Fluid sprinkling – spraying – and diffusing – Unitary injection nozzle and pump or accumulator plunger
Patent
1998-11-19
2000-10-31
Morris, Lesley D.
Fluid sprinkling, spraying, and diffusing
Unitary injection nozzle and pump or accumulator plunger
239 93, 239 95, 239 96, 23953311, 18832216, 277447, F02M 4702
Patent
active
061389234
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an injector in which a boosting piston may intensify fuel supplied in an intensified chamber through a common fuel supply rail.
BACKGROUND ART
The conventional hydraulically-actuated, electronically-controlled fuel injection apparatus is disclosed in, for example, Published Japanese translations of PCT international publication No. 511527/1994. The injector used in the prior fuel injection apparatus has the structure, for example, shown in FIG. 13, which may control in a variable manner the fuel flow characteristics of the hydraulically-actuated injector in the fuel injection stroke of the engine and make possible the quick starting of the engine.
Referring to FIG. 13, the prior injector 1 has comprised of a main body having a central passage and fuel injection holes 13, and a casing 6 arranged so as to form an annular clearance for a fuel chamber 20 around the main body. The main body of the injector 1 comprises a nozzle body 2 formed with a central passage 49 and injection holes 13, a fuel supply body, or plunger barrel 5 forming an intensified chamber 7, a spacer body 81 and an annular spacer body 21 arranged between the nozzle body 2 and fuel supply body 5, the annular spacer body being provided therein with a bore 29, an injector body 4 provided with a pressure chamber 8 supplied with hydraulically actuating fluid, and a solenoid body 3 having therein a solenoid valve 16, the solenoid body being provided with a leak line of a draining groove 39 and a draining passage 38. The casing 6 surrounds all of the nozzle body 2, spacer body 81, annular spacer body 21 and fuel supply body 5 so as to provide the fuel chamber 20 between them and itself, the casing 6 being further secured to the injector body 4 to thereby keep the bodies in integration. The casing 6 is engaged in a fluid-tight manner at its one end with a stepped abutment 14 of the nozzle body 2 and also sealed at its other end against the injector body 4 by screw-fitting at a threaded face 80 thereof. The casing 6 has fuel inlet 11 and fuel outlet 12, both of which open to a common fluid supply rail 51 from which the fuel is constantly applied to the fuel chamber 20.
The injector 1 comprises an intensified chamber 7 provided in the fuel supply body 5 for intensifying the fuel fed from the fuel chamber 20, a fuel pass 22 formed through the spacer body 81, annular spacer body 21 and nozzle body 2 to supply the fuel from the intensified chamber 7 to the injection holes 13. The injection 1 further includes a needle valve 23 held for sliding movement in the central passage 46 in the nozzle body 2 so as to open the injection holes 13 by the action of the fuel pressure, a boosting piston 109 for applying pressure to the fuel in the intensified chamber 7, the pressure chamber 8 being supplied with hydraulically actuated fluid for applying the high pressure to the axial end of the boosting piston 109, and the solenoid actuated control valve 16 controlling the supply of the hydraulically actuated fluid into the pressure chamber 8.
Arranged in the bore 29 in the annular spacer body 29 is a return spring 18 to forcibly urge the needle valve 23 towards a closed position where the injection holes 13 are closed. The return spring 18 is abutted at its one end against the top of the needle valve 23 and at its the other end against the spacer body 81. The injector body 4 is provided therein with a concave 26 larger in diameter for forming a spring chamber 30 defined between opposing end faces of the fuel supply body 5 and an enlarged diameter portion 115 of a boosting piston 109. The spring chamber 30 contains therein a return spring 17 to forcibly urge the boosting piston 109 towards the pressure chamber 8. Arranged in a hollow 85 in the injector body 4 is a return spring 19 to normally bias the solenoid valve 16 towards a position where the flow of the hydraulically actuating fluid is shut off. The spring chamber 30 having the boosting piston 109 therein communicates with the fuel chamber 20 through a passagewa
REFERENCES:
patent: 2967745 (1961-01-01), Stevens
patent: 3939872 (1976-02-01), Wentworth, Jr.
patent: 4381077 (1983-04-01), Tsumura et al.
patent: 5423484 (1995-06-01), Zuo
patent: 5652381 (1997-07-01), Fuchs
patent: 5743234 (1998-04-01), Nemoto et al.
patent: 5992768 (1999-11-01), Beatty
Nakano Futoshi
Uchiyama Tadashi
Evans Robin O.
Isuzu Motors Limited
Morris Lesley D.
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