal lines 13 and 13' of the lower edge of the windshield 3. As a result, the distance between the planes 14, 14' on which the arm heads 5, 5' rotate and the surface of the windshield 3 gradually increases as the distance from the pivot axes 10, 10' increases. For this reason, wiper blade 1
The pressing force of the wiper arms 2 and 12' against the windshield 3 gradually decreases as the wiper arms 4 and 4' rotate from right to 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 arrow 1 in Figure 7.
As shown in 5, 16, 17, windshield 3
It flows upward and left and right on the top and heads backwards.
Therefore, when the wiper arms 4, 4' rotate 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'.

This kind of running wind blows the wiper blades 12, 12'
On the other hand, when there is a tailwind, the relative speed between the wind and the wiper blades 12, 12' becomes small, and the wind does not act as a displacement resistance for the wiper blades 12, 12'.
2 and 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 blades 12, 12' becomes greater than the speed of the wind, and the wind acts as a resistance to the displacement of the wiper blades 12, 12', causing the wiper blades to move against the wind. This becomes a force that lifts the blades 12, 12'. This displacement resistance increases as the vehicle speed increases. Therefore, when the wiper blades 12, 12' are exposed to a headwind when the vehicle is running at high speed, if the pressing force of the wiper blades 12, 12' against the windshield 3 is small, the wiper blades 12, 12'
The blade lifts up due to the wind pressure of the running 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'
Since the pressing force of the blade 2' against the windshield 3 is increased, the above-mentioned blade lifting phenomenon does not occur when the vehicle is running at high speed. However, 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 its vicinity, the above-mentioned blade There is a possibility that a floating phenomenon may occur.

When this blade lifting phenomenon occurs, the central part of the windshield 3 where this occurs is not sufficiently wiped away, and the forward visibility of this part is reduced. Furthermore, when driving at high speeds, where this blade lifting phenomenon is likely to occur, the driver's dynamic field of vision is also narrowed. There is a risk that this may cause problems.

Therefore, this invention aims to move the wiper blade toward the center of the windshield (i.e., toward the opposite direction from 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 even when the wiper blade is rotated.

Means for Solving the Problems In order to achieve this object, the present invention includes mounting a pivot shaft on the cowl top of a vehicle body with the pivot shaft facing forward, fixing an arm head to the pivot shaft, and attaching the arm body to the arm head. A wiper for an automobile, wherein the wiper blade of the arm body is pressed against the windshield by attaching the wiper blade of the arm body against the windshield by spring-biasing the arm body toward the windshield. As the wiper arm moves toward the lower edge of the windshield, the axis of the pivot shaft of the wiper arm, which is located closer to the steering handle than the center line, increases, the pressure of the wiper blade of the wiper arm against the windshield increases. An automobile tilted by a predetermined amount toward the center line in the width direction of the vehicle with respect to a normal plane of a portion of the lower edge of the windshield corresponding to the pivot shaft mounting position at an angle capable of resisting driving wind pressure. It is characterized by being a wiper for use.

Effect: 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 side rotates toward the center of the windshield during high-speed driving, the wiper blade will not lift up due to the wind pressure and will securely wipe the surface of the windshield. to dispel.

Embodiment Hereinafter, an 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. Wiper arms 4 and 4' shown in FIGS. 2 to 4 are attached to the right end and approximately the center of the cowl top 2, respectively.

This wiper arm 4 includes an arm head 5 and an arm body 6, and this arm body 6 has a retainer 7.
and a stay 8 fixed to this. The retainer 7 of the arm body 6 is connected to the pivot 9
The arm head 5 is fixed to a pivot shaft 10. Incidentally, the pivot shaft 10 is rotatably mounted on the cowl top 2. The axis of this pivot shaft 10 is 0, the lower edge of the windshield 3 is 3a, and the tangent of the lower edge 3a of the portion corresponding to the mounting portion of the pivot shaft 10 is S,
If the normal plane perpendicular to this tangent S is P, then the axis 0
is slightly inclined by a predetermined amount with respect to the normal plane P toward the center line C in the width direction of the vehicle (that is, the direction opposite to the side where the steering wheel H of the vehicle is provided). Moreover, if A is a plane that includes the arm head 5 of the wiper arm 4 and is perpendicular to the axis 0, then the distance between this plane A and the windshield 3 increases as it moves toward the center of the windshield in FIG. It is set to gradually become narrower. Further, a spring 11 is stretched between the pin 5a on the arm head 5 side and the stay 8, and this spring 11 is connected to the arm body 6.
is biased against the windshield 3 side by a spring. 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. 5A.

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 with 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 of the normal line 13'.

Such a pair of wiper arms 4, 4' are interlocked with the wiper motor via a link mechanism so that they rotate integrally with the pivot shafts 10, 10' in the same direction and move in the same manner.

