JPH10266925A - Fuel piping structure of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong the service life of an elastic ring by fixing respective fuel pipes in a limited space to an engine side between the fixing part to a vehicle and the end part of fuel distribution pipe side, and restricting vibratory input to a connection part due to variation in the relative position of the engine side to the body side. SOLUTION: A fuel supplying tube 11b and a fuel refluent tube 12 are both circulated from one end side of a fuel distribution pipe 3 and the fuel refluent tube 12 is fixed to the fuel distribution pipe 3 just on this side of connection part to the other end side of the fuel distribution 3. In addition to it, both tubes are connected to each other just on this side of the connection part to one end side of the fuel distribution pipe 3 of the fuel supplying tube 11b. In this way, a fixing means on this side of an introduction connector 14 can be installed in a limited space so that the service life of an elastic ring 20 of the introduction connector 14 can be lengthened effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply pipe for supplying and recirculating fuel between a fuel tank and a fuel distribution pipe of an engine, and a fuel pipe structure of a fuel recirculation pipe.

[0002]

2. Description of the Related Art In recent years, when connecting a fuel supply pipe and a fuel recirculation pipe for supplying and recirculating fuel between a fuel tank and a fuel distribution pipe of an engine, a connecting end of one fuel pipe is used as connecting means of the fuel pipes. An insertion pipe is provided at the connection portion, and an introduction connector is provided at the coupling end of the other fuel pipe, and coupling means for coupling the fuel pipes by inserting the insertion pipe into the introduction connector is used.

For example, as shown in FIGS. 1 and 2 of JP-A-5-262145, a fuel tube is connected to a distal end of a small diameter portion of a conduit connecting connector, and a distal end of a large diameter portion of the conduit connecting connector. An engagement claw portion is formed on the portion toward the inside of the conduit connection connector. A floor fuel tube is inserted into the conduit connection connector, and a connection end of the floor fuel tube reaches a concave portion of the body assembly. In addition, a ring-shaped first engagement projection is formed near the connection end of the floor fuel tube toward the outside of the floor fuel tube. The connection end side of the first engagement projection is an inclined surface, and the side opposite to the connection end is an engagement surface with an engagement claw of the conduit connection connector. An elastic ring is provided between the floor fuel tube and the middle diameter portion of the conduit connection connector to seal between the floor fuel tube and the middle diameter portion of the conduit connection connector.

In the above prior art, the conduit connecting connector is fixed to the fuel tank by fixing means, and the insertion side conduit is supported by a support member connected to the fixing means. Thus, the relative position between the vicinity of the connection end of the insertion side conduit and the conduit connection connector is determined. Therefore, relative movement in the axial direction between the vicinity of the connection end of the insertion-side conduit and the conduit connection connector due to vibration of the vehicle body, and bending near the insertion-side conduit connection end are suppressed, and the deformation stress acting on the elastic ring is reduced. It is possible to reduce the length and extend the life of the elastic ring.

[0005]

When a fuel pipe is connected to a fuel distribution pipe for distributing fuel to each cylinder of the engine through such an introduction connector, the relative position between the engine side and the vehicle body side is increased. The deformation stress acting on the elastic ring due to the fluctuation of the elastic ring is extremely large, and the life of the elastic ring is shortened.

On the other hand, various accessories and the like are installed around the engine and its surroundings. In order to suppress a change in the relative position between the engine side and the vehicle body side, the fixing of the conduit connecting connector as in the above prior art is performed. It is difficult to secure a space for installation by means and support members. In particular, when a fuel supply pipe for supplying fuel from the fuel tank and a fuel recirculation pipe for recirculating the fuel to the fuel tank are connected to the fuel distribution pipe, it is difficult to secure a further installation space.

[0007] An object of the present invention is to connect a fuel pipe to a fuel distribution pipe via a connector for introduction by using a connector for introduction due to a change in the relative position between the engine side and the vehicle body within a limited space. An object of the present invention is to provide a fuel pipe structure of an engine that can suppress the vibration input of the engine and prolong the life of the elastic ring.

