JPS6353386B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting device for a fuel nozzle in a multi-cylinder engine.

Conventionally, this kind of fuel nozzle mounting device has been used, for example, to insert each fuel nozzle through each holder to the outside of each engine member that constitutes the intake passage of each cylinder of a multi-cylinder engine, and to attach the fuel nozzle to the outside of each engine member. A device is known in which a continuous fuel pipe is provided, but such a mounting device is such that all fuel nozzles for multiple cylinders are inserted in advance into each engine member via each holder, and Later, the fuel piping is provided to each fuel nozzle, and in this case, each holder is generally structured to fix only the front end of each nozzle to each engine member, so only the front end is attached to each engine member. When the fuel pipes are attached to the rear ends of the fixed nozzles, these nozzles are unstable and assembly is difficult.
In order to eliminate this inconvenience, in Japanese Patent Application No. 56-175616 filed by the present applicant, each holder has flanges at the front and rear in the insertion direction of the fuel nozzle, and the nozzle is inserted into each of the flanges. The nozzle is configured with a hole, the front and rear flanges support both front and rear ends of the nozzle, each front flange is connected to and attached to each engine member at its front surface, and the rear surface of each rear flange is It has been proposed to attach a fuel pipe to the holder, but the flanges of each holder require precision finishing on the front and rear surfaces, and improvement in workability is desired. Furthermore, since it would be time-consuming to attach each nozzle to each engine member via each separate holder, further improvement in assemblability is desired.

The purpose of the present invention is to obtain a device that satisfies such demands, and the present invention has been made to provide a device that includes a
In a fuel nozzle mounting device, each fuel nozzle and a fuel pipe connected to the fuel nozzle are provided through each holder having a U-shaped cross section and having a side plate and flanges on the front and rear sides of the side plate. The fuel nozzles are formed into an integral frame body, the front and rear flanges are arranged so that the front and rear surfaces are on the same plane, and the fuel nozzles are fitted into stepped portions formed on the nozzles. It is characterized in that it fits into a nozzle insertion hole formed in each of the flanges through a seal ring.

Next, embodiments of the present invention will be described with reference to attached drawings.

In the drawings, reference numeral 1 indicates a multi-cylinder engine, for example, a four-cylinder engine, and each fuel nozzle 3 is connected to the outside of each engine member via each holder 2 on the outside of each engine member constituting the intake passage of each cylinder 1a of the engine 1. A fuel pipe 4 is provided. The engine members include each intake port 1b of each cylinder 1a of the engine 1 or each branch pipe 1c of an intake manifold extending from the intake port 1b.
In the illustrated example, each branch pipe 1c of the intake manifold is used as each engine member, as shown in FIG. The fuel pipe 4 is provided. In this case, the nozzles 3 are arranged horizontally in four rows at intervals as shown in the figure, and the fuel pipes 4 are connected to a common common pipe as shown in the figure. It was one piece. The holders 2, which are arranged in parallel at intervals, are, for example, U-shaped and have flanges 2b, 2b on the side plate 2a at the front and rear in the insertion direction of the fuel nozzle 3, as clearly shown in FIG. It is configured to have front and rear insertion holes 5, 5. Here, according to the present invention, each of the holders 2 arranged in parallel with an interval is constituted by a single frame 6, and each flange 2b in front of each holder 2 has a front surface thereof. In the illustrated frame body 6, the holders 2 are arranged so that they are on the same plane, and the flanges 2b at the rear of each holder 2 are arranged so that their rear surfaces are on the same plane. The entire frame including the side plate 2a and the front and rear flanges 2b, 2b is constructed of a U-shaped frame that is longitudinal in the horizontal direction and is continuous with each other, and a rib 7 is arranged between each holder 2 to form the frame. The body 6 is reinforced. In the illustrated example, each holder 2 is made up of a continuous integral frame 6, but only the side plate 2a, only the front flange 2b, only the rear flange 2b, or any of these It is also possible to construct a single frame body 6 by making several parts continuous. Further, each nozzle 3 has small diameter portions 9, 9 formed by attaching stepped portions 8, 8 to the front and rear ends in the insertion direction, and a seal ring 10 at the front and an O-ring 11 at the rear are attached to these small diameter portions 9, 9. Furthermore, the frame body 6 is joined to each branch pipe 1c at each front surface of each of the front flanges 2b arranged on the same plane, and the respective rear flanges 2b arranged on the same plane are joined to each branch pipe 1c. are joined to the fuel pipe 4 at the rear faces of the frame body 6 and fastened thereto with bolts 12. In other words, the branch pipes 1c and the fuel pipe 4 are connected to the frame body 6.
They are fastened to each other through the . In this way, each nozzle 3 is supported by being sandwiched between the opposing surfaces of each branch pipe 1c and the fuel pipe 4 from the front and back via the front seal ring 10 and the rear O-ring 11. .

