| 摘要 |
A device for automatically maintaining the correct pressure within a vehicle tyre (2) comprises a reservoir (1) of compressed air, a pump (6) for supplying the compressed air, valve means (3) responsive to load on the tyre, which valve means delivers compressed air from the reservoir to the interior of the tyre (2) when higher pressure is required, and a bleed valve (5) or pump (6) in fluid connection with the interior of the tyre to release air from the tyre when a lower pressure is required, the bleed valve or pump being set to provide a predetermined minimum tyre pressure.
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