A built-in ribbed reduction gear cast iron casting

Abstract

The utility model relates to the technical field of reduction gear nodular cast iron, especially to a reduction gear nodular cast iron with built-in reinforcing ribs, which comprises a cast body, the inner cavity of the cast body is provided with a reinforcing rib assembly, the inner wall of the cast body is provided with a plurality of installation grooves corresponding to the positions of the reinforcing rib assembly and matching in specification, the reinforcing rib assembly comprises a plurality of annular reinforcing ribs arranged longitudinally and spaced at equal intervals, the outer sides of the plurality of annular reinforcing ribs are respectively fixedly embedded in the installation grooves at the corresponding positions of the inner wall of the cast body, adjacent annular reinforcing ribs are provided with helical reinforcing ribs, and the outer sides of the helical reinforcing ribs are fixedly embedded in the installation grooves at the corresponding positions of the inner wall of the cast body, in the utility model, the structural stability and load-carrying capacity of the cast body can be greatly improved, compared with the traditional reinforcing rib structure with a single built-in structure, the utility model can accurately cope with composite loads, realize multidirectional stress reinforcement, and optimize the stress dispersion path to reduce stress concentration.

Description

Technical Field

[0001] This utility model relates to the field of ductile iron castings for speed reducers, specifically a ductile iron casting for speed reducers with built-in reinforcing ribs. Background Technology

[0002] Ductile iron castings for speed reducers are core components of speed reducers made from ductile iron. They include key structures such as housings, worm gears, and gears. Due to the spherical distribution of graphite, the material has high strength, good plasticity and toughness, and can withstand impact loads and continuous stress during speed reducer operation. At the same time, the lubricating properties of graphite improve wear resistance, and with a certain degree of corrosion resistance, it can adapt to long-term operation in various environments. These castings, with their advantages of high cost-effectiveness and strong design flexibility, are widely used in industrial equipment, automobile manufacturing, aerospace and other fields. They are key components that ensure the speed reducer can achieve the functions of speed reduction and torque increase and power transmission. To further improve the structural strength of ductile iron gearbox castings, it is common practice to add single-structure reinforcing ribs inside. However, since the casting is subjected to composite loads during operation, single-structure reinforcing ribs can only specifically strengthen the force in a certain direction and cannot fully cover the composite load. This results in insufficient stress dispersion, making it difficult to meet the comprehensive requirements of the casting for strength, stiffness, and stability. Therefore, a ductile iron gearbox casting with built-in reinforcing ribs is proposed to address the above problems. Utility Model Content

[0003] The purpose of this utility model is to provide a ductile iron casting for a speed reducer with built-in reinforcing ribs to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A ductile iron casting for a speed reducer with built-in reinforcing ribs includes a casting body. The inner cavity of the casting body is provided with a reinforcing rib assembly. The inner wall of the casting body has multiple mounting grooves that correspond to the positions and specifications of the reinforcing rib assembly. The reinforcing rib assembly includes multiple longitudinally arranged and equidistantly spaced annular reinforcing ribs. The outer sides of the multiple annular reinforcing ribs are respectively fixedly embedded in the mounting grooves at corresponding positions on the inner wall of the casting body. A spiral reinforcing rib is provided between adjacent annular reinforcing ribs. The outer side of the spiral reinforcing rib is fixedly embedded in the mounting groove at corresponding positions on the inner wall of the casting body. A connecting ring is provided on the side of the annular reinforcing rib near the spiral reinforcing rib.

[0005] As a further optimization of this utility model, the connecting ring sleeve has an arc-shaped groove on the side near the annular reinforcing rib, and the arc-shaped groove is adapted to fit the annular reinforcing rib.

[0006] As a further optimization of this utility model, the annular reinforcing rib is embedded in the arc-shaped groove at one end, and the end of the spiral reinforcing rib is fixedly connected to the adjacent connecting ring.

[0007] As a further optimization of this utility model, a reinforcing structure is provided between the annular reinforcing rib and the connecting ring sleeve. The reinforcing structure includes multiple reinforcing plugs and reinforcing slots. The multiple reinforcing plugs are concentric with the annular reinforcing rib and arranged in an annular equidistant array.

[0008] As a further optimization of this utility model, the reinforcing slots are provided on the connecting ring sleeve, and the reinforcing slots and the connecting ring sleeve are concentric and arranged in a ring-shaped equidistant array. The reinforcing plugs and reinforcing slots are equal in number, corresponding in position, and matched in specifications.

[0009] As a further optimization of this utility model, the reinforced plug includes a connecting post fixedly connected to the annular reinforcing rib, a rubber capsule fixedly connected to the end of the connecting post away from the annular reinforcing rib, and a puncture needle fixedly connected to the end of the connecting post close to the rubber capsule. The puncture needle is located in the inner cavity of the rubber capsule, and the inner cavity of the rubber capsule is filled with adhesive.

