Safety redundant hydro-pneumatic spring device for heavy vehicle

Abstract

The invention belongs to the technical field of vehicle damping, and particularly relates to a heavy vehicle safety redundancy hydro-pneumatic spring device which comprises an upper lug ring, an inflation valve, an outer cylinder body, a screw plug, an integrated piston rod, a sealing end cover and an inner cylinder body. The inner cylinder body and the outer cylinder body are respectively connected with the upper lug ring; the integrated piston rod is located between the outer cylinder body and the inner cylinder body. The sealing end cover is located between the inner cylinder body and the integrated piston rod and connected with the inner cylinder body, and a fourth oil cavity is defined by the sealing end cover and the integrated piston rod. The integrated piston rod and the outer cylinder body are both provided with oil ways, air channels are formed in the center and one side of the upper lug ring, and the fourth oil cavity exchanges oil with the outside through the oil ways on the integrated piston rod. The safety of the vehicle in the driving process is guaranteed by designing a redundant device; each wheel of the heavy vehicle is provided with the heavy vehicle safety redundancy hydro-pneumatic spring device, loads in the vehicle running process are supported, vehicle running impact is absorbed, and stability is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of vehicle shock absorption, and specifically relates to a safety redundant oil-gas spring device for heavy vehicles. Background Art

[0002] Gas springs are hydraulic components specifically designed to support the chassis of heavy vehicles. They support the vehicle body through their own rigidity and reduce vehicle vibration through their own damping, ensuring the normal operation of heavy vehicles on complex roads. However, under the alternating loads caused by complex roads, gas springs are prone to seal failure, affecting the safe operation of heavy vehicles. Summary of the Invention

[0003] In response to the above shortcomings, this application proposes a heavy-duty vehicle safety redundant oil-gas spring device to solve the problem of poor safety of oil-gas springs in the suspension system. Its technical solution is: A heavy-duty vehicle safety redundant oil-gas spring device comprises an upper earring, an inflation valve, an outer cylinder, a screw plug, an integrated piston rod, a sealing end cover, and an inner cylinder; the inner cylinder and the outer cylinder are respectively fixedly connected to the upper earring; the integrated piston rod is located between the outer cylinder and the inner cylinder; the sealing end cover is located between the inner cylinder and the integrated piston rod, and one end face of the sealing end cover is fixedly connected to the inner cylinder; the sealing end cover and the integrated piston rod enclose a fourth oil chamber, and the integrated piston rod and the outer cylinder are both provided with oil passages; air passages are opened at the center and one side of the upper earring; the fourth oil chamber exchanges oil with the outside through the oil passage on the integrated piston rod; A built-in accumulator 1 is provided inside the inner cylinder body, and a built-in accumulator 2 is provided in an annular cavity surrounded by the outer wall of the inner cylinder body, the inner wall of the outer cylinder body, the end face of one side of the integrated piston rod and the end face of the upper earring; the built-in accumulator 1 exchanges gas with the outside through the inflation valve at the center position of the upper earring; the built-in accumulator 2 exchanges gas with the outside through the inflation valve at one side position of the upper earring.

[0004] Preferably, the built-in accumulator 1 includes an inner floating piston, which is located in the inner cylinder body and divides the inner cylinder body into a third oil chamber and a first air chamber, and the first air chamber performs gas exchange through an inflation valve provided at the center position of the upper earring; the built-in accumulator 2 includes an outer floating piston, which is located in an annular cavity formed by the outer wall of the inner cylinder body, the inner wall of the outer cylinder body, the end face of one side of the integrated piston rod and the end face of the upper earring, and divides it into a first oil chamber and a second air chamber, and the second air chamber performs gas exchange through an inflation valve provided at one side position of the upper earring.

