CN113022245B

CN113022245B - Gas-liquid interconnected suspension system and damping adjustment method

Info

Publication number: CN113022245B
Application number: CN202110364993.0A
Authority: CN
Inventors: 郭凯; 魏铭; 谭川; 张远骏; 郝守海; 黄发明; 邓广
Original assignee: Dongfeng Commercial Vehicle Co Ltd
Current assignee: Dongfeng Commercial Vehicle Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2022-09-09
Anticipated expiration: 2041-03-31
Also published as: CN113022245A

Abstract

The application relates to the technical field of automobile suspension systems, and discloses a gas-liquid interconnected suspension system which comprises a shock absorber and an air spring, wherein the shock absorber comprises an oil storage cylinder and a working cylinder, a branch pipeline extending outwards is formed in the side wall of the oil storage cylinder, and a stroke valve is arranged in the branch pipeline; the branch pipeline and the stroke valve form a bypass oil channel with changeable opening degree; the bypass oil passage is communicated to the rod cavity of the working cylinder and the bottom cavity of the oil storage cylinder; a through piston cavity is formed in the middle of a spring piston of the air spring; an induction piston is arranged in the piston cavity; a hydraulic oil pipe filled with hydraulic oil is connected between the bottom of the piston cavity and the stroke valve; when the air spring works, the induction piston drives the stroke valve to change the opening of the bypass oil channel through hydraulic oil. According to the suspension system and the damping adjusting method, the air spring is linked with the shock absorber, and the air spring is used as an opening adjusting structure of the shock absorber, so that the damping adjusting performance of the shock absorber is more excellent.

Description

Gas-liquid interconnected suspension system and damping adjustment method

Technical Field

The application relates to the technical field of automobile suspension systems, in particular to a gas-liquid interconnected suspension system and a damping adjusting method.

Background

With the development of the automotive industry, suspension systems that are critical to vehicle handling and ride performance are also continuously making progress and breakthroughs. The ideal damping characteristic of the suspension system is that the damping force of the shock absorber of the suspension system is expected to change along with different vehicle working conditions and road conditions.

In the related art, damping-adjustable suspension systems developed in the industry are mainly divided into three types, the first type is a mechanical gear type damping-adjustable shock absorber, and the damping-adjustable shock absorber changes the damping force by changing the size of the oil passage circulation aperture of the shock absorber; the second is a frequency adaptive shock absorber that can adjust the frequency of the damping vibration without relying on the driver to adjust the damping force.

However, the adjustment of the damping force of the first mechanical gear type damping adjustable shock absorber depends on the driver to adjust the gear in advance and can not be associated with the working condition of the vehicle and the road condition in real time; in the second frequency self-adaptive shock absorber, the limited adjusting range of the second frequency self-adaptive shock absorber cannot be changed after the shock absorber leaves a factory. The defects of the two shock absorbers are very obvious, and therefore, designing a suspension system with a damping adjustable function and more excellent performance is a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

Aiming at the defects in the prior art, the application aims to provide a gas-liquid interconnected suspension system and a damping adjusting method, wherein an air spring and a shock absorber are linked, and the air spring is used as an opening adjusting structure of the shock absorber, so that the damping adjusting performance of the shock absorber is more excellent.

In order to achieve the purpose, the gas-liquid interconnected suspension system comprises a shock absorber and an air spring, wherein the shock absorber comprises an oil storage cylinder and a working cylinder, a branch pipeline extending outwards is formed in the side wall of the oil storage cylinder, and a stroke valve is arranged in the branch pipeline; the branch pipeline and the stroke valve form a bypass oil channel with changeable opening degree; the bypass oil passage is communicated to a rod cavity of the working cylinder and a bottom cavity of the oil storage cylinder; a through piston cavity is formed in the middle of a spring piston of the air spring; an induction piston is arranged in the piston cavity; a hydraulic oil pipe filled with hydraulic oil is arranged between the bottom of the piston cavity and the stroke valve; when the air spring works, the induction piston drives the stroke valve to change the opening of the bypass oil passage through hydraulic oil.

