Locking mechanism for gauge-variable bogie of high-speed electric multiple unit

A locking mechanism for a gauge-variable bogie of a high-speed electric multiple unit (EMU) comprises a locking rod, a working arm, a joint, a driving arm, a connecting rod, a spring, a lower stop block and an upper stop block, wherein the middle of the working arm is connected to the driving arm by the connecting rod; one end of the working arm is connected to a rotating arm hoop and the other end of the working arm is fixedly connected to the locking rod; the spring is mounted around the locking rod; and the upper end of the locking rod is inserted into an axle box body, an axle box rotatingarm beam and a locking keyway of the rotating arm hoop to realize locking. The locking mechanism for the gauge-variable bogie of the high-speed EMU locks a sliding device which is fixedly connected to the axle box body through the locking rod, so as to realize the function of unlocking and locking wheels by the gauge-variable bogie during the process of adjusting the inner distance of wheelsets.After unlocking the wheels