JPS59200062A - fuel injector - Google Patents

Abstract

PURPOSE:To improve mounting efficiency, by a method wherein the middle part of each fuel injection valve is held by a retainer body through the medium of a shock absorbing material and each rear end part is fitted in an engaging hole in a fuel feed body through a seal member, to form an integrated unit. CONSTITUTION:Plural fuel injection valves V1 are held at the middle part thereof by a retainer part H1 through the medium of a shock absorbing material 25, and the respective rear end parts are disposed to the respective corresponding mounting parts M1 of a fuel feed body 5. With an O ring 21 and a sleeve 23 mounted, a retainer body 24 is tightly fixed to a fuel feed body 5 by means of a bolt, each rear end part is coupled to a first fuel passage 8 with liquid tightness, and under this condition, a pressure resisting test is practicable. Under integrated condition, the forward end of each fuel injection valve V1 is mated with the corresponding hole 16 in a suction passage 3 through the medium of a seal material 4, and each support arm 11 is tightly fixed to a support stand 12 through the medium of a heat insulating material 14 by means of a bolt 13. This causes facilitation of both mounting and disassembling works.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method in which the rear ends of a plurality of fuel injection valves whose tips are fully inserted into intake passages corresponding to each cylinder of a multi-cylinder engine are commonly connected to a fuel discharge path of a fuel supply body. The present invention relates to a connected fuel injection device.

Conventionally, in such a fuel injection device, each fuel injection valve is supported under pressure by a fuel supply body and an intake manifold. Therefore, during assembly or disassembly, each fuel injector must be separated, making assembly or disassembly work troublesome. In addition, when the fuel supply body and intake manifold are completely separated, each fuel injector is not completely attached to the fuel supply body, so a pressure resistance test is performed with each fuel injector attached to the fuel supply body. If it was difficult and inconvenient to implement.

The present invention has been made to solve such conventional technical problems.The present invention has been made in order to solve such conventional technical problems. It is an object of the present invention to provide a complete fuel injection device in which a pressure test can be easily carried out in a state where the fuel injection device is attached to a fuel supply body.

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. First, in FIGS.
One end of the i is connected via a bolt 1 (~), whereby the corresponding intake passage 3 of the intake manifold Mi communicates with the intake port 2 of each intake port. A throttle body and an air cleaner are sequentially connected through an expander (not shown) through which each intake passage 3 communicates in common.A hole 16 is formed in one end of the intake manifold M1 corresponding to each cylinder. teeth, .

Fuel injection valve VI + ■2 + V3 corresponding to each cylinder
The tips of +v4 are inserted through the sealing material 4, respectively. The rear end of each of the fuel injection valves V, ~ 4 is made of aluminum alloy, for example, and is connected to a main body 6 that extends long along the arrangement direction of each cylinder of the engine main body E, and one end of the main body 6. It consists of a cap 7 that is fixed and removed. A first fuel passage 8 is formed in the main body 6 over its entire length, and a second fuel passage 9 is formed in parallel with the first fuel passage 8 from the one end to the middle part, and the first and second fuel passages are connected to each other. The passages 8.9 communicate with each other by fixing a cap 7 to one end of the body 6. A connecting joint 10 is connected to the first fuel passage 8 at the other end of the main body 6, and a fuel supply pipe (not shown in the figure □) is connected to this connecting joint 10. Further, a pressure regulating valve (not shown) is connected to the second fuel passage 9 in the middle part of the main body 6, and the fuel pressure in the first and second fuel passages 8, 9 is kept constant by the function of this pressure regulating valve. is maintained.

In the case where the engine body E is equipped with a sub-combustion chamber, the sub-fuel nozzle is connected to the second fuel passage 9 together with the pressure regulating valve, and the fuel ejected from the sub-fuel nozzle is supplied to the sub-combustion chamber of each cylinder. Ru.

A plurality of support arms 11 are protruded from the fuel supply body 5.
Each support arm 11 is fixed by a support sleeve 12i' (g bolt 13) integrally provided to the intake manifold M1. Moreover, a heat insulating material 14 is interposed between the intake manifold Mi and the support arm 11. The heat insulator 14 transfers the heat of the intake manifold M1 to the first and second fuel passages 8, 9.
prevent any negative impact on the fuel. In this way, the fuel supply body 5 has 15 connector parts. Each of the fuel injection valves V1 to V4 opens by applying an electric pulse to an internal sonoid (not shown) from the wiring connected to the wiring connector 15.

The fuel supply body 5 is provided with several parts M1 to M4 corresponding to each cylinder of the engine body E, and each fuel injection valve v1.
~v4 are individually attached to the corresponding attachment portions M1 to M4. The multi-section structure will be described, but since the structures of the respective mounting parts M, to M4 are all the same, the tf7j structure of the multi-section section M3 will be described as a representative.

In FIG. 4, a fitting hole 17 that is coaxial with the axis of the fuel injection valve v3 is bored in the mounting portion M3, and the bottom of the fitting hole 17 is connected to the first fuel passage through a communication hole 18 that is coaxial. It connects to 8. On the other hand, at the rear end portion of the fuel injection valve v3, a short cylindrical portion 19 and an outer flange portion 20 having a larger diameter than the short cylindrical portion 19 are provided in order from the rear end side. Between the bottom of the fitting hole 17 and the outer flange part 20, a QIJ song 1 serving as a sole part that completely surrounds the short cylindrical part 19 is inserted. The thickness of the O-ring 21 at maximum compressive deformation is selected to be slightly larger than the length of the short cylindrical portion 19, so that the thickness of the O-ring 21 is selected to be slightly larger than the length of the short cylindrical portion 19. The end of the short cylindrical portion 19 does not come into contact with the bottom of the fitting hole 17 when the short cylindrical portion 19 is pressed.

