Compression piston

Patent metadata

Field	Value
Publication number	US-11066123-B2
Application number	US-201916522433-A
Country	US
Kind code	B2
Filing date	Jul 25, 2019
Priority date	Jun 26, 2015
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

A compression damper of a shock absorber includes: a single adjustable fluid circuit configured for controlling a damping rate associated with multiple compression speeds of the shock absorber, wherein the single adjustable fluid circuit includes a fluid passageway through a base valve; and a positionally adjustable floating shim stack positioned at one end of the fluid passageway, the positionally adjustable floating shim stack configured for selectively blocking a flow of fluid through the fluid passageway.

First claim

What we claim is:

1. A shock absorber, said shock absorber comprising:
a fluid filled chamber;
a main piston slidably disposed within said fluid filled chamber;
a rod coupled to said main piston, said rod having a portion thereof exposed to an oil bath when not disposed within said fluid filled chamber;
a compression damper disposed within said fluid filled chamber, said compression damper physically separated from said main piston and not connected to said rod, said compression damper comprising:
a compression piston;
an internal floating piston; and
a single adjustable fluid circuit configured for controlling a damping rate associated with multiple compression speeds of said shock absorber, wherein said single adjustable fluid circuit comprises:
a fluid passageway through said compression piston; and
a positionally adjustable floating shim stack positioned at one end of said fluid passageway, said positionally adjustable floating shim stack configured for selectively blocking a flow of fluid through said fluid passageway; and

a leak path configured for, upon compression, enabling oil to leak from said fluid filled chamber of said compression damper to a position exterior to said fluid filled chamber, wherein said leak path is part of a recirculation system of said shock absorber, said leak path comprising:
a recess in a shaft of said compression damper, wherein during said compression an independent floating piston is pushed upwards along said shaft by said flow of said oil until reaching said recess, at which point said oil leaks through a gap between a surface of said recess and said independent floating piston, wherein said recess comprises:
a curvature at one side configured for guiding said oil toward a wall of an air chamber of said compression damper; and
a passageway in said wall of said air chamber through which said oil flows.

2. The shock absorber of claim 1 , wherein said multiple compression speeds comprise:
a low speed compression.

3. The shock absorber of claim 1 , wherein said multiple compression speeds comprise:
a high speed compression.

4. The shock absorber of claim 1 , wherein said multiple compression speeds comprise:
a lockout speed.

5. The shock absorber of claim 1 , wherein said positionally adjustable floating shim stack comprises:
a top surface;
a bottom surface;
a first end that remains unclamped to any other component of said compression damper during a compression of said shock absorber and, upon a position adjustment of said first end such that a first component of said compression damper provides a first pre-load against said top surface at said first end, moves a distance into said fluid passageway; and
a second end that flexes upwards when said flow of fluid through said fluid passageway pushes up against said bottom surface and overcomes a predetermined stiffness of said positionally adjustable floating shim stack.

6. The shock absorber of claim 5 , wherein said position adjustment is accomplished via a manual rotation of a knob coupled with said positionally adjustable floating shim stack.

7. The shock absorber of claim 5 , wherein said first component comprising:
a pre-load hat.

8. The shock absorber of claim 5 , further comprising:
a second component providing a second pre-load against said top surface at said second end during an upward flexing of said second end.

9. The shock absorber of claim 8 , wherein said second component comprises:
a wave spring.

10. The shock absorber of claim 8 , wherein said first component comprises:
a pre-load hat, wherein a first portion of said pre-load hat presses against said positionally adjustable floating shim stack, and a second portion of said pre-load hat presses against said second component, thereby supporting said second pre-load being applied against said top surface at said second end of said positionally adjustable floating shim stack during an upward flexing of said second end.

11. The shock absorber of claim 5 , wherein said positionally adjustable floating shim stack comprising:
a first position corresponding to a low speed compression adjustment wherein said positionally adjustable floating shim stack lies flat across said opening to said fluid passageway.

12. The shock absorber of claim 5 , wherein said positionally adjustable floating shim stack comprising:
a second position corresponding to a compression speed greater than a minimum compression adjustment speed, wherein said second position comprises:
a concave shape.

13. A damper comprising a recirculation system configured for using only one type of oil, said recirculation system comprising:
a cartridge comprising a compression damper, said compression damper further comprising:
a single adjustable fluid circuit configured for controlling a damping rate associated with multiple compression speeds of a shock absorber, wherein said single adjustable fluid circuit comprises:
a fluid passageway through a base valve; and
a positionally adjustable floating shim stack positioned at one end of said fluid passageway, said positionally adjustable floating shim stack configured for selectively blocking a flow of fluid through said fluid passageway;

a leak path configured for, upon compression, enabling oil to leak from said fluid filled chamber of said compression damper to a position exterior to said fluid filled chamber; and
a rod telescopically positioned within said cartridge, wherein a first end of said rod is mounted within said cartridge and, upon compression and rebound, is enabled to move into and out of said cartridge, respectively, through a U-shaped component that seals a cartridge end of said cartridge through which said rod interacts, and a second end of said rod is positioned in an oil bath, wherein said U-shaped component comprises:
a sealing element that is configured for allowing oil from said oil bath that is sticking to a shaft of said rod to remain on said shaft as said shaft enters said fluid filled chamber of said cartridge during compression, and for scraping off said oil from said shaft as said shaft leaves said fluid filled chamber during rebound, thereby leaving said oil that was scraped off in said fluid filled chamber.

14. The compression damper of claim 13 , wherein said multiple compression speeds comprise:
a low speed compression.

15. The compression damper of claim 13 , wherein said multiple compression speeds comprise:
a high speed compression.

16. The compression damper of claim 13 , wherein said multiple compression speeds comprise:
a lockout speed.

17. The compression damper of claim 13 , wherein said positionally adjustable floating shim stack comprises:
a top surface;
a bottom surface;
a first end that remains unclamped to any other component of said compression damper during a compression of said shock absorber and, upon a position adjustment of said first end such that a first component of said compression damper provides a first pre-load against said top surface at said first end, moves a distance into said fluid passageway; and
a second end that flexes upwards when said flow of fluid through said fluid passageway pushes up against said bottom surface and overcomes a predetermined stiffness of said positionally adjustable floating shim stack.

18. The compression damper of claim 17 , wherein said position adjustment is accomplished via a manual rotation of a knob coupled with said positionally adjustable floating shim stack.

19. The compression damper of claim 13 , wherein said recirculati

Assignees

• Fox Factory Inc

Inventors

• Gilbert Damon
• Cox Christopher Paul

Classifications

• F16F9/3485 Primary

  characterised by features of supporting elements intended to guide or limit the movement of the annular discs (F16F9/3488 takes precedence) · CPC title

• F16F9/19

  with a single cylinder {and of single-tube type} · CPC title

• F16F9/3488

  characterised by features intended to affect valve bias or pre-stress · CPC title

• F16F9/44

  Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction (F16F9/53, {F16F13/26} take precedence; temperature correction only F16F9/52) · CPC title

• F16F9/061

  Mono-tubular units · CPC title