Side-hanging type vehicle-mounted CNG cylinder fixing structure

Abstract

The invention relates to the technical field of vehicle-mounted power installation, and particularly discloses a side hanging type vehicle-mounted CNG cylinder fixing structure. When the side face of a vehicle is impacted and the impact force exceeds a preset value, the locking mechanism can automatically trigger the unlocking action, connection between the clamping hoop structure and the multi-binding mechanism which are originally rigidly fixed is converted into movable connection, and therefore a limited and controllable displacement freedom degree is provided for the gas cylinder body at the moment of collision. Therefore, under the extreme collision working condition, secondary shearing or extrusion damage to the gas cylinder body caused by self deformation of the locking mechanism is effectively avoided, the risk that the wall of the gas cylinder is broken due to stress concentration is remarkably reduced, and the passive safety of the high-pressure gas cylinder in the lateral collision process is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle power installation technology, and in particular to a side-mounted vehicle CNG cylinder fixing structure. Background Technology

[0002] Compressed natural gas (CNG) cylinders are critical safety components used to store high-pressure natural gas as vehicle fuel. They are primarily used in natural gas-powered vehicles, including some new energy buses, taxis, and dual-fuel models converted from traditional gasoline vehicles. Their function is to safely and reliably store sufficient gas within the limited space of the vehicle, providing clean energy for the engine. Because the cylinder itself is a high-pressure container and is typically located in areas prone to collisions, such as the sides or bottom of the vehicle, the reliability of its mounting structure directly affects the overall operational safety and protective performance of the vehicle.

[0003] CNG cylinders are typically mounted on the vehicle body using rigid metal brackets and clamps. Specifically, the cylinder is placed within a fixed frame constructed from welded or bolted steel sections and secured with metal clamps, high-strength bolts, and other locking mechanisms. This mounting method aims to prevent displacement of the cylinder during the vibrations and bumps of daily vehicle operation. Its core design prioritizes static structural stability and connection rigidity, treating the cylinder and vehicle frame as a rigidly connected whole.

[0004] However, when a vehicle is involved in a severe accident such as a side collision, the enormous impact energy is transferred through the vehicle frame to the fixed structure. Because the fixed brackets, clamps, and gas cylinders are rigidly connected, the impact force acts directly and without buffering on the gas cylinder body. This not only subjectes the gas cylinder to direct collision loads but also causes the rigid fixed structure itself to exert secondary compression, shearing, or puncture on the gas cylinder during deformation, drastically worsening the stress state of the gas cylinder. This greatly increases the risk of localized stress concentration and material rupture within the cylinder. If the gas cylinder leaks or fails under such damage, the instantaneous release of high-pressure gas can easily trigger a more serious combustion and explosion accident, leading to catastrophic consequences.

[0005] Therefore, the urgent need to design a fixing structure that can effectively mitigate the impact of a collision and avoid secondary damage to the gas cylinder has become a key technical problem that needs to be solved in this field. Summary of the Invention

[0006] To address the issue that rigid fixing structures cause secondary compression and shearing damage to gas cylinders due to their own deformation during vehicle collisions, thereby greatly increasing the risk of gas cylinder rupture and gas leakage, this application provides a side-mounted vehicle-mounted CNG gas cylinder fixing structure.

[0007] This application provides a side-mounted vehicle-mounted CNG cylinder fixing structure, which adopts the following technical solution: A side-mounted vehicle-mounted CNG cylinder fixing structure is used to fix the cylinder body located on the side of the vehicle frame. It includes multiple clamping structures for clamping the cylinder body, a fixing base fixed to the vehicle frame, and multiple locking mechanisms for fixing each clamping structure to the fixing base. Each locking mechanism unlocks the corresponding clamp structure after being impacted and exceeding a predetermined value, thereby enabling a movable connection between the corresponding clamp structure and the locking mechanism.

[0008] Optionally, the clamp structure includes an upper clamp seat, a lower clamp seat, and a locking connector. The upper clamp seat and the lower clamp seat are fitted together outside the gas cylinder body, and the locking connector is disposed between the upper clamp seat and the lower clamp seat and is used to lock and fix the ends of the two.