In some embodiments, the side wall of the rod cavity is provided with an upper notch, the bottom cavity is provided with a lower notch, and the upper notch and the lower notch are both communicated with the branch pipeline; the piston movable height of the shock absorber does not exceed the height of the upper notch.

In some embodiments, the air spring further comprises an air bag body, the top of the air bag body is fixed on the vehicle body, and the bottom of the spring piston is fixed on the suspension bracket; the piston cavity comprises a large-diameter blind hole and a small-diameter through hole which are nested in a double-layer mode, and the small-diameter through hole is connected with the hydraulic oil pipe; the induction piston comprises a large cylindrical end and a small cylindrical end, the large cylindrical end slides along the inner wall of the large-diameter blind hole, and the small cylindrical end slides along the small-diameter through hole.

In some embodiments, one end of the hydraulic oil pipe is provided with a clamping sleeve joint, and the clamping sleeve joint is fixedly communicated with the bottom of the small-diameter through hole.

In some embodiments, the travel valve includes a valve cover, a valve body, a plunger, and a spring; the valve body is fixed on the branch pipeline in a sealing way; the valve cover is arranged at the end part of the branch pipeline, an oil cavity is formed at the position, opposite to the valve body, of the valve cover, and the hydraulic oil pipe penetrates through the valve cover and is communicated with the oil cavity; the plunger is slidably arranged in the center of the valve body, and one end of the valve body, which is close to the shock absorber, is provided with a hydraulic oil channel; a spring for resetting is arranged on one side of the plunger, which faces the oil storage cylinder; the plunger changes the opening degree of the hydraulic oil passage by sliding.

In some embodiments, the hydraulic oil passage includes three or more strip-shaped passages parallel to the plunger, and the three or more strip-shaped passages are uniformly arranged along the axial direction of the valve body and in the circumferential direction.

In some embodiments, the stroke valve further comprises a spring seat and a communication sleeve, the communication sleeve is in butt joint with the middle cylinder of the shock absorber, and the spring seat is used for abutting against the spring.

The application also discloses a damping adjustment method of the suspension system based on the gas-liquid interconnection, which comprises the following steps:

when the external load of the air spring is changed, the internal air pressure is changed, and the induction piston moves upwards or downwards relative to the piston cavity;

the induction piston drives the stroke valve through hydraulic oil of the hydraulic oil pipe;

the stroke valve changes the opening degree of the bypass oil channel to be larger or smaller;

the size of the oil channel of the shock absorber changes, and the damping characteristic changes.

In some embodiments, the side wall of the rod cavity is provided with an upper notch, the bottom cavity is provided with a lower notch, and the upper notch and the lower notch are both communicated with the branch pipeline; the piston movable height of the shock absorber does not exceed the height of the upper notch; the air spring also comprises an air bag body, the top of the air bag body is fixed on a vehicle body, and the bottom of the spring piston is fixed on the suspension bracket; the piston cavity comprises a large-diameter blind hole and a small-diameter through hole which are nested in a double-layer mode, and the small-diameter through hole is connected with the hydraulic oil pipe; the induction piston comprises a large cylindrical end and a small cylindrical end, the large cylindrical end slides along the inner wall of the large-diameter blind hole, and the small cylindrical end slides along the small-diameter through hole.

The technical scheme who provides this application brings beneficial effect includes:

according to the gas-liquid interconnected suspension system and the damping adjusting method, the shock absorber and the air spring of the existing vehicle are optimized and improved; a bypass oil passage is additionally arranged on the basis of a main oil passage of the existing shock absorber; the bypass oil passage is directly communicated with the rod cavity of the working cylinder and the bottom cavity of the oil storage cylinder; meanwhile, the air spring is linked with the shock absorber, the air spring is used as an opening adjusting structure of the shock absorber, the air spring senses the change of external load, the stroke valve is driven by hydraulic oil of the hydraulic oil pipe, the opening size of the bypass oil passage is changed, the damping characteristic of the shock absorber is changed, the shock absorber is related to the working condition and road condition of the vehicle in real time, the shock absorber is stronger in adaptability to external load, and the added bypass oil passage enables the shock absorber to be larger in damping adjusting performance range, more flexible in adjustment and more superior in performance.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a suspension system provided in an embodiment of the present application;

