| 摘要 |
A free-link, one end thereof being pivoted on the piston pin while the other end thereof being pivoted on the cross-link, is restrained by swinging movement of the cross-link about the pivoting point on the crankcase, so that in an intermediate position of the reciprocating movement of the piston, the inclination of the free-link to the reciprocating direction of the piston (the piston axial line direction) is set to be small while the straight line connecting the top and bottom dead centers of the crank pin together meets approximately at a right angle with the straight line connecting the pivoting point of the cross-link on the crankcase to the pivoting point thereof on the connection rod. Thereby, wear and tear on the sliding surfaces due to the frictional loads on the sliding surface between the piston/cylinder and on the crank pin are reduced and loss of transmission power is also reduced.
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