Dampers for bicycle suspension components

Patent metadata

Field	Value
Publication number	US-11040754-B2
Application number	US-201916251734-A
Country	US
Kind code	B2
Filing date	Jan 18, 2019
Priority date	Jan 18, 2019
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

Example dampers for bicycle suspension components are described herein. An example damper includes a damper body defining a chamber, a shaft extending into the chamber of the damper body, and an adjustable piston system having a piston body coupled to the shaft. The adjustable piston system controls a flow of fluid between the first and second chambers. The adjustable piston system includes an adjustable rebound orifice forming part of a rebound flow path to control the flow of fluid from the first chamber to the second chamber across the piston body, an adjustable compression orifice forming part of a low flow compression flow path to control the flow of fluid from the second chamber to the first chamber across the piston body, an isolation member to separate the rebound flow path and the low flow compression flow path.

First claim

What is claimed is:

1. A damper for a bicycle suspension component, the damper comprising:
a damper body defining a chamber;
a shaft extending into the chamber of the damper body; and
an adjustable piston system having a piston body coupled to the shaft, the piston body slidably received within the damper body, the piston body dividing the chamber into a first chamber and a second chamber, the adjustable piston system to control a flow of fluid between the first and second chambers, the adjustable piston system including:
an adjustable rebound orifice forming part of a rebound flow path to control the flow of fluid from the first chamber to the second chamber across the piston body;
an adjustable compression orifice forming part of a low flow compression flow path to control the flow of fluid from the second chamber to the first chamber across the piston body;
an isolation member disposed between the adjustable rebound orifice and the adjustable compression orifice to separate the rebound flow path and the low flow compression flow path;
a hollow piston bolt coupled to an end of the shaft and extending into the piston body;
a rebound needle tip disposed in the shaft;
a compression needle disposed in the rebound needle tip; and
a compression needle tip coupled to an end of the compression needle and extending through the hollow piston bolt; and

a rebound check valve coupled to the compression needle tip and moveable with the compression needle tip relative to the piston body.

2. The damper of claim 1 , wherein the adjustable piston system further includes a lift plate disposed between the rebound check valve and the piston body.

3. The damper of claim 1 , wherein the rebound check valve is coupled at or near an end of the compression needle tip via a nut.

4. The damper of claim 1 , wherein, during rebound when the adjustable rebound orifice is open, the rebound flow path enables the flow of fluid from the first chamber through the shaft, the adjustable rebound orifice, the compression needle tip, and the rebound check valve, and into the second chamber.

5. The damper of claim 4 , wherein the rebound check valve is to prevent the flow of fluid through the rebound flow path and toward the adjustable rebound orifice during compression.

6. The damper of claim 4 , wherein, during low speed compression when the adjustable compression orifice is open, the low flow compression flow path enables the flow of fluid from the second chamber through the adjustable compression orifice, a passageway between the hollow piston bolt and the compression needle tip, an opening in the hollow piston bolt, a compression check valve, and into the first chamber.

7. A damper for a bicycle suspension component, the damper comprising:
a damper body defining a chamber;
a shaft extending into the chamber of the damper body; and
an adjustable piston system having a piston body coupled to the shaft, the piston body slidably received within the damper body, the piston body dividing the chamber into a first chamber and a second chamber, the adjustable piston system to control a flow of fluid between the first and second chambers, the adjustable piston system including:
an adjustable rebound orifice forming part of a rebound flow path to control the flow of fluid from the first chamber to the second chamber across the piston body;
an adjustable compression orifice forming part of a low flow compression flow path to control the flow of fluid from the second chamber to the first chamber across the piston body; and
an isolation member disposed between the adjustable rebound orifice and the adjustable compression orifice to separate the rebound flow path and the low flow compression flow path,

wherein the isolation member includes a seal disposed in a seal gland formed on an inner surface of a hollow piston bolt, the seal engages the inner surface of the hollow piston bolt and an outer surface of a compression needle tip to prevent the flow of fluid between the hollow piston bolt and the compression needle tip between the adjustable rebound orifice and the adjustable compression orifice.

8. The damper of claim 7 , wherein the seal is an o-ring.

9. A damper for a bicycle suspension component, the damper comprising:
a damper body defining a chamber;
a shaft extending into the chamber of the damper body; and
an adjustable piston system having a piston body coupled to the shaft, the piston body slidably received within the damper body, the piston body dividing the chamber into a first chamber and a second chamber, the adjustable piston system to control a flow of fluid between the first and second chambers, the adjustable piston system including:
an adjustable rebound orifice forming part of a rebound flow path to control the flow of fluid from the first chamber to the second chamber across the piston body;
an adjustable compression orifice forming part of a low flow compression flow path to control the flow of fluid from the second chamber to the first chamber across the piston body; and
an isolation member disposed between the adjustable rebound orifice and the adjustable compression orifice to separate the rebound flow path and the low flow compression flow path; and

the damper further including an internal floating piston disposed in the chamber of the damper body, wherein the piston body includes a primary part and a secondary part coupled to the primary part, and wherein the piston body has a wall extending beyond a bottom side of the secondary part, the wall to engage the internal floating piston to prevent contact between the internal floating piston and a compression needle tip of the adjustable piston system.

10. A damper for a bicycle suspension component, the damper comprising:
a damper body defining a chamber;
a shaft extending into the chamber of the damper body; and
an adjustable piston system having a piston body coupled to the shaft, the piston body slidably received within the damper body, the piston body dividing the chamber into a first chamber and a second chamber, the adjustable piston system defining a flow path between the first chamber to the second chamber across the piston body, the adjustable piston system including:
a compression needle tip extending through the piston body, the compression needle tip moveable relative to the piston body; and
a check valve coupled to the compression needle tip and moveable with the compression needle tip relative to the piston body, the check valve to enable a flow of fluid through the flow path from the first chamber to the second chamber and prevent the flow of fluid through the flow path from the second chamber to the first chamber,
wherein the check valve includes a rebound check plate coupled to the compression needle tip and a check shim coupled to the rebound check plate.

11. The damper of claim 10 , wherein the check shim prevents the flow of fluid into the rebound check plate and through the flow path during compression.

12. The damper of claim 10 , wherein the flow path is a rebound flow path, the adjustable piston system further defining a low flow compression flow path, wherein the adjustable piston system further includes:
an adjustable rebound orifice forming part of the rebound flow path;
an adjustable compression orifice forming part of the low flow compression flow path; and
an isolation member disposed between the adjustable rebound orifice and the adjustable compression orifice to separate the rebound flow path and the low flow compression flow path.

13. The damper of claim 12 , wherein the adjustable piston system further includes a hollow piston bolt, the compression needle ti

Assignees

• Sram Llc

Inventors

• Lynch Timothy

Classifications

• F16F9/466

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

• B62K2025/048

  with suspension manual adjustment details · CPC title

• F16F2222/126

  using gases · CPC title

• F16F2232/08

  Linear · CPC title

• F16F9/096

  comprising a hydropneumatic accumulator of the membrane type provided on the upper or the lower end of a damper or separately from or laterally on the damper {(F16F9/088 takes precedence)} · CPC title