Two-cycle engine

Patent · Tue Jun 16 04:00:00 EDT 1987

OSTI ID:6299817

Miyata, T; Iwashita, K; Taniuchi, K; Yamamoto, H; Nakamichi, K

A two-cycle engine is described comprising: a cylinder block having a cylinder head thereon. The cylinder block has a cylinder having an axis, an exhaust port formed in a side wall of the cylinder and has opposite ends spaced along the axis of the cylinder, and the cylinder block has an exhaust passage communicating with the exhaust port; a piston received in the cylinder for reciprocal movement along the axis of the cylinder for closing and opening the exhaust port; and port timing control means for varying a timing of the opening of the exhaust port by the piston. The port timing control means comprises a first valve mounted within the exhaust passage adjacent to one end of the exhaust port closer to the cylinder head and having a port timing control surface. A second valve is mounted on the cylinder block between the cylinder head and the first valve and has a closure surface, and urging means acting on the second valve to always urge it against the first valve. The first valve is operable to be angularly moved about an axis generally perpendicular to the axis of the cylinder into and out of an extended position where the control surface is disposed slightly below the one end of the exhaust port to close a part of the exhaust port. The second valve is movable along a generally straight path into and out of an extended position where the closure surface closes that portion of the exhaust port lying between the one end of the exhaust port and the first valve. The second valve is movable in synchronism with the angular movement of the first valve through the urging means.

• Assignee: Honda Giken Kogyo Kabushiki Kaisha
• Patent Number(s): US 4672925
• OSTI ID: 6299817
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
330602 -- Vehicle Design Factors-- Engine-Transmission Matching
CONTROL EQUIPMENT
CYLINDERS
DESIGN
ENGINES
EQUIPMENT
EXHAUST SYSTEMS
FLOW REGULATORS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MECHANICAL TRANSMISSIONS
OPERATION
PISTONS
RODS
TIMING PROPERTIES
VALVES
VELOCITY