US4459948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glow plug for internal combustion engines
Assignee: BERU-WERK ALBERT RUPRECHT & Co KG A GERMAN CORP GmbH
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Filing: 1981-10-20
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Granted: 1984-07-17
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Expires: 2001-10-20
Abstract
Abstract A glow plug for internal combustion engines, the plug including a plug barrel, an electric heater for igniting the fuel, and a device for the metered injection of liquid fuel into the glow plug. The plug includes a centrally positioned heating pin in a pasageway through which the metered fuel passes, the heating pin including a thickened portion to define a valve. A chamber is provided in the glow plug barrel and is heated by the electric heater for evaporating the injected liquid fuel. The barrel includes a tube around the heating pin tip to provide a mixing chamber that contains concentrically arranged bores that extend into the mixing chamber and are connected to an air supply line in the vicinity of the opposite end of the plug barrel to permit air and evaporated fuel to mix to give improved combustion.
Inventors
- 👤 Paul Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:50
CPC Classifications
F; F23; F23Q; F23Q7/00; F23Q7/001; F02; F02N; F02N19/00; F02N19/02; F02N19/04; F02N19/06; F02P; F02P19/00; F02P19/02
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
103 words
A glow plug for internal combustion engines, particularly as a starting aid for diesel engines, said plug comprising: a plug barrel, at least one electric heater for igniting the fuel, and a device for the metered injection of liquid fuel into the glow plug, wherein a chamber heated by the electric heater is provided for evaporating the injected liquid fuel and wherein the flow plug barrel contains concentrically arranged bores, which pass out of the plug barrel on the combustion chamber side area of the plug and are connected to an air supply line in the vicinity of the opposite plug barrel end.
Claim 2
Dependent Claim
103 words
A glow plug for internal combustion engines, particularly as a starting aid for diesel engines, said plug comprising: a plug barrel, at least one electric heater for igniting the fuel, and a device for the metered injection of liquid fuel into the glow plug, wherein a chamber heated by the electric heater is provided for evaporating the injected liquid fuel and wherein the flow plug barrel contains concentrically arranged bores, which pass out of the plug barrel on the combustion chamber side area of the plug and are connected to an air supply line in the vicinity of the opposite plug barrel end.
Claim 3
Dependent Claim
31 words
A glow plug according to claim 1, wherein the bores are widened to form an annular clearance arranged in the plug barrel substantially concentrically to the longitudinal axis of the barrel.
Claim 4
Dependent Claim
25 words
A glow plug according to claim 2, wherein the discharge port of the concentric annular clearance is constructed in the form of a ring nozzle.
Claim 5
Dependent Claim
18 words
A glow plug according to claim 3, wherein a protective tube is arranged around the heating pin tip.
Claim 6
Dependent Claim
23 words
A glow plug according to claim 4, wherein the heating pin is provided with internal, series-connected heating coils having widely differing temperature coefficients.
Claim 7
Dependent Claim
27 words
A glow plug according to claim 5, wherein the heating pin is provided with an internal heating coil made from a material with a low temperature coefficient.
Claim 8
Dependent Claim
104 words
A glow plug for internal combustion engines, particularly as a starting aid for diesel engines, said plug comprising: a plug barrel, at least one electric heater for igniting the fuel and a device for the metered injection of liquid fuel into the glow plug, wherein a chamber heated by the electric heater is provided for evaporating the injected liquid fuel and wherein the heated chamber for evaporating the injected liquid fuel is separated from the combustion chamber and is connected to the latter by a valve, which is opened when the temperature in the evaporating chamber is above the evaporation temperature of the fuel.
Claim 9
Dependent Claim
104 words
A glow plug for internal combustion engines, particularly as a starting aid for diesel engines, said plug comprising: a plug barrel, at least one electric heater for igniting the fuel and a device for the metered injection of liquid fuel into the glow plug, wherein a chamber heated by the electric heater is provided for evaporating the injected liquid fuel and wherein the heated chamber for evaporating the injected liquid fuel is separated from the combustion chamber and is connected to the latter by a valve, which is opened when the temperature in the evaporating chamber is above the evaporation temperature of the fuel.
Claim 10
Dependent Claim
23 words
A glow plug according to claim 7, wherein the opening of the valve is initiated by a specific volume expansion of the heater.
Claim 11
Dependent Claim
15 words
A glow plug according to claim 8, wherein the electric heater includes a heating pin.
Claim 12
Dependent Claim
23 words
A glow plug according to claim 9, wherein said pin has a clearly defined thermal elongation which controls the opening of the valve.
Claim 13
Dependent Claim
31 words
A glow plug according to claim 10, wherein the heating pin in the vicinity of the heating pin tip in the unheated state separates the evaporating chamber from the combustion chamber.
Claim 14
Dependent Claim
42 words
A glow plug according to claim 11, wherein the heating pin has a thickened portion in the vicinity of its tip which, in the unheated state, overlaps in a gas-tight sealing manner the outlet from the evaporating chamber to the combustion chamber.
Claim 15
Dependent Claim
61 words
A glow plug according to claim 12, wherein an evaporating chamber is provided within the plug barrel and extends concentrically around the heating pin and over approximately half its length, the outlet of said evaporating chamber towards the combustion chamber is sealable in valve-like manner by a concentric thickened portion of the heating pin in the vicinity of the pin tip.
Claim 16
Dependent Claim
21 words
A glow plug according to claim 13, wherein the thickened portion is elastic in the vicinity of the heating pin tip.
Claim 17
Dependent Claim
26 words
A glow plug according to claim 14, wherein the thickened portion is constructed as a ring secured to the heating pin and defines a sealing seat.
Claim 18
Dependent Claim
18 words
A glow plug according to claim 15, wherein a protective tube is arranged around the heating pin tip.
Claim 19
Dependent Claim
23 words
A glow plug according to claim 16, wherein the heating pin is provided with internal, series-connected heating coils having widely differing temperature coefficients.
Claim 20
Dependent Claim
31 words
A glow plug according to claim 17, wherein the heating pin is provided with an internal heating coil made from a material such as nickel wire having a positive temperature coefficient.
Claim 21
Dependent Claim
27 words
A glow plug according to claim 18, wherein the heating pin is provided with an internal heating coil made from a material with a low temperature coefficient.
Claim 22
Dependent Claim
27 words
A glow plug according to claim 18, wherein the heating pin is provided with an internal heating coil made from a material with a low temperature coefficient.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |