High-reliability pin structure

Abstract

The utility model provides a high-reliability pin structure, which belongs to the technical field of pin and pin hole matching, comprises a press-fit section used for being inserted into a pin hole, and is characterized in that one end of the press-fit section is provided with an annular groove, the diameter of the annular groove is smaller than that of the pin hole, and the annular groove is positioned at an opening of the pin hole after the press-fit section is inserted into the pin hole. A gap is formed between the outer wall surface of the annular groove and the inner wall of the pin hole; the stress generated during interference fit of the pin hole can be released from the port, so that the situation that the opening of the pin hole is in a horn mouth shape due to stress concentration of the pin hole is prevented, the stability and the reliability of the pin after press fit are improved, and the pin is prevented from loosening and falling off.

Description

Technical Field

[0001] This utility model relates to the field of pin and pin hole mating technology, specifically to a highly reliable pin structure. Background Technology

[0002] With the diversification of electronic products, the application of pin structures in different scenarios is becoming more widespread and stringent. While fulfilling its guiding function, the safety, reliability, and durability of pins have also become key concerns.

[0003] Typically, a pin is installed with an interference fit to the pin hole in the housing. During assembly, a certain amount of external force is required to press or drive the pin into the pin hole. After assembly, a tight fit is formed between the pin and the pin hole, enabling functions such as positioning, connection, or load transfer between parts.

[0004] However, because the pin is forcibly pressed into the pin hole, the inner wall of the pin hole is squeezed by the pin, generating tensile stress. This causes the material of the pin hole to undergo elastic deformation. Since the outer wall of the existing pin is in complete contact with the pin hole, the stress in the pin hole will concentrate at the end and cannot be released smoothly. As a result, the insertion end of the pin hole will always be in an expanded state due to the filling of the pin press-fit section. The stress concentration cannot be released, causing the end of the pin hole to be flared. This creates a gap between the press-fit section of the pin and the end of the pin hole, leading to unreliable phenomena such as the pin tilting, loosening, and falling off. Utility Model Content

[0005] In view of this, the present invention provides a highly reliable pin structure that can release the stress generated during the interference fit of the pin hole from the end, thereby preventing stress concentration in the pin hole from causing its opening to become flared, improving the stability and reliability of the pin after press-fitting, and preventing the pin from loosening and falling off.

[0006] To solve the above-mentioned technical problems, this utility model provides a highly reliable pin structure, including a press-fit section. One end of the press-fit section has an annular groove, and the diameter of the annular groove is smaller than the diameter of the pin hole. When the operator presses the press-fit section and the pin hole together with an interference fit, the annular groove will be located at the opening of the pin hole, and there is a gap between the outer wall of the annular groove and the inner wall of the pin hole. This allows the stress of the pin hole to be released at the position of the annular groove, causing the pin hole to deform in the direction of the annular groove, making the opening of the pin hole smaller. This allows the press-fit section to fit more tightly with the pin hole, thereby improving the stability and reliability of the pin after press-fitting and preventing the pin from loosening and falling off.

[0007] There are multiple annular grooves. Workers can choose how many annular grooves to open on the surface of the pressing section according to the required fixed strength and the length of the pressing section. Multiple annular grooves are evenly distributed on the surface of the pressing section, so that the stress of the pin hole will be distributed at the position of each annular groove. Due to deformation, the pin hole will protrude a distance towards the position of the elastic groove, so that the two form an interlocking structure, thereby improving the stability of the pressing between the pressing section and the pin hole.

[0008] The equal spacing between each annular groove allows stress to be evenly distributed across each groove, resulting in a more uniform stress distribution and greater stability.

[0009] Each annular groove is coated with adhesive. When the press-fit section enters the pin hole, the adhesive on the surface of the annular groove can stick to the inner wall of the pin hole, thereby increasing the fixing strength between the press-fit section and the pin hole.

[0010] The adhesive is epoxy resin. After the press-fit section is inserted into the pin hole, the epoxy resin will cure after a certain period of time. The cured epoxy resin makes the tensile strength of the press-fit section higher, thereby further improving the fixing strength between the press-fit section and the pin hole.

[0011] A limiting block is fixed to the surface of the annular groove at the very end. The diameter of the limiting block is larger than the diameter of the pin hole. When the press-fit section is pressed into the pin hole, the limiting block will block the opening of the pin hole to prevent the press-fit section from going too deep into the pin hole, thereby controlling the press-fit depth and having a certain positioning effect on the effective length of the press-fit section.

