JPH052539B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vehicle wiper device for wiping the window surfaces of vehicles such as passenger cars, buses, and trucks.

[Prior Art and Problems to be Solved by the Invention] Today, in some wiper devices of this type, the lower reversal position (starting position) of the wiper arm is located at a lower position away from the necessary wiping area of the blade, so that the wiper Some devices are known in which the blades are not visible from inside the vehicle when not in operation. However, if you do this, when it snows, the snow that accumulates on the window surface may get in the way and prevent the blade from descending to the lower inverted position, which may prevent smooth wiping operation. This poses problems such as overloading the links and motors and causing damage.

By the way, the wiper device swings the wiper link back and forth based on the forward and backward movement of the drive side link by a predetermined width based on the drive of the wiper motor, thereby swinging the wiper arm between the vertically inverted positions. , to displace the bottom inversion position upward,
It has been proposed to increase the link length of the wiper link to reduce the swing angle of the wiper arm, but simply increasing the link length will cause the upper inverted position to shift downward and reduce the wiping range at the upper inverted position. There is a problem of shrinkage.

For example, as shown in Japanese Utility Model Application Publication No. 60-51164, the wiping range of the blade is configured so that the upper inverted position remains the same and only the lower inverted position can be adjusted up and down. There is an attempt to avoid the above-mentioned obstacles caused by snow by setting the height upward. However, in this case, in order to switch to the lower reversed position, the wiper arm must be placed in the upper reversed position where there is no relative change before and after switching. However, the wiper device is equipped with an arm return mechanism that automatically returns the wiper arm to the downward inverted position when the wiper switch is turned off. To stop the ignition in the reverse position, turn the ignition switch while watching the oscillating timing.
Either it must be turned OFF or a new upper inversion position stop mechanism must be installed.In the former case, the operation becomes complicated and troublesome, and in the latter case, the structure becomes complicated. A different issue arises.

[Means for Solving the Problems] The present invention was created in view of the above-mentioned circumstances with the aim of providing a wiper device for a vehicle that can eliminate these drawbacks.
The base end of the wiper link, which is operatively connected to the support shaft of the wiper arm on which the blade is attached, is pivotally connected to the body side, and the tip end is pivotally connected to the drive side link, which is operatively connected to the wiper motor side, to drive the wiper motor. In the wiper device, the wiper arm is configured to swing back and forth between up and down reversed positions based on forward and backward movement of a drive side link over a predetermined width, the wiper link having a wiper arm support shaft formed in the wiper link. Based on the fact that it passes through the elongated hole-shaped guide so as to be movable in the elongated direction, the link length from the wiper arm support side pivot position to the drive side link pivot position is adjusted so that the wiper arm is in the downward inverted position. link length adjustment means that can switch to the snowfall specification side, where the wiper arm swing angle is reduced from the normal specification in both the up and down reversed positions, and the link arm side and wiper arm support shaft. and a wiper arm spindle rotating means for forcibly rotating the wiper arm spindle toward the upper reverse position in conjunction with the adjustment switching to the snowfall specification side based on the meshing of the gear portions formed on the side; Furthermore, the wiper arm spindle rotation means offsets the reduction in the swing angle of the wiper arm at the top inversion position due to the forced rotation angle of the wiper arm spindle being adjusted and switched to the snowfall specification. The wiper arm top inversion position in the snowfall specification condition is set to substantially match the wiper arm top inversion position in the normal specification condition.

According to the present invention, with this configuration, the lower reversed position of the wiper arm can be switched up and down extremely easily without changing the upper reversed position.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a wiper motor, and a link arm 1a provided on a drive shaft of the motor 1 has a base end portion of a link rod 2 pivotably connected thereto. The tip of the link rod 2 is pivotally connected to a joint ball 3a provided at one end of a wiper link 3, and the left and right wiper links 3 are operatively connected by a connecting link 4.

On the other hand, the wiper arm 6 to which the blade 5 is attached is integrally fixed to a support shaft 8 that is rotatably supported by a bracket 7 that is integrally fixed to the vehicle body. Due to the reciprocating rotation of the wiper arm 6, the wiper arm 6 swings back and forth between a lower inverted position and an upper inverted position, and the blade 5 wipes the window surface. This support shaft 8 is
As shown in the figure, the wiper link 3 passes through an elongated guide 3b formed in the wiper link 3 so as to be movable in the elongated direction, so that the wiper link 3 can be moved in a state in which the wiper arm is in the downward inverted position. , spindle 8
The link length L up to the joint ball 3a position, which is the drive-side link pivot position, is adjusted to be longer by the distance A, with the position as a reference. At the inverted position side, adjustment can be switched to the snowfall specification side where the angle is reduced by an angle γ/2, and in this way, the link length adjusting means is configured.

Further, an internal gear 3c is integrally formed on the wiper arm 6 side surface of the wiper link 3, and an external gear 8a that meshes with the internal gear 3c is integrally provided on the support shaft 8. . Then, as the wiper link 3 is guided by the guide 3b and moves to the side where the link length L becomes longer by the distance A, the external gear 8a receives relative gear feeding by the internal gear 3c. As a result, the support shaft 8 is forcibly rotated toward the upper inversion position, which causes the link length L to be lengthened by the distance A. A wiper arm support shaft rotating means is configured to forcibly rotate the support shaft 8 toward the upper inversion position.

