JPH038518Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiper device for a vehicle, and particularly to a wiper device for a vehicle in which the blade rubber contacts the windshield surface with uniform pressure during driving.

A typical wiper device has a holder pivotally attached to an arm that swings back and forth by a drive device, and is configured to hold a backing to which a blade rubber that contacts the surface of the window glass is attached to the holder. The blade rubber of such a conventional device is set so that the contact pressure against the window glass surface in a stationary state is evenly distributed over the length of the blade rubber.

However, when the wiper device is in operation, the blade rubber rotates back and forth in a fan-shaped trajectory on the windshield surface, so there is a difference in rotational speed between the tip and rear end of the blade rubber. While the vehicle is running, the wind conditions at the tip and rear end of the blade rubber are different. For this reason, when the wiper device is operated while driving at high speed, the contact pressure of the blade rubber in contact with the windshield surface is not uniform, and depending on the shape of the windshield, the contact pressure at the tip of the blade rubber is uneven. The pressure tends to be weaker than that at the rear end. In order to solve this problem, it is possible to move the pivot point between the tip of the arm and the lever closer to the tip of the lever, but this is not effective enough and also forces the arm toward the windshield. It is conceivable to strengthen the elastic force of the spring that generates the lift, or to attach fins to the arm that generate reverse lift, but these disadvantages include larger parts, a more complicated structure, and the need for additional members.

The present invention was developed in view of the above-mentioned problems of conventional wiper devices, and the contact pressure of the blade rubber against the windshield surface is approximately equal across the length of the blade rubber even when driving at high speed. The purpose of the present invention is to provide a wiper device for a vehicle.

In order to achieve this purpose, the wiper device according to the present invention includes a tip-side holder and a rear-end holder, each having a plurality of holding claws for holding the front and rear ends of a backing to which a blade rubber that contacts the windshield surface is attached. At the same time, this holder was supported by a lever, and this lever was pivotally connected to the tip of an arm biased toward the window glass.
This pivot point is located forward of the center of the blade rubber. Then, the sum of the spacing between the holding claws of the tip side holder is made shorter than the sum of the spacing between the holding claws of the rear end side holder, and the contact pressure per unit length of the tip side of the blade rubber acting on the window glass surface is reduced. The gist is that the spacing between the holding claws on the tip side is shorter than on the rear end side in order to make the contact pressure higher than the contact pressure per unit length on the rear end side of the rubber and prevent the tip side from lifting up during high-speed running. .

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of a vehicle wiper device according to the present invention, with the left side in the figure being the front end side and the right side being the rear end side.

In the figure, reference numeral 1 denotes an arm, and the base end of the arm 1 is connected to a drive device such as a motor, and swings back and forth around the base end. The arm 1 is urged toward the window glass by a spring (not shown), and the center of the lever 2 is attached to the tip of the arm 1 by a pin 3.
Pivotally connected via.

Further, a first holding fitting 5 on the tip side forming an arc shape is pivotally attached to the tip end of the lever 2 via a pin 4, and a rear end forming an arc shape is attached to the rear end of the lever 2 via a pin 6. The first holding fitting 7 on the side is pivotally attached. A holding claw 8 is formed at the distal end of the first holding fitting 5 on the distal side, and a second holding fitting 9 on the distal side having an arc shape is pivotally attached to the rear end via a pin 10. Holding claws 11 and 12 are formed at both ends of the second holding fitting 9.
Further, a holding claw 13 is formed at the rear end of the first holding fitting 7 on the rear end side, and a second holding fitting 14 on the rear end side having an arc shape is pivotally connected to the front end via a pin 15. ,
Holding claws 16 and 1 are attached to both ends of this second holding fitting 14.
form 7.

Furthermore, the holding claws 8, 11, 12, 13, 1
6 and 17 hold the backing 19 which holds the blade rubber 18 between them.

Here, the interval between the holding claws 8 and 11 is l ₁ , and the holding claw 1
The distance between 1 and 12 is l ₂ and the distance between retaining claws 16 and 17 is
If l ₃ and the interval between the holding claws 13 and 17 are l ₄ , then l ₁ + l ₂
The relationship <l ₃ +l ₄ holds true.

