Patent ID: 8317501
Filing Date: 2012-11-27
Classification: F04B,Y10T

Abstract:
1. A damper device comprising: a damper housing that has an opening at one end of the damper housing; an opening cover member that covers the opening and forms a fluid chamber in cooperation with the damper housing, wherein the fluid chamber is adapted to conduct fluid therethrough; a damper member that is placed in the fluid chamber and includes a first-side diaphragm and a second-side diaphragm, which are made of metal and are resiliently deformable, wherein a first-side outer peripheral portion of the first-side diaphragm and a second-side outer peripheral portion of the second-side diaphragm are joined with each other all around the first-side outer peripheral portion and the second-side outer peripheral portion to gas-tightly seal a damper chamber between a first-side concave portion of the first-side diaphragm and a second-side concave portion of the second-side diaphragm; a first-side cover member that is provided on one side of the first-side diaphragm, which is opposite from the second-side diaphragm, and includes a first-side outer peripheral portion and a first-side limiting portion, wherein the first-side outer peripheral portion of the first-side cover member is engaged with the first-side outer peripheral portion of the first-side diaphragm, the first-side limiting portion radially inwardly extends from the first-side outer peripheral portion of the first-side cover member, wherein the first-side limiting portion includes a plurality of arms, which radially inwardly extend from the first-side outer peripheral portion of the first-side cover member, and wherein a distal end of each of the plurality of arms of the first-side limiting portion is a free end that is bendable independently from the rest of the rest of the plurality of arms of the first-side limiting portion in a direction generally perpendicular to an imaginary plane, in which the first-side outer peripheral portion of the first-side cover member extends; a second-side cover member that is provided on one side of the second-side diaphragm, which is opposite from the first-side diaphragm, and includes a second-side outer peripheral portion and a second-side limiting portion, wherein the second-side outer peripheral portion of the second-side cover member is engaged with the second-side outer peripheral portion of the second-side diaphragm and cooperates with the first-side outer peripheral portion of the first-side cover member to clamp the first-side outer peripheral portion of the first-side diaphragm and the second-side outer peripheral portion of the second-side diaphragm between the first-side outer peripheral portion of the first-side cover member and the second-side outer peripheral portion of the second-side cover member and thereby to hold the first-side diaphragm and the second-side diaphragm on an inner side of the first-side cover member and the second-side cover member, and the second-side limiting portion radially inwardly extends from the second-side outer peripheral portion of the second-side cover member; a first-side support member that is configured into a generally tubular form and is placed between the first-side cover member and the opening cover member, wherein the first-side support member urges the first-side outer peripheral portion of the first-side cover member toward the first-side outer peripheral portion of the first-side diaphragm; and a second-side support member that is configured into a generally tubular form and is placed between the second-side cover member and the damper housing, wherein the second-side support member urges the second-side outer peripheral portion of the second-side cover member toward the second-side outer peripheral portion of the second-side diaphragm to clamp the first-side outer peripheral portion of the first-side cover member, the first-side outer peripheral portion of the first-side diaphragm, the second-side outer peripheral portion of the second-side diaphragm and the second-side outer peripheral portion of the second-side cover member between the first-side support member and the second-side support member, wherein: gas of a predetermined pressure, which is equal to or higher than an atmospheric pressure, is filled and sealed in the damper chamber of the damper member; and the first-side limiting portion and the second-side limiting portion are engageable with the first-side concave portion and the second-side concave portion, respectively, to limit bulging of the damper member when a pressure of the fluid chamber is equal to or less than the predetermined pressure.