JPH08310260A - Connecting structure for fuel tube in fuel tank - Google Patents

Abstract

PURPOSE: To effectively prevent rusting of a connecting tube, and reduce as far as possible a space on a tank for fixedly connecting a connecting member to the connecting tube, and to increase a degree of mounting freedom, in a connecting structure for a fuel tube in a fuel tank wherein the connecting tube made of metal, with the inside communicating with the inside of the tank, is protrusively provided in an upper surface of the fuel tank so as to oil-tightly connect the connecting member, provided in a base end of the fuel tube extended to the engine side, to the connecting tube. CONSTITUTION: Connecting members J1 , J2 are provided with a cylindrical coating part 10 of fitting connecting tubes 11a, 12a coated and a flange part F successively provided in line with the periphery of the coating part 10. A fixed plate Pf, engaged with the flange part F to bring an opening end 10e of the coating p[art 10 into press contact with an upper surface of a fuel tank T, is provided on the fuel tank T.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
A fuel in a fuel tank, in which a metallic connecting tube that communicates with the inside is projectingly provided in the tank, and a connecting member provided at a base end of a fuel tube extending to the engine side is oil-tightly connected to the connecting tube. The present invention relates to a tube connection structure.

[0002]

2. Description of the Related Art Conventionally, as a structure for connecting the above fuel tubes, for example, as shown in FIG. 6, a covering portion 10 'of a synthetic resin connecting member J' provided at the base end of a fuel tube C is used.
Only the tip of the connecting cylinder Jp protruding from the upper surface of the fuel tank T is fitted and covered, and the retainer R attached to the covering 10 ′ is engaged with the annular locking projection a provided on the outer periphery of the front end of the connecting cylinder Jp. The connection member J ′ is connected to the connection tube J by being detachably locked.
It is known to connect and fix to p.

[0003]

However, in such a conventional structure, the retainer R is provided so as to project from the open end e of the connecting member J ', and the retainer R is connected to the connecting cylinder J.
In order to engage and disengage with p, it is necessary to secure a space at least between the open end e of the connecting member J ′ and the upper surface of the fuel tank T, and there is a problem that the degree of freedom in mounting decreases. In addition, a metal connecting tube J protruding from the upper surface of the fuel tank T
Since p is not covered by the connecting member J ′, that is, it is exposed to the outside, there is a problem that rust is likely to occur on the exposed portion X of the connecting cylinder Jp.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a connecting structure for a fuel tube in a fuel tank, which is capable of solving the above-mentioned problems of the conventional structure.

[0005]

In order to achieve the above-mentioned object, the present invention has a metal connecting cylinder projecting on the upper surface of a fuel tank, the inside of which is communicated with the inside of the tank. In a fuel tube connection structure in a fuel tank, wherein a connecting member provided at a base end of an extending fuel tube is oil-tightly connected, the connecting member is a tubular covering portion that fits and covers the connecting tube. A fixing plate is provided on the fuel tank, the fixing plate engaging with the flange portion and press-contacting the open end of the covering portion with the upper surface of the fuel tank. Is characterized by.

In addition to the above features, the invention of claim 2 is characterized in that a plurality of cutouts can be inserted into the fixing plate at the outer periphery of the covering portion of the connecting member and can be engaged with the flange portion of the connecting member. A recess is provided, and the recess is provided.
In addition to the above respective features, the invention of claim 1 is characterized in that a lip portion that can be engaged with the fixing plate so as to sandwich the fixing plate between the flange portion and the outer periphery of the covering portion is provided in a protruding manner. And

[0007]

According to the features of the invention of each of the above claims, the connecting cylinder is fitted and covered by the covering portion of the connecting member provided at the base end of the fuel tube, and the flange portion on the outer periphery of the covering portion is provided on the fuel tank. Since the fixing plate is engaged so that the open end of the covering portion is brought into pressure contact with the upper surface of the fuel tank, the covering portion can completely cover the exposed portion of the metal connecting cylinder. The connecting member can be accurately connected and fixed to the connecting cylinder without providing a retainer on the open end side.

Further, in particular, according to the features of the invention of claim 2,
The base ends of the plurality of fuel tubes can be collectively fixed by a common fixing plate. Further, according to the feature of the invention of claim 3, between the flange portion and the lip portion projecting on the outer periphery of the covering portion. By sandwiching the fixed plate, it is possible to temporarily fix the fixed plate to the connecting member at the base end of the fuel tube before the fixed plate is set on the fuel tank to make it difficult to separate the two.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is an overall perspective view of a fuel tank according to an embodiment of the present invention, FIG. 2 is an enlarged plan view taken along the arrow 2 in FIG. 1, and FIG. 3 is a vertical sectional view taken along line 3-3 of FIG. Figure 4
4 is an enlarged plan sectional view taken along line 4-4 of FIG. 3, and FIG.
5 is a vertical sectional view taken along line 5-5 of FIG.

