Abstract: A hub motor includes an axle, a rotor, a stator, and a casing. The axle is fixed to a frame of a bicycle. The rotor is sleeved on the axle and pivots with the axle. The stator is fixed to the axle and adjacent to the rotor. The casing is sleeved on the axle and driven by the rotor to pivot with the axle. The casing has an accommodating space, a first perforation, and a second perforation. The accommodating space accommodates the stator and the rotor. The axle includes a first component and a second component. The first component is sleeved on the second component. The first component is arranged to pass through the first perforation. The second component is arranged to pass through the second perforation. The first component and the second component cannot rotate relative to each other after being sleeved.

Abstract: A hub motor includes an axle, a stator, a rotor, a casing, a sleeve, and a mounting seat. The axle has a first end, a second end, and a bump protruding out of a radial-outer-side surface of the axle. The bump is located on a side close to the second end in the extension direction. The stator is fixed to the axle and is close to the first end. The rotor is sleeved on the axle and pivots around the stator with the axle as an axis. The casing is sleeved on the axle, is driven by the rotor to pivot with the axle serving as an axis, and accommodates the stator and the rotor. The sleeve is rotatably sleeved on the second end of the axle and is connected to the casing. The mounting seat is connected to the axle and sleeved on the bump.

Abstract: A hub motor includes an axle, a stator, a rotor, a casing, a sleeve, and a mounting seat. The axle has a first end, a second end, and a bump protruding out of a radial-outer-side surface of the axle. The bump is located on a side close to the second end in the extension direction. The stator is fixed to the axle and is close to the first end. The rotor is sleeved on the axle and pivots around the stator with the axle as an axis. The casing is sleeved on the axle, is driven by the rotor to pivot with the axle serving as an axis, and accommodates the stator and the rotor. The sleeve is rotatably sleeved on the second end of the axle and is connected to the casing. The mounting seat is connected to the axle and sleeved on the bump.

Abstract: A hub motor includes an axle, a rotor, a stator, and a casing. The axle is fixed to a frame of a bicycle. The rotor is sleeved on the axle and pivots with the axle. The stator is fixed to the axle and adjacent to the rotor. The casing is sleeved on the axle and driven by the rotor to pivot with the axle. The casing has an accommodating space, a first perforation, and a second perforation. The accommodating space accommodates the stator and the rotor. The axle includes a first component and a second component. The first component is sleeved on the second component. The first component is arranged to pass through the first perforation. The second component is arranged to pass through the second perforation. The first component and the second component cannot rotate relative to each other after being sleeved.

Abstract: A transmission system of a decelerating mechanism includes a planetary gear unit including a sun gear being adjacent to the first surface and a planetary gear set and a holder including a carrier and several planetary shaft units rotatably disposed on the carrier. The carrier has a first surface and a second surface that face opposite directions. The planetary gear set has several first gears being adjacent to the first surface, respectively fitting around the planetary shaft units, and meshing with the sun gear, several second gears being adjacent to the second surface and being coaxially disposed with the first gears, and an internal gear ring meshing with the second gears. By respectively arranging the first gears and the second gears on two opposite sides of the carrier, mutual interference therebetween while turning could be avoided, and an overall volume of the transmission system could be reduced.

Abstract: A transmission system of a decelerating mechanism includes a planetary gear unit including a sun gear being adjacent to the first surface and a planetary gear set and a holder including a carrier and several planetary shaft units rotatably disposed on the carrier. The carrier has a first surface and a second surface that face opposite directions. The planetary gear set has several first gears being adjacent to the first surface, respectively fitting around the planetary shaft units, and meshing with the sun gear, several second gears being adjacent to the second surface and being coaxially disposed with the first gears, and an internal gear ring meshing with the second gears. By respectively arranging the first gears and the second gears on two opposite sides of the carrier, mutual interference therebetween while turning could be avoided, and an overall volume of the transmission system could be reduced.