[0008]

According to the first aspect of the present invention, a fuel tank for storing fuel and an independent intake pipe extending in the cylinder arrangement direction for distributing fuel to each cylinder and extending to each cylinder are provided. A fuel supply pipe for supplying fuel from the fuel tank to the fuel distribution pipe, and a fuel supply pipe for supplying fuel from the fuel tank to the fuel distribution pipe. In the fuel pipe structure of the engine constituted by a fuel recirculation pipe for recirculating the fuel, one of the two fuel pipes has one end on the fuel distribution pipe side and one end on the fuel distribution pipe having one end. The one fuel pipe is rotatably connected to the fuel distribution pipe via an elastic ring by inserting the insertion pipe provided at one end into the introduction connector provided at the other end. And the other of the two fuel pipes The fuel pipe extends along the fuel distribution pipe from one end of the fuel distribution pipe to the other end of the fuel distribution pipe, and the fuel distribution pipe has a fuel distribution pipe end and a fuel distribution pipe end. With the other end, by inserting the insertion pipe provided at one end into the introduction connector provided at the other end, the other fuel pipe is connected to the fuel distribution pipe via an elastic ring. While the two fuel pipes are connected in a rotatable state, the two fuel pipes are respectively fixed to the vehicle at an intermediate portion between the fuel tank and the fuel distribution pipe, and the other fuel pipe is arranged along the fuel distribution pipe. Is fixed to an independent intake pipe or a fuel distribution pipe at a fuel distribution pipe side portion extending to the other fuel pipe between the fixed portion to the vehicle and the fuel distribution pipe end. It is characterized by being connected.

According to the present invention, the other fuel pipe can be fixed to the fuel distribution pipe or the independent intake pipe at the fuel distribution pipe side extending along the fuel distribution pipe, and one of the fuel pipes is fixed to the vehicle. The fuel pipe can be connected to the other fuel pipe between the fuel pipe and the fuel pipe side end. This allows each fuel pipe to be fixed to the engine between the fixed part to the vehicle and the end on the fuel distribution pipe side in a limited space, and to the connection part due to a change in the relative position between the engine side and the vehicle body side. And the life of the elastic ring can be prolonged.

[0010] Further, the other relatively long fuel pipe is connected to one of the fuel pipes between the fixed part to the vehicle and the independent intake pipe or the fixed part to the fuel distribution pipe, so that the fuel distribution pipe is provided. Vibration input to the side end can be further suppressed.

According to a second aspect of the present invention, in the first aspect of the present invention, one fuel pipe is fixed to a transmission case or an engine body between a fixed portion to the vehicle and a connection portion to the other fuel pipe. A telescopic part is provided between the connecting part and the fixed part to the transmission case or the engine body.

According to the present invention, one fuel pipe is fixed to the transmission case or the engine body with the expansion and contraction part from the connection part with the other fuel pipe, so that one fuel pipe due to a change in the relative position between the engine side and the vehicle body side. The vibration input to the fuel distribution pipe end of the pipe can be reliably suppressed, and the relative fluctuation between the transmission case or engine body and the independent intake pipe can be absorbed by the expansion and contraction section, and the fuel distribution pipe end of one fuel pipe can be absorbed. Vibration input to the motor can be further suppressed.

According to the third aspect of the present invention, a fuel tank for storing fuel, and a fuel distribution pipe formed to extend in the cylinder arrangement direction to distribute fuel to each cylinder and fixed to an independent intake pipe extending to each cylinder. A fuel supply pipe that supplies fuel from the fuel tank to the fuel distribution pipe, a fuel supply pipe that supplies fuel from the fuel tank to the fuel distribution pipe, and a fuel recirculation pipe that recirculates fuel from the fuel distribution pipe to the fuel tank. In the fuel pipe structure of the engine, the end of the fuel supply pipe on the side of the fuel distribution pipe and the fuel distribution pipe insert the insertion pipe provided on one side into the introduction connector provided on the other side. Thereby, while the fuel supply pipe is rotatably connected to the fuel distribution pipe via the elastic ring, the fuel supply pipe is fixed to the vehicle at a midway between the fuel tank and the fuel distribution pipe. And above Charge supply pipe is characterized in that it is fixed to the transmission case or engine body between the fixed portion and the fuel distribution pipe end into the vehicle.