1 to 3, a metallic fuel tank T disposed and fixed below a vehicle body floor of an automobile has a mounting hole 2 for a fuel pump P formed in an upper wall bulge 1a of the tank body 1. At the opening edge of the mounting hole 2, the hole 2
The pump bracket B, which also serves as a lid (hence a part of the upper wall of the fuel tank T), is detachably attached by a plurality of sets of bolts 3 and nuts 4 and is attached with the annular seal member S ₁ interposed therebetween. On the lower surface of the pump bracket B, the fuel pump P
Also, the upper end of the mounting plate 5 supporting the fuel strainer St is provided obliquely downward, and on the upper surface of the bracket B,
A connector Co to which the power supply cord 6 for the fuel pump P can be connected, the inside of the fuel tank T, and a canister (not shown).
A stay 7 for mounting the valve V that can open and close the space is provided in a protruding manner. In FIG. 1, reference numeral 20 is an oil supply pipe connected to an oil supply port (not shown) and is integrally provided on the tank body 1 so as to project.

On the pump bracket B, intermediate portions of the first and second metal connecting pipes 11 and 12 which vertically penetrate the bracket B are integrally fixed by a fixing means such as welding. The lower end of the first connection pipe 11 is connected to the discharge portion 8 of the fuel pump P, and the lower end of the second connection pipe 12 is directly opened into the fuel tank T. The upwardly extending portion 11a of the first connecting pipe 11 which linearly protrudes from the upper surface of the pump bracket B constitutes the connecting cylinder of the present invention, in which a base end of the supply fuel tube C ₁ is provided. The first connecting tool J ₁ as a connecting member provided is oil-tightly connected, and the upward extending portion 12a of the second connecting pipe 12 that linearly projects from the upper surface of the pump bracket B also has the connecting tube of the present invention. A second connecting tool J ₁ as a connecting member provided at the base end of the recirculation fuel tube C ₂ is oil-tightly connected thereto.

The tip ends of the fuel tubes C ₁ and C ₂ are connected to a fuel injection valve (not shown) as a fuel supply portion of an internal combustion engine, and the fuel discharged from the fuel pump P during engine operation. Is supplied to the fuel injection valve through the first connection pipe 11 and the supply fuel tube C ₁ , and the surplus fuel is returned to the fuel tank T through the recirculation fuel tube C ₂ and the second connection pipe 12.

Next, referring also to FIGS. 4 and 5, the connection between the upwardly extending portions 11a and 12a (that is, the connecting cylinders) of the connecting pipes 11 and 12 and the corresponding fuel tubes C ₁ and C ₂ base ends. A connection structure between the tools J ₁ and J ₂ (connection members) will be specifically described. Each of the connecting tools J ₁ and J ₂ has a small diameter cylindrical connecting portion 9 whose one end is oil-tightly fitted and connected to the inner circumference of the base end of the corresponding fuel tube C ₁ or C ₂ via a seal ring S _2. And the corresponding connection pipe 1 that is continuously provided at the other end of the connection portion 9.
A large diameter cylindrical covering portion 10 that fits and covers the upper extending portions 11a and 12a of the first and the second portions 12 and 12 is integrally formed of a synthetic resin material. On the inner peripheral surface of the covering portion 10, a large diameter hole portion 13 continuing to the open end thereof and a small diameter hole portion 14 adjacent to the large diameter hole portion 13 via a step are formed, and the small diameter hole portion 14 thereof is formed. Directly communicates with the internal space of the connecting portion 9, and the large diameter hole portion 13 is fitted with a seal ring S ₃ , an annular spacer 15, a second seal ring S ₄ and an annular bush 16 in this order from the back. It is equipped.

A pump bracket B is provided on the entire outer circumference of the open end 10e (that is, the lower end) of the covering portion 10.
An annular flange portion F that abuts the upper surface and a fixed space above the flange portion F, that is, a fixed plate Pf described later.
4 and the lip portions L that are lined up at intervals corresponding to the thickness of the projection portion are integrally formed. As shown in FIG.
It is formed only on the outer peripheral surface of 0 corresponding to the connecting portion 9.

On the pump bracket B, one flat plate-shaped fixed plate Pf is detachably attached along the upper surface of the bracket B, and the fixed plate Pf is attached to the left and right edges of the plate Pf, respectively. opening to the connector with the cover portion 10 the outer periphery of the connector J ₁ may clamping input J ₁
First and second notched recesses 2 that can engage with the flange portion F of the
1, 22 and a bolt insertion hole 17 located in the middle of the recesses 21, 22.