In addition, in the embodiment described above, the pivot shaft 10
is slightly inclined towards the center of the vehicle, so when the arm body 6 and wiper blade 12 are at the center of the vehicle, the wiper blade 12 is inclined downward by γ with respect to the windshield 3 as shown in Fig. 5A. However, it is not necessarily limited to this configuration. For example, when the wiper blade 12 is in the vicinity of the inverted position on the center side in the vehicle width direction, the wiper blade 12 is moved so that the center line 12a of the wiper blade 12 is perpendicular to the surface of the windshield as shown in FIG. It is preferable to have a slightly twisted configuration between the blade 12 and the arm body 6. In this case, it is possible to reliably wipe the approximately center side of the windshield 3 where wiping failure is likely to occur.

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

When a wiper motor (not shown) is operated, the pivot shafts 10, 10' are rotated alternately clockwise and counterclockwise via links (not shown). As a result, the wiper arms 4, 4' are rotated together with the pivot shafts 10, 10'. Moreover, along with this, the wiper blades 12, 12' of the wiper arms 4, 4' are
The wiping portions are rotated from the right ends R, R' to the left ends L, L', or vice versa.

By the way, the distance between the plane A including the arm head 5 of the wiper arm 4 and the windshield 3 is the right end R.
It gradually becomes smaller from the side toward the left end L side. Therefore, when the wiper blade 12 is rotated from the right end R side to the left end L side as described above, the arm body 6 resists the spring force of the spring 11 and moves upward (+θ) around the pivot 9 in FIG. direction), the windshield 3 of the wiper blade 12
The pressing force gradually increases as shown by curve f in FIG. In the figure, the broken line f' is a curve showing the change in the pressing 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 side L when the vehicle is running at high speed, the wind generated by the vehicle runs against the wiper blade 12 and tries to lift the wiper blade 12.
Since the pressing force of the wiper 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 to the left, the blade pressing force decreases, but the traveling wind becomes a tailwind, so this traveling wind is transferred to the blade 1.
This becomes the force that presses 2'. Furthermore, when the wiper arm 4' rotates toward the vehicle center line C (from left to right), the blade pressing force increases.
Even if the traveling wind tries to lift the blade 12', the blade 12' does not lift up and reliably wipes the surface of the windshield 3.

As a result, the transmission of the portion of the windshield surface wiped by the wiper blades 12, 12' is not impaired.

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.

Effects of the Invention As explained above, the present invention has a pivot shaft attached to the cowl top of a vehicle body with the pivot shaft facing forward, an arm head fixed to the pivot shaft, and an arm body attached to the arm head that can be freely raised and lowered relative to the windshield. In the wiper for an automobile, the wiper blade of the arm body is pressed against the windshield by spring-biasing the arm body toward the windshield, at least at the side of the steering handle from the center line of the vehicle. The axis of the pivot shaft of the wiper arm installed in
As the wiper arm moves toward the lower edge of the windshield, the pressure of the wiper blade of the wiper arm against the windshield increases, so that the lower edge of the windshield is oriented at such an angle that it can resist the wind pressure when traveling. The wiper for automobiles is tilted by a predetermined amount toward the center line in the width direction of the vehicle with respect to the normal plane of the part corresponding to the pivot shaft mounting position, so that the wiper blade rotates toward the center of the windshield. In this case, the 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 the drawing]

FIG. 1A is a partial plan view of an automobile equipped with an automobile wiper according to the present invention, FIG. 1B is a partially enlarged view of FIG. 1, and FIG. 2 is an enlarged perspective view of the automobile wiper shown in FIG. 1A. Figure 3 is a partially cutaway side view of the automobile wiper shown in Figure 2, Figure 4 is a sectional view taken along the - line in Figure 3, and Figure 5A is a side view of the automobile wiper shown in Figure 2. 5B is a sectional view showing another installation state of the wiper blade shown in FIG. A pressing force characteristic curve diagram showing the relationship with the pressing force on the glass, 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 sectional view taken along the - line in FIG. 9, and FIG. FIG. 12 is a partial plan view of the automobile shown in FIG. 7, and is an explanatory diagram of the automobile wiper shown in FIG. 1... Vehicle body, 2... Cowl top, 3... Windshield, 3a... Lower edge, 4, 4'... Wiper arm, 5, 5'... Arm head, 6, 6'...
...Arm body, 9,9'...Pivot, 10,10'...
...Pivot axis, 11, 11'...Spring, 1
2, 12'... Wiper blade, A, A'... Plane, 0... Axis line, S... Tangent line, P, P'... Normal plane.

Claims (1)

[Scope of Claims] 1. A pivot shaft is attached to the cowl top of a vehicle body with the pivot shaft facing forward, an arm head is fixed to the pivot shaft, and an arm body is attached 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 arm body toward the windshield, at least the wiper arm provided on the steering handle side from the center line of the vehicle. The axis of the pivot shaft is set at an angle such that as the wiper arm moves toward the lower edge of the windshield, the pressing force of the wiper blade of the wiper arm against the windshield increases to resist the wind pressure when the vehicle is traveling. A wiper for an automobile, characterized in that the wiper is inclined by a predetermined amount toward the center line of the vehicle in the vehicle width direction with respect to the normal plane of the portion of the lower edge of the windshield corresponding to the pivot shaft mounting position. 2. Twist the wiper blade 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 near the inverted position on the center side in the vehicle width direction. The wiper for an automobile according to claim 1, characterized in that the wiper has a windshield.