According to the present invention, the fuel supply pipe, to which the fuel is pressure-fed from the fuel tank to be rigid, is fixed to the transmission case or the engine body between the fixed portion to the vehicle and the end on the side of the fuel distribution pipe. Micro vibration from the side can be reliably suppressed by the rigid transmission case or the engine body, and the life of the elastic ring can be extended.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a fuel pipe structure according to an embodiment of the present invention, FIG. 2 is a side view, and FIG. 3 is a sectional view showing an introduction connector as a fuel tube connecting device. FIG. 4A is a side view of the clip,
(B) is a bottom view of the clip. 5A is a side view of the connecting clip, FIG. 5B is a side view of the first clip body, FIG. 5C is a bottom view of the first clip body, and FIG. 5D is a side view of the second clip body. FIG. 7E is a bottom view of the second clip body. FIG. 6 is a side view of the clip.

As shown in FIG. 1, a horizontally mounted in-line type engine in which an output shaft of an engine 1 is arranged in a vehicle width direction with respect to a vehicle, wherein a cylinder head 1 of the engine 1 is provided.
a, intake manifold 2 as an independent intake pipe
Are fastened and fixed by bolts. A fuel distribution pipe 3 extending along the cylinder arrangement direction is fastened and fixed to the upper part of the intake manifold 2 by bolts, and distributes and supplies fuel pumped from a fuel tank T by a fuel pump (not shown) to injectors 4 of each cylinder. ing. An introduction pipe 5 for introducing fuel into the fuel distribution pipe 3 is attached to one end of the fuel distribution pipe 3, and the fuel pressure in the fuel supply passage is adjusted to a constant pressure at the other end. The pressure regulator 6 is fastened and fixed by bolts.
The pressure regulator 6 is provided with a recirculation pipe 7 for recirculating the fuel from the fuel distribution pipe 3 to the fuel tank T.

A bracket 9 is attached to the dash panel 8 behind the engine 1, a holding bracket 9b is fixed to the bracket 9 via an elastic member 9a, and a fuel filter 10 is held by the holding bracket 9b. The fuel filter 10 is connected to the fuel tank T by a fuel supply pipe 11 as a fuel supply pipe and a second fuel supply tube 11a.
Supply tube 1 is a fuel supply tube 1 as a fuel supply tube
1b to form a fuel supply path. On the other hand, the recirculation pipe 7 of the pressure regulator 6 and the fuel tank T are connected by a fuel recirculation tube 12 and a fuel recirculation pipe 12a as a fuel recirculation pipe, thereby forming a fuel recirculation path.

Therefore, after the fuel pumped from the fuel tank T by the fuel pump is introduced into the fuel filter 10 by the fuel supply pipe 11 and the second fuel supply tube 11a, the fuel is distributed through the fuel supply tube 11b. The fuel is introduced to one end of the cylinder 3 and distributed from the fuel distribution pipe 3 to the injectors 4 of the respective cylinders. When the fuel pressure in the fuel supply path becomes equal to or higher than a predetermined pressure, a pressure regulator 6 provided at the other end of the fuel distribution pipe 3 is provided.
The fuel pressure is adjusted to be constant by leaking fuel to the fuel recirculation tube 12, and the fuel is supplied to the fuel tank T by the fuel recirculation tube 12 and the fuel recirculation pipe 12 a.
Refluxed.

Here, the structure of the introduction connector 14 for connecting the fuel tube and the insertion tube at each position will be described. As shown in FIG.
An annular concave portion 15 is formed at the distal end of the small diameter portion 14a,
An elastic ring 15 a is provided in the annular recess 15. A fuel tube 16 made of resin is connected to the distal end of the small-diameter portion 14a of the introduction connector 14, and the fuel tube 16 and the introduction connector 14 are connected by an elastic ring 15a of the annular concave portion 15.
Is sealed with the small diameter portion 14a. The leading end of the large diameter portion 14c of the leading-in connector 14
The engagement claw portion 17 is formed toward the inside of. An insertion tube 18 is inserted into the introduction connector 14, and a coupling end of the insertion tube 18 reaches a middle diameter portion 14 b of the introduction connector 14. In the vicinity of the coupling end of the insertion tube 18, a ring-shaped engaging projection 18a is formed toward the outside of the insertion tube 18. This engaging projection 18a
The connection end side is an inclined surface, and the side opposite to the connection end is an engagement surface with the engagement claw portion 17 of the introduction connector 14. Between the insertion tube 18 and the large-diameter portion 14 c of the introduction connector 14, two elastic rings 20, 20 with a spacer 19 interposed therebetween, and furthermore, a bush 2 on the engagement projection 18 side.
1 and an insertion tube 18 and an introduction connector 1
4 is sealed with the large diameter portion 14c.

