| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve the output of an electric fluid pressure actuator without using a large-capacity fluid pressure cylinder and a large-capacity electric motor. <P>SOLUTION: The electric fluid pressure actuator includes a hydraulic pump 1 driven by an electric motor 2; a hydraulic cylinder 10 with a rod 15 advanced/retreated by a hydraulic fluid from the hydraulic pump 1; and an accumulator 20 accumulating a part of the hydraulic fluid from the hydraulic pump 1. The hydraulic cylinder 10 includes a piston 11 to which the rod 15 is connected; a cylinder part 12 in which a piston side oil chamber 12a and a rod side oil chamber 12b to which the hydraulic fluid discharged in two ways from the hydraulic pump 1 is led, are partitioned by the piston 11; a piston 13 connected to the cylinder part 12; and a cylinder part 14 in which a back pressure chamber 14a for giving the piston 13 a thrust in a direction of retreating the rod 15 is partitioned. When the hydraulic fluid is led to the piston side oil chamber 12a from the hydraulic pump 1, the hydraulic fluid in the accumulator 20 is led to the back pressure chamber 14a based on the discharge pressure of the hydraulic pump 1. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
