| 摘要 |
PURPOSE:To enable execution of accurate rocking having desired frequency, by a method wherein an annular piston is unrotatably and axially movably situated in an annular cylinder, and a rocking input shaft is directly rocked by means of an annular piston. CONSTITUTION:An annular cylinder 45 is disposed to the outer periphery of a rocking input shaft 28, and an annular piston 46 is unrotatably and axially movable engaged internally of the annular cylinder 45. A helical groove 60 is formed in either the inner periphery of the annular piston 46 or the outer periphery of the rocking input shaft 28, and a guide pin 50, engaged with the helical groove 60, is situated to the other. Since, by means of the helical groove 60 and the guide pin 50, the rocking input shaft 28 can be rocked through axial movement of the annular piston 46, rocking can be reliably produced even if it has a high vibration width and high frequency. |
