VIBRATION DAMPING DEVICE FOR RAILWAY VEHICLE

摘要

A vibration damping device for a railway vehicle comprises: an actuator having a cylinder which is connected to a bogie of the railway vehicle, a piston, a rod which is connected to both the piston and the vehicle body, a rod-side chamber and a piston-side chamber which are located within the cylinder, a first on-off valve for a first path which connects the rod-side chamber and the piston-side chamber, a second on-off valve for a second path which connects the piston-side chamber and a tank, and a pump which supplies hydraulic oil to the rod-side chamber; and a damper circuit for causing the actuator to function as a damper. The hydraulic oil has kinematic viscosity-temperature characteristics in which the kinematic viscosity of the hydraulic oil falls within the range from 7 mm2/s to 50 mm2/s when the temperature of the hydraulic oil is within the range from 20°C to 60°C.