Limiting system for a vehicle suspension component

Patent metadata

Field	Value
Publication number	US-9303715-B2
Application number	US-201313792151-A
Country	US
Kind code	B2
Filing date	Mar 10, 2013
Priority date	Mar 10, 2013
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A damper assembly is disclosed that includes a tubular member, a rod, a primary piston, a secondary piston, and a seal. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap defining an inner volume. The rod extends within the inner volume of the tubular member. The primary piston defines a contact surface and is positioned within the inner volume and coupled to an end of the rod. The secondary piston defines a central aperture and a channel. Engagement of the primary piston and the secondary piston forms a flow conduit between the channel and the contact surface. The seal is disposed between an outer surface of the secondary piston and the sidewall such that a flow path is formed through the central aperture and the flow conduit.

First claim

What is claimed is:

1. A damper assembly, comprising:
a tubular member including a sidewall and a cap positioned at an end of the sidewall, the sidewall and the cap defining an inner volume, wherein the sidewall includes first portion having a first diameter and a second portion having a second diameter, the transition between the first portion and the second portion defining a shoulder;
a rod extending within the inner volume;
a primary piston positioned within the inner volume and coupled to an end of the rod, the primary piston defining a first contact surface and separating the inner volume into a first chamber and a second chamber;
a secondary piston having a diameter that is greater than the second diameter and including a body member having a second contact surface, an opposing second surface, and an inner cylindrical face that defines a central aperture, the secondary piston defining a channel extending radially outward from the inner cylindrical face across the second contact surface to an outer periphery of the body member, wherein engagement of the primary piston and the secondary piston forms a flow conduit defined by the channel and the first contact surface;
a resilient member disposed between the secondary piston and the cap, wherein the secondary piston is biased into engagement with the shoulder by the resilient member; and
a seal disposed between an outer surface of the secondary piston and the sidewall, the seal and the secondary piston separating the second chamber into a recoil chamber and a working chamber, wherein the recoil chamber is defined between the opposing second surface of the secondary piston and the cap, wherein the second contact surface is configured to engage the first contact surface such that an open flow path is formed from the recoil chamber to the working chamber through the central aperture and the flow conduit.

2. The damper assembly of claim 1 , wherein the diameter of the primary piston is less than the second diameter such that the primary piston is extendable along the length of the tubular member.

3. The damper assembly of claim 1 , wherein the primary piston is moveable within the tubular member between a first location, an intermediate location, and an end of stroke.

4. The damper assembly of claim 3 , wherein the primary piston maintains engagement with the secondary piston between the intermediate location and the end of stroke.

5. The damper assembly of claim 4 , wherein the damper assembly provides a base level of damping as the primary piston moves between the first location and the intermediate location and an increased level of damping as the primary piston moves between the intermediate location and the end of stroke.

6. The damper assembly of claim 1 , wherein the secondary piston defines an inner channel within the inner cylindrical face between the second contact surface and the opposing second surface.

7. The damper assembly of claim 6 , wherein the inner channel and the outer surface of the rod define a second fluid conduit.

8. The damper assembly of claim 7 , wherein the seal comprises a polymeric seal.

9. The damper assembly of claim 7 , wherein the channel extending radially outward from the inner cylindrical face across the second contact surface and the inner channel defined within the inner cylindrical face each include a rectangular cross section.

Assignees

• Oshkosh Corp
• Oshkosh Defense Llc

Inventors

• Dillman Patrick S
• Ellifson Erik S
• Rositch Aaron J

Classifications

• F16F9/368

  Sealings in pistons · CPC title

• F16F9/16

  involving only straight-line movement of the effective parts {(wing closers or openers with liquid piston brakes E05F3/04)} · CPC title

• F16F9/49 Primary

  Stops limiting fluid passage, e.g. hydraulic stops {or elastomeric elements inside the cylinder which contribute to changes in fluid damping (fluid-actuated displacement devices with means for accelerating or decelerating the stroke F15B15/22)} · CPC title

• B60G17/08

  Characteristics of fluid dampers (adjusting fluid dampers in general F16F9/44 - F16F9/53) · CPC title

• F16F2222/12

  Fluid damping · CPC title