A double valve straight cylinder shock absorber

Abstract

The disclosed dual-valve cylindrical shock absorber features an oil passage gap between the inner and outer oil cylinders, which communicates with the interior of the inner oil cylinder. The inner and outer oil cylinders are fixed to one end of an adjusting cylinder, while the air cylinder is fixed to the other end; they are coaxially aligned. The adjusting cylinder contains a main oil passage and a side oil passage. One end of the main oil passage communicates with the interior of the inner oil cylinder, and one end of the side oil passage communicates with the oil passage gap. The other ends of the main and side oil passages converge and communicate with the interior of the air cylinder. The interior of the inner oil cylinder is divided into a first and second oil chamber by a solid piston, while the interior of the air cylinder is divided into a third oil chamber and an air chamber by a floating piston. A compression damping regulating valve is located in the main oil passage to regulate the oil flow from the second to the third oil chamber, and a rebound damping regulating valve is located in the side oil passage to regulate the oil flow from the oil passage gap to the third oil chamber. This shock absorber offers enhanced overall design, a more aesthetically pleasing appearance, and a smaller footprint. It also provides sensitive response and more precise and reliable adjustment.

Description

Technical Field

[0001] This utility model relates to a shock absorber, specifically a cylindrical shock absorber with two valves. Background Technology

[0002] Shock absorbers, widely used in automobiles, are used to suppress the oscillations caused by the rebound of the shock-absorbing springs and the impact from the road surface, thereby improving the ride smoothness of the vehicle. When driving over uneven roads, although the shock-absorbing springs can filter out road vibrations, the springs themselves will still have reciprocating motion. The shock absorber is used to suppress this spring bounce. Therefore, as a damping element, the shock absorber is one of the important components of the automobile suspension system, playing a decisive role in the ride smoothness, comfort, safety, and steering handling of the vehicle.

[0003] Existing shock absorbers typically have an auxiliary air cylinder next to the main cylinder to increase the working stroke. However, this auxiliary air cylinder takes up a lot of space, limiting the installation of the shock absorber in certain environments. Furthermore, the connection between the auxiliary air cylinder and the main cylinder is relatively weak and prone to damage. When the damping oil circulates in the main cylinder and the auxiliary air cylinder, it needs to make large-angle turns, resulting in damping lag. In addition, such shock absorbers are usually equipped with a two-way piston valve system. The two-way piston valve system allows damping oil to pass through during compression or rebound. Although this can effectively enhance the damping effect, it also makes the switching between compression and rebound of the shock absorber slower, causing damping lag. High damping lag will reduce the response frequency of the shock absorber, and after being impacted, it cannot quickly return to its original state, reducing the vehicle's driving stability.

[0004] In addition, there are also shock absorbers on the market with dual valve adjustment, which claim to achieve independent adjustment of the shock absorber's compression damping and rebound damping. However, in actual use, because the compression regulating valve and the rebound regulating valve exist in both the compression circuit and the rebound circuit of the damping oil, the adjustment between the two valves will interfere with each other, making it difficult to achieve precise adjustment of the shock absorber's damping. For example, when only the compression damping needs to be adjusted, after adjusting the valve needle position of the compression regulating valve, the damping oil in the rebound circuit also needs to flow back through the compression regulating valve, which changes the resistance of the entire rebound circuit, i.e., the rebound damping. At this time, adjusting the rebound damping through the rebound regulating valve will also affect the already adjusted compression damping. Utility Model Content

[0005] To address the shortcomings of existing shock absorbers in the background art, namely to improve the response frequency of the shock absorber and reduce the mutual interference between the compression regulating valve and the rebound regulating valve when adjusting the damping, this utility model provides a double-valve straight-tube shock absorber, which includes an inner oil cylinder, an outer oil cylinder, an adjusting cylinder, an air cylinder, a piston rod, a solid piston, a floating piston, a compression damping regulating valve, and a rebound damping regulating valve.

[0006] The inner oil cylinder is located inside the outer oil cylinder, and the gap between the inner and outer oil cylinders forms an oil passage gap. The end of the oil passage gap away from the regulating cylinder is connected to the interior of the inner oil cylinder.

