Method of manufacturing a multi-material composite gear and composite gear

Abstract

The application discloses a manufacturing method of a multi-material combined gear and the combined gear, and the manufacturing method of the multi-material combined gear comprises the following steps: preparing a base body; manufacturing the base body by using a first material, and the base body is provided with a mounting part; preparing a tooth part; manufacturing the tooth part by using a second material, the hardness of the second material is greater than that of the first material, the tooth part is provided with a matching part, and the outer periphery of the tooth part is provided with a tooth; and assembling and fixing; after the base body and the tooth part are prepared, the matching part is sleeved on 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 two parts of the tooth part and the base body and is manufactured by using different materials, the problem that a multi-step structure gear is difficult to form is solved, and the mechanical properties of each part of the gear are optimized, the combined design not only realizes the demand of the complex structure design of the gear, improves the hardness and wear resistance of the tooth part, and enhances the stability and reliability of the overall structure.

Description

TECHNICAL FIELD

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

[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 becoming higher and higher, especially in complex working environments in terms of durability and reliability. Powder metallurgy technology has been widely used in gear manufacturing due to its ability to efficiently produce complex-shaped parts, high material utilization, and relatively low cost.

[0003] However, there are some limitations in traditional powder metallurgy pressing process. First of all, when it comes to multi-step structure gears, the existing technology can only achieve a maximum of five steps (such as two upward steps and three downward steps) of product pressing forming. This limitation is due to the complexity of mold design and potential problems in powder filling and compaction process. For gears requiring six or more steps, it is difficult to achieve the desired effect using traditional single pressing forming method, which greatly limits the ability to manufacture complex gears by 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 base part mainly plays a supporting role, and the performance requirements of the material are relatively low. However, in the existing powder metallurgy one-time pressing process, the entire gear must be pressed with the same material, which obviously cannot meet the best material selection for the tooth and base parts respectively. SUMMARY

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

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

[0007] The manufacturing method of the multi-material combined gear according to the present application comprises the following steps:

[0008] Preparation of the base body: a base body is manufactured by using a first material, and the base body is provided with a mounting portion;

[0009] Preparation of the tooth portion: a tooth portion is manufactured by using a second material, the hardness of the second material is greater than that 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;

[0010] Assembly and fixation: after the preparation of the base body and the tooth portion, the matching portion is sleeved on the mounting portion and is in interference fit with the mounting portion, so as to fix the tooth portion and the base body.

[0011] The manufacturing method of the multi-material combined gear according to the present application has at least the following beneficial effects: by decomposing the gear into a tooth portion and a base body and manufacturing them by using different materials respectively, the technical difficulties of the traditional powder metallurgy process in processing 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 the high requirements of mechanical properties in the transmission process, while the base body can use a first material with lower cost, thereby reducing the production cost while ensuring the overall performance. In addition, by designing a reasonable interference fit mode, the connection between the tooth portion and the base body is 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 range of powder metallurgy technology, but also provides a feasible solution for realizing the differentiation of material properties in different parts of the gear, thereby promoting the technological progress and development in related fields.

[0012] The manufacturing method of the multi-material combined gear according to some embodiments of the present application, the mounting portion is cylindrical, the matching portion is provided with a mounting hole matched with the shape of the mounting portion, and the mounting hole is in interference fit with the mounting portion.

[0013] The manufacturing method of the multi-material combined gear according to some embodiments of the present application, the first material is at least one of iron, carbon and copper.

[0014] The manufacturing method of the multi-material combined gear according to some embodiments of the present application, the second material is an alloy material.

[0015] The manufacturing method of the multi-material combined gear according to some embodiments of the present application, the second material is a combination of at least two of iron, carbon, copper, nickel and molybdenum.

[0016] According to the manufacturing method of the multi-material combined gear according to some embodiments of the present application, the tooth part and the base after assembly and fixation have at least 6 step structures.

[0017] According to the manufacturing method of the multi-material combined gear according to some embodiments of the present application, the thickness of the mounting part is different from the thickness of the fitting part, so as to form at least 1 step structure after assembly and fixation.

[0018] According to the manufacturing method of the multi-material combined gear according to some embodiments of the present application, in the preparation of the base, the base is manufactured into a shape by using a sintering process.

