JPS6116187Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is applied to windows of vehicles, aircraft, ships, buildings, etc., and is a single wiper in which the wiper blade is supported by a wiper arm that rotates around a wiper pivot. This invention relates to improvements to arm-type wiper devices.

In the following description, an automobile will be used as an example of a vehicle.

A wiper device used in an automobile is installed on a front window or the like to ensure visibility when driving in the rain. Such a wiper device has a configuration in which a wiper blade is supported by a wiper arm that rotates around a wiper pivot.
This conventional wiper device has a two-wiper arm type that allows for a large wiping area.
A single wiper arm type is known that allows good wiping with less floating of the wiper arm by the wind flowing through the front window even when driving at high speeds or in strong winds.

In other words, when it comes to automobiles, especially passenger cars,
Generally, for the vertical dimension (vehicle height) of the window,
The dimensions in the left-right (vehicle width) direction are large, so a two-wiper arm type is used, but this two-wiper arm type has high air resistance. For this reason, a single wiper arm type wiper device is suitable for the front window of an automobile traveling at high speed. However, in the case of a single wiper arm type wiper device, the length of the wiper blade is limited by the vertical dimension of the window, so the unwiped area on the left and right sides of the window is larger than that of a two wiper arm type. It was a lot.
As a result, the driver's forward visibility was sometimes impaired. In addition, in a parallel link type wiper device with an auxiliary arm, the auxiliary arm obstructs visibility.
Also, air resistance is large.

This idea was created by focusing on the above-mentioned conventional problems, and by configuring the wiper pivot to draw a reciprocating trajectory in the wiping direction as the wiper arm rotates, it is possible to eliminate the need for a single wiper arm type. To provide a wiper device which can secure a wide field of view by enlarging the wiping area to both left and right sides.

Hereinafter, embodiments of this invention will be described based on the drawings.

In FIG. 1 and FIG. 2, to explain the configuration,
1 is a base body, and the base body 1 is regarded as a fixed link L ₄ , and one end of two links L ₁ and L ₂ among the three links L ₁ , L ₂ , and L ₃ is the connection point of the fixed link L ₄ D.
At G, they rotate freely around each other and are connected in opposite directions.
The other ends of these two links L ₁ and L ₂ are connected to the remaining link L ₃ at connection points E and F.
4. Rotatably rotate around each other and connect in pairs
Configure the node rotation mechanism. In this four-section rotation mechanism, links L ₁ and L ₂ function as levers, and the links
L ₁ and L ₂ extend in directions that intersect with each other in the mechanical diagram, and this four-bar rotation mechanism constitutes both lever mechanisms that use the links L ₁ and L ₂ as levers.

A wiper pivot P is fixed to the intermediate position of the articulating link _L3 , and the wiper arm 2 and the wiper blade 3 are attached to the wiper pivot P at a constant angle with the link _L3 . Both lever mechanisms consisting of this four-section rotation mechanism are provided on the lower side of the wiper pivot P on the opposite side from the wiper blade 3 so as not to obstruct visibility, and the wiper blade 3 is attached to the wiper arm 2. so that it extends along the direction in which it extends,
It is supported by the wiper arm 2. In this embodiment, the front part of the wiper arm 2 which is further forward than the base supported by the wiper pivot P and which supports the wiper blade 3 is arranged in a straight line with the wiper blade 3, so that the front part of the wiper arm 2 is arranged in a straight line with the wiper blade 3. It is designed so that it does not obstruct the view when wiping. A reaction force receiving device is provided at the position of this wiper pivot P. In this reaction force receiving device, a slider 5 and a guide roller 6 are slidably mounted within a guide rail attached to a base 1.

This reaction force receiving device has a function of preventing the wiper blade 3 from separating from the wiping surface due to the lifting of the wiper arm 2. Note that this reaction force receiving device is not necessarily an essential component, but is used to improve the bending rigidity of each link L ₁ , L ₂ , L ₃ and to connect each link at each connection point D, E, F, G. The wiper blade 3 based on the lifting of the wiper arm 2 can be
It is also possible to prevent it from separating from the wiping surface.

On the other hand, a motor arm 8 is rotatably attached to a wiper motor 7 fixed to the base 1, and is connected to the motor arm 8 by a link _L2 through an intermediate link 9. The base body 1, the motor arm 8, the intermediate link 9, and the link _L2 constitute a four-section rotation mechanism like the links _L1 , _L2 , _L3 , and _L4 , and the motor arm 8 serves as a crank, and the link L2 constitutes a four-section rotation mechanism. It has a lever crank mechanism with ₂ as a lever. In this example,
Motor arm 8 is connected to link L ₂ ,
It can be connected to any appropriate position of links L ₁ and L ₃ (including connection points E, F, and extensions).
In addition, when the motor arm 8 rotates, the length and arrangement of each link must be adjusted to prevent these four-section rotation mechanisms from becoming deadlocked, and because there is a range that the wiper blade 3 must wipe. It's decided.

Here, in order to make the wiping speed of the wiper arm 2 the same in both directions, the consideration points B ₁ and B ₂ are placed on the same diameter, but each B ₁ AB ₂ is
Can be set to angles other than 180 degrees. Note that by using a plurality of such wiper devices, the wiping range can be further expanded.

