Diameter-expandable nylon rod pin and nylon rod pin coupling

Abstract

The utility model provides a diameter-expandable nylon rod pin which comprises a nylon rod body, and a through hole is formed in the axial center of the nylon rod body. The high-strength countersunk bolt comprises a countersunk end and a screw part, the diameter of the countersunk end is larger than the aperture of the through hole, the countersunk end is embedded into the counter bore in one end of the nylon rod body, and the screw part penetrates through the through hole; the countersunk head nut comprises a countersunk head groove, and the countersunk head nut is in threaded connection with the tail end of the screw rod part; the outer surface of the tail end of the countersunk nut and the end face of the end, away from the high-strength countersunk bolt, of the nylon rod body are coplanar. The diameter of the nylon rod pin can be expanded or shrunk within a certain range, so that the overall connection strength is improved, and different assembly size requirements are met.

Description

Technical Field

[0001] This application relates to the field of transmission structure technology, and in particular to a nylon rod pin with an expandable diameter. Background Technology

[0002] HL-type flexible pin couplings, as key components in mechanical transmission systems, are widely used in various mechanical equipment, primarily for connecting two shafts and transmitting torque. One of its core components is the nylon rod pin, which, by inserting the nylon rod pin into the coupling hole of the coupling wheel, achieves a reliable connection between the two half-couplings.

[0003] The nylon rod pin has a solid cylindrical structure, exhibiting excellent elasticity and wear resistance, effectively absorbing impact loads and vibration energy generated during transmission. Multiple evenly distributed connecting holes on the coupling precisely mate with the nylon rod pin, and a nylon rod baffle securely fixes the pin to the outer end face of the half-coupling, thus ensuring structural stability and reliability during transmission.

[0004] However, as mechanical equipment develops towards higher power and higher speed, the existing nylon rod-pin structure has gradually revealed some technical problems. At the moment of equipment startup, due to the large instantaneous impact load, the nylon rod-pin is prone to breakage due to insufficient strength, leading to connection failure and seriously affecting the normal operation of the equipment. Utility Model Content

[0005] This application provides a nylon rod pin with an expandable diameter to solve the problem that nylon rod pins are prone to breakage at startup due to insufficient strength in high-power, high-speed mechanical transmission systems.

[0006] This application provides a nylon rod pin with an expandable diameter, including a nylon rod body, wherein the nylon rod body has a through hole at its axial center;

[0007] A high-strength countersunk bolt, comprising a countersunk end and a threaded portion, wherein the diameter of the countersunk end is larger than the diameter of the through hole and is embedded in the countersunk hole at one end of the nylon rod body, and the threaded portion passes through the through hole;

[0008] A countersunk nut, comprising a countersunk groove, wherein the countersunk nut is threadedly connected to the end of the screw portion; the outer surface of the end of the countersunk nut is coplanar with the end face of the nylon rod body away from the high-strength countersunk bolt.

[0009] In one feasible implementation, the diameter of the through hole is half the diameter of the nylon rod body.

[0010] In one feasible implementation, the diameter of the high-strength countersunk bolt is smaller than the diameter of the through hole.

[0011] In one feasible implementation, the countersunk end diameter of the high-strength countersunk bolt is 2 / 3 of the diameter of the nylon rod body.

[0012] In one feasible implementation, the countersunk end of the high-strength countersunk bolt is provided with a hexagonal hole.

[0013] In one feasible implementation, a disc spring is provided between the countersunk nut and the nylon rod body, and the disc spring is sleeved on the screw portion.

[0014] In one feasible implementation, the outer surface of the nylon rod body is provided with an elastic buffer layer.

[0015] In one feasible implementation, the inner wall of the countersunk groove of the countersunk nut is provided with an annular self-locking groove, and the end of the screw is provided with a radial elastic protrusion.

[0016] A nylon rod pin coupling includes nylon rod pins;

[0017] A coupling assembly, wherein the coupling assembly is provided with a ring array of coupling connection holes; the nylon rod pin passes through the coupling connection holes;

[0018] A baffle assembly, which is fixed to the outer end face of the wheel assembly by fasteners.

