Compact rigidity damping inerter self-control type hydro-pneumatic spring and working method

Abstract

The invention discloses a compact rigidity damping inerter self-control type hydro-pneumatic spring and a working method. The bottom of the lower end of a plunger of a hollow structure is sealed, is downwards connected with a wheel and extends into an oil cylinder from bottom to top, the top of the upper end of the plunger is fixedly connected with a piston, and a row of plunger holes are formed in the upper portion of the plunger; the upper part of an upper cavity of the oil cylinder is sequentially connected with a damper and a small oil-gas chamber; the lower part of a lower cavity is sequentially connected with an inerter pipe, an adjustable throttle valve and a large oil-gas chamber; the upper end of the self-control device outer cylinder is fixedly connected with the piston; a self-control device inner barrel capable of moving up and down is coaxially sleeved in the self-control device outer barrel, the lower end of the self-control device inner barrel is sealed, and the upper section of the self-control device inner barrel is hinged to the oil cylinder upper end cover; an inner barrel upper row oil through hole formed in an inner barrel of the automatic control device is always located in an upper cavity of the oil cylinder, the upper edge of an inner barrel middle row oil through hole is aligned with the upper edge of an outer barrel upper row oil through hole, and the lower edge of an inner barrel lower row oil through hole is aligned with the lower edge of an outer barrel lower row oil through hole. The rigidity is changed, and the damping and the inerter can also be changed.

Description

Technical Field

[0001] The invention belongs to the technical field of automobiles, and relates to a suspension spring of an automobile, in particular to a stiffness damping inertia self-controlled oil-gas spring for automobile suspension and a working method thereof. Background Art

[0002] The suspension is an important structural and functional component of the automobile. It mainly attenuates the vibration transmitted from the wheels to the vehicle body when the vehicle is driving on a bad road, so that the passengers can enjoy good riding comfort. In order to provide good low-frequency and high-frequency vibration suppression effects of the vehicle body at the same time, the document with the patent application number CN2024112169851 and the name "Gradual-stiffness-increasing three-mass two-level vibration reduction graded control suspension and design and application" provides a gradual-stiffness-increasing spring driven by the suspension stroke with an air spring as the basic component and a stiffness control valve arranged between the airbag and the stiffness control air chamber. When the absolute value of the suspension dynamic stroke is less than or equal to a specific preset threshold, the stiffness control valve connects the airbag and the stiffness control air chamber, and the gradual-stiffness-increasing spring automatically provides a small stiffness; when the absolute value of the suspension dynamic stroke is greater than or equal to a specific preset threshold, the stiffness control valve disconnects the airbag and the stiffness control air chamber, and the gradual-stiffness-increasing spring automatically provides a large stiffness. The gradually increasing stiffness spring cooperates with a damper with large damping output to obtain a good low-frequency vibration suppression effect of the vehicle body. The gradually increasing stiffness spring cooperates with a damper with small damping output and a wheel dynamic vibration absorber to obtain a good high-frequency vibration suppression effect of the vehicle body. The gradually increasing stiffness spring automatically provides a large stiffness when the suspension is far away from the equilibrium position, automatically ensuring the stability of the vehicle body posture. However, the problems it has are: first, it cannot provide inertia, and cannot produce an anti-resonance function with a small stiffness when the suspension is in a balanced position, thereby failing to obtain the optimal high-frequency vibration suppression effect of the vehicle body, and failing to provide damping to more effectively constrain the dynamic travel of the suspension; second, the stiffness control valve it uses is large in size, has many parts, and is located outside the airbag, occupying the installation space of the suspension. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and provide a compact stiffness damping inertia self-controlled oil-gas spring and its working method which does not occupy the suspension installation space, has a small volume and can obtain the optimal vehicle body high-frequency vibration suppression effect.

