# US 11,441,633 B2 · Damper assembly including intake valve in fluid chamber > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,441,633 B2 - Document ID: US11441633B2 - Status: Granted - Kind: B2 - Application number: 16/994,129 - Filed: 2020-08-14 - Published: 2022-02-17 - Granted: 2022-09-13 - Earliest claimed: 2020-08-14 - Assignees: DRiV Automotive Inc. - Applicants: DRiV Automotive Inc. - Inventors: Stefan Deferme - Web page: https://patentgrep.com/patent/US11441633B2 ## CPC - F16F 9/5165: {by use of spherical valve elements or like free-moving bodies} - F16F 9/185: {Bitubular units (where compression of gas leads to a clear spring action F16F9/062)} - F16F 9/3271: {Assembly or repair} - F16F 9/346: Throttling passages in the form of slots arranged in cylinder walls - F16F 9/348: Throttling passages in the form of annular discs {or other plate-like elements which may or may not have a spring action}, operating in opposite directions {or singly, e.g. annular discs positioned on top of the valve or piston body (F16F9/341, F16F9/3415 take precedence)} - F16F 9/3485: {characterised by features of supporting elements intended to guide or limit the movement of the annular discs (F16F9/3488 takes precedence)} - F16F 9/3488: {characterised by features intended to affect valve bias or pre-stress} - F16F 9/369: {Sealings for elements other than pistons or piston rods, e.g. valves} - B60G 13/08: hydraulic - B60G 17/08: Characteristics of fluid dampers (adjusting fluid dampers in general F16F9/44 - F16F9/53) - B60G 2202/24: Fluid damper - B60G 2206/41: Dampers - B60G 2206/8201: by welding - B60G 2500/11: Damping valves - B60G 2800/162: Reducing road induced vibrations - F16F 9/065: {Expansion chamber provided on the upper or lower end of a damper, separately there from or laterally on the damper} - F16F 9/46: allowing control from a distance {, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall (attachment of valve units to cylinders F16F9/325)} - F16F 2222/12: Fluid damping - F16F 2226/048: Welding - F16F 2228/066: Variable stiffness - F16F 2230/20: Location of equilibration chamber - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION - B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00}) ## Abstract A damper assembly includes an outer tube and an inner tube disposed in the outer tube defining a fluid space therebetween. The inner tube defines an inner volume. A piston is slidably disposed in the inner tube and divides the inner volume into a rebound working chamber and a compression working chamber. An active rebound valve is fluidly connected to the rebound working chamber and the fluid chamber, and an active compression valve is fluidly connected to the reserve chamber and the compression working chamber. An intake assembly is positioned in the fluid chamber to control the fluid flow through the active rebound valve and into the compression working chamber during a rebound stroke and to control fluid flow from the compression working chamber through the active compression valve and into the rebound working chamber during a compression stroke. ## Claims ### Claim 1 A damper assembly, comprising: an outer tube; an inner tube disposed in the outer tube defining a fluid chamber between the outer tube and the inner tube, the inner tube defining an inner volume, the outer tube and inner tube having a common longitudinal axis; a piston slidably disposed in the inner tube along the common longitudinal axis, the piston dividing the inner volume of the inner tube into a rebound working chamber and a compression working chamber; and a rebound valve fluidly positioned external to the outer tube and fluidly connected to the rebound working chamber and the fluid chamber, the rebound valve having a variable flow resistance; a compression valve positioned external to the outer tube and fluidly connected to the fluid chamber and the compression working chamber, the compression valve having a variable flow resistance, the rebound valve and compression valve being separated by a gap along the common longitudinal axis; an intake assembly fastened within the fluid chamber at the gap between the rebound valve and the compression valve, the intake assembly in fluid communication with the rebound valve and the compression valve through an outer tube intake orifice and the intake assembly in fluid communication with the inner volume through an inner tube intake orifice, the intake assembly controlling flow between the rebound working chamber and the compression working chamber; wherein the intake assembly includes a rebound ring having at least one rebound orifice selectively obstructed during flow between the rebound working chamber and the compression working chamber by a bendable rebound