Stratified scavenging two-cycle engine

Details Stratified scavenging two-cycle engine Stratified scavenging two-cycle engine

2007-06-21

2011-11-29

Cuff, Michael (Department: 3783)

Internal-combustion engines

Two-cycle

Rear compression

C123S0730AE, C123S0730PP

Reexamination Certificate

active

08065981

ABSTRACT:
A stratified scavenging two-cycle engine that has a simpler structure than conventional stratified scavenging two-cycle engines and that has an excellent blow-by prevention effect etc. In an air intake stroke, lead air passes a lead-air port (12) etc. to flow into an inner space of a piston (6) during a period from the instant at which a lateral groove (21b) starts to superpose on the lead-air port (12) until the superposing between the lateral groove (21b) and the lead-air port (12) disappears after the piston (6) passes its top dead center. Further, in a scavenging stroke, lead air passes a scavenging path (17) etc. to flow into a cylinder (4) from a scavenging port (18) during a period from the instant at which a scavenging connection opening (20) and a scavenging inflow opening (19) start to superpose on each other until the superposing between the scavenging connection opening (20) and the scavenging inflow opening (19) disappears after the piston (6) passes its bottom dead center. Then, a mixture gas passes the inside of the piston (6) to flow into the cylinder (4) from the scavenging port (18).

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Extended European Search Report (EESR) dated Jun. 14, 2011 (in English) in counterpart European Application No. 07767346.5.

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