S-shaped tail high-retention force precision pin connector assembly

Abstract

This invention relates to the technical field of precision electronic connectors. It discloses an S-shaped tail high-holding-force precision pin connection assembly, including a core and a pin. The core has an insertion hole, and the pin has an S-shaped locking section. The front end of the S-shaped locking section is axially positioned relative to the core via a positioning structure. The crest of the S-shaped locking section has a hollowed-out groove to generate local radial compensation when the insertion hole diameter expands outward. The tail end of the S-shaped locking section is connected to a tail rod. A multi-stage axial resistance mating part is provided between the tail rod and the tail end hole of the core. A compensation stroke interval is formed between adjacent resistance mating positions. When the local radial compensation of the crest is insufficient, the tail rod can move in stages between different resistance mating positions, allowing the S-shaped locking section to release its axial contraction stroke and allowing the crest to continue pressing against the inner wall of the insertion hole. This maintains the pin locking force even after core creep, wear, or thermal deformation, improving the pin's holding force, vibration resistance, and electrical stability.

Description

Technical Field

[0001] This invention belongs to the technical field of precision electronic connectors, and more specifically, it relates to a precision pin connection assembly with high holding force at an S-shaped tail. Background Technology

[0002] Existing precision connector pins are typically of straight rod, single-step, knurled, or simply bent structure. These pins are usually embedded in the insertion hole of the connector core through interference fit, a single snap-fit, or a partial friction structure. This type of structure can achieve a certain holding force in the initial assembly state, but its locking effect mainly depends on the interference or friction between the pin and the insertion hole of the core. When the connector is subjected to long-term vibration, high and low temperature cycling, insertion and extraction impact, or continuous compression, the plastic core is prone to creep, wear, or thermal deformation, causing the insertion hole diameter to gradually enlarge. The original interference fit decreases accordingly, resulting in a reduction in the radial preload between the pin and the core.

[0003] While existing S-shaped tail pins can improve initial holding force and absorb vibration stress to some extent by utilizing the elastic deformation of the S-shaped bend, their elastic compensation capability mainly comes from the overall pre-compression stroke of the S-shaped segment. When the core insertion hole only slightly expands outward, existing S-shaped pins lack a local micro-compensation structure, making it difficult to quickly compensate for the small gap between the crest and the hole wall. When the core insertion hole expands significantly or continuously, the overall elastic stroke of the S-shaped segment is easily consumed at once, failing to release the axial contraction stroke in stages. This leads to a significant decrease in locking force in the later stages, and may even result in pin axial movement, radial wobble, contact resistance fluctuations, or loosening failure.

[0004] In addition, precision inserts are usually small in diameter, for example, the diameter of the middle rod can be about 1mm. If complex micro ratchet, sleeve, spring or multi-stage snap-fit ​​structure is set on the outer periphery of the insert body, it is easy to cause problems such as high processing difficulty, high assembly accuracy requirements, poor plating consistency, high risk of jamming and high manufacturing cost.

[0005] Therefore, how to enable the insert to adapt to the entire process of the core insertion hole from slight to continuous expansion without significantly increasing the processing complexity, and to maintain a stable contact between the insert and the core over a long period of time, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The present invention provides an S-shaped tail high-holding-force precision pin connection assembly to overcome the above-mentioned defects in the prior art.

[0007] The purpose and effect of the S-shaped tail high-holding-force precision pin connection assembly of the present invention are achieved by the following specific technical means: A high-holding-force precision insert connector assembly with an S-shaped tail includes a core and a insert. The core has an insertion hole for inserting the insert. The insert has an S-shaped locking section, the front end of which is axially positioned relative to the core via a positioning structure. The S-shaped locking section has a crest portion for abutting against the inner wall of the insertion hole. The crest portion has a slot to provide radial compensation when the diameter of the insertion hole expands outward. A tail rod is connected to the tail end of the S-shaped locking section. A multi-stage axial locking fit is provided between the tail rod and the tail end hole of the core. The multi-stage axial locking fit includes multiple locking fit positions distributed along the axial direction of the tail rod. Each locking fit position includes a locking fit surface formed on the outer periphery of the tail rod and the inner wall of the tail end hole. A compensation stroke interval for axial movement of the tail rod is formed between two adjacent locking fit positions.

