Transmission mechanism for rail oil transfer pump

A transmission mechanism for a rail oil transfer pump is independent of a transmission device outside a diesel engine body. An oil pump transmission shaft 10 is connected with an oil injection pump gear; power coming from meshing between a crankshaft gear 8 and an idle pulley 15 is transmitted to the transmission shaft 10 through the gear 9, and led into a gearbox assembly; the other end of the transmission shaft 10 is connected with an oil pump gear 1a; the gear 1a meshes with a gear 1b on a shaft of the oil transfer pump 20; the gears 1a and 1b are straight gears; bearings 6a and 6b, a coded disc 7 and a key 11 are mounted on the transmission shaft; one end surface of each of the bearings is used as an axial positioning surface of the coded disc; and a phase sensor 13 is mounted on a gearbox body 5. The utility model meets the technical requirements of the rail oil transfer pump for rotating direction, transmission ratio, zero axial force and measurement of phase signals with transmission ratio of 1: 2 to a crankshaft during the upgrading process of a diesel engine from a national II product to a national III product, and integrates all improvement designs into a whole, thereby keeping the commonality and the succession with the national II diesel engine to the maximum.