Vehicle suspension systems

• US 8,814,178 B2
• Filed: 03/12/2013
• Issued: 08/26/2014
• Est. Priority Date: 11/14/2012
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Moore, Joseph K., Serbu, Liviu, Lyscio, Anthony L., Ostan, Terry W.
• Primary Examiner(s): Beck, Karen
• Application Number:
  US13/794,941
• Publication Number:
  US 20140131960A1
• Time in Patent Office: 532 Days
• Field of Search: 280/5.514, 280/5.507, 280/6.151, 280/6.157
• US Class Current: 280/5.514
• CPC Class Codes: B60G 17/0165 to an external condition, e.g. rough road surface, side wind
• CPC Class Codes: B60G 17/021 the mechanical spring being a coil spring B60G17/0272 takes precedence
• CPC Class Codes: B60G 17/08 Characteristics of fluid dampers adjusting fluid dampers in general F16F9/44 - F16F9/53
• CPC Class Codes: B60G 2202/41 Fluid actuator
• CPC Class Codes: B60G 2500/30 Height or ground clearance

Abstract

A suspension system for a vehicle includes a damper and a jack assembly. The damper includes a first tube defining a first cavity and having a longitudinal axis, a second tube disposed within the first cavity and defining a second cavity, wherein the second tube is spaced apart from the first tube to define a reservoir chamber, and a piston translatable within the second cavity along the axis, wherein the piston abuts the second tube to define a rebound chamber and a compression chamber. The system includes a jack assembly attached to the damper and configured for raising and lowering the body with respect to the wheel. The assembly includes a jack piston abutting the first tube, and a jack cylinder also abutting the first tube and translatable with respect to the jack piston to thereby raise and lower the body. A vehicle including the suspension system is also disclosed.

Claims

1. A suspension system for a vehicle, the suspension system comprising:

a damper including;

a first end attachable to a body of the vehicle;

a second end spaced apart from the first end and attachable to a wheel of the vehicle;

a first tube defining a first cavity therein and having a central longitudinal axis;

a second tube disposed within the first cavity and defining a second cavity therein, wherein the second tube is spaced apart from the first tube to define a reservoir chamber therebetween; and

a piston translatable within the second cavity along the central longitudinal axis, wherein the piston sealingly abuts the second tube to define a rebound chamber at the first end and a compression chamber at the second end;

a jack assembly attached to the damper and configured for raising and lowering the body of the vehicle with respect to the wheel, wherein the jack assembly includes;

a jack piston abutting the first tube; and

a jack cylinder abutting the first tube and translatable with respect to the jack piston to thereby raise and lower the body of the vehicle;

wherein the jack piston and the jack cylinder define a jack chamber therebetween at the first end;

a fluid flowable between the rebound chamber, the reservoir chamber, and the jack chamber;

a fluid connection element disposed between the first tube and the second tube and configured for fluidly connecting the rebound chamber with the jack chamber;

a first control valve disposed in fluid communication with the jack chamber and the rebound chamber;

a first check valve disposed between and in fluid communication with the first control valve and the jack chamber;

a second control valve disposed in fluid communication with the jack chamber and the reservoir chamber; and

a second check valve disposed between and in fluid communication with the second control valve and the reservoir chamber;

wherein each of the first control valve, the first check valve, the second control valve, and the second check valve is transitionable between an open position and a closed position.

2. The suspension system of claim 1, wherein the jack chamber is disposed in fluid communication with the reservoir chamber so that the fluid flows from the jack chamber to the reservoir chamber to thereby lower the body of the vehicle toward the wheel.

3. The suspension system of claim 1, wherein the rebound chamber is disposed in fluid communication with the jack chamber so that the fluid flows from the rebound chamber to the jack chamber to thereby raise the body of the vehicle away from the wheel.

4. The suspension system of claim 1, wherein the first control valve and the first check valve are disposed in the open position, and the second control valve and the second check valve are disposed in the closed position so that the fluid flows from the rebound chamber to the jack chamber, and does not flow from the rebound chamber to the reservoir chamber, to thereby raise the jack cylinder and the body of the vehicle away from the wheel.

