Bicycle pedal mandrel and bicycle pedal mandrel and crank set

The invention relates to a bicycle pedal mandrel, which is assembled in an assembling hole of a crank, and comprises a head part which is assembled in the assembling hole of the crank in a penetrating manner; a limiting part which is provided with an end surface facing an axial direction and facing the crank; a reinforcing part which is used for axially penetrating through the assembling hole, the reinforcing part is convexly arranged on the limiting part and is axially arranged between the head part and the limiting part, wherein the outer diameter of the reinforcing part is smaller than that of the end surface; and when the reinforcing part is arranged in the assembling hole, the reinforcing part radially supports and abuts against the crank when arranged in the assembling hole. The bicycle pedal mandrel has the advantages of high structural strength and low possibility of breakage. 本发明关于一种自行车踏板心轴，供组接于一曲柄的一组接孔，该自行车踏板心轴包括：一头部，其供穿组于该曲柄的该组接孔；一限位部，其设有一朝向一轴向及供朝向该曲柄的端面；及一强化部，其供轴向穿设该组接孔，该强化部凸设于该限位部且于该轴向上设于该头部及该限位部