[0008] In a further technical solution, the hollow groove is disposed on the side of the crest portion near its radially convex outer wall surface, and the hollow groove extends along the curvature direction of the crest portion.

[0009] In a further technical solution, the hollowed-out groove divides the wave crest into an outer arch shell portion close to the radially convex outer wall surface and a support arm located inside the outer arch shell portion, wherein the thickness of the outer arch shell portion is less than the thickness of the support arm.

[0010] A further technical solution is that the positioning structure includes an axial positioning shoulder disposed on the insert pin and an elastic positioning step disposed in the insertion hole. The elastic positioning step can make radial elastic clearance and restrict the axial movement of the front end of the S-shaped locking section.

[0011] In a further technical solution, the insertion hole is provided with a locking groove corresponding to the crest portion, and the crest portion is at least partially engaged in the locking groove.

[0012] In a further technical solution, the plurality of the blocking mating positions include a plurality of elastic limiting portions spaced apart along the axial direction of the tail end hole, and the tail rod is provided with a tail shoulder for abutting against the elastic limiting portions, and the elastic limiting portions and the tail shoulder respectively form the blocking mating surfaces.

[0013] In a further technical solution, the elastic limiting part is an elastic baffle, elastic latch, or elastic ring formed on the inner wall of the tail end hole. The elastic limiting part includes a guide surface facing the tail rod compensation movement direction and a stop surface facing away from the tail rod compensation movement direction.

[0014] A further technical solution is that the plurality of the resisting mating positions include a plurality of friction mating sections axially spaced along the inner wall of the tail end hole, and at least two of the friction mating sections have different inner diameters, surface roughness, surface morphology or friction materials, so that the tail rod is subjected to different axial sliding resistances at different resisting mating positions.

[0015] In a further technical solution, at least one of the friction mating sections has a tapered friction surface, and the outer periphery of the tail rod is provided with a mating tapered surface for abutting against the tapered friction surface.

[0016] A further technical solution is that the hole wall of the tail end hole is provided with an axially extending elastic groove, the elastic groove penetrating at least one of the friction fit sections, so that the hole wall of the tail end hole can be radially elastically deformed when the tail rod moves axially.

[0017] Compared with the prior art, the present invention has the following beneficial effects: First, the present invention provides a hollowed-out groove in the crest of the S-shaped locking section, so that the crest forms an outer arch shell near the radially convex outer wall and a support arm located on the inner side. When the core insertion hole slightly expands outward, the outer arch shell can preferentially generate local elastic expansion compensation, so that the crest continues to press against the inner wall of the insertion hole, thereby achieving rapid compensation for slight creep, slight wear or initial gap of thermal deformation.

[0018] Secondly, the present invention connects a tail rod to the end of the S-shaped locking section and sets up a multi-stage axial blocking engagement part between the tail rod and the end hole of the rubber core, so that the tail rod can move in stages between different blocking engagement positions. When the local radial compensation of the crest part is insufficient, the tail rod releases the axial contraction stroke of the S-shaped locking section step by step, so that the crest part of the S-shaped locking section further compensates outward and presses against the inner wall of the insertion hole, thereby improving the long-term holding force of the insertion pin after the continuous creep of the rubber core.

[0019] Third, the present invention forms a two-level compensation mechanism of "local micro-compensation of the crest" and "graded large compensation of the tail rod in the axial direction". When the aperture expands slightly, the outer arch shell corresponding to the hollow groove of the crest performs rapid micro-compensation; when the aperture expands further, the tail rod and the multi-stage axial resistance mating part perform graded stroke release. The two form a relay compensation relationship, which can cover different stages of the rubber core from slight creep to continuous creep.

