Nitrogen damper compression state retention tool and method of use

Abstract

The application relates to a nitrogen damper compression state holding tool and a use method, which comprises an auxiliary fixing part and a binding belt. An inner end of the auxiliary fixing part is provided with a fixing structure matched with an outer end part of a damper lower support of the nitrogen damper. The auxiliary fixing part can be fixed with the outer end part of the damper lower support through the fixing structure. An outer end surface of the auxiliary fixing part is provided with a binding belt clamping groove matched with the binding belt. The binding belt is used for being wound around a damper tower top of the nitrogen damper in a compression state and the auxiliary fixing part to make the nitrogen damper keep in the compression state through a closed loop structure formed by the binding belt. The compression state holding tool saves manpower and reduces the labor intensity of assembly personnel.

Description

Technical Field

[0001] This invention relates to the field of nitrogen vibration damper assembly technology, and more specifically to a method for using a nitrogen vibration damper compression state maintenance toolkit. Background Technology

[0002] Users of hardcore off-road vehicles, especially those with extreme driving needs on unpaved roads such as deserts and gravel tracks, often install nitrogen shock absorbers to improve shock absorber stability and maintain overall vehicle handling and safety. Nitrogen shock absorbers utilize an oil-gas separation structure, solving the foaming problem of ordinary hydraulic shock absorbers. They possess greater compression and rebound forces. During assembly, the shock absorber needs to be manually compressed before being installed onto the chassis. After installation, the shock absorber automatically stretches under nitrogen pressure. If subsequent chassis component assembly requires further compression, the shock absorber must be manually compressed again to the designed length until all other components are assembled. This process requires one operator to maintain the compression force on the shock absorber while another operator assembles the components, resulting in high labor costs and strenuous work for the assemblers. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a tool and method for maintaining the compression state of a nitrogen vibration damper, which can maintain the nitrogen vibration damper in a compressed state. When installing components that need to be installed in the compressed state of the vibration damper, there is no need for a dedicated operator to maintain the compression force of the vibration damper, saving labor costs and reducing labor intensity.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, embodiments of the present invention provide a tool for maintaining the compressed state of a nitrogen vibration damper, including an auxiliary fixing member and a strap. The inner end of the auxiliary fixing member is provided with a fixing structure that matches the outer end of the lower support of the nitrogen vibration damper. The auxiliary fixing member can be fixed to the outer end of the lower support of the vibration damper through the fixing structure. The outer end face of the auxiliary fixing member is provided with a strap groove that matches the strap. The strap is used to wrap around the top of the vibration damper tower of the nitrogen vibration damper in the compressed state and the auxiliary fixing member to maintain the nitrogen vibration damper in the compressed state through a closed loop structure formed by the strap.

[0005] Optionally, the fixing structure adopts a slot set at the inner end of the auxiliary fixing member. The slot matches the outer end of the lower support of the shock absorber, and the auxiliary fixing member can be fixed to the outer end of the lower support of the shock absorber through the slot.

[0006] Optionally, the strap is a snap-on strap, including a strap body and a snap-on clamp disposed at one end of the strap body.

[0007] Preferably, the belt is made of nylon material.

[0008] Optionally, the auxiliary fastener is made of polyoxymethylene material.

[0009] Optionally, the bottom groove surface of the strap slot is a flat surface or an arc-shaped surface.

[0010] Optionally, the open side of the auxiliary fastener is provided with a clearance groove to avoid the lower bushing of the nitrogen shock absorber.

[0011] Secondly, embodiments of the present invention provide a method for using the nitrogen damper compression state holding tool described in the first aspect, comprising the following steps: Step S1: Attach the auxiliary fixing piece to the end of the lower support of the nitrogen shock absorber; Step S2: Compress the nitrogen vibration damper to the designed length so that the nitrogen vibration damper is in a compressed state; Step S3: Wrap a strap between the auxiliary fixing component and the top of the nitrogen vibration damper, and use the closed loop structure formed by the strap to keep the nitrogen vibration damper in a compressed state. Step S4: Assemble the compressed nitrogen shock absorber with the frame and lower control arm; Step S5: After the components in the chassis that need to be assembled under the compression state of the nitrogen shock absorber are assembled, remove the straps and auxiliary fasteners.

[0012] Optionally, the components in the chassis that need to be assembled under nitrogen shock absorber compression are the stabilizer bar connecting rod and the brake steering knuckle.

[0013] Optionally, the nitrogen shock absorber can be manually compressed to a compressed state using a crowbar or by using a compression device.

[0014] Optionally, after removing the straps and auxiliary fasteners, place them in the recycling bin for collection.

[0015] The beneficial effects of this invention are as follows: The nitrogen vibration damper compression state holding tool and usage method of the present invention allows the auxiliary fixing component to be fixed to the outer end of the lower support of the nitrogen vibration damper. After the nitrogen vibration damper is compressed, the strap can be wrapped around the top of the vibration damper tower and the auxiliary fixing component to form a closed loop structure. This closed structure keeps the nitrogen vibration damper in a compressed state. The nitrogen vibration damper can be maintained in a compressed state using the strap. When the nitrogen vibration damper is installed in a compressed state, the swing arm bushing is in the designed position, without bushing sway or torsion, ensuring assembly accuracy. At the same time, when assembling components in the mounting chassis that require the nitrogen vibration damper to be in a compressed state, the nitrogen vibration damper can be maintained in a compressed state using the strap, eliminating the need for a dedicated operator to apply compression force to the vibration damper, saving labor costs and reducing the labor intensity of assembly personnel.