[0007] The inner oil cylinder and the outer oil cylinder are fixedly connected to one end of the regulating cylinder body, and the air cylinder is fixedly connected to the other end of the regulating cylinder body. The inner oil cylinder, the outer oil cylinder, the regulating cylinder body and the air cylinder are coaxially arranged.

[0008] The regulating cylinder is divided into a main oil passage and a side oil passage. One end of the main oil passage is connected to the inside of the inner oil cylinder, and one end of the side oil passage is connected to the oil passage gap. The other ends of the main oil passage and the other ends of the side oil passage are combined and connected to the inside of the air cylinder.

[0009] The interior of the inner oil cylinder is divided into a first oil chamber and a second oil chamber by a solid piston on the piston rod, with the second oil chamber being closer to the regulating cylinder; the interior of the air cylinder is divided into a third oil chamber and an air chamber by a floating piston, with the third oil chamber being closer to the regulating cylinder.

[0010] Both the compression damping regulating valve and the rebound damping regulating valve are installed on the regulating cylinder. The compression damping regulating valve is located at the main oil circuit and is used to regulate the oil flow from the second oil chamber to the third oil chamber. The rebound damping regulating valve is located at the side oil circuit and is used to regulate the oil flow from the oil gap to the third oil chamber.

[0011] Preferably, both the compression damping regulating valve and the rebound damping regulating valve include a valve seat, a forward-flow elastic valve plate, a reverse-flow annular valve plate, a central pressure block, a reverse-flow spring, a damping regulating tube, a valve sleeve, a valve needle, and a knob. The valve seat of the compression damping regulating valve is fixedly installed at the main oil circuit of the regulating cylinder, and the valve seat of the rebound damping regulating valve is fixedly installed at the side oil circuit of the regulating cylinder. In each damping regulating valve:

[0012] The valve seat has a forward flow channel and a reverse flow channel. The forward flow elastic valve plate and the reverse flow annular valve plate are respectively located at both ends of the valve seat, and the reverse flow annular valve plate is located at the end closer to the oil passage. The forward flow elastic valve plate can fit against the corresponding end face of the valve seat under the limitation of the central pressure block and only close the forward flow channel. The reverse flow annular valve plate can fit against the corresponding end face of the valve seat under the elastic force of the reverse flow spring and only close the reverse flow channel.

[0013] The damping adjustment tube is axially inserted through the valve seat. A valve sleeve is provided next to the damping adjustment tube, and a valve needle is provided inside the valve sleeve. The middle part of the valve needle and the valve sleeve are threaded together. The tip of the valve needle is located inside the damping adjustment tube. An oil passage hole is provided on the side of the valve sleeve near the tip of the valve needle. The oil passage hole communicates with the damping adjustment tube. A knob is fixedly connected to the end of the valve needle. By adjusting the depth of the valve needle tip in the damping adjustment tube by turning the knob, the oil flow of the damping adjustment tube can be adjusted.

[0014] The working principle of the above-mentioned double-valve cylindrical shock absorber is as follows:

[0015] When the solid piston compresses downwards, the damping oil in the second oil chamber first passes through the main oil circuit, then through the compression damping regulating valve, and finally enters the third oil chamber. The damping oil in the third oil chamber first passes through the rebound damping regulating valve, then through the side oil circuit, and finally enters the oil passage, thus forming the entire compression circuit. When the oil passes through the compression damping regulating valve according to the above circuit, it is a forward flow. A portion of the damping oil enters its forward flow channel and pushes open the forward flow elastic valve plate. That is, the forward flow elastic valve plate will undergo elastic deformation under the impact of oil pressure, and the outer edge will slightly lift up to allow the damping oil to pass through. This generates a certain resistance while ensuring the minimum flow rate of the compression circuit. The remaining damping oil will be diverted into the damping regulating pipe of the compression damping regulating valve. The oil flow rate is adjusted by the valve needle, thereby adjusting the damping of the compression circuit. When the damping oil passes through the rebound damping regulating valve from the third oil chamber, it flows backward. The forward flow channel of the rebound damping regulating valve remains closed, and the damping oil enters its reverse flow channel, pushing open the reverse flow annular valve plate. Since it only needs to overcome the elastic force of the reverse flow spring, the resistance at the reverse flow channel is much smaller than the resistance formed by the valve needle at the damping regulating tube. Therefore, most of the damping oil will pass through the reverse flow channel during reverse flow. The position of the valve needle of the rebound damping regulating valve will not significantly affect the resistance during reverse flow and can be ignored. This allows the damping adjustment of the entire compression circuit to be mainly achieved by the compression damping regulating valve, making the adjustment of the shock absorber's compression damping more precise and reliable.