[0019] According to the manufacturing method of the multi-material combined gear according to some embodiments of the present application, in the preparation of the tooth part, the tooth part is manufactured by using a sintering process.

[0020] The combined gear according to the present application comprises the manufacturing method of the multi-material combined gear according to the present application.

[0021] The combined gear according to the present application has at least the following beneficial effects: by manufacturing the tooth part and the base with different materials respectively and assembling them together by interference fit, not only the technical bottleneck of traditional powder metallurgy process in handling multi-step complex structure is overcome, but also the overall performance of the gear is significantly improved; specifically, since the tooth part uses an alloy material with higher hardness and better wear resistance, such as iron-carbon-copper-nickel-molybdenum alloy powder, the gear can withstand greater load during transmission, reduce wear and prolong service life; the base part selects a material with lower cost but sufficient support requirement, such as iron-carbon-copper alloy, so as to optimize the cost while ensuring the performance, which not only improves the working efficiency of the gear, but also enhances its economy and market competitiveness; in addition, the reasonable interference fit enhances the connection firmness between the tooth part and the base, ensuring the stability and reliability of the gear during operation; in addition, interference fit can effectively transmit torque and prevent relative sliding or separation between the tooth part and the base, which is particularly important in high-load or vibration environment, this reliable connection method reduces maintenance requirements and failure rate, thereby improving the overall availability and safety of the equipment; the successful implementation of the combined gear not only broadens the application range of powder metallurgy technology, but also provides an effective solution to the different mechanical performance requirements of each part of the gear, especially for various industrial equipment and mechanical devices that require high-performance transmission systems, this gear can provide higher 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 progress and development direction of gear manufacturing technology, bringing significant technical advantages and economic benefits to related industries.

[0022] Additional aspects and advantages of the present application will be in part apparent and in part pointed out below in the description of the application. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description of the embodiments, given by way of example, and with reference to the following drawings.

[0024] Figure 1 A flowchart of a manufacturing method of a multi-material combined gear according to an embodiment of the present application;

[0025] Figure 2 A sectional view of a base of a manufacturing method of a multi-material combined gear according to an embodiment of the present application;

[0026] Figure 3 A sectional view of a tooth portion of a manufacturing method of a multi-material combined gear according to an embodiment of the present application;

[0027] Figure 4 A sectional view of a combined gear according to an embodiment of the present application.

[0028] DETAILED DESCRIPTION

[0029] Base 100; mounting portion 110;

[0030] Tooth portion 200; mating portion 210; tooth 220;

[0031] Combined gear 300; first step 310; second step 320; third step 330; fourth step 340; fifth step 350; sixth step 360. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described in detail below with reference to the attached drawings. The embodiments described below are examples of the present application, and are not intended to limit the present application. The same or similar components are denoted by the same or similar reference numerals, and repeated explanation is omitted.

[0033] In the description of the present application, it is to be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0034] In the description of the present application, the meaning of one or more is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If the first, second is described, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0035] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood broadly, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0036] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] In mechanical transmission systems, gears as key transmission elements are widely used 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 environment. Powder metallurgy technology has been widely used in gear manufacturing due to its ability to efficiently produce complex-shaped parts, high material utilization, relatively low cost and other advantages.

[0038] However, there are some limitations in the traditional powder metallurgy pressing process. First, when it comes to multi-step structure gears, the existing technology can usually only achieve product pressing forming of a maximum of five steps (such as two upward steps plus three downward steps). This limitation is due to the complexity of the mold design and the problems that may occur during powder filling and compaction. For gears that require six or more steps, it is difficult to achieve the desired effect using traditional single pressing forming methods, which greatly limits the ability to manufacture complex gears through powder metallurgy technology.

[0039] Secondly, different parts of the gear have different requirements for their 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 base part mainly plays a supporting role, and the performance requirements of the material are relatively low. However, in the existing powder metallurgy one-time pressing process, the entire gear must be pressed with the same material, which obviously cannot meet the optimal material selection of the tooth part and the base part at the same time.

[0040] To this end, as shown in Figures 1 to 4 a manufacturing method of a multi-material combined gear is proposed, comprising the following steps:

[0041] S100, preparing the base 100: the base 100 is manufactured by using a first material, and the base 100 is provided with a mounting part 110;

[0042] S200, preparing the tooth part 200: the tooth part 200 is manufactured by using a second material, the hardness of the second material is greater than the hardness of the first material, the tooth part 200 is provided with a matching part 210, and the outer periphery of the tooth part 200 is provided with a tooth 220;

[0043] S300, assembly and fixation: after preparing the base 100 and preparing the tooth part 200, the matching part 210 is sleeved on the mounting part 110 and is in interference fit with the mounting part 110, so as to fix the tooth part 200 and the base 100.