[0016] The nitrogen vibration damper compression state maintenance tool and its usage method of the present invention have an auxiliary fixing component with a strap groove, which can limit the strap and ensure that the strap is always wrapped between the top of the vibration damper tower and the auxiliary fixing component, preventing the strap from coming off under the tensile force of the nitrogen vibration damper and ensuring the reliability of the tool. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention after assembly with the nitrogen vibration damper; Figure 2 This is an exploded view of the assembly structure of Embodiment 1 of the present invention and the nitrogen vibration damper; Figure 3 This is a schematic diagram of the nitrogen vibration damper structure in Embodiment 1 of the present invention; Figure 4 This is a flowchart of the usage method in Embodiment 2 of the present invention; Among them, 1. Nitrogen vibration damper, 2. Auxiliary fixing parts, 3. Straps, 4. Vibration damper tower top, 5. Vibration damper piston rod, 6. Vibration damper main cylinder, 7. Vibration damper nitrogen cylinder, 8. Vibration damper lower support, 9. Vibration damper lower bushing. Detailed Implementation

[0019] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0020] For ease of description, the words "upper" and "lower" appearing in this invention only indicate that they are consistent with the upper and lower directions of the accompanying drawings and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0021] Example 1 A nitrogen shock absorber compression holding tool is used to maintain the compression state of the nitrogen shock absorber during automobile chassis assembly to facilitate precise assembly of chassis components. Figures 1-2 As shown, the nitrogen vibration damper compression state maintenance tool includes an auxiliary fixing part 2 and a strap 3, which are used in conjunction with the nitrogen vibration damper 1. The auxiliary fixing part 2 is used to fix one end of the nitrogen vibration damper 1, and the strap 3 is used to wrap around the other end of the auxiliary fixing part 2 and the nitrogen vibration damper 1 to form a closed loop structure. The strap applies a compressive force to the nitrogen vibration damper 1, which cancels out the outward force generated by the nitrogen in the nitrogen vibration damper 1, so as to maintain the compression state of the nitrogen vibration damper 1.

[0022] like Figure 3 As shown, the nitrogen shock absorber 1 can use existing equipment, including a shock absorber tower 4, a shock absorber piston rod 5, a shock absorber main cylinder 6, a shock absorber nitrogen cylinder 7, a shock absorber lower support 8, and a shock absorber lower bushing 9. The shock absorber tower 4 is located at the upper end of the nitrogen shock absorber assembly 1 and is used for assembly with the vehicle frame. The top end of the shock absorber piston rod 5 is connected to the shock absorber tower 4 through a bushing and bolts. The shock absorber piston rod 5 extends into the shock absorber main cylinder 6 and can reciprocate up and down within the shock absorber main cylinder 6. The shock absorber main cylinder 6 is used to store shock absorber oil. The shock absorber nitrogen cylinder 7 is located on the side of the shock absorber main cylinder 6 and is connected to the shock absorber main cylinder 6 through the shock absorber lower support 8. The high-pressure gas in the high-pressure nitrogen cylinder plays a role in compression buffering and rapid rebound. The shock absorber lower support 8 is located at the lower end of the nitrogen shock absorber 1, and its outer end is arc-shaped. The lower bushing 9 of the vibration damper is set at the bottom of the lower support 8 of the vibration damper. The nitrogen vibration damper 1 can use existing equipment. Further technical details are not described in detail here. In this embodiment, a compression state holding tool is designed to keep the nitrogen vibration damper in a compressed state for the existing nitrogen vibration damper.

[0023] The nitrogen vibration damper compression state holding tool includes a strap 3 and an auxiliary fixing member 2. The auxiliary fixing member 2 is used to be installed at the lower part of the nitrogen vibration damper 1 and is used to fix it to the outer end of the lower support 8 of the vibration damper. The inner end of the auxiliary fixing member 2 is provided with a fixing structure that matches the lower support 8 of the vibration damper. The auxiliary fixing member 2 can be fixed to the lower support 8 of the vibration damper through the fixing structure. In this embodiment, the fixing structure is a slot provided at the inner end of the auxiliary fixing member. Specifically, the inner end of the auxiliary fixing member 2 is open, and the open end faces the lower support of the nitrogen vibration damper assembly 1. A slot is formed on the open side of the auxiliary fixing member 2, and the shape of the slot matches the arc-shaped outer contour of the outer end of the lower support 8 of the vibration damper. After the snap-fit ​​component is snapped onto the outer end of the lower support 8 of the shock absorber via a snap-fit ​​groove, the inner surface of the snap-fit ​​groove is tightly fitted with the outer end surface of the lower support 8 of the shock absorber, forming an interference fit between the snap-fit ​​groove and the lower support 8 of the shock absorber. This snap-fit ​​achieves a fixed connection between the auxiliary fixing component 2 and the lower support 8 of the shock absorber. The outer end face of the auxiliary fixing component 2 is provided with a strap groove, which matches the strap and is used to accommodate and engage the strap 3. The bottom groove surface of the strap groove can be either flat or curved. When the bottom groove surface of the strap groove is flat, transition surfaces with a set acute angle to the flat surface are provided on both sides of the flat surface. The strap 3 is placed stably in the strap groove and transitions through the transition surfaces when it extends upwards. When the bottom groove surface of the strap groove is curved, the curved surface fits against the outer surface of the strap 3, increasing the contact area between the strap 3 and the strap groove, improving positioning accuracy and stability.