[0005] Preferably, the built-in accumulator 1 includes a second airbag, which is located in the inner cylinder body, and the outer wall of the second airbag, the inner wall of the inner cylinder body and the inner end face of the sealing end cover form a sixth oil chamber, and the second airbag exchanges gas through an inflation valve provided at the center position of the upper earring; the built-in accumulator 2 includes a first airbag, which is located in an annular cavity formed by the outer wall of the inner cylinder body, the inner wall of the outer cylinder body, the end face of one side of the integrated piston rod and the end face of the upper earring, and the outer wall of the first airbag, the outer wall of the inner cylinder body, the inner wall of the outer cylinder body, the end face of one side of the integrated piston rod and the end face of the upper earring form a fifth oil chamber, and the first airbag exchanges gas through an inflation valve provided at one side of the upper earring.

[0006] Preferably, the integrated piston rod includes an earring structure, a rod structure, and a piston structure; the earring structure is connected to the vehicle wheel, the rod structure connects the earring structure and the piston structure and is arranged between the outer cylinder body and the inner cylinder body, and the piston structure is arranged between the outer cylinder body and the inner cylinder body.

[0007] Preferably, the sealing end cover is provided with a third damping hole, a fourth damping hole and a second one-way valve; the piston structure in the integrated piston rod is provided with a second damping hole, a first one-way valve and a first damping hole; wherein the fourth damping hole is connected in series with the second one-way valve and the first damping hole is connected in series with the first one-way valve.

[0008] Preferably, before the heavy vehicle safety redundant oil-gas spring device works, oil is injected into the first oil chamber, the second oil chamber, the third oil chamber, and the fourth oil chamber through the oil circuit, and nitrogen is injected into the first air chamber and the second air chamber through the inflation valve.

[0009] Preferably, before the heavy vehicle safety redundant oil-gas spring device works, oil is filled into the second oil chamber, the fourth oil chamber, the fifth oil chamber and the sixth oil chamber through the oil circuit, and nitrogen is filled into the first airbag and the second airbag through the inflation valve.

[0010] Preferably, when the integrated piston rod is compressed, the volumes of the first oil chamber and the fourth oil chamber are reduced, and the oil passes through the second damping hole, the first damping hole and the first one-way valve of the integrated piston rod piston structure, the third damping hole, the fourth damping hole and the second one-way valve of the sealing end cover, and then flows into the second oil chamber and the third oil chamber respectively. Since the reduction in the oil in the first oil chamber and the fourth oil chamber is equal to the increase in the oil in the second oil chamber and the third oil chamber respectively, the outer floating piston and the inner floating piston compress the nitrogen in the second air chamber and the first air chamber respectively, thereby generating an elastic buffering effect. Since the oil can pass through the first one-way valve and the first damping hole, the second one-way valve and the fourth damping hole during the compression process, the oil flowing through the damping hole generates a smaller damping force, and the support and buffering effect is good.

[0011] Preferably, when the integrated piston rod is stretched, the volumes of the first oil chamber and the fourth oil chamber increase, and the oil is supplemented by the oil in the second oil chamber and the third oil chamber. At this time, the oil passes through the second damping hole of the integrated piston rod piston structure and the third damping hole of the sealing end cover, and then flows into the first oil chamber and the fourth oil chamber respectively; the increase in the oil in the first oil chamber and the fourth oil chamber is equal to the decrease in the oil in the second oil chamber and the third oil chamber, respectively. At this time, the nitrogen in the outer floating piston and the inner floating piston expands. Since the integrated piston rod piston structure and the one-way valve of the sealing end cover are in a closed state during the stretching process, the oil flows through the damping hole to generate a larger damping force.

[0012] Preferably, the upper earring, the second air chamber, the outer floating piston, the first oil chamber, the second oil chamber, the outer cylinder body, the integrated piston rod, the inner cylinder body, the internal gas-liquid and the corresponding inflation valve constitute the first set of devices; the upper earring, the integrated piston rod, the sealing end cover, the inner cylinder body, the third oil chamber, the fourth oil chamber, the first air chamber, the internal gas-liquid and the corresponding inflation valve constitute the second set of devices; the oil between the two sets of devices is sealed by the sealing end cover; only when the seal of the first set of devices fails, the oil will leak between the first oil chamber and the second oil chamber, causing the first set of devices to work abnormally, but because the seal between the two sets of devices is normal, the oil cannot leak into the fourth oil chamber, and the oil is still sealed without leakage, so the second set of devices can operate independently and function; only when the sealing effect of the second set of devices fails, the oil flows from the fourth oil chamber into the first oil chamber through the sealing end cover, and the oil amount in the first oil chamber increases at this time, but because the seal of the first set of devices is normal, it can still function, so the oil-gas spring will fail only when both sets of devices have abnormal seals.

