IP Library › Granted Patent US 12704165
Granted Patent B2
US 12704165 · App. 18/382,324 · Granted Aug 11, 2026

Dual piston shock assembly

Inventors: Bobby Lee Smith, Jr. (Alpine, CA); Geoffrey Tyler Carlisle (San Diego, CA)
Assignee: Fox Factory, Inc.
F16F9/0227F16F9/44
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Quick Facts
Patent No.
US 12704165
App. No.
18/382,324
Granted
Aug 11, 2026
Kind
B2
Abstract

A dual piston shock assembly is disclosed. The dual piston shock assembly includes a body with a chamber having working fluid therein. A dual piston assembly coupled with a shaft, the dual piston assembly including a compression piston, a rebound piston, and a reservoir port coupled between the compression piston and the rebound piston along an axis of the shaft. The dual piston assembly disposed in the chamber, axially movable relative to the chamber, and separating the chamber into a compression side and a rebound side. A fluid pathway internal to the shaft, the fluid pathway fluidly coupling the chamber with a reservoir via the reservoir port.

Claims (60)

1 . A shock assembly comprising:

a body comprising a chamber with a working fluid therein;

a dual piston assembly coupled with a shaft, said dual piston assembly comprising:

a compression piston;

a rebound piston; and

a reservoir port coupled between said compression piston and said rebound piston along an axis of said shaft;

said dual piston assembly disposed in said chamber and axially movable relative to said chamber, said dual piston assembly separating said chamber into a compression side and a rebound side;

a fluid pathway internal to said shaft, said fluid pathway fluidly coupling said chamber with a reservoir via said reservoir port; and

a bypass flow path, said bypass flow path fluidly coupling said compression side of said chamber with said rebound side of said chamber while bypassing said dual piston assembly.

2 . The shock assembly of claim 1 , wherein said compression piston comprises:

a compression piston valve stack, said compression piston valve stack comprising a cracking pressure related to a firmness characteristic during a compression stroke; and

a compression piston check shim, said compression piston check shim providing a relatively unrestricted flow path through said compression piston during a rebound stroke.

3 . The shock assembly of claim 1 , wherein said rebound piston comprises:

a rebound piston valve stack, said rebound piston valve stack comprising a cracking pressure related to a firmness characteristic during a rebound stroke; and

a rebound piston check shim, said rebound piston check shim providing a relatively unrestricted flow path through said rebound piston during a compression stroke.

4 . The shock assembly of claim 1 wherein said bypass flow path is selected from a group consisting of: an internal bypass and an external bypass.

5 . The shock assembly of claim 1 , further comprising:

a compression adjuster, said compression adjuster configured to modify a compression damping characteristic of said shock assembly.

6 . The shock assembly of claim 5 , wherein said compression adjuster is a manual adjuster.

7 . The shock assembly of claim 5 , wherein said compression adjuster is electronically actuated.

8 . The shock assembly of claim 1 , further comprising:

a rebound adjuster, said rebound adjuster configured to modify a rebound damping characteristic of said shock assembly.

9 . The shock assembly of claim 8 , wherein said rebound adjuster is a manual adjuster.

10 . The shock assembly of claim 8 , wherein said rebound adjuster is electronically actuated.

11 . The shock assembly of claim 1 , further comprising:

a bottom-out cup.

12 . A dual piston shock assembly comprising:

a body comprising a chamber with a working fluid therein;

a dual piston assembly coupled with a shaft, said dual piston assembly comprising:

a compression piston;

a rebound piston; and

a reservoir port coupled between said compression piston and said rebound piston along an axis of said shaft;

said dual piston assembly disposed in said chamber and axially movable relative to said chamber, said dual piston assembly separating said chamber into a compression side and a rebound side;

a fluid pathway internal to said shaft, said fluid pathway fluidly coupling said chamber with a reservoir via said reservoir port; and

a bypass flow path, said bypass flow path fluidly coupling said compression side of said chamber with said rebound side of said chamber while bypassing said dual piston assembly.

13 . The dual piston shock assembly of claim 12 , wherein said compression piston comprises:

a compression piston valve stack, said compression piston valve stack comprising a cracking pressure related to a firmness characteristic during a compression stroke; and

a compression piston check shim, said compression piston check shim providing a relatively unrestricted flow path through said compression piston during a rebound stroke.

14 . The dual piston shock assembly of claim 12 , wherein said rebound piston comprises:

a rebound piston valve stack, said rebound piston valve stack comprising a cracking pressure related to a firmness characteristic during a rebound stroke; and

a rebound piston check shim, said rebound piston check shim providing a relatively unrestricted flow path through said rebound piston during a compression stroke.

15 . The dual piston shock assembly of claim 12 , further comprising:

a compression adjuster, said compression adjuster configured to modify a compression damping characteristic of said shock assembly.

16 . The dual piston shock assembly of claim 15 , wherein said compression adjuster is selected from a group consisting of: a manual adjuster, an electronically actuated adjuster, and a hybrid manual and electronically actuated adjuster.

17 . The dual piston shock assembly of claim 12 , further comprising:

a rebound adjuster, said rebound adjuster configured to modify a rebound damping characteristic of said shock assembly.

18 . The dual piston shock assembly of claim 17 , wherein said rebound adjuster is selected from a group consisting of: a manual adjuster, an electronically actuated adjuster, and a hybrid manual and electronically actuated adjuster.

19 . A dual piston shock assembly comprising:

a body comprising a chamber with a working fluid therein;

a dual piston assembly coupled with a shaft, said dual piston assembly comprising:

a compression piston comprising:

a compression piston valve stack, said compression piston valve stack comprising a cracking pressure related to a firmness characteristic during a compression stroke; and

a compression piston check shim, said compression piston check shim providing a relatively unrestricted flow path through said compression piston during a rebound stroke;

a rebound piston comprising:

a rebound piston valve stack, said rebound piston valve stack comprising a cracking pressure related to a firmness characteristic during said rebound stroke; and

a rebound piston check shim, said rebound piston check shim providing a relatively unrestricted flow path through said rebound piston during said compression stroke; and

a reservoir port coupled between said compression piston and said rebound piston along an axis of said shaft;

said dual piston assembly disposed in said chamber and axially movable relative to said chamber, said dual piston assembly separating said chamber into a compression side and a rebound side;

a fluid pathway internal to said shaft, said fluid pathway fluidly coupling said chamber with a reservoir via said reservoir port; and

a bypass flow path, said bypass flow path fluidly coupling said compression side of said chamber with said rebound side of said chamber while bypassing said dual piston assembly.