Chain wheel

The utility model discloses a chain wheel which comprises a chain wheel body and a silencer, wherein at least fourteen transmission gears meshed with a chain are uniformly distributed on the periphery of the chain wheel body; the center of the end face of the chain wheel body is provided with a center mounting hole; the end face of the chain wheel body is provided with a ring-shaped groove; the ring-shaped groove is provided with a fixed hole; the end face of the chain wheel body is also provided with at least four lightening holes running through the end faces of two ends of the chain wheel body; the arc length of a first circular arc of each lightening hole is greater than that of a second circular arc of the lightening hole; the silencer comprises a mounting support for being connected with the chain wheel body and an elastic main body arranged on the mounting support; the elastic main body is suitable for buffering the chain which is in contact with the chain wheel; the elastic main body is provided with a protective cover or a protective coating. The chain wheel has a simple structure and a long service life.