[0024] The auxiliary fixing component 2 has clearance grooves at both ends of its open side. These clearance grooves are used to avoid obstructing the lower bushing 9 of the nitrogen vibration damper 1. This prevents the lower bushing 9 from interfering with the fixing of the auxiliary fixing component 2 at the outer end of the lower support 8 of the vibration damper.

[0025] The lower bushing 9 of the shock absorber is located at the bottom end of the lower support 8 of the shock absorber. It is used to connect the nitrogen shock absorber 1 to the lower swing arm and provides certain damping and cushioning functions. The lower bushing 9 of the shock absorber is usually made of rubber material and has a certain outer diameter. The position of the clearance groove corresponds to the installation position of the lower bushing 9 of the shock absorber on the lower support 8 of the shock absorber. The clearance groove is a groove or notch, and the depth and width of the clearance groove match the outer diameter of the lower bushing 9 of the shock absorber. The clearance groove provides a receiving space for the lower bushing 9 of the shock absorber, so that when the auxiliary fixing part 2 is snapped into the lower support 8 of the shock absorber, the lower bushing 9 of the shock absorber can be accommodated in the clearance groove, avoiding interference between the auxiliary fixing part 2 and the lower bushing 9 of the shock absorber, and ensuring the smooth installation of the auxiliary fixing part 2.

[0026] The auxiliary fastener 2 is made of polyoxymethylene (POM). POM is a high-performance engineering plastic with high strength, high rigidity, low coefficient of friction, and good wear resistance. POM has high tensile and flexural strength, enabling it to withstand the significant pressure applied by the strap 3 without easily deforming or breaking. POM has a low surface friction coefficient, allowing it to slide smoothly and engage easily with the lower shock absorber support 8, reducing resistance during engagement. POM has good wear resistance; the groove of the auxiliary fastener 2 does not easily wear during repeated engagement and disengagement, maintaining engagement accuracy and firmness. POM has a low coefficient of thermal expansion; under different temperature conditions, the dimensions of the auxiliary fastener 2 change little, ensuring precise fit with the lower shock absorber support 8. POM has good corrosion resistance to most chemicals, resisting the erosion of oils, cleaning agents, and other chemicals in the automotive assembly environment, maintaining stable performance. Polyoxymethylene can be processed into complex shapes through injection molding and other methods, making it easy to manufacture auxiliary fasteners with structures such as slots, strap slots, and clearance slots.

[0027] The strap 3 is used to connect the damper tower top 4 and the auxiliary fixing member 2 of the nitrogen shock absorber 1, which is in a compressed state. The strap 3 is a snap-on strap, including a strap body and a snap-on clamp at one end of the strap body. The strap body is a flexible strip structure, long enough to wrap around the damper tower top 4 and the auxiliary fixing member 2 of the nitrogen shock absorber to form a closed loop. The strap body is made of nylon material. Nylon material has high tensile strength, good flexibility and wear resistance, and can withstand the large tensile force generated by the strap 3 when maintaining the nitrogen shock absorber in a compressed state. Nylon material also has good anti-aging properties and chemical corrosion resistance, and can maintain stable performance for a long time in the automotive assembly environment. Nylon has a low density, and the strap 3 is lightweight, making it easy for operators to carry and handle.

[0028] A snap-on clamp is located at one end of the belt body to connect and fix the two ends of the belt body to form a closed loop structure.

[0029] The buckle strap can be made using existing technology, and its further technical details will not be described in detail here. When in use, one movable end of the strap can pass through the channel of the buckle clamp, and then be clamped and fixed by the serrated clamping part of the buckle clamp. By the length of the strap passing through the buckle clamp, the size of the closed loop structure formed by the strap can be adjusted, so that the closed loop structure formed can be close to both ends of the nitrogen vibration damper 1 in the compressed state, so that the nitrogen vibration damper 1 is maintained in the compressed state.

[0030] In this embodiment, when the nitrogen vibration damper 1 is compressed to the design length, it is considered that the nitrogen vibration damper 1 is compressed to the compression state. The design length is the length of the nitrogen vibration damper 1 after compression when it is installed. Those skilled in the art can determine this based on the actual working conditions of the chassis, and it will not be described in detail here.

[0031] The auxiliary fastener 2 is secured to the outer end of the lower support 8 of the vibration damper via a slot. The strap 3 starts from the slot of the auxiliary fastener 2, wraps upwards around the top 4 of the nitrogen vibration damper 1, and then returns downwards to the slot of the auxiliary fastener 2. During the wrapping process, the strap 3 is in close contact with the outer surface of the top 4 of the vibration damper and the bottom groove of the slot of the auxiliary fastener 2. The two ends of the strap 3 are connected and secured by snap-fit ​​fasteners, forming a closed-loop structure. This closed-loop structure applies a compressive force to the nitrogen vibration damper 1, which acts between the top 4 of the vibration damper and the auxiliary fastener 2, keeping the nitrogen vibration damper in a compressed state. Due to the upward rebound force generated by the high-pressure nitrogen gas inside the nitrogen vibration damper, the tension of the closed-loop structure balances the rebound force, thus locking the nitrogen vibration damper in a compressed state at its designed length.

