To provide a liquid pressure driving gear whereby feedback control can be operated even in the case of driving a a liquid pressure cylinder by pressure liquid from a liquid pressure pump driven by an electric motor.
A liquid pressure pump 1 driven by an electric motor 6 to be capable of rotating in both directions is provided, both ports 14, 16 of a liquid pressure cylinder 12 and both ports 2, 4 of the liquid pressure pump 1 are respectively connected. A speed detection sensor 28 detecting a rotational speed of the electric motor 6 and a position detection sensor 32 detecting displacement of a position by the liquid pressure cylinder 12 are provided. Based on a speed detected by the speed detection sensor 28 and a position detected by the position detection sensor 32, the electric motor 6 is feedback controlled, pressure liquid from the liquid pressure pump 1 is supplied to the liquid pressure cylinder 12, it is driven.
TAKAGI YOSHITOKU