[0019] In one feasible implementation, the coupling assembly is formed by the mating of a symmetrically arranged first half-coupling and a second half-coupling, with the coupling connecting holes of the coupling evenly distributed circumferentially on the mating surface.

[0020] The baffle assembly includes a nylon rod baffle and circumferentially distributed fastening bolts. The fastening bolts pass through the nylon rod baffle and are threadedly connected to the first half-coupling and the second half-coupling.

[0021] This application provides an expandable nylon rod pin, which, through the design of a high-strength countersunk bolt and countersunk nut, ensures a strong fastening force between the nylon rod pin and the coupling after installation, thereby improving the overall connection strength. Because it has a through hole and is fixed by the high-strength countersunk bolt and nut, the diameter of the nylon rod pin can be finely adjusted according to actual needs, allowing it to expand or contract within a certain range to adapt to different assembly size requirements. The introduction of components such as disc springs and elastic buffer layers not only absorbs vibration and reduces wear but also improves the stability and service life of the nylon rod pin. The countersunk end of the high-strength countersunk bolt has a hexagonal hole, facilitating tool insertion and rotation, making installation and disassembly more convenient and efficient. The countersunk nut has an annular self-locking groove on the inner wall of the countersunk groove, which, together with the radial elastic protrusion at the end of the screw, effectively prevents the nut from loosening, enhancing safety and reliability. Attached Figure Description

[0022] Figure 1 This is a schematic cross-sectional view of the diameter expandable nylon rod pin provided in this application;

[0023] Figure 2 yes Figure 1 Left view of a medium-diameter expandable nylon rod pin;

[0024] Figure 3 yes Figure 1 Right view of the middle diameter expandable nylon rod pin;

[0025] Figure 4 This is a schematic diagram of a nylon rod pin coupling;

[0026] Figure 5 yes Figure 4 A schematic diagram of the structure of the wheel assembly and the baffle assembly.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1-Nylon rod body; 2-High-strength countersunk bolt; 3-Countersunk nut; 4-Gear assembly; 5-Baffle assembly;

[0029] 11-Through hole; 12-Counterhead hole; 13-Elastic buffer layer; 21-Counterhead end; 22-Screw part; 31-Counterhead groove; 32-Disc spring; 33-Annular self-locking groove; 34-Radial elastic protrusion; 40-Girder coupling hole; 41-First half coupling; 42-Second half coupling; 51-Nylon rod baffle; 52-Fastening bolt. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of this application.

[0031] The existing HL-type flexible pin coupling uses nylon rods that are directly inserted into the coupling holes of the coupling. Due to the high power and shaft speed of the equipment, and the large load force at startup, the nylon rod body is not strong enough and is prone to breakage, causing connection failure and affecting equipment operation. The following, with reference to the accompanying drawings, provides a detailed description of the specific structure of the expandable diameter nylon rod pin provided in this application.

[0032] Reference Figure 1As shown, this application embodiment provides a nylon rod pin with an expandable diameter, including a nylon rod body 1, with a through hole 11 at the axial center of the nylon rod body 1, the through hole 11 providing a channel for a high-strength countersunk bolt 2 to achieve axial pre-tightening; the high-strength countersunk bolt 2 includes a countersunk end 21 and a threaded portion 22, the diameter of the countersunk end 21 being larger than the diameter of the through hole 11 and embedded in a countersunk hole 12 at one end of the nylon rod body 1, the high strength countersunk head preventing the bolt head from protruding outwards, the threaded portion 22 passing through the through hole 11; and a countersunk nut 3, the countersunk nut 3 including a countersunk groove 31, the countersunk nut 3 being threadedly connected to the end of the threaded portion 22; the outer surface of the end of the countersunk nut 3 is coplanar with the end face of the nylon rod body 1 away from the high-strength countersunk bolt 2, ensuring a flat connection.

[0033] This application provides an expandable nylon rod pin. By tightening the countersunk nut 3, the axial pressure causes the nylon rod body 1 to expand radially along the through hole 11, achieving active adjustment of the nylon rod pin diameter. The countersunk end 21 is embedded in the countersunk hole 12 at one end of the nylon rod body 1. The design of the end of the countersunk nut 3 being coplanar with the end face of the nylon rod body 1 ensures a flat and unprotruding connection interface, avoiding motion interference, and also provides bidirectional axial limiting to prevent the high-strength countersunk bolt 2 and countersunk nut 3 from shifting during transmission. The preload of the high-strength countersunk bolt 2 and countersunk nut, combined with the elastic deformation characteristics of the nylon material, forms a self-locking effect, maintaining a tight state even under high-frequency vibration conditions, reducing maintenance frequency.