FIG. 2 is a side view showing the wiper device having the above configuration pressed against the window glass 20;
Figure 3 is a graph showing the contact pressure (pressing force) of the blade rubber 18 against the windshield 20 when the vehicle is stationary and the wiper device is inactive, in correspondence with Figure 2, and Figure 4 is a graph showing the contact pressure (pressing force) of the blade rubber 18 against the windshield 20 when the vehicle is stationary and the wiper device is inactive. This is a graph showing the contact pressure of the blade rubber 18 against the windshield 20 when the wiper device is in operation, in correspondence with FIG. Since the arm is attached to the arm, the pressing force transmitted from the arm is evenly distributed between the leading end and the rear end. A first holding fitting 5 on the tip side is attached to the tip of the lever 2, a first holding fitting 7 on the rear end side is attached to the rear end, and a first holding fitting 7 on the tip side is attached to the rear end of the first holding fitting 5 on the tip side. Since the second holding fitting 9 on the distal side and the second holding fitting 14 on the rear end side are pivotally attached to the distal end of the first holding fitting 7 on the rear end side, respectively,
Even if the window glass 20 is curved as shown in FIG. 2, the blade rubber 18 contacts the surface of the window glass 20 without any gaps. Furthermore, in the stationary and non-operating state, the pressing force evenly distributed on the lever 2 is applied to the holding fittings 5, 9 on the front end side and the holding fittings 7, 1 on the rear end side via the pins 4, 6, respectively.
4, and is transmitted to the blade rubber 18 via the holding claws of these holding fittings. Then, the pressing force distributed to the tip side acts as a force to press the blade rubber 18 by the length of the interval (l ₁ + l ₂ ) between the holding claws 8 and 12 against the surface of the window glass 20, and the pressing force is applied to the rear end side. The dispersed pressing force acts as a force that presses the blade rubber 18 for the length of the interval (l ₃ +l ₄ ) between the holding claws 13 and 16 against the surface of the window glass 20. As mentioned above, since l ₁ +l ₂ <l ₃ +l ₄ , the pressing force acting per unit length of the blade rubber 18 on the tip side is equal to the pressing force on the blade rubber 18 on the rear end side.
The distribution of the pressing force of the blade rubber 18 against the window glass 20, that is, the contact pressure, is as shown in FIG.

On the other hand, in the running state, the blade rubber 18 reciprocates in a fan-shaped trajectory, so the rotation speed on the tip side of the blade rubber 18 is faster than the rotation speed on the rear end side of the blade rubber 18. Therefore, while driving, a large lift force acts on the tip side of the blade rubber 18 due to wind pressure, and the contact pressure of the tip side of the blade rubber 18 against the windshield 20 decreases, resulting in a change in the contact pressure distribution of the entire blade rubber 18. are equalized as shown in FIG.

As explained above, according to the present invention, the holding fitting that holds the blade rubber through buckling is divided into the tip side and the rear end side, and the sum of the spacing of the holding claws of the holding fitting on the tip side is determined by the holding fitting on the rear end side. This is made smaller than the sum of the spacing between the retaining claws of the metal fittings, and when the wiper device is stationary and inactive, the contact pressure on the tip side of the blade rubber is greater than the contact pressure on the rear end side, so it can be used while driving at high speeds. When the wiper is operated and a large lifting force is applied to the tip of the blade rubber, the windshield can be wiped with even contact pressure. According to the present invention, many effects such as the above-mentioned effects can be achieved without adding special members such as fins to the wiper.

[Brief explanation of drawings]

Fig. 1 is a side view of the vehicle wiper device according to the present invention, Fig. 2 is a side view showing the wiper device in contact with the windshield, and Fig. 3 is the blade rubber of the wiper device in a stationary and non-operating state. FIG. 4 is a graph showing the contact pressure distribution of the blade rubber when the wiper device is in running operation. In addition, in the drawing, 1 is an arm, 2 is a lever, 5 and 9 are front end side holders, 7 and 14 are rear end side holders, 8 and 1
1, 12, 13, 16, and 17 are holding claws, 18 is a blade rubber, 19 is a backing, 20 is a window glass, and l ₁ , l ₂ , l ₃ /l ₄ are holding claw intervals.

Claims (1)

[Claims for Utility Model Registration] A lever is pivotally attached to the tip of an arm that is reciprocally swung around the base by a drive device and is biased toward the windshield side, and the tip and rear ends of this lever are In the wiper device, a tip side holder and a rear end side holder are attached to each of the arms, and a backing to which a blade rubber is attached is held by a plurality of holding claws provided on each of these holders, The tip portion and the pivoting portion of the lever are located forward of the center portion of the blade rubber, and the sum of the holding pawl intervals of the tip side holder is shorter than the sum of the holding pawl intervals of the rear end side holder, In addition, the contact pressure per unit length on the tip side of the blade rubber acting on the windshield surface is made larger than the contact pressure per unit length on the rear end side of the blade rubber to prevent the tip side from lifting up during high-speed running. Accordingly, the vehicle wiper device is characterized in that the interval between the holding claws on the leading end side is set shorter than on the rear end side.