| 摘要 |
An intake or exhaust valve assembly for use in a four cycle internal combustion engine including a primary poppet valve, said primary poppet valve having at least one aperture disposed through its valve body and a secondary poppet valve body mounted to seal when engaged to the primary valve body, said secondary valve body having at least one aperture and a biasing means for moving the secondary valve body away from the primary valve body during the initial opening process when the primary valve is accelerating to its opened position. In the closed position of an intake port, the primary valve apertures are not aligned with the secondary valve apertures thus forming a sealed closure across the port. During the opening process of the intake cycle the biasing means moves the secondary valve body away from the primary valve body, thereby permitting intake charge to flow through the apertures disposed in the primary and the secondary valve bodies. In continuation during the final travel of the primary valve to the full opening said secondary valve is unseated by a stop causing the secondary valve to travel in unison to the maximum valve lift position, greatly increasing the volumetric efficiency of the engine.
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