5. The suspension system of claim 1, wherein the first control valve and the first check valve are disposed in the closed position, and the second control valve and the second check valve are disposed in the open position so that the fluid flows from the jack chamber to the reservoir chamber, and does not flow from the rebound chamber to the jack chamber, to thereby lower the jack cylinder and the body of the vehicle toward the wheel.

6. The suspension system of claim 1, further including an accumulator configured for storing the fluid, wherein the accumulator is disposed between and in fluid communication with the rebound chamber and the second control valve.

7. The suspension system of claim 1, further including a vessel configured for regulating a volume of the fluid disposed within the reservoir chamber, wherein the vessel is disposed between and in fluid communication with the first control valve and the reservoir chamber.

8. A vehicle comprising:

a body;

a wheel configured for translating the body across a surface; and

a suspension system interconnecting the body and the wheel and including;

a damper including;

a first end attached to the body;

a second end spaced apart from the first end and attached to the wheel;

a first tube defining a first cavity therein and having a central longitudinal axis;

a second tube disposed within the first cavity and defining a second cavity therein, wherein the second tube is spaced apart from the first tube to define a reservoir chamber therebetween; and

a piston translatable within the second cavity along the central longitudinal axis, wherein the piston sealingly abuts the second tube to define a rebound chamber at the first end and a compression chamber at the second end; and

a jack assembly attached to the damper and configured for raising and lowering the body with respect to the wheel, wherein the jack assembly includes;

a jack piston coaxial with the central longitudinal axis and fixedly attached to the first tube so that the jack piston is not translatable along the first tube;

a jack cylinder abutting the first tube and the jack piston;

wherein the jack piston and the jack cylinder define a jack chamber therebetween at the first end;

wherein the jack cylinder is translatable with respect to the jack piston along the first tube;

a fluid flowable between the rebound chamber, the reservoir chamber, and the jack chamber;

a first control valve disposed in fluid communication with the jack chamber and the rebound chamber;

a first check valve disposed between and in fluid communication with the first control valve and the jack chamber;

a second control valve disposed in fluid communication with the jack chamber and the reservoir chamber; and

a second check valve disposed between and in fluid communication with the second control valve and the reservoir chamber;

wherein the piston alternately cycles toward and away from the wheel along the central longitudinal axis as the wheel translates the body across the surface to thereby fill the jack chamber with the fluid from the rebound chamber through the first control valve and the first check valve, and thereby raise the jack cylinder and the body with respect to the wheel; and

wherein the piston alternately cycles toward and away from the wheel along the central longitudinal axis as the wheel translates the body across the surface to thereby empty the fluid from the jack chamber to the reservoir chamber through the second control valve and the second check valve, and thereby lower the jack cylinder and the body with respect to the wheel.

9. The vehicle of claim 8, further including a mount disposed between and attached to the body and the first end, and a steering component attached to the wheel and the second end.

11. The vehicle of claim 8, wherein each of the first control valve, the first check valve, the second control valve, and the second check valve is transitionable between an open position and a closed position;

and

further wherein the first control valve and the first check valve are disposed in the open position, and the second control valve and the second check valve are disposed in the closed position so that the fluid flows from the rebound chamber to the jack chamber, and does not flow from the rebound chamber to the reservoir chamber, to thereby raise the jack cylinder and the body away from the wheel.

12. The vehicle of claim 8, wherein each of the first control valve, the first check valve, the second control valve, and the second check valve is transitionable between an open position and a closed position;

and

further wherein the first control valve and the first check valve are disposed in the closed position, and the second control valve and the second check valve are disposed in the open position so that the fluid flows from the jack chamber to the reservoir chamber, and does not flow from the rebound chamber to the jack chamber, to thereby lower the jack cylinder and the body toward the wheel.

13. The vehicle of claim 8, further including an accumulator configured for storing the fluid, wherein the accumulator is disposed between and in fluid communication with the rebound chamber and the second control valve.

