Suspension damper with by-pass valves

Patent metadata

Field	Value
Publication number	US-9556925-B2
Application number	US-201313750336-A
Country	US
Kind code	B2
Filing date	Jan 25, 2013
Priority date	Jan 7, 2009
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A vehicle damper is described. The vehicle damper includes: a cylinder; a piston within the cylinder; a working fluid within the cylinder; a reservoir in fluid communication with the cylinder via the working fluid, the reservoir operable to receive the working fluid from the cylinder in a compression stroke; a valve in a flow path between the cylinder and the reservoir; and a remotely-operable valve having a position allowing the working fluid to significantly by-pass the valve.

First claim

What I claim is:

1. A vehicle damper comprising:
a cylinder;
a piston within said cylinder;
a working fluid within said cylinder;
a reservoir in fluid communication with said cylinder via said working fluid, said reservoir operable to receive said working fluid from said cylinder in a compression stroke;
a flow path starting in said cylinder and ending in said reservoir; and
a reservoir valve assembly disposed in said flow path, said reservoir valve assembly being configured for monitoring a flow of said working fluid into a reservoir fluid portion of said reservoir, wherein said reservoir valve assembly comprises at least a base valve, a remotely-operable valve, and a third reservoir valve that is not said base valve and said remotely operable valve, said third reservoir valve disposed in a first chamber, wherein said third reservoir valve is positioned upstream of said remotely operable valve during said compression stroke, wherein said base valve provides a positive damping resistance regardless of a compliant damping or a rigid damping pressure being applied separate from said positive damping resistance such that said flow of said working fluid through said base valve occurs under all circumstances, said remotely operable valve disposed in a second chamber adjacent said third reservoir valve, said remotely operable valve configured to control flow of said working fluid through said second chamber,
wherein said remotely-operable valve has an open position and a closed position, wherein said open position allows at least a portion of the whole of said working fluid to by-pass said third reservoir valve and move through said remotely-operable valve to said base valve.

2. The vehicle damper of claim 1 , wherein said piston comprises:
at least one flow path through which said working fluid meters from a first side of said piston to a second side of said piston.

3. The vehicle damper of claim 2 , further comprising:
at least one shim coupled with said at least one flow path, wherein said at least one shim at least partially obstructs said at least one flow path.

4. The vehicle damper of claim 3 , wherein said at least one flow path comprises:
a first flow path that is unrestricted, thereby allowing by-pass of said working fluid during said compression stroke.

5. The vehicle damper of claim 3 , wherein said at least one flow path comprises:
a second flow path that is restricted by said at least one shim, thereby allowing a damping of a flow of said working fluid during said compression stroke.

6. The vehicle damper of claim 1 , wherein said cylinder comprises:
a compression portion partially defined by a first side of said piston; and
a rebound chamber partially defined by a second side of said piston; and
a by-pass shut off valve positioned toward an end of said compression portion, wherein said by-pass shut off valve is biased away from said end of said compression portion by a spring, wherein during said compression stroke, said piston moves toward said by-pass shut off valve until a surface of said by-pass shut off valve abuts a radially outer portion of a leading surface facing said compression portion of said piston, at which point during said compression stroke, said surface of said by-pass shut off valve covers all ports located along an outer edge of said piston, wherein said working fluid remaining in said compression portion traverses said piston via ports located inward of said outer edge of said piston which are not covered by said by-pass shut off valve.

7. The vehicle damper of claim 6 , wherein said by-pass shut off valve is movable with said leading surface of said piston toward an end of said compression stroke.

8. The vehicle damper of claim 1 , further comprising:
a compression portion partially defined by a first side of said piston;
a rebound chamber partially defined by a second side of said piston, said rebound chamber comprising a rebound chamber therein configured to hold said working fluid;
a damper rod positioned within said cylinder, wherein a first end of said damper rod is coupled to said piston that is surrounding said damper rod and configured to move with said damper rod during said compression stroke or a rebound stroke;
a central flow path within said damper rod;
a first set of radially outward directed flow paths positioned within said damper rod and adjacent to said rebound chamber; and
a second set of radially outward directed flow paths positioned within said damper rod and adjacent to said piston, said second set of radially outward directed flow paths traverse shim valves before opening into a compression chamber of said compression portion, wherein during a rebound stroke, said working fluid within said rebound chamber flows into said first set of radially outward directed flow paths as said damper rod moves outward from said compression portion, moves into said central flow path, and then moves to said second set of radially outward directed flow paths.

9. The vehicle damper of claim 8 , further comprising:
a first sleeve having a diameter that is smaller than a diameter of said cylinder and being within said rebound chamber, an inner surface of said first sleeve surrounding a portion of an outer surface of said damper rod; and
a shut off valve positioned at a first end of said first sleeve, wherein upon said first set of radially outward directed flow paths being covered by said inner surface of said first sleeve at said shut off valve, flow of said working fluid there through is terminated.

10. The vehicle damper of claim 1 , wherein said reservoir comprises:
a reservoir fluid portion configured for filling with said working fluid during said compression stroke;
a floating piston; and
a gas portion positioned in between and coupled to said reservoir fluid portion and said floating piston, said gas portion being compressible as said reservoir fluid portion fills with said working fluid.

11. The vehicle damper of claim 10 , wherein said vehicle damper comprises:
a gas valve located at a lower end of said reservoir, said gas valve configured for adjusting a pressure of gas in said gas portion via introduction of compressed air through said gas valve.

12. The vehicle damper of claim 1 , wherein said reservoir valve assembly comprises:
a pathway leading from a fluid conduit into said reservoir fluid portion, wherein said fluid conduit houses said flow path between said cylinder and said reservoir.

13. The vehicle damper of claim 12 , wherein one of said base valve and said third reservoir valve comprises:
a first set of shims configured for providing a predetermined resistance to said flow of said working fluid passing into said reservoir during said compression stroke.

14. The vehicle damper of claim 13 , wherein the other one of said base valve and said third reservoir comprises:
a second set of shims configured for metering said flow of said working fluid out of said reservoir fluid portion during a rebound stroke of said vehicle damper.

15. The vehicle damper of claim 12 , further comprising:
a pressure intensifier damper arrangement positioned within said pathway, such that said remotely-operable valve is enabled to control a flow of said working fluid, thereby creating a damping effect, wherein said damping effect is additive to the results of a functioning of said reservoir valve assembly.

16. The vehicle damper of claim 1 , wherein said remotely-operable valve comprises:
a seat; and
a moveable plunger that is substantially sealable on said seat, wherein when said movable plunger is substantially sealed o

Assignees

• Fox Factory Inc

Inventors

• Marking John

Classifications

• F16F9/446

  Adjustment of valve bias or pre-stress (F16F9/443 takes precedence) · CPC title

• F16F9/065

  Expansion chamber provided on the upper or lower end of a damper, separately there from or laterally on the damper · CPC title

• F16F9/34

  Special valve constructions ({F16F9/44, F16F9/50 take precedence; filtering details F16F9/3285} ; valves in general F16K); Shape or construction of throttling passages · CPC title

• F16F9/466 Primary

  Throttling control, i.e. regulation of flow passage geometry (F16F9/464, F16F9/465 take precedence) · CPC title

• B60G2202/24

  Fluid damper · CPC title