Next, to explain how to use it, first, the frame 6
The nozzle 3 is inserted into the front and rear insertion holes 5, 5 of each holder 2, and the seal ring 10 is inserted into the insertion hole 5 of the front flange 2b from the branch pipe 1c side.
to semi-fix the nozzle 3 to the frame 6. Similarly, the remaining three nozzles 3 are semi-fixed to the frame 6. Next, the O-ring 11 is inserted into the insertion hole 5 of each of the rear flanges 2b and fitted into the nozzle 3, and the fuel pipes 4 are inserted into the rear flanges 2b arranged on the same plane from behind. The bolts 12 are tightened and fixed to the frame 6 by the bolts 12. The thus obtained assembly is brought into contact with each of the branch pipes 1c at each front surface of each of the front flanges 2b arranged on the same plane, and the fuel injection port 3a of the nozzle 3 is inserted into the nozzle mounting hole 13.
Finally, the bolts 12 are tightened and fixed to each branch pipe 1c. In this way, an assembly in which the four nozzles 3 and the fuel pipes 4 are integrally assembled to the frame body 6 is prepared in advance, and each front surface of the front flange 2b is brought into contact with each of the branch pipes 1c. Since the bolts 12 are simply tightened to the branch pipes 1c, a large number of nozzles 3 can be easily and oil-tightly installed between the branch pipes 1c and the fuel pipes 4 at the same time.

The front surfaces of the front flanges 2b, which are the mounting surfaces for the engine components consisting of the branch pipes 1c, and the rear surfaces of the rear flanges 2b, which are the mounting surfaces for the fuel pipes 4, are precisely Although finishing processing is required, the flanges in front of each holder 2 are arranged so that their front surfaces are flush with each other, and the flanges 2b at the rear of each holder 2 are arranged so that their rear surfaces are flush with each other. Since they are arranged so that the front flanges 2b and the rear surfaces of the rear flanges 2b can be precisely finished by machining at the same time.

According to the present invention, the fuel nozzle 3
Each holder 2, which is formed into a U-shaped cross section in order to attach the fuel pipe 4 and the fuel pipe 4, is formed into an integral frame 6, and the front and rear flanges 2b, 2b are arranged so that the front and rear surfaces thereof are mutually connected. Since they are arranged on the same plane, the front flange 2b and the engine member 1
b and between the rear flange 2b and the fuel pipe 4 can be mounted face-to-face, so a large number of fuel nozzles 3 can be assembled in advance into the frame 6 and easily attached to engine components as an assembly. In addition, each fuel nozzle 3 can be easily installed through a nozzle insertion hole 5 formed in each flange 2b, 2b via a seal ring 10, 11 that fits into a step 8 formed in the nozzle 3. , 5, the fuel nozzle 3 can be easily inserted into the seal rings 10, 11 without any breakage or twisting, thereby preventing fuel leakage.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an example of the device of the present invention, FIG. 2 is a cross-sectional view taken along the line 2, FIG. 3 is an enlarged cross-sectional view of the main parts of the holder, and FIG. 4 is a front view of the holder. 1...Multi-cylinder engine, 1a...Cylinder, 1
b... Intake port (engine member), 1c... Branch pipe (engine member), 2... Holder, 2b...
Flange, 3... fuel nozzle, 4... fuel piping,
5...Insertion hole, 6...Frame body.

Claims (1)

[Claims] 1. On the outside of each engine member constituting the intake passage of each cylinder of a multi-cylinder engine, each fuel nozzle is connected to the fuel nozzle via each holder having a U-shaped cross section and having a side plate and flanges at the front and rear of the side plate. In a fuel nozzle mounting device in which continuous fuel pipes are provided, each of the holders is formed into an integral frame body, and the front and rear flanges are arranged so that the front and rear surfaces are on the same plane. At the same time, each of the fuel nozzles is fitted into a nozzle insertion hole formed in each of the flanges via a seal ring that fits into a step formed in the nozzle. .