Fatigue resistant flat wire spring

Abstract

The utility model discloses a kind of flat wire springs of fatigue resistance, belong to spring technical field, it includes spring body as elastic element, upper and lower ends are respectively installed with upper guide sleeve and lower guide sleeve by the way of interference fit, for guiding and limiting the telescopic movement track of spring body, guide pillar is set in the inside of spring body, play to enhance structural stability and guiding effect, specifically, spring body has adopted the structure design of rectangular cross section, compared with traditional round cross section spring, this design significantly improves the carrying capacity and anti-lateral deformation ability of spring body, simultaneously, rectangular cross section structure can realize higher space utilization in same installation space, to effectively increase the energy storage density of spring, so that it can store more elastic potential energy in unit volume, the device solves the problem that current traditional round cross section spring is easy to fatigue and easy to lose stability.

Description

Technical Field

[0001] This utility model belongs to the field of spring technology, specifically relating to a fatigue-resistant flat wire spring. Background Technology

[0002] A spring is a mechanical part that works by utilizing elasticity and is widely used in various equipment for cushioning, shock absorption, energy storage, and motion control. Traditional springs, such as helical springs, typically have a circular cross-section wire. While the manufacturing process for this type of circular cross-section spring is mature and its application is widespread, it has some inherent drawbacks under certain specific operating conditions.

[0003] However, when traditional circular cross-section springs are subjected to loads, the stress distribution of the material is relatively concentrated on the outer side of the wire, making them prone to fatigue cracks under long-term alternating loads, resulting in a limited fatigue life. Secondly, during compression or extension, if subjected to lateral forces or eccentric loading, circular cross-section springs are prone to bending deformation (instability) or coil buckling, which not only affects their linear operating characteristics but may also further reduce their lifespan due to inter-coil friction and wear. This phenomenon is particularly problematic in applications requiring high precision, long lifespan, and stability, such as precision instruments, high-end valves, and long-life actuators. Therefore, it remains a pressing issue for researchers in this field. Utility Model Content

[0004] The purpose of this invention is to provide a fatigue-resistant flat wire spring to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a fatigue-resistant flat wire spring, comprising a spring body as an elastic element, with an upper guide sleeve and a lower guide sleeve respectively installed at its upper and lower ends by an interference fit, used to guide and limit the extension and retraction trajectory of the spring body. A guide post is provided through the inside of the spring body to enhance structural stability and guide. Specifically, the spring body adopts a rectangular cross-section design. Compared with the traditional circular cross-section spring, this design significantly improves the load-bearing capacity and resistance to lateral deformation of the spring body. At the same time, the rectangular cross-section structure can achieve higher space utilization in the same installation space, thereby effectively increasing the energy storage density of the spring and enabling it to store more elastic potential energy per unit volume.

[0006] This invention further explains that all edges of the spring body are chamfered, which not only effectively eliminates internal stress generated during processing, but also significantly improves the overall fatigue resistance of the spring, reduces the contact area of ​​each coil in the spring body, and extends its service life. The spring body adopts a rectangular cross-section structure, with its short side parallel to the central axis of the spring body. This layout allows the spring to store and release energy more efficiently when subjected to axial compressive loads. In addition, this structural design can also ensure smooth movement between each coil during compression and rebound, avoiding mutual interference or friction, thereby ensuring the stability and reliability of the spring operation.

[0007] The present invention further explains that the upper guide sleeve is composed of an ear and a cylindrical part, wherein the diameter of the ear is larger than the diameter of the cylindrical part, and the diameter of the ear is equal to the diameter of the spring body. Thus, the ear provides an effective axial positioning function for the spring body, and allows the outer sides of both the upper guide sleeve and the spring body to contact the external structure.

[0008] This utility model further explains that the upper guide sleeve has an upward-facing mounting hole at the top center, and a through central hole is machined inside the cylinder. The diameter of the central hole is smaller than the diameter of the mounting hole. This structure helps to achieve precise centering and stable support during assembly, ensuring the smooth operation of the entire mechanism. The upper guide sleeve and the lower guide sleeve have the same structure.

[0009] This utility model further illustrates that the outer part of the cylinder is interference-fitted with the spring body, and the ear provides axial restraint for the spring body.