[0009] Optionally, the locking mechanism includes a support rod, an outer protective frame, a first buffer assembly, a pull connection assembly, a shear pin, and a movable connection assembly. Two support rods are provided and are located on opposite sides of the upper clamp seat and the lower clamp seat. The two support rods are slidably mounted on the fixed base along the height direction of the vehicle frame. The outer protective frame is semi-enclosed and is provided outside the two support rods with an opening on the side close to the fixed base. Two sets of the first buffer components are provided at both ends of the outer protective frame. The two first buffer components are installed at intervals on the fixed base and can be used to provide elastic damping for the outer protective frame away from the side wall of the fixed base. Two sets of the tension connection components are provided corresponding to the two support rods and are respectively located between the outer protective frame and the corresponding support rod. Two sets of shear pins are provided. The two shear pins are used to fix the outer protective frame and the two support rods to the tension connection components. The movable connection components are provided in two sets. The two movable connection components are used to allow the upper clamp seat and the lower clamp seat to be movably connected to the corresponding support rod after the two shear pins break.

[0010] Optionally, the first buffer assembly includes a buffer seat fixed to the side wall of the fixed base, a first buffer spring disposed in the buffer seat, and a buffer plate fixed to the end of the outer protective frame. The buffer plate is slidably and anti-dislodgement limitedly installed in the buffer seat and elastically abuts against the first buffer spring. The buffer plate has frictional damping with the inner wall of the buffer seat.

[0011] Optionally, the tension connection assembly includes a first rotating shaft rotatably mounted on the outer protective frame, a second rotating shaft rotatably mounted on the support rod, and a connecting rod that fixes the first rotating shaft and the second rotating shaft together. Both the first rotating shaft and the outer protective frame are provided with a socket for the shear pin to be inserted.

[0012] Optionally, the movable connection assembly includes a limiting seat, a limiting rod, and an anti-detachment spring. The limiting seat is fixed to the upper clamp seat and the lower clamp seat, and the limiting rod is fixed to the end of the limiting seat away from the upper clamp seat or the lower clamp seat. The diameter of the limiting rod is smaller than the diameter of the limiting seat. The support rod has a first limiting groove and a second limiting groove that are interconnected with each other, corresponding to the limiting seat and the limiting rod. The diameter of the first limiting groove is adapted to the limiting seat, and the diameter of the second limiting groove is adapted to the limiting rod. One end of the anti-detachment spring is fixedly connected to the bottom wall of the first limiting groove, and the other end is fixedly connected to the end of the limiting seat.

[0013] Optionally, the outer protective frame is provided with two guide seats corresponding to the ends of the two support rods, and each of the two guide seats is provided with a guide groove for the ends of the support rods to slide along the height direction of the frame. The outer protective frame is provided with two sliding seats corresponding to the two guide seats, and the two guide seats are slidably installed on the corresponding sliding seats in a direction perpendicular to the side wall of the fixed base.

[0014] Optionally, a second buffer assembly is provided near the end of the support rod away from the fixed base. The second buffer assembly includes a guide block slidably connected to the guide seat, a buffer rod fixedly connected to the guide block, a buffer platform fixedly connected to the end of the buffer rod away from the guide block, and a second buffer spring for buffering the buffer platform. The second buffer spring is installed in an inner cavity opened at the end of the support rod and can provide damping buffer for the buffer platform.

[0015] Optionally, a buffer section for cushioning is provided between the two guide seats, and the impact-bearing parts of the buffer section and the outer protective frame are both designed with the same arch shape.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. The structure in this application provides a stable and rigid fixation through the locking mechanism under normal conditions, ensuring the absolute position stability of the gas cylinder during vehicle movement. When the vehicle side encounters a violent impact exceeding a predetermined threshold, the locking mechanism can automatically unlock instantly, allowing the clamp structure fixing the gas cylinder and connected components to enter a buffered sliding state with two-stage composite damping along the height of the vehicle frame. This transforms the collision energy from direct hard compression of the gas cylinder body into controllable kinetic energy and damping dissipation of the gas cylinder system, thereby effectively isolating the gas cylinder from secondary shearing or puncture damage caused by the deformation of the fixing structure itself, and significantly improving the survivability of the high-pressure gas cylinder in side collision accidents.

