| 摘要 |
According to the present invention, a piston pump of a brake system for a vehicle comprises: a pump chamber; a piston unit which is accommodated in the pump chamber to be movable, and compresses oil in the pump chamber; a first elastic unit which is connected to one end of the piston unit and maintains or releases the airtightness inside the pump chamber by being elastically transformed; and a second elastic unit which is installed inside the first elastic unit and elastically transforms the first elastic unit by being compressed and expanded according to changes in the internal pressure of the pump chamber. Therefore, the piston pump can achieve the maintenance of airtightness in the pump chamber and a check valve function at the same time by an elastic member made of a metal board and a lip type elastic member. |