[0010] This utility model further explains that the guide post is a hollow cylindrical structure with smooth inner and outer walls. The upper and lower ends of the guide post are respectively press-fitted with the upper guide sleeve and the lower guide sleeve. The top end of the guide post passes through the central hole to the inside of the cylinder. Both ends of the guide post are provided with a locking structure. The locking structure is pressed into the cylinder by a press, so that the guide post is connected to the upper guide sleeve or the lower guide sleeve. After the spring body applies pressure to the ear, the cylinder and the locking structure are pulled tight and fit together to achieve axial positioning.

[0011] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: By setting a spring body with a rectangular cross section, this utility model can improve the fatigue strength and load-bearing capacity of the spring and improve the space utilization of the spring; by setting upper and lower guide sleeves and guide posts to form a sturdy frame, it can effectively prevent the spring body from lateral bending and instability; by setting interference fits between various components, the structure is compact and the size is small. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall assembly structure of this utility model; Figure 2 This is a cross-sectional schematic diagram of the present invention; Figure 3 This is a schematic diagram of the assembly structure of the upper and lower guide sleeves and guide posts of this utility model; Figure 4 This is a cross-sectional view of the upper and lower guide sleeves and guide pillars assembled in this utility model; In the diagram: 1. Spring body; 2. Upper guide sleeve; 3. Lower guide sleeve; 4. Guide post; 5. Ear; 6. Cylinder; 7. Mounting hole; 8. Center hole; 9. Clamping surface structure. Detailed Implementation

[0013] The following detailed, non-limiting description of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0014] Please see Figure 1-4 This utility model provides a technical solution: a fatigue-resistant flat wire spring. The device includes a spring body 1 as an elastic element, with an upper guide sleeve 2 and a lower guide sleeve 3 respectively installed at its upper and lower ends by interference fit, which are used to guide and limit the extension and retraction trajectory of the spring body 1. A guide post 4 is provided through the inside of the spring body 1 to enhance structural stability and guide. Specifically, the spring body 1 adopts a rectangular cross-section structure design. Compared with the traditional circular cross-section spring, this design significantly improves the load-bearing capacity and resistance to lateral deformation of the spring body 1. At the same time, the rectangular cross-section structure can achieve higher space utilization in the same installation space, thereby effectively increasing the energy storage density of the spring and enabling it to store more elastic potential energy per unit volume.

[0015] All edges of the spring body 1 are chamfered, which not only effectively eliminates the internal stress generated during processing, but also significantly improves the overall fatigue resistance of the spring, reduces the contact area of ​​each coil of the spring body 1, and extends its service life. The spring body 1 adopts a rectangular cross-section structure, with its short side parallel to the central axis of the spring body 1. This layout allows the spring to store and release energy more efficiently when subjected to axial compressive load. In addition, this structural design can also ensure smooth movement between each coil of the spring body 1 during compression and rebound, avoiding mutual interference or friction, thereby ensuring the stability and reliability of the spring operation.

[0016] The upper guide sleeve 2 is composed of an ear 5 and a cylindrical part 6. The diameter of the ear 5 is larger than the diameter of the cylindrical part 6, and the diameter of the ear 5 is equal to the diameter of the spring body 1. Thus, the ear 5 provides an effective axial positioning function for the spring body 1, and allows the upper guide sleeve 2 and the outer side of the spring body 1 to contact the external structure.

[0017] The upper guide sleeve 2 has an upward-facing mounting hole 7 at the top center, and the cylinder 6 has a through central hole 8 machined inside. The diameter of the central hole 8 is smaller than the diameter of the mounting hole 7. This structure helps to achieve precise centering and stable support during assembly, ensuring the smooth operation of the entire mechanism.