[0017] 2. The arched structure of the outer frame and buffer section can disperse the impact energy multiple times, and with the help of secondary damping, buffer and dissipate the impact energy. Finally, the remaining impact energy is applied to the support rod, which is then connected to the gas cylinder body to further reduce the transmission of impact energy. The various components work together to greatly improve the impact resistance of the gas cylinder body. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the side-mounted vehicle-mounted CNG cylinder fixing structure during installation in the embodiments of this application.

[0020] Figure 2 yes Figure 1 A schematic diagram of the centrally mounted CNG cylinder fixing structure and the overall structure of the CNG cylinder.

[0021] Figure 3 yes Figure 2 A schematic diagram of the overall structure of the side-mounted CNG cylinder fixing structure.

[0022] Figure 4 yes Figure 3 A partial structural diagram of the side-mounted CNG cylinder fixing structure.

[0023] Figure 5 yes Figure 4 Partial sectional view and enlarged structural diagram of the side-mounted CNG cylinder fixing structure.

[0024] Figure label: 1. Frame; 11. Gas cylinder body; 12. Mounting base; 2. Clamp structure; 21. Upper clamp seat; 22. Lower clamp seat; 23. Locking connector; 3. Locking mechanism; 31. Support rod; 32. Outer protective frame; 33. First buffer assembly; 331. Buffer seat; 332. First buffer spring; 333. Buffer plate; 34. Pull connection assembly; 341. First rotating shaft; 342. Second rotating shaft; 343. Connecting rod; 35. Shear pin; 36. Movable connection assembly; 361. Limit seat; 362. Limit rod; 363. Anti-detachment spring; 4. Guide seat; 41. Guide groove; 5. Sliding seat; 6. Second buffer assembly; 61. Guide block; 62. Buffer rod; 63. Buffer platform; 64. Second buffer spring. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail below.

[0026] This application discloses a side-mounted vehicle-mounted CNG cylinder fixing structure.

[0027] Reference Figure 1 and Figure 2 A side-mounted vehicle-mounted CNG cylinder fixing structure is used to fix the cylinder body 11 installed on the side of the frame 1 of a new energy vehicle. A cylinder body 11 is fixed on both sides of the frame 1. The side of the frame 1 is provided with multiple clamping structures 2 for clamping the cylinder body 11, a fixing base 12 fixed to the frame 1, and multiple locking mechanisms 3 for fixing each clamping structure 2 to the fixing base 12.

[0028] Each locking mechanism 3 unlocks the corresponding clamp structure 2 after being impacted and exceeding a predetermined value, so that the corresponding clamp structure 2 and the locking mechanism 3 are movably connected.

[0029] When a new energy vehicle is impacted from the side and the impact force exceeds a predetermined value, the locking mechanism 3 in this application can automatically trigger the unlocking action, transforming the connection between the originally rigid clamp structure 2 and the multi-clamp mechanism into a movable connection. This provides a limited and controllable degree of displacement freedom for the gas cylinder body 11 at the moment of impact. Therefore, under extreme collision conditions, it effectively avoids secondary shearing or crushing damage to the gas cylinder body 11 caused by the deformation of the locking mechanism 3 itself, significantly reducing the risk of gas cylinder wall rupture due to stress concentration, and improving the passive safety of the high-pressure gas cylinder in side collisions. This greatly enhances the safety factor of new energy vehicles in collisions such as car accidents, and greatly protects the safety of passengers.

[0030] Specifically, refer to Figure 2 , Figure 3 and Figure 4 The clamp structure 2 includes an upper clamp seat 21, a lower clamp seat 22, and a locking connector 23. The upper clamp seat 21 and the lower clamp seat 22 are fitted together on the outside of the gas cylinder body 11. The locking connector 23 is disposed between the upper clamp seat 21 and the lower clamp seat 22 and is used to lock and fix their ends. In this embodiment, the upper clamp seat 21 and the lower clamp seat 22 are made of forged aluminum alloy. In other embodiments, they can also be made of high-strength ductile iron.

