Suspension element

Patent metadata

Field	Value
Publication number	US-9944145-B2
Application number	US-201514684082-A
Country	US
Kind code	B2
Filing date	Apr 10, 2015
Priority date	Apr 11, 2014
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A suspension element includes a main body having an internal volume configured to contain a liquid therein, a tubular element extending at least partially within the main body, the tubular element having an internal volume that defines a first fluid chamber configured to contain a compressible gas therein, a first piston separating the internal volume of the main body into a second fluid chamber and a third fluid chamber, a second piston positioned to separate the first fluid chamber from the second fluid chamber, and a flow control element disposed along a flow path between the second fluid chamber and the third fluid chamber. Movement of the tubular element generates a flow of the liquid through the flow control element to produce a damping force and changes the pressure of the compressible gas to produce a spring force.

First claim

The invention claimed is:

1. A suspension element, comprising:
a main body having an internal volume configured to contain a liquid therein;
a tubular element extending at least partially within the main body, wherein the tubular element has an internal volume that defines a first fluid chamber configured to contain a compressible gas therein, and wherein the main body and the tubular element each include a sidewall having an inner surface and an outer surface;
a first piston separating the internal volume of the main body into a second fluid chamber and a third fluid chamber, the third fluid chamber defined by at least the outer surface of the tubular element, the inner surface of the main body, and a surface of the first piston;
a second piston positioned to separate the first fluid chamber from the second fluid chamber; and
at least one flow control element disposed along a flow path between the second fluid chamber and the third fluid chamber and configured to permit flow therethrough in both a first direction and an opposing second direction, wherein the sidewall of the main body defines an aperture therethrough that forms a portion of the flow path, wherein an extension and a contraction of the tubular element generates a flow of the liquid through the at least one flow control element to produce a damping force and changes the pressure of the compressible gas to produce a spring force, and wherein the first piston is configured to prevent direct fluid communication between the second fluid chamber and the third fluid chamber during the extension and the contraction of the tubular element.

2. The suspension element of claim 1 , wherein the first piston couples the tubular element to the main body.

3. The suspension element of claim 1 , wherein the first piston extends between the tubular element and the inner surface of the main body.

4. The suspension element of claim 3 , further comprising a cap disposed over a first end of the main body.

5. The suspension element of claim 4 , further comprising a barrier coupled to a second end of the main body, wherein the barrier is annular and includes an aperture configured to receive the sidewall of the tubular element therethrough.

6. The suspension element of claim 5 , wherein the cap defines an aperture in fluid communication with the second fluid chamber and the third fluid chamber.

7. The suspension element of claim 6 , wherein the at least one flow control element is integrated into the cap.

8. The suspension element of claim 6 , wherein the at least one flow control element is coupled to the main body.

9. The suspension element of claim 5 , further comprising a manifold defining a passage that couples the second fluid chamber with the third fluid chamber, wherein the manifold defines at least a portion of the flow path.

10. The suspension element of claim 9 , wherein the manifold comprises a second tubular element, and wherein the sidewall of the main body is disposed at least partially within the second tubular element.

11. The suspension element of claim 1 , wherein the second fluid chamber and the third fluid chamber comprise hydraulic chambers configured to contain a hydraulic fluid therein.

12. The suspension element of claim 1 , wherein the second piston includes a first side that is directly exposed to the first fluid chamber and a second side that is directly exposed to the second fluid chamber.

Assignees

• Oshkosh Defense Llc

Inventors

• Dillman Patrick S
• Sollenskog Robert K
• Ellifson Erik
• Rositch Aaron J

Classifications

• F16F9/067

  Partitions of the piston type, e.g. sliding pistons · CPC title

• F16F9/46

  allowing control from a distance {, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall (attachment of valve units to cylinders F16F9/325)} · CPC title

• F16F9/3292

  Sensor arrangements · CPC title

• F16F9/062

  Bi-tubular units · CPC title

• B60G2500/2014

  Closed systems · CPC title