| 摘要 |
PURPOSE:To have a high efficiency braking at all times regardless of changing weight of the car, by making an incremental correction of the set load for a pressure regulator spring at the time of normal loading. CONSTITUTION:No.1 and No.2 flow lines L1 and L2 extending from the output side of a two-ganged master cylinder M are connected with the hydraulic operating part for front wheel brakes Bf, B'r and rear wheel brakes B'f, Br, and a brake oil pressure control device C is provided on the way of No.1 and No.2 flow lines L1 and L2 leading to the rear wheel brakes Br, B'r. A hydraulic extension device E, which can increase the effective length, is furnished at No.2 pressure receiving piston 92 in a brake oil pressure control device C, and a weight valve 25, which closes the oil line when an excessive car speed deceleration is sensed, is interposed in an oil line connecting the oil pressure actuating chamber 24 of this extension device E with No.1 or No.2 flow line L1 or L2. The pressure regulator spring S is formed by No.1 spring 11 always in service and No.2 spring 12 to be put in service by the action of the extension device E when No.2 pressure receiving piston 92 is extended exceeding a certain specified length. |
