Manufacturing method of multi-material combined gear and combined gear

Abstract

The invention discloses a manufacturing method of a multi-material combined type gear and a combined gear, and the manufacturing method of the multi-material combined type gear comprises the steps that a base body is manufactured, specifically, the base body is manufactured through a first material, and the base body is provided with a mounting part; the tooth part is manufactured through a second material, the hardness of the second material is larger than that of the first material, the tooth part is provided with a matching part, and teeth are arranged on the periphery of the tooth part; and assembling and fixing: after the base body and the tooth part are prepared, the matching part sleeves the mounting part and is in interference fit with the mounting part so as to fix the tooth part and the base body. The gear is divided into the tooth part and the base body and is made of different materials, the problem that a gear of a multi-step structure is difficult to form is solved, meanwhile, the mechanical performance of all the parts of the gear is optimized, the requirement for complex structural design of the gear is met through the combined design, the hardness and abrasion resistance of the tooth part are improved, and the service life of the gear is prolonged. And the stability and the reliability of the whole structure are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of gear manufacturing, and in particular to a manufacturing method of a multi-material combined gear, and a combined gear manufactured using the manufacturing method of the multi-material combined gear. Background Art

[0002] In mechanical transmission systems, gears are widely used as key transmission components in various industrial equipment and mechanical devices. With the development of industrial technology, the performance requirements for gears are getting higher and higher, especially the durability and reliability in complex working environments. Powder metallurgy technology has been widely used in the field of gear manufacturing because it can efficiently produce parts with complex shapes, has high material utilization and relatively low cost.

[0003] However, there are some limitations to the conventional powder metallurgy pressing process. First, when it comes to gears with multiple steps, existing technologies can usually only achieve a maximum of five steps (e.g., two upward steps plus three downward steps) in the pressing process. This limitation is due to the complexity of the mold design and the problems that may arise during the powder filling and compaction process. For gears that require six or more steps, it is difficult to achieve the desired effect using the conventional single-shot pressing method, which greatly limits the ability to manufacture complex gears through powder metallurgy technology.

[0004] Secondly, different parts of the gear have different requirements for its mechanical properties. Specifically, the tooth part, as the part directly involved in meshing and power transmission, needs to have high hardness and wear resistance to ensure long-term stable operation; while the matrix part mainly plays a supporting role and has relatively low requirements for material performance. However, in the existing powder metallurgy one-time pressing process, the entire gear must be pressed with the same material, which obviously cannot simultaneously meet the optimal material selection for both the tooth part and the matrix. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a method for manufacturing a multi-material combined gear, which divides the gear into two parts, a tooth portion and a base, and manufactures the gear using different materials, thereby solving the problem that multi-step structure gears are difficult to form, while optimizing the mechanical properties of each part of the gear. This combined design not only meets the requirements of complex gear structure design, but also improves the hardness and wear resistance of the tooth portion, enhances the stability and reliability of the overall structure, and provides a more efficient and economical solution for industrial applications.

[0006] The present invention also proposes a combined gear manufactured using the above-mentioned method for manufacturing a multi-material combined gear.

[0007] A method for manufacturing a multi-material combined gear according to the present invention comprises the following steps: Preparing a substrate: using a first material to manufacture a substrate, wherein the substrate is provided with a mounting portion; Preparing the tooth portion: using a second material to manufacture the tooth portion, the hardness of the second material is greater than the hardness of the first material, the tooth portion is provided with a matching portion, and the outer periphery of the tooth portion is provided with teeth; Assembly and fixation: After the base and the tooth portion are prepared, the matching portion is sleeved on the mounting portion and interference fits with the mounting portion to fix the tooth portion and the base.

[0008] A manufacturing method for a multi-material combination gear according to the present invention has at least the following beneficial effects: by decomposing the gear into two parts, a tooth portion and a matrix, and manufacturing them respectively with different materials, the technical difficulties encountered by traditional powder metallurgy processes in dealing with multi-step complex structures are effectively solved. This method allows the tooth portion to use a second material with higher hardness and wear resistance to meet its high requirements for mechanical properties during the transmission process, while the matrix can use a lower-cost first material, thereby reducing production costs while ensuring overall performance; in addition, by designing a reasonable interference fit, the connection between the tooth portion and the matrix is ​​made more firm and reliable, which not only enhances the overall strength of the gear, but also improves its stability and durability in actual work; overall, this innovative manufacturing method not only expands the application scope of powder metallurgy technology, but also provides a feasible solution for achieving the differentiation of material properties of different parts of the gear, thereby promoting technological progress and development in related fields.

