Automatic lubricating system for rim of internal combustion locomotive

The utility model discloses an internal combustion locomotive rim automatic lubrication system which comprises a high-pressure air source, a two-position three-way electromagnetic valve, an oil injection device, a limit switch and a time relay, the limit switch is installed on a traction rod seat of an internal combustion locomotive, and a trigger block corresponding to the limit switch is arranged on a locomotive body of the internal combustion locomotive. A control coil of the time relay is connected with a power source through a normally-open contact of the limiting switch, a control coil of the two-position three-way electromagnetic valve is connected with the power source through a delay disconnection normally-open contact of the time relay, a P port of the two-position three-way electromagnetic valve is communicated with a high-pressure air source, an R port of the two-position three-way electromagnetic valve is communicated with the atmosphere, and an A port of the two-position three-way electromagneti