CN-122014785-A - Self-adaptive stiffness hydro-pneumatic spring and stiffness control method

CN122014785ACN 122014785 ACN122014785 ACN 122014785ACN-122014785-A

Abstract

The invention relates to a self-adaptive stiffness hydro-pneumatic spring and a stiffness control method, and belongs to the technical field of hydro-pneumatic springs. The self-adaptive stiffness hydro-pneumatic spring comprises a main working cylinder, wherein a piston assembly is arranged in the main working cylinder, an inner cavity of the main working cylinder is divided into a first cavity and a second cavity by the piston assembly, oil mist media are filled in the main working cylinder, at least one low-pressure air cavity and at least one high-pressure air cavity are formed in the auxiliary working cylinder, the air pressure in the low-pressure air cavity is lower than the air pressure in the high-pressure air cavity, and the oil circuit assembly is configured to independently communicate the first cavity and the second cavity with the corresponding low-pressure air cavity in the auxiliary working cylinder. The self-adaptive stiffness adjusting device and the self-adaptive stiffness adjusting method realize self-adaptive adjustment of stiffness, improve self-adaptive capacity and damping effect of the hydro-pneumatic spring, and can effectively meet damping requirements under complex working conditions.

Inventors

SUN XINHUA
ZHU SHIJING
XU PENG
DING JIANG
MA TENGYUAN
ZHANG ZEHAN
WANG YONG

Assignees

青岛星华智能装备有限公司

Dates

Publication Date: 20260512
Application Date: 20260331

Claims (10)

1. An adaptive rate hydro-pneumatic spring, comprising The main working cylinder is internally provided with a piston assembly, the inner cavity of the main working cylinder is divided into a first cavity and a second cavity by the piston assembly, and the main working cylinder is filled with oil mist medium; the auxiliary working cylinder is internally provided with at least one low-pressure air cavity and at least one high-pressure air cavity, and the gas pressure in the low-pressure air cavity is lower than the gas pressure in the high-pressure air cavity; The oil-gas spring comprises a first cavity, a second cavity, an oil-gas spring and an oil-gas spring, wherein the first cavity and the second cavity are respectively communicated with a corresponding low-pressure gas cavity in the auxiliary working cylinder independently, when the external load born by the piston assembly is smaller than a rigidity switching threshold force, the oil-gas spring only interacts with the low-pressure gas cavity, the oil-gas spring presents first rigidity, and when the external load born by the piston assembly is larger than or equal to the rigidity switching threshold force, the oil-gas spring simultaneously interacts with the low-pressure gas cavity and the high-pressure gas cavity, and the oil-gas spring is switched to second rigidity larger than the first rigidity.
2. The self-adaptive stiffness hydro-pneumatic spring as defined by claim 1 wherein the secondary working cylinder is internally formed with a high-pressure air chamber at the middle and a first low-pressure air chamber and a second low-pressure air chamber at both sides of the high-pressure air chamber.
3. The adaptive rate hydro-pneumatic spring of claim 2 further comprising an isolation assembly, the isolation assembly further comprising The first floating piston is movably arranged between the first low-pressure air cavity and the high-pressure air cavity; and the second floating piston is movably arranged between the second low-pressure air cavity and the high-pressure air cavity.
4. The adaptive rate hydro-pneumatic spring of claim 3 further comprising a stop assembly, the stop assembly further comprising The two first stop blocks are symmetrically and fixedly arranged in the auxiliary working cylinder and positioned on one side of the first floating piston, which is opposite to the high-pressure air cavity, and the first stop blocks are used for limiting the first floating piston to move to the limit position of the first low-pressure air cavity; the two second check blocks are symmetrically and fixedly arranged in the auxiliary working cylinder and positioned on one side of the second floating piston, which is opposite to the high-pressure air cavity, and the second check blocks are used for limiting the second floating piston to move towards the limit position of the second low-pressure air cavity.
5. The adaptive rate hydro-pneumatic spring of claim 1 wherein the oil circuit assembly comprises: The first communication oil way is used for communicating the first cavity with one of the low-pressure air cavities of the auxiliary working cylinder; the second communication oil way is used for communicating the second cavity with the other low-pressure air cavity of the auxiliary working cylinder; the first damping valve is arranged on the first communication oil path; The second damping valve is arranged on the second communication oil path.
6. The adaptive rate hydro-pneumatic spring of claim 5 wherein the first damping valve and the second damping valve are both electromagnetic damping valves.
7. The adaptive rate hydro-pneumatic spring of claim 5 wherein the first damping valve is configured to control a throttling resistance of the compression stroke of the piston assembly, the second damping valve is configured to control a throttling resistance of the extension stroke of the piston assembly, and the throttling resistances of the first and second damping valves are independently adjustable.
8. The adaptive rate hydro-pneumatic spring of claim 1 wherein the oil mist medium in the primary working cylinder is in direct contact with the low pressure chamber of the secondary working cylinder via the oil circuit assembly.
9. A rate control method of a hydro-pneumatic spring, applied to the self-adaptive rate hydro-pneumatic spring as defined in any one of claims 2 to 8, comprising a compression stroke rate control step of: Applying pressure to the piston assembly, wherein oil mist medium in the first cavity is pressed and flows into a first low-pressure air cavity corresponding to the auxiliary working cylinder through the oil circuit assembly; when the applied pressure is smaller than a preset rigidity switching threshold force, the oil mist medium only interacts with the first low-pressure air cavity, and the hydro-pneumatic spring presents first rigidity; When the applied pressure is greater than or equal to the preset rigidity switching threshold force, the oil mist medium simultaneously interacts with the first low-pressure air cavity and the high-pressure air cavity, and the hydro-pneumatic spring is switched to a second rigidity which is greater than the first rigidity.
10. A method of controlling the stiffness of a gas spring, applied to the self-adaptive stiffness gas spring according to any one of claims 2 to 8, comprising the step of controlling the stiffness of a tensile stroke: applying a pulling force to the piston assembly, wherein the oil mist medium in the second cavity is pressed and flows into a second low-pressure air cavity corresponding to the auxiliary working cylinder through the oil circuit assembly; When the applied tensile force is smaller than a preset rigidity switching threshold force, the oil mist medium only interacts with the second low-pressure air cavity, and the hydro-pneumatic spring presents a first rigidity; when the applied tensile force is greater than or equal to the preset rigidity switching threshold force, the oil mist medium simultaneously interacts with the second low-pressure air cavity and the high-pressure air cavity, and the hydro-pneumatic spring is switched to a second rigidity which is greater than the first rigidity.

