摘要:
The invention relates to a purging device for an assembled unit for a vehicle, consisting of a wheel having a rim and a tyre. According to the invention, said purging device comprises a body connected to the inflation tube of the assembled unit, said body being designed to be subjected to the inflation pressure of the assembled unit, and a piston moving inside the body, said piston operating a valve, which is integral with the piston, between a closed position and a purging position for purging the body, said valve being normally closed, the valve and the piston each having a face designed to be exposed to the inflation air inside the body when in the closed position and the valve being opened by a control force applied to the piston. The invention also provides a method of deflating an assembled unit.
摘要:
Ce dispositif de mesure de la pression est du type purement mécanique et peut constituer l'élément d'un ensemble gonfleur-dégonfleur. Le circuit électrique mesurant la pression est fermé seulement lorsqu'à la fois cette pression atteint un seuil déterminé et qu'elle est sensiblement stable. Une jauge (2) se déforme sous l'action de la pression en entraînant la fermeture du circuit (18) et, lorsque le fluide est en mouvement, des moyens (5, 9) abaissent sous le seuil la pression en contact avec la jauge (2). Les moyens (5, 9) en question sont par exemple constitués d'un passage de section réduite disposée annulairement autour d'un cône de révolution (5).
摘要:
In the state where a tire valve cap body (12) has been fixedly screwed onto a valve mouthpiece, a top cover (14) is pushed to open a tire valve, allowing introduction of a tire air pressure. A piston (23) is slidably incorporated in a cylinder chamber (15D) defined within the top cover (14) and is urged by a return spring (26). Upon the introduction of the tire air pressure, the piston (23) is displaced to a position at which the biasing force of the return spring (26) balances with the force of the introduced air pressure. An indication mechanism is provided to indicate, through an indication window formed in a cylinder member, a position of the piston member (23) displaced by the tire air pressure introduced, thereby indicating a measurement value of the tire air pressure.
摘要:
A pressure relief device (100) for an inflatable tire comprises a body (102) having a chamber (116) therein and pressure relief mechanism for releasing air when the air pressure in the chamber exceeds a first predetermined pressure level. A conduit (108; 208) interconnects an air inlet (110; 210) with an air outlet (112; 212) . The conduit (108; 208) is provided in a pin (104; 204) arranged to slide axially in a passagway (106) in the body, the pin (104; 204) extending from the air inlet (110; 210) to the air outlet (112; 212) and being slidable between a first position in which it cannot release a stem of the tire, and a second position, in which it can release the stem.
摘要:
A tyre inflation pistol comprises a high pressure supply side (22), a passageway (28) leading to a pressure gauge, a passageway (26) leading to the tyre and a valve assembly. The valve assembly is arranged to close off the gauge passageway (28) when the tyre is being inflated to prevent damage to the gauge. The valve assembly comprises: a first valving element (14, 32) which controls air flow from the high pressure supply (22) to the tyre side (26); a second valving element (40, 42, 44, 46, 48) which slides in an axial hole (26) in the first valving element and acts to close off an aperture (54) leading to the pressure gauge; and an operating lever (18). Initially, the tyre side (26) of the valve is connected to the pressure gauge side (28) via an aperture (54). Operating the lever (18) moves the second valving element (42, 46) to close off the aperture (54). Further movement of the lever (18) pushes the head (48) of the second valving element against the first valving element (14) and opens the high pressure supply side (22) to the tyre side (26).