[0013] Compared with the prior art, this application has the following beneficial effects: The heavy-duty vehicle safety redundant oil-gas spring device of the present invention has two sets of independent devices, and the redundant devices are used to improve the working reliability of the oil-gas spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 An isometric view of a redundant oil-gas spring assembly for heavy vehicle safety; Figure 2 Another isometric view of a redundant oil-gas spring device for heavy vehicle safety; Figure 3 A top view of the redundant oil and gas spring device for heavy vehicle safety; Figure 4 This is a cross-sectional view of the AA position of the scheme 1 for the safety redundant oil-gas spring device for heavy vehicles; Figure 5 This is a cross-sectional view of the AA position of the second scheme of the safety redundant oil-gas spring device for heavy vehicles; In the picture: Upper earring; 2-inflating valve; 3-outer cylinder; 4-first air chamber; 5-screw plug; 6-second oil chamber; 7-third oil chamber; 8-fourth oil chamber; 9-integrated piston rod; 10-first airbag; 11-fifth oil chamber; 12-sixth oil chamber; 13-second air chamber; 14-outer floating piston; 15-first oil chamber; 16-inner floating piston; 17-second airbag; 18-sealing end cap; 19-inner cylinder; 20-first damping orifice; 21-first one-way valve; 22-second damping orifice; 23-third damping orifice; 24-second one-way valve; 25-fourth damping orifice; DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0016] A heavy-duty vehicle safety redundant oil-gas spring device comprises an upper earring 1, an inflation valve 2, an outer cylinder body 3, a screw plug 5, an integrated piston rod 9, a sealing end cover 18, and an inner cylinder body 19; the inner cylinder body 19 and the outer cylinder body 3 are respectively fixedly connected to the upper earring 1; the integrated piston rod 9 is located between the outer cylinder body 3 and the inner cylinder body 19; the sealing end cover 18 is located between the inner cylinder body 19 and the integrated piston rod 9, and one end face thereof is fixedly connected to the inner cylinder body 19; the sealing end cover 18 and the integrated piston rod 9 form a fourth oil chamber 8, and oil circuits are provided on the integrated piston rod 9 and the outer cylinder body 3; air passages are opened in the center and on one side of the upper earring 1; the fourth oil chamber 8 exchanges oil with the outside through the oil circuit on the integrated piston rod 9.

[0017] A built-in accumulator 1 is provided inside the inner cylinder body 19, and a built-in accumulator 2 is provided in the annular cavity surrounded by the outer wall of the inner cylinder body 19, the inner wall of the outer cylinder body 3, the end face of one side of the integrated piston rod 9 and the end face of the upper earring 1; the built-in accumulator 1 exchanges gas with the outside through the inflation valve 2 at the center position of the upper earring 1; the built-in accumulator 2 exchanges gas with the outside through the inflation valve 2 at one side position of the upper earring 1.

[0018] The present invention is a safety redundant oil and gas spring device for heavy vehicles.

[0019] The invention aims to achieve this through a heavy-duty vehicle redundant oil-pneumatic spring device: By equipping each wheel with a heavy-duty vehicle redundant oil-pneumatic spring device, the device supports vehicle load, absorbs shock, and improves comfort. This redundant device ensures the safety of the heavy-duty vehicle oil-pneumatic suspension and reduces the probability of suspension failure.

[0020] The heavy-duty vehicle safety redundant oil-gas spring device of the present invention provides two inventive solutions for achieving the design goal.