[0016] When the solid piston rebounds upwards, the damping oil in the first oil chamber first passes through the oil passage and side oil circuit, then through the rebound damping regulating valve and enters the third oil chamber. The damping oil in the third oil chamber first passes through the compression damping regulating valve, then through the main oil circuit and enters the second oil chamber, thus forming the entire rebound circuit. When the oil passes through the rebound damping regulating valve according to the above circuit, it is a forward flow. A portion of the damping oil enters its forward flow channel and pushes open the forward flow elastic valve plate. That is, the forward flow elastic valve plate will undergo elastic deformation under oil pressure impact, and the outer edge will slightly lift up to allow the damping oil to pass through, generating a certain resistance while ensuring the minimum flow of the rebound circuit. The remaining damping oil will be diverted into the damping regulating pipe of the rebound damping regulating valve, and then... The valve needle is used to adjust the oil flow rate, thereby adjusting the damping of the rebound circuit. When the damping oil passes through the compression damping regulating valve from the third oil chamber, it flows in reverse. The forward flow channel of the compression damping regulating valve remains closed, and the damping oil enters its reverse flow channel, pushing open the reverse flow annular valve plate. Since it only needs to overcome the elastic force of the reverse flow spring, the resistance at the reverse flow channel is much smaller than the resistance formed by the valve needle at the damping regulating tube. Therefore, most of the damping oil will pass through the reverse flow channel during reverse flow. The position of the valve needle of the compression damping regulating valve will not significantly affect the resistance during reverse flow and can be ignored. This makes the damping adjustment of the entire rebound circuit mainly rely on the rebound damping regulating valve, making the adjustment of the shock absorber's rebound damping more precise and reliable.

[0017] Furthermore, the aforementioned dual-valve cylindrical shock absorber also includes an adjusting ring, a separating collar, a limiting ring, an auxiliary spring, and a shock-absorbing spring;

[0018] Both the adjusting ring and the separating sleeve are fitted onto the outer oil cylinder, with the separating sleeve positioned above the adjusting ring. The adjusting ring and the outer oil cylinder are threaded together, and the separating sleeve can move along the direction of the outer oil cylinder. The limiting ring is fixedly connected to the end of the piston rod. The auxiliary spring is positioned between the adjusting ring and the separating sleeve, and the damping spring is positioned between the separating sleeve and the limiting ring. The pitch of the auxiliary spring is smaller than that of the damping spring. This auxiliary spring design allows the compression stroke of the shock absorber to be longer, enabling it to absorb more impact energy.

[0019] Through the above technical solutions, this utility model has at least the following beneficial effects:

[0020] The dual-valve straight-tube shock absorber described in this application has its inner oil cylinder, outer oil cylinder, adjusting cylinder, and air cylinder arranged coaxially. The coaxial connection of the oil cylinder and air cylinder is achieved through the adjusting cylinder, which makes the connection more reliable, the overall structure stronger, the appearance more aesthetically pleasing, and occupies less space. Moreover, the compression circuit and rebound circuit formed by it are more unobstructed. With the cooperation of the solid piston, the damping oil can switch between the compression circuit and the rebound circuit more quickly, reducing damping hysteresis, increasing the response frequency, and making the shock absorber more responsive. After being impacted, it can quickly return to its original state, improving the vehicle's driving stability.

