Double-spring shock absorption structure

Abstract

The utility model relates to a double-spring shock-proof structure which is applied to absorbing impact force generated by a carrier system. The structure comprises an outer tube with an upper sleeve seat, an axially extending mounting space is limited in the outer tube, and a mandrel capable of axially penetrating out of the upper sleeve seat is arranged in the outer tube. A spring set which can be selectively pressed by the mandrel is arranged in the outer pipe, the spring set comprises a main spring piece and an auxiliary spring piece which are arranged at the upper end and the lower end of the outer pipe respectively, the elastic coefficient of the auxiliary spring piece is larger than that of the main spring piece, and the auxiliary spring piece is short. The main spring piece and the auxiliary spring piece are in butt joint through a non-rigid connecting structure, so that the structure can allow trace relative displacement and angular deviation, friction and loss caused by non-axial loads are effectively reduced, and the shock-proof stability and durability are improved.

Description

Technical Field

[0001] This utility model relates to a double-spring shock absorption structure, which is mainly applied in the field of shock absorption technology for bicycles and electric vehicles. Background Technology

[0002] Shock absorbers are components primarily used to absorb vibrations. They are widely used in various vehicles, machinery, and other applications where vibrations occur. Common shock absorber structures include springs, hydraulic components, and rubber components, designed to handle different vibration frequencies and amplitudes. Taking bicycles as an example, they have become widely used in recent years as a means of transportation, leisure, and sports. Due to varying road conditions and rider weight, the load on the bicycle varies, resulting in vibrations of different frequencies and amplitudes. To protect the bicycle components and ensure rider comfort, shock absorbers are typically installed on the front fork, rear fork, frame, or seat post for cushioning.

[0003] Existing shock-absorbing saddle assemblies consist of a seat mounted on a core at the top of an outer tube. A spindle, supported by a spring, is embedded within the outer tube. Two opposing connecting rods are located between the front and rear ends of the seat core and the outer tube. One of these connecting rods uses a roller to abut the top of the spindle. When the saddle is subjected to downward force, the connecting rod is pressed, indirectly pressing down on the spindle. This, in turn, causes the spindle to press against the spring, thus generating a shock-absorbing effect. However, existing shock absorbers typically use a single spring to provide cushioning. Since various springs usually have only a single spring constant, existing shock absorbers have a limited range of applications, failing to adapt to different road conditions or riding loads, and offering no immediate support in case of spring fatigue.

[0004] In other words, the shock absorption structure of existing bicycle saddle sets is not perfect in design and cannot meet the needs of different shock absorption ranges and emergency support when elasticity is exhausted. As a result, there are problems with smooth and unstable shock absorption. When an unsuitable shock absorber is encountered, it is necessary to replace it with a different suitable shock absorber, which causes inconvenience in use and increases the cost of use. Therefore, further improvement is needed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a double-spring shock absorption structure that can meet a wide range of loads and can be used to absorb vibrations of different frequencies and amplitudes to reduce replacement or spare parts costs. It can also exhibit a smooth and effective shock absorption response, thereby improving its shock absorption stability and impact absorption capacity. At the same time, it can simplify the overall parts and structure, making it easier to assemble and improving structural strength, thus overcoming the shortcomings of the prior art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a double-spring shock absorption structure, used to absorb the impact force generated by a carrier system, comprising: an outer tube and a spring assembly; the outer tube has an upper sleeve and a lower sleeve, and defines an axially extending installation space, and the installation space of the outer tube has a mandrel axially extending out of the upper sleeve; the spring assembly is disposed in the installation space of the outer tube and can be selectively pressed by the mandrel; the spring assembly includes at least: a main spring member, a secondary spring member, and a non-rigid connection structure; the main spring member is disposed in the installation space of the outer tube near the upper sleeve and has a first elastic coefficient; the secondary spring member is disposed in the installation space of the outer tube near the lower sleeve and has a second elastic coefficient greater than the first elastic coefficient; the non-rigid connection structure is disposed at the joint between the main spring member and the secondary spring member to allow limited relative displacement and angular deviation between the main spring member and the secondary spring member, and to reduce frictional loss caused by non-axial loads.

[0007] Preferably, the axial length of the secondary spring is less than the axial length of the primary spring.

