Transmission sprocket
A transmission sprocket is provided, including a sprocket body, an annular housing, and a chainring bump. The sprocket body is made of a first non-metallic material, and a radial outer edge of the sprocket body is provided with a plurality of chain teeth and a mounting hole. The annular housing is made of a second non-metallic material. The annular housing covers one side of the sprocket body and encloses an internal space together with the sprocket body, where the internal space surrounds an axis of the sprocket body. The chainring bump is disposed at the mounting hole. One of the sprocket body and the annular housing forms a rib in the internal space, the rib extends radially from the axis toward the chainring bump, and the rib abuts against the other of the sprocket body and the annular housing.
1 . A transmission sprocket, comprising:
a sprocket body, made of a first non-metallic material, wherein a radial outer edge of the sprocket body is provided with a plurality of chain teeth and at least one mounting hole;
an annular housing, made of a second non-metallic material, wherein the annular housing covers one side of the sprocket body and encloses an internal space together with the sprocket body, and the internal space surrounds an axis of the sprocket body; and
a chainring bump, disposed at the at least one mounting hole;
wherein one of the sprocket body and the annular housing forms a rib in the internal space, the rib extends radially from the axis toward the chainring bump, and the rib abuts against the other of the sprocket body and the annular housing.
2 . The transmission sprocket according to claim 1 , wherein the annular housing has a second disc wall opposite the sprocket body, and the second disc wall extends obliquely from a side close to the axis toward a direction away from the axis while gradually approaching the sprocket body.
3 . The transmission sprocket according to claim 2 , wherein the second disc wall has a stepped structure and comprises a plurality of first ring portions, and each first ring portion extends obliquely from the side close to the axis toward the direction away from the axis while gradually approaching the sprocket body.
4 . The transmission sprocket according to claim 3 , wherein the second disc wall further comprises at least one second ring portion, and the at least one second ring portion is connected between adjacent two of the first ring portions and non-parallel to the first ring portions.
5 . The transmission sprocket according to claim 3 , wherein one of the first ring portions is located at an outer edge of the annular housing.
6 . The transmission sprocket according to claim 1 , wherein an outer edge of the annular housing has at least one notch, and the chainring bump penetrates through the notch.
7 . The transmission sprocket according to claim 1 , wherein the ribs extends oppositely from the sprocket body and the annular housing and abut against each other.
8 . The transmission sprocket according to claim 1 , wherein the first non-metallic material and the second non-metallic material are a same material.
9 . The transmission sprocket according to claim 1 , wherein the first non-metallic material and the second non-metallic material are different materials.
10 . The transmission sprocket according to claim 1 , wherein the chainring bump is made of a non-metallic material.