[0044] It should be noted that by decomposing the gear into tooth part 200 and base 100, and manufacturing them with different materials respectively, the technical difficulties of traditional powder metallurgy process in dealing with multi-step complex structure are effectively solved. This method allows the tooth part 200 to use a second material with higher hardness and wear resistance to meet the high requirements of its mechanical properties in the transmission process, while the base 100 can use a first material with lower cost, thereby reducing the production cost while ensuring the overall performance. In addition, by designing a reasonable interference fit method, the connection between the tooth part 200 and the base 100 is more firm and reliable, not only enhancing the overall strength of the gear, but also improving its stability and durability in actual work. Overall, this innovative manufacturing method not only expands the application range 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 the technological progress and development in related fields.

[0045] In some embodiments, the mounting portion 110 is a solid structure, and the matching portion 210 has a hollow structure. The matching portion 210 and the mounting portion 110 are designed with a profiled shape, for example, both the mounting portion and the matching portion are polygons (not shown in the figure), such as triangles, squares, pentagons, etc. In some embodiments of the present application, both the mounting portion 110 and the matching portion 210 are circular. Specifically, the mounting portion 110 is cylindrical, and the matching portion 210 is provided with a mounting hole matching the shape of the mounting portion 110, which is in interference fit with the mounting portion 110. First, by designing the mounting portion 110 as a cylinder and providing a corresponding mounting hole in the matching portion 210, the precise 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 cooperation during assembly and reduces assembly errors caused by irregular shapes. This 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 matching portion 210 slightly smaller than the outer diameter of the mounting portion 110, so that when the matching portion 210 is sleeved on the mounting portion 110, a certain compressive stress will be generated, thereby forming a firm mechanical combination. 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 change during use, so the interference fit significantly improves the overall rigidity and durability of the gear, enabling it to withstand higher torque and more severe working conditions. In addition, interference fit also helps to improve the sealing performance of the gear. In some applications, the gear may need to work in an environment with lubricants or other media, and 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, improving user experience.

[0046] Optionally, the first material is at least one of iron, carbon, and copper. It is readily understood that iron, carbon, and copper are all commonly used materials in powder metallurgy processes, and they perform very well in the sintering process. These materials are easily sintered into shape at high temperatures and can form a uniform and dense microstructure, reducing internal defects and porosity, and improving the density and mechanical properties of the parts. They have good processing performance and cost-effectiveness. The widespread use of these materials means that they are more readily available in the supply chain, reducing the cost and difficulty of raw material procurement. In addition, the mature processing technology of these materials makes the production process more controllable, helping to improve manufacturing efficiency and consistency of product quality. Secondly, iron, carbon, and copper and their alloys perform well in mechanical properties, meeting the basic needs of the gear base body 100. Iron is a common structural material with high strength and toughness, suitable for parts that bear large loads. Carbon can enhance the hardness and wear resistance of the material. Copper provides good electrical conductivity and corrosion resistance. By properly proportioning these elements, the mechanical properties of the base body 100 can be adjusted according to the actual application requirements, so that it has sufficient strength and rigidity, and also maintains appropriate ductility and corrosion resistance. Furthermore, using iron, carbon, and copper as the material of the base body 100 can also optimize the cost structure of the entire gear. Compared to the high-performance alloy material required for the tooth part 200, these materials are relatively low in cost but still provide sufficient support performance. This differentiated material selection strategy not only ensures the overall performance of the gear, but also effectively controls the cost, enhancing the market competitiveness of the product. In particular, in mass production and cost-sensitive applications, such material selection is particularly important.

[0047] 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 application, the second material is an alloy material. Such alloy materials generally have higher hardness, wear resistance, and corrosion resistance, and are very suitable for tooth parts 200 that require high strength and good wear resistance. Therefore, using alloy materials to manufacture tooth parts 200 can significantly improve the ability of the gear to withstand large loads during transmission, reduce wear, and prolong service life. For example, the combination of elements such as iron, carbon, copper, nickel, and molybdenum can provide excellent overall performance, including high hardness, good toughness, and high-temperature resistance. Such high-performance tooth part 200 materials enable the gear to maintain stable working conditions in harsh working environments, thereby improving the reliability and efficiency of the entire transmission system. At the same time, the selection 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.