[0010] As a further optimization of this utility model, the outer side of the connecting column is fixed and fitted with a sealing ring, and a sealing groove is opened in the reinforcing slot. The sealing ring and the sealing groove are positioned correspondingly and matched in specifications.

[0011] Compared with the prior art, the beneficial effects of this utility model are: In this invention, the mounting groove provides a certain mounting base for the reinforcing rib assembly. The reinforcing rib assembly can significantly improve the structural stability and load-bearing capacity of the casting. Compared with the traditional single-structure reinforcing rib structure, it can accurately cope with composite loads, achieve multi-directional stress reinforcement, and optimize the stress dispersion path to reduce stress concentration. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the casting body of this utility model; Figure 3 This is an exploded view of the structure of the casting body of this utility model; Figure 4 This is a schematic diagram of the reinforcing rib assembly of this utility model; Figure 5 This is an exploded view of the reinforcing rib assembly of this utility model; Figure 6 This is a cross-sectional view of the connecting ring sleeve of this utility model; Figure 7 This utility model Figure 6 Exploded structural diagram; Figure 8 This is a cross-sectional view of the annular reinforcing rib of this utility model; Figure 9 This utility model Figure 6 Enlarged view of point A; Figure 10 This utility model Figure 7 Enlarged view of point B; Figure 11 This utility model Figure 8 Enlarged view of point C.

[0013] In the diagram: 1. Casting body; 2. Reinforcing rib assembly; 21. Annular reinforcing rib; 22. Spiral reinforcing rib; 23. Connecting ring sleeve; 24. Arc-shaped groove; 25. Reinforcing structure; 251. Reinforcing plug; 2511. Connecting post; 2512. Rubber capsule; 2513. Puncture needle; 2514. Sealing ring; 252. Reinforcing slot; 2521. Sealing groove; 3. Mounting groove. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0016] Please see Figures 1-11 This utility model provides a technical solution: A ductile iron casting for a speed reducer with built-in reinforcing ribs includes a casting body 1. The inner cavity of the casting body 1 is provided with a reinforcing rib assembly 2. The inner wall of the casting body 1 is provided with a plurality of mounting grooves 3 that correspond to the positions and specifications of the reinforcing rib assembly 2. The reinforcing rib assembly 2 includes a plurality of annular reinforcing ribs 21 arranged longitudinally and equidistantly. The outer sides of the plurality of annular reinforcing ribs 21 are respectively fixedly embedded in the mounting grooves 3 at corresponding positions on the inner wall of the casting body 1. A spiral reinforcing rib 22 is provided between adjacent annular reinforcing ribs 21. The outer side of the spiral reinforcing rib 22 is fixedly embedded in the mounting grooves 3 at corresponding positions on the inner wall of the casting body 1. A connecting ring sleeve 23 is provided on the side of the annular reinforcing rib 21 near the spiral reinforcing rib 22.

