Patent ID: 9702383
Date: 2017-07-11
CPC Classifications: B61F,F15B,F16F

Claim:
1. An actuator, comprising: a telescopic body having a cylinder; a piston inserted into the cylinder to be free to slide; a rod that is inserted into the cylinder and connected to the piston; a rod side chamber and a piston side chamber defined by the piston within the cylinder; a tank; a first opening/closing valve provided in a first passage that connects the rod side chamber to the piston side chamber; a second opening/closing valve provided in a second passage that connects the piston side chamber to the tank; a pump that supplies a working fluid to the rod side chamber; a supply passage via which the working fluid is supplied from the pump to the rod side chamber; a motor that drives the pump; an exhaust passage diverging from the supply passage so as to connect the rod side chamber to the tank; and a valve element provided in the exhaust passage, wherein a telescopic unit is formed by integrating the telescopic body, the first opening/closing valve, and the second opening/closing valve, a driving unit is formed by integrating the pump and the motor, the telescopic unit and the driving unit are provided as separate bodies, and the telescopic unit and the driving unit are mutually connected by (i) a first pipe forming a part of the supply passage and (ii) a second pipe forming a part of the second passage.