[0048] Referring again to Figures 2 to 4In some embodiments of the present application, the fixed gear teeth 200 and the base 100 have at least 6 step structures after assembly and fixation, overcoming the technical bottleneck of traditional powder metallurgy process in processing multi-step gears. Traditional powder metallurgy pressing process can usually only manufacture products with a maximum of 5 steps, while the method of the present application can successfully manufacture gears with more steps, not only expanding the application range of powder metallurgy technology, but also meeting the demand for more complex gear structures. This ability enables gear designers to more flexibly design the shape and function of the gear to adapt to various specific application scenarios, thereby improving the diversity and applicability of gear products. Secondly, the design of multi-step structure provides more functional areas for the gear. Each step can be optimally designed according to its specific role in the transmission system, such as improving lubrication, reducing noise or increasing load capacity. This segmented structural design helps to optimize the overall performance of the gear, ensuring excellent mechanical properties under different working conditions. For example, certain steps can be designed to facilitate the distribution of lubricating oil, thereby reducing friction and wear; other steps can be designed to increase the contact area, increasing the load capacity and stability of the gear. In addition, the multi-step structure can also provide better stress distribution, by reasonably designing the size and position of each step, the load can be effectively dispersed and transmitted, reducing local stress concentration, thereby prolonging the service life of the gear. This uniform stress distribution helps to prevent early failure due to excessive stress, ensuring the stability and reliability of the gear during long-term operation. Furthermore, the multi-step structure gear has advantages in the assembly process. Since the gear is divided into multiple parts, each part can be independently processed and quality controlled, and then assembled. This way 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, rather than the entire gear, thereby reducing maintenance costs and downtime. In addition, the design of multi-step structure enhances the visual recognition and brand identification of the gear. The unique multi-step appearance can make the product stand out in the market, enhance the brand image, and facilitate user identification and differentiation of different gear models, which is of great significance to improve 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.

[0049] Again referring to Figures 2 to 4In some embodiments of the present application, 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, and such a 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 body 100. Specifically, when the mating portion 210 is sleeved on the mounting portion 110 and fixed by interference fit, due to the difference in thickness between the two, one or more steps will naturally be formed, which can provide additional mechanical locking effect to prevent relative sliding or separation between the tooth portion 200 and the base body 100, thereby improving the stability and reliability of the overall structure.

[0050] In some manufacturing applications, the base body 100 and the tooth portion 200 are machined from raw materials, for example, by lathe, milling machine, etc. In some embodiments of the present application, the base body 100 and the tooth portion 200 are respectively manufactured by sintering process. It is easy to understand that sintering is a mature powder metallurgy forming technology, which can ensure the uniformity and consistency of the internal structure of the gear base body 100 and the tooth portion 200, reduce the porosity and defects in the material, thereby improving the overall density and mechanical properties of the part, so that the sintered gear has higher strength, hardness and toughness, and can perform excellent performance in various harsh working environments. Secondly, the sintering process has significant advantages in controlling the size accuracy, because the shrinkage of the material during sintering is predictable, and high-precision size control can be achieved through precise design and mold making, which enables the base body 100 and the tooth portion 200 to achieve very high fitting accuracy when assembled, thereby ensuring the stability and reliability of the gear during transmission. High-precision size control also reduces the adjustment and finishing work during assembly, improving production efficiency and yield.

[0051] In addition, the sintering process is suitable for a variety of material combinations, including iron, carbon, copper and their alloys, etc., which means that the most suitable material ratio can be selected according to the actual application requirements to optimize the mechanical properties of the gear. For example, the base body 100 part can be selected with lower cost but sufficient material to meet the support requirements, while the tooth portion 200 can use higher performance alloy materials. Such flexibility enables the gear to maintain economy while providing optimal performance.

