Abstract: An electric bicycle frame includes a seat tube, a down tube, a top tube, a battery box, and a battery body. The seat tube includes an upper portion and a lower portion. The down tube includes a first end and a second end. The second end is connected to the lower portion. The top tube includes a third end, an expanding tube, and a fourth end. The fourth end is connected to the upper portion. The expanding tube is between the third end and fourth end. The expanding tube includes a tube diameter varying portion and a top opening. The tube diameter varying portion includes continuously varying cross-sections. The battery box is assembled inside the top opening of the expanding tube. The battery body is received in the battery box.

Abstract: A two stage quick-release structure includes a first tubing member, a second tubing member, a first pivoting portion, a first buckling portion, an elastic hook and a safety fastener. When the user assembles the foldable bicycle for bicycling, the first tubing member is rotated to connect with the second tubing member via the first pivoting portion, so that the elastic hook correspondingly buckles with the first buckling portion to form a first stage buckle; then, the safety fastener is rotated to correspondingly buckle with the elastic hook so as to form a second stage buckle. The two stage buckle contributes the assembling of the foldable bicycle with ease and convenience. Furthermore, via the two stage buckle structures, the connection between the front bicycle frame body and the rear bicycle frame body are tightly secured.

Abstract: A combination structure of bicycle frame and motor hub includes a bicycle frame, a motor hub, and an elongated axle. One can extend, from one side of the bicycle frame, the elongated axle through a through hole of the bicycle frame and the motor hub, and then with one hand, a tail end of the elongated axle can be fastened into an internal thread hole of the bicycle frame. This will facilitate assembly of the components of the motor hub and the bicycle frame. Besides, when screwing or unscrewing the elongated axle, since the elongated axle has passed through the through hole and the internal thread hole opposing each other at the bicycle frame, the motor hub will not fall accidentally, and convenience can be assured for maintenance staff during proceeding of maintenance work.

Abstract: A two stage quick-release structure includes a first tubing member, a second tubing member, a first pivoting portion, a first buckling portion, an elastic hook and a safety fastener. When the user assembles the foldable bicycle for bicycling, the first tubing member is rotated to connect with the second tubing member via the first pivoting portion, so that the elastic hook correspondingly buckles with the first buckling portion to form a first stage buckle; then, the safety fastener is rotated to correspondingly buckle with the elastic hook so as to form a second stage buckle. The two stage buckle contributes the assembling of the foldable bicycle with ease and convenience. Furthermore, via the two stage buckle structures, the connection between the front bicycle frame body and the rear bicycle frame body are tightly secured.

Abstract: The invention relates to a battery holder which is configured to be inserted into the tube opening in the seat tube of the frame of an electric bicycle and to be pulled out. The bicycle saddle is connected to the battery holder via a saddle pillar.

Abstract: A combination structure of bicycle frame and motor hub includes a bicycle frame, a motor hub, and an elongated axle. One can extend, from one side of the bicycle frame, the elongated axle through a through hole of the bicycle frame and the motor hub, and then with one hand, a tail end of the elongated axle can be fastened into an internal thread hole of the bicycle frame. This will facilitate assembly of the components of the motor hub and the bicycle frame. Besides, when screwing or unscrewing the elongated axle, since the elongated axle has passed through the through hole and the internal thread hole opposing each other at the bicycle frame, the motor hub will not fall accidentally, and convenience can be assured for maintenance staff during proceeding of maintenance work.

Abstract: An automatic transmission for an electric vehicle hub includes an external motor rotor fixedly connected with a motor shaft; a sun gear; at least three first planet gears; and at least three second planet gears coaxially fixed with the corresponding first planet gears and which are engaged with the sun gear. The first and the second planet gears are respectively engaged with first and second internal gears, and the second internal gear has a diameter greater than that of the first internal gear. The rotating disk is arranged between the first internal gear and the second internal gear, and a hub is fixed to exterior of the rotating disk. The automatic transmission further includes a clutch device, making the rotating disk and the first internal gear contact with each other for a transmission of slower rpm, and when the rpm reaches critical, at a high-speed rotation.

Abstract: The invention relates to a battery holder which is configured to be inserted into the tube opening in the seat tube of the frame of an electric bicycle and to be pulled out. The bicycle saddle is connected to the battery holder via a saddle pillar.

Abstract: An automatic transmission for an electric vehicle hub includes an external motor rotor fixedly connected with a motor shaft; a sun gear; at least three primary planet gears which are engaged with the sun gear; and at least three secondary planet gears coaxially fixed with the primary planet gears. The primary and the secondary planet gears are engaged with a primary and a secondary internal gears, and the secondary internal gear has a diameter greater than that of the primary internal gear. The rotating disk is arranged between the primary internal gear and the secondary internal gear, and a hub is fixed to exterior of the rotating disk. The automatic transmission further includes a clutch device, making the rotating disk and the primary internal gear contact with each other for a transmission of slower rpm, and when the rpm reaches critical, at a high-speed rotation.

Abstract: A front fork having a suspension system disposed thereto includes an inner tube extending from a crown portion of the front fork, an outer tube slidably mounted to the inner tube, a ring member threadedly connected to the outer tube, a nut member threadedly connected to the inner tube and a spring mounted to the inner tube between the ring member and the nut member. The inner tube has a middle member and a first block respectively fixedly connected therein and the outer tube has a second block fixedly connected therein, a polygonal rod extending through a polygonal hole in the middle member and fixedly connected between the first block and the second block.