| 摘要 |
A device is disclosed for pumping the tyre of a vehicle whilst the vehicle is travelling. The device is mounted on the wheel axle and, apart from a hanging counterweight (226) which remains stationary, the entire device rotates with the axle and wheels. Tyre pressure is sensed and, when below a predetermined level, a piston (22) moves axially to press a rotating clutch plate (260) against the stationary counterweight (226). The clutch plate (260) thus stops rotating. Part of a pump drive structure (216) stops rotating with the clutch plate (260). Relative rotation between this part of the pump drive structure and the remainder of the pump drive structure causes air to be pumped to the tyre. When tyre pressure has been restored the piston (22) moves back, the clutch plate (260) is released, and the pumping action ceases.
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