[0032] Because the outer end face of the lower support 8 of the vibration damper is an arc surface, if the strap 3 is directly attached to the outer end face of the lower support 8, it is easy for the strap 3 to separate from the outer end face of the lower support 8 under the tensile force of the nitrogen vibration damper 1. Therefore, an auxiliary fixing component 2 is provided. The strap groove of the auxiliary fixing component 2 positions and guides the strap 3, preventing the strap 3 from sliding or shifting on the surface of the nitrogen vibration damper. The auxiliary fixing component 2 is fixed to the lower support 8 of the vibration damper through the groove, providing a stable lower fixing point for the strap 3. The top of the vibration damper tower 4 provides an upper wrapping point for the strap 3. The strap 3, the auxiliary fixing component 2, and the nitrogen vibration damper 1 together form a stable force transmission path, realizing the reliable maintenance of the compressed state of the nitrogen vibration damper.

[0033] The auxiliary fastener 2 is connected to the lower support 8 of the nitrogen damper via a snap-fit ​​connection. The groove of the auxiliary fastener 2 matches the shape of the outer end of the lower support 8 of the damper, and the inner surface of the groove fits tightly against the outer end of the lower support 8 of the damper. This snap-fit ​​connection allows for quick assembly and disassembly, facilitating rapid installation and removal of the auxiliary fastener 2 by operators during assembly. The clearance groove of the auxiliary fastener 2 forms a clearance fit with the lower bushing 9 of the damper, providing space for the lower bushing 9 and preventing interference between the auxiliary fastener 2 and the lower bushing 9 when snapped onto the lower support 8 of the damper.

[0034] When the compression holding tool is in use, the strap 3 and the auxiliary fixing part 2 form a positioning engagement relationship through the strap groove. The strap body of the strap 3 is accommodated in the strap groove, and the strap groove limits the strap 3 to prevent it from shifting during use. The strap 3 and the shock absorber tower top 4 form a wrapping engagement relationship. The strap body of the strap 3 wraps around the outer surface of the shock absorber tower top 4 and is in close contact with the outer surface of the shock absorber tower top 4.

[0035] In its free state, the nitrogen shock absorber piston rod 5 is in an extended state due to the action of the internal high-pressure nitrogen gas. During assembly, the nitrogen shock absorber needs to be compressed to its designed length to facilitate the assembly of chassis components.

[0036] When using the compression-state holding tool, firstly, attach the auxiliary fixing part 2 to the outer end of the lower support 8 of the nitrogen vibration damper 1. The slot of the auxiliary fixing part 2 fits tightly with the outer end of the lower support 8 of the vibration damper, achieving a fixed connection between the auxiliary fixing part 2 and the nitrogen vibration damper 1. Then, the nitrogen vibration damper 1 is compressed to the designed length manually or mechanically. During the compression process, the vibration damper piston rod 5 moves downward, and the oil in the main cylinder 6 of the vibration damper flows into the nitrogen cylinder 7 of the vibration damper through the lower support 8, further compressing the high-pressure nitrogen. When the nitrogen vibration damper reaches the designed length, the strap 3 starts from the strap slot of the auxiliary fixing part 2, goes upward around the top of the vibration damper tower 4, and then returns downward to the strap slot of the auxiliary fixing part 2. The two ends of the strap 3 are connected and fixed by a snap-on clamp, forming a closed-loop structure. The closed-loop structure applies a compressive force to the nitrogen vibration damper 1, which acts between the top of the vibration damper tower 4 and the auxiliary fixing part 2. Because the auxiliary fixing part 2 is snapped onto the lower support 8 of the shock absorber, the compressive force is transmitted to the lower support 8 of the shock absorber through the auxiliary fixing part 2, and the compressive force is directly transmitted to the top of the shock absorber tower 4, and then to the overall structure of the nitrogen shock absorber 1. The compressive force of the closed-loop structure is balanced by the upward rebound force generated by the high-pressure nitrogen inside the nitrogen shock absorber 1, keeping the nitrogen shock absorber 1 in a compressed state at its designed length. In the compressed state, the nitrogen shock absorber 1 can be easily assembled with the frame and the lower control arm.

[0037] It is understandable that, besides the interference fit between the auxiliary fastener 2 and the lower support 8 of the shock absorber, other fastening methods can also be used. For example, the slot of the auxiliary fastener 2 can be magnetically attached to the lower support 8 of the shock absorber. Magnetic material or a magnet is placed inside the slot of the auxiliary fastener 2. The lower support 8 of the shock absorber is made of ferromagnetic material, or a layer of ferromagnetic material is placed on the outer end of the lower support 8. The auxiliary fastener 2 is magnetically attracted to the outer end of the lower support 8. Magnetic fastening has the advantages of quick installation and no need for precise alignment, but its reliability may not be as good as the snap-fit ​​fastening method, making it suitable for scenarios with low fixing force requirements or temporary fixation.

