JPS60191887A - Breezer device of fuel tank for car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a breather device for a fuel tank for a vehicle such as a motorcycle.

(Prior Art) The fuel tank of a motorcycle is generally provided with a breather device δ. This device is configured as follows, for example. That is, a separate lake is provided in the fuel tank to separate fuel and waste. One end of the communication path formed in the separate lake opens into the fuel tank, and the other end is connected to the canister device.

In addition, here, the canister device described in - is a device that uses activated carbon or the like to absorb the A-induced scum generated in the fuel tank, as is well known. 1
This gas is once adsorbed by a means, and when the engine is running, this gas is sucked into the engine sill and combusted. However, if the fuel is adsorbed in liquid form by the adsorption means of this canister device, this device will not be able to perform its original function.

However, in the breather device, since the separator is provided within the fuel tank, when the fuel tank is almost filled with fuel, a sufficient gap cannot be provided between the separator and the liquid level of the fuel. Therefore, the separator is likely to be immersed in the fuel due to fluctuations in the liquid level due to the vehicle p4 running, etc., and there is a risk that this fuel may easily flow into the canister device through the separator while still being a liquid.

(Object of the Invention) The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a breather device that prevents fuel 1 in a fuel tank from flowing into a canister device.

(Structure of the Invention) A feature of the present invention to achieve the above object 1 is that a communication passage is formed in the cap located on the top of the tank body, and this communication passage connects the inside of the tank body and the canister device. That's the point.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

■ is a motorcycle, and its body frame 2 has an engine 3.
At the same time, a fuel tank 4 for supplying fuel to the engine 3 is removed. 6 is a front fork, 7 is a front wheel, and 8 is a seat.

The fuel tank 4 has a tank body 10 having a flat upper surface. A vibrator 11 is welded to the top of the tank body 10, and the inner hole of this pipe 11 serves as a fuel supply port 12. And this fuel “1 supply rt
A cap 13 is provided that allows the cap 12 to be opened and closed.

The cap 13 includes a cap body 15 and this gear.
A pivoting means 16 for pivotally supporting the tank body 15 on the upper surface of the tank body 10, and a cap body 15 for the fuel supply LJ 12.
It has a locking means 17 for maintaining the closed position.

The cap body 15 is a flat bowl-shaped cover plate 1 made of sheet metal.
8 and a circular base 19 fitted into this cover plate 18.
It has On the other hand, the two-part pivot means 16 has a support base 22 screwed onto the upper surface of the tank body 10 with pins 21 and 21, and the cap body 15 is pivotally supported on this support base 22 by a pivot shaft 23. Ru.

The locking means 17 is attached to the circular base 19 with a port 1-25.
．． 25, and this lock and an inner flange 27 formed on the fuel supply II 12 are removably engaged, so that the gear pump body 15 is connected to the fuel supply IJ l 2.
(solid line in the figure). -1. To release the engagement between the retaining projection 26 and the inner flange 27, see Figure/K l
This is accomplished by inserting a key with no lock into the key hole 28 provided in the locking means 17 and rotating it (as shown by the two-dot chain line in FIG. 4). By this release, the cap body 15 is rotated in three directions. fuel supply 1: I' l 2
is opened (flange shown in dotted chain line in Figure 2). 29 is Patsukin.

(The front part of the breather device is submerged in the fuel tank 4 having the above structure.Hereinafter, this device will be explained.

1- A communication passage 31 is formed in the cap 13, one end side of this communication passage 31 is opened into the tank body lo, and the other end side is connected to the canister device (1) through a communication pipe 32 and a control valve 33. communicated. Although the two-part control I/roll/help 33 is not shown, it is configured to automatically prevent fuel from flowing to the canister device when the heavy vehicle is in a sideways position.The two-part communication passage 31 will be explained in more detail.

1-Force distribution/A passage 35 is formed between the plate 18 and the circular base 19 in an arcuate shape in plan view, and one end of this main passage 35 opens into the tank body 10 via the first communication passage 36. do.

A sponge 37 is fitted into the first communication path 36.

Further, a midway portion of the main passage 35 opens into the tank body IO via a second communication passage 38. This second communication path 38 is provided with a check valve 39, and this check valve 39 has a pole 40 which is a valve body. , main passage 35
Only flow from the tank body 10 into the tank body 10 is allowed.

Further, -1, the other end of the article passage 35 opens on three sides of the support base 22 via a third communication passage 42. This support stand 2
A fourth connecting path 43 is formed in the second connecting path 43, and a compasskin 44 is formed between the opposing opening edges of the third connecting path 42 and the fourth connecting path 43.
is intervened. This rubber gasket 44 is attached to the support base 22 side, and when the cap body 15 is rotated upward, communication between the third communication path 42 and the fourth communication path 43 is released.

The fourth communication path 43 is connected to one end of the communication pipe 32 screwed to the tank body IO.

Next, the action of the breather device using -1- structural acid will be explained.

When the internal pressure of the fuel tank 4 becomes lower, outside air is sucked into the fuel tank 4 through the communication pipe 32 and the communication path 31 (indicated by an arrow 1Δ).

On the other hand, when the internal pressure of the fuel tank 4 increases, the fuel tank 4
The fuel gas inside flows in the opposite direction to the above and is led to the canister device. Further, when the fuel tank 4 is filled with fuel, if the fuel tries to flow into the communication passage 31 in a liquid state, the flow of this fuel into the communication passage 31 is regulated by the check button t39 (the fourth (as shown by the dashed line in the figure), this restricts the flow to the canister assembly 7i.

(Effects of the Invention) According to the present invention, since the inside of the tank body and the canister device are connected by the communication passage formed in the cap located at the top of the tank body, when fuel is about to flow to the canister device side, this The fuel will pass through almost the top of the fuel tank. Therefore, the flow of fuel into the canister device is effectively suppressed.

[Brief explanation of drawings]

The figures show an embodiment of the present invention. Figure 7tS1 is a side partial cross-sectional view of the rm section of a motorcycle, Figure 2 is a partially enlarged cross-section 1Δ of Figure 1, and Figure 3 is a view taken along the ■-m line in Figure 2. 4 is a sectional view taken along the line IV-IV in FIG. 2, FIG. 5 is a sectional view taken along the line v-V in FIG. 4, and FIG. 6 is a sectional view taken along the line VI-Vl in FIG. 2. It is an arrow view. l...Motorcycle (vehicle), 4...fuel tank, 10...
- Tank body, 12 - fuel supply port, 13 - cap, 31 - communication passage.

Claims (1)

[Claims] ■In a vehicle fuel tank that has a fuel supply port formed at the top of the tank body and a cap that can be opened and closed, one end side opens into the tank body and the other end opens into the tank body. A breather device for a fuel tank for a vehicle, characterized in that a communication path connected to a side canister device is formed in a two-part cap.