EP0283154A1
Expired / Lapsed
EP
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Fuel injection nozzle
Assignee: ZF International UK Ltd
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Filing: 1988-02-26
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Granted: —
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Expires: 2008-02-26
Abstract
Abstract A fuel injection nozzle for supplying fuel to an internal combustion engine includes a valve member (17) which co-operates with a seating surface (14) in a nozzle body to prevent fuel flow through an outlet orifice (13) extending from a "sac" volume (16) downstream of the seating surface. The valve body and the valve member downstream of the seating surface define spaced parallel truncated conical surfaces which have a cone angle less than that of the seating surface. The surface defines a flow restriction gap the degree of restriction offered by the gap decreasing at a lower rate as the valve member is lifted from the seating surface, than the degree of restriction between the valve member (17) and the seating surface (14).
Inventors
- 👤 David John Gaskell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 13:44
CPC Classifications
F; F02; F02M; F02M61/00; F02M61/16; F02M61/18; F02M61/1806; F02M61/182; F02M61/04; F02M61/06; F02M2200/00; F02M2200/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
A fuel injection nozzle for supplying fuel to an internal combustion engine, the nozzle being of the so-called inwardly opening type and comprising a nozzle body (10) in which is defined a bore (11) at one end of which is formed a conical seating surface (14) the nozzle body defining a further surface downstream of the seating surface and which forms a "sac" volume (16), an outlet orifice (13) extending from said volume, a valve member (17) slidable in the bore and adapted for co-operation with the seating surface to control the flow of fuel through the outlet orifice from a fuel inlet characterized by a flow restriction gap downstream of the seating surface, said gap being defined between an extension (21, 23, 28) of the valve member and the valve body, the degree of restriction offered by said gap decreasing at a lower rate as the valve member is lifted from the seating surface, than the degree of restriction between the valve member (17) and the seating surface (14).
Claim 2
Dependent Claim
170 words
A fuel injection nozzle for supplying fuel to an internal combustion engine, the nozzle being of the so-called inwardly opening type and comprising a nozzle body (10) in which is defined a bore (11) at one end of which is formed a conical seating surface (14) the nozzle body defining a further surface downstream of the seating surface and which forms a "sac" volume (16), an outlet orifice (13) extending from said volume, a valve member (17) slidable in the bore and adapted for co-operation with the seating surface to control the flow of fuel through the outlet orifice from a fuel inlet characterized by a flow restriction gap downstream of the seating surface, said gap being defined between an extension (21, 23, 28) of the valve member and the valve body, the degree of restriction offered by said gap decreasing at a lower rate as the valve member is lifted from the seating surface, than the degree of restriction between the valve member (17) and the seating surface (14).
Claim 3
Dependent Claim
59 words
A nozzle according to Claim 1 characterized in that the nozzle body defines a truncated surface (15) immediately downstream of the seating surface (14), the extension (21) of the valve member defining a surface complementary to but spaced from said truncated surface (15), the cone angle of said truncated surface (15) being smaller than that of the seating surface.
Claim 4
Dependent Claim
84 words
A nozzle according to Claim 1 characterized in that the nozzle defines a truncated surface (15) immediately downstream of the seating surface (14), said extension (23) of the valve member having a cylindrical surface and extending into the "sac" volume (16), the valve member defining a junction (25) where the cylindrical surface merges into a conical end (24), said junction and said truncated surface (15) defining said gap, the cone angle of said truncated surface (15) being less than that of the seating surface.
Claim 5
Dependent Claim
77 words
A nozzle according to Claim 1 characterized in that the nozzle body defines a curved surface (26) extending between said conical seating surface (14) and the further surface which defines the "sac" volume (16), said extension 23 of the valve member having a cylindrical surface and extending into the "sac" volume, the valve member defining a junction (25) where the cylindrical surface merges into a conical end (24), said junction and said curved surface defining said gap.
Claim 6
Dependent Claim
62 words
A nozzle according to Claim 1 characterized in that said seating surface (14) and the further surface define an annular control edge (27) and the extension (28) of the valve member has a truncated conical surface which forms with the edge said gap, the cone angle of the truncated conical surface of said extension being smaller than that of the seating surface.
References Cited (Backward Citations)
DE837337C
Cited
DE894789C
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FR2383320A1
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GB2029508A
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GB2034816A
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GB2083134A
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US4524914A
Cited
GB2138073A
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GB2143274A
Cited
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