JPS5951157A - Construction for mounting of fuel injection valve - Google Patents

Abstract

PURPOSE:To find any part not being fitted with sealing member easily and thereby have a sure check of the oil tightness, by forming a communication path at the contact part of a fuel piping member with the overstream ending part of a fuel injection valve and by fitting the sealing members at the contact part or in the neighborhood of its periphery. CONSTITUTION:A valve seat 3 is screwed fast to one of the sides of a cylindrical body 1, and an intermediate member 4 is arranged inside the other side. A fuel injection valve 20 is installed at an intake manifold 24 with the aid of seal rubber 15, and the intermediate member 4 is pressed by a fuel piping member 19 with an O-ring 21 interposed to be fitted fast to the internal-combustion engine. A communication path 17a is formed circumferentially. The air and oil tightnesses of the flange part 17 shall depend only upon said O-ring 21. If the sealing member is not fitted, it can be found easily by thus introducing the compressed air into the fuel passage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an internal combustion engine (iJ3 L in a shallow recess) equipped with a fuel injection device.
Regarding the structure of the fuel injection valve, in particular, the structure is such that the fuel injection valve is pressed by the combustion piping member at the downstream end of the valve and is attached to the internal combustion engine or the intake passage. Regarding the structure.

Conventionally, in this type of construction, the upstream end of the fuel injection valve and the downstream end of the fuel distribution member are pressed against each other, and an O-ring or the like is installed at the pressure contact or near its outer periphery. A seal member is provided. In addition, it is common that a filter is installed in the fuel passage and the flange is installed upstream of the fuel injector (for the J structure, the filter shape is 7 lunges). A convex step is formed on the end, and a sealing member such as an O-ring is placed on the outer periphery of the step.
It is connected to the M part of the fuel piping member and tied.

In this way, the oil tightness of the pumped fuel is ensured by the seal member, but how is the oil tightness 11? If the air pressure is to be checked, compressed air is burned).
It is common to use the 1f recognition method.

However, with this simple 417 approval method, it is easy to check for non-11ji, but on the other hand, if the fuel injection valve is
Airtightness occurs at the pressure contact part with the piping member, and there are cases where no pressure leakage can be confirmed even when the seal member is not installed. Especially when the flange part of the filter is interposed in the pressure contact part, in many cases, the filter (Since resin is used for the A quality, watertightness is also not guaranteed.

The present invention is based on the above-mentioned point ← In view of the above, C1 fuel N′+
111C1 Kawaben Dowari (J31 on which pressure contact part of the member to the amount T
Juru oil tight tIL mr R? To facilitate g, L'iJ function I: Replace the fuel injector.

In order to achieve this goal, the fuel nrx according to the invention
OJ dialect's tori 1) 1 mock 1 fixed 11 is decoration (O'': 1 jet q
・1 valve's flow part and 141 arrangement? 1t: Form a communication passage connecting the inner and outer peripheries of this L [contact part] in the pressure contact part with the part shrine, and install a sealing member near the outer periphery of the pressure contact part (31) to make it airtight. The structure relies only on the sealing member for durability and oil tightness.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view 71I showing an embodiment of the present invention.

In the figure, there is a stopper 2 on one side of the cylindrical body 1.
J＞Yohi The palfushi 1-3 is crimped and fixed via the kushigane protection part shrine 25, and inside the other side, a cylindrical relay member 4 with the fuel supply port on the right side is arranged coaxially with the body 1. There is a guard hole 5 formed at the tip of the valve seat 3, and a 4Li+ valve (3) is provided inside the valve seat 3.At the rear end of the valve seat 3 It is movable and connected to A 7, and the stroke of the backward speed lino is regulated by a stopper 8 integrally formed in the center thereof and the stopper 2. A screen 9 is fitted and fixed in the relay member 4. Furthermore, the spring 10 is compressed between the sleeve 9 and the movable core 7, and the spring 10 is pulled to open the valve 6 via the movable member 177.
One lap in the evening (LJ I(/'11) is wound and the knee is attached to the holder.
1 I neck 1 /l is tied and 1 C
a3, through the end A13 knee+Ile '11
An electric signal for excitation is supplied to the

It takes! 1 valve 20 is connected to the 1C index manifold 24 through the seal rubber 15 (=I C:, I is connected to the upstream end of the fuel injection valve 20). The flange portion 17J of the filter 1G is filled with 4R'l fat, etc., and surrounds the outer circumferential wall of the flange portion 17. It is installed in an internal combustion engine by being pushed into a fuel piping member 19 extending to the right of the fuel passage 18 via an O-ring 21 which is a sealing member installed in a similar manner. Flange portion 17 of filter 16
For example, two communication passages 17a are formed in the direction of the circumference fj in the direction of the circumference fj. According to this, even if a pushing force 11 in the direction of the fuel piping member 19 is applied to the fuel injection valve 20 due to the elastic force of the seal rubber 15, airtightness will not occur in the flange portion a3, and airtightness will not occur. In this case, the seal structure relies only on the O-ring 21 for oil tightness. The J3, O ring 21 can maintain the above-mentioned sealing structure no matter where it is installed between the outer circumferential wall of the upstream end of the fuel injection DJ valve 20 and the holder 23.

