| 摘要 |
The present invention provides a two wheel vehicle structure, including: a vehicle frame and a multi-ratio transmission system. The vehicle frame has two wheels and an input tubular member. A crank is attached at each end of the input tubular member. The multi-ratio transmission system includes: a multi-ratio transmission device, a first sprocket, a second sprocket and a chain. The multi-ratio transmission device is installed inside the input tubular member and located at a rotation center of the cranks. The second sprocket is coaxially installed on a wheel axle of a driving wheel. The chain is engaged with the first sprocket and the second sprocket. When the cranks rotate, the rotation motion of the cranks are transmitted to the first sprocket through the multi-ratio transmission device, subsequently, the motion is transmitted to the second sprocket from the first sprocket through the chain, thereby propelling the driving wheel to rotate. |
| 主权项 |
1. A two-wheel vehicle structure, comprising:
a vehicle frame equipped with a handle and two wheels, wherein at least one of the wheels is a driving wheel, the vehicle frame comprising:
an input tubular member, wherein a crank is attached at each end of the input tubular member, and a pedal is attached on each said crank; and a multi-ratio transmission system, comprising:
a multi-ratio transmission device having a first sprocket, installed inside the input tubular member and located at a rotation center of the cranks, wherein the first sprocket is located at an outer side of the input tubular member and is located between the input tubular member and one of the cranks, wherein the multi-ratio transmission device is connected to a shift lever, which is installed on the handle, with a shift cable;a second sprocket coaxially installed on a wheel axle of the driving wheel, and located on a same side of the vehicle frame with the first sprocket; anda chain winded around and engaged with the first sprocket and the second sprocket; wherein when the cranks rotate, the rotation motion of the cranks are transmitted to the first sprocket through the multi-ratio transmission device, subsequently, the motion is transmitted to the second sprocket from the first sprocket through the chain, thereby propelling the driving wheel to rotate. |
