DEVICE FOR CONTROLLING THE PRESSURE IN A VEHICLE TYRE

摘要

A device for Controlling pressure is disclosed which comprises a pump (28) having opposed pistons (30) which reciprocate in cylinders (40) carried by a casing (38). The pistons (30) are at the outer ends of rings (50) which are themselves fitted to an eccentric (26). The eccentric (28) is integral with a clutch plate (24). A second clutch plate (22) is fixed to a non-rotating axle (18) which itself forms part of a hanging counterweight structure (20). A piston (84) pushes the eccentric and clutch plate (26, 24) against the clutch plate (22) thereby to prevent the eccentric (26) tyre from rotating with the rings (50) upon a sensor detecting that a tyre has a low pressure in it. Stopping the eccentric initiates the pumping action of the pistons (30).

主权项

1. A device for controlling tyre pressure, the device comprising a casing structure which in use rotates with the wheel hub, a counterweight assembly which is mounted on the casing structure by way of a bearing so that the counterweight assembly hangs and does not rotate with the casing structure, a fixed axle forming part of the counterweight assembly, a first clutch plate, the first clutch plate being fixed to said axle, a second clutch plate, the second clutch plate, in the device's non-pumping condition, rotating with said casing structure, means for detecting tyre pressure, means for forcing said first and second clutch plates together to engage the clutch upon a tyre “under pressure” being detected so that said second clutch plate stops rotating, and an air pump which rotates with said casing structure and which includes an air pumping piston and a pump driving element for reciprocating said piston to pump air to the tyre only when said clutch is engaged, said element rotating with said casing structure whilst the clutch is disengaged.