[0038] The auxiliary fastener 2 can be connected to the lower support 8 of the shock absorber via a threaded connection. The inner end of the auxiliary fastener 2 has a threaded hole. The outer end of the lower support 8 of the shock absorber has a threaded boss or bolt that mates with the threaded hole. The auxiliary fastener 2 is connected to the lower support 8 of the shock absorber by rotating and tightening. The threaded connection method has the advantages of reliable fixation and strong load-bearing capacity, but the installation and disassembly operations are relatively complex, requiring the use of tools such as wrenches, and the operation time is relatively long. It is suitable for scenarios where high fixation reliability is required, but the efficiency of installation and disassembly is not critical.

[0039] In this embodiment, the nitrogen shock absorber compression state holding tool achieves reliable maintenance of the nitrogen shock absorber 1's compression state through the cooperation of auxiliary fixing part 2 and strap 3. Auxiliary fixing part 2 is fixed to the lower support 8 of the shock absorber via a slot, providing a stable lower fixing point for strap 3. The clearance groove of auxiliary fixing part 2 avoids interference with the lower bushing 9 of the shock absorber, ensuring smooth installation of auxiliary fixing part 2. Strap 3 uses a snap-on binding strap, which has quick locking and unlocking functions, improving assembly efficiency. The strap body of strap 3 is made of nylon material, which has high tensile strength and good flexibility, and can withstand large tensile forces. Auxiliary fixing part 2 is made of polyoxymethylene material, which has high strength and good wear resistance, ensuring service life. The compressive force generated by the closed-loop structure is balanced with the rebound force of the high-pressure nitrogen inside the nitrogen shock absorber 1, achieving stable maintenance of the nitrogen shock absorber 1's compression state. Assembly under compression state ensures the assembly position accuracy of chassis components, avoids bushing sway and torsion, and reduces the risk of chassis noise. The strap 3 and auxiliary fastener 2 are recyclable, reducing production costs and meeting environmental protection requirements. The nitrogen vibration damper compression state holding tool in this embodiment has a simple structure and is easy to operate, effectively solving the problems of compression and assembly difficulties during the assembly process of the nitrogen vibration damper.

[0040] Example 2 This embodiment provides a method for using a tool to maintain the compression state of a nitrogen shock absorber, such as... Figure 4 As shown, it includes the following steps: Step S1: The auxiliary fixing part 2 is snapped onto the outer end of the lower support 8 of the nitrogen vibration damper 1. The auxiliary fixing part 2 is snapped onto the outer end of the lower support 8 of the vibration damper through a slot.

[0041] Step S2: Compress the nitrogen vibration damper 1 to the designed length so that the nitrogen vibration damper is in a compressed state.

[0042] Step S3: A strap 3 is wrapped between the auxiliary fixing part 2 and the top of the vibration tower 4 of the nitrogen vibration damper 1, and the closed loop structure formed by the strap 3 is used to keep the nitrogen vibration damper 1 in a compressed state. Step S4: Assemble the compressed nitrogen shock absorber 1 with the frame and lower control arm; Step S5: After the components in the chassis that need to be assembled under the compression state of the nitrogen shock absorber are assembled, remove the strap 3 and the auxiliary fastener 2.

[0043] In step S1, before assembling the nitrogen vibration damper 1, the auxiliary fixing component 2 is prepared. The operator holds the main damper cylinder 6 of the nitrogen vibration damper assembly 1 with one hand and the auxiliary fixing component 2 with the other. The open end of the auxiliary fixing component 2 is aligned with the outer end of the lower support 8 of the nitrogen vibration damper 1. The slot of the auxiliary fixing component 2 is aligned with the outer end of the lower support 8. The operator applies force axially to the nitrogen vibration damper 1, pushing the auxiliary fixing component 2 towards the lower support 8. The slot of the auxiliary fixing component 2 gradually contacts the outer end of the lower support 8. Because the auxiliary fixing component 2 is made of polyoxymethylene material, it has a certain degree of elasticity, and the slot will slightly deform when it contacts the lower support 8. Continue to push the auxiliary fixing component 2 until the slot is fully engaged with the outer end of the lower support 8. At this point, the inner surface of the slot is tightly fitted with the outer end of the lower support 8 of the shock absorber, forming an interference fit. The auxiliary fastener 2 is fixed to the lower support 8 of the shock absorber by a snap-fit ​​mechanism. The clearance groove of the auxiliary fastener 2 provides space for the lower bushing 9 of the shock absorber, avoiding interference between the auxiliary fastener 2 and the lower bushing 9. The operator can check whether the auxiliary fastener 2 is securely snapped onto the lower support 8 of the shock absorber by gently shaking it. The snap-fit ​​operation is simple and quick, requiring no additional tools or fasteners, thus improving assembly efficiency.

