JPH0245655A - Fuel injector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention injects fuel adjacent to the inlet boat of an engine by means of a plurality of injection nozzles, and a single fuel injection injector injects fuel to all injection nozzles. The present invention relates to a fuel injection device for a multi-cylinder internal combustion engine that regulates fuel.

[Prior Art and Problems Therewith] Japanese Patent Application Laid-Open No. 1758/1983 filed by the present applicant discloses a fuel injection device having a single central fuel injector that regulates fuel to a plurality of injection nozzles. has been done. In this conventional fuel injection device, each injection nozzle is connected to a central fuel injector via a narrow injection tube. Therefore, there has been a problem in that connecting and holding the injection pipe to the fuel injector is somewhat troublesome.

[Object of the invention] The object of the invention is to provide a fuel injection device which ensures that the injection tube can be easily connected to the central fuel injector and easily retained by the fuel injector. .

[Structure of the Invention] That is, the device according to the present invention is a fuel injection device having a plurality of radially oriented grooves at the base thereof, each receiving an end of an injection tube, an O-ring surrounding each injection tube to seal the injection tube within the groove for receiving the injection tube, and an O-ring surrounding each injection tube to support the injection tube within the groove; characterized by comprising a sleeve and a retaining clip secured to the base, surrounding the injection tube and having spring fingers for biasing the sleeve to retain the injection tube in a corresponding groove. .

In a construction according to the invention, the base of the central fuel injector has a plurality of radially oriented grooves for receiving the ends of the injection tubes, each end of the injection tube being flared; An O-ring surrounds the groove and seals the injection tube within the groove, a plastic sleeve surrounds each injection tube supporting the injection tube within the groove, and a retainer clip or A retaining clip is secured, the retaining clip having spring fingers that surround the injection tube and bias the plastic sleeve to retain the end of the injection tube within the mesh groove.

[Operations and Effects of the Invention] The structure of the device according to the present invention is as described above, and the O-ring and sleeve are set around the end of the injection tube and inserted into the groove, and the retaining clip is attached to the base. If fixed,
The spring fingers of the clip bias the sleeve on the end of the injection tube towards the interior of the groove, thereby allowing the setting of the injection tube and thus achieving the intended purpose described above. I can do it.

[Example] First, referring to FIGS. 1 and 2, the fuel injection device 1
0 is received within the body 11 and has a cylindrical base 12 which is threaded into the upper part 14.

The upper portion 14 has a cylindrical filter element 16 surrounding the fuel inlet area and a solenoid operated valve element 17 located above a plurality of fuel exhaust passages 18 provided in the cylindrical base 12. Each fuel discharge passage 18 communicates via a (radially oriented) supply passage 20 to a (radially open) groove 22 that receives an injection tube 24 .

The end 26 of each injection tube 24 is flared and has a stepped shoulder 2 at the junction of the groove 22 and the supply passageway 20.
8 and is accommodated in the groove 22. Each injection tube 24 is
- enclosing and sealing the injection tube 24 in the groove 22 with a ring 30; Furthermore, each injection tube 24 is wrapped in a plastic sleeve 3.
2 to support the injection tube 24 within the groove 22.

The retaining clip 34 has a base portion 3 [3a located below the bottom 38 of the cylindrical base 12 and a cylindrical portion 36b that is divided to form a spring finger 40 surrounding the injection tube 24.
and has. When the retaining clip 34 is placed on the cylindrical base 12 , the curled upper end (free end) 42 of each spring finger 40 flexes outwardly, causing the plastic sleeve 32 to flex outwardly.
is guided onto the rounded end 44 of.

As a result, the spring fingers 40 bias the plastic sleeve 32 and therefore the injection tube 24 to retain the end 26 of the injection tube 24 within the groove 22. Therefore, the rounded end 44 of the plastic sleeve 32 is connected to the cylindrical base 12.
assists in retaining the retaining clip 34 on the top.

With such a configuration, the injection pipe 24 is connected to the fuel injection device 10.
can be easily connected to the injection pipe 24 by the fuel injection device 10.
to ensure that it can be easily held.

An air inlet adapter 46 secured to the bottom 38 of the cylindrical base 12 by bolts 48 also assists in retaining the retaining clip 34 on the cylindrical base 12. Air inlet adapter 46 has an inlet tube 50 that directs fresh air into air inlet passageway 52 . Air inlet passage 52 opens through a bottom wall 54 of a rectification valve chamber 56 defined between cylindrical base 12 and air inlet adapter 46 . The air outlet passage 58 is connected to the rectification valve chamber 56
It opens through the top wall 60 and leads to a plurality of air exhaust passages 62 , each extending radially and opening into a corresponding one of the supply passages 20 .

A rectification valve disk 64 located within the rectification valve chamber 56 has a flat valve surface 66 adjacent the air population passageway 52 and an irregular surface 68 adjacent the air outlet passageway 58 .

When solenoid-operated valve element 17 is opened to condition fuel through fuel exhaust passage 18 , the pressure in supply passage 20 , air exhaust passage 62 , and air outlet passage 58 increases and the rectification valve around air inlet passage 52 increases. The bristled valve surface 66 of the disc 64 engages the bottom wall 54 of the rectification valve chamber 56 to seal the air inlet passageway 52. When the solenoid-operated valve element 17 is closed, the pressure in the supply passage 20, air exhaust passage 62, and air outlet passage 58 is reduced to lift the rectifying valve disc 64. Irregular surfaces 68 of rectifying valve disc 64 engage earthen walls 60 around air outlet passage 58 and air inlet passage 5
2. Allow air to flow through the rectification valve chamber 56, the air outlet passage 58, and the air exhaust passage 62, and discharge the air to the supply passage 20.

