| 摘要 |
A rotary valve structure is provided for a four-stroke engine having a cylinder in which a piston is brought by a crankshaft to move in reciprocating motion and a combustion chamber is provided to communicate with separated gas-in and gas-out passages. The rotary valve structure includes an intake and an exhaust rotary rod rotatably located at a gas inlet of the gas-in passage and a gas outlet of the gas-out passage, respectively. The intake and the exhaust rotary rods are rotated by a transmission mechanism driven by the crankshaft, such that an intake and an exhaust hole radially extended through the intake and the exhaust rotary rod, respectively, are turned either to communicate the gas-in and the gas-out passages with the combustion chamber or to close the gas-in and said gas-out passages at the gas inlet and the gas outlet.
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