[0031] When the gas cylinder body 11 needs to be installed, the upper clamp seat 21 and the lower clamp seat 22 can be easily separated or closed by operating the locking connector 23. In this embodiment, the locking connector 23 is fixed by bolt connection. In other embodiments, the locking connector 23 can also adopt other adjustable locking connection methods.

[0032] Reference Figure 3 , Figure 4 and Figure 5 The locking mechanism 3 includes a support rod 31, an outer protective frame 32, a first buffer assembly 33, a pull connection assembly 34, a shear pin 35, and a movable connection assembly 36. There are two support rods 31, which are located on opposite sides of the upper clamp seat 21 and the lower clamp seat 22. The two support rods 31 are slidably mounted on the fixed base 12 along the height direction of the frame 1. The outer protective frame 32 is semi-enclosed and is located outside the two support rods 31 with an opening on the side close to the fixed base 12.

[0033] In this embodiment, the fixed base 12, the outer protective frame 32, and the support rod 31 are made of strong steel such as high-strength low-alloy structural steel. In other embodiments, steel used for automobile beams may also be used.

[0034] Two sets of first buffer components 33 are provided at both ends of the outer protective frame 32. The two first buffer components 33 are installed at intervals on the fixed base 12 and can be used to provide elastic damping for the outer protective frame 32 away from the side wall of the fixed base 12. Two sets of tension connection components 34 are provided corresponding to the two support rods 31 and are respectively located between the outer protective frame 32 and the corresponding support rods 31. Two sets of shear pins 35 are provided. The two shear pins 35 are used to fix the outer protective frame 32 and the two support rods 31 to the tension connection components 34.

[0035] Two sets of movable connection components 36 are provided. The two movable connection components 36 are used to make the upper clamp seat 21 and the lower clamp seat 22 movably connected to the corresponding support rod 31 after the two shear pins 35 break.

[0036] Reference Figure 4 and Figure 5 The first buffer assembly 33 includes a buffer seat 331 fixed to the side wall of the fixed base 12, a first buffer spring 332 disposed in the buffer seat 331, and a buffer plate 333 fixed to the end of the outer protective frame 32. The buffer plate 333 is slidably and anti-detachment limitedly installed in the buffer seat 331 and elastically abuts against the first buffer spring 332. There is frictional damping between the buffer plate 333 and the inner wall of the buffer seat 331.

[0037] When a new energy vehicle is subjected to a side impact, the outer protective frame 32 is compressed, and the outer protective frame 32 compresses the shear pin 35. When the compressive force exceeds the stiffness limit of the shear pin 35, the shear pin 35 breaks. At this time, the outer protective frame 32 drives the buffer plate 333 to slide in the buffer seat 331. The frictional damping between the buffer plate 333 and the inner wall of the buffer seat 331 will generate continuous frictional resistance. At the same time, the first buffer spring 332 is compressed and provides a gradually increasing elastic reaction force. The combined action of frictional damping and spring force provides a nonlinear composite damping effect for the movement of the outer protective frame 32, thereby significantly buffering and dissipating the impact.

[0038] Reference Figure 4 and Figure 5 The tension connection assembly 34 includes a first rotating shaft 341 rotatably mounted on the outer protective frame 32, a second rotating shaft 342 rotatably mounted on the support rod 31, and a connecting rod 343 that fixes the first rotating shaft 341 and the second rotating shaft 342 together. Both the first rotating shaft 341 and the outer protective frame 32 are provided with a socket for inserting the shear pin 35.

[0039] When the vehicle is not in a collision, the shear pin 35 inserted into the socket of the first rotating shaft 341 and the outer protective frame 32 can keep the first rotating shaft 341 and the outer protective frame 32 rigidly fixed. The support rod 31 and the outer protective frame 32 are rigidly tightened and fixed by the connecting rod 343 and the second rotating shaft 342, ensuring that the position of the support rod 31, the clamp structure 2 and the gas cylinder body 11 is absolutely stable in normal conditions.

[0040] Reference Figure 4 and Figure 5 The movable connection component 36 includes a limiting seat 361, a limiting rod 362, and an anti-detachment spring 363. The limiting seat 361 is fixed on the upper clamp seat 21 and the lower clamp seat 22. The limiting rod 362 is fixed on the end of the limiting seat 361 that is away from the upper clamp seat 21 or the lower clamp seat 22, and the diameter of the limiting rod 362 is smaller than the diameter of the limiting seat 361.

