| 摘要 |
A differential master cylinder includes a hollow primary piston (12) and a hollow secondary piston (13) with different diameters, which are open at least at one end and are mutually associated in telescopic manner so that the primary piston (12) slides on the secondary piston (13), which is stationary, and so that their internal cavities communicate with each other to form a single chamber (15) connected to a user device. The pistons (12, 13) also define, with internal surfaces of a bore (11) housing both pistons, at least one external annular chamber (16) cooperating with the internal chamber during an initial phase of the operation. The invention also relates to a braking system for a motor vehicle comprising the differential master cylinder and to a method of driving a user device with fluid under pressure by means of the cylinder. |