[0052] Moreover, the sintering process helps to improve material utilization. Compared with traditional cutting processing, powder metallurgy technology forms parts by directly pressing and sintering powder materials, reducing material waste. This not only reduces production costs, but also helps environmental protection and meets the requirements of sustainable development. Finally, the sintering process performs well in batch production. Once the mold design is completed and verified, large-scale and continuous production can be realized, which not only improves production efficiency, but also guarantees the consistency of product quality. For gear products that need mass production, the sintering process can provide stable supply to meet market demand.

[0053] Further manufacturing applications, the base 100 after sintering is further machined to shape or improve the dimensional accuracy of the part, especially the mounting portion 110 for assembly can be processed with high precision. Similarly, further manufacturing applications, the sintered tooth portion 200 is sequentially deburred, finished and machined to improve the shape and dimensional accuracy of the part.

[0054] Optionally, after assembly and fixation, the combined gear 300 is sequentially subjected to flaw detection, cleaning, final inspection, oil immersion treatment, and finally packaged for shipment, ensuring the quality of the processed parts.

[0055] Reference Figure 4, according to the embodiment of the application, the combination gear includes a manufacturing method of a multi-material combination gear according to the embodiment of the application. By manufacturing the tooth part 200 and the base body 100 using different materials respectively and assembling them together in the interference fit manner, not only the technical bottleneck of the traditional powder metallurgy process in processing the multi-step complex structure is overcome, but also the overall performance of the gear is significantly improved; specifically, since the tooth part 200 adopts the alloy material with higher hardness and better wear resistance, such as iron-carbon-copper-nickel-molybdenum alloy powder, the gear can withstand greater load during transmission, reduce wear and prolong service life; and the base body 100 part selects the material with lower cost but sufficient support requirement, such as iron-carbon-copper alloy, so as to realize cost optimization while ensuring performance, such material selection strategy not only improves the working efficiency of the gear, but also enhances its economy and market competitiveness; in addition, the interference fit manner designed reasonably enhances the connection firmness between the tooth part 200 and the base body 100, and ensures the stability and reliability of the gear during operation; in addition, the interference fit can effectively transmit torque and prevent relative sliding or separation between the tooth part 200 and the base body 100, which is particularly important in high load or vibration environment, such reliable connection manner reduces maintenance requirements, reduces failure rate, and thus improves the overall availability and safety of the equipment; the successful implementation of the combination gear 300 not only widens the application range of the powder metallurgy technology, but also provides an effective solution to the different mechanical performance requirements of each part of the gear, especially for various industrial equipment and mechanical devices that require high-performance transmission systems, such gear can provide higher 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 and the like, represents an important progress and development direction of gear manufacturing technology, and brings significant technical advantages and economic benefits to the related industry.

[0056] Other configurations and operations of the combination gear 300 according to the embodiment of the application are known to those skilled in the art, and will not be described in detail here.

[0057] The embodiments of the application are described in detail above in combination with the drawings, but the application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application.

Claims

1. A method of manufacturing a multi-material hybrid gear, characterized by, The method comprises the following steps: preparing a base body by using a first material, the base body being provided with a mounting portion; preparing a tooth portion by using a second material, the second material having a higher hardness than the first material, the tooth portion being provided with a fitting portion, and the tooth portion being provided with teeth around the outer periphery thereof; the base body and the tooth portion are respectively manufactured into a shape by using a sintering process; assembling and fixing: after the preparation of the base body and the tooth portion, the fitting portion is sleeved on the mounting portion and is in interference fit with the mounting portion, so as to fix the tooth portion and the base body; after the assembling and fixing, the fixed tooth portion and the base body have at least six step structures, and the thickness of the mounting portion is different from the thickness of the fitting portion, so as to form at least one step structure after the assembling and fixing.

2. A method of manufacturing a multi-material hybrid gear according to claim 1, wherein: the mounting portion is in a cylindrical shape, the fitting portion is provided with a mounting hole matched with the shape of the mounting portion, and the mounting hole is in interference fit with the mounting portion.

3. A method of manufacturing a multi-material hybrid gear as claimed in claim 1, wherein: the first material is at least one of iron, carbon and copper.

4. A method of manufacturing a multi-material hybrid gear according to claim 1 or 3, wherein: the second material is an alloy material.

5. A method of manufacturing a multi-material hybrid gear according to claim 4, wherein: the second material is at least two of iron, carbon, copper, nickel and molybdenum.

6. A combination gear characterized by: a multi-material combined gear is manufactured by using the method according to any one of claims 1 to 5.

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