Next, regarding the relationship between the link length adjustment length A and the forced rotation angle of the support shaft by the support shaft rotation means, the third
This will be explained in detail using FIG. Here, the swing width of the ball joint 3a of the wiper link 3 due to the drive of the motor 1 is assumed to be F, but strictly speaking, this width F changes slightly by adjusting the link length L. However, since it changes only to a negligible extent, there is no practical problem, and it is assumed to be constant here.

The normal specification state is when the link length is short, that is, when the spindle 8 is located on the ball joint 3a side of the guide 3b. When the wiper link 3 and the wiper arm 6 reciprocate within the range of the width F, the wiper arm 6 and the wiper arm 6 reciprocate within the range of the angle α to perform the wiping operation. On the other hand, in the case of a snowfall specification in which the link length L is long, that is, the spindle 8 is located far from the ball joint 3a of the guide 3b, in the range of the swing width F, the wiper link 3 is in the range of the angle β. Therefore, the angle γ is smaller (that is, α = β + γ) compared to the normal specification with a short link length, but this angle γ is smaller than the angle (γ /2)
angle (γ/
2) is evenly divided so that it is on the lower side.

On the other hand, as mentioned above, in conjunction with the snowfall specification, the support shaft 8 will be forced to rotate, but at this time, the lower reversal position of the wiper arm 6 will be displaced upward by γ. In order to force the rotation of the support shaft 8, the wiper arm 6 only needs to be further displaced by an angle (γ/2) toward the upper inverted position, and if this is set as the lower inverted position for the snowfall specification, the corresponding The lower inversion position is determined by the angle change (γ/
2) and the angle change (γ/2) due to the rotation of the spindle, that is, the upper inversion position is shifted upward by the angle γ, and the upper inversion position is shifted downward by the angle (γ/2) due to link length adjustment. , is offset by the upward angle change (γ/2) due to the forced rotation of the support shaft 8, so that when the wiper arm 6 is set to the snowfall specification, the upward inversion position is approximately the same as the normal specification. However, the lower inverted position is changed upward by an angle γ.

We will further examine these relationships in detail.
Here, when L is the link length in the normal specification, the swing width F of the wiper link 3 remains constant even if the link length is adjusted, and in the case of the normal specification, F/2=Lsin(α/ 2) holds true, and in the case of snowfall specifications, the formula F/2=(L+A)sin(β/2) holds true. Here, α=β+γ, and from the formula, Lsin(α/2)=(L+A)sin(β/2) Lsin(α/2)=(L+A)sin{(α−γ)/2} A= [{Lsin(α/2)}/sin{(α−γ)/2}
]
-L, and thus the distance A for link length adjustment is calculated.

On the other hand, the amount of rotation of the support shaft 8 when the link length is adjusted will be considered, and this can be done by calculating the diameter of the external gear 8a. First, when the support shaft 8 moves by A, the diameter of the external gear 8a is set to R, and in order to forcibly rotate the support shaft by an angle (γ/2), the following formula, A = {2πR (γ/2)}/360 holds true. From this formula, R=360A/πγ, and by substituting the value A calculated by the above formula, the diameter R can also be calculated.

In the embodiment of the present invention configured as described above, in the normal specification, the link length from the drive-side link pivot position 3a of the wiper link 3 to the support shaft 8 position is adjusted to the shorter side. In this state, the wiper arm 6 swings over a wide range of angles α to perform a wiping operation. On the other hand, when the link length is adjusted to be longer by A in order to achieve specifications for snowfall, the actual swing angle of the wiper arm 6 becomes narrower by the angle (γ/2) at the vertically inverted position, as described above. However, due to the action of the spindle rotation means at this time, the spindle 8 is forcibly rotated further by an angle (γ/2) toward the upper inversion position, and the spindle 8 is narrowed at the upper inversion position. To offset the reduced wiping angle, the lower inverted position is displaced upward by the angle γ, while the upper inverted position is switched to a state where there is no substantial displacement. Therefore, if the wiping operation is performed in this state, the blade 5 will perform wiping with the lower inversion position displaced upward by γ compared to the normal specification, and malfunctions due to snowfall can be avoided, and the motor and Damage to links etc. can be reliably avoided.

Moreover, in order to switch the specifications of this thing,
The simple operation of simply adjusting the link length is sufficient.
There is no need to take the trouble of stopping the wiper arm 6 at the upper inverted position as in the conventional case, and the wiper arm 6 can be quickly and reliably stopped in the lower inverted position. In reality, the link length adjustment is performed using the relative support shaft 8 with respect to the wiper link 3.
Since it is a position adjustment, it is sufficient to grasp the wiper arm 3 and swing it to the upper inverted position for the snowfall specification, and to the lower inverted position for the normal specification. become.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, but in this case, if the link length is adjusted to be longer to make the snowfall specification, the wiper arm swing angle will be different from the normal specification. The angles that are reduced at both the upper and lower inverted positions are not limited to equal angles as in the embodiment described above, but can also be reduced by the angle γ ₂ that should be offset at the upper and lower inverted positions, as in another example shown in FIG.
It is not necessarily necessary that the swing change angle γ ₁ of the link, which has become narrower due to the lengthening of the link, coincides with each other, and they may not match (γ ₁ ≠ γ ₂ ); As long as they approximately match, there is virtually no problem.

