JPH0749005Y2 - Fuel dispipe mounting structure - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a mounting structure for a fuel pipe.

"Prior Art" Conventionally, as a structure for attaching a fuel supply pipe (fuel dispipe) to an engine, for example, JP-A-60-90973 is used.
There is one shown in Japanese Patent Publication.

In the structure of this publication, the engine is a V-type engine composed of a first bank having three cylinders and a second bank having three cylinders, and each cylinder of each bank is a cylinder. It is composed of a block and a cylinder head attached to the upper surface of the cylinder block. A surge tank for the second bank is arranged above the first bank, and the surge tank for the second bank is provided in each cylinder of the second tank via the independent intake passage for the second bank. It communicates with the intake port of the cylinder head. Similarly, a surge tank for the first bank is arranged above the second bank, and the surge tank for the first bank is connected to the first bank via the independent intake passage for the first bank. It communicates with the intake port of the cylinder head of each cylinder.

Each of the first bank independent intake passages has a first
A bank fuel injection nozzle is provided, and similarly, a second bank fuel injection nozzle is provided in each of the second bank independent intake passages.

Further, in order to supply fuel to each of the fuel injection nozzles,
A fuel supply pipe is provided in the engine. The fuel supply pipe is branched in the middle to form a first bank fuel supply pipe and a second bank fuel supply pipe, and the first bank fuel supply pipe is the first bank fuel injection nozzles. Similarly, the fuel supply pipe for the second bank communicates with each of the fuel injection nozzles for the second bank.

The first bank fuel supply pipe and the second bank fuel supply pipe are arranged in parallel with the crankshaft, above the first bank independent intake passage and above the second bank independent intake passage, respectively. There is. Further, the first bank independent intake passage extends upward of the second bank, and similarly, the second bank independent intake passage extends upward of the first bank.

Therefore, when the first bank fuel supply pipe and the second bank fuel supply pipe are attached to the first bank independent intake passage and the second bank independent intake passage, respectively, these independent intake passages are not obstructive. The attachment can be easily performed.

[Problems to be Solved by the Invention] In addition to the above structure, a surge tank for the first bank is arranged above the first bank as a V-type engine,
Similarly, a surge tank for the second bank may be arranged above the second bank. Then, the surge tank for the first bank communicates with the intake port of the cylinder head of each cylinder of the first bank through the independent intake passage for the first bank which is curved in the middle, and similarly, the surge tank for the second bank similarly. The surge tank for communication communicates with the intake port of the cylinder head of each cylinder of the second bank via the curved second bank independent intake passage.

Each of the first bank independent intake passages has a first
A bank fuel injection nozzle is provided, and similarly, a second bank fuel injection nozzle is provided in each of the second bank independent intake passages. Further, the first bank fuel supply pipe communicates with each of the first bank fuel injection nozzles, and similarly, the second bank fuel supply pipe communicates with each of the second bank fuel injection nozzles. There is. The fuel supply pipe for the first bank and the fuel supply pipe for the second bank are arranged in parallel with the crankshaft.

Here, the first bank fuel supply pipe and the second bank fuel supply pipe are below the upstream side portion of the first bank independent intake passage and below the upstream side portion of the second bank independent intake passage, respectively. Is located in.

Therefore, the first bank fuel supply pipe and the second bank fuel supply pipe are connected to the first bank independent intake passage and the second bank fuel intake pipe, respectively.
When bolting the bank independent intake passages from above, the upstream side portions of these independent intake passages become an obstacle. Therefore, there are problems that the mounting location is limited, the mounting becomes difficult, and the assembling property of the fuel supply pipe is poor.

An object of the present invention is to provide a mounting structure for a fuel dispipe that can improve the assemblability of the fuel dispipe.

[Means for Solving the Problems] The present invention includes a cylinder head and an independent intake passage communicating with an intake port of the cylinder head, wherein the independent intake passage is curved midway and upstream thereof. The side portion is located above the own cylinder head, a mounting seat is formed on the downstream side of the independent intake passage, and the mounting surface of the mounting seat is mounted on the cylinder head. A fuel dispipe is mounted on the seat via a mounting portion, and the fuel dispipe is
In the attachment structure of the fuel discharge pipe arranged below the upstream side portion of the independent intake passage, the fuel discharge pipe may be attached via the attachment portion by a bolt from the attachment surface side of the attachment seat. Characterize.

[Operation] In the present invention, the fuel discharge pipe is attached through the attachment portion by the bolt from the attachment surface side of the attachment seat.