[0021] For option one: The device includes an upper earring 1, an inflation valve 2, an outer cylinder 3, a screw plug 5, an integrated piston rod 9, an outer floating piston 14, an inner floating piston 16, a sealing end cover 18, and an inner cylinder 19. The annular structure of the upper earring 1 is connected to the body of the vehicle; the inflation valve 2 is installed in the inflation channel of the upper earring 1; the plug screw 5 is respectively installed in the oil circuit of the outer cylinder body 3 and the integrated piston rod 9; one end of the outer cylinder body 3 and one end of the inner cylinder body 19 are respectively fixedly connected to the upper earring 1; the integrated piston rod 9 has an earring structure, a rod structure, and a piston structure. The earring structure is connected to the vehicle wheel, the rod structure connects the earring structure and the piston structure and is arranged between the outer cylinder body 3 and the inner cylinder body 19, and the piston structure is arranged between the outer cylinder body 3 and the inner cylinder body 19; the sealing end cover 18 is fixedly connected to the other end of the inner cylinder body 19, and the side is located between the inner cylinder body 19 and the integrated piston rod 9; the inner floating piston 16 is floatingly arranged in the internal cavity of the inner cylinder body 19; the outer floating piston 14 is arranged in an annular cavity surrounded by the outer cylinder body 3, the inner cylinder body 19, the upper earring 1, and the integrated piston rod 9.

[0022] The built-in accumulator 1 includes an inner floating piston 16, which is located in the inner cylinder body 19 and divides the inner cylinder body 19 into a third oil chamber 7 and a first air chamber 4. The first air chamber 4 performs gas exchange through the inflation valve 2 provided at the center position of the upper earring 1; the built-in accumulator 2 includes an outer floating piston 14, which is located in an annular cavity formed by the outer wall of the inner cylinder body 19, the inner wall of the outer cylinder body 3, the end face of one side of the integrated piston rod 9 and the end face of the upper earring 1, and divides it into a first oil chamber 15 and a second air chamber 13. The second air chamber 13 performs gas exchange through the inflation valve 2 provided at one side of the upper earring 1.

[0023] For option one, both the inner floating piston 16 and the outer floating piston 14 have cavities, wherein the outer cylinder body 3 and the integrated piston rod 9 form a second oil chamber 6, the outer floating piston 14, the inner cylinder body 19, the outer cylinder body 3, and the integrated piston rod 9 form a first oil chamber 15, the sealing end cover 18 and the integrated piston rod 9 form a fourth oil chamber 8, and the outer end surface of the inner floating piston 16 and the sealing end cover 18 form a third oil chamber 7; the inner floating piston 16, the inner cylinder body 19 and the upper earring 1 form a first air chamber 4, and the outer floating piston 14, the upper earring 1, the inner cylinder body 19 and the outer cylinder body 3 form a second air chamber 13.

[0024] Before the oil-gas spring works, oil is injected into the first oil chamber 15 , the second oil chamber 6 , the third oil chamber 7 , and the fourth oil chamber 8 , and nitrogen is injected into the first air chamber 4 and the second air chamber 13 through the charging valve 2 .

[0025] For option 2: The device comprises an upper earring 1, an inflation valve 2, an outer cylinder 3, a screw plug 5, an integrated piston rod 9, a sealing end cap 18, an inner cylinder 19, a first airbag 10, and a second airbag 17. Compared to Scheme 1, Scheme 2 uses the first airbag 10, the second airbag 17, and internal nitrogen to provide elastic force, replacing the nitrogen in the outer floating piston 14 and the second air chamber 13, and the nitrogen in the inner floating piston 16 and the first air chamber 4, respectively. In Scheme 2, the first airbag 10 is mounted on the inflation channel on one side of the upper earring 1, located within the annular cavity formed by the upper earring 1, the outer cylinder 3, the inner cylinder 19, and the integrated piston rod 9. The second airbag 17 is mounted on the inflation channel in the middle of the upper earring 1, located within the cavity formed by the upper earring 1, the inner cylinder 19, and the sealing end cap 18 (the connection method is the same as in Scheme 1 and is not repeated here).

[0026] The built-in accumulator 1 includes a second airbag 17, the outer wall of the second airbag 17, the inner wall of the inner cylinder body 19 and the inner end surface of the sealing end cover 18 form a sixth oil chamber 12, and the second airbag 17 performs gas exchange through the inflation valve 2 provided at the center position of the upper earring 1; the built-in accumulator 2 includes a first airbag 10, the outer wall of the first airbag 10, the outer wall of the inner cylinder body 19, the inner wall of the outer cylinder body 3, the end surface of one side of the integrated piston rod 9 and the end surface of the upper earring 1 form a fifth oil chamber 11, and the first airbag 10 performs gas exchange through the inflation valve 2 provided at one side of the upper earring 1.