[0020] Fourth, this invention can reduce the axial movement and radial wobble of the pin caused by the expansion of the core hole diameter, and reduce the gap amplification phenomenon between the pin and the core under vibration environment, thereby improving the vibration resistance and contact resistance stability. It is suitable for high vibration and high reliability connection scenarios such as automotive on-board modules, battery connectors, sensor interfaces, and medical electronic equipment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the pin in this invention; Figure 3 This is a schematic diagram of the S-shaped locking section of the present invention; Figure 4 This is a cross-sectional schematic diagram of the adhesive core in this invention; Figure 5 This is a schematic diagram of the structure when the insert and the core are engaged in this invention; Figure 6 This is a schematic diagram of the internal structure of the tail end hole in the first embodiment of the present invention; Figure 7 This is a schematic diagram of the internal structure of the tail end hole in the second embodiment of the present invention; Figure 8 This is a schematic diagram of the internal structure of the tail end hole in the third embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures: 10. Glue core, 11. Insertion hole, 12. Elastic positioning step, 13. Locking groove, 14. Elastic limiting part, 141. Guide surface, 142. Anti-reverse surface, 15. Friction mating section, 151. Tapered friction surface, 16. Elastic slot. Pin 20, Head conductive section 21, Middle positioning section 22, S-shaped locking section 23, First crest section 231, Second crest section 232, Hollowed-out groove 233, Outer arch shell section 234, Support arm 235, Tail rod 24, Tail shoulder 241, Mating cone surface 242, Axial positioning shoulder 25, 26 First high resistance surface, 27 Second high resistance surface, 28 Third high resistance surface, 29 First-level damping surface, 30 Second-level damping surface, 31 Third-level damping surface. Detailed Implementation

[0023] The technical solution of the present invention will be further described below with reference to the embodiments. It should be understood that the following embodiments are only used to illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. All equivalent substitutions, modifications or combinations made based on the concept of the present invention should fall within the scope of protection of the present invention.

[0024] This embodiment provides an S-shaped tail high holding force precision pin connection assembly, including a core 10 and a pin 20. The core 10 is provided with an insertion hole 11 for the pin 20 to be inserted.

[0025] The pin 20 is a single piece of metal, comprising, along the axial direction, a head conductive section 21, a middle positioning section 22, an S-shaped locking section 23, and a tail rod 24. The head conductive section 21 is used to form an electrical connection with an external mating terminal or conductive hole; the middle positioning section 22 is used to mate with the core 10 to limit the insertion depth of the pin 20 and form an axial positioning reference for the front end of the S-shaped locking section 23; the S-shaped locking section 23 is used to form an elastic abutment and lock with the inner wall of the insertion hole 11; the tail rod 24 is used to mate with the tail end hole of the core 10 to release the axial retraction stroke of the S-shaped locking section 23 in stages after the insertion hole 11 of the core 10 expands outward due to long-term use.

[0026] In one embodiment, the conductive head section 21 adopts a tapered guide structure with a rounded chamfer at its end to avoid scratching the inner wall of the terminal when it is inserted into the mating terminal. The taper angle of the conductive head section 21 can be 23°-25°, the diameter of the conductive head section 21 can be 0.3mm-1.2mm, and the length can be 2mm-5mm.

[0027] The intermediate positioning section 22 is a cylindrical straight rod structure with an outer diameter larger than that of the head conductive section 21, forming an axial positioning shoulder 25 between them. The insertion hole 11 has an elastic positioning step 12 that mates with the axial positioning shoulder 25. The elastic positioning step 12 can radially and elastically yield, allowing the axial positioning shoulder 25 to pass over it during the insertion of the pin 20. After the axial positioning shoulder 25 passes over the elastic positioning step 12, the elastic positioning step 12 returns to its original position and abuts against the axial positioning shoulder 25, thereby restricting the front end of the S-shaped locking section 23 from moving in the opposite direction to the insertion direction of the pin 20.

[0028] In one embodiment, the S-shaped locking section 23 is a continuous curved structure with double peaks, including a first peak portion 231 and a second peak portion 232. The first peak portion 231 and the second peak portion 232 are used to abut against the inner wall of the insertion hole 11, or to respectively engage with the locking groove 13 on the inner wall of the insertion hole 11. The total length of the S-shaped locking section 23 can be 3mm-6mm, and the bending height can be 0.2mm-0.6mm. Preferably, the bending transition of the S-shaped locking section 23 is a smooth arc structure to avoid stress concentration caused by sharp corners.

