US 4,481,911 A · Stratified-charge cross-flow scavenged two-stroke cycle engine

Abstract

A stratified-charge cross-flow scavenged two-stroke cycle spark-ignition engine (1) includes a piston (2) having a raised crown (6) with a baffle (7) and chamfered sides (8, 9) and reciprocal in a cylinder (3) between a combustion chamber (4) and a crankcase (5). Transfer passage structure is disclosed wherein a pair of elongated scavenging air passages (17, 18) extend between the crankcase and combustion chamber on opposite sides of a shorter fuel-air transfer passage (11). A pair of scavenging air inlet ports (20, 21) in the combustion chamber are adjacent the fuel-air inlet port (12) therebetween and substantially distally opposite the exhaust port (16). The scavenging air inlet ports face the baffle at its edges along the chamfered sides of the piston crown.

Claims12

Dependent claims

A stratified-charge cross-flow scavenged two-stroke cycle spark-ignition engine comprising

a piston having a raised and chamfered crown with a baffle and reciprocal in a cylinder between a combustion chamber and a crankcase,
means for supplying fuel to said crankcase,
an exhaust port in said combustion chamber,
a plurality of transfer passages between said crankcase and said combustion chamber including
a fuel-air transfer passage between said crankcase and a fuel-air inlet port in said combustion chamber facing said baffle on said piston crown and approximately 180.degree. opposite said exhaust port,
air passage means having an input for receiving external air and extending between said crankcase and air inlet port means in said combustion chamber proximate said chamfered crown.

3 more elements

Dependencies are inferred from the claim text.

Stratified-charge cross-flow scavenged two-stroke cycle engine

Life of this patent

Stratified-charge cross-flow scavenged two-stroke cycle engine

Life of this patent

Abstract

Claims12