Here, the structure for arranging the fuel supply tube 11b and the fuel recirculation tube 12 will be described. An inlet connector 14A formed by bending the fuel supply tube 11b at a right angle downward from the upstream end is connected to the upstream end of the fuel supply tube 11b. Is inserted into the fuel filter 10 by inserting an insertion tube 10a extending upward from the upper part of the fuel filter. A bracket 13 extending upward is fixed to an upper portion of the fuel filter 10, and a clip 13a having a substantially U-shaped holding portion 13B is attached to the upper portion of the bracket 13. Nipping part 13B of this clip 13a
By sandwiching the upstream end of the fuel supply tube 11b with the fuel filter 10, the movement of the fuel supply tube 11b with respect to the insertion tube 10a is regulated. As shown in FIGS. 4A and 4B, the clip 13a includes a square insertion portion 13A that can be inserted into a square hole formed in the bracket 13, and
3 by inserting the insertion portion 13A into the square hole of the clip 1.
The rotation of 3a is fixed in a restricted form. Insertion part 13A
A substantially U-shaped holding portion 13B is provided on the upper portion of the bracket, and the fuel supply tube 11b is held between the holding portions 13B and fixed to the bracket 13.

The downstream side from the upstream end of the fuel supply tube 11b connected to the fuel filter 10 extends forward in the front-rear direction of the vehicle body, bends downward once, and then extends forward in the front-rear direction of the vehicle body. And extends to the side of one end surface of the cylinder block 1b of the engine 1. From there, it is bent upward in a substantially U shape, and then bent in the direction in which the fuel distribution pipe 3 extends. The introduction connector 14B is also connected to the downstream end of the fuel supply tube 11b, and the introduction pipe 5 attached to one end of the fuel distribution pipe 3 is inserted into the introduction connector 14B. Combined with one end. Here, on the upstream side of the fuel filter 10, an introduction connector 14C is connected to one end of the second fuel supply tube 11a, and the fuel filter 10 is connected to the introduction connector 14C.
The one end side of the second fuel supply tube 11a is connected to the fuel filter 10 by inserting the insertion tube 13b attached to the lower part of the tube. The introduction connector 14D is also connected to the other end of the second fuel supply tube 11a. The introduction connector 14D is connected to the downstream end of the fuel supply pipe 11 extending from the fuel tank T to the engine room through the lower part of the vehicle body. And connected to the fuel supply pipe 11. Further, the fuel supply pipe 11 is fixed to the dash panel 8 by the clip 22 together with the fuel recirculation pipe 12a.

On the other hand, an introduction connector 14E is connected to the downstream end of the fuel recirculation tube 12, and a fuel recirculation pipe 12a extending from the fuel tank T is inserted into the introduction connector 14E to connect the fuel recirculation tube 12 to the fuel tank T side. Combined with The coupling portion is disposed at substantially the same position as the coupling portion of the second fuel supply tube 11a with the fuel supply pipe 11, and extends forward from the coupling portion toward one end of the cylinder block 1b of the engine 1 in the vehicle longitudinal direction. Extend from there, side view (Fig. 2
Then, the fuel supply tube 11b bends in the direction in which the fuel distribution pipe 3 extends at the intersection X with the downstream side of the substantially curved shape portion 23 of the fuel supply tube 11b. And, above the fuel distribution pipe 3, the fuel distribution pipe 3
Along its upstream end, with an introduction connector 14 at its upstream end.
F is connected, and the recirculation pipe 7 of the pressure regulator 6 fixed to the other end of the fuel distribution pipe 3 is inserted into the introduction connector 14F, and is connected to the other end of the fuel distribution pipe 3.

The fuel supply pipe 11 and the fuel return pipe 12 of the fuel supply tube 11b and the fuel return tube 12
Together with the vicinity of the connecting portion to a, at the intersection X between the fuel recirculation tube 12 and the substantially U-shaped curved portion 23 downstream of the fuel supply tube 11b in a side view (see FIG. 2), the two members move together. They are connected to each other by a connecting clip 24 so as to regulate each other. This connecting clip 24 is shown in FIG.
As shown in (b), (c), (d), and (e), the first clip body 24 including the substantially U-shaped holding portion 24B
A, and a second clip body 24C having a substantially U-shaped clamping portion 24D, and the first clip body 24A
A disk 24E attached to the bottom of the second clip body 24C is inserted into an insertion hole 24F formed in the bottom of the second clip body 24C, and is connected to be relatively rotatable. The fuel supply tube 11b and the fuel recirculation tube 12 are sandwiched between the sandwiching portions 24B and 24D, respectively, and are connected to each other.

