US4340019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion diesel engine
Assignee: Volkswagen AG
•
Filing: 1980-12-23
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Granted: 1982-07-20
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Expires: 2000-12-23
Abstract
Abstract An internal combustion diesel engine having a piston sliding in a cylinder and forming a main combustion chamber between the piston and the cylinder head. The cylinder head also has a pre-combustion chamber which communicates by a connecting passage with the main combustion chamber, with a fuel injection nozzle and glow plug arranged to project into the pre-combustion chamber. In addition, a smaller auxiliary chamber is provided which communicates with the pre-combustion chamber by a nozzle shaped aperture, and supplies additional combustion air to the pre-combustion chamber to help effectuate complete combustion, even at high engine loads, of the air-fuel mixture.
Inventors
- 👤 Konrad Barnert
- 👤 Ingolf Lohner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:11
CPC Classifications
F; F02; F02B; F02B19/00; F02B19/14; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
156 words
In an internal combustion diesel engine having a piston sliding in a cylinder, said cylinder closed by a cylinder head forming a main combustion chamber, and having a pre-combustion chamber arranged in the cylinder head and communicating by a connecting passage with the main combustion chamber, a fuel injection nozzle projecting into said pre-combustion chamber, and a glow plug projecting into said pre-combustion chamber, the improvement wherein said engine includes auxiliary chamber means for storing oxygen during the initial period of combustion comprising an auxiliary chamber which is smaller than said pre-combustion chamber and communication means between said auxiliary chamber and said pre-combustion chamber including a nozzle-shaped aperature for introducing air contained in said auxiliary chamber into said pre-combustion chamber through said aperture, wherein the stored oxygen is drawn out of said auxiliary chamber, after ignition of the fuel-air mixture in the pre-combustion chamber is initiated, for combustion with remaining unburned fuel in said pre-combustion chamber.
Claim 2
Dependent Claim
156 words
In an internal combustion diesel engine having a piston sliding in a cylinder, said cylinder closed by a cylinder head forming a main combustion chamber, and having a pre-combustion chamber arranged in the cylinder head and communicating by a connecting passage with the main combustion chamber, a fuel injection nozzle projecting into said pre-combustion chamber, and a glow plug projecting into said pre-combustion chamber, the improvement wherein said engine includes auxiliary chamber means for storing oxygen during the initial period of combustion comprising an auxiliary chamber which is smaller than said pre-combustion chamber and communication means between said auxiliary chamber and said pre-combustion chamber including a nozzle-shaped aperature for introducing air contained in said auxiliary chamber into said pre-combustion chamber through said aperture, wherein the stored oxygen is drawn out of said auxiliary chamber, after ignition of the fuel-air mixture in the pre-combustion chamber is initiated, for combustion with remaining unburned fuel in said pre-combustion chamber.
Claim 3
Dependent Claim
27 words
An internal combustion engine according to claim 1, wherein said auxiliary chamber is designed to have a volume of 5-20% of the volume of the pre-compression chamber.
Claim 4
Dependent Claim
61 words
An internal combustion engine according to claim 1 or 2, wherein said glow plug is mounted in said cylinder head in a glow-plug mounting bore, said auxiliary chamber is designed as a recess encircling said glow plug, and said glow plug and said mounting bore are designed to form a ring slot communicating between said auxiliary chamber and said pre-combustion chamber.
Claim 5
Dependent Claim
62 words
An internal combustion engine according to claim 1 or 2, wherein said fuel injection nozzle means is adapted to spray fuel into said pre-combustion chamber along an injection path, and said auxiliary chamber is arranged on the periphery of said pre-combustion chamber and so that its nozzle-shaped communicating aperture lies within the region of the injection path of said injection nozzle means.
Claim 6
Dependent Claim
22 words
An internal combustion engine according to claim 1, wherein the walls of the auxiliary chamber are provided with a catalytically active coating.
Claim 7
Dependent Claim
27 words
An internal combustion engine according to claim 1, further comprising a porous material having a high capacity for the storage of oxygen disposed in said auxiliary chamber.
Claim 8
Dependent Claim
21 words
An internal combustion engine according to claim 6, wherein said material comprises a ceramic material containing zirconium or a zirconium compound.
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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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |