EP0196265A2
Expired / Lapsed
EP
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Modular accumulator injector
Assignee: Stanadyne LLC
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Filing: 1986-03-06
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Granted: —
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Expires: 2006-03-06
Abstract
Abstract An accumulator injector for injecting discrete pressurized charges offuel has a modular-type configuration. An auxiliary accumulator pressure chamber (70) in the form of a cap (58) is threadably mounted to a main body member (12). A solenoid valve means (20) for selectively releasing pressure from a control chamber (54) to thereby trigger the injection of pressurized fuel is also removably mounted to the main body member (12).
Inventors
- 👤 Ilija Djordjevic
- 👤 Marco Ganser
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 15:54
CPC Classifications
F; F02; F02M; F02M47/00; F02M47/02; F02M47/027
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
232 words
An accumulator injector for a fuel injection system comprising : valve body means forming a control chamber, a bleed passage from said control chamber, and an accumulator passage to receive fuel at rail pressure and transfer said fuel to said control chamber and said accumulator passage; nozzle means mounted to said valve body means to receive pressurized fuel from said accumulator passage and to inject pressurized fuel, said nozzle means comprising a discharge orifice means, a valve seat and an elongated valve needle engageable with said valve seat in response to pressure in said control chamber to prevent the passage of pressurized fuel through said discharge orifice means and momentarily axially displaceable from said seat for injecting pressurized fuel through said discharge orifice means; auxiliary accumulator chamber means removably mounted to said valve body means and communicating withsaid accumulator passage and said nozzle means to accumulate pressurized fuel; adaptor means removably mounted to said valve body means to form a receiving cavity and a fuel return means communicatable with said bleed passage;and solenoid valve means received in said receiving cavity to selectively vent said bleed passage for communication with said fuel return passage so that energization of said solenoid valve means causes a release of pressure from said control chamber and the momentary axial displacement of said valve needle to inject a discrete charge of pressurized fuel through said discharge orifice means.
Claim 2
Dependent Claim
232 words
An accumulator injector for a fuel injection system comprising : valve body means forming a control chamber, a bleed passage from said control chamber, and an accumulator passage to receive fuel at rail pressure and transfer said fuel to said control chamber and said accumulator passage; nozzle means mounted to said valve body means to receive pressurized fuel from said accumulator passage and to inject pressurized fuel, said nozzle means comprising a discharge orifice means, a valve seat and an elongated valve needle engageable with said valve seat in response to pressure in said control chamber to prevent the passage of pressurized fuel through said discharge orifice means and momentarily axially displaceable from said seat for injecting pressurized fuel through said discharge orifice means; auxiliary accumulator chamber means removably mounted to said valve body means and communicating withsaid accumulator passage and said nozzle means to accumulate pressurized fuel; adaptor means removably mounted to said valve body means to form a receiving cavity and a fuel return means communicatable with said bleed passage;and solenoid valve means received in said receiving cavity to selectively vent said bleed passage for communication with said fuel return passage so that energization of said solenoid valve means causes a release of pressure from said control chamber and the momentary axial displacement of said valve needle to inject a discrete charge of pressurized fuel through said discharge orifice means.
Claim 3
Dependent Claim
31 words
The accumulator injector of claim 1 wherein said auxiliary accumulator chamber means and said solenoid valve means are generally disposed at right angles to the displacement axis of said valve needle.
Claim 4
Dependent Claim
56 words
The accumulator injector of claim 1 wherein said solenoid valve means comprises a solenoid including a coil and an armature, and a pilot valve governed by said armature, said armature being normally spring biased to a first position and being retractable to a second position upon energization of said coil, said retracting distance defining a gap.
Claim 5
Dependent Claim
30 words
The accumulator injector of claim 3 further comprising a shim positionable against said adaptor means wherein the dimensions of the shim at least partially define the dimensions of said gap.
Claim 6
Dependent Claim
25 words
The accumulator injector of claim 1 wherein said auxiliary accumulator chamber means comprises a generally cylindrically shaped cap threadably mounted to said valve body means.
Claim 7
Dependent Claim
38 words
The accumulator injector of claim 1 further comprising an inlet insert received by said valve body means, said inlet insert forming an inlet passage leading to said control chamber, an inlet orifice being interposed in said inlet passage.
Claim 8
Dependent Claim
78 words
The accumulator injector of claim 6 further comprising an outlet insert member d Lsposed between said valve body means and said adaptor means, said outlet insert forming a seal with said valve body means along a generally frusto-conical surface and forming a second bleed passage communicating with said first bleed passage, a bleed orifice being disposed in said second bleed passage, the diameter of said bleed orifice being dimensioned in accordance with the diameter of the inlet orifice.
Claim 9
Dependent Claim
197 words
An accumulator injector for a fuel injection system comprising: valve body means forming a control chamber, a bleed passage from said control chamber, and an accumulator passage to receive fuel at-rail pressure and transfer said fuel to said control chamber and said accumulator passage; nozzle means mounted to said valve body means to receive pressurized fuel from said accumulator passage and to inject pressurized fuel, said nozzle means comprising an orifice discharge means, a valve seat and an elongated valve needle engageable with said valve seat in response to pressure in said control chamber to prevent the passage of pressurized fuel through said discharge orifice means and momentarily axially displaceable from said valve seat for injecting pressurized fuel through said discharge orifice means; auxiliary accumulator chamber means removably mounted to said valve body means and communicating with said accumulator passage and said nozzle means to accumulate pressurized fuel; and solenoid valve means to selectively vent said bleed passage so that energization of said solenoid valve means causes a release of pressure from said control chamber and the momentary axial displacement of said valve needle to inject a discrete charge of pressurized fuel through said discharge orifice means.
