Two-stroke internal combustion engine
AssigneeAktiebolaget Electrolux
InventorPär Martinsson
Life of this patent
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Abstract
The invention relates to a crankcase scavenged internal combustion engine (1) of two-stroke type, comprising a cylinder (2) with an inlet tube (10) for air/fuel mixture and a number of transfer ducts (20), a carburetor (12) connected to the inlet tube (10), and an air inlet (24) provided with a restriction valve (25) whereby a piston ported air passage (23, 22, 26, 21) is arranged between the air inlet (24) and the upper part of the transfer ducts (20). The engine's air inlet (24) extends at least partly below and outside the carburetor (12), resulting in a more compact engine design and improved use of the space around the cylinder. Moreover, the cooling air gets better access to the cylinder.
Claims10
A two-stroke, crankcase-scavenged internal combustion engine (1) including:
- a cylinder (2);
- an inlet tube (10) operatively connected to the cylinder (2) for introducing air/fuel mixture to the cylinder (2);
- a transfer duct (20) extending from the cylinder (2) to a crankcase (3) area of the engine (1), the crankcase (3) being located toward a lower portion of the engine (1);
- a carburetor (12) connected to the inlet tube (10);
- and
- an air inlet (24) equipped with a restriction valve (25);
- a piston-ported air passage (23, 22, 26, 21) arranged between the air inlet (24) and the transfer duct (20) at the cylinder (2):
- wherein the inlet tube (10), the carburetor (12), the air inlet (24), and the air passage (23, 22, 26, 21) are configured with respect to the engine (1) such that the air inlet (24) at least partly extends below the carburetor (12).
A two-stroke, crankcase-scavenged internal combustion engine (1) including:
- a cylinder (2) having a cylinder axis extending to a crankcase (3);
- an inlet tube (10) operatively connected to the cylinder (2) for introducing air/fuel mixture to the cylinder (2);
- a transfer duct (20) extending from the cylinder (2) to a crankcase (3) area of the engine (1), the crankcase (3) being located toward a lower portion of the engine (1);
- a carburetor (12) connected to the inlet tube (10);
- and
- an air inlet (24) equipped with a restriction valve (25);
- a piston-ported air passage (23, 22, 26, 21) arranged between the air inlet (24) and the transfer duct (20) at the cylinder (2):
- wherein the inlet tube (10), the carburetor (12), the air inlet (24), and the air passage (23, 22, 26, 21) are configured with respect to the engine (1) such that the air inlet (24) is closer to the crankcase (3) than the carburetor (12) along the direction of the cylinder axis.
A two-stroke, crankcase-scavenged internal combustion engine (1) including:
- a cylinder (2) having a stroke axis;
- an inlet tube (10) operatively connected to the cylinder (2) for introducing air/fuel mixture to the cylinder (2);
- a transfer duct (20) extending from the cylinder (2) to a crankcase (3) area of the engine (1);
- a carburetor (12) connected to the inlet tube (10);
- and
- an air inlet (24) equipped with a restriction valve (25);
- a piston-ported air passage (23, 22, 26, 21) arranged between the air inlet (24) and the transfer duct (20) at the cylinder (2):
- wherein the inlet tube (10), the carburetor (12), the air inlet (24), and the air passage (23, 22, 26, 21) are configured with respect to the engine (1) such that air flowing through the air inlet (24) and the air passage (23, 22, 26, 21) traverses from one side of inlet tube (10) and the carburetor (12) to another side of the inlet tube (10) and the carburetor (12) along the direction of the cylinder stroke axis.
Dependencies are inferred from the claim text.