Patent ID: 8366421

Claim:
A fluid pressure pulsation damper mechanism comprising: a metal damper having two metal diaphragms joined together with a hermetic seal for forming a sealed spacing filled with a gas between the two metal diaphragms, an edge part of the metal damper formed by the metal diaphragms, which are overlapped along outer peripheries thereof; a main body having a damper housing in which the metal damper is accommodated; and a cover attached to the main body to cover the damper housing and isolate the damper housing from outside air, the metal damper being held between the cover and the main body; wherein the cover further comprises a metal plate for making the cover, a peripheral edge of the cover being joined to the main body, the cover having a plurality of inner convex curved parts extending toward the main body, each inner convex curved part having a plurality of outer convex curved parts extending in different directions away from that inner convex curved part, the plurality of the inner convex curved parts being disposed circumferentially around the cover and inside the peripheral edge of the cover at which the cover is joined to the main body; ends of the plurality of inner convex curved parts touch one side of the edge part of the metal damper, which edge part is outwardly formed in radial directions of a part including the sealed spacing in the metal damper; the metal damper is held between the cover and a metal damper holding part of a holding member placed on the main body; and a spacing in the metal damper formed near the cover and another spacing in the metal damper formed near the main body communicate with each other through inside of the outer convex curved parts.