[0018] The outer part of the cylinder 6 is press-fitted with the spring body 1, and the lug 5 provides axial restraint for the spring body 1; The guide post 4 is a hollow cylindrical structure with smooth inner and outer walls. The upper and lower ends of the guide post 4 are respectively press-fitted with the upper guide sleeve 2 and the lower guide sleeve 3. The top end of the guide post 4 passes through the central hole 8 to the inside of the cylindrical part 6. Both ends of the guide post 4 are provided with a retaining structure 9. The retaining structure 9 is pressed into the cylindrical part 6 by a press, so that the guide post 4 is connected to the upper guide sleeve 2 or the lower guide sleeve 3. After the spring body 1 applies pressure to the ear 5, the cylindrical part 6 and the retaining structure 9 are pulled tight and fitted together to achieve axial limiting. The upper guide sleeve 2 and the lower guide sleeve 3 have the same structure.

[0019] Working principle: When an external axial load is applied to the upper guide sleeve 2 and the lower guide sleeve 3, the force is transmitted to the spring body 1 through the upper guide sleeve 2 and the lower guide sleeve 3. The spring body 1 undergoes elastic deformation, producing compression displacement, and stores the externally applied force in the form of elastic potential energy. Then, when the external load is removed, the stored strain energy is released, driving the spring to return to its original shape and releasing the energy, thus completing one working cycle. The rectangular cross-section can improve space utilization and store more energy. The guide post 4, the upper guide sleeve 2, and the lower guide sleeve 3 form a stable frame, providing stable radial support for the spring body 1 and preventing lateral bending.

[0020] Assembly steps: During installation, first align one end of the guide post 4 with the center hole of the lower guide sleeve 3, and use a press to press the guide post 4 into the lower guide sleeve 3 until an interference fit is achieved. Then, insert the fixed sub-component into the inner cavity of the spring body 1, and continue to use the press to fully press the lower guide sleeve 3 into the bottom end of the spring body 1 until the spring end face is completely flush with the ear of the lower guide sleeve 3. Align the center hole 8 of the upper guide sleeve 2 with the free end of the guide post 4, and use a press to apply pressure to the upper guide sleeve 2, ensuring that the spring body 1 and the lower sub-component remain stable. Continue to apply pressure until the predetermined position is reached to form a firm interference fit. At the same time, the retaining structure 9 at both ends of the guide post 4 will provide an axial limit for the upper guide sleeve 2 and the lower guide sleeve 3.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model, 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, and therefore should not be construed as a limitation of this utility model.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fatigue resistant flat wire spring comprising a spring body (1), characterized in that: The upper guide sleeve (2) and the lower guide sleeve (3) are respectively installed at the upper and lower ends of the spring body (1) by interference fit. A guide post (4) is provided through the inside of the spring body (1). The spring body (1) adopts a rectangular cross-section structure design.

2. The fatigue-resistant flat wire spring according to claim 1, characterized in that: Each edge of the spring body (1) is chamfered, and the short side of the spring body (1) is parallel to its central axis.

3. The fatigue-resistant flat wire spring according to claim 2, characterized in that: The upper guide sleeve (2) is composed of an ear (5) and a cylindrical part (6). The diameter of the ear (5) is greater than the diameter of the cylindrical part (6), and the diameter of the ear (5) is equal to the diameter of the spring body (1).

4. A flat spring according to claim 3, characterized in that: The upper guide sleeve (2) has an upward-facing mounting hole (7) at the top center, and the cylindrical part (6) has a through central hole (8) inside. The diameter of the central hole (8) is smaller than the diameter of the mounting hole (7). The upper guide sleeve (2) and the lower guide sleeve (3) have the same structure.

5. A flat spring according to claim 4, characterized in that: The outer part of the cylindrical part (6) is press-fitted with the spring body (1), and the ear part (5) provides axial limit for the spring body (1).

6. A flat spring according to claim 5, characterized in that: The guide post (4) is a hollow cylindrical structure with smooth inner and outer walls. The upper and lower ends of the guide post (4) are respectively press-fitted with the upper guide sleeve (2) and the lower guide sleeve (3). The top end of the guide post (4) passes through the central hole (8) to the inside of the cylindrical part (6). Both ends of the guide post (4) are provided with a face structure (9). The face structure (9) is pressed into the cylindrical part (6) by a press, so that the guide post (4) is connected to the upper guide sleeve (2) or the lower guide sleeve (3). After the spring body (1) applies pressure to the ear (5), the cylindrical part (6) and the face structure (9) are pulled tight and fitted together to achieve axial positioning.

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