[0009] According to a method for manufacturing a multi-material combination gear described in some embodiments of the present invention, the mounting portion is cylindrical, the mating portion is provided with a mounting hole matching the shape of the mounting portion, and the mounting hole is interference fit with the mounting portion.

[0010] According to a method for manufacturing a multi-material combination gear described in some embodiments of the present invention, the first material is at least one of iron, carbon and copper.

[0011] According to a method for manufacturing a multi-material combined gear described in some embodiments of the present invention, the second material is an alloy material.

[0012] According to a method for manufacturing a multi-material combined gear described in some embodiments of the present invention, the second material is a combination of at least two of iron, carbon, copper, nickel and molybdenum.

[0013] According to a method for manufacturing a multi-material combined gear described in some embodiments of the present invention, after assembly and fixation, the fixed tooth portion and the base have at least 6 step structures.

[0014] According to a method for manufacturing a multi-material combined gear described in some embodiments of the present invention, the thickness of the mounting portion is different from the thickness of the mating portion, so as to form at least one step structure after assembly and fixation.

[0015] According to a method for manufacturing a multi-material combined gear described in some embodiments of the present invention, in preparing a base body, the base body is manufactured and formed by a sintering process.

[0016] According to a method for manufacturing a multi-material combined gear described in some embodiments of the present invention, in preparing the tooth portion, the tooth portion is manufactured using a sintering process.

[0017] The combined gear according to the present invention includes a method for manufacturing a multi-material combined gear according to the present invention.

[0018] The combined gear according to the present invention has at least the following beneficial effects: by manufacturing the tooth portion and the matrix using different materials respectively and assembling them together by interference fit, it not only overcomes the technical bottleneck of traditional powder metallurgy process in dealing with multi-step complex structures, but also significantly improves the overall performance of the gear; specifically, since the tooth portion adopts alloy materials with higher hardness and stronger wear resistance, such as iron-carbon-copper-nickel-molybdenum alloy powder, the gear can withstand greater loads during the transmission process, reduce wear and extend the service life; and the matrix portion uses materials with lower cost but sufficient to meet the support requirements, such as iron-carbon-copper alloy, thereby achieving cost optimization while ensuring performance. Such a material selection strategy not only improves the working efficiency of the gear, but also enhances its economy and market competitiveness; in addition, the reasonably designed interference fit method enhances the connection firmness between the tooth portion and the matrix, ensuring the gear in Stability and reliability during operation; in addition, the interference fit can effectively transmit torque and prevent relative sliding or separation between the tooth and the base, which is particularly important under high load or vibration environments. This reliable connection method reduces maintenance requirements and reduces failure rates, thereby improving the overall availability and safety of the equipment; the successful implementation of this combined gear not only broadens the application scope of powder metallurgy technology, but also provides an effective solution to solve the different requirements of various parts of the gear for mechanical properties, especially for various industrial equipment and mechanical devices that require high-performance transmission systems. This gear can provide higher load-bearing capacity, better wear resistance and longer service life. Therefore, it is particularly suitable for key transmission components in the fields of automobiles, aerospace, heavy machinery, etc., representing an important advancement and development direction of gear manufacturing technology, and bringing significant technical advantages and economic benefits to related industries.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 A schematic flow chart of a method for manufacturing a multi-material combined gear according to an embodiment of the present invention; Figure 2 A cross-sectional view of a base body of a method for manufacturing a multi-material combined gear according to an embodiment of the present invention; Figure 3 A cross-sectional view of a tooth portion of a method for manufacturing a multi-material combined gear according to an embodiment of the present invention; Figure 4 It is a cross-sectional view of a combined gear according to an embodiment of the present invention.

