PROBLEM TO BE SOLVED: To provide a compact and inexpensive PTO (Power Take-off) speed change mechanism capable of improving efficiency of the energy to be transmitted to an oil pump of a working machine by changing the output rotation of the PTO.;SOLUTION: The PTO mechanism for transmitting the power of a prime mover taken out of the PTO mechanism to an oil pump of a working machine comprises a first shaft with first gears connected to each other in series being arranged therearound, a second shaft with a one-way clutch and a fourth gear being integrally rotated, and a third shaft with a second gear and a third gear being arranged thereon. When the number of rotation of the prime mover is below a predetermined value, the rotation of the first shaft is transmitted to the oil pump via the one-way clutch and the second shaft; and when the number of rotation of the prime mover exceeds the predetermined value, the rotation of the first shaft is transmitted to the oil pump via the clutch, the first gear, the second gear, the third shaft, the third gear, the fourth gear and the second shaft.;COPYRIGHT: (C)2008,JPO&INPIT
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