FIG. 2 is an enlarged view of a portion of a main oil passage and a bypass oil passage provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a travel valve provided in an embodiment of the present application;

FIG. 4 is a cross-sectional view of the valve body and plunger;

reference numerals: 1. a shock absorber; 110. a main oil passage; 12. a branch pipeline; 120. a bypass oil passage; 2. an air spring; 21. an airbag body; 22. a spring piston; 210. an induction piston; 211. a piston cavity; 3. a hydraulic oil pipe; 31. a ferrule fitting; 4. a stroke valve; 41. a valve cover; 42. a valve body; 43. a plunger; 44. a spring; 45. a spring seat; 46. a communicating sleeve; 47. a hydraulic oil passage; 48. an oil cavity; 61. an oil storage cylinder; 62. an intermediate barrel; 63. a working cylinder; 630. a rod cavity; 631. a rodless cavity; 610. a bottom cavity.

Detailed Description

The technical solutions of the present application will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

As shown in fig. 1 and 2, the present application discloses an embodiment of a gas-liquid interconnected suspension system, which comprises a shock absorber 1 and an air spring 2, wherein the shock absorber 1 comprises a reservoir 61, an intermediate tube 62 and a working tube 63 from the outside to the inside. The side wall of the oil storage cylinder 61 is provided with a branch pipeline 12 extending outwards, and a stroke valve 4 is arranged in the branch pipeline 12. The branch line 12 and the stroke valve 4 form a bypass passage 120 (see a broken line in fig. 2) whose opening degree is variable, and the bypass passage 120 communicates with the rod chamber 630 of the cylinder 63 and the bottom chamber 610 of the reservoir 61. Specifically, the cylinder 63 is divided into a rod chamber 630 and a non-rod chamber 631.

The air spring 2 comprises an airbag body 21 and a spring piston 22, wherein the spring piston 22 is inserted into the bottom of the airbag body 21, a through piston cavity 211 is formed in the center of the spring piston 22, and a movable sensing piston 210 is arranged in the piston cavity 211. As the air pressure within the air spring 2 changes, the sensing piston 210 moves up and down relative to the piston cavity 211.

The suspension system further comprises a hydraulic oil pipe 3, the hydraulic oil pipe 3 is connected between the bottom of the piston cavity 211 and the stroke valve 4, and the hydraulic oil pipe 3 is filled with hydraulic oil. When the air spring 2 works, the change of the air pressure in the air spring 2 enables the induction piston 210 to move downwards or upwards relative to the piston cavity 211, and the downward or upwards movement of the piston cavity 211 acts on hydraulic oil to drive the plunger 43 of the stroke valve 4 to move, so that the opening degree of the bypass oil channel 120 is changed.

Preferably, the side wall of the rod cavity 630 is provided with an upper notch, the bottom cavity 610 is provided with a lower notch, and both the upper notch and the lower notch are communicated with the branch pipeline 12; the piston of the shock absorber 1 has a height not exceeding the height of the upper notch. The piston of shock absorber 1 always moves between the upper indentation and the bottom of rod chamber 630.

In one embodiment, the suspension system comprises a shock absorber 1 and an air spring 2, wherein the shock absorber 1 comprises an oil storage cylinder 61 and a working cylinder 63, a branch pipeline 12 extending outwards is formed in the side wall of the oil storage cylinder 61, and a stroke valve 4 is arranged in the branch pipeline 12; the branch pipe 12 and the stroke valve 4 form a bypass passage 120 whose opening size can be changed; the bypass passage 120 communicates with the rod chamber 630 of the cylinder 63 and the bottom chamber 610 of the reservoir 61. A through piston cavity 211 is arranged in the middle of the spring piston 22 of the air spring 2; an induction piston 210 is disposed within the piston cavity 211. A hydraulic oil pipe 3 filled with hydraulic oil is arranged between the bottom of the piston cavity 211 and the stroke valve 4; when the air spring 2 works, the induction piston 210 drives the stroke valve 4 to change the opening degree of the bypass passage 120 through hydraulic oil. The suspension system of this application, through the change of air spring 2 response external load, through hydraulic oil drive stroke valve 4 of hydraulic pressure oil pipe 3 to change the aperture size of bypass oil way passageway 120, change the damping characteristic of shock absorber 1, make the adaptability of shock absorber 1 and external loads such as vehicle conditions road conditions stronger.

