A built-in battery device of an electric bicycle, including a seat post connected to a base, the base is connected to a saddle, and a battery pack is arranged in the seat post, and the cross section of the seat post is an curved surface with a narrow front end and a wide rear end; the battery pack is disposed in a stack, and on the cross section of the seat post, the number of built-in batteries in a single row at the rear end is more than that in a single row at the front end. The vertical spacing of the battery pack is provided with a connection bracket which is fixedly connected to the head and the tail of the multi-layer batteries. The electric bicycle has the advantages of reasonable space utilization, beautiful appearance, convenient assembly and small wind resistance.

A bicycle frame assembly includes a frame including a first segment, a second segment connected to the first segment at a first hinge, and a third segment connected to the second segment at a second hinge. A synchronization cable extends through the second segment from the first hinge to the second hinge.

A bicycle frame assembly includes a frame including a first segment, a second segment connected to the first segment at a first hinge, and a third segment connected to the second segment at a second hinge. A synchronization cable extends through the second segment from the first hinge to the second hinge.

A foldable bicycle is disclosed herein which can be unlocked to fold. It comprises a main frame having a first connecting rod and a second connecting rod, a first folding joint between the first connecting rod and the second connecting rod and having a first outer shell, a second outer shell, an engaging unit, an elastic member, a press button and a cam locking member, a front wheel rack connected to a front end of the first connecting rod, a front wheel connected to the front wheel rack, and a rear wheel connected to a rear end of the second connecting rod.

The invention relates to a bicycle, with a bicycle seat assembly rotatably connected to the bicycle. Rotation movement of the bicycle seat assembly is possible, seen in the driving direction, to the left and to the right side and is independent of the steering movement of the bicycle. The axis of rotation of the bicycle seat assembly is arranged in front of the axis of the bottom bracket, seen in the driving direction, and the seating surface of the bicycle seat is arranged behind the axis of the bottom bracket, seen in the driving direction. The rotatable bicycle seat assembly enables an upright riding position by dodging the cyclist's leg pedaling downwards through a rotational movement. At the same time it supports the hip side of the other leg. The driver is supported by the bicycle seat even in the upright riding position.

The invention relates to a bicycle, with a bicycle seat assembly rotatably connected to the bicycle. Rotation movement of the bicycle seat assembly is possible, seen in the driving direction, to the left and to the right side and is independent of the steering movement of the bicycle. The axis of rotation of the bicycle seat assembly is arranged in front of the axis of the bottom bracket, seen in the driving direction, and the seating surface of the bicycle seat is arranged behind the axis of the bottom bracket, seen in the driving direction. The rotatable bicycle seat assembly enables an upright riding position by dodging the cyclist's leg pedaling downwards through a rotational movement. At the same time it supports the hip side of the other leg. The driver is supported by the bicycle seat even in the upright riding position.

A folded bicycle frame comprising a single and continuous sheet of metal is disclosed. The bicycle frame is formed by cutting the sheet of metal to form a boundary, hydroforming the sheet of metal to create a profile comprising indentations and protrusions along the sheet of metal, and then folding the molded sheet essentially along its axis of symmetry, such that the symmetrical parts of the sheet are positioned next to each other to form the frame with a hollow interior. Holes are precut in the frame so that other bicycle parts may be attached to the frame. The frame is produced without the need for any welding or connecting of individual parts. Thus, it is stronger than conventional bicycle frames which are weaker at such welded connections of their parts. A method for making the folded frame is also disclosed.

A foldable bicycle is disclosed herein which can be unlocked to fold. It comprises a main frame having a first connecting rod and a second connecting rod, a first folding joint between the first connecting rod and the second connecting rod and having a first outer shell, a second outer shell, an engaging unit, an elastic member, a press button and a cam locking member, a front wheel rack connected to a front end of the first connecting rod, a front wheel connected to the front wheel rack, and a rear wheel connected to a rear end of the second connecting rod.

The present invention discloses an installation structure for a wheel axle assembly and a wheel fork, a frame and a vehicle. The wheel axle assembly includes a wheel axle; a first bearing, a bushing and a second wheel axle sleeved on the wheel axle successively; and a hub arranged on the outer rings of the first bearing and the second bearing, wherein the bushing is used for spacing apart the first bearing and the second bearing axially a predetermined distance, and the hub is of a sleeve shape and an end thereof arranged on the first bearing expands the outer diameter to form a flange portion for fixing and installing a wheel; and the wheel fork includes a wheel fork body and a frame connection portion formed on an end of the wheel fork body and forming an L shape with the wheel fork body for connecting to a frame, and the wheel axle is fixed on the other end of the wheel fork body in a direction perpendicular to the rim center plane of the wheel.

The present invention discloses an installation structure for a wheel axle assembly and a wheel fork, a frame and a vehicle. The wheel axle assembly includes a wheel axle; a first bearing, a bushing and a second wheel axle sleeved on the wheel axle successively; and a hub arranged on the outer rings of the first bearing and the second bearing, wherein the bushing is used for spacing apart the first bearing and the second bearing axially a predetermined distance, and the hub is of a sleeve shape and an end thereof arranged on the first bearing expands the outer diameter to form a flange portion for fixing and installing a wheel; and the wheel fork includes a wheel fork body and a frame connection portion formed on an end of the wheel fork body and forming an L shape with the wheel fork body for connecting to a frame, and the wheel axle is fixed on the other end of the wheel fork body in a direction perpendicular to the rim center plane of the wheel.