[0029] Preferably, at least one crest portion is provided with a hollowed-out groove 233. The hollowed-out groove 233 is disposed on the side of the corresponding crest portion near its radially convex outer wall surface and extends along the curvature direction of the corresponding crest portion. The hollowed-out groove 233 divides the corresponding crest portion into an outer arch shell portion 234 near the radially convex outer wall surface and a support arm 235 located inside the outer arch shell portion 234, the thickness of the outer arch shell portion 234 being less than the thickness of the support arm 235. In this embodiment, when the insertion hole 11 of the core 10 expands slightly outward due to slight creep, wear, or thermal deformation, the outer arch shell portion 234 on the outer side of the crest portion can preferentially undergo local elastic deformation, causing a slight compensation to the radially convex height of the first crest portion 231 and / or the second crest portion 232, thereby continuing to press against the inner wall of the insertion hole 11. This structure can quickly compensate for the initial slight outward expansion of the core 10's hole diameter without causing a large stroke movement of the entire S-shaped locking section 23.

[0030] In one specific embodiment, taking a product with a diameter of approximately 1.0 mm for the intermediate positioning section 22 of the pin 20 as an example, the thickness of the outer arch shell 234 can be 0.04 mm to 0.06 mm, the thickness of the support arm 235 can be 0.08 mm to 0.12 mm, the axial width of the hollow groove 233 can be 0.05 mm to 0.15 mm, and the radial depth of the hollow groove 233 can be 30% to 50% of the thickness of the corresponding crest portion. The above dimensions are only examples, and the actual dimensions can be adjusted according to the diameter of the pin 20, the hardness of the core 10 material, the holding force requirements, and the assembly pressing force.

[0031] Preferably, the tail rod 24 is connected to the tail end of the S-shaped locking section 23 and extends into the tail end hole of the rubber core 10. A multi-stage axial locking fit is provided between the tail rod 24 and the tail end hole. The multi-stage axial locking fit includes multiple locking fit positions distributed along the axial direction of the tail rod 24. Each locking fit position includes a locking fit surface formed on the outer periphery of the tail rod 24 and the inner wall of the tail end hole. A compensating stroke interval for axial movement of the tail rod 24 is formed between two adjacent locking fit positions.

[0032] In this embodiment, when the outward expansion of the insertion hole 11 of the core 10 is small, the hollowed-out groove 233 on the crest portion and the outer arch shell portion 234 provide the first-level radial compensation. When the insertion hole 11 of the core 10 continues to expand outward and exceeds the local compensation range of the crest portion, the S-shaped locking section 23 releases the elastic potential energy stored during the assembly process and drives the tail rod 24 to move axially relative to the tail end hole of the core 10. After the tail rod 24 moves from the current blocking fit position to the adjacent blocking fit position, the S-shaped locking section 23 releases the axial contraction stroke corresponding to the compensation stroke interval, so that the first crest portion 231 and the second crest portion 232 further compensate outward, thereby re-clamping against the inner wall of the insertion hole 11. Thus, this embodiment forms a two-level compensation mechanism through local elastic compensation of the crest portion and graded axial compensation of the tail rod 24.

[0033] In the first embodiment of the tail rod 24 graded compensation, the multiple blocking engagement positions include multiple elastic limiting portions 14 spaced axially along the tail end hole, and the tail rod 24 is provided with a tail shoulder 241 for abutting against the elastic limiting portions 14. The elastic limiting portion 14 can be an elastic baffle, elastic latch, or elastic ring formed on the inner wall of the tail end hole. The elastic limiting portion 14 includes a guide surface 141 facing the compensation movement direction of the tail rod 24 and a stop surface 142 facing away from the compensation movement direction of the tail rod 24. When the tail rod 24 is subjected to the axial driving force of the S-shaped locking section 23, the tail shoulder 241 first abuts against the current elastic limiting portion 14; when the axial driving force reaches a set value, the tail shoulder 241 pushes the elastic limiting portion 14 radially elastically to make way along the guide surface 141, and passes over the elastic limiting portion 14 to enter the next blocking engagement position. After the tail stop 241 passes the elastic limit part 14, the elastic limit part 14 resets, and its anti-reverse surface 142 can restrict the tail rod 24 from retracting in the opposite direction, thereby realizing the step-by-step movement of the tail rod 24.

[0034] In the second embodiment of graded compensation for tail rod 24, the multiple retardation mating positions include multiple friction mating sections 15 axially spaced along the inner wall of the tail end hole. At least two friction mating sections 15 have different inner diameters, surface roughness, surface morphology, or friction materials, so that the tail rod 24 is subjected to different axial sliding resistances at different retardation mating positions.