[0004] To achieve the above-mentioned purpose, the present invention adopts a compact stiffness damping inertia self-controlled oil-gas spring adopts the following technical scheme: it includes an oil cylinder, the upper end of the oil cylinder is an oil cylinder upper end cover connected to the vehicle body, the piston divides the oil cylinder into two upper and lower chambers in the oil cylinder, and also includes a plunger of a hollow structure, the bottom of the lower end of which is sealed and connected to the wheel downward, extending into the oil cylinder from bottom to top, and the top of the upper end is fixedly connected to the piston, and a row of plunger holes is opened in the upper position; the upper part of the upper chamber of the oil cylinder is connected to the damper and the small oil-gas chamber outside the oil cylinder in sequence by the first hydraulic oil pipe, and the lower part of the lower chamber of the oil cylinder is connected to the inertia tube, the adjustable flow valve and the large oil-gas chamber outside the oil cylinder in sequence by the second hydraulic oil pipe; the outer cylinder of the automatic control device is located entirely at The upper end of the plunger is fixedly connected to the piston, and the lower end is suspended in the plunger; an inner cylinder of the automatic control device is coaxially sleeved in the outer cylinder of the automatic control device and can move up and down in the outer cylinder of the automatic control device, the lower end of the inner cylinder of the automatic control device is sealed, the lower section is located in the outer cylinder of the automatic control device, and the upper section passes through the piston upward and is hinged to the upper end cover of the cylinder; the inner cylinder of the automatic control device is provided with an upper row of oil holes in the inner cylinder, a middle row of oil holes in the inner cylinder and a lower row of oil holes in the inner cylinder, and the upper row of oil holes in the inner cylinder is always located in the upper chamber of the cylinder; the outer cylinder of the automatic control device is provided with an upper row of oil holes in the outer cylinder and a lower row of oil holes in the outer cylinder, the upper edge of the middle row of oil holes in the inner cylinder is aligned with the upper edge of the upper row of oil holes in the outer cylinder, and the lower edge of the lower row of oil holes in the inner cylinder is aligned with the lower edge of the lower row of oil holes in the outer cylinder.

[0005] The working method of a compact stiffness damping inertia self-controlled oil-gas spring of the present invention adopts the following technical scheme:

[0006] When the vehicle body moves upward and away from the wheels, the inner cylinder of the automatic control device moves upward relative to the outer cylinder of the automatic control device, and the volume of the upper chamber of the oil cylinder increases. When the lower edge of the oil hole in the middle of the inner cylinder is not higher than the upper edge of the oil hole in the upper row of the outer cylinder, most of the hydraulic oil flows from the large oil and gas chamber through the adjustable flow valve and the inertia tube into the lower chamber of the oil cylinder, and then flows into the hollow chamber of the plunger through the plunger hole, and flows into the upper oil hole of the outer cylinder, the middle oil hole of the inner cylinder, the inside of the inner cylinder, and the upper oil hole of the inner cylinder. The upper chamber of the oil cylinder, and at the same time, a small part of the hydraulic oil flows into the oil cylinder from the small oil and gas chamber through the damper. The large oil and gas chamber mainly provides smaller stiffness, and the adjustable flow valve and the inertia tube provide smaller damping and smaller inertia respectively; on the contrary, when the lower edge of the oil-through hole in the inner cylinder is higher than the upper edge of the oil-through hole on the outer cylinder of the cylindrical stiffness automatic control device, there is no hydraulic oil circulation between the outer cylinder of the automatic control device and the inner cylinder of the automatic control device, and the small oil and gas chamber mainly provides greater stiffness, and the damper provides greater damping.

[0007] When the vehicle body moves downward toward the wheel, the inner cylinder of the automatic control device moves downward relative to the outer cylinder of the automatic control device, and the volume of the upper chamber of the oil cylinder becomes smaller. When the upper edge of the lower oil hole of the inner cylinder is not lower than the lower edge of the lower oil hole of the outer cylinder, most of the hydraulic oil flowing out from the upper chamber of the oil cylinder flows from the upper chamber of the oil cylinder through the upper oil hole of the inner cylinder, the inside of the inner cylinder of the automatic control device, the lower oil hole of the inner cylinder, and the lower oil hole of the outer cylinder into the hollow chamber of the plunger, and then flows from the plunger hole into the lower chamber of the oil cylinder, and then flows through the large oil and gas chamber through the inertia tube and the adjustable flow valve. At the same time, a small amount of hydraulic oil flows from the upper chamber of the oil cylinder through the damper into the small oil and gas chamber. The large oil and gas chamber mainly provides smaller stiffness, and the adjustable flow valve and the inertia tube provide smaller damping and smaller inertia respectively. On the contrary, when the lower edge of the lower oil hole of the inner cylinder is lower than the lower edge of the lower oil hole of the outer cylinder, the small oil and gas chamber provides greater stiffness, and the damper provides greater damping.