Claim 10
Dependent Claim
197 words
An accumulator injector for a fuel injection system comprising: valve body means forming a control chamber, a bleed passage from said control chamber, and an accumulator passage to receive fuel at-rail pressure and transfer said fuel to said control chamber and said accumulator passage; nozzle means mounted to said valve body means to receive pressurized fuel from said accumulator passage and to inject pressurized fuel, said nozzle means comprising an orifice discharge means, a valve seat and an elongated valve needle engageable with said valve seat in response to pressure in said control chamber to prevent the passage of pressurized fuel through said discharge orifice means and momentarily axially displaceable from said valve seat for injecting pressurized fuel through said discharge orifice means; auxiliary accumulator chamber means removably mounted to said valve body means and communicating with said accumulator passage and said nozzle means to accumulate pressurized fuel; and solenoid valve means to selectively vent said bleed passage so that energization of said solenoid valve means causes a release of pressure from said control chamber and the momentary axial displacement of said valve needle to inject a discrete charge of pressurized fuel through said discharge orifice means.
Claim 11
Dependent Claim
26 words
The accumulator injector of claim 8 wherein said auxiliary accumulator chamber means comprises a cap member which is threaded for mounting to said valve body means.
Claim 12
Dependent Claim
187 words
An accumulator injector for a fuel injection system comprising : valve body means forming a control chamber, a bleed passage from said control chamber, and an accumulator passage to receive fuel at rail pressure and transfer said fuel to said control chamber and said accumulator passage; nozzle means mounted to said valve body means to receive pressurized fuel from said accumulator passage and to inject pressurized fuel, said nozzle means comprising a discharge orifice means, a valve seat and an elongated valve needle engageable with said valve seat in response to pressure in said control chamber to prevent the passage of fuel through said discharge orifice means and momentarily axially displaceable from said seat for injecting pressurized fuel through said discharge orifice means ; solenoid valve means to selectively vent said bleed passage so that energization of said solenoid valve means causes a release of pressure in said control chamber and the momentary axial displacement of said valve needle to inject a discrete charge of pressurized fuel through said discharge orifice means; and mounting means to removably mount said solenoid valve means to said valve body means.
Claim 13
Dependent Claim
187 words
An accumulator injector for a fuel injection system comprising : valve body means forming a control chamber, a bleed passage from said control chamber, and an accumulator passage to receive fuel at rail pressure and transfer said fuel to said control chamber and said accumulator passage; nozzle means mounted to said valve body means to receive pressurized fuel from said accumulator passage and to inject pressurized fuel, said nozzle means comprising a discharge orifice means, a valve seat and an elongated valve needle engageable with said valve seat in response to pressure in said control chamber to prevent the passage of fuel through said discharge orifice means and momentarily axially displaceable from said seat for injecting pressurized fuel through said discharge orifice means ; solenoid valve means to selectively vent said bleed passage so that energization of said solenoid valve means causes a release of pressure in said control chamber and the momentary axial displacement of said valve needle to inject a discrete charge of pressurized fuel through said discharge orifice means; and mounting means to removably mount said solenoid valve means to said valve body means.
Claim 14
Dependent Claim
25 words
The accumulator injector of claim 10 wherein said mounting means further comprises an adaptor sleeve forming a receiving cavity for receiving said solenoid valve means.
Claim 15
Dependent Claim
52 words
The accumulator injector of claim 11 wherein said adaptor sleeve further defines a second bleed passage interposed by a bleed orifice and said solenoid valve means includes a pilot valve which is sealingly engageable at said orifice to selectively close the orifice to the passage of fuel from said second bleed passage.
Claim 16
Dependent Claim
59 words
The accumulator injector of claim 11 wherein the solenoid valve means further comprises a solenoid body and an armature axially displaceable relative to said body with the position of said pilot valve being governed by the armature and wherein the energization of said solenoid valve means retracts the pilot valve to a second position displaced from said discharge orifice.
Claim 17
Dependent Claim
41 words
The accumulator injector of claim 13 wherein the pilot valve further comprises an axial return passage which selectively communicates with the second bleed passage so that fuel released from said second bleed passage passes between the armature and the solenoid body.
Claim 18
Dependent Claim
39 words
The accumulator injector of claim 13 wherein the distance between the first position and the second position of said pilot valve is at least partially defined by means of a shim engageable against the end of the adaptor sleeve.
Claim 19
Dependent Claim
43 words
The accumulator injector of claim 1 wherein the control chamber is defined by a plug member threaded into a bore in said valve body means, and the maximum displacement of said valve needle is defined by the axial position of said plug member.
Claim 20
Dependent Claim
40 words
The accumulator injector of claim 1 wherein said valve needle has a control portion which is received in said control chamber , said control portion forming an axial bore, a radial passage, and an annulus communicating with said bleed passage.
Claim 21
Dependent Claim
37 words
The accumulator injector of claim 17 further comprising a sleeve which forms said control chamber and receives said control portion , said sleeve forming a passage for communication between the control portion annulus and the bleed passage.
Claim 22
Dependent Claim
29 words
The accumulator injector of claim 10 wherein said solenoid valve means comprises an armature forming a receptacle and a sealing element received in said receptacle in floating relationship therewith.
Claim 23
Dependent Claim
57 words
The accumulator injector of claim 10 wherein the solenoid valve assembly comprises : a solenoid body including a coil; an armature magnetically attractable upon energization of said coil for axial movement; and a valve member connecting said armature and forming a sealing surface and an interior passage to provide fluid communication between said armature and solenoid body.
References Cited (Backward Citations)
No citation records indexed.
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