[0021] Description of Figure Numbers: Base body 100; mounting portion 110; Tooth portion 200; mating portion 210; tooth 220; Combined gear 300 ; first step 310 ; second step 320 ; third step 330 ; fourth step 340 ; fifth step 350 ; sixth step 360 . DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0026] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0027] In mechanical transmission systems, gears are widely used as key transmission components in various industrial equipment and mechanical devices. With the development of industrial technology, the performance requirements for gears are getting higher and higher, especially the durability and reliability in complex working environments. Powder metallurgy technology has been widely used in the field of gear manufacturing because it can efficiently produce parts with complex shapes, has high material utilization and relatively low cost.

[0028] However, there are some limitations to the conventional powder metallurgy pressing process. First, when it comes to gears with multiple steps, existing technologies can usually only achieve a maximum of five steps (e.g., two upward steps plus three downward steps) in the pressing process. This limitation is due to the complexity of the mold design and the problems that may arise during the powder filling and compaction process. For gears that require six or more steps, it is difficult to achieve the desired effect using the conventional single-shot pressing method, which greatly limits the ability to manufacture complex gears through powder metallurgy technology.

[0029] Secondly, different parts of the gear have different requirements for its mechanical properties. Specifically, the tooth part, as the part directly involved in meshing and power transmission, needs to have high hardness and wear resistance to ensure long-term stable operation; while the matrix part mainly plays a supporting role and has relatively low requirements for material performance. However, in the existing powder metallurgy one-time pressing process, the entire gear must be pressed with the same material, which obviously cannot simultaneously meet the optimal material selection for both the tooth part and the matrix.

[0030] For this reason, Figures 1 to 4 As shown, a method for manufacturing a multi-material combined gear proposed by the present invention comprises the following steps: S100, preparing a substrate 100: using a first material to manufacture the substrate 100, the substrate 100 is provided with a mounting portion 110; S200, preparing the tooth portion 200: using a second material to manufacture the tooth portion 200, the hardness of the second material is greater than the hardness of the first material, the tooth portion 200 is provided with a matching portion 210, and the outer periphery of the tooth portion 200 is provided with teeth 220; S300 , assembly and fixing: after the base 100 and the tooth portion 200 are prepared, the matching portion 210 is sleeved on the mounting portion 110 and is interference-fitted with the mounting portion 110 to fix the tooth portion 200 and the base 100 .

[0031] It should be noted that by decomposing the gear into two parts, the tooth portion 200 and the base 100, and manufacturing them with different materials respectively, the technical difficulties encountered by the traditional powder metallurgy process in dealing with multi-step complex structures are effectively solved. This method allows the tooth portion 200 to use a second material with higher hardness and wear resistance to meet its high requirements for mechanical properties during the transmission process, while the base 100 can use a first material with lower cost, thereby reducing production costs while ensuring overall performance; in addition, by designing a reasonable interference fit method, the connection between the tooth portion 200 and the base 100 is made more firm and reliable, which not only enhances the overall strength of the gear, but also improves its stability and durability in actual work; overall, this innovative manufacturing method not only expands the application scope of powder metallurgy technology, but also provides a feasible solution for realizing the differentiation of material properties of different parts of the gear, thereby promoting technological progress and development in related fields.

[0032] In some embodiments, the mounting portion 110 is a solid structure, the matching portion 210 has a hollow structure, and the matching portion 210 and the mounting portion 110 are designed in a profiling manner. For example, the mounting portion and the matching portion are both polygonal (not shown in the figure), such as a triangle, a square, a pentagon, etc. In some embodiments of the present invention, the mounting portion 110 and the matching portion 210 are both circular. Specifically, the mounting portion 110 is cylindrical, and the matching portion 210 is provided with a mounting hole matching the outer shape of the mounting portion 110, and the mounting hole is interference-fitted with the mounting portion 110. First, by designing the mounting portion 110 to be cylindrical and providing corresponding mounting holes in the matching portion 210, accurate alignment and tight connection between the tooth portion 200 and the base 100 can be ensured. Among them, the cylindrical mounting portion 110 provides a uniform contact surface, which helps to achieve smooth matching during the assembly process and reduces the assembly error caused by irregular shape, which not only simplifies the assembly process, but also improves the assembly accuracy and ensures the stability and consistency of the gear in actual work. It should be noted that interference fit is a common mechanical connection method, which achieves fastening by making the inner diameter of the mating portion 210 slightly smaller than the outer diameter of the mounting portion 110. Therefore, when the mating portion 210 is sleeved on the mounting portion 110, a certain compressive stress will be generated, thereby forming a strong mechanical connection. This method not only enhances the connection strength between the tooth portion 200 and the base 100, but also effectively prevents loosening caused by vibration or load changes during use. Therefore, the interference fit significantly improves the overall rigidity and durability of the gear, enabling it to withstand higher torque and harsher working conditions. In addition, the interference fit also helps to improve the sealing performance of the gear. In some applications, the gear may need to work in an environment where lubricants or other media are present. The interference fit can reduce the gap between the mating surfaces, thereby reducing the risk of lubricant leakage and improving the overall efficiency and reliability of the system. At the same time, this tight connection method also helps to reduce noise and vibration and improve user experience.

