| 摘要 |
a moving core(5) including passages(13 and 14) formed in hollow portion of a cam shaft(3) in the shaft direction, and another passage(12) that communicates with the passages(13 and 14), having a piston(6); a variable gear(17) that is connected to the moving core(5) with a connection rod(15), including a spring(21) inserted into one side thereof, inner teeth that engage with a helical gear(18) on the cam shaft(3); and outer teeth that engage with a sprocket(19); a second hydraulic chamber(B) formed by the sprocket(19); and a first hydraulic chamber(A) that is open/closed by the movement of a ball(11).
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