Pressure damping device for brake system

A pressure damping device for a brake system, the pressure damping device being installed at the brake system having a hydraulic block provided with a first hydraulic circuit to control transfer of a fluid pressure generated by a first port of a master cylinder and a fluid pressure discharged from a first pump to at least one first wheel, and a second hydraulic circuit to control transfer of a fluid pressure generated by a second port of the master cylinder and a fluid pressure discharged from a second pump to at least one second wheel,

• wherein the hydraulic block includes a bore adapted connecting the master cylinder with a discharge outlet of each of the first and second pumps and formed between first and second main oil paths having an orifice to communicate with each of the first and second main oil paths, and a pressure damping unit provided in the bore and having a volume changed according to the fluid pressures discharged from the first and second pumps,
• wherein the pressure damping unit comprises:
• at least two damping members installed at one end of the bore, each of the damping members being provided with a concave portion having opposite sides grooved toward a center thereof;
• and
• a stopper member installed at the other end of the bore to seal the bore,
• wherein the damping members are elastically deformed, and an air damping space is formed between the damping members such that a volume of the air damping space changes according to the fluid pressures discharged from the first and second pumps,
• wherein a support plate to support the elastically deformed damping members is interposed between the damping members.