Stratified scavenging two-cycle engine and cylinder block theref

Details Stratified scavenging two-cycle engine and cylinder block theref Stratified scavenging two-cycle engine and cylinder block theref

1999-02-16

2000-11-28

McMahon, Marguerite

Internal-combustion engines

Two-cycle

Rear compression

A01D 3400, A01D 7518

Patent

active

061520934

ABSTRACT:
A stratified scavenging two-cycle engine, having excellent scavenging performance and a simple structure which can be manufactured at low cost, includes a cast cylinder block (2, 2a) containing a cylinder chamber (9) and two scavenging ports (14, 14, 14a, 14a), which are provided in opposite portions of the interior wall surface of the cylinder chamber (9). Each scavenging port (14, 14a) and the crank chamber (7) are connected via a scavenging flow passage (20) which includes a generally horizontally extending scavenging flow passage segment (22, 22a) and a generally vertically extending scavenging flow passage segment (21). Two recesses (23, 23, 23a, 23a) are provided in the outer surface of the cylinder block (2, 2a) with each recess being an outwardly directed extension of a respective horizontally extending scavenging flow passage segment. An air supply flow passage member (30, 30a) is attached to the cylinder block to cover a respective recess. Each scavenging flow passage (20) and an air supply flow passage (31) are connected through a check valve (32).

REFERENCES:
patent: 3881454 (1975-05-01), Jaulmes
patent: 4026254 (1977-05-01), Ehrlick
patent: 4294202 (1981-10-01), Boyesen
patent: 5740767 (1998-04-01), Kaku et al.

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