[0008] Preferably, the main spring is a compression spring made of round wire rod, while the secondary spring is a compression spring made of rectangular wire rod.

[0009] Preferably, the spring assembly further includes a buffer member with an axial through hole, the buffer member being disposed between the main spring member and the auxiliary spring member, for absorbing the nonlinear damping generated by the spring assembly during compression.

[0010] Preferably, the buffer is a conical rubber block.

[0011] Preferably, a shaft is inserted into the through hole of the buffer member, the shaft is disposed on a first connector, and the first connector is connected to the bottom end of the main spring member.

[0012] Preferably, the top of the secondary spring is connected to a second connector, and the mating surfaces of the second connector and the buffer are respectively formed with a second flat contact surface and a first flat contact surface that fit relatively closely, so that the overall structure can tolerate small axial and radial deviations.

[0013] Preferably, the upper end of the main spring member is provided with an upper bushing, the upper bushing includes a limiting groove and a first protruding guide post. The limiting groove is used for the mandrel to abut and be positioned, and the first protruding guide post is inserted into the upper part of the main spring member to limit its displacement and maintain its axial stability.

[0014] Preferably, the lower end of the auxiliary spring is provided with a lower bushing, which includes a second protruding guide post and a limiting block. The second protruding guide post passes through the lower internal section of the auxiliary spring, and the limiting block abuts against a limiting groove opposite to the lower sleeve seat to limit its displacement and maintain its axial stability.

[0015] Preferably, the dual-spring shock absorption structure can be a single-pad shock absorption seat tube, with a brake member pivotally mounted at the top of the upper sleeve of the outer tube for mounting a pad, and the brake member can press the spindle.

[0016] The beneficial effects of this utility model are as follows: Through the aforementioned technical means, this invention utilizes the design of the main spring and the auxiliary spring, which are sequentially connected in the spring assembly with elastic coefficients ranging from small to large, to withstand impacts of different ranges and meet the needs of different loads. This makes the vibration damping operation smoother and more stable. At the same time, by utilizing the characteristics of this non-rigid connection structure, displacement deviation can be effectively adjusted, improper contact wear can be avoided, and friction noise can be prevented. Furthermore, it provides better support, greatly improving its practicality, effectively increasing its added value, and enhancing its economic benefits.

[0017] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the dual-spring shock absorption structure of this creation.

[0019] Figure 2 This is a three-dimensional exploded view of the dual-spring shock absorption structure of this creation.

[0020] Figure 3 This is a side view cross-sectional diagram of the dual-spring shock absorption structure of this creation.

[0021] Figure 4 This is a schematic diagram of the first action of the dual-spring shock absorption structure in actual use.

[0022] Figure 5 This is a schematic diagram of the second action of the dual-spring shock absorption structure in actual use.

[0023] Figure 6 This is a schematic diagram of the third action of the dual-spring shock absorption structure in actual use.

[0024] Figure 7 This is a schematic diagram of the fourth action of the dual-spring shock absorption structure in actual use. Detailed Implementation

[0025] like Figure 1 , Figure 2 and Figure 3As shown, the dual-spring shock absorption structure of this invention, taking the seatpost of a bicycle saddle as an example, consists of an outer tube 10 with an axially extending installation space and a spring assembly 20. The lower end and upper end of the outer tube 10 are respectively provided with a lower sleeve 11 and an upper sleeve 12. The spring assembly 20 is provided between the upper sleeve 12 and the lower sleeve 11. A spindle 15 that can selectively press the spring assembly 20 is slidably passed through the upper sleeve 12. A brake 16 that can selectively press the spindle 15 is pivotally provided at the top of the upper sleeve 12, so that when the spindle 15 is pressed down by the brake 16, the spring assembly 20 can be compressed to produce a buffering effect. The brake 16 can be a seat head for mounting the saddle.

[0026] The distinctive feature of this invention is that the spring assembly 20 is composed of at least one main spring member 21 and a secondary spring member 25. The main spring member 21 is located above the spindle 15, while the secondary spring member 25 is located below the spindle 15. The main spring member 21 has a first elastic coefficient, and the secondary spring member 25 has a second elastic coefficient, wherein the second elastic coefficient is greater than the first elastic coefficient, and the axial length of the secondary spring member 25 is shorter than that of the main spring member 21. The main spring member 21 is a compression spring made of round wire rod, while the secondary spring member 25 is a compression spring made of rectangular wire rod. This allows the main spring member 21 to be used to absorb smaller impact forces, while the secondary spring member 25 can be used to absorb larger impact forces. Furthermore, the connection between the main spring member 21 and the secondary spring member 25 is a non-rigid connection structure.

