| 摘要 |
<p>1. Hydraulic pressure generator of the type comprising a housing (12) provided with a cavity (14) wich slidably receives a piston (20) capable of cooperating with an annular sealing ring (26) mounted fixedly with respect to said housing so as to divide said cavity into a pressure chamber (28) and a low pressure supply chamber (32), said ring presenting a radial section substantially in the shape of a U open towards the pressure chamber and presenting an inner arm (44) and a peripheral arm (46), said peripheral arm co-coperating sealingly with the wall (50) of said cavity and said inner arm being able to cooperate sealingly with the outer surface (48) of the piston, characterized in that said peripheral arm (46) consists of a lip, capable of being disengaged, by turning, from the inner wall (50) of the cavity when the pressure prevailing in the pressure chamber (28) is less than that prevailing in the supply chamber (32), said lip being located in a branch passage connecting the afore-mentioned chambers.</p> |