[0027] For the second solution, before the oil-gas spring works, oil is filled into the second oil chamber 6 , the fourth oil chamber 8 , the fifth oil chamber 11 , and the sixth oil chamber 12 , and nitrogen is filled into the first airbag 10 and the second airbag 17 through the inflation valve 2 .

[0028] In both schemes, the sealing end cover 18 is provided with a third damping hole 23, a fourth damping hole 25 and a second one-way valve 24; the piston structure in the integrated piston rod 9 is provided with a second damping hole 22, a first one-way valve 21 and a first damping hole 20; the fourth damping hole 25 is connected in series with the second one-way valve 24, and the first damping hole 20 is connected in series with the first one-way valve 21. Inflation channels are opened in the center and one side of the upper earring 1, and oil circuits are opened in the outer cylinder body 3 and the integrated piston rod 9.

[0029] During operation, the integrated piston rod 9 is subjected to external load force and is thus stretched and compressed.

[0030] When the integrated piston rod 9 is compressed, the volume of the first oil chamber 15 and the fourth oil chamber 8 decreases in the first embodiment. The oil flows through the second damping orifice 22, the first damping orifice 20, and the first one-way valve 21 of the piston structure of the integrated piston rod 9, and the third damping orifice 23, the fourth damping orifice 25, and the second one-way valve 24 of the sealing end cap 18, respectively, before flowing into the second oil chamber 6 and the third oil chamber 7. Since the reduction in oil in the first oil chamber 15 and the fourth oil chamber 8 is equal to the increase in oil in the second oil chamber 6 and the third oil chamber 7, respectively, the outer floating piston 14 and the inner floating piston 16 compress the nitrogen in the second air chamber 13 and the first air chamber 4, respectively, thereby generating an elastic cushioning effect. Since the oil can pass through the one-way valve during compression, the oil flowing through the damping orifice generates a smaller damping force, resulting in a better cushioning effect.

[0031] (For Scheme 2, except for some changes in the form of the oil cavity and air cavity, the principle and effect are the same as those of Scheme 1 and will not be repeated here).

[0032] When the integrated piston rod 9 is stretched, the volumes of the first and fourth oil chambers 15 and 8 increase in Scheme 1. Oil is replenished from the second and third oil chambers 6 and 7, respectively. The oil then flows through the second damping orifice 22 of the piston structure of the integrated piston rod 9 and the third damping orifice 23 of the sealing end cap 18, respectively, before flowing into the first and fourth oil chambers 15 and 8, respectively. The increase in oil in the first and fourth oil chambers 15 and 8 is equal to the decrease in oil in the second and third oil chambers 6 and 7, respectively. This causes the nitrogen in the outer and inner floating pistons 14 and 16 to expand. Because the one-way valves in the integrated piston rod 9 and the sealing end cap 18 remain closed during the stretching process, the oil flowing through the damping orifices generates a significant damping force.

[0033] (For Scheme 2, except for some changes in the form of the oil cavity and air cavity, the principle and effect are the same as those of Scheme 1 and will not be repeated here).

[0034] In scheme one, the upper earring 1, the second air chamber 13, the outer floating piston 14, the first oil chamber 15, the second oil chamber 6, the outer cylinder body 3, the integrated piston rod 9, the inner cylinder body 19, the internal gas and liquid and the corresponding inflation valve 2 constitute a first set of devices; the upper earring 1, the integrated piston rod 9, the sealing end cover 18, the inner cylinder body 19, the third oil chamber 7, the fourth oil chamber 8, the first air chamber 4, the internal gas and liquid and the corresponding inflation valve 2 constitute a second set of devices; the oil between the two sets of devices is sealed by the sealing end cover 18. Only when the seal of the first set of devices fails, the oil will leak between the first oil chamber 15 and the second oil chamber 6, causing the first set of devices to work abnormally, but because the seal between the two sets of devices is normal, the oil cannot leak into the fourth oil chamber 8, and the oil is still sealed without leakage, so the second set of devices can operate independently and function; only when the sealing effect of the second set of devices fails, the oil flows from the fourth oil chamber 8 into the first oil chamber 15 through the sealing end cover 18. At this time, the oil volume in the first oil chamber 15 increases, but because the seal of the first set of devices is normal and can still work, the oil-gas spring will fail only when the seals of both sets of devices are abnormal, and the safety and reliability of the oil-gas spring are enhanced by redundant devices.