[0035] Preferably, at least one friction-fitting section 15 has a tapered friction surface 151, and the outer periphery of the tail rod 24 is provided with a mating tapered surface 242 for abutting against the tapered friction surface 151. Through the contact between the tapered friction surface 151 and the mating tapered surface 242, a stable axial blocking fit can be formed between the tail rod 24 and the inner wall of the tail end hole, while avoiding the tail rod 24 from jamming due to local sharp corner interference.

[0036] In one specific embodiment, the inner wall of the tail end hole forms a tapered friction hole section, and the outer periphery of the tail rod 24 is provided with a mating tapered surface 242 that abuts against the tapered friction hole section. The tapered friction hole section is provided axially with a first-stage damping surface 29, a first high-resistance surface 26, a second-stage damping surface 30, a second high-resistance surface 27, a third-stage damping surface 31, and a third high-resistance surface 28.

[0037] Among them, the surface friction coefficients of the first high-resistance surface 26, the second high-resistance surface 27, and the third high-resistance surface 28 are greater than the surface friction coefficients of the adjacent first-level damping surface 29, the second-level damping surface 30, and the third-level damping surface 31, respectively, so that the tail rod 24 can generate relatively gentle axial sliding resistance when passing through the first-level damping surface 29, the second-level damping surface 30, and the third-level damping surface 31, and is subjected to greater axial resistance force when passing through the first high-resistance surface 26, the second high-resistance surface 27, and the third high-resistance surface 28.

[0038] Preferably, the surface friction coefficients of the primary damping surface 29, the secondary damping surface 30, and the tertiary damping surface 31 decrease sequentially along the compensating movement direction of the tail rod 24, so that after the elastic potential energy of the S-shaped locking section 23 is gradually released, the tail rod 24 can still generate compensating movement between subsequent locking engagement positions.

[0039] Furthermore, the surface friction coefficients of the first high-resistance surface 26, the second high-resistance surface 27, and the third high-resistance surface 28 can also be decreased sequentially along the compensation movement direction of the tail rod 24, so that each level of high-resistance surface forms a graded release threshold that is compatible with the remaining elastic driving force of the S-shaped locking section 23; or, the surface friction coefficients of the first high-resistance surface 26, the second high-resistance surface 27, and the third high-resistance surface 28 can be increased sequentially along the compensation movement direction of the tail rod 24, so as to improve the over-release prevention capability in the subsequent compensation stage.

[0040] Furthermore, the wall of the tail end hole is provided with an axially extending elastic slot 16. The elastic slot 16 penetrates at least a portion of the first-level damping surface 29, the first high-resistance surface 26, the second-level damping surface 30, the second high-resistance surface 27, the third-level damping surface 31, and the third high-resistance surface 28, so that the tapered friction hole section can be radially elastically deformed when the tail rod 24 moves axially, thereby maintaining the frictional contact between the tapered friction hole section and the mating tapered surface 242 and reducing the risk of the tail rod 24 jamming. The elastic slot 16 can be a single slot or multiple slots arranged at intervals along the circumference of the tail end hole.

[0041] In one specific embodiment, to facilitate the formation of a stable graded axial damping effect, the equivalent friction coefficients of the first-level damping surface 29, the second-level damping surface 30, and the third-level damping surface 31 can be set to 0.08-0.35; the equivalent friction coefficients of the first high-resistance surface 26, the second high-resistance surface 27, and the third high-resistance surface 28 can be set to 0.20-0.80. The equivalent friction coefficient refers to the comprehensive friction coefficient formed by the mating conical surface 242 of the tail rod 24 and the conical friction hole section under actual contact conditions, which can be determined by surface roughness, surface texture, coating material, core material, and the cone angle of the conical friction surface 151.

[0042] Preferably, the equivalent friction coefficient of the first high-resistance surface 26 is 1.2-3 times that of the adjacent first-level damping surface 29, the equivalent friction coefficient of the second high-resistance surface 27 is 1.2-3 times that of the adjacent second-level damping surface 30, and the equivalent friction coefficient of the third high-resistance surface 28 is 1.2-3 times that of the adjacent third-level damping surface 31, so that the tail rod 24 can slide slowly at the damping surface and form a staged resistance at the high-resistance surface.

