| 摘要 |
The invention relates to a brake regulator which may be inserted between a hydraulic pressure source and a motor vehicle brake circuit, of the type comprising a casing (1) provided with a bore (5), a piston sliding in the bore (5) and delimiting therein an inlet chamber (7) and an outlet chamber (8) respectively connected to a pressure source and to the brake circuit, the chambers (7, 8) communicating with each other by means of a passage (14, 15, 16) made in the piston, a valve (17) being mounted in the passage (14) and stressed elastically to bear in a leaktight fashion against a seat (20) formed on the piston, the piston being stressed towards the bottom of the outlet chamber (8) in a rest position for which the valve (17) is moved away from its seat (20) by a needle (23) stressed in the opposite direction by a prestressed spring (25) bearing on the bottom of the outlet chamber (8). According to the invention, the piston is produced in two parts (28, 26), the first part (28) sliding in the bore (5) of the casing (1) and the second part (26) sliding in a blind bore (27) made in the first part (28) and comprising the passage (14) and the seat (20), the second part (26) being elastically stressed at rest into abutment against the first part (28), the inlet chamber (7) communicating with a chamber (30) made between the blind part of the bore (27) of the first part (28) and the second part (26), so that the volume of the said outlet chamber (8) remains substantially constant when the pressure in the inlet chamber (7) exceeds a predetermined threshold. <IMAGE>
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