A tension spring structure

Abstract

The utility model discloses a kind of tension spring structure, including tension spring body, define the extension direction of tension spring body as first direction, along first direction, the tension spring body has first end and second end, the first end is bent and forms first connecting part, the second end is bent and forms second connecting part, the bending of first connecting part and second connecting part is equipped with arc transition structure, first connecting part is formed with at least three bending sections, second connecting part has close end, the tension spring body is spiral coil structure formed by spiral winding along first direction, the spiral coil structure includes several spring ring, the close end is stretched into in the spiral coil structure, and close end and the inner edge contact of at least one spring ring can make load more evenly distributed on entire tension spring, not concentrated in end or connecting place, can reduce local deformation, improve the overall stiffness and stability of tension spring.

Description

Technical Field

[0001] This utility model relates to the field of tension spring technology, and in particular to a tension spring structure. Background Technology

[0002] Tension springs are important elastic components in mechanical transmission and connections. They transmit force by generating elastic deformation through stretching. The performance of tension springs directly affects the stability and service life of the overall equipment. In the existing technology, the structure of tension springs is as follows: Figure 1 As shown, the spring body 1' has a first connecting part 2' and a second connecting part 3' formed by bending at both ends. However, the ends of the first connecting part 2' and the second connecting part 3' are mostly open structures, and their ends are suspended. When subjected to force, the load is concentrated in the first connecting part 2' and the second connecting part 3', which leads to stress concentration. After long-term use, cracks or even breakage are likely to occur. Therefore, it is necessary to improve it. Utility Model Content

[0003] The purpose of this utility model is to address the defects and shortcomings of the existing technology by providing a tension spring structure. The structure is simple and reasonable, and easy to operate. The tension spring body is a spiral coil structure formed by spiral winding along a first direction. The spiral coil structure includes several continuous spring coils. The second connecting part has a constricted end that extends into the spiral coil structure and contacts the inner edge of at least one spring coil. This allows the load to be distributed more evenly across the entire tension spring, rather than being concentrated at the end or connection point. This reduces local deformation and improves the overall stiffness and stability of the tension spring.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: The present invention discloses a tension spring structure, comprising a tension spring body, wherein the extension direction of the tension spring body is defined as a first direction, and the tension spring body has a first end and a second end along the first direction. The first end is bent to form a first connecting portion, and the second end is bent to form a second connecting portion. Both the first connecting portion and the second connecting portion have an arc transition structure at their bends. The first connecting portion has at least three bends, and the second connecting portion has a constricted end. The tension spring body is a spiral coil structure formed by spiral winding along the first direction. The spiral coil structure includes a plurality of spring coils, and the constricted end extends into the spiral coil structure and contacts the inner edge of at least one of the spring coils.

[0005] Furthermore, the first connecting portion and the second connecting portion are in the form of or substantially in the form of a hook and loop structure.

[0006] Furthermore, the first connecting part and the second connecting part are coaxially arranged along the center line of the tension spring body.

[0007] Furthermore, the first connecting part, the second connecting part, and the tension spring body are all made of martensitic or semi-austenitic stainless steel.

[0008] Furthermore, the constricted end is designed in an arc shape.

[0009] Furthermore, the number of spring coils that actually participate in elastic deformation in the helical coil structure is defined as the effective number of coils, which is 9.5 coils.

[0010] Furthermore, the surfaces of the first connecting part, the second connecting part, and the tension spring body are all smooth.

