| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an actuator for an assist bogie angle steering truck, the actuator capable of suppressing an increase in turning resistance when control fails by using a spool valve for hydraulic circuit control. <P>SOLUTION: The actuator for the assist bogie angle steering truck is configured such that both ends thereof are attached to a steering beam and a truck frame, respectively. The actuator for the assist bogie angle steering truck is integrally provided with a hydraulic circuit 1 with a spool valve 6 for hydraulic circuit control incorporated therein and a pump 2 for driving the hydraulic circuit 1. The spool valve 6 for hydraulic circuit control shuts off the hydraulic circuit 1 to a cylinder constituting a part of the actuator when operation fails wherein the pump 2 supplies hydraulic fluid in a direction to obstruct operation of the actuator, and returns the hydraulic fluid to a tank, thereby suppressing an increase in turning resistance. <P>COPYRIGHT: (C)2013,JPO&INPIT |