14. The vehicle of claim 8, further including a vessel configured for regulating a volume of the fluid disposed within the reservoir chamber, wherein the vessel is disposed between and in fluid communication with the first control valve and the reservoir chamber.

10. A vehicle comprising:

a body;

a wheel configured for translating the body across a surface; and

a suspension system interconnecting the body and the wheel, the suspension system including;

a damper including;

a first end attached to the body;

a second end spaced apart from the first end and attached to the wheel;

a first tube defining a first cavity therein and having a central longitudinal axis;

a second tube disposed within the first cavity and defining a second cavity therein, wherein the second tube is spaced apart from the first tube to define a reservoir chamber therebetween; and

a piston translatable within the second cavity along the central longitudinal axis, wherein the piston sealingly abuts the second tube to define a rebound chamber at the first end and a compression chamber at the second end; and

a jack assembly attached to the damper and configured for raising and lowering the body with respect to the wheel, wherein the jack assembly includes;

a jack piston abutting the first tube and coaxial with the central longitudinal axis;

wherein the first tube and the jack piston define a jack chamber therebetween at the second end;

a jack cylinder abutting the first tube;

wherein the jack cylinder is translatable along the jack piston;

a fluid flowable between the rebound chamber, the reservoir chamber, and the jack chamber;

a first control valve disposed in fluid communication with the jack chamber and the reservoir chamber;

a first check valve disposed between and in fluid communication with the first control valve and the reservoir chamber;

a second control valve disposed in fluid communication with the jack chamber and the rebound chamber; and

a second check valve disposed between and in fluid communication with the second control valve and the jack chamber;

wherein the piston alternately cycles toward and away from the wheel along the central longitudinal axis as the wheel translates the body across the surface to thereby fill the jack chamber with the fluid from the rebound chamber through the second control valve and the second check valve, and thereby raise the first tube, the jack cylinder, and the body with respect to the wheel; and

wherein the piston alternately cycles toward and away from the wheel along the central longitudinal axis as the wheel translates the body across the surface to thereby empty the fluid from the jack chamber to the reservoir chamber through the first control valve and the first check valve, and thereby lower the first tube, the jack cylinder, and the body with respect to the wheel.

15. The vehicle of claim 10, wherein the jack piston defines a third cavity therein, and further wherein the first tube is translatable within the third cavity.

16. The vehicle of claim 10, further including a fluid connection element disposed between the first tube and the second tube and configured for fluidly connecting the rebound chamber with the jack chamber.

17. The vehicle of claim 10, wherein each of the first control valve, the first check valve, the second control valve, and the second check valve is transitionable between an open position and a closed position;

and

further wherein the second control valve and the second check valve are disposed in the open position so that the rebound chamber and the jack chamber are disposed in fluid communication, and the first control valve and the first check valve are disposed in the closed position so that the rebound chamber and the reservoir chamber are not disposed in fluid communication such that the fluid flows from the rebound chamber to the jack chamber, and does not flow from the rebound chamber to the reservoir chamber, to thereby raise the first tube and the body away from the wheel.

18. The vehicle of claim 10, wherein each of the first control valve, the first check valve, the second control valve, and the second check valve is transitionable between an open position and a closed position;

and

further wherein the second control valve and the second check valve are disposed in the closed position so that the rebound chamber and the reservoir chamber are not disposed in fluid communication, and the first control valve and the first check valve are disposed in the open position so that the jack chamber and the reservoir chamber are disposed in fluid communication such that the fluid flows from the jack chamber to the reservoir chamber, and does not flow from the rebound chamber to the reservoir chamber, to thereby lower the first tube and the body toward the wheel.

19. The vehicle of claim 10, further including an accumulator configured for storing the fluid, wherein the accumulator is disposed between and in fluid communication with the rebound chamber and the second control valve.

20. The vehicle of claim 10, further including a vessel configured for regulating a volume of the fluid within the reservoir chamber, wherein the vessel is disposed between and in fluid communication with the first control valve and the reservoir chamber.