| 摘要 |
PURPOSE: A master cylinder is provided to reduce the production processes by improving the structure of a first supply path, to cut down the production cost by excluding the parts of a ball, and to prevent the leakage of the brake oil out of the master cylinder. CONSTITUTION: A master cylinder comprises a cylindrical cylinder(10) and a first and a second pistons(20,20') separately installed in the cylinder. The cylinder has a first supply path(40) communicating with a first compressing space(30) and a second supply path(40') communicating with a second compressing space(30'). According to the supply paths, the compressing spaces are filled with oil. The first supply path includes a first path(41) extending from a first connecting port(50) to the rear portion of the cylinder and a second path(42) formed between the first compressing space and the first path. The first path is formed by using a drill, and the inner diameter of the first path around the front end upper portion of the first piston is longer than the diameter of the front side. The second path is formed by punching the inner circumference of the cylinder.
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