| 摘要 |
1,165,436. Vehicle braking systems. ALFRED TEVES G.m.b.H. 5 Oct., 1967 [20 Jan., 1967], No. 45532/67. Heading F2F. A servo-braking system uses pressure liquid obtained from a pump in the vehicle (e.g. the lubricating oil pump or that of the automatic transmission) acting on a control piston within a bore in a booster piston which operates a third (master cylinder) piston, there being a slidable sleeve around the control piston which closes the connection between the pump and the booster piston when the brakes are released. In the Figure the brake pedal acts on a member 3 which drives a control piston 4 to move its face 25 away from the face 26 of a control sleeve 5 into the position shown. Liquid pressure from a pump 13 and reservoir 15 is then admitted into chamber 23 and drives a booster piston 1 to the left, flexing a diaphragm 9 against a spring 7. Movement of the booster piston 1 is transmitted through a semi-rigid member 8 to a rod 6 coupled to the piston 22 of a master cylinder 21. When the pedal is released, the faces 25 and 26 abut once more, and the liquid pressure acts on the other end 24 of the sleeve 5, which is larger than the face 25, to drive it to the right and disengage it from a seal 10. Pressure is then applied to the annular space between the sleeve 5 and control piston 4 and drives the latter back to its original position. |
