Driving wheel mechanism of bridge crane car girder

The utility model relates to a driving wheel mechanism of a bridge crane car girder, which comprises a driving source, a driving wheel, bearings and two support pieces; the driving source is provided with a power output gear, and the driving wheel is provided with an inner gear which is meshed with the power output gear for transmission; a pair of bearings are respectively arranged in circular grooves on the front end surface and the rear end surface of the driving wheel; the two support pieces comprise a first support piece and a second support piece which are respectively inserted on both sides of a shell body of the girder from outside to inside from two directions, and the ends thereof are embedded into the front circular groove and the rear circular groove of the driving wheel; the bearings are limited between the inner circular surface of the driving wheel and the outer circular surfaces of the support pieces; and in addition, a hole is arranged at the middle part of the second support piece for the power output gear to pass through. Compared with the prior art, the driving wheel mechanism of the bridge crane car girder has the advantages of shaft-less wheel assembly, simple structure, convenient installation, smaller installation size, and effective and reliable transmission.