Weight optimized bellow accumulator

Patent metadata

Field	Value
Publication number	US-11761507-B2
Application number	US-202117172837-A
Country	US
Kind code	B2
Filing date	Feb 10, 2021
Priority date	Feb 10, 2021
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

A damper assembly includes a damper with a pressure tube and a piston slidably disposed within the pressure tube. A first working chamber is defined on one side of the piston and a second working chamber is defined on an opposite side of the piston such that a volume of the second working chamber decreases during a compression stroke of the piston and the volume of the second working chamber increases during a rebound stroke of the piston. A bellow accumulator assembly is included and in fluid communication with the second working chamber. The bellow accumulator assembly includes a housing, a bellow accumulator disposed within the housing, a pressurized gas chamber defined between the housing and the bellow accumulator and an accumulator chamber defined between the bellow accumulator and the second working chamber.

First claim

What is claimed is:

1. A damper assembly comprising:
a damper with a pressure tube and a piston slidably disposed within the pressure tube, wherein a first working chamber is defined on one side of the piston, a second working chamber is defined on an opposite side of the piston such that a volume of the second working chamber decreases during a compression stroke of the piston and the volume of the second working chamber increases during a rebound stroke of the piston; and
a bellow accumulator assembly in fluid communication with the second working chamber, the bellow accumulator assembly comprising a housing, a bellow accumulator disposed within the housing, a pressurized gas chamber defined between the housing and the bellow accumulator and an accumulator chamber defined between the bellow accumulator and the second working chamber, wherein the bellow accumulator is configured to accept excess working fluid flowing out of the second working chamber during the compression stroke of the piston and provide working fluid to the second working chamber during the rebound stroke of the piston,
wherein the bellow accumulator comprises a bellow-shaped sidewall defining a cylinder and a concave-shaped closed end extending from the bellow-shaped sidewall,
wherein the housing comprises a concave-shaped end that has a complimentary shape with the bellow accumulator and is configured to nest within the concave-shaped closed end of the bellow accumulator.

2. The damper assembly according to claim 1 , wherein the concave-shaped closed end extends into the cylinder defined by the bellow-shaped sidewall.

3. The damper assembly according to claim 2 , wherein the concave-shaped closed end is a paraboloid-shaped end extending from the bellow-shaped sidewall and into the cylinder defined by the bellow-shaped sidewall.

4. The damper assembly according to claim 1 further comprising a remote valve assembly disposed between the damper and the bellow accumulator assembly, wherein the remote valve assembly is configured to regulate flow of working fluid between the damper and the bellow accumulator assembly.

5. The damper assembly according to claim 4 , wherein the bellow accumulator assembly is attached and sealed to the remote valve assembly and the remote valve assembly is attached and sealed to the damper.

6. The damper assembly according to claim 5 , wherein the bellow accumulator assembly further comprises a base with a bore and the housing is at least partially disposed in the bore.

7. The damper assembly according to claim 6 , wherein the base is attached and sealed to the remote valve assembly.

8. The damper assembly according to claim 7 , wherein the housing is mechanically coupled and sealed to the base.

9. The damper assembly according to claim 8 further comprising a first seal disposed between the base and the housing and a second seal disposed between the base and the bellow accumulator.

10. The damper assembly according to claim 9 , wherein the bellow accumulator comprises a flange end and the second seal is disposed between the base and the flange end.

11. The damper assembly according to claim 6 , wherein the bellow accumulator is a metal bellow accumulator welded to the base.

12. The damper according to claim 1 further comprising a reserve tube radially disposed around the pressure tube and a reserve tube chamber defined between the reserve tube and the pressure tube, wherein the first working chamber is in fluid communication with reserve tube chamber.

13. A damper assembly comprising:
a damper with a pressure tube and a piston slidably disposed within the pressure tube, wherein a first working chamber is defined on one side of the piston, a second working chamber is defined on an opposite side of the piston such that a volume of the second working chamber decreases during a compression stroke of the piston and the volume of the second working chamber increases during a rebound stroke of the piston;
a remote valve assembly attached, sealed to and in fluid communication with the damper; and
a bellow accumulator assembly attached, sealed, and in fluid communication with the remote valve assembly, the bellow accumulator assembly comprising a housing, a bellow accumulator disposed within the housing, a pressurized gas chamber defined between the housing and the bellow accumulator and an accumulator chamber defined between the bellow accumulator and the second working chamber, wherein the bellow accumulator is configured to accept excess working fluid flowing out of the second working chamber during the compression stroke of the piston and provide working fluid to the second working chamber during the rebound stroke of the piston,
wherein the bellow accumulator comprises a bellow-shaped sidewall defining a cylinder and a concave-shaped closed end extending from the bellow-shaped sidewall,
wherein the housing comprises a concave-shaped end that has a complimentary shape with the bellow accumulator and is configured to nest within the concave-shaped closed end of the bellow accumulator.

14. The damper assembly according to claim 13 , wherein the bellow accumulator includes
a base with a bore, wherein the housing is disposed at least partially within the bore.

15. The damper assembly according to claim 14 further comprising a first seal disposed between the base and the housing and a second seal disposed between the base and the bellow accumulator.

16. A damper assembly comprising:
a damper with a pressure tube and a piston slidably disposed within the pressure tube, wherein a first working chamber is defined on one side of the piston, a second working chamber is defined on an opposite side of the piston such that a volume of the second working chamber decreases during a compression stroke of the piston and the volume of the second working chamber increases during a rebound stroke of the piston;
a bellow accumulator assembly in fluid communication with the second working chamber, the bellow accumulator assembly comprising a housing, a bellow accumulator disposed within the housing, a pressurized gas chamber defined between the housing and the bellow accumulator and an accumulator chamber defined between the bellow accumulator and the second working chamber, wherein the bellow accumulator is configured to accept excess working fluid flowing out of the second working chamber during the compression stroke of the piston and provide working fluid to the second working chamber during the rebound stroke of the piston; and
a remote valve assembly disposed between the damper and the bellow accumulator assembly, wherein the remote valve assembly is configured to regulate flow of working fluid between the damper and the bellow accumulator assembly,
wherein the bellow accumulator assembly is attached and sealed to the remote valve assembly and the remote valve assembly is attached and sealed to the damper,
wherein the bellow accumulator assembly further comprises a base with a bore and the housing is at least partially disposed in the bore,
wherein the base is attached and sealed to the remote valve assembly,
wherein the housing is mechanically coupled and sealed to the base,
wherein the damper assembly further comprises a first seal disposed between the base and the housing and a second seal disposed between the base and the bellow accumulator, and
wherein the bellow accumulator comprises a flange end and the second seal is disposed between the base and the flange end.

Assignees

• Driv Automotive Inc

Inventors

• Deferme Stefan

Classifications

• F16F9/00 Primary

  Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium (F16F5/00 takes precedence; connection of valves to inflatable elastic bodies B60C29/00; {braking devices, stops or buffers for wing-operating appliances E05F3/00, E05F5/00}) · CPC title

• F16F9/096 Primary

  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

• F16F9/3207

  Constructional features (F16F9/34 - F16F9/50 take precedence; assembly or repair F16F9/3271) · CPC title

• F15B1/16

  in the form of a tube · CPC title

• F15B1/103

  the separating means being bellows · CPC title