[0008] The beneficial effects of the present invention after adopting the above technical solution are:

[0009] Compared with the stiffness control valve of the stiffness increasing spring provided in the document with patent application number CN2024112169851, the present invention mainly has the following differences: 1) The double-cylinder stiffness automatic control device adopts an inner and outer cylinder structure, rather than an outer valve body and an inner rod body structure, so there is no need to connect an oil pipe separately; 2) Three rows and two rows of oil holes are respectively arranged on the inner and outer cylinders of the double-cylinder stiffness automatic control device, instead of three holes and one groove on the valve body and two grooves on the valve core like the stiffness control valve. It can be seen that the present invention can improve the oil flow rate. efficiency; 3) the inner and outer cylinders of the double-cylinder stiffness automatic control device do not require a spring or other return device between the valve body and the valve core as in the stiffness control valve, so the structure is simple and has fewer parts; 4) the double-cylinder stiffness automatic control device is located inside the plunger, so there is no need to set a sealing device like the valve body and valve core located outside; 5) in addition to changing the stiffness, the present invention can also change the damping and inertia, and has better performance improvement capabilities; 6) the double-cylinder stiffness control device has a simpler structure and is located inside the plunger, and will not occupy additional suspension installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of a compact stiffness damping inertia self-controlled oil-gas spring of the present invention;

[0011] In the figure: 1. Cylinder; 1-1. Cylinder upper end cover; 2. Piston; 3. Plunger; 3-1. Plunger hole; 4. Automatic control device outer cylinder; 4-1. Upper row of oil holes in outer cylinder; 4-2. Lower row of oil holes in outer cylinder; 5. Inertia tube; 6. Adjustable flow valve; 7. Large oil and gas chamber; 8. Small oil and gas chamber; 9. Damper; 10. Automatic control device inner cylinder; 10-1. Lower row of oil holes in inner cylinder; 10-2. Middle row of oil holes in inner cylinder; 10-3. Lower row of oil holes in inner cylinder; 11. Ball joint. DETAILED DESCRIPTION

[0012] See also Figure 1 The compact stiffness damping inertia self-controlled oil-gas spring of the present invention is composed of an oil cylinder 1, a piston 2, a plunger 3, a double-tube stiffness damping self-controlled device, an inertia tube 5, an adjustable flow valve 6, a large oil-gas chamber 7, a small oil-gas chamber 8, a damper 9, and a ball joint 11. The double-tube stiffness damping self-controlled device is composed of an outer tube 4 of the self-controlled device and an inner tube 10 of the self-controlled device.

[0013] The oil cylinder 1 is located above the plunger 3, and the upper end of the oil cylinder 1 is the oil cylinder upper end cover 1-1. The oil cylinder 1 is connected to the vehicle body upward through the oil cylinder upper end cover 1-1. The plunger 3 is a hollow structure with a sealed bottom. A row of plunger holes 3-1 is opened at the upper position. The row of plunger holes 3-1 is a plurality of holes opened at equal heights on the side wall of the plunger 3 in the circumferential direction. Under the condition of ensuring strength, the sum of the hole areas of a row of plunger holes 3-1 is as large as possible. The plunger 3 extends into the oil cylinder 1 from bottom to top, and the piston 2 is inside the oil cylinder 1, dividing the oil cylinder 1 into two upper and lower chambers. The piston 2 can move up and down along the inner wall of the oil cylinder 1. The bottom of the lower end of the plunger 3 is downwardly connected to the wheel, and the top of the upper end of the plunger 3 is fixedly connected to the piston 2 and moves synchronously with the plunger 3. The upper part of the upper chamber of the oil cylinder 1 is connected to the damper 9 and the small oil and gas chamber 8 outside the oil cylinder 1 in sequence through the first hydraulic oil pipe, and the lower part of the lower chamber of the oil cylinder 1 is connected to the inertia pipe 5, the adjustable flow valve 6 and the large oil and gas chamber 7 outside the oil cylinder 1 in sequence through the second hydraulic oil pipe. The volume of the large oil and gas chamber 7 is greater than that of the small oil and gas chamber 8.