[0012] The end of the press-fit section is equipped with a guide block. The diameter of the guide block is smaller than the diameter of the pin hole. This allows the small-diameter guide block to enter the pin hole first before the press-fit section is inserted into the pin hole. This guides the press-fit section as it enters the pin hole, allowing it to be pressed into the pin hole more accurately, preventing it from tilting and improving the accuracy of the press-fit.

[0013] The end of the guide block is provided with an inclined surface. When the guide block is inserted into the pin hole, the inclined surface buffers the insertion force to prevent the edge of the guide block from making hard contact with the inner wall of the pin hole, which would cause wear inside the pin hole.

[0014] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0015] 1. When this utility model is used, the design of the annular groove on the surface of the press-fit section allows the stress generated by the interference fit of the pin hole to be evenly released at the annular groove, avoiding stress concentration at the end to form a flared deformation, effectively preventing the pin from tilting and loosening, and significantly improving the structural stability after assembly.

[0016] 2. When this utility model is used, multiple evenly distributed annular grooves and deformed pin holes form a multi-point interlocking structure. Through the mechanical interlocking effect, the bonding strength between the press-fit section and the pin holes is greatly enhanced, which greatly improves the reliability of the connection. It is especially suitable for long-term use in high-frequency vibration environments.

[0017] 3. When this utility model is used, the elastic epoxy resin filling the annular groove forms a flexible support layer after curing, which not only improves tensile strength through chemical bonding, but also retains deformation space to maintain stress release function.

[0018] 4. When using this utility model, the pressing distance of the pressing section can be controlled by the limiting block to prevent pressing too deeply. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0020] Figure 2 This is a cross-sectional view of the pin hole after the press-fit section of this utility model is inserted into the pin hole;

[0021] Figure 3 For the present utility model Figure 2 Front sectional view of the annular groove after adhesive has been applied.

[0022] Explanation of reference numerals in the attached figures:

[0023] 100, Pressing section; 200, Guide block; 300, Annular groove; 301, Adhesive; 400, Limiting block; 500, Pin hole. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-3 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0025] A highly reliable pin structure, such as Figure 1 and Figure 2As shown: including the press-fit section 100, the operator can insert the press-fit section 100 into the pin hole 500 to make the two have an interference fit connection. One end of the press-fit section 100 has an annular groove 300. After the operator inserts the press-fit section 100 into the pin hole 500, the annular groove 300 will correspond to the opening position of the pin hole 500. Since the diameter of the annular groove 300 is smaller than the diameter of the pin hole 500, there is a certain gap between the outer wall of the annular groove 300 and the inner wall of the pin hole 500. When the pin hole 500 and the press-fit section 100 generate stress due to the interference fit, the opening of the pin hole 500 undergoes elastic deformation. Since there is a gap between the pin hole 500 and the annular groove 300, rather than an interference fit, the stress in the pin hole 500 is released at the position of the annular groove 300. This causes the pin hole 500 to deform in the direction of the annular groove 300, making the opening of the pin hole 500 smaller. Consequently, the press-fit section 100 fits more tightly with the pin hole 500, thus preventing the stress in the pin hole 500 from concentrating at the opening and causing it to become flared. This improves the stability and reliability of the pin after press-fitting and prevents the pin from loosening and falling off.

[0026] Specifically, workers can select the number of annular grooves 300 to be opened on the surface of the press-fit section 100 according to the required strength and the length of the press-fit section 100. Multiple annular grooves 300 are evenly distributed on the surface of the press-fit section 100. Due to the multiple annular grooves 300, the stress of the pin hole 500 can be distributed at the position of each annular groove 300. As a result, the pin hole 500 will protrude a certain distance towards the position of the elastic groove due to deformation. This allows the press-fit section 100 and the annular grooves 300 to cooperate with each other to form an interlocking structure with the deformed pin hole 500, thereby improving the fixing effect between the press-fit section 100 and the pin hole 500 and making the press-fit section 100 more firmly fixed.

[0027] Furthermore, the spacing between each annular groove 300 is the same, which allows the stress to be evenly distributed at the position of each annular groove 300, resulting in a more uniform stress distribution and stronger stability.

[0028] according to Figure 1 , Figure 2 and Figure 3 As shown, since the annular groove 300 at the very end of the press-fit section 100 corresponds to the opening of the pin hole 500, a limiting block 400 is provided on the surface of the annular groove 300 at the very end. The diameter of the limiting block 400 is larger than the diameter of the pin hole 500. This ensures that when the press-fit section 100 is pressed into the pin hole 500, the limiting block 400 will block the opening of the pin hole 500, so that the annular groove 300 at the very end will always be located at the opening of the pin hole 500. This controls the pressing distance of the press-fit section 100, prevents it from being pressed too deep, and has a certain positioning effect on the effective usable length of the press-fit section 100.

