US 2025/0012299 A1Published application

Pilot operated blow-off valves for hydraulic actuators

AssigneeClearMotion, Inc.

InventorsClive Tucker, Joseph Thomas Belter

Life of this patent

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Abstract

Disclosed herein are various embodiments of a hydraulic actuator that includes one or more check valves having a dynamically varying cracking pressure. In certain embodiments, a hydraulic actuator may be configured to vary the cracking pressure of a check valve based on an operating condition of a pump of the hydraulic actuator. The check valve may be located along a bypass path in the hydraulic actuator, thereby allowing for fluid flow to bypass a pump of the hydraulic actuator by passing through the check valve. The use of such hydraulic actuators is contemplated in, for example, an active suspension system of a vehicle. Additionally, various embodiments of suitable check valves are disclosed. Additionally, methods are disclosed for operation of the check valve and the hydraulic actuator.

Claims4

Dependent claims

A valve comprising:

a shim stack having a first face and a second face;
a spring element arranged to apply a first force on the first face of the shim stack, wherein the first force is in a first direction;
a first fluid chamber having a first fluid pressure, wherein the first fluid pressure acts on the second face of the shim stack to apply a second force thereon, wherein the second force is in a second direction that is substantially opposite the first direction;
a second fluid chamber having a second fluid pressure, wherein the second fluid pressure acts on the first face of the shim stack to apply a third force thereon, wherein the third force is in the first direction;
a pilot fluid chamber having a pilot fluid pressure, wherein the pilot fluid pressure acts on the first face of the shim stack to apply a fourth force thereon, wherein the fourth force is in the first direction.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/889,623Filed 19 Sep 2024
Priority: 31 May 2017
Published: 9 Jan 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F15B 13/027
Fluid distribution or supply devices characterised by their adaptation to the control of servomotors: check valves
B60G 17/044
Fluid spring characteristics: self-pumping fluid springs
F15B 7/006
With rotary or crank input: rotary pump input
F15B 2211/20561
Type of pump: reversible

Family

Application62/513,375Us provisional application · filed 31 May 2017
Application16/500,667Division · filed 3 Oct 2019
Application18/889,623Division
US 12,117,024 B2Related patent
US 2020/0049266 A1Published application
US 2025/0012299 A1This patent

From the US filing history. Foreign family members aren’t listed.