| 摘要 |
PROBLEM TO BE SOLVED: To restrain brake liquid from entering a cam chamber and the like.SOLUTION: The piston pump comprises: a cylinder 10 formed on a pump body 100; a piston 40 moving forward and backward in the cylinder 10; and a seal member 50 provided between the cylinder 10 and the piston 40, and blocking a pump chamber 30 formed at one end of the piston 40 and a cam chamber 130 formed at the other end of the pump chamber 30. The seal member 50 has a slide contact face 53 in slide and tight contact with the cylinder 10 or the piston 40, and is provided with a seal zone L1 sealed by the slide contact face 53 in a sliding direction of the piston 40. Length of the seal zone L1 is larger than stroke length of the piston 40. |
