JPS62131819A - Fuel tank made of synthetic resin - Google Patents

Abstract

PURPOSE:To prevent a tube pipe from being clogged by holding a breather tube higher than a supply pipe and a main body communicating section in a holding section provided between the supply pipe and a main body in a fuel tank integratively formed with the fuel supply pipe and the tank main body. CONSTITUTION:An expansion space 2 bulged higher than the protruded base 5 of a supply pipe 4 is formed in a fuel tank main body 1, and a horizontal holding section 6 partially protruded upward is provided between the step 3 of the tank main body 1 thus formed and the supply pipe 4. The straight section 9 of a breather tube 7 is internally chilled and fixed in the holding section 6, the tip is bent downward as an intake port 8, and the other end is bent 10 upward and opened along the inside of the supply pipe 4. According to this constitution, the breather tube at the base of the fuel supply pipe is not required to be bent downward, thus the breather tube pipe can be prevented from being clogged.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fuel tank which is made of synthetic resin and is integrally formed with a fuel tank body and a fuel supply pipe protruding from the body by blow molding or the like. An expansion cavity is formed in the fuel tank body so as to be higher than the protrusion of the fuel supply pipe, and a breather tube with an inlet at one end opened in the cavity is bent lower than the inlet to prevent backflow of fuel. This invention relates to a synthetic resin fuel tank which is fixed so that the discharge port at the other end can be passed through a fuel supply pipe without clogging the pipe.

(Prior art) Even when the fuel tank and fuel supply pipe are made of synthetic resin (k), as shown in FIG. Forming the expansion cavity into an upwardly bulging shape, and opening the suction port CL at one end of the breather tube d, which roughly determines the amount of refueling, into the expansion cavity; The discharge port (12) at the other end is installed to open into the refueling WC at a higher position than the suction port cl.

(Problems to be Solved by the Invention) In the conventional fuel tank illustrated in FIG. must be bent downward (1) at the base C-, of the refueling pipe C. However, when refueling, the fuel flows into the suction port cl.
, fuel flows in from the suction port (1) and accumulates at the bend d-, blocking W2, and the function of the breather tube d is lost when re-injecting. This is not fatal, and due to the compressive force of the air generated in the expansion cavity during refueling, the fuel accumulated in the bend Cl returns from the outlet d-2 into the refueling pipe C and is filled with refueling fuel. However, bending d
, it is ideal to exclude the part . The present invention provides such bending d
The problem is to solve the problem in such a way that it is not necessary to form -3 in the breather tube d.

(Means for Solving the Problems) As described in the previous section, the present invention stores the fuel in the tank body a between the suction port CL of the breather tube d and the discharge port d-2, and thereby The purpose is to eliminate the downward bend d, which would cause the breather tube to lose its function.The suction port at -i is opened into the expansion space, and the discharge port at the other end is set higher than the suction port at +'+7f. The breather tube that opens into the fuel supply pipe at the position is higher than the communication part of the fuel supply pipe with the fuel tank body, and is fixed by passing it through the holding part that is integrally connected and molded between the fuel tank body and the fuel supply pipe. According to this configuration, the breather tube can be fixed at a higher position than the base of the fuel supply pipe, so that it passes straight through the interior of the fuel supply pipe through the expansion space. This reduces the number of man-hours required to create bends in the breather tube, and also solves the problem of fuel retention.

(Example) 1 to 5 show an embodiment of the present invention.

The fuel tank body (1) and the fuel supply pipe (4) are integrally molded by blow molding using synthetic resin.

An expansion cavity (2) is formed inside the fuel tank body (1) to be higher than the protruding base (5) of the fuel supply pipe (4). A step (3) in the direction is formed, and a substantially horizontal holding part (6) with a part projecting upward is provided between the step (3) and the refueling pipe (4).

As shown in the PtfJ5 diagram, the breather tube (7) has a suction port (8) whose tip is bent slightly downward, a straight part (9) that passes through the inside of the holding part (6), and a straight part (9) that passes through the holding part (6). It has an upwardly inclined part (10) formed along the slope of the internal upper surface of the fuel supply pipe (4), and a discharge port (11) that opens at a higher position than the suction port (8). and the straight line part (
9) is fixed by casting around the holding part.

This fixation includes the fuel tank body (1) and the fuel supply pipe (4).
) At the same time as the integral molding of the holding part (6), the molding of the straight part (9) is carried out in parallel.

Specifically, since the retaining tube (6) is crimped to its outer shape by the clamping force of a blow mold, the breather tube (7)
is releasably gripped and supplied to a fixed position by an air blowing pipe (not shown) for blow molding that inflates the inner space.

Since the blow molding mold uses several split molds, the holding part (6) is molded with legs (ELF) and a circular part (6-2) with a slightly larger diameter as shown in Fig. 4. It is possible to do so.

(Operations and Effects of the Present Invention) As clarified from the above explanation, the present invention has the suction port (8) at one end opened into the expansion space (2), and the discharge port (11) at the other end opened into the expansion space (2). A preserver chave (
7) is made higher than the connection 1ff1 part of the fuel supply pipe (4) with the fuel tank body (1), and is integrally connected and molded between the fuel tank body (1) and the fuel supply pipe (4). (6)
The structure is such that the breather tube (7) is fixed by passing it inside, without having to bend it downward like in the past.
Since the straight #1 section between the suction port (8) and the discharge port (11) can be fixed by passing it through the holding portion (6), there is no need to block the tube cavity with fuel as in the conventional case. This has the effect of easily resolving one interstitial point in the tank.

[Brief explanation of drawings]

Figure 11 is a perspective view of the external appearance of the fuel tank of the present invention, Figure 2 is a longitudinal cross-sectional side view of a portion taken along line A-All in Figure 1, and Figure 3 is a partial view taken along line B-B in Figure 1. FIG. 4 is a cross-sectional view of the holding part (6), and FIG. 5 is a perspective view of the breather tube (7). Figures # & 6 are cross-sectional views of conventional fuel tanks. (1) → Fuel tank body (2) → Expansion space

Claims (1)

[Claims] A fuel replenishment pipe is formed to protrude from the fuel tank body, and an expansion cavity is formed in the fuel tank so that the inner space bulges upward from the protruding base end of the replenishment pipe from the fuel tank, and the suction port at one end is expanded. A breather tube that opens into the empty space and opens into the refueling pipe with the discharge port at the other end at a position higher than the suction port is placed higher than the communicating part of the refueling pipe with the fuel tank main body, and the breather tube is connected to the fuel tank main body and refueled. A synthetic resin fuel tank, characterized in that it is fixed by passing through a holding part that is integrally connected and molded between pipes.