[0041] The support rod 31 has a first limiting groove and a second limiting groove that are interconnected with each other, corresponding to the limiting seat 361 and the limiting rod 362. The diameter of the first limiting groove is adapted to the limiting seat 361, and the diameter of the second limiting groove is adapted to the limiting rod 362. One end of the anti-detachment spring 363 is fixedly connected to the bottom wall of the first limiting groove, and the other end is fixedly connected to the end of the limiting seat 361.

[0042] Reference Figure 4 and Figure 5Two guide seats 4 are respectively provided on the outer frame 32 corresponding to the ends of the two support rods 31. Each guide seat 4 has a guide groove 41 for the ends of the support rods 31 to slide along the height direction of the frame 1. Two sliding seats 5 are respectively provided on the outer frame 32 corresponding to the two guide seats 4. The two guide seats 4 are slidably installed on the corresponding sliding seats 5 in a direction perpendicular to the side wall of the fixed base 12.

[0043] When the shear pin 35 breaks, the impact will cause the outer protective frame 32 to move towards the fixed base 12. At this time, the connecting rod 343 will drive the two support rods 31 to move away from each other. At this time, the upper limit seat 361 moves out of the first limit groove, and the upper limit rod 362 moves from the second limit groove to the first limit groove. Since the cross-sectional area of ​​the first limit groove is larger than that of the second limit groove, the limit rod 362 is no longer limited. During the collision, it is no longer rigidly connected with the support rod 31, which greatly reduces the possibility of the impact force being transmitted to the gas cylinder body 11.

[0044] At the same time, the anti-detachment spring 363 will pull the limiting seat 361 and the limiting rod 362, making it difficult for the limiting rod 362 to detach from the first limiting groove. This ensures that the upper part of the gas cylinder body 11 still has the ability to limit its range of movement. Thus, although the gas cylinder body 11 can move within a certain range, it ensures that the movement of the gas cylinder body 11 will not exceed a certain range, preventing the gas cylinder body 11 from falling directly off the frame 1 after a collision.

[0045] The lower limiting seat 361 and limiting rod 362 remain connected to the first limiting groove and the second limiting groove under the influence of gravity. However, the upper part of the gas cylinder body 11 is already in a movable state. If the lower support rod 31 deforms, the deformation force will cause the gas cylinder body 11 to move upward. Compared with the fixed gas cylinder body 11, this movable state can greatly reduce the possibility of the gas cylinder body 11 being squeezed and bursting, thereby protecting the safety of the occupants of the new energy vehicle as much as possible.

[0046] Furthermore, refer to Figure 4 and Figure 5 A second buffer assembly 6 is provided at the end of the support rod 31 near the fixed base 12. The second buffer assembly 6 includes a guide block 61 slidably connected to the guide seat 4, a buffer rod 62 fixedly connected to the guide block 61, a buffer platform 63 fixedly connected to the end of the buffer rod 62 away from the guide block 61, and a second buffer spring 64 that buffers the buffer platform 63. The second buffer spring 64 is installed in the inner cavity opened at the end of the support rod 31 and can provide damping buffer for the buffer platform 63. A buffer part for buffering is provided between the two guide seats 4. The buffer part and the impact-bearing part of the outer protective frame 32 are both arranged in the same arch shape.

[0047] When a lateral impact force is applied to the arched impact area of ​​the outer protective frame 32, the arched structure can use its curved surface to disperse the concentrated impact force to both sides and transmit it to the guide seats 4 at both ends and the first buffer assembly 33, thereby avoiding stress concentration and improving the deformation resistance of the outer protective frame 32 itself.

[0048] When a collision occurs, the outer protective frame 32 will first drive the two support rods 31 to move away from each other, thereby unlocking the two support rods 31 from the gas cylinder body 11. Then the impact force will act on the buffer part. The arched structure of the buffer part can further disperse the impact force and drive the two guide seats 4 to move closer to the end of the support rod 31. This will drive the guide block 61, buffer rod 62 and buffer platform 63 to compress the second buffer spring 64. The frictional damping between the buffer platform 63 and the inner cavity of the end of the support rod 31 will further buffer the impact.