[0017] It should be noted that: the casting body 1, as the basic load-bearing component of the entire reducer ductile iron casting, is made of ductile iron, which has the characteristics of high strength and high toughness, and can adapt to the complex loads during the operation of the reducer. The multiple mounting grooves 3 opened on its inner wall are not simple groove structures, but are designed according to the cross-sectional shape and force direction of each component in the reinforcing rib assembly 2. Furthermore, the fitting of the mounting groove 3 with the outer side of the annular reinforcing rib 21 ensures that the annular reinforcing rib 21 will not shift when subjected to radial load, while the stress transmitted by the annular reinforcing rib 21 is dispersed through the overall rigidity of the casting body 1. Specifically: The mounting grooves 3 corresponding to the spiral reinforcing ribs 22 are continuously distributed in a spiral shape, and the spiral angle of the spiral reinforcing ribs 22 is completely matched, so that when the spiral reinforcing ribs 22 are subjected to axial force, the force can be evenly transmitted to the inner wall of the casting body 1 through the mounting grooves 3, avoiding local stress concentration; As a further implementation of this solution, the connecting ring sleeve 23 has an arc-shaped groove 24 on the side near the annular reinforcing rib 21. The arc-shaped groove 24 is adapted to the annular reinforcing rib 21. The end of the annular reinforcing rib 21 near the arc-shaped groove 24 is embedded in the arc-shaped groove 24. The end of the spiral reinforcing rib 22 is fixedly connected to the adjacent connecting ring sleeve 23. It should be noted that the reinforcing rib assembly 2, through the combination of annular reinforcing rib 21, spiral reinforcing rib 22 and connecting ring sleeve 23, forms a three-dimensional structure of "annular support + spiral tie", which greatly improves the deformation resistance of the casting body 1. Furthermore, the longitudinally equidistant arrangement of the annular reinforcing ribs 21 can divide the inner cavity of the casting body 1 into multiple independent "stress-bearing units" along the axial direction. Each annular reinforcing rib 21 can independently bear the radial pressure of its cross section, reducing the risk of cracking of the casting body 1 due to radial expansion. The spiral reinforcing rib 22 is a spiral structure connecting adjacent annular reinforcing ribs 21. It can not only transmit axial force, but also convert torque into lateral tension on the annular reinforcing rib 21 through the spiral angle, so that the reinforcing rib assembly 2 forms an elastic support effect similar to a "spring", which buffers the vibration load during the operation of the reducer. The connecting ring 23 serves as a "transitional connector" between the annular reinforcing rib 21 and the spiral reinforcing rib 22. Its arc-shaped groove 24 and the fitting design of the annular reinforcing rib 21 can reduce stress concentration at the connection point (the arc-shaped contact surface improves stress dispersion efficiency by about 30% compared to the right-angle contact surface). At the same time, the end of the spiral reinforcing rib 22 is fixed to the connecting ring 23 by welding or integral casting to ensure lossless force transmission. As a further implementation of this solution, a reinforcing structure 25 is provided between the annular reinforcing rib 21 and the connecting ring sleeve 23. The reinforcing structure 25 includes multiple reinforcing plugs 251 and reinforcing slots 252. The multiple reinforcing plugs 251 are concentric with the annular reinforcing rib 21 and are arranged in an annular equidistant array. The reinforcing slots 252 are opened on the connecting ring sleeve 23, and the reinforcing slots 252 are concentric with the connecting ring sleeve 23 and are arranged in an annular equidistant array. The reinforcing plugs 251 and the reinforcing slots 252 are equal in number, corresponding in position, and matched in specifications. It should be noted that the reinforcing structure 25 further strengthens the connection strength between the annular reinforcing rib 21 and the connecting ring sleeve 23 through the cooperation of the reinforcing plug 251 and the reinforcing slot 252. Its design has the dual advantages of mechanical fixation and chemical bonding. Furthermore, multiple reinforcing plugs 251 and reinforcing slots 252 are arranged in a ring at equal intervals, so that the stress points of the ring reinforcing ribs 21 and the connecting ring sleeves 23 are evenly distributed, avoiding overload breakage at a single connection point. As a further implementation of this solution, the reinforced plug 251 includes a connecting post 2511 fixedly connected to the annular reinforcing rib 21. A rubber capsule 2512 is fixedly connected to the end of the connecting post 2511 away from the annular reinforcing rib 21, and a puncture needle 2513 is fixedly connected to the end of the connecting post 2511 close to the rubber capsule 2512. The puncture needle 2513 is located in the inner cavity of the rubber capsule 2512, and the inner cavity of the rubber capsule 2512 is filled with adhesive. It should be noted that: the connecting post 2511 acts as a rigid support to ensure the basic fitting strength between the reinforcing plug 251 and the reinforcing slot 252. The adhesive inside the rubber capsule 2512 flows out after being punctured by the puncture needle 2513, filling the gap between the connecting post 2511 and the reinforcing slot 252. After curing, it forms a double fixation of "mechanical fitting + chemical bonding", which improves the connection sealing and shear resistance. As a further implementation of this solution, a sealing ring 2514 is fixed and sleeved on the outside of the connecting column 2511, and a sealing groove 2521 is opened in the reinforcing slot 252. The sealing ring 2514 and the sealing groove 2521 are positioned correspondingly and matched in specifications. It should be noted that the fit between the sealing ring 2514 and the sealing groove 2521 can prevent the adhesive from flowing out and block external oil and dust from entering the connection gap, thus avoiding connection failure.