[0011] The beneficial effects of this utility model are as follows: The tension spring structure of this utility model includes a tension spring body, which has a first end and a second end arranged opposite to each other. The first end is bent to form a first connecting part, and the second end is bent to form a second connecting part. Both the first connecting part and the second connecting part have a rounded transition structure at the bend. The rounded structure can effectively reduce the local stress peak, delay the crack initiation, and make the tension spring more uniformly stressed. After bending, the first connecting part has at least three bending segments. Existing tension spring structures are usually simply bent and formed. The tension spring structures in the background art only have two bending segments and the bending arc is small. When under force, the stress is concentrated. However, in this embodiment, the first connecting part has three bending segments and the bending arc is larger, which can more effectively disperse the stress, improve the vibration resistance stability, reduce the reverse impact force generated during the conversion of the tension spring, and improve the service life of the tension spring and the reliability of the contact. The second connecting part has a constricted end. The tension spring body is a spiral coil structure formed by spiral winding along the first direction. The spiral coil structure includes several continuous spring coils. The constricted end extends into the spiral coil structure and contacts the inner edge of at least one of the spring coils. This allows the load to be distributed more evenly across the entire tension spring, rather than concentrated at the end or connection point. This reduces local deformation and improves the overall stiffness and stability of the tension spring. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a tension spring structure in the prior art; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 This is an enlarged structural diagram of the second connecting part.

[0013] Figures 1-3 middle: 1' Tension spring body; 2' First connecting part; 21' First segment; 22' Second segment; 3' Second connecting part; 1. Tension spring body; 11. Spring coil; 2. First connecting part; 21. First bending section; 22. Second bending section; 23. Third bending section; 3. Second connecting part; 31. Closing end. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] like Figures 2-3 The illustrated tension spring structure includes a tension spring body 1. The extension direction of the tension spring body 1 is defined as a first direction, which in this embodiment is the axial direction of the tension spring body 1. Along the first direction, the tension spring body 1 has a first end and a second end disposed opposite to each other. The first end is bent to form a first connecting portion 2, and the second end is bent to form a second connecting portion 3. Both the bends of the first connecting portion 2 and the second connecting portion 3 are provided with arc transition structures. The arc structures can effectively reduce local stress peaks, delay crack initiation, and make the tension spring more evenly stressed. After bending, the first connecting portion 2 forms at least three bent segments. Existing tension spring structures are usually simply bent into shape. (See reference...) Figure 1 In the prior art, the tension spring structure has only two bent sections in the first connecting part 2', namely the first section 21' and the second section 22'. The first section 21' and the second section 22' are connected sequentially with a small bending radius, resulting in stress concentration under load. In this embodiment, the first connecting part 2 has three bent sections, defined as the first bent section 21, the second bent section 22 and the third bent section 23. The first bent section 21, the second bent section 22 and the third bent section 23 are connected sequentially, and the bending radius of the first connecting part 2 is larger, which can more effectively disperse stress, improve vibration stability, reduce the reverse impact force generated during the conversion of tension spring use, and improve the service life of tension spring and the reliability of contact.

[0016] See Figures 2-3 The second connecting part 3 has a constricted end 31. The tension spring body 1 is a spiral coil structure formed by spiral winding along the first direction. The spiral coil structure includes a plurality of continuous spring coils 11. The constricted end 31 extends into the spiral coil structure and contacts the inner edge of at least one of the spring coils 11. This allows the load to be distributed more evenly across the entire tension spring, rather than being concentrated at the end or connection point. This reduces local deformation and improves the overall stiffness and stability of the tension spring.

[0017] Preferably, in this embodiment, refer to Figure 3 The constriction end 31 is designed in an arc shape to avoid stress concentration caused by sudden cut-off, so that the tension spring is subjected to more uniform force, reducing the risk of off-center load and extending the service life of the tension spring under high-frequency tension conditions.

[0018] Preferably, in this embodiment, refer to Figure 2 The first connecting part 2 and the second connecting part 3 are in the form of or approximately in the form of a hook and loop structure, which facilitates their cooperation with hooks and connectors.

[0019] Preferably, in this embodiment, refer to Figure 2 The first connecting part 2 and the second connecting part 3 are coaxially arranged along the center line of the tension spring body 1. The coaxial design ensures that the tension is transmitted along the center line of the tension spring, and the force is uniform. This can reduce the risk of local fatigue, reduce friction and wear, reduce off-center load, avoid lateral torque, and avoid abnormal friction between the first connecting part 2, the second connecting part 3 and the connecting parts caused by misalignment, thereby extending the service life of the tension spring.