In another embodiment, the suspension system comprises a shock absorber 1 and an air spring 2, the shock absorber 1 comprises an oil storage cylinder 61 and a working cylinder 63, a branch pipeline 12 extending outwards is arranged on the side wall of the oil storage cylinder 61, and a stroke valve 4 is arranged in the branch pipeline 12; the branch pipe 12 and the stroke valve 4 form a bypass passage 120 whose opening degree can be changed; the bypass passage 120 communicates with the rod chamber 630 of the cylinder 63 and the bottom chamber 610 of the reservoir 61. A through piston cavity 211 is arranged in the middle of the spring piston 22 of the air spring 2; an induction piston 210 is disposed within the piston cavity 211. A hydraulic oil pipe 3 filled with hydraulic oil is arranged between the bottom of the piston cavity 211 and the stroke valve 4; when the air spring 2 works, the induction piston 210 drives the stroke valve 4 to change the opening degree of the bypass passage 120 through hydraulic oil. The air spring 2 comprises an air bag body 21 and a spring piston 22, the top of the air bag body 21 is fixed on a vehicle body, and the bottom of the spring piston 22 is fixed on a suspension bracket; the piston cavity 211 comprises a large-diameter blind hole, a small-diameter through hole is arranged in the large-diameter blind hole, the small-diameter through hole is nested in the center of the large-diameter blind hole, a cylindrical protection wall with a corresponding size is arranged on the periphery of the small-diameter through hole, and the cylindrical protection wall is matched with the induction piston 210. The small-diameter through hole is connected with a hydraulic oil pipe 3. The inductive piston 210 includes a large cylindrical end that slides along the inner wall of the large-diameter blind hole, and a small cylindrical end that slides along the small-diameter through hole, the small cylindrical end being inserted into the cylindrical retaining wall. The spring piston 22 of this application structural design is ingenious, sets up a piston again in spring piston 22 is inside, under the prerequisite that does not change current air spring 2 structure, undercuts spring piston 22 part can realize with the linkage of hydraulic pressure oil pipe 3, simple structure.

Preferably, one end of hydraulic oil pipe 3 sets up ferrule 31, and hydraulic oil pipe 3 passes through ferrule 31 and fixes the bottom that communicates the minor diameter through-hole, and hydraulic oil pipe 3 passes through ferrule 31 and is connected closely with the minor diameter through-hole, and sealing performance is good.