A sleeve 23 is inserted between the rear end of the fuel injection valve V and the inner surface of the fitting hole 17, and the sleeve 23 has an inner flange 22 at one end that can come into contact with the outer surface of the IJ song 1. Due to this function, the axes of the communication hole 18 and the fuel injection valve V3 are aligned.

The remaining few phrases M, , M2. M4 and fuel injection valve V1.
V2. All the rear end portions of V3 are similar in structure to the aforementioned mounting portion M3 and fuel injection valve V3, and each fuel injection valve V1 to
■4 are all held by the holding body 24, and when the holding body 24 is fastened to the fuel supply body 5, each fuel injection valve ■1 to v4
is attached to the fuel supply body 5.

In FIGS. 5 and 6, the holder 24 has a rigidity ')
The fuel supply body 5 is formed by casting, for example, an aluminum alloy, and is formed long along the longitudinal direction of the fuel supply body 5. This holding body 24 is provided with cylindrical holding parts H1 to H4 at positions corresponding to the respective fuel injection valves V, ~v4, and cylindrical vibration absorption gain 25 is provided in these holding parts H1 to H6. Fuel injection valves (1) to (4) are respectively inserted through them. Moreover, the tip side of the holding parts H1 to H4, that is, the intake manifold Mi 1
111 is provided with support flanges 26 that protrude radially inward, and both ends of the vibration absorbing material 25 are connected to the support flanges 26.
6 and fuel) Each of the injection valves (1) to (2) abuts against a shoulder 27 provided in the middle.
,) Between each holding part H1 to H1 of the holding body 24,
A connecting portion 27 is provided facing the side surface of the intake manifold Mi side of the fuel supply body 5, and a bolt passing through the connecting portion 27 is screwed into the fuel supply body 5 to connect the fuel supply body 5. The holding body 24 is tightened.

Next, to explain the operation of this embodiment, when installing each fuel t1 injection valve v1 to V4, each fuel injection valve V
1 to V4 are held in the intermediate part H.

- Each heating charge 1 is maintained at H4 via the vibration absorption gain 25.
The rear end portions of the injection valves v1 to V4 are attached to each mounting portion M of the fuel supply body 5.
,~M A, and O-ring 21 and sleeve 2.
With the three pieces attached, the holder 24 is fastened to the fuel supply body 5 with bolts 28.

As a result, the rear end portions of each of the fuel injection valves V, to ①A are fluid-tightly connected to the first fuel passage 8.

In this state, each of the fuel injection valves 1 to V4 and the fuel supply body 5 are integrated, and it is possible to carry out the pressure resistance 1li.

In this integrated state, each fuel injection valve v1 to V
The tip of 4 is attached to each hole 16 through a seal 4, and each support arm 1 is connected through an insulated bolt 14 through a bolt 13.
1. Fasten to the grape support stand 12.

As a result, the tip of each fuel injection valve ■1 to v4 is connected to the hole 16.
are inserted into each.

In the above-mentioned embodiment, the fuel injection valves v1 to V4 are inserted into the intake manifold MI, but in the present invention, each fuel injection valve VI=V<k is attached to the engine body E, and the intake manifold MI is inserted into the intake manifold MI. It can also be implemented in connection with what causes the tip to plunge into the port 2.

As described above, according to the present invention, in each fuel injection valve, 1ii
The J section is held by a holder that is fastened to the fuel supply body through a vibration absorbing material, and the rear end of each fuel injector is connected to a plurality of holes bored in the fuel supply body so as to communicate with the fuel passage. Since the fuel supply body and the plurality of fuel injection valves are fitted into the fitting holes through the seal members, the fuel supply body and the plurality of fuel injection valves are integrated into a unit.
Assembly and disassembly work becomes extremely easy, and a pressure test can be performed with all fuel injection valves attached to the fuel supply body. 1. The fuel supply body and the holding body (are made up of different rigidities, so durability is improved. 3.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which FIG. 1 is a partially cutaway side view, FIG. 2 is a plan view seen from the arrow ■ in FIG. 1, and FIG. 3 is a diagram showing FIG. Fig. 4 is an enlarged sectional view taken along the line IV-IV of Fig. 2, and Fig. 5 is a side view of the
A front view seen from arrow V in the figure, FIG. 6 is Vl − of FIG. 2.
It is a sectional view taken along the Vf line. 3... Intake passage, 5... Fuel supply body, 8...
First fuel passage, 9... Second fuel passage, 17...
Fitting hole, 21... O-link as a sealing member (24
... Holding body, 25 ... Vibration absorbing material, ■1 to v4 ・
・・Fuel injection valve

Claims (1)

[Claims] In a fuel injection device 1t, in which rear end portions of a plurality of fuel injection valves whose tips protrude into intake passages corresponding to respective cylinders of a multi-cylinder engine are commonly connected to a fuel passage of a fuel supply body, the fuel supply body is made of a rigid material and extends along the longitudinal direction of the fuel supply body, and the middle part of each fuel injection valve is made of a rigid material and extends along the longitudinal direction of the fuel supply body, and is formed of a rigid material. Each of the fuel injection valves is held by a holder that is fastened to the body via a vibration absorbing material, and the rear end portion of each of the fuel injection valves is connected to a plurality of fitting holes formed in the fuel supply body so as to communicate with the fuel passage trap. and a fuel injection device, each of which is inserted through a seal part.