[0021] In the preferred design, the structural design of the compression damping regulating valve and the rebound damping regulating valve ensures that the valve needle position does not significantly affect the resistance during backflow due to the presence of the backflow channel. The mutual interference caused by the valve needle adjustments of the compression damping regulating valve and the rebound damping regulating valve can be ignored. This allows the damping adjustment of the entire compression circuit to be mainly achieved by the compression damping regulating valve, and the damping adjustment of the entire rebound circuit to be mainly achieved by the rebound damping regulating valve. Ultimately, this makes the damping adjustment of the shock absorber more precise and reliable.

[0022] In a further design, the addition of an auxiliary spring allows the shock absorber to have a longer compression stroke, enabling it to absorb more impact energy. Attached Figure Description

[0023] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of this utility model in a schematic manner. Therefore, they only show the components related to this utility model.

[0024] Figure 1 This is a schematic diagram of the overall structure of a double-valve cylindrical shock absorber as described in the embodiments of this application;

[0025] Figure 2 This is a side view of a cylindrical shock absorber with two valves as described in the embodiments of this application;

[0026] Figure 3 for Figure 2 Sectional view of AA;

[0027] Figure 4 for Figure 2 Sectional view of BB;

[0028] Figure 5 This is a schematic diagram of the structure of the adjusting cylinder described in the embodiments of this application;

[0029] Figure 6 This is a schematic diagram of the structure of the separating collar described in the embodiments of this application. Detailed Implementation

[0030] In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships are for illustrative purposes only and should not be construed as limiting this patent. If terms such as "first" and "second" are used for descriptive purposes only, they should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of the stated features. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0031] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] refer to Figures 1 to 6 A type of straight-tube shock absorber with two valves includes an inner oil cylinder 1, an outer oil cylinder 2, an adjusting cylinder 3, an air cylinder 4, a piston rod 5, a solid piston 6, a floating piston 7, a compression damping adjusting valve 8, and a rebound damping adjusting valve 9.

[0033] The inner oil cylinder 1 is disposed inside the outer oil cylinder 2, and the gap between the inner oil cylinder 1 and the outer oil cylinder 2 forms an oil passage gap 102. The end of the oil passage gap 102 away from the regulating cylinder 3 is connected to the interior of the inner oil cylinder 1.

[0034] The inner oil cylinder 1 and the outer oil cylinder 2 are fixedly connected to one end of the adjusting cylinder 3, and the air cylinder 4 is fixedly connected to the other end of the adjusting cylinder 3. The inner oil cylinder 1, the outer oil cylinder 2, the adjusting cylinder 3 and the air cylinder 4 are arranged coaxially.

[0035] The regulating cylinder 3 is divided into a main oil passage 301 and a side oil passage 302. One end of the main oil passage 301 is connected to the inside of the inner oil cylinder 1, and one end of the side oil passage 302 is connected to the oil passage gap 102. The other end of the main oil passage 301 and the other end of the side oil passage 302 are combined and connected to the inside of the air cylinder 4.

[0036] The interior of the inner oil cylinder 1 is divided into a first oil chamber 1601 and a second oil chamber 1602 by a solid piston 6 on the piston rod 5, with the second oil chamber 1602 being close to the adjusting cylinder 3; the interior of the air cylinder 4 is divided into a third oil chamber 403 and an air chamber 401 by a floating piston 7, with the third oil chamber 403 being close to the adjusting cylinder 3.

[0037] Both the compression damping regulating valve 8 and the rebound damping regulating valve 9 are installed on the regulating cylinder 3. The compression damping regulating valve 8 is located at the main oil circuit 301 and is used to regulate the oil flow from the second oil chamber 1602 to the third oil chamber 403. The rebound damping regulating valve 9 is located at the side oil circuit 302 and is used to regulate the oil flow from the oil gap 102 to the third oil chamber 403.