In one embodiment, the suspension system comprises a shock absorber 1 and an air spring 2, wherein the shock absorber 1 comprises an oil storage cylinder 61 and a working cylinder 63, a branch pipeline 12 extending outwards is formed in the side wall of the oil storage cylinder 61, and a stroke valve 4 is arranged in the branch pipeline 12; the branch pipe 12 and the stroke valve 4 form a bypass passage 120 whose opening degree can be changed; the bypass passage 120 communicates with the rod chamber 630 of the cylinder 63 and the bottom chamber 610 of the reservoir 61. A through piston cavity 211 is arranged in the middle of the spring piston 22 of the air spring 2; an induction piston 210 is disposed within the piston cavity 211. A hydraulic oil pipe 3 filled with hydraulic oil is arranged between the bottom of the piston cavity 211 and the stroke valve 4; when the air spring 2 works, the induction piston 210 drives the stroke valve 4 to change the opening degree of the bypass passage 120 through hydraulic oil. The stroke valve 4 includes a bonnet 41, a valve body 42, a plunger 43, and a spring 44. The valve body 42 is fixed in the branch pipeline 12 in a sealing way; the valve cover 41 is disposed at the end of the branch pipe 12, and the central axes of the valve body 42 and the valve cover 41 are coaxial with the axis of the branch pipe 12. The outer diameter of the large-diameter section of the valve body 42 and the outer diameter of the valve cover 41 are both equal to the inner diameter of the branch pipe 12. The valve cover 41 is arranged opposite to the large-diameter section of the valve body 42 and forms an oil cavity 48, and the hydraulic oil pipe 3 passes through the valve cover 41 and is communicated with the oil cavity 48. The oil cavity 48 is filled with hydraulic oil, the plunger 43 is slidably disposed at the center of the valve body 42, and a hydraulic oil passage 47 is disposed at one end of the valve body 42 close to the shock absorber 1. A spring 44 for return is provided on the plunger 43 on the side facing the reservoir 61; the plunger 43 changes the opening degree of the hydraulic oil passage 47 by sliding.

Specifically, when the air spring 2 changes in external load, the internal air pressure changes, and the sensing piston 210 moves up or down relative to the piston cavity 211. When the sensing piston 210 moves downward relative to the piston cavity 211, the hydraulic oil in the hydraulic oil pipe 3 is squeezed, and the plunger 43 is driven to slide toward the shock absorber 1, so that the opening degree of the hydraulic oil passage 47 becomes smaller and even closed. When the sensing piston 210 moves upward relative to the piston cavity 211, the spring 44 drives the plunger 43 to slide toward the air spring 2 under the action of elastic force, so that the opening degree of the hydraulic oil passage 47 becomes larger and larger until the hydraulic oil passage is completely opened.

Further, the hydraulic oil passage 47 includes three or more strip-shaped passages parallel to the plunger 43, and the three or more strip-shaped passages are uniformly arranged in the axial direction and the circumferential direction of the valve body 42. Preferably, the hydraulic oil passage 47 includes six strip-shaped passages parallel to the plunger 43, and the six strip-shaped passages are circumferentially and uniformly arranged in the axial direction of the valve body 42. The even strip passageway that sets up of this application can be when plunger 43 changes the aperture size of hydraulic oil passageway 47, and the reaction is sensitive nimble more.

As shown in fig. 3 and 4, in one embodiment, the stroke valve 4 includes a valve cover 41, a valve body 42, a plunger 43, and a spring 44. The valve body 42 is fixed in the branch pipeline 12 in a sealing way; the valve cover 41 is disposed at the end of the branch pipe 12, and the central axes of the valve body 42 and the valve cover 41 are coaxial with the axis of the branch pipe 12. The stroke valve 4 further comprises a spring seat 45 and a communication sleeve 46, wherein the communication sleeve 46 is in butt joint with the middle cylinder 62 of the shock absorber 1, and the spring seat 45 is used for supporting the spring 44. Specifically, the spring seat 45 and the communication sleeve 46 are both hollow inside, and the communication sleeve 46 of the stroke valve 4 is fixed to the intermediate cylinder 62. The spring seat 45 is intended to act against the spring 44 for a good return after compression of the spring 44. The communication sleeve 46 serves to enable a sealed connection with the shock absorber 1.

The suspension system is optimized and improved on the basis of the shock absorber 1 and the air spring 2 of the existing vehicle; on the basis of a main oil passage 110 of the existing shock absorber 1 (the main oil passage of the application is a conventional structure of the shock absorber and is not described in detail in the application), a bypass oil passage 120 is additionally arranged; the bypass passage 120 directly communicates between the rod chamber 630 of the cylinder 63 and the bottom chamber 610 of the reservoir 61. Meanwhile, the air spring 2 is linked with the shock absorber 1, the air spring 2 is used as an opening adjusting structure of the shock absorber 1, the air spring 2 is used for sensing the change of external loads, the stroke valve 4 is driven by hydraulic oil of the hydraulic oil pipe 3, the opening size of the bypass oil passage 120 is changed, the damping characteristic of the shock absorber 1 is changed, and the shock absorber 1 is enabled to be more adaptive to external loads such as vehicle conditions. And the additional bypass oil passage 120 ensures that the damping adjustment performance range of the shock absorber 1 is larger, the adjustment is more flexible, and the performance is more excellent.