[0027] Further detailed composition of this work, such as Figure 2 and Figure 3As shown, an upper bushing 22 is provided between the main spring member 21 and the spindle 15 of the spring assembly 20. The top surface of the upper bushing 22 has a limiting groove 221 for the spindle 15 to abut against, and the bottom surface of the upper bushing 22 has a first protruding guide post 222 for passing through the upper part of the main spring member 21. The bottom end of the main spring member 21 has a first connecting member 23, and the top surface of the first connecting member 23 has a first protruding post 231 for passing through the lower part of the main spring member 21, so that the main spring member 21 can be smoothly compressed between the spindle 15 and the first connecting member 23. Furthermore, the auxiliary spring member 25 and the lower sleeve 11 of the spring assembly 20 A lower bushing 26 is provided, the top surface of which has a second protruding guide post 261 for inserting into the lower section of the secondary spring member 25, and the bottom surface of which has a limiting block 262 for the lower sleeve seat 11 to abut against. The lower sleeve seat 11 has a corresponding limiting groove 111. The top of the secondary spring member 25 has a second connecting member 27, and the bottom surface of the second connecting member 27 has a second protruding post 271 for inserting into the upper section of the secondary spring member 25, so that the secondary spring member 25 can be smoothly compressed between the second connecting member 27 and the lower bushing 26, and the first connecting member 23 and the second connecting member 27 are non-rigidly connected.

[0028] According to some embodiments, a buffer member 28 is provided between the main spring member 21 and the auxiliary spring member 25. The buffer member 28 is made of rubber and is a cone-shaped object with a smaller top and a larger bottom. The buffer member 28 has a through hole 281 at its center. The first connecting member 23 has a post 232 inserted into the through hole 281 of the buffer member 28, so that the rubber buffer member 28 has a torsional deformation, which can absorb the nonlinear damping of the spring assembly 20 to improve the axiality of excessive force deviation. Furthermore, the opposing surfaces of the buffer member 28 and the second connecting member 27 respectively form a first flat contact surface 282 and a second flat contact surface 272, so that the buffer member 28 and the auxiliary spring member 25 are non-rigidly connected, so that the auxiliary spring member 25 and the buffer member 28 can provide permissible misalignment (e.g., Figure 7 As shown), the spring assembly 20 has an automatic correction function to reduce improper friction between the main spring 21, the auxiliary spring 25 and the inner wall of the outer tube 10, thereby forming a simple and smooth double-spring shock absorption structure.

[0029] This innovative double-spring shock absorption structure, during actual operation, such as Figure 3 and Figure 4As shown, when the dual-spring shock absorber structure is subjected to a small impact force, causing the brake member 16 to generate a small sway, the brake member 16 can press against the spindle 15 to actuate the spring assembly 20, causing the main spring member 21 of the spring assembly 20 to be partially compressed downwards without compressing the buffer member 28 and the auxiliary spring member 25, so that the main spring member 21 can withstand the amplitude of the initial to middle stroke and has a more sensitive buffering effect.

[0030] When the dual-spring shock absorber structure is subjected to a large impact force, such as Figure 5 As shown, when the brake element 16 generates a large sway, it can press against the spindle 15 and move downwards, thus actuating the spring assembly 20. When the main spring element 21 of the spring assembly 20 is compressed to near full compression, it can further press the buffer element 28, but has not yet pressed the secondary spring element 25. This allows the buffer element 28 to withstand the amplitude of the stroke from the middle to the end, thus providing a supporting buffering effect to absorb the large amplitude impact of the main spring element 21 at the end of the middle section. It can also overcome nonlinear damping by utilizing the non-rigid connection between the buffer element 28 and the secondary spring element 25 (e.g., Figure 7 As shown, it can tolerate misalignment and avoid direct friction between the main spring 21, the auxiliary spring 25 and the inner wall of the outer tube 10, thereby suppressing noise and wear.