[0043] In one embodiment, the equivalent friction coefficients of the primary damping surface 29, the secondary damping surface 30, and the tertiary damping surface 31 are 0.25, 0.18, and 0.12, respectively, and the equivalent friction coefficients of the first high-resistance surface 26, the second high-resistance surface 27, and the third high-resistance surface 28 are 0.45, 0.35, and 0.25, respectively. This allows the tail rod 24 to pass through multiple resistance engagement positions and release the corresponding compensation stroke as the remaining elastic driving force of the S-shaped locking section 23 gradually decreases.

[0044] In another embodiment, the equivalent friction coefficients of the primary damping surface 29, the secondary damping surface 30, and the tertiary damping surface 31 decrease sequentially, while the equivalent friction coefficients of the first high-resistance surface 26, the second high-resistance surface 27, and the third high-resistance surface 28 increase sequentially, so that the subsequent locking mating position has a higher anti-excessive slippage capability. In practical applications, the equivalent friction coefficients of each damping surface and high-resistance surface can be adjusted according to the material hardness of the core 10, the diameter of the pin 20, the elastic restoring force of the S-shaped locking section 23, and the target compensation stroke.

[0045] The assembly process of this embodiment is as follows: The conductive section 21 of the head of the insert 20 is aligned with the insertion hole 11 of the core 10, and it is pressed in axially using automated equipment or a fixture. During the pressing process, the axial positioning shoulder 25 of the intermediate positioning section 22 pushes the elastic positioning step 12 to make radial clearance and passes over the elastic positioning step 12; at the same time, the S-shaped locking section 23 is squeezed by the inner wall of the insertion hole 11 and retracts radially, storing elastic potential energy. After the insert 20 is pressed in place, the elastic positioning step 12 resets and restricts the front end of the S-shaped locking section 23 from moving in the pull-out direction. The first crest 231 and the second crest 232 rebound and press against the inner wall of the insertion hole 11 or are locked into the locking groove 13. The tail rod 24 enters the tail end hole and is in the initial resisting engagement position.

[0046] During use, when the connector is subjected to vibration, high and low temperature cycling, or long-term compression, the core 10 may creep or wear, causing the diameter of the insertion hole 11 to gradually enlarge. When the diameter enlarges slightly, the outer arch shell 234 on the crest portion undergoes local elastic expansion, forming the first stage of radial compensation. When the diameter continues to enlarge and exceeds the first stage of compensation, the S-shaped locking section 23 drives the tail rod 24 to overcome the axial resistance of the current blocking engagement position, causing the tail rod 24 to move to the next blocking engagement position, thereby releasing a portion of the axial contraction stroke. After the axial span of the S-shaped locking section 23 decreases, the radial outward convexity of the first crest portion 231 and the second crest portion 232 increases, causing the first crest portion 231 and the second crest portion 232 to re-press against the inner wall of the insertion hole 11. As the creep process of the core 10 continues, the tail rod 24 can move sequentially to subsequent blocking engagement positions, thereby achieving multi-stage compensation.

[0047] In one specific application example, pin 20 is used in a high-vibration-resistance connector for automotive electronics. Pin 20 has an overall length of 12mm, a conductive head section 21 with a diameter of 0.8mm, a middle positioning section 22 with a diameter of 1.0mm, an S-shaped locking section 23 with a length of 5mm, and a bending height of 0.5mm. The base material of pin 20 is made of high-strength phosphor bronze, with a nickel-plated gold plating layer on the surface. The gold plating thickness can be 0.1μm to improve high-temperature resistance, oxidation resistance, and conductivity stability. This pin 20 can be used in high-vibration and high-temperature-difference applications such as automotive modules, battery connectors, and sensor interfaces.

[0048] In another embodiment, the substrate of the pin 20 is made of high-precision phosphor bronze alloy with a conductivity of not less than 60% IACS and a hardness of HV180-HV220. The surface of the pin 20 can be treated with nickel plating and gold plating, wherein the thickness of the bottom nickel plating is 0.8μm-1.2μm and the thickness of the top gold plating is 0.05μm-0.1μm. The surface of the intermediate positioning section 22 can also be provided with micro-textured knurling, with a knurling depth of 0.02mm-0.05mm, to help improve the radial holding force between the pin 20 and the core 10.

