JP2011163386A5 - - Google Patents

Description

The servo valve 250 includes a servo valve sleeve 252, and Rusa turbo valve spool 254 housed inside the servo valve sleeve 252, a force motor 256 relatively moving drive the servo valve spool 254 relative to the servo valve sleeve 252 A force motor drive sleeve / spool mechanism including a restoring spring 258 that pulls the servo valve spool 254 back to a neutral position relative to the servo valve sleeve 252.

In some cases, even in the neutral state, the communication amount between the first opening and the second opening may be a predetermined amount of communication that is predetermined. Specifically, the central land 52 central opening 42 is a second opening without completely blocked, or as to open the second opening with a predetermined allowance gap in part batchwise. In this way, the central land 52 to open the second opening partially, between the first opening and the second opening, can perform a communication suitable amount of gas. Thereby, the operation of the variable aperture device 10 can be made more stable. Conversely, an overlap of the swing spool 50 is provided on both sides of the central opening 42, and even if the swing spool 50 moves in the neutral state and the overlap range, the first opening and the second opening are not It is possible to prevent communication. Below, description is continued about the case where the communication amount between a 1st opening part and a 2nd opening part is zero in a neutral state.

The operation of the above configuration will be described in detail with reference to FIGS. Figure 4 is a diagram showing a state of the gas flow path when utilizing the gas pressure cylinder 230 as an actuator, FIG. 5, the gas stream when using a gas pressure cylinder 230 as a damper with a variable throttle device 10 It is a figure which shows the state of a road.

The state in FIG. 5 is when the railway vehicle 200 that performs pendulum control enters an abnormal state. At this time, the gas pressure cylinder 230 is used as having a damper function. That is, when the controller 310 determines that this abnormal state has occurred, the two introduction valves 280 and 282 are closed by the function of the switching control processing unit 314 of the controller 310, and the two communication valves 284 and 286 are closed. Is opened. As a result, the servo valve 250 is disconnected from the gas pressure cylinder 230, and the gas pressure cylinder 230 is connected to the variable throttle device 10.

By connecting the input ports 28 and 30 of the variable throttle device 10 to the supply ports 242 and 244 of the gas pressure cylinder 230, respectively, it can be used as a damper function as a whole. That is, in the configuration described with reference to FIG. 5, when the pendulum control does not work, and when relative movement occurs between the pendulum beam 206 and the carriage 204, the gas pressure cylinder 230 and the variable throttle device 10 have a damper function as a whole. This produces a reaction force F corresponding to the relative speed V = dX / dt between the pendulum beam 206 and the carriage 204.