when the external load of the air spring 2 changes, the internal air pressure changes, and the sensing piston 210 moves upwards or downwards relative to the piston cavity 211;

the induction piston 210 drives the stroke valve 4 through hydraulic oil of the hydraulic oil pipe 3;

the opening degree of the bypass passage 120 is changed to be larger or smaller by the stroke valve 4;

the size of the oil passage of the shock absorber 1 changes, and the damping characteristic changes.

Specifically, when the internal air pressure of the air spring 2 becomes higher due to a change in external load, and the sensing piston 210 moves downward relative to the piston cavity 211, the hydraulic oil in the hydraulic oil tube 3 is squeezed, the plunger 43 is driven to slide toward the shock absorber 1, and the opening degree of the hydraulic oil passage 47 becomes smaller and even closed, so that the damping characteristic of the shock absorber changes, and the damping becomes larger. When the internal air pressure of the air spring 2 is reduced due to the change of the external load, the plunger 43 of the stroke valve 4 rebounds towards the air spring 2 under the action of the spring 44, presses the hydraulic oil in the hydraulic oil pipe 3, drives the induction piston 210 to move upwards relative to the piston cavity 211, and simultaneously the opening degree of the hydraulic oil channel 47 is increased until the induction piston is completely opened, at the moment, the damping characteristic of the shock absorber is changed, and the damping is reduced. According to the damping adjusting method, the change of external load is sensed through the air spring 2, the stroke valve 4 is driven through hydraulic oil of the hydraulic oil pipe 3, so that the opening degree of the bypass oil channel 120 is changed, the damping characteristic of the shock absorber 1 is changed, the shock absorber 1 is enabled to have stronger adaptability to external loads such as vehicle conditions and road conditions, the shock absorber 1 is enabled to have larger damping adjusting performance range, the shock absorber is adjusted more flexibly, and the performance is superior.

Preferably, the side wall of the rod cavity 630 is provided with an upper notch, the bottom cavity 610 is provided with a lower notch, and both the upper notch and the lower notch are communicated with the branch pipeline 12; the piston active height of the shock absorber 1 does not exceed the height of the upper notch. The piston of shock absorber 1 always moves between the upper indentation and the bottom of rod chamber 630.

In one embodiment, the suspension system comprises a shock absorber 1 and an air spring 2, wherein the shock absorber 1 comprises a storage cylinder 61 and a working cylinder 63, a branch pipeline 12 extending outwards is formed on the side wall of the storage cylinder 61, and a stroke valve 4 is arranged in the branch pipeline 12; the branch pipe 12 and the stroke valve 4 form a bypass passage 120 whose opening size can be changed; the bypass passage 120 communicates with the rod chamber 630 of the cylinder 63 and the bottom chamber 610 of the reservoir 61. The damping adjusting method is equivalent to that on the basis of the conventional shock absorber 1, a bypass oil passage 120 is newly opened, and the damping adjusting range of the shock absorber is enlarged in a phase-changing manner.

In one embodiment, a through piston cavity 211 is formed in the middle of the spring piston 22 of the air spring 2; an induction piston 210 is disposed within the piston cavity 211. A hydraulic oil pipe 3 filled with hydraulic oil is provided between the bottom of the piston cavity 211 and the stroke valve 4. When the air spring 2 works, the induction piston 210 drives the stroke valve 4 to change the opening degree of the bypass passage 120 through hydraulic oil. According to the damping adjusting method, the air spring 2 is used for sensing the change of the external load, the hydraulic oil of the hydraulic oil pipe 3 is used for driving the stroke valve 4, so that the opening size of the bypass oil channel 120 is changed, the damping characteristic of the shock absorber 1 is changed, the shock absorber 1 is higher in adaptability to external loads such as vehicle conditions and road conditions, and the market value is high.