FIG. 2 is a sectional view showing another embodiment of the present invention, in which parts equivalent to those in FIG. 1 are designated by the same reference numerals. In this embodiment, an O-ring 2 is further provided at the pressure contact portion between the upstream end of the fuel stone injection valve 20 and one fuel piping member.
A collar 22 is provided as a holding member which is arranged so as to surround the outer circumference of the ring 1 and which holds the O-ring 21 therein. In order to prevent airtightness from occurring in the collar 22 even if the pressing force of the fuel piping member 19 acts on the fuel injector 20, a groove 1 is formed on the end surface of the collar 22, which communicates the inner peripheral wall and the outer peripheral wall of the collar 22. In other words, two communication passages 22a are formed in the circumferential direction, and the O-ring 2 is used to ensure airtightness and oiltightness.
The seal structure relies only on 1.

FIG. 3 is a sectional view showing still another embodiment of the present invention, in which the same parts as in FIG. 1 are designated by the same reference numerals. The flange portion 17 is connected to the upstream end of the fuel injection valve 20, and the fourth portion 4 is formed at the fuel supply side end of the relay portion +J4.
a, and the end on the fuel supply port side is in pressure contact with the west combustion 111 distribution member 19, roughly near the outer periphery of the pressure contact part.
holder 23 on the outer peripheral wall of the fuel IB inlet side end.
(1!i) An O-ring 21 is provided between the 41 and the 41-distribution part shrine 19 (-C). Even if the pressure J of the fuel filtration member 19 acts on the fuel injection valve 20, the upstream end of the fuel injection valve 20 and the fuel piping member 19
In order to prevent airtightness from occurring at the pressure contact part J3 with the filter 1G, the flange part 17j3 of the filter 1G is provided with a relay member 40, and the end face is provided with the groove connecting the inner circumference and the outer circumference of the contact part. J3 in the circumferential direction through the communication passages 17aJ3 and 4b, respectively.
At least one tree is formed, and airtightness and oiltightness depend only on the O-ring 21, making it a TC seal structure.

J3. In each of the above embodiments, the grooves formed in the end faces of each member were used as communication passages, but the communication passages may also be through holes passing through the walls of each member.

As shown in L below, according to the present invention, a communication path is formed in the pressure contact portion between the upstream end of the fuel Q4 valve and the fuel piping member, which communicates the inner peripheral portion and the outer peripheral portion of the pressure contact portion, The seal part is attached to the pressure welding part or near its outer periphery, and the airtightness and oiltightness depend only on the sealing member, making it an LC structure, so even if you forget to incorporate the sealing member, compressed air can still be supplied. A simple RJF introduced into the fuel passage [approval law makes it possible to reliably detect if a seal member is not installed, making it easier to confirm oil tightness.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing embodiments of the present invention, Fig. 2 is a cross-sectional view showing another embodiment of the present invention, and Fig. 3 is a J cross-sectional view showing still another embodiment of the present invention. be. Explanation of symbols of main parts 1...Body 4...Relay member 4a...Communication passage 5...Fuel injection hole 6...Sword Valve 7...Movable core 11...Coil 14...Connector 15...Seal rubber 1G...Filter 17... Flange portion 17a... Communication passage 19... Fuel piping member 20... Fuel injection valve 21... O-ring 22... Collar 22a. ...Connection applicant: Honda Motor Co., Ltd. agent Patent attorney: Motohiko Fujimura

Claims (1)

[Scope of Claims] (1) A fuel injection valve that supplies fuel to the internal combustion engine during combustion is pressed by a fuel piping member at the upstream end of the fuel injection valve, while the engine or intake passage is pressed. 1) structure of the fuel injector with a pull configuration,
A communication path is formed in the upstream end of the Shokawa valve and the pressure contact part of the above-mentioned fuel ≧ 1 arrangement part, and a communication path is formed to communicate the inner peripheral part and the outer peripheral part of the pressure contact part, and the pressure contact part or the vicinity of the outer peripheral part is formed. A flange part of a filter disposed in the fuel injection valve 1 passage of the fuel injection valve is attached to the pressure contact part. The flange portion is provided with a communication path that communicates between the inner circumferential wall and the outer circumferential wall of the flange portion.
Fuel injection structure described in Section t) J-valve removal. (3) Wit I: “The contact portion roughly includes the seal member provided so as to surround the outer peripheral wall of the flange portion of the filter and the seal retainer provided so as to surround the outer periphery of the seal member. 13. The mounting structure for a fuel injection valve according to claim 12, characterized in that a communicating passage is formed in the seal holding member to communicate the inner circumferential wall and the outer circumferential wall of the seal holding member.