[0033] Optionally, the first material is at least one of iron, carbon and copper. It is easy to understand that iron, carbon and copper are all commonly used materials in powder metallurgy processes, and their performance in the sintering process is also very excellent. These materials are easy to sinter and form at high temperatures, and can form a uniform and dense microstructure, reduce internal defects and porosity, improve the density and mechanical properties of parts, and have good processing performance and cost-effectiveness. The wide application of these materials means that they are highly available in the supply chain, thereby reducing the cost and difficulty of raw material procurement. In addition, the mature processing technology of these materials makes the production process more controllable, which helps to improve manufacturing efficiency and consistency of product quality. Secondly, iron, carbon and copper and their alloys have excellent mechanical properties and can meet the basic requirements of the gear matrix 100. Iron is a common structural material with high strength and toughness, and is suitable for parts that bear large loads; carbon can enhance the hardness and wear resistance of the material; and copper provides good conductivity and corrosion resistance. By reasonably matching these elements, the mechanical properties of the matrix 100 can be adjusted according to the needs of actual applications, so that it has sufficient strength and rigidity, and maintains appropriate ductility and corrosion resistance. Furthermore, using iron, carbon and copper as the material of the matrix 100 can also optimize the cost structure of the entire gear. Compared with the high-performance alloy materials required for the tooth portion 200, these materials are relatively low in cost, but can still provide sufficient supporting performance. This differentiated material selection strategy not only ensures the overall performance of the gear, but also achieves effective cost control and enhances the market competitiveness of the product. This material selection is particularly important in mass production and cost-sensitive applications.

[0034] Correspondingly, the second material can be selected as a single material with better material properties than the first material. In some embodiments of the present invention, the second material is an alloy material, which generally has higher hardness, wear resistance and corrosion resistance, and is very suitable for the tooth portion 200 that requires high strength and good wear resistance. Therefore, the use of alloy materials to manufacture the tooth portion 200 can significantly improve the ability of the gear to withstand large loads during the transmission process, reduce wear and extend the service life. For example, a combination of elements such as iron, carbon, copper, nickel and molybdenum can provide excellent comprehensive performance, including high hardness, good toughness and high temperature resistance. This high-performance tooth portion 200 material enables the gear to maintain a stable working state even in harsh working environments, thereby improving the reliability and efficiency of the entire transmission system. At the same time, the choice of alloy materials also provides greater flexibility for the design of the gear, which can be customized according to specific application requirements to achieve the best performance match.

[0035] Refer to Figures 2 to 4In some embodiments of the present invention, after assembly and fixation, the fixed tooth portion 200 and the base 100 have at least 6 step structures, which overcomes the technical bottleneck of the traditional powder metallurgy process in processing multi-step gears. The traditional powder metallurgy pressing process can usually only produce products with a maximum of 5 steps, while the method of the present invention can successfully produce gears with more steps, which not only expands the application scope of powder metallurgy technology, but also meets the demand for more complex gear structures. This ability allows gear designers to design the shape and function of gears more flexibly to adapt to various specific application scenarios, thereby improving the diversity and applicability of gear products. Secondly, the design of the multi-step structure provides more functional areas for the gear. Each step can be optimized according to its specific role in the transmission system, such as improving lubrication, reducing noise or increasing load-bearing capacity. This segmented structural design helps to optimize the overall performance of the gear and ensure that it can exhibit excellent mechanical properties under different working conditions. For example, some steps can be designed to be conducive to the distribution of lubricating oil, thereby reducing friction and wear; other steps can be designed to increase the contact area and improve the load-bearing capacity and stability of the gear. In addition, the multi-step structure can also provide better stress distribution. By rationally designing the size and position of each step, the load can be effectively dispersed and transferred, local stress concentration can be reduced, and the service life of the gear can be extended. This uniform stress distribution helps prevent premature failure due to excessive stress and ensures the stability and reliability of the gear during long-term operation. Furthermore, gears with a multi-step structure are also more advantageous during the assembly process. Since the gear is broken down into multiple parts, each part can be independently processed and quality controlled before being assembled. This method not only simplifies the manufacturing process, but also facilitates subsequent maintenance and replacement. If a part is damaged, only that part needs to be replaced without replacing the entire gear, thereby reducing maintenance costs and downtime. In addition, the design of the multi-step structure enhances the visual recognition and brand identity of the gear. The unique multi-step appearance can make the product stand out in the market, enhance the brand image, and facilitate users to identify and distinguish different gear models, which is of great significance for improving market competitiveness and customer satisfaction. For example, referring to Figure 4 The assembled and fixed combination gear 300 has a first step 310 , a second step 320 , a third step 330 , a fourth step 340 , a fifth step 350 and a sixth step 360 .