Description

Self-adaptive stiffness hydro-pneumatic spring and stiffness control method Technical Field The invention belongs to the technical field of hydro-pneumatic springs, and particularly relates to a hydro-pneumatic spring with self-adaptive rigidity and a rigidity control method, which can be widely applied to various mechanical devices with damping and buffering functions. Background The hydro-pneumatic spring is a special spring applied to an automobile suspension system, and achieves buffering and damping functions through interaction of oil liquid and gas. However, in existing mechanical shock absorbing applications, conventional hydro-pneumatic springs have certain limitations in terms of performance. In addition, in the interaction process of gas and liquid medium, the quick response characteristic of the gas and the good damping effect of the liquid are difficult to be considered, and the integral performance and the damping quality of the hydro-pneumatic spring are affected. Accordingly, there is a need in the art to provide a new type of hydro-pneumatic spring that overcomes the above-described drawbacks. Disclosure of Invention Aiming at the defects existing in the related art, the invention provides the self-adaptive stiffness hydro-pneumatic spring and the stiffness control method, which realize the self-adaptive adjustment of stiffness, improve the self-adaptive capacity and the damping effect of the hydro-pneumatic spring, and can effectively cope with the damping requirement under complex working conditions so as to solve the technical problems of single stiffness performance and delayed damping response existing in the prior art. The self-adaptive stiffness hydro-pneumatic spring can be widely applied to various mechanical devices such as vehicle suspension systems, industrial equipment damping devices and the like which need damping and buffering functions. The invention provides a self-adaptive stiffness hydro-pneumatic spring, which comprises The main working cylinder is internally provided with a piston assembly, the piston assembly divides the inner cavity of the main working cylinder into a first cavity and a second cavity, and the main working cylinder is filled with oil mist medium; the auxiliary working cylinder is internally provided with at least one low-pressure air cavity and at least one high-pressure air cavity, and the gas pressure in the low-pressure air cavity is lower than that in the high-pressure air cavity; The oil-gas spring comprises an oil circuit component and an oil-gas spring, wherein the oil circuit component is configured to independently communicate a first cavity and a second cavity with corresponding low-pressure air cavities in a secondary working cylinder respectively, when the external load born by the piston component is smaller than the rigidity switching threshold force, the oil-gas spring only interacts with the low-pressure air cavities, and when the external load born by the piston component is larger than or equal to the rigidity switching threshold force, the oil-gas spring simultaneously interacts with the low-pressure air cavities and the high-pressure air cavities, and the oil-gas spring is switched to second rigidity larger than the first rigidity. According to the self-adaptive stiffness hydro-pneumatic spring, the main working cylinder, the auxiliary working cylinder and the independent oil circuit component for communicating the main working cylinder and the auxiliary working cylinder are arranged, and the stiffness switching threshold force is used as a judging reference, so that the self-adaptive adjustment of the stiffness is realized. In some embodiments, the auxiliary working cylinder is internally provided with a high-pressure air cavity positioned in the middle, and a first low-pressure air cavity and a second low-pressure air cavity positioned at two sides of the high-pressure air cavity. According to the technical scheme, the hydro-pneumatic spring can share the same high-pressure air cavity in the stretching and compression strokes, so that the structure is simplified, and the control stability of stretching and compression stiffness switching is ensured. In some of these embodiments, an isolation assembly is also included, the isolation assembly further including The first floating piston is movably arranged between the first low-pressure air cavity and the high-pressure air cavity; the second floating piston is movably arranged between the second low-pressure air cavity and the high-pressure air cavity. The floating piston is adopted to separate the auxiliary working cylinder to form a low-pressure air cavity and a high-pressure air cavity, so that the pressure control in the auxiliary working cylinder is realized. In some of these embodiments, a spacing assembly is also included, the spacing assembly further including The two first stop blocks are symmetrically and fixedly arranged in the auxiliary working cylinder and positioned at