The recesses 21 and 22 are connected to the connecting members J ₁ ,
Circular outer diameter d substantially the same inner diameter of the covering portion 10 of the J ₂ holes 2
1c, 22c and an opening width t'which is smaller than the inner diameter of the circular hole portions 21c, 22c and is equal to or larger than the tangential length t of the lip portion L, the circular hole portions 21c, 22c. It is composed of openings 21o and 22o that open 22c to the side edge of the fixed plate Pf. Moreover, the circular hole portion 22 of one concave portion (the second concave portion 22 on the reflux side in the illustrated example)
c is a perfect circle, and the other concave portion (first side on the supply side in the illustrated example)
The circular hole portion 21c of the recess 21) is formed in an oval shape which is slightly longer in the arrangement direction of the recesses 21 and 22 (the up and down direction in FIG. 4), and the upper extending portions 11a of the connecting pipes 11 and 12, 12a (hence the covering 10, which covers them,
10) The error in the mutual axial distance can be absorbed without difficulty.

In the pump bracket B, a fixing bolt 18 projecting on the upper surface of the bracket B corresponding to the bolt insertion hole 17 is integrally planted by a fixing means such as welding. Therefore, the bolt 18 is fixed to the bolt. The fixing plate Pf can be fixed so as to be pressed against the pump bracket B side by screwing and tightening the nut 19 onto the bolt 18 in a state where the fixing plate Pf is inserted into the insertion hole 17.

Next, the operation of the above embodiment will be described.
Each fuel tube C _1, C ₂ of the fuel tank T when is connected to the corresponding connecting pipes 11 and 12, the fuel tube C _1, C ₂ corresponding advance the connection portion 9 of the connector J _1, J ₂ The seal ring S ₃ , the spacer 15, the seal ring S ₄ and the bush 16 are sequentially fitted to the inner periphery of the covering portion 10 of each of the connecting tools J ₁ and J _{2 while} being connected to the base end.

And these connecting tools J₁, J₂Cover part 1
0 is the corresponding recess 21 of the fixed plate Pf in the free state,
It will be attached to each 22.
First, each connection tool J₁, J₂Outer circumference of the coating part 10
The lip portion L is provided with corresponding recesses 21 and 2 of the fixed plate Pf.
While covering the openings 21o and 22o of the second
The portion 10 is directly placed in the recesses 21 and 22 with the fixing plate Pf.
Insert from the intersecting direction (the direction orthogonal to the paper surface in FIG. 4)
As a result, the flange portion F of each covering portion 10 is formed into the concave portion 2
1, 22 abutting on the peripheral edge of the circular holes 21c, 22c.
Then, each covering portion 10 is rotated about its axis by a predetermined angle (Fig.
By rotating the lip portion L by about 90 degrees in the example shown)
The circle of the recesses 21 and 22 between it and the flange portion F.
The peripheral edges of the shaped holes 21c and 22c are sandwiched so as to sandwich the peripheral edges.
Engage the part. As a result, the fixed plate Pf is used as fuel.
Both sides of the plate Pf are contacted with each other before being set on the tank T.
Sequel J ₁, J₂It can be temporarily stopped at
It has excellent workability.

In this way, both connecting members J₁, J₂Temporary stop
Pump plate into the bolt insertion hole 17 of the fixed plate Pf.
While inserting the fixing bolt 18 on the racket B,
Connector J₁, J₂Connection pipe 1 corresponding to the covering portion 10 of
1, 12 are fitted to the upper extending portions 11a and 12a, respectively.
Cover it, and in that state screw the nut 19 onto the bolt 18.
Tighten this by fixing the fixed plate Pf to the pump
It can be fixed so that it is strongly pressed against the Ket B side.
At the same time, the plate Pf is connected to each connecting device J. ₁, J
₂Press the flange portion F of the to the pump bracket B side,
Each connection tool J₁, J ₂The open end 10e of the covering portion 10 of the
Pressing the lower surface of the lunge portion F against the upper surface of the bracket B
And each connection tool J₁, J₂Connect pipe
Connect to the upper extension parts 11a and 12a of 11 and 12 accurately.
Can be set.