[0034] Reference Figure 1 As shown in the figure, in some embodiments, the diameter of the through hole 11 is 1 / 2 of the diameter of the nylon rod body 1, ensuring the wall thickness strength of the nylon rod body 1 while allowing the high-strength countersunk bolt 2 to pass through smoothly.

[0035] The diameter of the through hole 11 is half the diameter of the nylon rod body 1, ensuring that the nylon rod body 1 has sufficient wall thickness and strength to withstand various stresses and loads encountered in the working environment, thus guaranteeing the stability and durability of the overall structure. The through hole 11 also allows the high-strength countersunk bolt 2 to pass through smoothly and without obstruction, facilitating installation and disassembly.

[0036] Reference Figures 1-3 As shown, in some embodiments, the diameter of the high-strength countersunk bolt 2 is smaller than the diameter of the through hole 11, leaving an expansion gap so that the nylon rod body 1 expands radially under pressure.

[0037] The gap between the high-strength countersunk bolt 2 and the through hole 11 provides deformation space for the radial expansion of the nylon rod body 1 under pressure. When the countersunk nut 3 is tightened, the axial pressure forces the nylon rod body 1 to expand outward, realizing the active adjustment of the nylon rod pin diameter. The existence of the gap avoids direct rigid contact between the high-strength countersunk bolt 2 and the nylon rod body 1, so that the expansion stress is evenly distributed in the thick area of ​​the nylon rod wall, preventing local stress concentration.

[0038] Reference Figure 1 As shown, in some embodiments, the diameter of the countersunk end 21 of the high-strength countersunk bolt 2 is 2 / 3 of the diameter of the nylon rod body 1, and the diameter of the threaded portion 22 of the high-strength countersunk bolt 2 is 7 / 15 of the diameter of the nylon rod body 1.

[0039] The countersunk end 21 has a diameter of 2 / 3 of the diameter of the nylon rod body 1, creating a gradient strength distribution between the remaining wall thickness of the nylon rod body 1 and the wall thickness of the through hole 11. This reduces stress abrupt changes and extends the fatigue life of the nylon rod body 1. The diameter of the screw portion 22 is 7 / 15 of the diameter of the nylon rod body. This design considers both ensuring sufficient contact area between the bolt and the nylon rod body for a secure connection and ensuring that the entire assembly can effectively expand after tightening. This approach not only enhances the stability and reliability of the overall structure but also effectively reduces the load on the mechanical system at startup, thereby reducing potential mechanical stress and wear.

[0040] Reference Figure 3 As shown, in some embodiments, the high-strength countersunk bolt 2 has a hexagonal hole in the countersunk end 21, which allows for quick installation / removal of the bolt using an adapter.

[0041] By using hexagonal holes and standard tools, the installation and removal process of high-strength countersunk bolts can be significantly accelerated, maintenance time can be reduced, work efficiency can be improved, and wear on the bolt heads can be reduced, extending their service life and maintaining good mechanical properties.

[0042] Reference Figure 1 and Figure 3 As shown, in some embodiments, a disc spring 32 is provided between the countersunk nut 3 and the nylon rod body 1. The disc spring 32 is sleeved on the screw part 22, and the preload of the disc spring 32 can compensate for loosening caused by vibration.

[0043] The inner diameter of the disc spring 32 is slightly larger than the diameter of the screw portion 22, and the outer diameter is smaller than the diameter of the nylon rod body 1. When vibration or temperature changes cause slight deformation of the nylon rod body 1, the disc spring 32 elastically deforms to release or absorb energy, maintaining the stability of the preload of the high-strength countersunk bolt 2 and the countersunk nut 3. The preload of the disc spring 32 continuously counteracts the axial relaxation caused by vibration, preventing the countersunk nut 3 from rotating in the opposite direction and loosening. The disc spring 32 disperses the concentrated stress between the high-strength countersunk bolt 2 and the nylon rod body 1, reducing the risk of material fatigue. A disc spring 32 is provided between the countersunk nut 3 and the nylon rod body 1, and its compression stroke is adapted to the expansion deformation of the nylon rod body 1 to counteract the axial relaxation caused by vibration.

