# US 10,480,704 B2 · Pulsation damper > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,704 B2 - Document ID: US10480704B2 - Status: Granted - Kind: B2 - Application number: 15/576,713 - Filed: 2016-05-11 - Published: 2018-10-25 - Granted: 2019-11-19 - Earliest claimed: 2015-05-27 - Assignees: Fujikoki Corporation; Denso Corporation - Applicants: Fujikoki Corporation; Denso Corporation - Inventors: Shin Yoshida; Takao Okada; Makoto Sudo; Osamu Hishinuma; Hiroatsu Yamada - Web page: https://patentgrep.com/patent/US10480704B2 ## CPC - F16L 55/053: the gas in the reservoir being separated from the fluid in the pipe - F02M 37/0041: {Means for damping pressure pulsations (equalisation of pulses in positive displacement pumps F04B1/00; devices for damping fluid pulsations in pipes F16L55/04)} - F02M 51/00: Fuel-injection apparatus characterised by being operated electrically - F02M 55/00: Fuel-injection apparatus characterised by their fuel conduits or their venting means; {Arrangements of conduits between fuel tank and pump F02M37/00 (venting in general B01D19/00)} - F02M 55/04: Means for damping vibrations {or pressure fluctuations} in injection pump inlets {or outlets} - F02M 59/26: caused by movements of pistons relative to their cylinders - F02M 59/36: by variably-timed valves controlling fuel passages {to pumping elements or overflow passages} - F02M 59/44: Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; {Pumps having transducers, e.g. to measure displacement of pump rack or piston} - F02M 59/447: {means specially adapted to limit fuel delivery or to supply excess of fuel temporarily, e.g. for starting of the engine (combined with fuel pump regulating devices F02D)} - F02M 59/46: Valves - F16J 3/02: Diaphragms - F02M 2200/315: for damping fuel pressure fluctuations - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS ## Abstract A pulsation damper includes an upper diaphragm, a lower diaphragm configured to form a sealed space having a predetermined pressure with the upper diaphragm, in which an inert gas is filled; and a deformation suppressing member formed of an elastic material, and comprising an inner cylindrical portion, and an extension portion extending from a center portion on an outer peripheral surface of the inner cylindrical portion such that the extension portion extends outward from a center axis of the inner cylindrical portion, wherein the deformation suppressing member is arranged inside the sealed space such that an outer periphery of the extension portion abuts against inner walls of the upper diaphragm and the lower diaphragm. ## Claims ### Claim 1 A pulsation damper comprising: an upper diaphragm; a lower diaphragm configured to form a sealed space having a predetermined pressure with the upper diaphragm, in which an inert gas is filled; and a deformation suppressing member formed of an elastic material, and comprising an annular ring having a radially inner surface and a radially outer surface, and an extension portion extending from a center portion of the radially outer surface of the annular ring such that the extension portion extends radially outward from a center axis of the annular ring, wherein the deformation suppressing member is arranged inside the sealed space such that a radially outer portion of the extension portion abuts against inner walls of the upper diaphragm and the lower diaphragm, and wherein on a radially outer peripheral portion of the extension portion is formed a first passage that communicates a first space surrounded by a radially outer peripheral surface of the extension portion, the upper diaphragm and the lower diaphragm, with a second space on an upper-diaphragm side of the extension portion and a third space on a lower-diaphragm side of the extension portion. ### Claim 2 (depends on 1) The pulsation damper according to claim 1, wherein the radially outer portion of the extension portion of the deformation suppressing member comprises an outer cylindrical portion protruding in a center axis direction of the pulsation damper, and an upper side and a lower side of the outer cylindrical portion abut against the inner walls of the upper diaphragm and the lower diaphragm. ### Claim 3 (depends on 1) The pulsation damper according to claim 1, wherein in a non-loaded condition, the annular ring forms a predetermined clearance between at least either the upper diaphragm or the lower diaphragm. ### Claim 4 (depends on 1) The pulsation damper according to claim 1, wherein a second passage communicating an inner side with an outer side of the annular ring is formed on at least either an upper-diaphragm side or a lower-diaphragm side of the annular ring. ### Claim 5 (depends on 1) The pulsation damper according to claim 1, wherein an intermediate cylindrical portion protruding in a center axis direction of the deformation suppressing member is further provided on the extension portion. ### Claim 6 (depends on 5) The pulsation damper according to claim 5, wherein the extension portion has a plurality of the intermediate cylindrical portions formed at a predetermined interval. ### Claim 7 (depends on 1) The pulsation damper according to claim 1, wherein if a pressure applied to an outer surface and a pressure applied to an inner surface are the same, a center portion of at least either the upper diaphragm or the lower diaphragm is formed to protrude outward. ### Claim 8 (depends on 1) The pulsation damper according to claim 1, wherein the pulsation damper further comprises an upper cover and a lower cover configured to interpose the upper diaphragm and the lower diaphragm. ### Claim 9 (depends on 1) The pulsation damper according to claim 1, wherein the extension portion comprises a hole or a notch communicating the upper-diaphragm side with the lower-diaphragm side. ### Claim 10 A pulsation damper comprising: an upper diaphragm; a lower diaphragm configured to form a sealed space having a predetermined pressure with the upper diaphragm, in which an inert gas is filled; and a deformation suppressing member formed of an elastic material, and comprising an inner cylindrical portion, and an extension portion extending from a center portion on an outer peripheral surface of the inner cylindrical portion such that the extension portion extends outward from a center axis of the inner cylindrical portion, wherein the deformation suppressing member is arranged inside the sealed space such that an outer periphery of the extension portion abuts against inner walls of the upper diaphragm and the lower diaphragm, wherein on an outer peripheral portion of the extension portion is formed a first passage that communicates a first space surrounded by an outer peripheral surface of the extension portion, the upper diaphragm and the lower diaphragm, with a second space on an upper-diaphragm side of the extension portion and a third space on a lower-diaphragm side of the extension portion, and wherein at least either a contact portion of the outer peripheral portion of the extension portion with the upper diaphragm or a contact portion of the outer peripheral portion of the extension portion with the lower diaphragm is formed of a curved surface. ### Claim 11 (depends on 10) The pulsation damper according to claim 10, wherein a radius of curvature of the curved surface is equal to either a radius of curvature of an inner wall of the upper diaphragm in contact with the curved surface or a radius of curvature of an inner wall of the lower diaphragm in contact with the curved surface. ### Claim 12 A pulsation damper comprising: a diaphragm; a plate-like member configured to form a sealed space having a predetermined pressure with the diaphragm, in which an inert gas is filled; and a deformation suppressing member formed of an elastic material, and comprising an inner cylindrical portion, and an extension portion extending from a center portion on an outer peripheral surface of the inner cylindrical portion such that the extension portion extends outward from a center axis of the inner cylindrical portion, wherein the deformation suppressing member is arranged inside the sealed space such that the deformation suppressing member abuts against inner walls of the diaphragm and the plate-like member, and wherein a second passage communicating an inner side with an outer side of the inner cylindrical portion is formed on at least either a diaphragm side or a plate-like member side of the inner cylindrical portion.