[0035] (For Scheme 2, except for some changes in the form of the oil chamber and air chamber, the way and effect of constructing the safety redundancy device are the same as those of Scheme 1, and will not be elaborated here).

[0036] Both schemes use a built-in air cavity structure in the device, eliminating the pipes and connectors used in the external accumulator, making the device more compact and with a higher safety factor.

[0037] The above disclosure is only a preferred embodiment of the present application, and certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A heavy vehicle safety redundant oil and gas spring device, characterized in that: It includes an upper earring, an inflation valve, an outer cylinder, a screw plug, an integrated piston rod, a sealing end cover, and an inner cylinder; the inner cylinder and the outer cylinder are respectively fixedly connected to the upper earring; the integrated piston rod is located between the outer cylinder and the inner cylinder; the sealing end cover is located between the inner cylinder and the integrated piston rod, and one end face thereof is fixedly connected to the inner cylinder; the sealing end cover and the integrated piston rod form a fourth oil chamber, and the integrated piston rod and the outer cylinder are both provided with oil passages; air passages are opened at the center and one side of the upper earring; the fourth oil chamber exchanges oil with the outside through the oil passage on the integrated piston rod; A built-in accumulator 1 is provided inside the inner cylinder body, and a built-in accumulator 2 is provided in an annular cavity surrounded by the outer wall of the inner cylinder body, the inner wall of the outer cylinder body, the end face of one side of the integrated piston rod and the end face of the upper earring; the built-in accumulator 1 exchanges gas with the outside through the inflation valve at the center position of the upper earring; the built-in accumulator 2 exchanges gas with the outside through the inflation valve at one side position of the upper earring.

2. The heavy vehicle safety redundant oil and gas spring device according to claim 1, characterized in that: The built-in accumulator 1 includes an inner floating piston, which is located in the inner cylinder and divides the inner cylinder into a third oil chamber and a first air chamber. The first air chamber exchanges gas through an inflation valve at the center of the upper earring; The second built-in accumulator includes an external floating piston, which is located in an annular cavity surrounded by the outer wall of the inner cylinder body, the inner wall of the outer cylinder body, the end face of one side of the integrated piston rod and the end face of the upper earring, and is divided into a first oil chamber and a second air chamber. The second air chamber exchanges gas through an inflation valve located on one side of the upper earring.

3. The heavy vehicle safety redundant oil and gas spring device according to claim 1, characterized in that: The built-in accumulator 1 includes a second airbag, which is located in the inner cylinder body. The outer wall of the second airbag, the inner wall of the inner cylinder body and the inner end face of the sealing end cover form a sixth oil chamber, and the second airbag exchanges gas through the inflation valve at the center position of the upper earring; the built-in accumulator 2 includes a first airbag, which is located in an annular cavity formed by the outer wall of the inner cylinder body, the inner wall of the outer cylinder body, the end face of one side of the integrated piston rod, and the end face of the upper earring. The outer wall of the first airbag, the outer wall of the inner cylinder body, the inner wall of the outer cylinder body, the end face of one side of the integrated piston rod and the end face of the upper earring form a fifth oil chamber, and the first airbag exchanges gas through the inflation valve at one side of the upper earring.

4. The heavy vehicle safety redundant oil-gas spring device according to any one of claims 2 or 3, characterized in that: The integrated piston rod includes an earring structure, a rod structure, and a piston structure; the earring structure is connected to the vehicle wheel, the rod structure connects the earring structure and the piston structure and is arranged between the outer cylinder body and the inner cylinder body, and the piston structure is arranged between the outer cylinder body and the inner cylinder body.