A clip 25c having a substantially C-shaped holding portion 25B is attached to a bracket 25b fastened together with a coupling bolt 25a of the cylinder block 1b and the transmission case 25, and the clip 25c
The fuel supply tube 11b is fixed to the transmission case 25 side so as to sandwich the substantially U-shaped curved portion 23 upstream of the fuel supply tube 11b and restrict the movement of the fuel supply tube 11b with respect to the introduction pipe 5. This clip 2
As shown in FIG. 6, 5c has an insertion portion 25A that can be inserted into a hole opened in the bracket 25b, and is fixed by inserting the insertion portion 25A into the hole of the bracket 25b. A substantially C-shaped holding portion 25B is provided at an upper portion of the insertion portion 25A, and the fuel supply tube 11b is held by the holding portion 25B and fixed to the bracket 25b.

Further, a clip 3b having a substantially C-shaped holding portion 3B is attached to a bracket 3a welded and fixed to the fuel distribution pipe 3 at a portion of the fuel recirculation tube 12 extending along the fuel distribution pipe 3. This clip 3
The fuel recirculation tube 12 is sandwiched by the holding portion 3B of b, and is fixed to the fuel distribution pipe 3 side so as to restrict the movement of the fuel recirculation tube 12 with respect to the recirculation pipe 7. This clip 3b is similar to the clip 25c shown in FIG.
Insertion part 3A insertable into hole opened in bracket 3a
And fixed by inserting the insertion portion 3A into the hole of the bracket 3a. A substantially C-shaped holding portion 3B is provided on an upper portion of the insertion portion 3A, and the fuel recirculation tube 12 is sandwiched from the side by the holding portion 3B and fixed to the bracket 3a.

Next, the operation of the present embodiment will be described. During engine operation, the engine body (cylinder head 1a and cylinder block 1b) rotates in the vehicle longitudinal direction about the output shaft of the engine 1 as a rotation axis. As a result, the relative position with respect to the vehicle body fluctuates. Further, the relative position of each other also fluctuates due to micro vibrations on the engine body side or the vehicle body side. Furthermore, the relative position also fluctuates in the relationship between the engine body and the intake manifold 2 attached to the cylinder head 1a. In the fuel pipe structure of the present embodiment, both the fuel supply tube 11b and the fuel recirculation tube 12 are routed from one end of the fuel distribution pipe 3, and the fuel recirculation tube 12 is connected to the other end of the fuel distribution pipe 3. Is fixed to the fuel distribution pipe 3 side just before the connecting portion. At the same time, the fuel supply tubes 11b are connected to each other just before the connecting portion on one end side of the fuel distribution pipe 3. In addition, the fuel supply tube 11b is fixed to the transmission case 25 side from a connection portion with the fuel recirculation tube 12 to an upstream side thereof via a substantially L-shaped curved portion 23 as an elastic portion.

Therefore, the fuel recirculation tube 12 can be fixed to the fuel distribution pipe 3 side before the connecting portion at the other end of the fuel distribution pipe 3, and the recirculation pipe 7 of the pressure regulator 6 and the fuel recirculation tube 12 can be fixed. Relative to the introduction connector 14F is determined, and vibration input to the coupling portion due to a change in the relative position between the engine 1 and the vehicle body is suppressed. The fuel supply tube 11b is connected to the fuel recirculation tube 1
2, and a change in the relative position between the introduction pipe 5 and the introduction connector 14B of the fuel supply tube 11b is suppressed via a fixing portion of the fuel recirculation tube 12 to the fuel distribution pipe 3 side. . The movement of the fuel recirculation tube 12 in the middle thereof, which is relatively long, is restricted, and the vibration input to the coupling portion at the other end of the fuel distribution pipe 3 is further suppressed.
Further, by fixing the fuel supply tube 11b to the transmission case 25 side before the connecting portion at one end of the fuel distribution pipe 3, the fuel supply tube 11b is made rigid by the fuel to be pumped and is easily transmitted. Micro vibrations from the vehicle body can be reliably attenuated by the rigid transmission case 25, vibration input to the coupling portion at one end of the fuel distribution pipe 3 can be suppressed, and the transmission case can be suppressed by the expansion and contraction of the substantially V-shaped curved portion 23. Vibration input to the joint due to a change in the relative position between the intake manifold 25 and the intake manifold 2 can also be suppressed. As a result, the deformation stress acting on the elastic ring 20 can be efficiently reduced in a limited space, and the life of the elastic ring 20 can be extended.