[0014] The double-tube damping stiffness automatic control device is arranged inside the oil cylinder 1 and the plunger 3, wherein the outer tube 4 of the automatic control device is entirely located inside the plunger 3, the upper end of the outer tube 4 of the automatic control device is fixedly connected upward to the plunger piston 2, and the lower end of the outer tube 4 of the automatic control device is suspended in the plunger 3. An inner tube 10 of the automatic control device is coaxially sleeved in the outer tube 2 of the automatic control device, the lower section of the inner tube 10 of the automatic control device is located in the outer tube 4 of the automatic control device, and the inner tube 10 of the automatic control device can move up and down in the outer tube 4 of the automatic control device along the axial direction. The upper section of the inner tube 10 of the automatic control device passes through the piston 2 upward and extends into the upper chamber of the oil cylinder 1, and the upper end of the inner tube 10 of the automatic control device is hinged to the upper end cover 1-1 of the oil cylinder. The upper end of the inner tube 10 of the automatic control device of the present invention is connected upward to the upper end cover 1-1 of the oil cylinder by a ball joint 11. The lower end of the inner tube 10 of the automatic control device should be sealed and can extend below the outer tube 4 of the automatic control device. The inner cylinder 10 of the automatic control device is provided with three rows of oil holes at different heights from top to bottom. Under the condition of ensuring strength, the sum of the hole areas of a row of holes at the same height is as large as possible.

[0015] The three rows of oil holes on the inner cylinder 10 of the automatic control device are the upper row of oil holes 10-1, the middle row of oil holes 10-2 and the lower row of oil holes 10-3, wherein the upper row of oil holes 10-1 is always located in the upper chamber of the oil cylinder 1, the middle row of oil holes 10-2 and the lower row of oil holes 10-3 are long strip holes in the height direction, and the long sides of the long strip holes are arranged along the height direction. Under the condition of ensuring strength, the larger the sum of the hole areas of a row of holes at the same height of the inner cylinder 10 of the automatic control device, the better.

[0016] Two rows of oil holes are formed on the outer cylinder 4 of the automatic control device, namely, the upper row of oil holes 4-1 and the lower row of oil holes 4-2. Under the condition of ensuring strength, the sum of the hole areas of a row of holes at the same height is as large as possible. The upper edge of the middle row of oil holes 10-2 in the inner cylinder is aligned with the upper edge of the upper row of oil holes 4-1 in the outer cylinder, and the lower edge of the lower row of oil holes 10-3 in the inner cylinder is aligned with the lower edge of the lower row of oil holes 4-2 in the outer cylinder. The row of oil holes described in the present invention refers to a plurality of holes formed at equal heights on the side wall of the outer cylinder or the inner cylinder along the circumferential direction.

[0017] When the vehicle body moves upward and away from the wheel, the inner cylinder 10 of the automatic control device moves upward relative to the outer cylinder 4 of the automatic control device fixed on the piston 2 through the upper end cover 1-1 of the cylinder and the ball joint 11. At this time, the volume of the upper chamber of the cylinder 1 increases. When the lower edge of the oil hole 10-2 in the inner cylinder is not higher than the upper edge of the oil hole 4-1 in the outer cylinder, most of the hydraulic oil filling the increased volume of the upper chamber of the cylinder 1 flows from the large oil and gas chamber 7 through the adjustable flow valve 6 and the inertia pipe 5 into the cylinder 1, and then flows into the hollow chamber of the plunger 3 through the plunger hole 3-1, and then flows into the upper chamber of the cylinder 1 through the upper oil holes 4-1 of the outer cylinder, the middle oil holes 10-2 of the inner cylinder, the inside of the inner cylinder 10, and the upper oil holes 10-1 of the inner cylinder. At the same time, a small part of the hydraulic oil flows into the cylinder 1 from the small oil and gas chamber 8 through the damper 9. At this time, the large oil and gas chamber 7 mainly works to provide small stiffness, and the adjustable flow valve 6 and the inertia tube 5 work to provide small damping and small inertia respectively. On the contrary, when the lower edge of the oil holes 10-2 in the inner cylinder is higher than the upper edge of the oil holes 4-1 in the outer cylinder of the cylindrical stiffness automatic control device, no hydraulic oil flows between the outer cylinder 4 and the inner cylinder 10 of the automatic control device, and all the hydraulic oil that fills the increased volume of the upper chamber of the cylinder 1 flows from the small oil and gas chamber 7 through the damper 9 into the upper chamber of the cylinder 1. This process is mainly due to the small oil and gas chamber 8 providing greater stiffness and the damper 9 providing greater damping.

