SPROCKET AND TRANSMISSION MECHANISM

原文（中国語）

Provided is a sprocket that mitigates the influence of tension fluctuation corresponding to load torque fluctuation, suppresses the occurrence of order noise corresponding to the cycle of the load torque fluctuation while suppressing noise and vibration, and prevents an increase in the tension fluctuation as well as an increase in the noise and vibration caused by resonance. A plurality of teeth meshing with a chain are arranged such that an adjacent angular phase θn of each of the plurality of the teeth is non-uniform. In a case where an angular phase obtained when all the teeth are arranged in a uniform angular phase is defined as θ (360°/the number of teeth), the adjacent angular phase θn of each of the teeth includes a site where θ+1.5°≥θn≥θ+0.1° and a site where θ−0.1°≥ θn≥θ−1.5°.