Abstract: The present disclosure discloses a crank quick-connection structure. The crank quick-connection structure is used for connecting a crank with a main shaft, and includes an adapter and a connecting assembly. The adapter is connected to the main shaft, one end of the crank is provided with a cooperating cavity extending in a thickness direction thereof, and the adapter penetrates the cooperating cavity from one end of the cooperating cavity. The connecting assembly is connected to the adapter, and the connecting assembly has a locking position and a releasing position. In the locking position, the crank cooperates with the connecting assembly so that the cooperating cavity and the adapter are locked and connected; and in the releasing position, the crank is disengaged from the connecting assembly so that the crank can be disengaged from the adapter in an axial direction of the adapter.

Abstract: The present application relates to a synchronously driven brake, belonging to the field of vehicle brake devices. The synchronously driven brake includes a balancing frame configured to be connected with a brake cable and driven by the brake cable, wherein a pull cable is connected to the balancing frame and connected with two cable locking members, and configured to apply a same force to the two cable locking members; braking portions driven by the cable locking member to move and press against a wheel rim to decelerate the wheel rim are respectively connected to the cable locking members; and the synchronously driven brake further includes restoring portions applying to the braking portions a force enabling the braking portions to move away from the wheel rim.

Abstract: The present application relates to a saddle, in particular to a saddle with a water bottle. The saddle with the water bottle adopts the following technical solution: the saddle includes a saddle body and a water bottle body, the saddle body is provided with an accommodating cavity allowing the water bottle body to be inserted thereto, and the water bottle body is fixed in position relative to the saddle body after being inserted into the accommodating cavity. The space taken up by the water bottle placed between the saddle and the front wheel is saved.

Abstract: A brake lever, including a protective casing, a fixing assembly cooperatively fixing the protective casing, a connecting member for connecting a hand brake cable, and a hand brake assembly; the hand brake assembly includes a main arm with one end rotatably connected to the protective casing, and the other end rotatably connected to a handle; the main arm is driven to rotate by applying a force to the handle, the connecting member is driven by a transmission member to move in the direction of tightening the hand brake cable when the main arm rotates; the handle is provided with an auxiliary supporting arm, and two ends of the auxiliary supporting arm are rotatably connected to the protective casing and the handle.

Abstract: A quick-mount crank-pedal mechanism for a children bicycle is provided. The quick-mount crank-pedal mechanism is composed of a crank rod, a crank bearing and a pedal. The crank rod and the crank bearing are fitted with each other, and the pedal is coupled to the crank bearing. With the mechanism, the pedal is enabled to be in a usable state quickly without using any tools, and a tip of the crank is effectively protected from puncturing through a carton, thereby reducing potential safety hazards.