EP0331200A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fuel injection nozzle
Assignee: Yamaha Motor Co Ltd
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Filing: 1989-03-03
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Granted: —
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Expires: 2009-03-03
Abstract
Abstract An accumulator type fuel injection nozzle (11) having a relief valve (53) for the control chamber (43) that is controlled by an electromagnet construction (58) in such a way so as to reduce flux losses to the outer housing (12) of the injection nozzle. In addition, the inlet (35) and return (57) ports of the nozzle are formed in the outer end of the nozzle and extend axially so that the mounting position of the nozzle will not be critical to the fuel connections to the pump and return lines.
Inventors
- 👤 Jun Taue
- 👤 Takeo Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 18:34
CPC Classifications
F; F02; F02M; F02M47/00; F02M47/02; F02M47/027; F02B; F02B2275/00; F02B2275/14; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
249 words
An accumulator type of injection nozzle comprised of an accumulator chamber adapted to be supplied with high pressure fuel, a nozzle port leading from said accumulator chamber, an injector valve moveable between a closed position and an opened position for controlling the discharge of fuel from said accumulator chamber through said nozzle port, a control chamber for receiving pressurized fuel, an actuating member supported for movement within said control chamber and associated with said injector valve for retaining said injector valve in its closed position when said control chamber is pressurized and for movement of said injector valve to its opened position when pressure is relieved in said control chamber, and relief valve means moveable between a closed position for maintaining pressure in said control chamber and an opened position for relieving said control chamber for effecting fuel discharge through said nozzle port, the improvement comprising said nozzle comprising an outer housing defining a cavity, an electromagnet within said cavity for moving said relief valve to one of said positions when said electromagnet is energized, said electromagnet being comprised of an armature surrounded by a winding, a yoke surrounding said winding and having an intermediate portion in proximity to one end thereof and extending inwardly toward said armature, said yoke having a first portion spaced from said outer housing inwardly of said cavity and a mounting portion fixed relative to said outer housing and connected to said intermediate portion by means for reducing flux leakage to said outer housing.
Claim 2
Dependent Claim
249 words
An accumulator type of injection nozzle comprised of an accumulator chamber adapted to be supplied with high pressure fuel, a nozzle port leading from said accumulator chamber, an injector valve moveable between a closed position and an opened position for controlling the discharge of fuel from said accumulator chamber through said nozzle port, a control chamber for receiving pressurized fuel, an actuating member supported for movement within said control chamber and associated with said injector valve for retaining said injector valve in its closed position when said control chamber is pressurized and for movement of said injector valve to its opened position when pressure is relieved in said control chamber, and relief valve means moveable between a closed position for maintaining pressure in said control chamber and an opened position for relieving said control chamber for effecting fuel discharge through said nozzle port, the improvement comprising said nozzle comprising an outer housing defining a cavity, an electromagnet within said cavity for moving said relief valve to one of said positions when said electromagnet is energized, said electromagnet being comprised of an armature surrounded by a winding, a yoke surrounding said winding and having an intermediate portion in proximity to one end thereof and extending inwardly toward said armature, said yoke having a first portion spaced from said outer housing inwardly of said cavity and a mounting portion fixed relative to said outer housing and connected to said intermediate portion by means for reducing flux leakage to said outer housing.
Claim 3
Dependent Claim
28 words
An accumulator type of injection nozzle as set forth in claim 1 wherein the relief valve has an annular armature that is juxtaposed to the yoke intermediate portion.
Claim 4
Dependent Claim
37 words
An accumulator type of injection nozzle as set forth in claim 1 wherein the means for reducing the flux leakage to the outer housing comprises a reduced cross-sectional area interconnecting the intermediate portion to the mounting portion.
Claim 5
Dependent Claim
30 words
An accumulator type of injection nozzle as set forth in claim 3 wherein the reduced portion is formed by at least one groove on one side of the intermediate portion.
