Hydraulic fluid reservoir including a flexible housing

Patent metadata

Field	Value
Publication number	US-12409694-B2
Application number	US-202217893805-A
Country	US
Kind code	B2
Filing date	Aug 23, 2022
Priority date	Aug 23, 2022
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

A hydraulic fluid reservoir fluidly couple to a shock absorber. The hydraulic fluid reservoir having a flexible housing, a fluid channel, and a pump provided along the fluid channel. The flexible housing having a flexible wall defining a first interior, with the first interior a variable volume of hydraulic fluid and no air. The fluid channel fluidly coupling the first interior with the shock absorber. The pump being configured to move the flow of hydraulic fluid into or out of the flexible housing. The flexible housing being configured to move between a first position and a second position.

First claim

What is claimed is:

1. A hydraulic fluid reservoir fluidly coupled to a shock absorber, the hydraulic fluid reservoir comprising:
a flexible housing having a first end and second end and a flexible wall extending therebetween defining a first interior, with the first interior a variable volume of hydraulic fluid and no air;
a fluid channel beginning at the first end of the flexible housing and fluidly coupling the first interior of the flexible housing to the shock absorber, the fluid channel configured to permit a flow of hydraulic fluid to enter and exit the first interior of the flexible housing to define the variable volume of hydraulic fluid; and
a pump provided along the fluid channel, the pump being configured to move the flow of hydraulic fluid into or out of the flexible housing;
wherein during operation, the flow of hydraulic fluid expands and contracts the flexible housing between a first position defining a maximum volume of the first interior and a second position defining a minimum volume of the first interior, respectively.

2. The hydraulic fluid reservoir of claim 1 , further comprising an outer housing having an outer wall defining a second interior.

3. The hydraulic fluid reservoir of claim 2 , further comprising a first plate operably coupled to the second end of the flexible housing, wherein at least a portion of the first plate confronts an interior portion of the outer wall.

4. The hydraulic fluid reservoir of claim 3 , wherein the outer housing includes an opening and wherein the fluid channel extends through the opening.

5. The hydraulic fluid reservoir of claim 4 , further comprising a second plate provided along the first end and including a portion of the fluid channel, wherein the first plate is statically mounted to the opening of the outer housing.

6. The hydraulic fluid reservoir of claim 3 , wherein the outer housing defines an axial centerline and wherein the first plate and the flexible housing are configured to move axially, with respect to the axial centerline, when moving between the first position and the second position.

7. The hydraulic fluid reservoir of claim 2 , wherein the flexible housing is provided entirely within the second interior.

8. The hydraulic fluid reservoir of claim 1 , wherein the flexible wall is corrugated such that the flexible housing moves in an accordion style when moving between the first position and the second position.

9. The hydraulic fluid reservoir of claim 1 , wherein the flexible wall is a membrane configured to expand or contract based on the flow of hydraulic fluid entering or exiting the membrane.

10. The hydraulic fluid reservoir of claim 1 , wherein the flexible housing is configured to expand and contract uniformly along at least one plane of motion.

11. The hydraulic fluid reservoir of claim 1 , wherein the flexible housing is configured to expand and contract nonuniformly along at least one plane of motion.

12. The hydraulic fluid reservoir of claim 1 , wherein the hydraulic fluid reservoir is fluidly coupled to the shock absorber for use within a vehicle.

13. The hydraulic fluid reservoir of claim 1 , wherein the fluid channel does not extend into the flexible housing.

14. The hydraulic fluid reservoir of claim 1 , wherein the flexible housing holds only a volume of hydraulic fluid.

15. A hydraulic fluid reservoir fluidly coupled to a shock absorber, the hydraulic fluid reservoir comprising:
a flexible housing having a first end and second end and a flexible wall extending therebetween defining a first interior, with the first interior a variable volume of hydraulic fluid and no air;
an outer housing having an outer wall defining a second interior;
a fluid channel beginning at the first end of the flexible housing and fluidly coupled to the first interior and configured to permit a flow of hydraulic fluid to enter and exit the first interior of the flexible housing to define the variable volume of hydraulic fluid; and
a pump provided along the fluid channel, the pump being configured to move the flow of hydraulic fluid into or out of the flexible housing;
wherein the flexible housing is provided within the second interior.

16. The hydraulic fluid reservoir of claim 15 , wherein the outer casing includes an opening, and wherein the fluid channel extends through the opening.

17. The hydraulic fluid reservoir of claim 16 , further comprising:
a first plate operably coupled to the second end of the flexible housing; and
a second plate provided along the first end and including a portion of the fluid channel, wherein the first plate is statically mounted to the opening of the outer housing;
wherein at least a portion of the first plate confronts an interior portion of the outer wall; and
wherein the fluid channel extends through the opening.

18. The hydraulic fluid reservoir of claim 15 , wherein the flexible wall is corrugated such that the flexible housing moves in an accordion style when moving between the first position and the second position.

19. The hydraulic fluid reservoir of claim 15 , wherein the flexible wall is a membrane configured to expand or contract based on the flow of hydraulic fluid entering or exiting the membrane.

20. A hydraulic fluid reservoir comprising:
a flexible housing having a first end and second end and a flexible housing wall defining an interior;
a fluid channel beginning at the first end of the flexible housing and fluidly coupled to the interior and configured to permit a flow of hydraulic fluid to enter and exit the interior of the flexible housing; and
a pump provided along the fluid channel, the pump being configured to move the flow of hydraulic fluid into or out of the flexible housing;
wherein during operation, the flow of hydraulic fluid can enter or exit the interior of the flexible housing to expand and contract the flexible housing between a first position defining a maximum volume of the interior and a second position defining a minimum volume of the interior, respectively.

Assignees

• Driv Automotive Inc

Inventors

• Olofsson Carl
• Slootmaekers Stein
• Vanwezemael Joris

Classifications

• B60G2206/41

  Dampers · CPC title

• B60G2202/416

  using a pump, e.g. in the line connecting the lower chamber to the upper chamber of the actuator · CPC title

• B60G2202/24

  Fluid damper · CPC title

• B60G13/08

  hydraulic · CPC title

• F15B1/265

  with pressurised main reservoir · CPC title