Pulsation prevention method of the hydraulic pump motor and hydraulic pump motor

摘要

Port 20a of the pair of valve plate provided in the bottom dead center and top dead center and a sliding rotational locus of the cylinder bore outside the region 9-1 9-7, ports 21a and a pair 20b, 21b between the and an accumulator oil passage 20 and 21 of two concatenated accumulate the pressure, the cylinder block and communicates with each cylinder bore, and with the rotation of the cylinder block, the opening slides the respective port on has in each cylinder bore each communicating hole 9-1a one of a communicatively 2 and each port, the 9-1b Te, done exclusively communicating with the communication hole and each port of 20, 21 each accumulator oil passage, the and accumulator recovery operation to recover in two steps into the cylinder bore in one pressure stored in pressure oil path and the accumulation operation is accumulated in the accumulator oil passage in two steps the pressure in the cylinder bores in one through the communication hole I do. Thus, it is possible to realize a pulsation suppression method of the hydraulic pump motor and the hydraulic pump motor can be a simple structure to suppress the pulsation.