[0031] When encountering a greater impact force, such as Figure 6 As shown, the brake 16 presses against the spindle 15 and moves downward to actuate the spring assembly 20. When the main spring 21 of the spring assembly 20 is fully compressed and the buffer 28 is also compressed to a certain extent, the auxiliary spring 25 begins to act. The auxiliary spring 25 is used to withstand the impact amplitude of the final stroke, providing enhanced support force at the end of the stroke to prevent impact at the bottom stroke and to meet the support requirements of high-intensity impacts, such as potholes or steps.

[0032] As explained above, the dual-spring shock absorber structure of this invention utilizes the design of the main spring 21, the buffer 28, and the auxiliary spring 25, which are sequentially connected in the spring assembly 20 with elastic coefficients ranging from small to large. This allows it to withstand impacts of different ranges and meet the needs of different loads, making the shock absorption operation smoother and more stable. At the same time, by utilizing its non-rigid connection characteristics, it can effectively adjust displacement deviations, avoid improper contact wear, and prevent friction noise. Furthermore, the buffer 28 can further absorb nonlinear impacts to overcome the phenomenon of force transmission deviating from the axis, providing better support and greatly improving its practicality.

Claims

1. A double-spring shock-absorbing structure, used to absorb the impact force generated by a carrier system, comprising: an outer tube and a spring assembly; characterized in that: The outer tube has an upper sleeve and a lower sleeve, defining an axially extending installation space. A mandrel axially extends out of the upper sleeve within the installation space of the outer tube. A spring assembly is disposed within the installation space of the outer tube and can be selectively pressed by the mandrel. The spring assembly includes at least: a main spring member, a secondary spring member, and a non-rigid connection structure. The main spring member is disposed in the installation space of the outer tube near the upper sleeve and has a first elastic coefficient. The secondary spring member is disposed in the installation space of the outer tube near the lower sleeve and has a second elastic coefficient greater than the first elastic coefficient. The non-rigid connection structure is disposed at the mating point of the main spring member and the secondary spring member to allow limited relative displacement and angular deviation between the main spring member and the secondary spring member, and to mitigate frictional losses caused by non-axial loads.

2. The dual spring suspension structure of claim 1, wherein: The axial length of the secondary spring is less than the axial length of the primary spring.

3. The dual spring suspension structure of claim 1, wherein: The main spring component is a compression spring made of round wire rod, while the secondary spring component is a compression spring made of rectangular wire rod.

4. The dual spring suspension structure of claim 1, wherein: The spring assembly further includes a buffer member with an axial through hole, which is disposed between the main spring member and the auxiliary spring member to absorb the nonlinear damping generated by the spring assembly during compression.

5. The dual spring suspension structure of claim 4, wherein: The buffer is a conical rubber block.

6. The dual spring suspension structure of claim 4, wherein: A shaft is inserted into the through hole of the buffer member, and the shaft is mounted on a first connector, which is connected to the bottom end of the main spring member.

7. The dual spring suspension structure of claim 4, wherein: The top of the secondary spring is connected to a second connector. The mating surfaces of the second connector and the buffer are respectively formed with a second flat contact surface and a first flat contact surface that fit together, so that the overall structure can tolerate small axial and radial deviations.

8. Double-spring suspension according to any one of claims 1 to 7, characterized in that: The upper end of the main spring component is provided with an upper bushing, which includes a limiting groove and a first convex guide post. The limiting groove is used for the spindle to abut and be positioned, and the first convex guide post is inserted into the upper part of the main spring component to limit its displacement and maintain its axial stability.

9. Double-spring shock absorbing structure according to any one of claims 1 to 7, characterized in that: The lower end of the auxiliary spring is provided with a lower bushing. The lower bushing includes a second convex guide post and a limiting block. The second convex guide post passes through the lower internal section of the auxiliary spring, and the limiting block abuts against a limiting groove opposite to the lower bushing seat to limit its displacement and maintain its axial stability.

10. The dual spring suspension structure of any one of claims 1-7, wherein: The dual-spring shock absorption structure can be a single-pad shock absorption seat tube, with a brake element pivotally mounted at the top of the upper sleeve of the outer tube for mounting a pad, and the brake element can press the spindle.

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