Double flapper valve for a variable cam timing system

Patent metadata

Field	Value
Publication number	US-11111827-B2
Application number	US-201916573186-A
Country	US
Kind code	B2
Filing date	Sep 17, 2019
Priority date	Oct 6, 2016
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

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.

First claim

What is claimed is:

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.

2. The check valve of claim 1 , wherein the stopper(s) is/are shaped to limit the movement of the at least two flexible flaps.

3. 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.

4. The check valve of claim 1 , wherein the housing is manufactured by an overmolding process.

5. The check valve of claim 1 , wherein the double flapper check valve assembly further comprises a filter located adjacent to the valve seat.

6. 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.

7. 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.

8. The double flapper valve assembly of claim 1 , wherein the double flapper valve assembly is located in a center bore of a rotor.

9. The double flapper valve assembly of claim 1 , wherein a total passage of oil into the phaser is about 40 mm 2 .

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.

11. 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.

12. The inlet check valve of claim 10 , wherein the double flapper check valve assembly further comprises a filter located adjacent to the valve seat.

13. 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.

14. 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.

15. The double flapper valve assembly of claim 10 , wherein the double flapper valve assembly is located in a center bore of a rotor.

Assignees

• Borgwarner Inc

Inventors

• Thomas Chris D
• Fanzani Augusto
• Bruno Maino

Classifications

• F01L2820/01

  Absolute values · CPC title

• F16K15/1848

  Check valves combined with valves having a rotating tap or cock · CPC title

• F16K15/16 Primary

  with tongue-shaped laminae · CPC title

• F01L2001/3443

  Solenoid driven oil control valves · CPC title

• F01L1/3442 Primary

  using hydraulic chambers with variable volume to transmit the rotating force · CPC title