# US 11,111,827 B2 · Double flapper valve for a variable cam timing system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,111,827 B2 - Document ID: US11111827B2 - Status: Granted - Kind: B2 - Application number: 16/573,186 - Filed: 2019-09-17 - Published: 2020-01-09 - Granted: 2021-09-07 - Earliest claimed: 2016-10-06 - Assignees: BorgWarner Inc. - Applicants: BorgWarner, Inc. - Inventors: Chris D. Thomas; Augusto Fanzani; Maino Bruno - Web page: https://patentgrep.com/patent/US11111827B2 ## CPC - F01L 1/3442: {using hydraulic chambers with variable volume to transmit the rotating force} - F16K 15/16: with tongue-shaped laminae - F16K 15/1848: {Check valves combined with valves having a rotating tap or cock} - F01L 2001/34426: {Oil control valves} - F01L 2001/3443: {Solenoid driven oil control valves} - F01L 2001/34433: {Location oil control valves} - F01L 2301/00: Using particular materials - F01L 2820/01: Absolute values - F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES - F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)} ## Abstract An inlet check valve for controlling fluid from a supply into a variable cam timing phaser includes a double flapper check valve assembly with an open position and a closed position, which includes a housing having a body, at least one stopper, a flapper valve comprising at least two flexible flaps received within the housing and aligned with the stopper(s), and a valve seat received within the housing, the valve seat defining openings aligned with the at least two flexible flaps, axially opposite the two stoppers. ## Claims ### Claim 1 A check valve for controlling fluid within or into a variable cam timing phaser, comprising: a double flapper check valve assembly with an open position and a closed position, the double flapper check valve comprising: a housing having a body forming at least one stopper; a flapper valve comprising at least two flexible flaps received within the housing and aligned with the stopper(s); and a valve seat received within the housing, the valve seat defining openings aligned with the at least two flexible flaps, axially opposite the stopper(s); wherein when fluid flows through the openings of the valve seat, the fluid pushes the at least two flaps away from the valve seat and towards the stopper(s), permitting the flow of fluid into the variably; cam timing phaser; and wherein when fluid flows from the body onto the at least two flaps, the fluid pushes the at least two flaps towards the valve seat, sealing the openings of the valve seat and preventing fluid from entering the supply. ### Claim 2 (depends on 1) The check valve of claim 1, wherein the stopper(s) is/are shaped to limit the movement of the at least two flexible flaps. ### Claim 3 (depends on 1) The check valve of claim 1, the housing further comprising a lip defining a protrusion for securing the valve seat and flapper valve to the housing. ### Claim 4 (depends on 1) The check valve of claim 1, wherein the housing is manufactured by an overmolding process. ### Claim 5 (depends on 1) The check valve of claim 1, wherein the double flapper check valve assembly further comprises a filter located adjacent to the valve seat. ### Claim 6 (depends on 1) The double flapper valve assembly of claim 1, further comprising a sleeve that contains a spool valve of the variable cam timing system, wherein the housing and the sleeve have holes that create passages for oil flow and are reversibly connectable. ### Claim 7 (depends on 6) The double flapper valve assembly of claim 6, wherein a top of the sleeve is shaped to receive the stopper(s) of the housing when the sleeve and the housing are connected. ### Claim 8 (depends on 1) The double flapper valve assembly of claim 1, wherein the double flapper valve assembly is located in a center bore of a rotor. ### Claim 9 (depends on 1) The double flapper valve assembly of claim 1, wherein a total passage of oil into the phaser is about 40 mm2. ### Claim 10 A check valve for controlling fluid within or into a variable cam timing phaser, comprising: a double flapper check valve assembly with an open position and a closed position, the double flapper check valve comprising: a housing having a body; a flapper valve comprising at least two flexible flaps received within the housing; a stopper aligned with the at least two flexible flaps; and a valve seat received within the housing, the valve seat defining openings aligned with the at least two flexible flaps, axially opposite the stopper; wherein when fluid flows through the openings of the valve seat, the fluid pushes the at least two flaps away from the valve seat and towards the stopper, permitting the flow of fluid into the variable cam timing phaser; and wherein when fluid flows from the body onto the at least two flaps, the fluid pushes the at least two flaps towards the valve seat, sealing the openings of the valve seat and preventing fluid from entering the supply. ### Claim 11 (depends on 10) The inlet check valve of claim 10, the housing further comprising a lip defining a protrusion for securing the valve seat, the flapper valve and the stopper piece to the housing. ### Claim 12 (depends on 10) The inlet check valve of claim 10, wherein the double flapper check valve assembly further comprises a filter located adjacent to the valve seat. ### Claim 13 (depends on 10) The inlet check valve of claim 10, further comprising a sleeve that contains a spool valve of the variable cam timing system, wherein the housing and the sleeve have holes that create passages for oil flow and are reversibly connectable. ### Claim 14 (depends on 13) The inlet check valve of claim 13, wherein each of the flapper valve, the stopper, the valve seat and the housing have holes opposite each other on an outer circumference, and the sleeve comprises two protrusions shaped to fit in the holes when the sleeve and the housing are assembled. ### Claim 15 (depends on 10) The double flapper valve assembly of claim 10, wherein the double flapper valve assembly is located in a center bore of a rotor.