0 a device like a wheel with one or more rows of tooth-like parts sticking out that keeps a chain moving on a bicycle or pulls film, paper, etc. through a machine -- 链轮；输片齿轮
This transmission system can be designed by using wires, sprocket chains, belts and timing belts or epicyclic gear trains.
The parallel type can be obtained using a wire, sprocket chain, belt or timing belt, while the cross type can be obtained by means of a wire or belt only.
Then, one can assume an equal pitch radii of wheels in order to ensure the maximum arc of contact between wire, sprocket chain, belt or timing belt and both wheels.
These were purchased during the war for fitting to the driving sprocket of tracked carriers.
It has a sprocket and a chain running through another driving sprocket.
By placing an extra sprocket and a little more reinforcement in the baler chamber we can make a bale weighing about 50 lb.
If the pedals and the cranks are taken off the chain and the sprockets on the wheel.
If one breaks a sprocket and the tank breaks down and if other units do not have appropriate spares, one will find that the tank is out of use.
