EP0503973B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Heat-insulating engine with swirl chambers
Assignee: Isuzu Motors Ltd
•
Filing: 1992-03-13
•
Granted: 1995-05-17
•
Expires: 2012-03-13
Abstract
No abstract record available.
Inventors
- 👤 Hideo Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 04:55
CPC Classifications
F; F02; F02B; F02B19/00; F02B19/02; F02B19/16; F02B19/165; F02B77/00; F02B77/11; F02F; F02F7/00; F02F7/0085; F02F7/0087; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
242 words
A heat-insulating engine with swirl chambers sequentially operated in a cycle of an intake stroke, a compression stroke, an expansion stroke and an exhaust stroke, comprising a cylinder block (14) defining cylinders (18) therein, a cylinder head (7) fixed to said cylinder block (14), swirl chamber blocks (3) disposed inside cavities (19) formed in said cylinder head (7) and defining swirl chambers (2) having a heat-insulating structure, pistons (17) mounted for reciprocation inside said cylinders (18), main chambers (1) defined in piston heads (4) of said pistons (17), communication ports formed in said swirl chamber blocks (3) providing communication between said main chambers (1) and said swirl chambers (2), including small communication ports (8) having a small passage area and large communication ports (9) having a large passage area, formed in said swirl chamber blocks (3), fuel injection nozzles (6) having injection ports (16) thereof opening in to said swirl chambers (2), and control valves (11) provided for opening and closing said large communication ports (9); characterised in that said control valves (11) are arranged to open said large communication ports (9) in response to the pressure inside said swirl chambers (2), when this rises above a predetermined pressure, said control valves closing said large communication ports (9) during said compression stroke and opening at the time of the pressure rise in said swirl chambers (2) during said expansion stroke after the injection of the fuel from said fuel injection nozzles (6).
Claim 2
Dependent Claim
33 words
A heat-insulating engine with swirl chambers according to claim 1, wherein the passage area of said small communication ports (8) is not greater than 0.9% of the sectional area of said cylinder (18).
Claim 3
Dependent Claim
35 words
A heat-insulating engine with swirl chambers according to claim 1 or 2, wherein said passage area of said large communication ports (9) is not greater than 3% of the sectional area of said cylinder (18).
Claim 4
Dependent Claim
52 words
A heat-insulating engine with swirl chambers according to any preceding claim, wherein in operation the air introduced from said main chambers (1) into said swirl chambers (2) through said small communication ports (8) having a small passage area during said compression stroke forms a strong vortex flow inside said swirl chambers (2).
Claim 5
Dependent Claim
67 words
A heat-insulating engine with swirl chambers according to claim 4, wherein the fuel is injected from said fuel injection nozzle (6) into said vortex flow formed inside said swirl chambers (2), said fuel and the air mix to form a fuel-air mixture, said fuel-air mixture is ignited, said ignited fuel-air mixture burns rapidly and forms a combustion flame, and the pressure inside said swirl chambers (2) rises.
Claim 6
Dependent Claim
64 words
A heat-insulating engine with swirl chambers according to claim 5, wherein said control valves (11) are opened during said expansion stroke, so that said combustion flame inside said swirl chambers (2) flows rapidly from said swirl chambers (2) to said main chambers (1) during said expansion stroke, mixes with the air existing inside said main chambers (1), shortens the combustion time and burns satisfactorily.
Claim 7
Dependent Claim
29 words
A heat-insulating engine with swirl chambers according to any preceding claim, wherein said swirl chamber blocks (3) are constituted in a heat-insulating structure by a highly heat-resistant ceramic material.
Claim 8
Dependent Claim
24 words
A heat-insulating engine with swirl chambers according to any preceding claim, wherein said control valves (11) are made of a highly heat-resistant ceramic material.
Claim 9
Dependent Claim
55 words
A heat-insulating engine with swirl chambers according to any preceding claim, wherein said large communication ports (9) are formed on the side of the swirl chambers near the centre of said cylinders (18) and said small communication ports (8) are formed on the side of the swirl chambers near the periphery of said cylinders (18).
Claim 10
Dependent Claim
66 words
A heat-insulating engine with swirl chambers according to any preceding claim, wherein said swirl chambers (2) formed in said swirl chamber blocks (3) are formed so that the section thereof in the axial direction of said cylinders (18) are square wall surfaces and are formed in a square form with respect to the flowing direction of the air vortex flow introduced from said small communication ports.
Claim 11
Dependent Claim
37 words
A heat-insulating engine with swirl chambers according to claim 10, wherein the fuel injected from said injection ports (16) of said fuel injection nozzles (6) is directed so as to impinge obliquely against said square wall surfaces.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.