JPH0348055B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a washer fluid supply device that supplies washer fluid for cleaning automobile windows and the like.

"Prior Art" An example of a conventional washer fluid supply device is shown in FIG. This washer fluid supply device 50 injects washer fluid onto the front window glass F or rear window glass R of the automobile A, and includes a tank 51, a pump 52, a flow path switching valve 53,
It basically consists of a rear pipe 54, a rear nozzle 55, a front pipe 56, and a front nozzle 57.

When the flow path switching valve 53 is energized, the front side is selected and the rear side washer fluid supply path is cut off.
On the other hand, if the power supply is cut off, the rear side is selected and the front side washer fluid supply path is cut off.

Therefore, if either the front or rear window is selected using the flow path switching valve 53 and the pump 52 is operated, the washer fluid is injected only onto the window glass on the selected side.

"Problems with the Prior Art" In the washer fluid supply device 50 shown in FIG. 3, when the washer fluid supply device 50 is stopped, the flow path switching valve 53 is de-energized. is in a state where it is cut off, and the washer fluid is held in the front pipe 56.

The reason why the washer fluid is kept in the front pipe 56 in this way is to eliminate the delay time from when the pump 52 is activated until the washer fluid is injected from the front nozzle 57. That is, if the front pipe 56 is emptied, the washer fluid will not be ejected from the front nozzle 57 until the front pipe 56 is filled with washer fluid after the pump 52 is activated, resulting in the aforementioned delay time, but the front pipe 5
Since 6 is long, this delay time also becomes long.
Therefore, by holding washer fluid in the front pipe 56 in advance, this delay time is eliminated.

Further, the reason why the valve is provided in this way is to prevent the washer fluid from being forced out from the front nozzle 57 when sudden acceleration is applied or the vehicle body is tilted. That is, this is because one side of the flow path switching valve 53 is completely blocked.

By the way, if the front pipe 56 contracts due to a change in temperature, or if air is mixed in the front pipe 56 and it thermally expands due to a rise in temperature, the washer liquid held in the front pipe 56 will leak into the front nozzle. 57 may be pushed out.

However, when the washer liquid is forced out from the front nozzle 57 in this way, there is a problem in that unsightly flow marks are left on the front window glass F and the body.

``Object of the Invention'' An object of the present invention is to provide a washer liquid supply device that can hold the washer liquid in a pipe connecting a pump and a nozzle and prevent the washer liquid from being forced out from the nozzle when not intended. With the goal.

``Structure of the Invention'' The washer fluid supply device of the present invention maintains the washer fluid in the washer fluid supply pipe by blocking communication between the washer tank and the washer nozzle with a normally closed valve disposed near the washer tank except when the washer fluid is being supplied. In the type of washer fluid supply device, when the washer fluid is being supplied, it is closed and the washer fluid does not leak from the washer fluid supply pipe, but when the washer fluid is not being supplied, it is at least temporarily open and communicated with the outside of the vehicle, and the washer nozzle is closed. A structural feature is that a washer liquid leaking means for leaking the washer liquid in the nearby washer pipe to the outside of the vehicle is provided in the part of the washer liquid supply pipe near the washer nozzle and below it.

"Example" The present invention will be further explained in detail below based on the example shown in the drawings. Here, FIG. 1 is an explanatory diagram of the structure of a washer fluid supply device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a leakage valve in the embodiment shown in FIG. Note that this invention is not limited to this.

In the washer liquid supply device 10 shown in FIG. 1, a tank 11, a pump 12, a flow path switching valve 13,
The rear pipe 14, rear nozzle 15, front pipe 16, and front nozzle 17 are the same components as conventionally known components.

The difference from the conventional configuration is that the front pipe 16
A washer liquid leaking means 30 consisting of a three-way joint 18, a drain pipe 19 and a leak valve 20 is provided in a part of the front nozzle 17 near and below it.

Leak valve 20 is of similar construction to a ball check valve, as shown in FIG. That is, a ball 22 is placed on a seat 23, and a spring 21 is attached to the ball 22. Spring 21 moves ball 22 to seat 2
The ball 22 is not pressed against the ball 22, but rather works to prevent the ball 22 from jumping unnecessarily due to vibrations of the automobile A or the like. Therefore, ball 22
may be slightly separated from the seat 23 due to vibrations of the automobile A, and at this time the leakage valve 20
The inside of the vehicle is communicated with the outside of the vehicle. On the other hand, when a pressure greater than a certain level is exerted to press the ball 22 downward in FIG. 2, the ball 22 comes into close contact with the seat 23.

Next, the operation will be explained.

First, regarding the rear side, the pump 12
When activated, the washer fluid is injected from the rear nozzle 15 toward the rear window glass R.
When the pump 12 is stopped, the injection is also stopped, and the washer fluid in the rear pipe 14 flows back into the tank 11. As a result, the inside of the rear pipe 14 becomes empty,
Next, when the washer fluid is supplied, there is a delay time that is sufficient for the washer fluid to fill the inside of the rear pipe 14. However, since the length of the rear pipe 14 is short, this waiting time hardly poses a problem. Furthermore, since the rear pipe 14 is empty, the washer liquid is not naturally pushed out from the rear nozzle 15, and problems such as flow marks on the rear body do not occur.

Next, regarding the front side, the flow path switching valve 13
energizes the pump 12 to operate the pump 12. Thereby, the washer liquid is supplied to the front nozzle 17 via the front pipe 16, and is sprayed from the front nozzle 17 toward the front windshield F. At this time, the washer liquid should be added to the three-way joint 1.
8. The washer fluid flows into the leak valve 20 via the drain pipe 19, but since the washer fluid is under pressure due to the operation of the pump 12, the ball 22 is pressed against the seat 23 by that pressure, blocking the flow. Therefore, the washer liquid will not leak through the washer liquid leaking means 30.

When stopping the injection, the pump 12 is stopped, and then the flow path switching valve 13 is de-energized. As a result, the end of the front pipe 16 on the flow path switching valve 13 side is closed, so that the washer fluid is retained within the front pipe 16.

By the way, at this time, no pressure is applied to the washer fluid in the front pipe 16, so
In the leak valve 20, the ball 22 is connected to the seat 23.
It is lifted up by the vibrations of automobile A, etc., and allows the washer fluid to flow. Therefore, the washer fluid in the front pipe 16 can flow out to the outside through the washer fluid leaking means 30.

However, from the flow path switching valve 13 to the three-way joint 1
The washer liquid in the pipe portions up to 8 cannot flow out because the end on the flow path switching valve 13 side is sealed and remains retained. On the other hand, from the front nozzle 17 to the three-way joint 18
Since air enters the washer fluid from the front nozzle 17, the washer fluid in the area up to this point flows out of the vehicle through the washer fluid leaking means 30.

As a result, the pipe portion between the front nozzle 17 and the three-way joint 18 becomes empty, and the washer fluid is no longer forced out from the front nozzle 17 due to temperature changes or the like. In other words, traces of the washer liquid are prevented from forming on the front window glass F or the body.

On the other hand, since the washer fluid is held in the pipe section from the flow path switching valve 13 to the three-way joint 18, which occupies most of the front pipe 16, there may be a long delay time when the next time the washer fluid is supplied. There isn't.

"Effects of the Invention" According to the present invention, a normally closed valve disposed near the washer tank shuts off communication between the washer tank and the washer nozzle except when the washer fluid is being supplied, thereby retaining the washer fluid in the washer fluid supply pipe. In the washer fluid supply device, when the washer fluid is being supplied, the washer fluid is in a closed state so that the washer fluid does not leak from the washer fluid supply pipe, but when the washer fluid is not being supplied, it is at least temporarily in an open state and communicated with the outside of the vehicle, and the inside of the washer pipe near the washer nozzle is kept open. A washer fluid supply device is provided, characterized in that a washer fluid leaking means for leaking the washer fluid out of the vehicle is provided in a portion of the washer fluid supply pipe near the washer nozzle and below the washer fluid nozzle. It is possible to eliminate the delay time until the washer liquid is spouted from the nozzle, and to prevent the washer liquid from naturally flowing out from the nozzle and leaving unsightly traces.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the configuration of a washer fluid supply device according to an embodiment of the present invention, FIG. 2 is a sectional view of a leak valve in the embodiment shown in FIG. 1, and FIG. 3 is an example of a conventional washer fluid supply device. FIG. (Explanation of symbols) 10... Washer liquid supply device, 11... Tank, 12... Pump, 13... Channel switching valve, 14... Rear pipe, 15... Rear nozzle, 1
6...Front pipe, 17...Front nozzle, 1
8...Three-way joint, 19...Drain pipe, 20
...Leak valve, 21...Spring, 22...Ball, 23...Seat, 30...Water fluid leakage means.

Claims (1)

[Scope of Claims] 1. A washer fluid supply device of a type in which the washer fluid is retained in the washer fluid supply pipe by blocking communication between the washer tank and the washer nozzle with a normally closed valve disposed near the washer tank except when the washer fluid is being supplied. When the washer fluid is being supplied, the pipe is closed and the washer fluid does not leak from the washer fluid supply pipe, but when the washer fluid is not being supplied, it is at least temporarily open and communicated with the outside of the vehicle to drain the washer fluid in the washer pipe near the washer nozzle. A washer fluid supply device characterized in that a washer fluid leaking means for leaking out of the vehicle is provided in a portion of the washer fluid supply pipe near and below the washer nozzle.