Support chain wheel

The utility model discloses a support chain wheel. The support chain wheel comprises a wheel shaft, a wheel body and a floating oil seal; one end of the wheel shaft is a working end, the other end of the wheel shaft is an installation end, the wheel body is installed at the working end of the wheel shaft through a shaft sleeve, a cover board and an outer side cover are arranged at the two ends of the wheel body respectively, an oil filler hole is formed in the cover board, the floating oil seal is arranged at the installation end in a sleeved mode and corresponds to the outer side cover in position, a transition sleeve is arranged between the wheel body and the floating oil seal, an annular convex ring is arranged at the position where the installation end and the working end are connected, and the annular convex ring is in fit with the floating oil seal. The transition sleeve is arranged between the wheel body and the floating oil seal to reduce the size of the floating oil seal, the linear speed generated when the floating oil seal rotates is decreased, and therefore the quantity of heat is reduced, losses are reduced, and the service life is prolonged; the annular convex ring is arranged at the position where the installation end and the working end are connected, so that matching between the working end and the installation end and matching between the installation end and the floating oil seal are tighter, and the mechanical intensity of the wheel shaft is improved.