CANCEL CAM

A cancel cam (40) comprises 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) which faces in an axial direction (D1) parallel to a 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 a circumferential direction (D2). The at least one reinforcing rib (43) couples the cam wall (42) to the annular member (41). The cam wall (42) has a first axial length (LI) 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 (LI).