| 摘要 |
<p>A pneumatic tyre has an internal emergency running tube which is inflated to a higher pressure than the tyre, rests on the wheel rim and, under normal running, has a smaller overall dia. than the tyre so that it does not touch it and the zenith. The reinforcement (tyre cord) in the emergency tube is oblique to the circumference so that the tube can expand radially until it reaches the inner dia. of the tyre.</p> |