[0044] In step S2, after the auxiliary fastener 2 is engaged, the nitrogen shock absorber 1 needs to be compressed to its designed length. The designed length of the nitrogen shock absorber refers to the compression length that the nitrogen shock absorber 1 needs to reach during assembly to ensure the accuracy of the chassis component assembly position. The designed length varies depending on the vehicle model and chassis structure, and is usually determined by the design department based on assembly process requirements. There are two ways to compress the nitrogen shock absorber 1: manual compression and mechanical compression. In manual compression, the operator uses a pry bar as a compression tool. One end of the pry bar rests against the top 4 of the nitrogen shock absorber tower, and the other end rests against a fixed support point, such as the vehicle frame or workbench. The operator applies downward pressure to the nitrogen shock absorber 1 by prying the pry bar, utilizing the lever principle. During compression, the shock absorber piston rod 5 moves downward, and the oil in the main cylinder 6 flows into the nitrogen cylinder 7 through the lower support 8. The high-pressure nitrogen in the high-pressure nitrogen cylinder 7 is further compressed, generating an upward rebound force. The operator needs to continuously apply pressure to overcome the rebound force of the high-pressure nitrogen gas and compress the nitrogen gas damper 1 to the designed length.

[0045] Operators can use measuring tools, such as tape measures or calipers, to measure the length of the nitrogen vibration damper 1 from the top 4 of the damper tower to the outer end face of the lower support 8, ensuring that the designed length is achieved. Manual compression is suitable for small-batch production or maintenance scenarios, offering flexibility but requiring significant labor. In mechanical compression, operators use specialized compression equipment to compress the nitrogen vibration damper 1. Existing equipment can be used, including a fixing clamp, a compression mechanism, and a control system. The fixing clamp is used to secure the nitrogen vibration damper 1, preventing it from moving or tilting during compression. The fixing clamp typically includes two or more clamping blocks that can hold the main damper cylinder 6 or the lower support 8 of the nitrogen vibration damper. The compression mechanism typically uses a hydraulic or pneumatic cylinder, capable of providing a large compression force. The piston rod of the compression mechanism can move downwards, applying downward pressure to the top 4 of the damper tower of the nitrogen vibration damper 1. The control system is used to control the movement of the compression mechanism, achieving precise compression of the nitrogen vibration damper 1.

[0046] Mechanical compression is suitable for mass production, offering high compression accuracy, low labor intensity, and high production efficiency. Regardless of whether manual or mechanical compression is used, once the nitrogen vibration damper 1 reaches its designed length, the next step, namely, wrapping the strap 3, is required immediately to maintain the compressed state of the nitrogen vibration damper 1.

[0047] In step S3, while the nitrogen vibration damper 1 is compressed to its designed length and maintained in a compressed state, the operator prepares the binding strap 3. The binding strap 3 is a snap-on binding strap, including a strap body and a snap-on clamp. The operator maintains the compressed state of the nitrogen vibration damper 1, or the compression equipment continues to maintain the compressed state of the nitrogen vibration damper 1, while the operator operates the binding strap 3. The operator places one end of the strap body of the binding strap 3 into the binding strap slot of the auxiliary fixing member 2. The binding strap slot positions the binding strap 3, preventing the binding strap 3 from slipping off the auxiliary fixing member 2 during subsequent wrapping. Then, the operator pulls the strap body of the binding strap 3 upwards, around the damper tower top 4 of the nitrogen vibration damper. The strap body of the binding strap 3 is in close contact with the outer surface of the damper tower top 4. After around the damper tower top 4, the operator pulls the strap body of the binding strap 3 downwards and secures it with the snap-on clamp. At this point, the strap body of the binding strap 3 forms a loop around the nitrogen vibration damper. The operator connects the other end of the strap 3 to the end with the snap-on clamp.

[0048] The operator can gently pull the strap 3 to check if the snap-fit ​​clamp is securely locked. If the snap-fit ​​clamp can withstand the tension without coming loose, it indicates that the strap 3 has formed a closed-loop structure. The closed-loop structure applies compressive force to the nitrogen vibration damper. This compressive force is located between the damper tower top 4 and the auxiliary fixing member 2. Since the auxiliary fixing member 2 is engaged with the lower support 8 of the damper, the compressive force is transmitted to the lower support 8 of the damper through the auxiliary fixing member 2, and then to the overall structure of the nitrogen vibration damper. The compressive force is also transmitted to the nitrogen vibration damper 1 through the damper tower top 4. The compressive force of the closed-loop structure is balanced by the upward rebound force generated by the high-pressure nitrogen inside the nitrogen vibration damper 1. At this time, the operator can release the compressive force on the nitrogen vibration damper, or the compression equipment can stop compressing the nitrogen vibration damper 1. Under the action of the compressive force of the closed-loop structure, the nitrogen vibration damper remains in a compressed state at the designed length and will not automatically rebound. The strap 3 is made of nylon, which has high tensile strength and can withstand the large rebound force generated by the high-pressure nitrogen gas inside the nitrogen shock absorber 1. The strap groove limits the strap 3, preventing it from shifting or sliding during use. The closed-loop structure is simple and quick to form, requiring no complicated tools or equipment, thus improving assembly efficiency.

[0049] In step S4, after the nitrogen shock absorber 1 is held in a compressed state by the straps 3, the operator can assemble the nitrogen shock absorber with the frame and the lower control arm. The assembly process includes connecting the upper mounting point to the frame and the lower mounting point to the lower control arm.