Therefore, even in the structure in which the fuel discharge pipe is arranged below the upstream side portion of the independent intake passage, the upstream side portion of the independent intake passage does not obstruct the attachment of the fuel discharge pipe.

Therefore, the mounting location is not limited, the mounting is easy, and the assemblability of the fuel discharge pipe can be improved.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an engine to which a fuel dispipe mounting structure according to an embodiment of the present invention is applied, and FIG. 1 is a sectional view taken along the line II of FIG. Also, the second
The figure shows the structure of FIG. 1 viewed from the direction II-II.

In FIGS. 1 and 2, the engine is a V-type 6-cylinder engine, the first bank 10 has three cylinders 12, 12, 12, and similarly, the second bank 14 has three cylinders 16. , 16,
Has 16.

The cylinder 12 of the first bank 10 includes a cylinder block 18 and
And a cylinder head 20 attached to the upper surface of the cylinder block 18. A fuel chamber 22, an intake port 24 communicating with the fuel chamber 22, and an exhaust port 26 are formed in the cylinder head 20, and the intake port 24 and the exhaust port 26 are respectively provided with an intake valve 28 and an intake valve 28. The exhaust valve 30 opens and closes the fuel chamber 22. In addition,
A spark plug 32 is arranged in the fuel chamber 22. Also,
The exhaust port 26 communicates with the exhaust manifold 34.
A fuel injection valve 36 is arranged in the intake port 24. The reference numerals 38 and 40 denote cylinder head covers.

Similarly, the cylinder 16 of the second bank 14 is composed of a cylinder block 42 and a cylinder head 44 mounted on the upper surface of the cylinder block 42.
A fuel chamber 46, an intake port 48 communicating with the fuel chamber 46, and an exhaust port 50 are formed in the cylinder head 44, and the intake port 48 and the exhaust port 50 are respectively
The intake chamber 52 and the exhaust valve 54 open and close the fuel chamber 46. An ignition plug 56 is arranged in the fuel chamber 46. Further, the exhaust port 50 communicates with the exhaust manifold 58. A fuel injection valve 60 is arranged in the intake port 48. Reference numerals 62 and 64 represent cylinder head covers.

A surge tank 66 for the first bank 10 is arranged above the first bank 10, and similarly the second bank 14
A surge tank 68 for the second bank 14 is disposed above the.

Then, the surge tank 66, via the independent intake passage 70,
Intake port of cylinder head 20 of cylinder 12 of first bank 10
Similarly, the surge tank 68 communicates with the intake port 48 of the cylinder head 44 of the cylinder 16 of the second bank 14 via the independent intake passage 72. Here, each of the independent intake passages 70 and 72 is curved and has a portion on the upstream side thereof.
70a, 72a are located above the cylinder heads 20, 44.

In the first bank 10, a mounting seat 74 is formed on the downstream side 70b of the independent intake passage 70, and the mounting surface 74a of the mounting seat 74 is
It is attached to a mounting surface 20a of the cylinder head 20 with a bolt (not shown). Similarly, in the second bank 14, a mounting seat 76 is formed on the downstream side 72b of the independent intake passage 72, and the mounting surface 76a of the mounting seat 76 has the mounting surface 76a.
It is attached to the attachment surface 44a of 4 with bolts 78.

Hereinafter, the mounting structure of the fuel discharge pipe in the first bank 10 will be described, but the mounting structure of the fuel discharge pipe in the second bank 14 is also the same.

In the first bank 10, reference numeral 80 denotes a fuel dispipe, which is parallel to a crankshaft (not shown) and is located below the upstream portion 70a of the independent intake passage 70. It is arranged. Note that fuel is supplied to the fuel discharge pipe 80 via the pressure regulator 82.

The fuel discharge pipe 80 has a mounting portion 84 at the bottom thereof.
The fuel-dissip pipe 80 has a
It is attached to the attachment surface 74b of the attachment seat 74 opposite to the cylinder head 20 via 84. Here, the fuel dispipe 80 is attached to the attachment surface 74b of the attachment seat 74 via the attachment portion 84 by the bolt 86 from the attachment surface 74a of the attachment seat 74 on the cylinder head 20 side. .

Therefore, the upstream portion 70a of the independent intake passage 70 does not hinder the attachment of the fuel discharge pipe 80,
Therefore, the assemblability of the fuel discharge pipe 80 can be improved.

