| 摘要 |
The body (1) fixed close to the hub of the wheel comprises a blind bore (2) in which a resilient housing (3) defines two chambers of variable volume. The free end of the housing comprises a magnet (5), the other end is fixed in a blind bore by a support (6) provided with a port (61). A shutter (8), actuated outside of the body by operating member (10), allows to enclose within the housing a reference pressure. The body (1) comprises a circular groove (102) which connects the blind bore with the inside of the tyre mounted on the rim A by a conduit E opening into said groove between two sealing joints (105). The operating member comprises a facing (16) on which is screwed the shutter (8) provided with a joint (7), provided with flat areas for letting air pass and a bore (15) in which is arranged a standard valve mechanism. A valve tube (13) allows to innate simultaneously the tyre and the housing; for operating the shutter, the tyre inflating pressure is enclosed in the housing.
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