[0050] The upper mounting point is the mounting point of the shock absorber tower top 4 for connection with the vehicle frame, and the lower mounting point is the mounting point of the shock absorber lower support 8 for connection with the lower control arm. The connection method of the nitrogen shock absorber 1 with the vehicle frame and the lower control arm can be adopted using existing technology, and will not be described in detail here.

[0051] Because the nitrogen shock absorber 1 is kept in a compressed state during assembly, the lower control arm is positioned in its designed state, not its lower limit stretched state. In the designed state, the bushings on the lower control arm are in their normal positions, without yaw or torsion. The bushings are not subjected to additional torsional or yaw forces, avoiding problems such as bushing misalignment, bushing rubber deformation, or false torque. This ensures the assembly accuracy of chassis components, reduces the risk of chassis noise, and improves chassis performance stability. After the nitrogen shock absorber 1 is connected to the frame and lower control arm, the operators continue assembling other chassis components.

[0052] In step S5, after the nitrogen shock absorber is connected to the frame and lower control arm, some chassis components still need to be assembled while the nitrogen shock absorber is under compression. These components include the stabilizer bar connecting rod and the brake steering knuckle. During the assembly of the stabilizer bar connecting rod, the stabilizer bar connecting rod connects the stabilizer bar and the lower control arm, stabilizing the vehicle's attitude. The operator connects one end of the stabilizer bar connecting rod to the stabilizer bar and the other end to the lower control arm. Because the nitrogen shock absorber is in a compressed state, the lower control arm is in its designed position, and the mounting holes of the stabilizer bar connecting rod can be accurately aligned with the mounting holes of the lower control arm. The operator uses bolts to fix the stabilizer bar connecting rod to the stabilizer bar and the lower control arm. During the assembly of the brake steering knuckle, the brake steering knuckle is an important chassis component used to connect the wheel and the lower control arm and to install the brake. The operator connects the brake steering knuckle to the lower control arm. Because the nitrogen shock absorber is in a compressed state, the lower control arm is in its designed position, and the mounting holes of the brake steering knuckle can be accurately aligned with the mounting holes of the lower control arm. The operator uses bolts to secure the brake steering knuckle to the lower control arm.

[0053] The assembly methods for the stabilizer bar connecting rod and the brake steering knuckle can be achieved using existing technologies and will not be described in detail here.

[0054] After the chassis components such as the stabilizer bar connecting rod and brake steering knuckle are assembled, the nitrogen shock absorber compression state holding tool has completed its work. At this time, the operator needs to remove the strap 3 and auxiliary fixing part 2 to restore the nitrogen shock absorber 1 to its normal working state. When removing the strap 3, the operator locates the snap-on clamp of the strap 3. The operator releases the strap 3 from the snap-on clamp by operating the snap-on clamp, thus releasing the closed-loop structure of the strap 3. The operator removes the strap 3 from the shock absorber tower top 4 and the auxiliary fixing part 2 of the nitrogen shock absorber. When removing the auxiliary fixing part 2, the operator holds the main shock absorber cylinder 6 of the nitrogen shock absorber with one hand and the auxiliary fixing part 2 with the other hand. The operator applies force along the axial direction of the nitrogen shock absorber 1 to pull the auxiliary fixing part 2 off the lower support 8 of the shock absorber. Because the auxiliary fastener 2 is made of polyoxymethylene material, which has a certain degree of elasticity, the slot will deform slightly during the pulling process, thus detaching from the outer end of the lower support 8 of the shock absorber. After removing the auxiliary fastener 2, the engagement between the auxiliary fastener 2 and the lower support 8 of the shock absorber is released.

[0055] After the straps 3 and auxiliary fasteners 2 are removed, the nitrogen shock absorber is no longer constrained by the tensile force of the closed-loop structure. The high-pressure nitrogen inside the shock absorber generates an upward rebound force, pushing the shock absorber piston rod 5 upward. The nitrogen shock absorber gradually returns from a compressed state to a normal operating state. Since the upper mounting point of the nitrogen shock absorber 1 is connected to the vehicle frame and the lower mounting point is connected to the lower control arm, the nitrogen shock absorber 1 is constrained by the vehicle frame and the lower control arm during the recovery process, eventually reaching its normal operating length. At this point, the nitrogen shock absorber 1 can perform its damping function normally, attenuating vibrations generated by the road surface and improving the ride comfort of the vehicle. The removed straps 3 and auxiliary fasteners 2 should not be discarded arbitrarily. Operators should place the removed straps 3 and auxiliary fasteners 2 into a dedicated recycling box for collection. The recycling box is located at a designated position on the assembly line for easy disposal by operators. The straps 3 and auxiliary fasteners 2 in the recycling box are collected periodically by designated personnel and returned to the factory or a designated location for cleaning, inspection, and maintenance. After cleaning and inspection, the straps 3 and auxiliary fasteners 2 can be reused, reducing production costs and meeting the requirements of environmental protection and sustainable development.

