Chain and leading wheel thereof

The utility model provides a chain and leading wheel thereof can lubricate the leading wheel under the condition about not dismantling, has improved operating efficiency, has reduced intensity of labour. The utility model discloses a leading wheel includes with its outer lane and chain complex bearing housing, the relative setting first bearing and second bearing in the bearing housing, and the axial runs through first bearing with the retaining member of second bearing, the retaining member is equipped with the radial hole and the axial hole of mutual intercommunication, radial hole with first bearing with second bearing intercommunication, the axial hole is equipped with the installation department for the filling piece of installation lubricating oil. The utility model discloses can realize the lubrication under the circumstances of not dismantling the leading wheel, lubricate after dismantling the leading wheel one by one, reduce intensity of labour, improve operating efficiency, avoid being particularly