disc; wherein the intake assembly includes a compression ring having at least one compression orifice selectively obstructed during flow between the rebound working chamber and the compression working chamber by a bendable compression disc; and wherein the rebound ring and bendable rebound disc, and the compression ring and bendable compression disc all include axially aligned fastening holes, and are fastened together in a mirrored fashion through the aligned fastening holes wherein the rebound ring and compression ring face one another. ### Claim 2 (depends on 1) The damper assembly of claim 1 further including at least one fulcrum spacer, the fulcrum spacer providing increased flow resistance to at least one of the bendable rebound disc and compression disc by increasing a bending force. ### Claim 3 (depends on 1) The damper assembly as in claim 1 wherein the rebound ring and the compression ring are fastened to the outer tube by one of a weld and an O-ring. ### Claim 4 (depends on 1) The damper assembly of claim 1 wherein the rebound ring includes a rebound tapered section proximate the rebound orifice and the compression ring including a compression tapered section proximate the compression orifice, the rebound tapered section facing the compression tapered section. ### Claim 5 (depends on 4) The damper assembly of claim 4 wherein at least one of the tapered sections are proximate the outer tube intake orifice. ### Claim 6 (depends on 4) The damper assembly of claim 4 wherein the rebound ring includes a rebound groove and the compression ring includes a compression groove, the rebound groove facing the compression groove and an O-ring sealingly positioned in the rebound and compression grooves. ### Claim 7 A damper assembly, comprising: an outer tube; an inner tube disposed in the outer tube defining a fluid chamber between the outer tube and the inner tube, the inner tube defining an inner volume, the outer tube and inner tube having a common longitudinal axis; a piston slidably disposed in the inner tube along the common longitudinal axis, the piston dividing the inner volume of the inner tube into a rebound working chamber and a compression working chamber; and a rebound valve fluidly positioned external to the outer tube and connected to the rebound working chamber and the fluid chamber, the rebound valve having a variable flow resistance; a compression valve fluidly positioned external to the outer tube and connected to the compression working chamber and the fluid chamber, the compression valve having a variable flow resistance; an intake assembly fastened within the fluid chamber to control flow between the rebound working chamber and the compression working chamber, the intake assembly including a rebound ring having a rebound orifice and a compression ring having a compression orifice, the rebound ring facing the compression ring, the rebound orifice obstructed by a bendable rebound disc and the compression orifice obstructed by a bendable compression disc; and a rebound fulcrum spacer and a compression fulcrum spacer that increase a flow resistance. ### Claim 8 (depends on 7) The damper assembly as in claim 7 wherein the rebound ring and compression ring, the rebound disc and compression disc are fastened together by a first and second fastener. ### Claim 9 (depends on 8) The damper assembly as in claim 8 wherein the first and second fastener are selected from the group consisting of rivets, bolts, and screws. ### Claim 10 (depends on 7) The damper assembly as in claim 7 wherein the intake assembly is positioned at a gap between the rebound valve and compression valve. ### Claim 11 (depends on 7) The damper assembly as in claim 7 wherein the rebound orifice and the compression orifice are arcuate in shape. ### Claim 12 (depends on 11) The damper assembly as in claim 11 wherein the rebound ring and the compression ring are identical in shape. ### Claim 13 (depends on 12) The damper assembly as in claim 12 further comprising at least one seal between the rebound orifice and the inner tube. ### Claim 14 (depends on 13) The damper assembly as in claim 13 further comprising a rebound fulcrum spacer and a compression fulcrum spacer, the rebound fulcrum spacer and compression fulcrum spacer acting to preload the rebound disc and the compression disc into a closed position over the rebound orifice and the compression orifice. ### Claim 15 (depends on 7) The damper assembly as in claim 7 wherein the rebound disc includes a tapered section proximate the rebound orifice, and the compression disc includes a tapered section proximate the compression orifice. ### Claim 16 (depends on 15) The damper assembly as in claim 15 wherein the rebound orifice faces the compression orifice.