[0029] Specifically, a guide block 200 is provided at the end of the press-fit section 100. The diameter of the guide block 200 is smaller than the diameter of the pin hole 500. When the operator inserts the press-fit section 100, the guide block 200 will enter the pin hole 500 first. The small-diameter guide block 200 will guide the subsequent press-fit section 100, making it easier and more accurate to press the press-fit section 100 into the pin hole 500 and preventing the press-fit section 100 from deviating.

[0030] Furthermore, the end of the guide block 200 is provided with an inclined surface. The inclined surface can prevent the edges of the guide block 200 from making hard contact with the inner wall of the pin hole 500. The inclined surface can buffer the wear and prevent wear on the inner wall of the pin hole 500.

[0031] according to Figure 3 As shown, before the press-fit section 100 is inserted into the pin hole 500, depending on the required fixing strength, the operator may choose whether to apply adhesive 301 to the surface of the annular groove 300. If adhesive 301 is applied, after the press-fit section 100 enters the pin hole 500, the adhesive 301 on the surface of the annular groove 300 can adhere to the inner wall of the pin hole 500, thereby increasing the fixing strength between the press-fit section 100 and the pin hole 500.

[0032] Furthermore, the adhesive 301 is an epoxy resin adhesive. After the epoxy resin adhesive and the curing agent are mixed in a suitable ratio, it is applied to the surface of the annular groove 300. After the press-fit section 100 is inserted into the pin hole 500, the epoxy resin adhesive will cure after a certain period of time, thereby further improving the fixing strength of the press-fit section 100 and the pin hole 500. Moreover, the cured epoxy resin adhesive still has elasticity. Therefore, the epoxy resin adhesive will not affect the deformation of the pin hole 500 at the position of the annular groove 300, nor the stress release at the opening of the pin hole 500.

[0033] How to use this utility model:

[0034] When the press-fit section 100 needs to be pressed into the pin hole 500, the guide block 200 will first enter the pin hole 500, so that the small-diameter guide block 200 guides the press-fit section 100, so that the subsequent press-fit section 100 will directly follow the guide block 200 into the pin hole 500. After the press-fit section 100 is completely inside the pin hole 500, the limiting block 400 will block at the opening of the pin hole 500, so that the annular groove 300 at the very end of the press-fit section 100 will correspond to the opening of the pin hole 500. When the press-fit section 100 and the pin hole 500 are due to the interference fit, When stress is generated, since there is a gap between the pin hole 500 and the annular groove 300, rather than an interference fit, the stress in the pin hole 500 is released at the position of the annular groove 300. This causes the pin hole 500 to deform in the direction of the annular groove 300. At this time, the opening of the pin hole 500 will become smaller due to elastic deformation, which will make the press-fit section 100 fit more tightly with the pin hole 500. This avoids the stress in the pin hole 500 from concentrating at the opening, which would cause the opening to become funnel-shaped. This improves the stability and reliability of the pin after press-fitting and prevents the pin from loosening and falling off.

[0035] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A highly reliable pin structure, comprising a press-fit section (100) for insertion into a pin hole (500), characterized in that: One end of the press-fit section (100) is provided with an annular groove (300). The diameter of the annular groove (300) is smaller than the diameter of the pin hole (500). After the press-fit section (100) is inserted into the pin hole (500), the annular groove (300) will be located at the opening of the pin hole (500), and there is a gap between the outer wall of the annular groove (300) and the inner wall of the pin hole (500).

2. The highly reliable pin structure as described in claim 1, characterized in that: The number of annular grooves (300) is multiple, and the multiple annular grooves (300) are evenly distributed on the surface of the press section (100).

3. The highly reliable pin structure as described in claim 2, characterized in that: The spacing between each pair of the annular grooves (300) is the same.

4. The highly reliable pin structure as described in claim 2, characterized in that: Each of the annular grooves (300) is coated with adhesive (301).

5. The highly reliable pin structure as described in claim 4, characterized in that: The adhesive (301) is an epoxy resin adhesive.

6. The highly reliable pin structure as described in claim 1, characterized in that: A limiting block (400) is fixed to the surface of the annular groove (300) at the far end, and the diameter of the limiting block (400) is larger than the diameter of the pin hole (500).

7. The highly reliable pin structure as described in claim 1, characterized in that: The end of the press section (100) is provided with a guide block (200), the diameter of which is smaller than the diameter of the pin hole (500).

8. The highly reliable pin structure as described in claim 7, characterized in that: The guide block (200) has an inclined surface at its end.

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