[0056] In some other embodiments, the nitrogen vibration damper 1 can be compressed using methods other than manual compression with a crowbar or compression with a dedicated hydraulic compression device. For example, a pneumatic compression device can be used to compress the nitrogen vibration damper. The pneumatic compression device includes a pneumatic cylinder, an air source, and a control valve. The piston rod of the pneumatic cylinder applies downward pressure to the top 4 of the damper tower of the nitrogen vibration damper. The air source provides compressed air, and the control valve controls the movement of the pneumatic cylinder. Pneumatic compression has the advantages of simple operation, adjustable compression force, and fast response speed, making it suitable for scenarios requiring both compression speed and force. Exemplarily, an electric compression device can be used to compress the nitrogen vibration damper. The compression device can also be an electric compression device, which includes a motor, a reducer, a lead screw, and a control system. The motor drives the lead screw to rotate, and the nut of the lead screw applies downward pressure to the top 4 of the damper tower of the nitrogen vibration damper. The control system controls the operation of the motor to achieve precise compression of the nitrogen vibration damper. Electric compression has the advantages of high compression accuracy, low noise, and low energy consumption, making it suitable for scenarios that require high compression accuracy and low environmental noise.

[0057] Understandably, gravity compression can also be used to compress the nitrogen vibration damper 1. The nitrogen vibration damper is placed vertically, and a weight is placed on the top 4 of the damper tower. The weight exerts a downward pressure on the nitrogen vibration damper 1, compressing it. Gravity compression has the advantages of simple structure and low cost, but the compression force is not easily adjustable, and the compression accuracy is relatively low. It is suitable for scenarios where high compression accuracy is not required and cost is a concern.

[0058] The usage method of this embodiment features a simple and quick snap-fit ​​operation for the auxiliary fixing component 2, requiring no additional tools or fasteners. The compression method of the nitrogen vibration damper is flexible, allowing for both manual and mechanical compression to adapt to different production scenarios. The wrapping and fixing operation of the strap 3 is simple, and the snap-fit ​​clamp has quick locking and unlocking functions. The closed-loop structure reliably maintains the compressed state of the nitrogen vibration damper, ensuring the stability of the assembly process. Assembly under compression ensures the assembly position accuracy of chassis components, preventing bushing sway and torsion. The removal of the strap 3 and auxiliary fixing component 2 is simple and will not damage the nitrogen vibration damper or other components. The strap 3 and auxiliary fixing component 2 are recyclable, reducing production costs and meeting environmental protection requirements. The usage method of this embodiment effectively solves the problems of difficult compression and assembly of the nitrogen vibration damper during the assembly process.

[0059] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tool for maintaining the compressed state of a nitrogen vibration damper, characterized in that, The device includes an auxiliary fixing component and a strap. The inner end of the auxiliary fixing component is provided with a fixing structure that matches the outer end of the lower support of the nitrogen vibration damper. The auxiliary fixing component can be fixed to the outer end of the lower support of the vibration damper through the fixing structure. The outer end face of the auxiliary fixing component is provided with a strap groove that matches the strap. The strap is used to wrap around the top of the vibration damper tower of the nitrogen vibration damper in the compressed state and the auxiliary fixing component to keep the nitrogen vibration damper in the compressed state through the closed loop structure formed by the strap.

2. The nitrogen damper compression state holding tool as described in claim 1, characterized in that, The fixing structure adopts a slot set at the inner end of the auxiliary fixing component. The slot matches the outer end of the lower support of the shock absorber, and the auxiliary fixing component can be fixed to the outer end of the lower support of the shock absorber through the slot.

3. The nitrogen vibration damper compression state holding tool as described in claim 1, characterized in that, The strap is a snap-on binding strap, including a strap body and a snap-on clamp set at one end of the strap body; Preferably, the belt is made of nylon material.

4. The nitrogen vibration damper compression state holding tool as described in claim 1, characterized in that, The auxiliary fastener is made of polyoxymethylene material.

5. A nitrogen vibration damper compression state holding tool as described in claim 1, characterized in that, The bottom surface of the strap slot is either flat or curved.

6. The nitrogen vibration damper compression state holding tool as described in claim 1, characterized in that, The open side of the auxiliary fastener is provided with a clearance groove to avoid the lower bushing of the nitrogen gas damper.

7. A method of using the nitrogen vibration damper compression state holding tool according to any one of claims 1-6, characterized in that, Includes the following steps: Step S1: Attach the auxiliary fixing piece to the end of the lower support of the nitrogen shock absorber; Step S2: Compress the nitrogen vibration damper to the designed length so that the nitrogen vibration damper is in a compressed state; Step S3: Wrap a strap between the auxiliary fixing component and the top of the nitrogen vibration damper, and use the closed loop structure formed by the strap to keep the nitrogen vibration damper in a compressed state. Step S4: Assemble the compressed nitrogen shock absorber with the frame and lower control arm; Step S5: After the components in the chassis that need to be assembled under the compression state of the nitrogen shock absorber are assembled, remove the straps and auxiliary fasteners.

8. The method of using the nitrogen vibration damper compression state holding tool as described in claim 7, characterized in that, The components in the chassis that need to be assembled under nitrogen-filled shock absorber compression are the stabilizer bar connecting rod and the brake steering knuckle.

9. The method of using the nitrogen vibration damper compression state holding tool as described in claim 7, characterized in that, The nitrogen shock absorber can be manually compressed to a compressed state using a crowbar or by using a compression device.

10. The method of using the nitrogen vibration damper compression state holding tool as described in claim 7, characterized in that, After removing the straps and auxiliary fasteners, place them in the recycling box for collection.

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