Further, the air spring 2 includes an air bag body 21 and a spring piston 22, the top of the air bag body 21 is fixed to the vehicle body, and the bottom of the spring piston 22 is fixed to the suspension bracket. When the vehicle body moves relative to the suspension bracket in the moving process of the vehicle, the internal pressure of the air spring 2 changes, and the internal pressure can be sensitively reflected on the opening degree of the bypass passage 120 of the shock absorber 1. The piston cavity 211 comprises a large-diameter blind hole, the large-diameter blind hole comprises a small-diameter through hole, the small-diameter through hole is nested in the center of the large-diameter blind hole, a cylindrical protection wall with a corresponding size is arranged on the periphery of the small-diameter through hole, and the cylindrical protection wall is matched with the induction piston 210. The small-diameter through hole is connected with a hydraulic oil pipe 3. The inductive piston 210 includes a large cylindrical end that slides along the inner wall of the large-diameter blind hole, and a small cylindrical end that slides along the small-diameter through hole, the small cylindrical end being inserted into the cylindrical retaining wall. The spring piston 22 of this application structural design is ingenious, sets up a piston again in spring piston 22 is inside, under the prerequisite that does not change current air spring 2 structure, undercuts spring piston 22 part can realize with the linkage of hydraulic pressure oil pipe 3, simple structure, design benefit.

In one embodiment, the stroke valve 4 includes a bonnet 41, a valve body 42, a plunger 43, and a spring 44. The valve body 42 is fixed in the branch pipeline 12 in a sealing way; the valve cover 41 is disposed at the end of the branch pipe 12, and the central axes of the valve body 42 and the valve cover 41 are coaxial with the axis of the branch pipe 12. The outer diameter of the large-diameter section of the valve body 42 and the outer diameter of the valve cover 41 are both equal to the inner diameter of the branch pipe 12. The valve cover 41 is arranged opposite to the large-diameter section of the valve body 42 and forms an oil cavity 48, and the hydraulic oil pipe 3 passes through the valve cover 41 and is communicated with the oil cavity 48. The oil cavity 48 is filled with hydraulic oil, the plunger 43 is slidably disposed at the center of the valve body 42, and a hydraulic oil passage 47 is disposed at one end of the valve body 42 close to the shock absorber 1. A spring 44 for return is provided on the side of the plunger 43 facing the reservoir 61; the plunger 43 changes the opening degree of the hydraulic oil passage 47 by sliding.

According to the damping adjusting method, the air spring 2 is used as an opening adjusting structure of the shock absorber 1, the air spring 2 is used for sensing the change of external load, the stroke valve 4 is driven by hydraulic oil of the hydraulic oil pipe 3 through the change of the external load sensed by the air spring 2, so that the opening size of the bypass oil passage 120 is changed, the damping characteristic of the shock absorber 1 is changed, the shock absorber 1 is enabled to have stronger adaptability to external loads such as vehicle condition road conditions and the like, and the damping force is adjusted.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A suspension system of gas-liquid interconnection contains shock absorber (1) and air spring (2), its characterized in that:

the shock absorber (1) comprises an oil storage cylinder (61) and a working cylinder (63), a branch pipeline (12) extending outwards is formed in the side wall of the oil storage cylinder (61), and a stroke valve (4) is arranged in the branch pipeline (12); the branch pipeline (12) and the stroke valve (4) form a bypass oil channel (120) with changeable opening degree; the bypass oil passage (120) is communicated with a rod cavity (630) of the working cylinder (63) and a bottom cavity (610) of the oil storage cylinder (61);

a through piston cavity (211) is formed in the middle of a spring piston (22) of the air spring (2); an induction piston (210) is arranged in the piston cavity (211);

a hydraulic oil pipe (3) filled with hydraulic oil is arranged between the bottom of the piston cavity (211) and the stroke valve (4); when the air spring (2) works, the induction piston (210) drives the stroke valve (4) to change the opening degree of the bypass oil channel (120) through hydraulic oil;