[0044] Reference Figure 2 As shown, in some embodiments, the outer surface of the nylon rod body 1 is provided with an elastic buffer layer 13 to absorb impact and reduce friction noise.

[0045] The elastic buffer layer 13 absorbs the instantaneous impact energy during the start-up, shutdown, or sudden load changes of the coupling through compression deformation, reducing the internal stress of the nylon rod body 1. As a soft medium, the elastic buffer layer 13 also reduces wear on the nylon rod body 1.

[0046] Reference Figure 1 and Figure 3 As shown, in some embodiments, the inner wall of the countersunk groove 31 of the countersunk nut 3 is provided with an annular self-locking groove 33, and the end of the screw portion 22 is provided with a radial elastic protrusion 34 to achieve mechanical engagement and prevent the nut from loosening.

[0047] The annular self-locking groove 33 has a width slightly larger than the diameter of the radial elastic protrusion 34. When the countersunk nut 3 is tightened, the radial elastic protrusion 34 is temporarily compressed by the inner wall of the annular self-locking groove 33. When the radial elastic protrusion 34 reaches the position of the annular self-locking groove 33, it elastically returns to its original position and embeds itself into the groove to form a mechanical engagement. When the countersunk nut 3 is rotated in the opposite direction, the radial elastic protrusion 34 generates resistance with the side wall of the annular self-locking groove 33, requiring additional torque to unlock, thus achieving the anti-loosening effect.

[0048] Reference Figures 1-5 As shown, this application embodiment provides a nylon rod pin coupling, including a nylon rod pin; a coupling assembly 4, the coupling assembly 4 having an annular array of coupling connection holes 40; the nylon rod pin passing through the coupling connection holes 40; absorbing transmission impact through elastic deformation to reduce noise, while using interference expansion to adapt to the coupling connection holes 40;

[0049] The baffle assembly 5 is fixed to the outer end face of the wheel assembly 4 by fasteners to restrict the axial displacement of the nylon rod pin and prevent it from falling off.

[0050] Insert the nylon rod pin into the coupling hole 40 of the coupling assembly 4 to align the first half coupling 41 and the second half coupling 42; install the baffle assembly 5 to limit the axial displacement of the nylon rod pin and prevent it from falling off; the nylon rod pin can be replaced individually without disassembling the coupling body, thus shortening maintenance time.

[0051] Reference Figure 4 and Figure 5 As shown, in some embodiments, the coupling assembly 4 is formed by the mating of a symmetrically arranged first half-coupling 41 and a second half-coupling 42, with the coupling connecting holes 40 evenly distributed circumferentially on the mating surface.

[0052] The baffle assembly 5 includes a nylon rod baffle 51 and circumferentially distributed fastening bolts 52. The fastening bolts 52 pass through the nylon rod baffle 51 and are threadedly connected to the first half-coupling 41 and the second half-coupling 42.

[0053] The split coupling assembly 4 allows for disassembly and installation on-site, solving the problem of hoisting large couplings as a whole and reducing assembly time; if a single half coupling (41 or 42) is damaged, it can be replaced individually without scrapping the entire coupling assembly 4, thus saving costs.

[0054] Based on the aforementioned technical features, the working principle of the diameter-expandable nylon rod pin provided in this application in practical application scenarios is as follows:

[0055] By passing the high-strength countersunk bolt 2 through the axial through hole on the nylon rod body 1 and fixing it with the countersunk nut 3, the nylon rod body can expand after fixing, thus tightly fitting with the coupling hole 40, thereby reducing the instantaneous starting load. By tightening the countersunk nut 3, axial pressure is transmitted to the nylon rod body 1, forcing the nylon rod body 1 to expand radially along the through hole 11. The expansion amount can be precisely controlled by the torque of the high-strength countersunk adjusting nut to adapt to coupling holes 40 with different tolerances. The diameter of the high-strength countersunk bolt 2 is smaller than the diameter of the through hole 11, providing deformation space for expansion while avoiding stress concentration caused by rigid contact. The disc spring 32 provides dynamic compensation, and the spring preload counteracts the axial relaxation caused by vibration in real time. The annular self-locking groove 33 of the countersunk nut countersunk groove 31 engages with the radial elastic protrusion 34 at the end of the screw part 22, requiring torque for disassembly. The elastic buffer layer 13 absorbs instantaneous impact through compression deformation and reduces transmission noise.