[0038] refer to Figure 4 The compression damping regulating valve 8 and the rebound damping regulating valve 9 each include a valve seat 891, a forward-flow elastic valve plate 892, a reverse-flow annular valve plate 893, a central pressure block 894, a reverse-flow spring 895, a damping regulating tube 896, a valve sleeve 897, a valve needle 898, and a knob 899. The valve seat 891 of the compression damping regulating valve 8 is fixedly installed at the main oil passage 301 of the regulating cylinder 3, and the valve seat 891 of the rebound damping regulating valve 9 is fixedly installed at the side oil passage 302 of the regulating cylinder 3. In each damping regulating valve:

[0039] The valve seat 891 is provided with a forward flow channel 8911 and a reverse flow channel 8912. The forward flow elastic valve plate 892 and the reverse flow annular valve plate 893 are respectively disposed at both ends of the valve seat 891, and the reverse flow annular valve plate 893 is disposed at the end closer to the oil passage. The forward flow elastic valve plate 892 can fit against the corresponding end face of the valve seat 891 under the limiting of the central pressure block 894 and only close the forward flow channel 8911. The reverse flow annular valve plate 893 can fit against the corresponding end face of the valve seat 891 under the elastic force of the reverse flow spring 895 and only close the reverse flow channel 8912.

[0040] The damping adjustment tube 896 is axially inserted through the valve seat 891. A valve sleeve 897 is provided next to the damping adjustment tube 896. A valve needle 898 is provided inside the valve sleeve 897. The middle part of the valve needle 898 and the valve sleeve 897 are threaded together. The tip of the valve needle 898 is located inside the damping adjustment tube 896. An oil passage hole 8971 is provided on the side of the valve sleeve 897 near the tip of the valve needle 898. The oil passage hole 8971 communicates with the damping adjustment tube 896. A knob 899 is fixedly connected to the end of the valve needle 898. The depth of the tip of the valve needle 898 in the damping adjustment tube 896 can be adjusted by rotating the knob 899, thereby adjusting the oil flow of the damping adjustment tube 896.

[0041] The working principle of the above-mentioned double-valve cylindrical shock absorber is as follows:

[0042] For reference Figure 3 and Figure 4 When the solid piston 6 compresses downwards, the damping oil in the second oil chamber 1602 first passes through the main oil passage 301, then through the compression damping regulating valve 8, and enters the third oil chamber 403. The damping oil in the third oil chamber 403 first passes through the rebound damping regulating valve 9, then through the side oil passage 302, and enters the oil passage 102, finally entering the first oil chamber 1601 to form the entire compression circuit. When the oil passes through the compression damping regulating valve 8 according to the above circuit, it is in the forward flow. A portion of the damping oil enters its forward flow channel 8911 and pushes open the forward flow elastic valve plate 892. That is, the forward flow elastic valve plate 892 will undergo elastic deformation under the oil pressure impact, and the outer edge will slightly lift up to allow the damping oil to pass through, generating a certain resistance while ensuring the minimum flow of the compression circuit. The remaining damping oil will be diverted into the damping regulating pipe 896 of the compression damping regulating valve 8. The oil flow rate is adjusted by valve needle 898, thereby adjusting the damping of the compression circuit. When the damping oil passes from the third oil chamber 403 through the rebound damping regulating valve 9, it flows in reverse. The forward flow channel 8911 of the rebound damping regulating valve 9 remains closed, and the damping oil enters its reverse flow channel 8912 to open the reverse flow annular valve plate 893. Since it only needs to overcome the elastic force of the reverse flow spring 895, the resistance at the reverse flow channel 8912 is much smaller than the resistance formed by valve needle 898 at the damping regulating pipe 896. Therefore, most of the damping oil will pass through the reverse flow channel 8912 during reverse flow. The position of valve needle 898 of the rebound damping regulating valve 9 will not affect the resistance during reverse flow too much and can be ignored. This makes the damping adjustment of the entire compression circuit mainly rely on the compression damping regulating valve 8, making the adjustment of the shock absorber's compression damping more precise and reliable.