In such a connected and fixed state, the metallic connecting pipes 11, 11 are covered by the covering portions 10 of the respective connecting tools J ₁ , J ₂ .
Since the exposed portions of 12 (that is, the upper extending portions 11a and 12a) can be entirely covered, rusting of the exposed portions can be effectively prevented, and moreover, the connectors J ₁ and J _{2 are provided.}
Upper extending portion 11 of without providing a retainer specially at the open end 10e side of each connector J _1, J ₂ connecting pipes 11 and 12 of
Since it can be accurately connected and fixed to a and 12a, the space on the tank for the connection and fixation can be made as small as possible, and the degree of freedom in mounting can be increased. Moreover, since the two connecting tools J ₁ and J ₂ respectively provided at the base ends of the _two fuel tubes C ₁ and C ₂ can be collectively and simultaneously fixed by one common fixing plate Pf, the fixing structure is fixed. The simplification and the installation work efficiency can be improved.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various embodiments are possible within the scope of the present invention. For example, the number of notched recesses to be provided in the fixing plate is not limited to the number shown in the figure, and may be one or three or more. Further, the flange portion does not necessarily have to be provided on the outer circumference of the open end portion of the covering portion as in the illustrated example, and may be provided so as to project on the outer circumferential surface slightly apart from the open end surface of the covering portion.

[0023]

As described above, according to the invention of each claim,
The connecting tube is fitted and covered by the cover portion of the connecting member provided at the base end of the fuel tube, and the fixing plate on the fuel tank is engaged with the flange portion on the outer periphery of the cover portion to open the open end of the cover portion. Since the pressure is applied to the upper surface of the tank, it is possible to completely cover the exposed portion of the metal connecting cylinder with the covering portion, and to effectively prevent rusting of the connecting cylinder. Since the connecting member can be accurately connected and fixed to the connecting cylinder without specially providing a retainer on the open end side of the member, the space on the tank for the connection and fixing can be made as small as possible and the mounting flexibility can be increased. it can.

According to the second aspect of the present invention, the fixing plate is provided with a plurality of notch-shaped recesses capable of sandwiching the outer periphery of the covering portion of the connecting member and engaging with the flange portion of the same member. The base ends of the plurality of fuel tubes can be collectively fixed by a common fixing plate, and the fixing structure can be simplified and the work efficiency can be improved.

Further, according to the invention of claim 3, a lip portion is provided on the outer periphery of the covering portion so as to be engaged with the fixing plate so as to sandwich the fixing plate with the flange portion. Before the fixed plate is set on the fuel tank, the fixed plate can be temporarily fixed to the connecting member at the base end of the fuel tube, which can improve the mounting workability.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a fuel tank according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view taken along the arrow 2 in FIG.

FIG. 3 is a vertical sectional view taken along line 3-3 of FIG.

FIG. 4 is an enlarged plan sectional view taken along line 4-4 of FIG.

5 is a vertical sectional view taken along line 5-5 of FIG.

FIG. 6 is a vertical sectional view similar to FIG. 5, showing a conventional structure.

[Explanation of symbols]

C ₁ , C ₂ Fuel tube F Flange part J ₁ , J ₂ Connection tool as connection member L Lip part T Fuel tank 10 Cover part 10e Open end 11a Upper extension part as connection cylinder 12a Upper extension as connection cylinder Part 21, 22 Notched recess

Claims (3)

[Claims] 1. A metal connecting cylinder (11a, 1a) which communicates with the upper surface of a fuel tank (T) inside the tank (T).
2a) is projected, and the connecting members (J ₁ , J ₂ ) provided at the base ends of the fuel tubes (C ₁ , C ₂ ) extending to the engine side are oil-tightly connected to the connecting cylinders (11a, 12a). In the structure for connecting the fuel tubes in the fuel tank, the connection members (J ₁ , J ₂ ) are the connection tubes (11a,
12a) is provided with a tubular covering portion (10) for fitting and covering, and a flange portion (F) connected to the outer periphery of the covering portion (10), and the flange is provided on the fuel tank (T). The open end (10) of the covering part (10) by engaging the part (F).
A connecting structure of a fuel tube in a fuel tank, characterized in that a fixing plate (Pf) for pressing e) onto the upper surface of the fuel tank (T) is provided. The method according to claim 2, wherein the fixing plate (Pf), said connecting member (J _1, J ₂₎ covering part (10) the flange portion of the member with the outer periphery may be interposed input (J _1, J ₂₎ ( The connection structure for a fuel tube in a fuel tank according to claim 1, wherein a plurality of notched recesses (21, 22) that can be engaged with F) are provided. 3. A lip part (around the outer periphery of the covering part (10)) which can engage with the plate (Pf) so as to sandwich the fixed plate (Pf) between the flange part (F) and the plate (Pf). The fuel tube connection structure for a fuel tank according to claim 1 or 2, wherein L) is provided in a protruding manner.