JPS6147976B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting device for a fuel injection type fuel nozzle in an engine.

Conventionally, as this type of device, a type is known in which a fuel nozzle is provided outside the cylinder head, intake manifold, or other parts of the engine via a holder, and a fuel pipe connected to the nozzle is provided outside the nozzle. The nozzle self-vibrates due to the intermittent injection of fuel, and it is preferable to prevent this from being transmitted to the outside, and it is also preferable that there is no heat transfer from the outside and that good sealing properties can be obtained at the front and rear connections. .

The object of the present invention is to obtain a device that meets such requirements, in which a fuel nozzle and a fuel pipe connected to the fuel nozzle are provided on the outside of an engine member via a holder. the holder is fastened to the engine member;
Formed into a U-shaped member having a front flange opening a front insertion hole connected to the engine member, and a rear flange opening a rear insertion hole tightly connected to the fuel pipe and connected to the fuel pipe. Further, the small diameter portion of the tip of the fuel nozzle is fitted into the front insertion hole of the holder via a seal ring, and the small diameter portion of the rear end of the fuel nozzle is inserted into the rear insertion hole of the holder via an O-ring. The fuel nozzle is sandwiched from the front and back between the opposing surfaces of the engine member and the fuel pipe by fitting and connecting the engine member and the fuel pipe of the holder. .

Embodiments of the present invention will be described with reference to attached drawings.

In the drawings, reference numeral 1 designates an engine member, which is provided with a fuel nozzle 3 on the outside thereof through a holder 2, and a fuel pipe 4 that communicates with this on the outside. The engine member 1 consists of a cylinder head 1a at the top of the engine or an intake manifold 1b extending from the cylinder head 1a, and in the illustrated one, the manifold 1b is branched into four parts as shown in FIG. 1, and each one is connected to the engine. A fuel nozzle 3 and a fuel pipe 4 are provided on the outside of the fuel nozzle 3 via the holder 2 as described above. In this case, the fuel nozzles 3 are arranged in four pieces in the horizontal direction as clearly shown in the figure, and each fuel pipe 4 is one continuous common pipe as clearly shown in the figure. Further, each holder 2 is also substantially the same, and as clearly shown in FIG. 3, they are formed integrally and continuously.

The holder 2 has a U-shape with front and rear flanges 5a, 5b, as shown in FIG. Further, the nozzle 3 has stepped portions 7a and 7b at the front and rear ends, and has small diameter portions 8a and 8b, into which the front seal ring 9 and the rear O-ring 10 are fitted. Further, the holder 2 is superimposed on the opposing surfaces of the engine member 1 and the fuel pipe 4 at the front and rear flanges 5a and 5b, and each screw 1 is attached to this.
1 and 11. In other words, the member 1 and the piping 4 are tightly connected to each other via the holder 2. Thus, the fuel nozzle 3 has the front seal ring 9 and the rear O-ring 10.
The member 1 and the pipe 4 are sandwiched and supported from the front and back between opposing surfaces thereof. In other words, the seal ring 9 is inserted between the fuel nozzle 3 and the engine member 1 in a compressed state in the longitudinal direction, and the O-ring 10 is inserted between the fuel nozzle 3 and the piping 4. It is now possible to intervene in a compressed state in the front-back direction.

To explain further, the outer diameter of the seal ring 9 is increased by the compression and is press-fitted into the insertion hole 6a on the outer periphery. It was configured to be supported from the outer periphery within the insertion hole 6a through the insertion hole 6a. The seal ring 9 has a relief part 15 formed in advance on its outer periphery so as not to produce an excessive bulge when the outer diameter increases due to the compression, and a lower plate 12 is superimposed on the back surface of the seal ring 9.

Even though the outer diameter of the O-ring 10 is increased due to the compression, there is some gap between it and the insertion hole 6b on the outer periphery.If this is fitted, the rear small diameter portion 8b will fit inside the hole 6b. Furthermore, the fuel nozzle 3 is designed to have some clearance around its outer periphery even in the large diameter section in front of the small diameter section 8b. The rear small-diameter portion 8b is made of a pipe member extending rearward, the tip of which is fitted into the internal fuel passage 3a that opens at the tail end of the large-diameter portion. FIG. 6 shows a modification thereof, in which the holder 2 is made of a heat insulating material and the fuel nozzle 3 is
The rear insertion hole 6
A metal collar 13 is fitted inside b to mechanically reinforce it, and the pipe member forming the rear small diameter portion 8b is integrally provided with a filter 14 extending forward.

According to the present invention, the holder 2 for attaching the fuel nozzle 3 and the fuel pipe 4 connected to the fuel nozzle 3 on the outside of the engine member 1 is fastened to the engine member 1, and the holder 2 is fastened to the engine member 1. 1
The front flange 5a that opens the front insertion hole 6a connected to the fuel pipe 4 is fastened to the fuel pipe 4.
The small diameter portion 8a at the tip of the fuel nozzle 3 is formed into a U-shaped member having a rear flange 5b opening a rear insertion hole 6b connected to the holder 2, and a small diameter portion 8a at the tip of the fuel nozzle 3 is inserted into the front insertion hole 6a of the holder 2 via a seal ring 9. The small diameter portion 8 at the rear end of the fuel nozzle 3 is inserted through the O-ring 10 into the rear insertion hole 6b of the holder 2.
b into the engine member 1 of the holder 2.
The fuel nozzle 3 is sandwiched between the opposing surfaces of the engine member 1 and the fuel pipe from the front and back by fastening with the fuel pipe 4 and the fuel nozzle 3 is inserted into the holder 2 from the front and back. By being fitted into the holes 6a and 6b, both rings 9 and 10 can provide good anti-vibration properties, heat insulation properties, and sealing properties in the front and rear, and furthermore, the fuel nozzle 3 is inserted into the holder 2 in advance and prepared. It is sufficient to tighten the engine member 1 and the fuel pipe 4 in the holder 2, and this makes the installation work simpler and easier than when the engine member and the fuel pipe are fitted into insertion holes provided in the holder 2. It has the effect of

[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 - Fig. 3 is a front view of the holder,
FIG. 4 is an enlarged cross-sectional side view of the main part, FIG. 5 is a cross-sectional view of the seal ring, and FIG. 6 is a cross-sectional side view of a modified example of the main part. 1... Engine member, 2... Holder, 3... Fuel nozzle, 4... Fuel piping, 6, 6... Insertion hole,
7, 7...Step part, 8, 8...Small diameter part, 9...Seal ring, 10...O ring, 11, 11...Screw.

Claims (1)

[Claims] 1. In a device in which a fuel nozzle and a fuel pipe connected to the fuel nozzle are provided on the outside of the engine member via a holder, the holder is attached to the front part that is tightly connected to the engine member and connected to the engine member. The holder is formed into a U-shaped member having a front flange that opens an insertion hole, and a rear flange that opens a rear insertion hole that is fastened to the fuel pipe and is connected to the fuel pipe. The small diameter part of the tip of the fuel nozzle is inserted into the front insertion hole through a seal ring, and the O is inserted into the rear insertion hole of the holder.
A small diameter portion at the rear end of the fuel nozzle is fitted through a ring, and the engine member and the fuel pipe of the holder are fastened together to connect the fuel nozzle to the surface facing the engine member and the fuel pipe. A fuel nozzle mounting device characterized by being sandwiched between the front and back.