[0036] Refer to Figures 2 to 4In some embodiments of the present invention, the thickness of the mounting portion 110 is different from the thickness of the mating portion 210, so as to form at least one step structure after assembly and fixation. Furthermore, by making the thickness of the mounting portion 110 and the mating portion 210 different, an additional step structure can be formed on the assembled gear. This differentiated size configuration not only increases the complexity and functionality of the gear, but also enhances the connection strength between the tooth portion 200 and the base 100. Specifically, when the mating portion 210 is sleeved on the mounting portion 110 and fixed by interference fit, one or more steps will naturally be formed due to the different thicknesses of the two. These steps can provide additional mechanical locking to prevent relative sliding or separation between the tooth portion 200 and the base 100, thereby improving the stability and reliability of the overall structure.

[0037] In some manufacturing applications, the base 100 and the tooth 200 are formed by cutting raw materials, for example, by machining on a lathe, a milling machine, etc. In some embodiments of the present invention, the base 100 and the tooth 200 are respectively manufactured by a sintering process. It is easy to understand that sintering is a mature powder metallurgy forming technology. By heating metal powder at a high temperature to a temperature below its melting point, the powder particles diffuse and bond to form a dense and uniform solid structure. This method can ensure the uniformity and consistency of the internal structure of the gear base 100 and the tooth 200, reduce the porosity and defects in the material, thereby improving the overall density and mechanical properties of the parts, so that the sintered gear has higher strength, hardness and toughness, and can show excellent performance in various harsh working environments. Secondly, the sintering process has significant advantages in controlling dimensional accuracy. Since the shrinkage of the material during the sintering process is predictable, high-precision dimensional control can be achieved through precise design and mold making, which enables the base 100 and the tooth 200 to achieve very high matching accuracy during assembly, thereby ensuring the stability and reliability of the gear during the transmission process. High-precision dimensional control also reduces adjustment and finishing work during assembly, improving production efficiency and yield.

[0038] In addition, the sintering process is applicable to a variety of material combinations, including iron, carbon, copper and their alloys, which means that the most appropriate material ratio can be selected according to the actual application requirements to optimize the mechanical properties of the gear. For example, the base 100 can be made of a material with a lower cost but sufficient to meet the support requirements, while the tooth part 200 can use a higher performance alloy material. This flexibility allows the gear to provide the best performance while maintaining economy.

[0039] Furthermore, the sintering process helps to improve material utilization. Compared with traditional cutting, powder metallurgy technology forms parts by directly pressing and sintering powder materials, reducing material waste. This not only reduces production costs, but also helps protect the environment and meets the requirements of sustainable development. Finally, the sintering process performs well in mass production. Once the mold design is completed and verified, large-scale and continuous production can be achieved, which not only improves production efficiency, but also ensures the consistency of product quality. For gear products that need to be mass-produced, the sintering process can provide a stable supply to meet market demand.

[0040] In further manufacturing applications, the sintered base 100 is further machined to shape the part or improve the dimensional accuracy, especially to perform high-precision machining on the mounting portion 110 for assembly. Similarly, in further manufacturing applications, the sintered tooth portion 200 is sequentially deburred, finished and machined to improve the shape and dimensional accuracy of the part.