[0043] When the solid piston 6 rebounds upwards, the damping oil in the first oil chamber 1601 first passes through the oil passage 102 and the side oil passage 302, then through the rebound damping regulating valve 9 and enters the third oil chamber 403. The damping oil in the third oil chamber 403 first passes through the compression damping regulating valve 8, then through the main oil passage 301 and enters the second oil chamber 1602, thus forming the entire rebound circuit. When the rebound damping regulating valve 9 passes through the above circuit, it is a positive flow. A portion of the damping oil enters its positive flow channel 8911 and pushes open the positive flow elastic valve plate 892. That is, the positive flow elastic valve plate 892 will undergo elastic deformation under the oil pressure impact, and the outer edge will slightly lift up to allow the damping oil to pass through, generating a certain resistance while ensuring the minimum flow of the rebound circuit. The remaining damping oil will be diverted into the damping regulating pipe 896 of the rebound damping regulating valve 9, and then... The valve needle 898 is used to adjust the oil flow rate, thereby adjusting the damping of the rebound circuit. When the damping oil passes through the compression damping regulating valve 8 from the third oil chamber 403, it flows in reverse. The forward flow channel 8911 of the compression damping regulating valve 8 remains closed, and the damping oil enters its reverse flow channel 8912 to open the reverse flow annular valve plate 893. Since it only needs to overcome the elastic force of the reverse flow spring 895, the resistance at the reverse flow channel 8912 is much smaller than the resistance formed by the valve needle 898 at the damping regulating pipe 896. Therefore, most of the damping oil will pass through the reverse flow channel 8912 during reverse flow. The position of the valve needle 898 of the compression damping regulating valve 8 will not affect the resistance during reverse flow too much and can be ignored. This makes the damping adjustment of the entire rebound circuit mainly rely on the rebound damping regulating valve 9, making the adjustment of the shock absorber's rebound damping more precise and reliable.

[0044] refer to Figure 1 and Figure 2 and Figure 6 The aforementioned double-valve cylindrical shock absorber also includes an adjusting ring 10, a separating collar 11, a limiting ring 12, an auxiliary spring 13, and a shock-absorbing spring 14.

[0045] The adjusting ring 10 and the separating sleeve 11 are both fitted onto the outer oil cylinder 2, with the separating sleeve 11 positioned above the adjusting ring 10. The adjusting ring 10 and the outer oil cylinder 2 are threaded together, and the separating sleeve 11 can move along the direction of the outer oil cylinder 2. The limiting ring 12 is fixedly connected to the end of the piston rod 5. The auxiliary spring 13 is positioned between the adjusting ring 10 and the separating sleeve 11, and the shock-absorbing spring 14 is positioned between the separating sleeve 11 and the limiting ring 12. The pitch of the auxiliary spring 13 is smaller than that of the shock-absorbing spring 14. The auxiliary spring 13 allows the compression stroke of the shock absorber to be longer, thus absorbing more impact energy.

[0046] In this embodiment, the dual-valve straight-tube shock absorber has its inner oil cylinder 1, outer oil cylinder 2, adjusting cylinder 3, and air cylinder 4 arranged coaxially. The coaxial connection between the oil cylinder and air cylinder 4 is achieved through the adjusting cylinder 3, resulting in a more reliable connection, stronger overall integrity, better aesthetics, and less space occupation. Furthermore, the resulting compression and rebound circuits are more unobstructed. With the solid piston 6, the damping oil can switch between the compression and rebound circuits more quickly, reducing damping hysteresis, increasing the response frequency, and making the shock absorber more responsive. After being impacted, it can quickly return to its original state, improving the vehicle's driving stability.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Based on the present utility model and the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cylindrical shock absorber with dual valves, characterized in that: It includes an inner oil cylinder (1), an outer oil cylinder (2), an adjusting cylinder (3), an air cylinder (4), a piston rod (5), a solid piston (6), a floating piston (7), a compression damping adjusting valve (8), and a rebound damping adjusting valve (9); The inner oil cylinder (1) is located inside the outer oil cylinder (2), and the gap between the inner oil cylinder (1) and the outer oil cylinder (2) forms an oil passage gap (102). The end of the oil passage gap (102) away from the regulating cylinder (3) is connected to the interior of the inner oil cylinder (1). The inner oil cylinder (1) and the outer oil cylinder (2) are fixedly connected to one end of the regulating cylinder (3), and the air cylinder (4) is fixedly connected to the other end of the regulating cylinder (3). The inner oil cylinder (1), the outer oil cylinder (2), the regulating cylinder (3) and the air cylinder (4) are coaxially arranged. The regulating cylinder (3) is divided into a main oil passage (301) and a side oil passage (302). One end of the main oil passage (301) is connected to the inside of the inner oil cylinder (1), and one end of the side oil passage (302) is connected to the oil passage gap (102). The other end of the main oil passage (301) and the other end of the side oil passage (302) are connected to the inside of the air cylinder (4). The interior of the inner oil cylinder (1) is divided into a first oil chamber (1601) and a second oil chamber (1602) by a solid piston (6) on the piston rod (5), with the second oil chamber (1602) being close to the regulating cylinder (3); the interior of the air cylinder (4) is divided into a third oil chamber (403) and an air chamber (401) by a floating piston (7), with the third oil chamber (403) being close to the regulating cylinder (3); The compression damping regulating valve (8) and the rebound damping regulating valve (9) are both installed on the regulating cylinder (3). The compression damping regulating valve (8) is located in the main oil circuit (301) and is used to regulate the oil flow from the second oil chamber (1602) to the third oil chamber (403). The rebound damping regulating valve (9) is located in the side oil circuit (302) and is used to regulate the oil flow from the oil gap (102) to the third oil chamber (403).