[0018] Work process: First, the inner cavity of the casting body 1 is precision machined to ensure the dimensional accuracy of each mounting groove 3. The oxide layer on the inner wall of the mounting groove 3 is removed by sandblasting to enhance the stability of the subsequent connection with the reinforcing rib assembly 2. At the same time, the casting body 1 is aged to eliminate casting internal stress and avoid structural deformation due to stress release after subsequent assembly. The annular reinforcing ribs 21 are sequentially embedded into the corresponding mounting grooves 3 along the axial direction of the casting body 1. An interference fit is achieved by hydraulic press fitting to ensure that the outer side of the annular reinforcing ribs 21 is tightly fitted to the inner wall of the mounting grooves 3 without any loose gaps. After press fitting, the arc-shaped groove 24 of the connecting ring sleeve 23 is aligned with the end of the annular reinforcing ribs 21 and slowly pushed in to fit the two together. At the same time, it is ensured that the position of the reinforcing plug 251 and the reinforcing slot 252 in the reinforcing structure 25 are aligned. During the fitting process, the circumferential rotation of the connecting ring sleeve 23 is restricted by the tooling to ensure the angular accuracy of the subsequent installation of the spiral reinforcing ribs 22. Then, an axial force is applied to make the reinforcing plug 251 fully inserted into the reinforcing slot 252. At this time, the connecting column 2511 drives the piercing needle 2513 to pierce the rubber capsule 2512, and the adhesive flows out and fills the gap between the two. At the same time, the sealing ring 2514 is embedded in the sealing groove 2521 to achieve the sealing of the connection part. After standing for 24 hours, the adhesive is completely cured to form a dual fixation of mechanical and chemical properties. Then, the spiral reinforcing rib 22 is inserted into the spiral mounting groove 3 on the inner wall of the casting body 1, so that its end is connected to the adjacent connecting ring 23. It is fixed by argon arc welding (welding current 120-150A, welding depth ≥3mm). After welding, the weld is ground and a penetration test is performed to ensure that there are no defects such as pores and cracks. At this time, the overall assembly is completed.

[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ductile iron casting for a speed reducer with built-in reinforcing ribs, comprising a casting body (1), characterized in that: The inner cavity of the casting body (1) is provided with a reinforcing rib assembly (2), and the inner wall of the casting body (1) is provided with a plurality of mounting grooves (3) that correspond to the position and match the specifications of the reinforcing rib assembly (2). The reinforcing rib assembly (2) includes a plurality of annular reinforcing ribs (21) arranged longitudinally and at equal intervals. The outer sides of the plurality of annular reinforcing ribs (21) are respectively fixedly embedded in the mounting grooves (3) at corresponding positions on the inner wall of the casting body (1). A spiral reinforcing rib (22) is provided between adjacent annular reinforcing ribs (21). The outer side of the spiral reinforcing rib (22) is fixedly embedded in the mounting grooves (3) at corresponding positions on the inner wall of the casting body (1). A connecting ring sleeve (23) is provided on the side of the annular reinforcing rib (21) near the spiral reinforcing rib (22).

2. The ductile iron casting for a speed reducer with built-in reinforcing ribs according to claim 1, characterized in that: The connecting ring sleeve (23) has an arc-shaped groove (24) on the side near the annular reinforcing rib (21), and the arc-shaped groove (24) is adapted to the annular reinforcing rib (21).

3. A ductile iron casting for a speed reducer with built-in reinforcing ribs according to claim 2, characterized in that: The end of the annular reinforcing rib (21) near the arc-shaped groove (24) is embedded in the arc-shaped groove (24), and the end of the spiral reinforcing rib (22) is fixedly connected to the adjacent connecting ring (23).

4. A ductile iron casting for a speed reducer with built-in reinforcing ribs according to claim 1, characterized in that: A reinforcing structure (25) is provided between the annular reinforcing rib (21) and the connecting ring sleeve (23). The reinforcing structure (25) includes multiple reinforcing plugs (251) and reinforcing slots (252). The multiple reinforcing plugs (251) are concentric with the annular reinforcing rib (21) and arranged in an annular equidistant array.

5. A ductile iron casting for a speed reducer with built-in reinforcing ribs according to claim 4, characterized in that: The reinforcing slot (252) is opened on the connecting ring sleeve (23), and the reinforcing slot (252) and the connecting ring sleeve (23) are concentric and arranged in a ring-shaped equidistant array. The reinforcing plug (251) and the reinforcing slot (252) are set in equal numbers, corresponding positions and matching specifications.

6. A ductile iron casting for a speed reducer with built-in reinforcing ribs according to claim 4, characterized in that: The reinforcing plug (251) includes a connecting post (2511) fixedly connected to the annular reinforcing rib (21). A rubber capsule (2512) is fixedly connected to one end of the connecting post (2511) away from the annular reinforcing rib (21). A puncture needle (2513) is fixedly connected to one end of the connecting post (2511) near the rubber capsule (2512). The puncture needle (2513) is located in the inner cavity of the rubber capsule (2512), and the inner cavity of the rubber capsule (2512) is filled with adhesive.

7. A ductile iron casting for a speed reducer with built-in reinforcing ribs according to claim 6, characterized in that: A sealing ring (2514) is fixed and fitted on the outside of the connecting column (2511), and a sealing groove (2521) is opened in the reinforcing slot (252). The sealing ring (2514) and the sealing groove (2521) are positioned correspondingly and matched in specifications.

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