[0049] After multiple buffering cycles, the force finally acts on the support rod 31. At this point, the impact force on the support rod 31 is greatly reduced, and the impact force transmitted to the gas cylinder body 11, which is movably connected to the support rod 31, is greatly weakened. This greatly reduces the possibility of the gas cylinder body 11 being deformed under pressure, significantly improving the safety of the gas cylinder body 11 after a car accident and ensuring the safety of passengers in new energy vehicles.

[0050] The implementation principle of a side-mounted vehicle-mounted CNG cylinder fixing structure in this application is as follows: When the vehicle is in normal driving condition, the gas cylinder body 11 is held and fixed by the upper clamp seat 21 and the lower clamp seat 22, and locked by the locking connector 23. At this time, the support rod 31 is rigidly tightened to the outer protective frame 32 by the tension connection assembly 34 locked by the shear pin 35, while the outer protective frame 32 is elastically connected to the fixed base 12 by the first buffer assembly 33 at both ends, but without large displacement. The entire system is in a stable and rigid fixed state.

[0051] When a severe side impact occurs, the impact force first acts on the arched impact area of ​​the outer protective frame 32. After being dispersed, the force is transmitted to the shear pin 35 through the tension connection assembly 34. When the impact force exceeds a predetermined threshold, the shear pin 35 is sheared, the tension connection assembly 34 fails, and the rigid constraint between the support rod 31 and the outer protective frame 32 is released.

[0052] Under inertia, the clamp structure 2 and support rod 31, which are fixed to the gas cylinder, gain the freedom to slide along the height direction of the frame 1, compressing the anti-detachment spring 363 in the movable connection assembly 36 and beginning to slide. At the same time, the outer protective frame 32 moves laterally under impact, compressing the first buffer assembly 33. The sliding of the support rod 31 drives the second buffer assembly 6 at its end to work, cooperating with the first buffer assembly 33 to gradually convert the kinetic energy of the gas cylinder system into frictional heat and the potential energy of the spring and dissipate it.

[0053] Throughout the process, the gas cylinder body 11 achieves controllable displacement within a limited space, avoiding hard compression with the deformed vehicle body or fixed structure, until the impact energy is completely absorbed. Under the action of the buffer component and the anti-detachment spring 363, the system tends to stabilize, thus completing the passive safety protection of the gas cylinder.

[0054] The above are all optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A side-mounted vehicle-mounted CNG cylinder fixing structure for fixing the cylinder body (11) located on the side of the vehicle frame (1), characterized in that: It includes multiple clamp structures (2) for clamping the gas cylinder body (11), a fixing base (12) for fixing to the vehicle frame (1), and multiple sets of locking mechanisms (3) for fixing each clamp structure (2) to the fixing base (12). Each locking mechanism (3) unlocks the corresponding clamp structure (2) after being impacted and exceeding a predetermined value, so that the corresponding clamp structure (2) and the locking mechanism (3) are movably connected.

2. The side-mounted vehicle-mounted CNG cylinder fixing structure according to claim 1, characterized in that: The clamp structure (2) includes an upper clamp seat (21), a lower clamp seat (22), and a locking connector (23). The upper clamp seat (21) and the lower clamp seat (22) are fitted together outside the gas cylinder body (11). The locking connector (23) is located between the upper clamp seat (21) and the lower clamp seat (22) and is used to lock and fix the ends of the two.

