Reset cam

The return cam (40) has an annular member (41), a cam wall (42), and at least one reinforcing rib (43). The annular member (41) includes an outer peripheral portion (44), an inner peripheral portion (45), and a first surface (46) facing an axial direction (D1) parallel to the rotation axis (A1). The cam wall (42) extends from the outer peripheral portion (44) in the axial direction (D1) and extends along the outer peripheral portion (44) in the circumferential direction (D2). At least one reinforcing rib (43) connects the cam wall (42) and the annular member (41). The cam wall (42) has a first axial length (L1) defined from the first surface (46) in the axial direction (D1). The inner peripheral portion (45) has a second axial length (L2) defined from the first surface (46) in the axial direction (D1). The second axial length (L2) is shorter than the first axial length (L1). 复位凸轮(40)具有环状部件(41)、凸轮壁(42)以及至少1个加强肋(43)。环状部件(41)包含外周部(44)、内周部(45)以及朝向与旋转轴线(A1)平行的轴向(D1)的第1面(46)。凸轮壁(42)从外周部(44)在轴向(D1)上延伸，并沿着外周部(44)在周向(