[0056] Insert the nylon rod pin into the connecting hole 40 of the coupling assembly 4, align the first half coupling 41 and the second half coupling 42, install the nylon rod baffle 51, and tighten the circumferentially distributed M12 fastening bolts 52 in a diagonal sequence to restrict the axial displacement of the nylon rod pin. Tighten the countersunk nut 3 with an Allen wrench to trigger the radial expansion of the nylon rod, forming an interference fit with the coupling hole 40.

[0057] It is readily understood that, based on the several embodiments provided in this application, those skilled in the art can combine, split, or reorganize the embodiments of this application to obtain other embodiments, none of which exceed the protection scope of this application.

[0058] The above detailed embodiments further illustrate the purpose, technical solution, and beneficial effects of the embodiments of this application. It should be understood that the above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solutions of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A nylon rod pin with an expandable diameter, characterized in that, include: Nylon rod body (1), wherein the nylon rod body (1) has a through hole (11) at its axial center; High-strength countersunk bolt (2), the high-strength countersunk bolt (2) includes a countersunk end (21) and a screw part (22), the diameter of the countersunk end (21) is larger than the diameter of the through hole (11) and is embedded in the countersunk hole (12) at one end of the nylon rod body (1), and the screw part (22) passes through the through hole (11); Countersunk nut (3), the countersunk nut (3) includes a countersunk groove (31), the countersunk nut (3) is threaded to the end of the screw part (22); the outer surface of the end of the countersunk nut (3) is coplanar with the end face of the nylon rod body (1) away from the high-strength countersunk bolt (2).

2. The nylon rod pin according to claim 1, characterized in that, The diameter of the through hole (11) is 1 / 2 of the diameter of the nylon rod body (1).

3. The nylon rod pin according to claim 1, characterized in that, The diameter of the high-strength countersunk bolt (2) is smaller than the diameter of the through hole (11).

4. The nylon rod pin according to claim 1, characterized in that: The countersunk end (21) of the high-strength countersunk bolt (2) has a diameter that is 2 / 3 of the diameter of the nylon rod body (1).

5. The nylon rod pin according to claim 4, characterized in that, The high-strength countersunk bolt (2) has a hexagonal hole inside the countersunk end (21).

6. The nylon rod pin according to claim 1, characterized in that, A disc spring (32) is provided between the countersunk nut (3) and the nylon rod body (1), and the disc spring (32) is sleeved on the screw part (22).

7. The nylon rod pin according to claim 1, characterized in that, The outer surface of the nylon rod body (1) is provided with an elastic buffer layer (13).

8. The nylon rod pin according to claim 1, characterized in that, The countersunk nut (3) has an annular self-locking groove (33) on the inner wall of the countersunk groove (31), and the screw part (22) has a radial elastic protrusion (34) at the end.

9. A nylon rod pin coupling, characterized in that, Includes the nylon rod pin as described in any one of claims 1-8; The coupling assembly (4) is provided with a ring array of coupling connection holes (40); the nylon rod pin passes through the coupling connection holes (40); Baffle assembly (5) is fixed to the outer end face of the wheel assembly (4) by fasteners.

10. The coupling according to claim 9, characterized in that, The coupling assembly (4) is formed by the engagement of a first half-coupling (41) and a second half-coupling (42) arranged symmetrically, with the coupling connecting holes (40) evenly distributed circumferentially on the engagement surface; The baffle assembly (5) includes a nylon rod baffle (51) and circumferentially distributed fastening bolts (52), the fastening bolts (52) passing through the nylon rod baffle (51) and threadedly connected to the first half coupling (41) and the second half coupling (42).

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