Piston for two-cycle engines
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorsMasaki Okazaki, Kazutoshi Sato, Hiroaki Fujimoto
Life of this patent
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Abstract
Several embodiments of cooling arrangements for the pistons of an internal combustion engine operating on a two-cycle, crankcase compression principle. The cooling arrangement comprises a passage that is formed in the piston and which communicates the ports of the engine with each other when the piston is in confronting relationship with them so as to effect a cooling air flow across the piston through the communicating passage.
Claims20
In a two-cycle internal combustion engine comprising a cylinder defining a cylinder bore, a crankcase at one end of said cylinder bore, a combustion chamber at the other end of said cylinder bore, a piston reciprocating in said cylinder bore and having a head portion facing said combustion chamber, a pair of circumferentially spaced ports extending through said cylinder for communication with said cylinder bore upon reciprocation of said piston in said cylinder bore at least one of said ports being formed at the end of a passage extending from said crankcase and comprising a scavenge port, the improvement comprising passage means formed in said piston for permitting flow between said scavenge port and another of said ports when said piston is in confronting relationship with said ports for effecting a cooling flow across said piston to dissipate heat therefrom.
In a two-cycle internal combustion engine comprising a cylinder defining a cylinder bore, a piston reciprocating in said cylinder bore and having a head portion facing a combustion chamber, a pair of circumferentially spaced scavenge ports extending through said cylinder for communication with said cylinder bore upon reciprocation of said piston in said cylinder bore, the improvement comprising passage means formed in said piston for permitting flow between said scavenge ports when said piston is in confronting relationship with said ports for effecting a cooling flow across said piston to dissipate heat therefrom.
Dependencies are inferred from the claim text.