Next, the operation of the wiper device having this configuration will be explained.

When the wiper motor 7 is rotated, the motor arm 8 rotates, and the links L ₁ and L ₂ swing. When the motor arm 8 rotates from consideration point B ₁ to consideration point B ₂ via B, link L ₃ changes its angle as _{1 1} , _{2 2} , therefore, the wiper fixed to this link LC Blade 3 is _{1 1} ,,
_{2 2} Change the angle and wipe it away. On the other hand, when looking at the wiper pivot P, from P ₁ to P
It exhibits a nearly straight trajectory toward P ₂ . In this way, the wiper pivot P draws a reciprocating locus in the wiping direction as the wiper arm 2 rotates. An example of the ratio of the lengths of each link that makes the trajectory of the wiper pivot P substantially straight is L ₁ :
L ₂ :L ₃ :L ₄ =2.5:2.5:1:2.

If the rotation angle of the motor arm 8 is φ to rotate clockwise from the position of B ₁ , and the rotation angle of the wiper blade 3 is θ to rotate clockwise from the horizontal reference, then the motor arm 8 will rotate from B ₁ to B as shown in FIG. ₂ position i.e. φ ₁ =
When rotating from 0 to φ ₂ =180 degrees, the wiper blade 3 rotates relatively linearly up to θ ₂ of _{1 1} θ _{1 2 2} . Therefore, when the motor arm 8 is rotated at a constant angular velocity, the wiper blade 3 and the wiper arm 2 are also rotated at a substantially constant velocity.

The wiping angle of this wiper device is expressed as θ ₂ -θ ₁ , but since the wiper pivot P moves, the wiping area cannot be determined by the wiping angle.
That is, the wiping area of this wiper device is approximately sector-shaped.
MM ₁ N ₁ NN ₂ M _2. In contrast, in a conventional wiper device, when wiping with a wiper blade of the same length, the wiper blade moves in a fan shape.
The wiping area is expressed as Mm ₁ n ₁ Nn ₂ m _2. Therefore, in the wiper device of the present invention, the wiping area is expanded by only the portion shown by the diagonal lines in FIG.

Note that in this example, the wiping angle was still large and M ₁ and M ₂ were separated far apart.
Depending on the shape of the area that requires wiping, the wiping angle may be further reduced, that is, the wiper blade 3
You can change the link length, arrangement, etc. so that it stands up and wipes away. It is also possible to configure a double lever mechanism in which the links L ₁ and L ₂ do not intersect. In this case, the locus of the wiper pivot P will not be on a straight line, but the wiper blade 3 will rotate while the wiper pivot P moves. This is optimal depending on the shape of the wiping range.

As explained above, according to this invention, by configuring the wiper pivot to draw a reciprocating trajectory in the wiping direction as the wiper arm rotates, the wiping area can be reduced even with a single wiper arm type. can be made larger. Therefore, when this wiper device is applied to a vehicle, it is possible to wipe both the left and right sides of the window, ensuring a wide field of view, which is preferable for safe driving. Even with a single wiper arm type wiper device suitable for high-speed driving, the wiper arm, that is, the wiper blade, does not float much, so it is possible to wipe more completely and ensure a sufficient wiping area. Further, by appropriately selecting the length of each link, a preferable wiping range can be selected. Furthermore, since both lever mechanisms consisting of the four-bar rotation mechanism can be provided in areas that do not obstruct the forward view, it is possible to obtain a large wiping area without impairing the forward view.

[Brief explanation of the drawing]

Fig. 1 is a mechanical diagram of the wiper device according to the present invention, Fig. 2 is a specific structural diagram of the wiper device shown in Fig. 1 near the wiper pivot, and Fig. 3 is a diagram of the relationship between the rotation angle of the motor arm and the wiper blade. It is. L ₁ to _{L 4} ... link, 1 ... base body, 2 ... wiper arm, 3 ... wiper blade, 7 ... wiper motor, 8 ... motor arm, 9 ... intermediate link, P ... wiper pivot.

Claims (1)

[Scope of Utility Model Registration Claim] In a single wiper arm type wiper device in which a wiper blade is supported by a wiper arm that rotates around a wiper pivot, three links are provided, assuming that the base is a fixed link. One end portions of two of the links are connected to the base body in a circular pattern around each other, and the other ends of the two links are connected to both ends of the remaining one link in a circular pattern. The wiper pivot is fixed to the connection link so that the wiper pivot draws a reciprocating locus in the wiping direction as the wiper arm rotates, and The wiper arm is fixed to the wiper pivot, and the wiper arm is fixed to the wiper pivot.
One end of the intermediary link is connected to any one of the links of the book at opposite corners around each other, one end of the intermediary link is connected at opposite corners around each other, and a motor arm is connected to the other end of the intermediary link. What is claimed is: 1. A wiper device having a movable pivot, wherein one end of the motor arm is connected diagonally around each other, and the other end of the motor arm is connected to a rotating shaft of a wiper motor to rotate the wiper motor.