[0018] When the vehicle body moves downward toward the wheel, the inner cylinder 10 of the automatic control device moves downward relative to the outer cylinder 4 of the automatic control device fixed on the piston 2 through the upper end cover 1-1 of the cylinder and the ball joint 11. At this time, the volume of the upper chamber of the cylinder 1 decreases. When the upper edge of the lower row of oil holes 10-3 of the inner cylinder is not lower than the lower edge of the lower row of oil holes 4-2 of the outer cylinder, most of the hydraulic oil flowing out of the upper chamber of the cylinder 1 flows from the upper chamber of the cylinder 1 through the upper row of oil holes 10-1 of the inner cylinder, the inside of the inner cylinder 10 of the automatic control device, The oil through hole 10-3 of the lower row of the inner cylinder and the oil through hole 4-2 of the lower row of the outer cylinder 4 of the automatic control device flow into the hollow chamber of the plunger 3, and then flow into the lower chamber of the oil cylinder 1 from the plunger hole 3-1, and then flow through the large oil and gas chamber 7 through the inertia tube 5 and the adjustable flow valve 6. At the same time, a small part of the hydraulic oil flows from the upper chamber of the oil cylinder 1 through the damper 9 into the small oil and gas chamber 8. This process is mainly provided by the large oil and gas chamber 7 to provide a small rigidity, and the adjustable flow valve 6 and the inertia tube 5 work to provide a small damping and a small inertia respectively. When the lower edge of the lower row of oil through holes 10-3 of the inner cylinder is lower than the lower edge of the lower row of oil through holes 4-2 of the outer cylinder, there is no hydraulic oil circulation between the outer cylinder 4 of the automatic control device and the inner cylinder 10 of the automatic control device, and all the hydraulic oil flowing out of the upper chamber of the oil cylinder 1 flows into the small oil and gas chamber 8 through the damper 9. This process is mainly provided by the small oil and gas chamber 8 to provide a large rigidity, and the damper 9 provides a large damping.

[0019] The height dimensions (i.e., hole length) of the inner cylinder oil hole 10-2 and the inner cylinder lower oil hole 10-3 are equal to the threshold of the suspension stroke for improving the ride comfort of the vehicle, and the distance between the upper edges of the inner cylinder oil hole 10-2 and the inner cylinder lower oil hole 10-3 is slightly greater than the suspension limit stroke.

[0020] When the oil-gas spring provided by the present invention is used, when the suspension stroke does not exceed the suspension stroke threshold for improving the ride comfort of the automobile, the large oil-gas chamber 7 mainly works to provide a smaller stiffness, the adjustable throttle valve 6 works to provide a smaller damping, and the inertia tube 5 works to provide a smaller inertia. The smaller stiffness and the smaller inertia together produce high-frequency anti-resonance vibration reduction, and together with the smaller stiffness vibration isolation, the high-frequency vibration of the vehicle body is greatly reduced, so that the vehicle obtains better ride comfort. When the suspension stroke exceeds the suspension stroke threshold for improving the ride comfort of the automobile, the small oil-gas chamber 8 works to provide a larger stiffness, and the damper 9 works to provide a larger stiffness to constrain the suspension dynamic stroke, so that the vehicle takes into account both the stability of the vehicle body posture and the avoidance of the suspension limit from being hit.

