Bypass for a suspension damper

• US 10,094,443 B2
• Filed: 03/10/2017
• Issued: 10/09/2018
• Est. Priority Date: 01/07/2009
• Status: Active Grant

• Current Assignee: Fox Factory Incorporated
• Original Assignee: Fox Factory Incorporated
• Inventors: Marking, John
• Primary Examiner(s): Irvin, Thomas W
• Application Number:
  US15/455,811
• Publication Number:
  US 20170184174A1
• Time in Patent Office: 578 Days
• CPC Class Codes: B60G 17/015 the regulating means comprising electric or electronic elements B60G17/002, B60G17/005 take precedence
• CPC Class Codes: B60G 17/08 Characteristics of fluid dampers adjusting fluid dampers in general F16F9/44 - F16F9/53
• CPC Class Codes: F16F 9/19 with a single cylinder and of single-tube type
• CPC Class Codes: F16F 9/325 for attachment of valve units
• CPC Class Codes: F16F 9/46 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 Class Codes: F16F 9/461 characterised by actuation means
• CPC Class Codes: F16F 9/466 Throttling control, i.e. regulation of flow passage geometry F16F9/464, F16F9/465 take precedence
• CPC Class Codes: F16F 9/468 controlling at least one bypass to main flow path
• CPC Class Codes: F16F 9/5126 Piston, or piston-like valve elements F16F9/504 takes precedence
• CPC Class Codes: F16F 9/516 resulting in the damping effects during contraction being different from the damping effects during extension , i.e. responsive to the direction of movement F16F9/504 takes precedence
• CPC Class Codes: F16F 9/56 Means for adjusting the length of, or for locking, the spring or damper, e.g. at the end of the stroke F16F9/50 takes precedence; for telescopic gas springs or dampers F16F9/0245; vehicle suspension locking arrangements B60G17/005
• CPC Class Codes: Y10T 137/7935 Head slides on guide-rod concentric with spring

Abstract

A vehicle suspension damper comprises a cylinder and a piston assembly including a damping piston along with working fluid within the cylinder. A bypass permits fluid to avoid dampening resistance of the damping piston. A fluid path through the bypass is controlled by a valve that is shifted by a piston surface when the contents of at least one predetermined volume is injected against the piston surface which acts upon the valve. In one embodiment, the bypass is remotely operable.

Claims

1. A vehicle suspension damper comprising:

a cylinder containing a fluid and a damping piston operable to travel within said fluid in said cylinder, said vehicle suspension damper further including a passageway through said damping piston and limiting a flow rate of said fluid through said damping piston in at least one direction;

a bypass pathway in fluid communication with said cylinder, said bypass pathway providing a path for said fluid to travel between a first side and a second side of said damping piston;

a valve for controlling a flow of said fluid through said bypass pathway, said valve comprising;

a valve body;

a valve piston housed within said valve body, said valve piston having a valve piston surface;

a shaft extending from said valve piston;

a valve member coupled to said shaft, said valve member telescopically mounted to said shaft and said valve member movable with respect to said shaft wherein a gap is formed between said valve member and an end of said shaft;

a spring member mounted on said shaft between said valve member and said valve piston, said spring member biasing said valve member away from said valve piston; and

a manual pre-load adjustment coupled to said valve piston, said manual pre-load adjustment configured to adjust a position of said valve piston; and

at least one predetermined fluid volume in selective fluid communication with said valve piston surface for causing displacement of said valve piston;

wherein the valve is remotely controllable.

2. The vehicle suspension damper of claim 1 wherein said valve further comprises:

a chamber in fluid communication with said valve piston surface; and

a port in fluid communication with said chamber and said valve piston surface.

3. The vehicle suspension damper of claim 2 wherein said predetermined fluid volume is in said selective fluid communication with said valve piston surface via a fluid pathway including said port and said chamber.

4. The vehicle suspension damper of claim 1 wherein said valve member is cone-shaped.

5. The vehicle suspension damper of claim 1 wherein said valve further comprises:

a seat formed in an interior of said valve body, said seat configured to engage with said valve member, said valve in said closed position when said seat engages said valve member.

6. The vehicle suspension damper of claim 1 wherein said valve further comprises:

a vent coupled to said gap, said vent configured to relieve pressure formed in said gap.

7. A suspension damper comprising:

a cylinder containing a fluid and a damping piston operable to travel within said fluid in said cylinder, said suspension damper further including a passageway through said damping piston and limiting a flow rate of said fluid through said damping piston in at least one direction;

a bypass pathway in fluid communication with said cylinder, said bypass pathway providing a path for said fluid to travel between a first side and a second side of said damping piston;

a valve for controlling a flow of said fluid through said bypass pathway, said valve comprising;

a valve body;

a valve piston housed within said valve body, said valve piston having a valve piston surface;

a shaft extending from said valve piston;

a valve member coupled to said shaft, said valve member telescopically mounted to said shaft and said valve member movable with respect to said shaft wherein a gap is formed between said valve member and an end of said shaft; and

a spring member mounted on said shaft between said valve member and said valve piston, said spring member biasing said valve member away from said valve piston; and

at least one predetermined fluid volume in selective fluid communication with said valve piston surface for causing displacement of said valve piston;

wherein the valve is remotely controllable, wherein operation of said at least one predetermined fluid volume does not require use of a pressurized hydraulic system of a vehicle to which said suspension damper is coupled.