In this embodiment, introduction connectors 14B and 14F are provided on the side of the fuel supply tube 11b and the fuel recirculation tube 12, and the introduction pipe 5 and the recirculation pipe 7 as insertion tubes are provided on the fuel distribution pipe 3 side. Is provided, but the reverse is also possible.

The fuel recirculation tube 12 is fixed to the fuel distribution pipe 3 at the other end of the fuel distribution pipe 3 at the other end, but may be fixed to the intake manifold 2.
In addition, although the upstream side of the substantially U-shaped curved portion 23 of the fuel supply tube 11b is fixed to the transmission case 25 side, it may be fixed to the rigid engine body side.

[0030]

As described above, according to the first aspect of the present invention, one of the two fuel pipes has one end on the fuel distribution pipe side and one end on the fuel distribution pipe. By inserting the insertion pipe provided at the section into the introduction connector provided at the other end, the one fuel pipe is rotatably connected to the fuel distribution pipe via an elastic ring. The other fuel pipe of the two fuel pipes has a fuel distribution pipe side portion extending along the fuel distribution pipe from one end of the fuel distribution pipe to the other end thereof, and the fuel distribution pipe of the other fuel pipe. By inserting the insertion pipe provided at one end into the introduction connector provided at the other end, the other fuel pipe is connected to the fuel end by the pipe side end and the other end of the fuel distribution pipe. While being rotatably connected to the distribution pipe via an elastic ring, both fuel pipes The other fuel pipe is fixed to the vehicle in the middle between the fuel tank and the fuel distribution pipe, and the other fuel pipe is an independent intake pipe or fuel distribution pipe at a fuel distribution pipe side portion extending along the fuel distribution pipe. The one fuel pipe is fixed to the pipe, and the one fuel pipe is connected to the other fuel pipe between the fixed portion to the vehicle and the fuel distribution pipe side end, so that the other fuel pipe follows the fuel distribution pipe. Can be fixed to the fuel distribution pipe or the independent intake pipe at the extended fuel distribution pipe side, and one fuel pipe is connected to the other fuel pipe between the fixed part to the vehicle and the fuel distribution pipe side end. it can. This allows each fuel pipe to be fixed to the engine between the fixed part to the vehicle and the end on the fuel distribution pipe side in a limited space, and to the connection part due to a change in the relative position between the engine side and the vehicle body side. And the life of the elastic ring can be prolonged.

Also, the other relatively long fuel pipe is connected to one fuel pipe between the fixed portion to the vehicle and the independent intake pipe or the fixed portion to the fuel distribution pipe, so that the fuel distribution pipe Vibration input to the side end can be further suppressed.

Further, the other relatively long fuel pipe is connected to the one fuel pipe in the middle thereof, so that the vibration input to the connection can be further suppressed. According to the invention of claim 2, one fuel pipe is fixed to the transmission case or the engine body between the fixed part to the vehicle and the connection part to the other fuel pipe, and is connected to the connection part and the transmission case or the engine body. By providing a telescopic part that can expand and contract with the fixed part of the vehicle, one fuel pipe is fixed to the transmission case or the engine body with the telescopic part from the connection part with the other fuel pipe, so that the engine side and the vehicle body Vibration input to the fuel distribution pipe end of one fuel pipe due to fluctuations in the relative position to the side can be reliably suppressed, and the relative fluctuation between the transmission case or engine body and the independent intake pipe can be absorbed by the expansion and contraction section. Vibration input to the fuel pipe side end of one fuel pipe can be further suppressed.

According to the third aspect of the present invention, the end of the fuel supply pipe on the side of the fuel distribution pipe and the fuel distribution pipe are inserted by inserting the insertion pipe provided on one side into the introduction connector provided on the other side. The fuel supply pipe is rotatably connected to the fuel distribution pipe via an elastic ring, while the fuel supply pipe is fixed to the vehicle at an intermediate position between the fuel tank and the fuel distribution pipe. The fuel supply pipe is fixed to the transmission case or the engine body between the fixed portion to the vehicle and the fuel distribution pipe side end, so that the fuel supply pipe is supplied with fuel from the fuel tank by pressure and becomes rigid. By fixing to the transmission case or the engine body between the fixed part to the vehicle and the end of the fuel distribution pipe side, minute vibrations from the vehicle body side can be reliably suppressed by the rigid transmission case or the engine body. Capable of prolonging the life of the elastic ring.