[0049] In this embodiment, the overall dimensional tolerance of the insert 20 can be controlled to a diameter tolerance of ±0.01mm and a length tolerance of ±0.05mm. The bending coaxiality of the S-shaped locking section 23 can be controlled within 0.2mm to meet the requirements of precision automated assembly. Through the elastic locking of the S-shaped locking section 23, the local radial compensation of the hollowed-out groove 233 at the crest, and the multi-stage axial resistance compensation between the tail rod 24 and the tail end hole, the insert 20 can continue to maintain stable contact with the inner wall of the insertion hole 11 after the core 10 undergoes creep, wear, or thermal deformation, thereby improving the axial holding force, vibration resistance, and long-term electrical reliability.

[0050] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A high-holding-force precision pin connector assembly with an S-shaped tail, comprising a core and a pin, wherein the core has an insertion hole for inserting the pin, and the pin has an S-shaped locking section, characterized in that, The front end of the S-shaped locking section is axially positioned relative to the rubber core by a positioning structure; The S-shaped locking section has a crest portion for abutting against the inner wall of the insertion hole. The crest portion is provided with a hollow groove so that the crest portion can generate radial compensation when the diameter of the insertion hole expands outward. The tail end of the S-shaped locking section is connected to a tail rod. A multi-stage axial locking engagement part is provided between the tail rod and the tail end hole of the rubber core. The multi-stage axial locking engagement part includes multiple locking engagement positions distributed along the axial direction of the tail rod. Each locking engagement position includes a locking engagement surface formed on the outer periphery of the tail rod and the inner wall of the tail end hole. A compensation stroke interval for axial movement of the tail rod is formed between two adjacent locking engagement positions.

2. The S-shaped tail high-holding-force precision pin connection assembly as described in claim 1, characterized in that, The hollow groove is disposed on the side of the crest portion near its radially convex outer wall surface, and the hollow groove extends along the curvature direction of the crest portion.

3. The S-shaped tail high-holding-force precision pin connection assembly as described in claim 1, characterized in that, The hollowed-out groove divides the wave crest into an outer arch shell near the radially convex outer wall and a support arm located inside the outer arch shell. The thickness of the outer arch shell is less than the thickness of the support arm.

4. The S-shaped tail high-holding-force precision pin connection assembly as described in claim 1, characterized in that, The positioning structure includes an axial positioning shoulder disposed on the insert pin and an elastic positioning step disposed in the insertion hole. The elastic positioning step can make radial elastic clearance and restrict the axial movement of the front end of the S-shaped locking section.

5. The S-shaped tail high-holding-force precision pin connection assembly as described in claim 1, characterized in that, The insertion hole is provided with a locking groove corresponding to the crest portion, and the crest portion is at least partially engaged in the locking groove.

6. The S-shaped tail high-holding-force precision pin connection assembly as described in claim 1, characterized in that, The plurality of said blocking mating positions include a plurality of elastic limiting portions spaced apart along the axial direction of the tail end hole, and the tail rod is provided with a tail shoulder for abutting against the elastic limiting portions, and the elastic limiting portions and the tail shoulder respectively form the blocking mating surfaces.

7. The S-shaped tail high-holding-force precision pin connection assembly as described in claim 6, characterized in that, The elastic limiting part is an elastic baffle, elastic latch, or elastic retaining ring formed on the inner wall of the tail end hole. The elastic limiting part includes a guide surface facing the tail rod compensation movement direction and a stop surface facing away from the tail rod compensation movement direction.

8. The S-shaped tail high-holding-force precision pin connection assembly as described in claim 1, characterized in that, The plurality of said retardation mating positions include a plurality of friction mating sections axially spaced along the inner wall of the tail end hole. At least two of the friction mating sections have different inner diameters, surface roughness, surface morphology or friction materials, so that the tail rod is subjected to different axial sliding resistances at different retardation mating positions.

9. The S-shaped tail high-holding-force precision pin connection assembly as described in claim 8, characterized in that, At least one of the friction mating sections has a tapered friction surface, and the outer periphery of the tail rod is provided with a mating tapered surface for abutting against the tapered friction surface.

10. The S-shaped tail high-holding-force precision pin connection assembly as described in claim 8, characterized in that, The hole wall of the tail end hole is provided with an axially extending elastic groove, which penetrates at least one of the friction fit sections, so that the hole wall of the tail end hole can be radially elastically deformed when the tail rod moves axially.

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