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1. EP1900921 - TWO-CYCLE ENGINE

Office European Patent Office
Application Number 06767829
Application Date 04.07.2006
Publication Number 1900921
Publication Date 19.03.2008
Publication Kind A4
IPC
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02
COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
B
INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
33
Engines characterised by provision of pumps for charging or scavenging
02
Engines with reciprocating-piston pumps; Engines with crankcase pumps
06
with reciprocating-piston pumps other than simple crankcase pumps
10
with the pumping cylinder situated between working cylinder and crankcase, or with the pumping cylinder surrounding working cylinder
12
the rear face of working piston acting as pumping member and co-operating with a pumping chamber isolated from crankcase, the connecting-rod passing through the chamber and co-operating with movable isolating member
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01
MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
B
MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
9
Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to groups F01B1/-F01B7/181
02
with crankshaft
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02
COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
B
INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
25
Engines characterised by using fresh charge for scavenging cylinders
14
using reverse-flow scavenging, e.g. with both inlet and outlet ports arranged near bottom of piston stroke
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02
COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
B
INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
25
Engines characterised by using fresh charge for scavenging cylinders
14
using reverse-flow scavenging, e.g. with both inlet and outlet ports arranged near bottom of piston stroke
16
the charge flowing upward essentially along cylinder wall opposite the inlet ports
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02
COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
M
SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
69
Low-pressure fuel-injection apparatus
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
H
GEARING
37
Combinations of mechanical gearings, not provided for in groups F16H1/-F16H35/122
12
Gearings comprising primarily toothed or friction gearing, links or levers, and cams, or members of at least two of these three types
F02B 33/12
F01B 9/02
F02B 25/14
F02B 25/16
F02M 69/00
F16H 37/12
CPC
F02B 33/12
F01B 9/026
F02B 25/04
F02B 25/14
F02B 25/16
Applicants LWJ CO LTD
Inventors OGAI SHUJI
TAKACHI KEN
Priority Data 2005196862 05.07.2005 JP
2006313298 04.07.2006 JP
Title
(DE) ZWEITAKTMOTOR
(EN) TWO-CYCLE ENGINE
(FR) MOTEUR DEUX TEMPS
Abstract
(EN)
Size reduction and pollution reduction are promoted in a two cycle engine. A two cycle engine includes: a cylinder which contains a piston so as to allow reciprocating movement of the piston; a scavenging gas reserving chamber which covers a lower opening of the cylinder so as to seal the lower opening; an intake portion which is provided in the scavenging gas reserving chamber; a scavenging passage which provides communication between the scavenging gas reserving chamber and the cylinder; a connecting rod which is connected to the piston and passes through the scavenging gas reserving chamber; a crank mechanism which allows linear reciprocating movement of the connecting rod; and a sealing portion which is provided in an insertion hole in the scavenging gas reserving chamber through which the connecting rod passes and which allows linear reciprocating movement of the connecting rod but seals the scavenging gas reserving chamber. The two cycle engine may have a structure in which the intake portion has a structure for drawing outside air into the scavenging gas reserving chamber and in which a spraying mechanism for spraying fuel is provided in the cylinder head.