[0020] Existing tension springs often exhibit sand holes in their fracture surfaces. The causes of these sand holes are primarily related to manufacturing processes and material defects. During the production of tension springs, if the metal material contains pores, inclusions, or casting defects, these defects may not be completely eliminated during subsequent processing, resulting in tiny voids or sand holes. Combined with high frequency of use, increasing mechanical wear and spring fatigue over the years, and the stress concentrated at these sand hole locations during field adjustments, the tension spring ultimately breaks.

[0021] Preferably, in this embodiment, to reduce sand holes, the first connecting part 2, the second connecting part 3, and the tension spring body 1 are all made of metal wire. The metal wire is made of martensitic or semi-austenitic stainless steel, which has few impurities, no weld joints, and excellent corrosion resistance, especially in chloride and weak acid environments. This invention, through cold working and heat treatment (such as precipitation hardening), gives the steel wire high tensile strength (up to 1500-2000 MPa or more) and suitable hardness; in addition, its high elasticity and fatigue resistance allow it to maintain its performance under repeated stress, effectively extending its service life; and it maintains stability even at high temperatures.

[0022] The tension spring of this invention is formed by automated molding, which results in high production efficiency, high precision, and good consistency.

[0023] The effective number of coils 11 actually involved in elastic deformation in the helical coil structure is defined as the number of coils. Existing tension springs typically have 8.5 effective coils. Preferably, in this embodiment, the effective number of coils is 9.5, and the total number of coils 11 in the helical coil structure is 9.5. In this embodiment, 1 coil refers to a complete helical unit formed by rotating the metal wire 360 ​​degrees around the center line of the tension spring body 1 along the helical trajectory, and 0.5 coils refers to a non-complete helical segment rotated 180 degrees. This invention increases the effective number of coils from 8.5 to 9.5 while maintaining the original elasticity. More coils mean that the load is distributed across more coils 11, effectively reducing stress concentration and improving the fatigue life and fatigue resistance of the tension spring.

[0024] Preferably, in this embodiment, the surfaces of the first connecting part 2, the second connecting part 3, and the tension spring body 1 are all smooth, which can effectively disperse stress, avoid stress concentration at sharp corners, eliminate sharp edges and reduce the risk of scratches, thereby improving the fatigue life and fracture resistance of the spring.

[0025] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A tension spring structure, comprising a tension spring body (1), characterized in that... The extension direction of the tension spring body (1) is defined as the first direction. Along the first direction, the tension spring body (1) has a first end and a second end. The first end is bent to form a first connecting part (2), and the second end is bent to form a second connecting part (3). Both the first connecting part (2) and the second connecting part (3) are provided with arc transition structures at their bends. The first connecting part (2) is formed with at least three bends. The second connecting part (3) has a closing end (31). The tension spring body (1) is a spiral coil structure formed by spiral winding along the first direction. The spiral coil structure includes several spring coils (11). The closing end (31) extends into the spiral coil structure and contacts the inner edge of at least one of the spring coils (11).

2. The tension spring structure according to claim 1, characterized in that: The first connecting part (2) and the second connecting part (3) are in the form of or approximately in the form of a hook and loop structure.

3. The tension spring structure according to claim 1, characterized in that: The first connecting part (2) and the second connecting part (3) are coaxially arranged along the center line of the tension spring body (1).

4. The tension spring structure according to claim 1, characterized in that: The first connecting part (2), the second connecting part (3) and the tension spring body (1) are all made of martensitic or semi-austenitic stainless steel.

5. A tension spring structure according to claim 1, characterized in that: The closing end (31) is arranged in an arc shape.

6. A tension spring structure according to claim 1, characterized in that: The number of spring coils (11) that actually participate in elastic deformation in the spiral coil structure is defined as the effective number of coils, which is 9.5 coils.

7. A tension spring structure according to claim 1, characterized in that: The surfaces of the first connecting part (2), the second connecting part (3) and the tension spring body (1) are all smooth.

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