5. The heavy vehicle safety redundant oil and gas spring device according to claim 4, characterized in that: The sealing end cover is provided with a third damping hole, a fourth damping hole and a second one-way valve; the piston structure in the integrated piston rod is provided with a second damping hole, a first one-way valve and a first damping hole; the fourth damping hole is connected in series with the second one-way valve, and the first damping hole is connected in series with the first one-way valve.

6. The heavy vehicle safety redundant oil and gas spring device according to claim 2, characterized in that: Before the heavy-duty vehicle safety redundant oil-gas spring device works, oil is injected into the first oil chamber, the second oil chamber, the third oil chamber, and the fourth oil chamber through the oil circuit, and nitrogen is injected into the first air chamber and the second air chamber through the inflation valve.

7. The heavy vehicle safety redundant oil and gas spring device according to claim 3, characterized in that: Before the oil-gas spring works, oil is filled into the second oil chamber, the fourth oil chamber, the fifth oil chamber and the sixth oil chamber through the oil circuit, and nitrogen is filled into the first airbag and the second airbag through the charging valve.

8. The heavy vehicle safety redundant oil and gas spring device according to claim 5, characterized in that: When the integrated piston rod is compressed, the volume of the first oil chamber and the fourth oil chamber decreases, and the oil passes through the second damping hole, the first damping hole and the first one-way valve of the integrated piston rod piston structure, the third damping hole, the fourth damping hole and the second one-way valve of the sealing end cover, and then flows into the second oil chamber and the third oil chamber respectively. Since the reduction in the first oil chamber and the fourth oil chamber is equal to the increase in the second oil chamber and the third oil chamber respectively, the outer floating piston and the inner floating piston compress the nitrogen in the second air chamber and the first air chamber respectively, thereby generating an elastic buffering effect. Since the oil can pass through the first one-way valve and the first damping hole, the second one-way valve and the fourth damping hole during the compression process, the oil flowing through the damping hole generates a smaller damping force and has a good buffering effect.

9. The heavy vehicle safety redundant oil and gas spring device according to claim 5, characterized in that: When the integrated piston rod is stretched, the volume of the first oil chamber and the fourth oil chamber increases, and the oil is replenished by the oil in the second oil chamber and the third oil chamber. At this time, the oil passes through the second damping hole of the integrated piston rod and piston structure and the third damping hole of the sealing end cover, and then flows into the first oil chamber and the fourth oil chamber respectively; the increase in the first oil chamber and the fourth oil chamber is equal to the decrease in the second oil chamber and the third oil chamber respectively. At this time, the nitrogen in the outer floating piston and the inner floating piston expands. Since the integrated piston rod and piston structure and the one-way valve of the sealing end cover are in a closed state during the stretching process, the oil flows through the damping hole to generate a larger damping force.

10. The heavy vehicle safety redundant oil and gas spring device according to claim 5, characterized in that: The upper earring, the second air chamber, the outer floating piston, the first oil chamber, the second oil chamber, the outer cylinder body, the integrated piston rod, the inner cylinder body, the internal gas-liquid and the corresponding inflation valve constitute the first set of devices; the upper earring, the integrated piston rod, the sealing end cover, the inner cylinder body, the third oil chamber, the fourth oil chamber, the first air chamber, the internal gas-liquid and the corresponding inflation valve constitute the second set of devices; the oil between the two sets of devices is sealed by the sealing end cover; only when the seal of the first set of devices fails, the oil will leak between the first oil chamber and the second oil chamber, causing the first set of devices to work abnormally, but because the seal between the two sets of devices is normal, the oil cannot leak into the fourth oil chamber, and the oil is still sealed without leakage, so the second set of devices can operate independently and function; only when the sealing effect of the second set of devices fails, the oil flows from the fourth oil chamber into the first oil chamber through the sealing end cover. At this time, the oil volume in the first oil chamber increases, but because the seal of the first set of devices is normal, it can still function. Therefore, the oil-gas spring will fail only when the seals of both sets of devices are abnormal.

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