Furthermore, the wiper arm can of course be implemented by increasing its swing angle so as to widely wipe both left and right areas of the wiper arm's support shaft.In this case, the lower inverted position is It goes without saying that this is the reversing position on the side where starting and stopping of the engine is performed, and the upper reversing position is the reversing position on the opposite side.

Furthermore, in carrying out the present invention, when the wiper is operated, the link length adjustment of the wiper link and the forced rotation of the wiper arm support shaft must be linked and performed in an integrated manner. Therefore, it is preferable to reliably control unnecessary displacement of the support shaft. Various means can be considered for this purpose, but it can also be done by a simple structure of inserting and removing a pin. 7
As shown in the figure, the pin 9 is interlocked with a lever 6a provided on the wiper arm 6 via a wire 10, so that when changing specifications, the lever 6a can be operated at the same time as the wiper arm 6 is gripped to release the lock. If you do so, it will be convenient as it will further improve the operability.

[Operations and Effects] In summary, since the present invention is constructed as described above, when it is desired to use it for snowfall, the length of the link from the drive-side link pivot position of the wiper link to the wiper arm support-side pivot position can be changed. The actual swing angle of the wiper arm is narrowed by adjusting the link length to the longer side, which narrows the actual swing angle of the wiper arm. However, the wiper arm spindle rotation means connected to this makes it possible to adjust the upper inversion position due to the longer link length. The reduction in the swing angle of the wiper arm on the side is canceled out, and the wiper arm top inversion position in the long link length state is automatically displaced so as to substantially match the wiper arm top inversion position in the short link length state.

As a result, the wiper arm is displaced upward in the lower inverted position due to the effects of both the longer link length and the rotation of the spindle, and in the upper inverted position due to the longer link length. The effect of downward displacement is offset by the automatic rotation of the wiper arm spindle linked to the longer link length, so that the wiper arm upper inversion position in the snowfall specification becomes the wiper arm in the normal specification. It will automatically almost match the upper inverted position, and therefore, even if the lower inverted position is moved upward to prevent snowfall, the problem that the wiping range on the upper inverted position side will become narrower will definitely be avoided. It can be avoided.

Moreover, the specification change to prevent the wiping range from becoming narrow in the upper inverted position does not require stopping the wiper arm in the upper inverted position each time as in the past, but it is automatically stopped when the wiper switch is turned off. The link length can be easily adjusted by adjusting the link length while the link is in the desired position, resulting in a significant improvement in work efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the wiper device for a vehicle according to the present invention, in which FIG. 1 is an overall view of the wiper device, and FIG. 2 is a longitudinal sectional view showing the wiper device assembled to a vehicle. , Fig. 3 is an explanatory diagram of the operation, Fig. 4 is an explanatory diagram of the operation showing the case of adjusting the link length, Fig. 5 is an explanatory diagram of the action showing the state of rotation of the spindle, and Fig. 6 is an exploded schematic perspective view of the main part. 7 are schematic cross-sectional views of the locking mechanism. In the figure, 1 is a motor, 3 is a wiper link, 3a is a joint ball, 3b is a guide, 3c is an internal gear, 5 is a blade, 6 is a wiper arm, 8 is a support shaft, and 8a is an external gear.

Claims (1)

[Claims] 1 The proximal end of the wiper link, which is interlockingly connected to the spindle of the wiper arm to which the blade is attached, is pivotally connected to the body frame, and the tip end is pivotally connected to the drive side link, which is interlockingly connected to the wiper motor side, to drive the wiper motor. In the wiper device, the wiper arm is configured to swing back and forth between up and down inverted positions based on forward and backward movement of the drive side link by a predetermined width based on the wiper link. Based on the fact that the wiper arm passes through the long hole-shaped guide so as to be movable in the long hole direction, the link length from the wiper arm support side pivot position to the drive side link pivot position is changed to the lower inverted position. link length adjustment means that can be switched to the snowfall specification side, where the wiper arm swing angle is reduced in both the up and down and reversed positions compared to the normal specification, and the link arm side and wiper arm support shaft. a wiper arm spindle rotating means for forcibly rotating the wiper arm spindle toward the upper reverse position in conjunction with the adjustment switching to the snowfall specification side based on the meshing of the gear portions formed on the side; Furthermore, the wiper arm support shaft rotation means includes:
The forced rotation angle of the wiper arm support shaft is adjusted to the above-mentioned snowfall specifications, and the reduction in the swing angle of the wiper arm at the top inversion position side is offset, so that the wiper arm top inversion position is adjusted to the snowfall specification state. A wiper device for a vehicle, characterized in that the wiper arm is set to substantially match the inverted position on the wiper arm in a normal specification state.