2. A cylindrical shock absorber with dual valves according to claim 1, characterized in that: The compression damping regulating valve (8) and the rebound damping regulating valve (9) each include a valve seat (891), a forward-flow elastic valve plate (892), a reverse-flow annular valve plate (893), a central pressure block (894), a reverse-flow spring (895), a damping regulating tube (896), a valve sleeve (897), a valve needle (898), and a knob (899). The valve seat (891) of the compression damping regulating valve (8) is fixedly installed at the main oil passage (301) of the regulating cylinder (3), and the valve seat (891) of the rebound damping regulating valve (9) is fixedly installed at the side oil passage (302) of the regulating cylinder (3). In each damping regulating valve: The valve seat (891) is provided with a forward flow channel (8911) and a reverse flow channel (8912). The forward flow elastic valve plate (892) and the reverse flow annular valve plate (893) are respectively located at both ends of the valve seat (891), and the reverse flow annular valve plate (893) is located at the end closer to the oil passage. The forward flow elastic valve plate (892) can fit against the corresponding end face of the valve seat (891) under the limiting of the central pressure block (894) and only close the forward flow channel (8911). The reverse flow annular valve plate (893) can fit against the corresponding end face of the valve seat (891) under the elastic force of the reverse flow spring (895) and only close the reverse flow channel (8912). The damping adjustment tube (896) is axially inserted through the valve seat (891). A valve sleeve (897) is provided next to the damping adjustment tube (896). A valve needle (898) is provided inside the valve sleeve (897). The middle part of the valve needle (898) and the valve sleeve (897) are threaded together. The tip of the valve needle (898) is located inside the damping adjustment tube (896). An oil passage hole (8971) is provided on the side of the valve sleeve (897) near the tip of the valve needle (898). The oil passage hole (8971) communicates with the damping adjustment tube (896). A knob (899) is fixedly connected to the end of the valve needle (898).

3. A double-valve cylindrical shock absorber according to claim 1 or 2, characterized in that: It also includes an adjusting ring (10), a separating collar (11), a limiting ring (12), an auxiliary spring (13), and a shock-absorbing spring (14); The adjusting ring (10) and the separating ring (11) are both fitted onto the outer oil cylinder (2). The separating ring (11) is located above the adjusting ring (10). The adjusting ring (10) and the outer oil cylinder (2) are threaded together. The limiting ring (12) is fixedly connected to the end of the piston rod (5). The auxiliary spring (13) is located between the adjusting ring (10) and the separating ring (11). The damping spring (14) is located between the separating ring (11) and the limiting ring (12). The pitch of the auxiliary spring (13) is smaller than the pitch of the damping spring (14).

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