[0021] Since the hydraulic oil flow between the oil cylinder 1 and the plunger 3 of the oil-gas spring provided by the present invention is controlled by the suspension dynamic stroke driven double-tube damping type stiffness automatic control device, when the suspension dynamic stroke is greater than or less than the suspension stroke threshold for improving the ride comfort of the vehicle, the output stiffness, damping and inertia are automatically changed without the need for additional sensors and controllers. For this reason, the oil-gas spring provided by the present invention is named a stiffness damping inertia automatic control oil-gas spring.

Claims

1. A compact stiffness damping inertia self-controlled oil-gas spring, comprising an oil cylinder (1), the upper end of the oil cylinder (1) is an oil cylinder upper end cover (1-1) connected to a vehicle body, a piston (2) in the oil cylinder (1) divides the oil cylinder (1) into two upper and lower chambers, characterized in that: It also includes a plunger (3) with a hollow structure, the bottom of which is sealed and connected downwardly to the wheel, extending upwardly into the oil cylinder (1), and the top of which is fixedly connected to the piston (2), and a row of plunger holes (3-1) are opened at the upper position; The upper part of the upper chamber of the oil cylinder (1) is connected in sequence to a damper (9) and a small oil-gas chamber (8) outside the oil cylinder (1) by a first hydraulic oil pipe, and the lower part of the lower chamber of the oil cylinder (1) is connected in sequence to an inertia tube (5), an adjustable flow valve (6) and a large oil-gas chamber (7) outside the oil cylinder (1) by a second hydraulic oil pipe; The outer cylinder (4) of the automatic control device is entirely located in the plunger (3), the upper end of which is fixedly connected to the piston (2) and the lower end of which is suspended in the plunger (3); an inner cylinder (10) of the automatic control device is coaxially sleeved in the outer cylinder (4) of the automatic control device and can move up and down in the outer cylinder (4) of the automatic control device; the lower end of the inner cylinder (10) of the automatic control device is sealed, the lower section is located in the outer cylinder (4) of the automatic control device, and the upper section passes through the piston (2) upwards and is hinged to the upper end cover (1-1) of the oil cylinder; The inner cylinder (10) of the automatic control device is provided with an inner cylinder upper row of oil holes (10-1), an inner cylinder middle row of oil holes (10-2) and an inner cylinder lower row of oil holes (10-3), and the inner cylinder upper row of oil holes (10-1) is always located in the upper chamber of the oil cylinder (1); the outer cylinder (4) of the automatic control device is provided with an outer cylinder upper row of oil holes (4-1) and an outer cylinder lower row of oil holes (4-2); the upper edge of the inner cylinder middle row of oil holes (10-2) is aligned with the upper edge of the outer cylinder upper row of oil holes (4-1), and the lower edge of the inner cylinder lower row of oil holes (10-3) is aligned with the lower edge of the outer cylinder lower row of oil holes (4-2).

2. A compact stiffness damping inertia self-controlled oil-gas spring according to claim 1, characterized in that: The oil through holes (10-2) in the middle row of the inner cylinder and the oil through holes (10-3) in the lower row of the inner cylinder are long strip holes, and the long sides of the long strip holes are along the height direction.

3. A compact stiffness damping inertia self-controlled oil-gas spring according to claim 1, characterized in that: The upper section of the inner cylinder (10) of the automatic control device is hinged to the upper end cover (1-1) of the oil cylinder by using a ball joint (11).

4. A compact stiffness damping inertia self-controlled oil-gas spring according to claim 1, characterized in that: The lower end of the inner cylinder (10) of the automatic control device extends below the outer cylinder (4) of the automatic control device.

5. The compact stiffness damping inertia self-controlled oil-gas spring according to claim 1, characterized in that: Under the condition of ensuring strength, the sum of the hole areas of a row of plunger holes (3-1) on the plunger (3) is as large as possible.

6. The compact stiffness damping inertia self-controlled oil-gas spring according to claim 1, characterized in that: Under the condition of ensuring strength, the sum of the hole areas of a row of holes on the same height of the automatic control device inner cylinder (10) and the automatic control device outer cylinder (4) is as large as possible.