the air spring (2) further comprises an airbag body (21), the top of the airbag body (21) is fixed on a vehicle body, and the bottom of the spring piston (22) is fixed on a suspension bracket; the piston cavity (211) comprises a large-diameter blind hole and a small-diameter through hole which are nested in a double-layer mode, and the small-diameter through hole is communicated with the hydraulic oil pipe (3); the induction piston (210) comprises a large cylindrical end and a small cylindrical end, the large cylindrical end slides along the inner wall of the large-diameter blind hole, and the small cylindrical end slides along the small-diameter through hole.

2. A gas-liquid interconnected suspension system according to claim 1 wherein: an upper notch is formed in the side wall of the rod cavity (630), a lower notch is formed in the bottom cavity (610), and the upper notch and the lower notch are communicated with the branch pipeline (12); the piston moving height of the shock absorber (1) does not exceed the height of the upper notch.

3. A gas-liquid interconnected suspension system according to claim 1 wherein: one end of the hydraulic oil pipe (3) is provided with a clamping sleeve joint (31), and the bottom of the small-diameter through hole is fixedly communicated with the clamping sleeve joint (31).

4. A gas-liquid interconnected suspension system as claimed in claim 1 wherein: the stroke valve (4) comprises a valve cover (41), a valve body (42), a plunger (43) and a spring (44);

the valve body (42) is fixed in the branch pipeline (12) in a sealing way; the valve cover (41) is arranged at the end part of the branch pipeline (12), an oil cavity (48) is formed at the position, opposite to the valve body (42), of the valve cover (41), and the hydraulic oil pipe (3) penetrates through the valve cover (41) and is communicated with the oil cavity (48);

the plunger (43) is slidably arranged in the center of the valve body (42), and one end, close to the shock absorber (1), of the valve body (42) is provided with a hydraulic oil channel (47); a spring (44) for resetting is arranged on one side of the plunger (43) facing the oil storage cylinder (61); the plunger (43) changes the opening degree of the hydraulic oil passage (47) by sliding.

5. A gas-liquid interconnected suspension system according to claim 4 wherein: the hydraulic oil channel (47) comprises more than three strip-shaped channels parallel to the plunger (43), and the more than three strip-shaped channels are uniformly arranged along the axial direction and the circumferential direction of the valve body (42).

6. A gas-liquid interconnected suspension system according to claim 4 wherein: the stroke valve (4) further comprises a spring seat (45) and a communication sleeve (46), the communication sleeve (46) is in butt joint with and fixed on a middle cylinder (62) of the shock absorber (1), and the spring seat (45) is used for abutting against the spring (44).

7. A damping adjustment method for a gas-liquid interconnected suspension system according to claim 1, comprising the steps of:

when the air spring (2) is subjected to external load change, the sensing piston (210) moves upwards or downwards relative to the piston cavity (211);

the induction piston (210) drives the stroke valve (4) through hydraulic oil of the hydraulic oil pipe (3);

the stroke valve (4) changes the opening degree of the bypass oil channel (120) to be larger or smaller;

the size of an oil channel of the shock absorber (1) changes, and the damping characteristic changes.

8. The damping adjustment method according to claim 7, characterized in that: an upper notch is formed in the side wall of the rod cavity (630), a lower notch is formed in the bottom cavity (610), and the upper notch and the lower notch are communicated with the branch pipeline (12); the piston moving height of the shock absorber (1) does not exceed the height of the upper notch.

9. The damping adjustment method according to claim 7, characterized in that: the stroke valve (4) comprises a valve cover (41), a valve body (42), a plunger (43) and a spring (44);

the valve body (42) is fixed on the branch pipeline (12) in a sealing way; the valve cover (41) is arranged at the end part of the branch pipeline (12), an oil cavity (48) is formed at the position, opposite to the valve body (42), of the valve cover (41), and the hydraulic oil pipe (3) penetrates through the valve cover (41) and is communicated with the oil cavity (48);