On the mounting surface 20a of the cylinder head 20, the bolt 8
A relief recess 88 for preventing interference with the head portion 86a of 6 is formed. Further, in order to prevent the heat of the cylinder head 20 from being transferred from the cylinder head 20 to the fuel discharge pipe 80, the head 86a of the bolt 86 and the mounting surface 74a of the mounting seat 74 are mounted.
An insulator 90 for heat insulation is arranged between and, and an insulator 92 for heat insulation is arranged between the mounting portion 84 and the mounting surface 74b of the mounting seat 74.

As shown in FIG. 2, the mounting portion 84 of the fuel discharge pipe 80 is arranged in a wide area between the fuel injection valves 36, 36, and thus the mounting portion 84 for the mounting portion 84 is wide. The mounting area is secured.

Next, FIGS. 3 and 4 show a front cross section and a plane of a mounting structure for mounting the surge tank on the bank, respectively.

The surge tank 66 is arranged above the first bank 10, and similarly, the surge tank 68 is arranged above the second bank 12.

Hereinafter, the mounting structure of the surge tank 66 in the first bank 10 will be described, but the mounting structure of the surge tank 68 in the second bank 12 is also the same.

The surge tank 66 is attached to a portion 94 having the highest rigidity in the cylinder head 20 (this portion 94 is a portion that connects the intake system and the exhaust system in the cylinder head 20). That is, the upper end 100a of the bracket 100 is attached to the one end 97 of the surge tank 66 by the bolts 96 and 98, and the lower end 100b of the bracket 100 is attached to the most rigid part 94 of the cylinder head 20 by the bolt 102. Is attached to. Similarly, the upper end 110a of the bracket 110 is attached to the other end 104 of the surge tank 66 with bolts 106 and 108, and the lower end 110b of the bracket 110 is attached.
Are attached to the stiffest portion 94 of the cylinder head 20 by bolts 112.

By mounting the surge tank 66 on the most rigid portion 94 of the cylinder head 20 via the brackets 100 and 110 in this manner, vibration of the surge tank 66 can be prevented. By preventing the vibration of the surge tank 66, the reliability of the throttle body 114, the throttle shaft 116 and the like coupled to the surge tank 66 can be improved. Also, surge tank
By preventing the vibration of 66, the downstream side 70b of the independent intake passage 70 connected to the surge tank 66 and the cylinder head 2
The sealability with the mounting surface 20a of 0 can be reliably maintained.

[Advantages of the Invention] As described above, according to the present invention, the fuel discharge pipe is attached through the attachment portion by the bolt from the attachment surface of the attachment seat on the cylinder head side. Therefore, the assemblability of the fuel dispipe can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an engine to which a fuel dispipe mounting structure according to an embodiment of the present invention is applied. FIG. 1 is a sectional view taken along the line I--I of FIG. 2, and FIG. FIGS. 3 and 4 are a front sectional view and a plan view of a mounting structure for mounting a surge tank on a bank, respectively, as viewed from the −II direction. 10 …… First bank, 12, 12, 12 …… Cylinder, 14 …… Second bank, 16,16,16 …… Cylinder, 18 …… Cylinder block,
20 …… Cylinder head, 20a …… Mounting surface, 42 …… Cylinder block, 44… Cylinder head, 44a …… Mounting surface, 66
...... Surge tank, 68 …… Surge tank, 70 …… Independent intake passage, 72 …… Independent intake passage, 70a …… Upstream side part, 72a
...... Upstream side, 74 …… Mounting seat, 74a …… Mounting surface, 74b…
… Mounting surface, 76 …… Mounting seat, 76a …… Mounting surface, 80 …… Fuel dispipe, 84 …… Mounting part, 86 …… Bolt, 86
a: head, 88: relief recess, 90, 92: insulator for heat insulation.

Claims (1)

[Scope of utility model registration request] 1. A cylinder head, and an independent intake passage communicating with an intake port of the cylinder head, wherein the independent intake passage is curved midway and an upstream side portion thereof is the cylinder of its own. A mounting seat is formed above the head, the mounting seat is formed on the downstream side of the independent intake passage, and the mounting surface of the mounting seat is mounted on the cylinder head. Is attached via a mounting portion, and the fuel dispipe is
In the mounting structure of the fuel dispipe arranged below the upstream side portion of the independent intake passage, the fuel dispipe may be mounted via a mounting portion by a bolt from the mounting surface side of the mounting seat. Characteristic fuel dispipe mounting structure.