7. The compact stiffness damping inertia self-controlled oil-gas spring according to claim 2, characterized in that: The inner cylinder middle oil through hole (10-2) and the inner cylinder lower oil through hole (10-3) on the inner cylinder (10) of the automatic control device have a hole length in height equal to a threshold value of suspension travel for improving the riding comfort of the automobile.

8. The compact stiffness damping inertia self-controlled oil-gas spring according to claim 1, characterized in that: The distance between the upper edge of the oil through hole (10-2) in the inner cylinder and the upper edge of the oil through hole (10-3) below the inner cylinder is greater than the suspension limit stroke.

9. A method for operating a compact stiffness damping inertia self-controlled oil-gas spring according to any one of claims 1 to 8, characterized in that: When the vehicle body moves upward and away from the wheels, the inner cylinder (10) of the automatic control device moves upward relative to the outer cylinder (4) of the automatic control device, and the volume of the upper chamber of the oil cylinder (1) increases. When the lower edge of the oil holes (10-2) in the middle of the inner cylinder is not higher than the upper edge of the oil holes (4-1) in the upper of the outer cylinder, most of the hydraulic oil flows from the large oil and gas chamber (7) through the adjustable flow valve (6) and the inertia tube (5) into the lower chamber of the oil cylinder (1), and then flows into the hollow chamber of the plunger (3) through the plunger hole (3-1), and flows through the upper oil holes (4-1) in the outer cylinder, the oil holes (10-2) in the middle of the inner cylinder, the inside of the inner cylinder (10), and the upper oil holes (4-1) in the inner cylinder. 10-1) flows into the upper chamber of the oil cylinder (1), and at the same time, a small amount of hydraulic oil flows into the oil cylinder (1) from the small oil and gas chamber (8) through the damper (9), mainly provided by the large oil and gas chamber (7) with smaller rigidity, and the adjustable flow valve (6) and the inertia tube (5) provide smaller damping and smaller inertia respectively; on the contrary, when the lower edge of the row of oil holes (10-2) in the inner cylinder is higher than the upper edge of the row of oil holes (4-1) in the outer cylinder of the cylinder-type rigidity automatic control device, no hydraulic oil flows between the outer cylinder (4) of the automatic control device and the inner cylinder (10) of the automatic control device, mainly provided by the small oil and gas chamber (8) with larger rigidity, and the damper (9) with larger damping.

10. A method for operating the compact stiffness damping inertia self-controlled oil-gas spring according to any one of claims 1 to 8, characterized in that: When the vehicle body moves downward toward the wheel, the inner cylinder (10) of the automatic control device moves downward relative to the outer cylinder (4) of the automatic control device, and the volume of the upper chamber of the oil cylinder (1) decreases. When the upper edge of the lower row of oil holes (10-3) of the inner cylinder is not lower than the lower edge of the lower row of oil holes (4-2) of the outer cylinder, most of the hydraulic oil flowing out of the upper chamber of the oil cylinder (1) flows from the upper chamber of the oil cylinder (1) through the upper row of oil holes (10-1) of the inner cylinder, the interior of the inner cylinder (10) of the automatic control device, the lower row of oil holes (10-3) of the inner cylinder, and the lower row of oil holes (4-2) of the outer cylinder into the hollow chamber of the plunger (3), and then flows out from the plunger hole (3- 1) flows into the lower chamber of the oil cylinder (1), then flows through the large oil and gas chamber (7) through the inertia tube (5) and the adjustable flow valve (6), and at the same time a small portion of the hydraulic oil flows from the upper chamber of the oil cylinder (1) through the damper (9) into the small oil and gas chamber (8), with the large oil and gas chamber (7) providing a smaller rigidity, and the adjustable flow valve (6) and the inertia tube (5) providing a smaller damping and a smaller inertia respectively; on the contrary, when the lower edge of the lower row of oil holes (10-3) of the inner cylinder is lower than the lower edge of the lower row of oil holes (4-2) of the outer cylinder, the small oil and gas chamber (8) provides a larger rigidity, and the damper (9) provides a larger damping.

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