Pulsation-damping member

A pulsation damping member which is disposed inside a housing chamber connected to a pipe of a fluid pressure system, the pulsation damping member comprising:

• a first metal plate and a second metal plate provided in an axial direction along a central axis, wherein
• the first metal plate and the second metal plate respectively include joint parts extending over the entire length in a circumferential direction around the central axis and joined to each other,
• an expansion/contraction space is provided between the first metal plate and the second metal plate in a portion positioned on an inner side with respect to the joint parts in a radial direction intersecting the central axis when viewed from the axial direction,
• the first metal plate and the second metal plate are configured to elastically deform in the axial direction while expanding and contracting the expansion/contraction space in the axial direction in accordance with pulsation of a fluid flowing through the pipe,
• a crest portion and a valley portion extending over the entire length in the circumferential direction are provided to line up in the radial direction in a portion positioned on an inner side with respect to the joint parts in the radial direction in each of the first metal plate and the second metal plate,
• the crest portion of the second metal plate is fitted within the crest portion of the first metal plate, and the valley portion of the first metal plate is fitted within the valley portion of the second metal plate,
• the expansion/contraction space includes an outer end portion positioned on an outermost side in the radial direction and continuous with the joint parts,
• a size in the axial direction of the outer end portion of the expansion/contraction space increases toward an inner side in the radial direction, the size in the axial direction of the expansion/contraction space being a distance in the axial direction between the first metal plate and the second metal plate,
• the expansion/contraction space includes an inner space which is a portion positioned on an inner side with respect to the outer end portion in the radial direction, and the inner space includes a first constricted portion positioned on a radially outward side from a center portion between the central axis and the joint parts in the radial direction,
• the first constricted portion is a portion of the inner space, which has a smallest size in the axial direction,
• the expansion/contraction space includes an intermediate portion positioned between the outer end portion and the first constricted portion, and
• a size in the axial direction of the intermediate portion of the expansion/contraction space decreases toward the inner side in the radial direction.