8. The suspension damper of claim 7 wherein said operation of said at least one predetermined fluid volume is powered by an existing power supply of a vehicle to which said suspension damper is coupled.

9. The suspension damper of claim 7 wherein said operation of said at least one predetermined fluid volume is not powered by an existing power supply of a vehicle to which said suspension damper is coupled.

10. The suspension damper of claim 7 wherein electrical power for operation of said at least one predetermined fluid volume is supplied by on-board batteries of an existing power supply for a vehicle to which said suspension damper is coupled.

11. The suspension damper of claim 7, wherein said valve further comprises:

a manual pre-load adjustment coupled to said valve piston, said manual pre-load adjustment configured to adjust a position of said valve piston.

12. A suspension damper comprising:

a cylinder containing a fluid and a damping piston operable to travel within said fluid in said cylinder, said suspension damper further including a passageway through said damping piston and limiting a flow rate of said fluid through said damping piston in at least one direction;

a bypass pathway in fluid communication with said cylinder, said bypass pathway providing a path for said fluid to travel between a first side and a second side of said damping piston;

a valve for controlling a flow of said fluid through said bypass pathway, said valve comprising;

a valve body;

a valve piston housed within said valve body, said valve piston having a valve piston surface;

a shaft extending from said valve piston;

a valve member coupled to said shaft, said valve member telescopically mounted to said shaft and said valve member movable with respect to said shaft wherein a gap is formed between said valve member and an end of said shaft; and

a spring member mounted on said shaft between said valve member and said valve piston, said spring member biasing said valve member away from said valve piston; and

at least one predetermined fluid volume in selective fluid communication with said valve piston surface for causing displacement of said valve piston;

wherein said valve is remotely controllable based upon data corresponding to said suspension damper, said data selected from the group consisting of;

speed of a damper piston rod of said suspension damper, compression strain of said damper piston rod of said suspension damper, and eyelet strain of said suspension damper.

13. The suspension damper of claim 12, wherein said valve further comprises:

a manual pre-load adjustment coupled to said valve piston, said manual pre-load adjustment configured to adjust a position of said valve piston.

14. A suspension damper comprising:

a cylinder containing a fluid and a damping piston operable to travel within said fluid in said cylinder, said suspension damper further including a passageway through said damping piston and limiting a flow rate of said fluid through said damping piston in at least one direction;

a bypass pathway in fluid communication with said cylinder, said bypass pathway providing a path for said fluid to travel between a first side and a second side of said damping piston;

a valve for controlling a flow of said fluid through said bypass pathway, said valve comprising;

a valve body;

a valve piston housed within said valve body, said valve piston having a valve piston surface;

a shaft extending from said valve piston;

a valve member coupled to said shaft, said valve member telescopically mounted to said shaft and said valve member movable with respect to said shaft wherein a gap is formed between said valve member and an end of said shaft; and

a spring member mounted on said shaft between said valve member and said valve piston, said spring member biasing said valve member away from said valve piston; and

at least one predetermined fluid volume in selective fluid communication with said valve piston surface for causing displacement of said valve piston;

wherein said valve is remotely controllable based upon vehicle operation variables corresponding to a vehicle to which said suspension damper is coupled, said vehicle operation variables selected from the group consisting of;

vehicle speed, vehicle accelerometer data, vehicle wheel speed, steering wheel rotation for said vehicle, vehicle tire pressure, axle/tie rod forces for said vehicle, braking pressure, and vehicle trajectory.

15. The suspension damper of claim 14, wherein said valve further comprises:

a manual pre-load adjustment coupled to said valve piston, said manual pre-load adjustment configured to adjust a position of said valve piston.

16. A suspension damper comprising:

a cylinder containing a fluid and a damping piston operable to travel within said fluid in said cylinder, said suspension damper further including a passageway through said damping piston and limiting a flow rate of said fluid through said damping piston in at least one direction;

a bypass pathway in fluid communication with said cylinder, said bypass pathway providing a path for said fluid to travel between a first side and a second side of said damping piston;

a valve for controlling a flow of said fluid through said bypass pathway, said valve comprising;

a valve body;

a valve piston housed within said valve body, said valve piston having a valve piston surface;

a shaft extending from said valve piston;

a valve member coupled to said shaft, said valve member telescopically mounted to said shaft and said valve member movable with respect to said shaft wherein a gap is formed between said valve member and an end of said shaft; and

a spring member mounted on said shaft between said valve member and said valve piston, said spring member biasing said valve member away from said valve piston; and

at least one predetermined fluid volume in selective fluid communication with said valve piston surface for causing displacement of said valve piston;

wherein said valve is remotely controllable based upon data corresponding to said suspension damper, said data selected from the group consisting of;

speed of a damper piston rod of said suspension damper, compression strain of said damper piston rod of said suspension damper, and eyelet strain of said suspension damper; and

wherein said valve is remotely controllable based upon vehicle operation variables corresponding to said vehicle, said vehicle operation variables selected from the group consisting of;

vehicle speed, vehicle accelerometer data, vehicle wheel speed, steering wheel rotation for said vehicle, vehicle tire pressure, axle/tie rod forces for said vehicle, braking pressure, and vehicle trajectory.

17. The suspension damper of claim 16, wherein said valve further comprises:

a manual pre-load adjustment coupled to said valve piston, said manual pre-load adjustment configured to adjust a position of said valve piston.