| 摘要 |
A master cylinder of a brake is provided to smoothly provide brake oil and prevent a piston from being randomly shaken by forming a notch part at a front end of the piston and a projection at an outer surface of the front end of the piston. A master cylinder(120) of a brake comprises a cylinder body(121) communicating with an oil tank, a first piston(124), a second piston(125), a first return spring(126), a second return spring(127) and a plurality of notches formed at an end of the first piston. The cylinder body includes a first pressure chamber(122) and a second pressure chamber(123) that are divided by a partition. The first and second piston reciprocate in the first and the second pressure chamber, respectively. The first return spring and the second return spring elastically support the first piston and the second piston, respectively. A projection is formed at an outer surface of the end of the first piston.
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