3. The side-mounted vehicle-mounted CNG cylinder fixing structure according to claim 2, characterized in that: The locking mechanism (3) includes a support rod (31), an outer protective frame (32), a first buffer assembly (33), a traction connection assembly (34), a shear pin (35), and a movable connection assembly (36). There are two support rods (31) located on opposite sides of the upper clamp seat (21) and the lower clamp seat (22). The two support rods (31) are slidably mounted on the fixed base (12) along the height direction of the frame (1). The outer protective frame (32) is semi-enclosed and located outside the two support rods (31) with an opening on one side close to the fixed base (12). Two sets of the first buffer components (33) are provided at both ends of the outer protective frame (32). The two first buffer components (33) are installed at intervals on the fixed base (12) and can be used to provide elastic damping of the outer protective frame (32) away from the side wall of the fixed base (12). Two sets of the traction connection components (34) are provided corresponding to the two support rods (31) and are respectively located between the outer protective frame (32) and the corresponding support rods (31). Two sets of shear pins (35) are provided. The two shear pins (35) are used to fix the outer protective frame (32) and the two support rods (31) together by the traction connection components (34). The movable connection assembly (36) is provided in two sets. The two movable connection assemblies (36) are used to make the upper clamp seat (21) and the lower clamp seat (22) movably connected to the corresponding support rod (31) after the two shear pins (35) break.

4. The side-mounted vehicle-mounted CNG cylinder fixing structure according to claim 3, characterized in that: The first buffer assembly (33) includes a buffer seat (331) fixed to the side wall of the fixed base (12), a first buffer spring (332) disposed in the buffer seat (331), and a buffer plate (333) fixed to the end of the outer protective frame (32). The buffer plate (333) is slidably and anti-detachment limitedly installed in the buffer seat (331) and elastically abuts against the first buffer spring (332). The buffer plate (333) has frictional damping with the inner wall of the buffer seat (331).

5. A side-mounted vehicle-mounted CNG cylinder fixing structure according to claim 3, characterized in that: The tension connection assembly (34) includes a first rotating shaft (341) rotatably mounted on the outer protective frame (32), a second rotating shaft (342) rotatably mounted on the support rod (31), and a connecting rod (343) that fixes the first rotating shaft (341) and the second rotating shaft (342) together. Both the first rotating shaft (341) and the outer protective frame (32) are provided with a socket for the shear pin (35) to be inserted.

6. The side-mounted vehicle-mounted CNG cylinder fixing structure according to claim 3, characterized in that: The movable connection assembly (36) includes a limiting seat (361), a limiting rod (362), and an anti-detachment spring (363). The limiting seat (361) is fixed on the upper clamp seat (21) and the lower clamp seat (22). The limiting rod (362) is fixed on one end of the limiting seat (361) away from the upper clamp seat (21) or the lower clamp seat (22), and the diameter of the limiting rod (362) is smaller than the diameter of the limiting seat (361). The support rod (31) has a first limiting groove and a second limiting groove that are interconnected with each other, corresponding to the limiting seat (361) and the limiting rod (362). The diameter of the first limiting groove is adapted to the limiting seat (361), and the diameter of the second limiting groove is adapted to the limiting rod (362). One end of the anti-detachment spring (363) is fixedly connected to the bottom wall of the first limiting groove, and the other end is fixedly connected to the end of the limiting seat (361).

7. The side-mounted vehicle-mounted CNG cylinder fixing structure according to claim 3, characterized in that: Two guide seats (4) are respectively provided on the outer frame (32) corresponding to the ends of the two support rods (31). Each of the two guide seats (4) is provided with a guide groove (41) for the ends of the support rods (31) to slide along the height direction of the frame (1). Two sliding seats (5) are respectively provided on the outer frame (32) corresponding to the two guide seats (4). The two guide seats (4) are slidably installed on the corresponding sliding seats (5) in a direction perpendicular to the side wall of the fixed base (12).

8. The side-mounted vehicle-mounted CNG cylinder fixing structure according to claim 7, characterized in that: The support rod (31) is provided with a second buffer assembly (6) near the end away from the fixed base (12). The second buffer assembly (6) includes a guide block (61) slidably connected to the guide seat (4), a buffer rod (62) fixedly connected to the guide block (61), a buffer platform (63) fixedly connected to the end of the buffer rod (62) away from the guide block (61), and a second buffer spring (64) that buffers the buffer platform (63). The second buffer spring (64) is installed in the inner cavity opened at the end of the support rod (31) and can provide damping buffer for the buffer platform (63).

9. A side-mounted vehicle-mounted CNG cylinder fixing structure according to claim 7, characterized in that: A buffer section for buffering is provided between the two guide seats (4), and the impact-bearing parts of the buffer section and the outer protective frame (32) are both designed with the same arch shape.

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