Claim 6
Dependent Claim
30 words
An accumulator type of injection nozzle as set forth in claim 4 wherein the reduced portion is formed by a further groove on the other side of the intermediate portion.
Claim 7
Dependent Claim
61 words
An accumulator type of injection nozzle as set forth in claim 5 wherein the first yoke portion is a first cylindrical portion and the mounting portion is a second cylindrical portion having a greater diameter than the first portion and wherein the first and second portions are joined in to each other at the intermediate portion through the reduced area portion.
Claim 8
Dependent Claim
72 words
An accumulator type of injection nozzle as set forth in claim 6 wherein the outer housing has a first port for admitting fuel under pressure to the accumulator chamber and the control chamber and a second port for returning fuel from the control chamber to a source of fuel, at least one of said ports extending axially and being formed in the end of the outer housing spaced from the nozzle port.
Claim 9
Dependent Claim
28 words
An accumulator type of injection nozzle as set forth in claim 7 wherein both of the fuel ports extend axially at the one end of the outer housing.
Claim 10
Dependent Claim
65 words
An accumulator type of injection nozzle forth in claim 8 wherein the outer housing is comprised of a first portion defining the accumulator chamber and a second portion defining the cavity in which the electromagnet is contained and further including a closure plate clamped between said housing portions and separating said accumulator chamber from said cavity, said control chamber being formed in said closure plate.
Claim 11
Dependent Claim
26 words
An accumulator type of injection nozzle as set forth in claim 9 wherein the ports are formed at least in part in the second housing portion.
Claim 12
Dependent Claim
232 words
An accumulator type of injection nozzle comprised of an an outer housing having a threaded part for attachment to an engine and defining an accumulator chamber adapted to be supplied with high pressure fuel, a nozzle port leading from said accumulator chamber, an injector valve moveable between a closed position and an opened position for controlling the discharge of fuel from said accumulator chamber through said nozzle port, a control chamber for receiving pressurized fuel, an actuating member supported for movement within said control chamber and associated with said injector valve for retaining said injector valve in its closed position when said control chamber is pressurized and for movement of said injector valve to its opened position when pressure is relieved in said control chamber, and relief valve means moveable between a closed position for maintaining pressure in said control chamber and an opened position for relieving said control chamber for effecting fuel discharge through said nozzle port, the improvement comprising a fuel inlet port in said outer housing for admitting fuel to said accumulator chamber and to said control chamber from a source and a return port for returning fuel to the source from the control chamber when said relief valve is opened, at least one of said ports being formed in the end of said outer housing remote from the nozzle port and extending axially relative to said threaded portion.
Claim 13
Dependent Claim
232 words
An accumulator type of injection nozzle comprised of an an outer housing having a threaded part for attachment to an engine and defining an accumulator chamber adapted to be supplied with high pressure fuel, a nozzle port leading from said accumulator chamber, an injector valve moveable between a closed position and an opened position for controlling the discharge of fuel from said accumulator chamber through said nozzle port, a control chamber for receiving pressurized fuel, an actuating member supported for movement within said control chamber and associated with said injector valve for retaining said injector valve in its closed position when said control chamber is pressurized and for movement of said injector valve to its opened position when pressure is relieved in said control chamber, and relief valve means moveable between a closed position for maintaining pressure in said control chamber and an opened position for relieving said control chamber for effecting fuel discharge through said nozzle port, the improvement comprising a fuel inlet port in said outer housing for admitting fuel to said accumulator chamber and to said control chamber from a source and a return port for returning fuel to the source from the control chamber when said relief valve is opened, at least one of said ports being formed in the end of said outer housing remote from the nozzle port and extending axially relative to said threaded portion.
Claim 14
Dependent Claim
28 words
An accumulator type of injection nozzle as set forth in claim 11 wherein both of the fuel ports extend axially at the one end of the outer housing.
References Cited (Backward Citations)
No citation records indexed.
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