[Brief description of the drawings]

FIG. 1 is a front view of a fuel pipe structure according to an embodiment of the present invention.

FIG. 2 is a side view of the fuel pipe structure according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing an introduction connector as a fuel tube coupling device.

4A is a side view of the clip, and FIG. 4B is a bottom view of the clip.

5A is a side view of a connecting clip, and FIG.
(C) is a bottom view of the first clip body, (d) is a side view of the second clip body,
(E) is a bottom view of the second clip body.

FIG. 6 is a side view of the clip.

[Explanation of symbols]

 Reference Signs List 1 engine 2 intake manifold 3 fuel distribution pipe 3a bracket 3b clip 11 fuel supply pipe 11a second fuel supply tube 11b fuel supply tube 12 fuel recirculation tube 12a fuel recirculation pipe 14 introduction connector 23 curved part 24 connection clip 25b Bracket 25c clip

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16L 37/10 B60K 15/02 C

Claims (3)

[Claims] A fuel tank for storing fuel; and a fuel distribution pipe extending in a cylinder arrangement direction for distributing fuel to each cylinder and fixed to an independent intake pipe extending to each cylinder. The fuel pipe connecting between the fuel tank and the fuel distribution pipe includes a fuel supply pipe for supplying fuel from the fuel tank to the fuel distribution pipe, and a fuel recirculation pipe for recirculating fuel from the fuel distribution pipe to the fuel tank. In the fuel pipe structure of the engine, one of the two fuel pipes has a fuel distribution pipe side end and one end of the fuel distribution pipe connected to an insertion pipe provided at one end. The one fuel pipe is rotatably connected to a fuel distribution pipe via an elastic ring by being inserted into an introduction connector provided at an end, and the other fuel pipe of the two fuel pipes is connected to the fuel pipe. Distributes the fuel distribution pipe side The fuel pipe extends from one end side to the other end side along the fuel distribution pipe, and the other end of the other fuel pipe on the fuel distribution pipe side and the other end of the fuel distribution pipe are provided at one end. By inserting the insertion pipe into the introduction connector provided at the other end, the other fuel pipe is rotatably connected to the fuel distribution pipe via an elastic ring, while A pipe is fixed to the vehicle at an intermediate portion between the fuel tank and the fuel distribution pipe, and the other fuel pipe is an independent intake pipe or a fuel distribution pipe side portion extending along the fuel distribution pipe. A fuel pipe structure for an engine, the fuel pipe being fixed to a fuel distribution pipe, wherein the one fuel pipe is connected to the other fuel pipe between a fixing portion to the vehicle and the fuel distribution pipe side end. 2. One of the fuel pipes is fixed to a transmission case or an engine main body between a fixing part to the vehicle and a connection part to the other fuel pipe, and the connection part is fixed to the transmission case or the engine main body. 2. A fuel pipe structure for an engine according to claim 1, further comprising an expandable portion that can expand and contract between the fuel pipe and the engine. 3. A fuel tank, comprising: a fuel tank for storing fuel; and a fuel distribution pipe formed to extend in a cylinder arrangement direction to distribute fuel to each cylinder and fixed to an independent intake pipe extending to each cylinder. The fuel pipe connecting between the fuel tank and the fuel distribution pipe includes a fuel supply pipe for supplying fuel from the fuel tank to the fuel distribution pipe, and a fuel recirculation pipe for recirculating fuel from the fuel distribution pipe to the fuel tank. In the fuel pipe structure of the engine, the fuel supply pipe is connected to the fuel supply pipe end by inserting the insertion pipe provided on one side into the introduction connector provided on the other side. While the pipe is rotatably connected to the fuel distribution pipe via an elastic ring, the fuel supply pipe is fixed to the vehicle at an intermediate portion between the fuel tank and the fuel distribution pipe, and the fuel supply pipe is fixed to the vehicle. Supply pipe is the above vehicle Fuel pipe structure for an engine, characterized in that fixed to the transmission case or engine body between the fixed portion and the fuel distribution pipe end of.