More detailed structure and operation of the fuel injection device 10 are described in the above-mentioned Japanese Patent Application Laid-Open No. 63-1758, and other details are described in U.S. Pat. No. 4,572,436. Such detailed structure and operation will not be described in this specification.

Referring now to FIGS. 3 and 4, fuel injection system 110 has a plurality of (radially oriented) grooves 122 that receive injection tubes 124 (radially oriented).
It has a cylindrical base 112 with a supply passage 120.

The end 126 of each injection tube 124 is widened, and the groove 12
An O-ring 130 is received in the groove 122 against a shoulder 128 at the connection between the injection tube 124 and the supply passageway 120 and surrounds each injection tube 124, sealing the injection tube 124 in the groove 122 and further sealing the injection tube 124 in the groove 122. A plastic sleeve 132 surrounding the tube 124 supports the injection tube 124 within the groove 122. In this embodiment, each plastic sleeve 132 has a shoulder 13 that engages a complementary shoulder 133b of the groove 122.
It has 3a.

The retaining clip 134 has a base portion 136a located below the bottom 136 of the cylindrical base 112 of the injector or fuel injection device, and a cylindrical portion 136b that is divided to define a spring finger 140 surrounding the injection tube 124. has. When the retaining clip 134 is placed onto the cylindrical base 112 , the curled upper end 142 of each spring finger 140 is deflected outwardly and guided onto the rounded end 144 of the plastic sleeve 132 .

For this reason, the spring fingers 140 are attached to the plastic sleeve 13.
2 to retain the end 126 of the injection tube 124 within the corresponding groove 122.

The lower ends of the base portion 136a and the cylindrical portion 136b are divided into flexible tabs 145 by slits 147. Each flexible tab 145 has an inwardly directed ridge 1
49, which ridges engage within a group 151 circumferentially surrounding the cylindrical base 112 to secure the retaining clip 134 to the cylindrical base 112.

With such a configuration, the injection pipe 124 is connected to the fuel injection device 1.
10 and ensures that the injection tube 124 can be easily held by the fuel injection device 110.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a fuel injection device according to a first embodiment of the present invention, showing the engagement between a retaining clip and a plastic sleeve for an injection tube; FIG. 2 is a partial sectional view of a retaining clip and a plastic sleeve for an injection tube; FIG. 1 is a sectional view of the lower portion of the fuel injection device of FIG. 1 taken along line 2-2 of FIG. FIG. 3 shows the air inlet adapter of FIG. 1 as a cross-sectional view along IB-IB;
FIG. 4 is a partial cross-sectional view of a fuel injection device according to a second embodiment of the invention, showing the engagement of the retaining clip with the plastic sleeve for the injection tube; FIG. FIG. 3 is a perspective view showing details of the clip. Explanation of symbols 10, 110...Fuel injection device 12, 112...Cylindrical base 20.120...
Supply passage 22, 122... Groove 24.12
4... Injection tube 26, 126... End of injection tube 28
．． 128...Yong part 30, 130...0-ring
32.132...Sleeve 34, 134...Retaining clip 36a, 136a...Base part seb, 1
3eb...Cylindrical part 40.140...Spring fingers 42, 142...Free ends of spring fingers 44, 144...End of sleeve 145...Tab 147...Slit 149 ...Protuberance 151...Group (4 people outside)

Claims (1)

Claims: 1. A fuel injection device (10) having a base (12, 112) with a plurality of radially oriented grooves (22, 122) each receiving an end of an injection tube (24, 124). , 11
0), the ends of each of the injection tubes are widened; O-rings (30, 130) surrounding each of the injection tubes to seal the injection tubes within the grooves; a sleeve (32, 132) surrounding each injection tube to support the injection tube;
and a retaining clip (34, 34, fixed to the base) having spring fingers (40, 140) surrounding the injection tube and biasing the sleeve to retain the injection tube in the corresponding groove. 134) A fuel injection device comprising: 2. The fuel injection device according to claim 1, having a plurality of radially oriented supply passages (20, 120) open to the groove, and an end portion (
26, 126) engages a shoulder (28, 128) at the connection between said groove and said supply passage. 3. A fuel injection device according to claim 1 or 2, wherein the free end (42, 142) of the spring finger guides the free end onto the end (44, 144) of the sleeve. The fuel injection device is characterized in that the end of the sleeve is rounded to assist in retaining the retaining clip on the base. 4. The fuel injection device according to any one of claims 1 to 3, wherein the holding clip includes a base portion (36a, 136a) and a cylindrical portion (36b).
, 136b), wherein the spring finger extends from the cylindrical portion and the base portion engages the base portion. 5. In the fuel injection device according to claim 4, the base portion (136a) has a slit (147).
an inwardly directed ridge for said cylindrical portion (136b) to engage a corresponding group (151) in said base (112); (149) A fuel injection device characterized by having: (149). 6. A retaining clip (34
, 134).