[0041] Optionally, after assembly and fixation, the combined gear 300 is subjected to flaw detection, cleaning, final inspection, and oil immersion treatment in sequence, and finally packaged and shipped to ensure the quality of the processed parts.

[0042] Reference Figure 4, according to the embodiment of the present invention, the combined gear includes a manufacturing method of a multi-material combined gear according to the embodiment of the present invention. By manufacturing the tooth portion 200 and the base 100 using different materials respectively and assembling them together by interference fit, not only the technical bottleneck of the traditional powder metallurgy process in dealing with multi-step complex structures is overcome, but also the overall performance of the gear is significantly improved; specifically, since the tooth portion 200 adopts alloy materials with higher hardness and stronger wear resistance, such as iron-carbon-copper-nickel-molybdenum alloy powder, the gear can withstand greater loads during the transmission process, reduce wear, and extend the service life; while the base 100 part uses materials with lower cost but sufficient to meet the support requirements, such as iron-carbon-copper alloy, so as to achieve cost optimization while ensuring performance. Such a material selection strategy not only improves the working efficiency of the gear, but also enhances its economy and market competitiveness; in addition, the reasonably designed interference fit method enhances the connection firmness between the tooth portion 200 and the base 100, ensuring the stability of the gear during operation. qualitative and reliability; in addition, the interference fit can effectively transmit torque and prevent relative sliding or separation between the tooth portion 200 and the base 100, which is particularly important under high load or vibration environments. This reliable connection method reduces maintenance requirements and reduces failure rates, thereby improving the overall availability and safety of the equipment; the successful implementation of the combined gear 300 not only broadens the application scope of powder metallurgy technology, but also provides an effective solution to solve the different requirements of various parts of the gear for mechanical properties, especially for various industrial equipment and mechanical devices that require high-performance transmission systems. This gear can provide higher load-bearing capacity, better wear resistance and longer service life. Therefore, it is particularly suitable for key transmission components in the fields of automobiles, aerospace, heavy machinery, etc., representing an important advancement and development direction of gear manufacturing technology, and bringing significant technical advantages and economic benefits to related industries.

[0043] Other structures and operations of the combined gear 300 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0044] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A method for manufacturing a multi-material combined gear, characterized in that: The following steps are involved: Preparing a substrate: using a first material to manufacture a substrate, wherein the substrate is provided with a mounting portion; Preparing the tooth portion: using a second material to manufacture the tooth portion, the hardness of the second material is greater than the hardness of the first material, the tooth portion is provided with a matching portion, and the outer periphery of the tooth portion is provided with teeth; Assembly and fixation: After the base and the tooth portion are prepared, the matching portion is sleeved on the mounting portion and interference fits with the mounting portion to fix the tooth portion and the base.

2. The method for manufacturing a multi-material combined gear according to claim 1, characterized in that: The mounting portion is cylindrical, the matching portion is provided with a mounting hole matching the outer shape of the mounting portion, and the mounting hole is interference-fitted with the mounting portion.

3. The method for manufacturing a multi-material combined gear according to claim 1, characterized in that: The first material is at least one of iron, carbon and copper.

4. A method for manufacturing a multi-material combined gear according to claim 1 or 3, characterized in that: The second material is an alloy material.

5. The method for manufacturing a multi-material combined gear according to claim 4, characterized in that: The second material is a combination of at least two of iron, carbon, copper, nickel and molybdenum.

6. The method for manufacturing a multi-material combined gear according to claim 1, characterized in that: After being assembled and fixed, the fixed tooth portion and the base body have at least 6 step structures.

7. The method for manufacturing a multi-material combined gear according to claim 6, characterized in that: The thickness of the mounting portion is different from the thickness of the matching portion, so as to form at least one step structure after being assembled and fixed.

8. The method for manufacturing a multi-material combined gear according to claim 1, characterized in that: In preparing the matrix, the matrix is ​​manufactured and formed by a sintering process.

9. The method for manufacturing a multi-material combined gear according to claim 1, characterized in that: In preparing the tooth portion, the tooth portion is manufactured by a sintering process.

10. Combined gear, characterized in that: The gear is manufactured using the manufacturing method of a multi-material combined gear as described in any one of claims 1 to 9.

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