Planetary gear set forge piece

Abstract

The utility model discloses a planetary gear set forge piece, and relates to the technical field of mechanical transmission parts, the planetary gear set forge piece comprises a planetary gear main body, a gear ring main body and a sun gear main body, the gear ring main body and the sun gear main body are meshed with the planetary gear main body, and the planetary gear main body, the gear ring main body and the sun gear main body are all of composite layer forge piece structures. The planetary gear comprises a planetary gear main body, all the layers are connected in a metallurgical bonding mode, the planetary gear main body is provided with a planetary gear inner core layer, a planetary gear transition strengthening layer and a planetary gear functional layer, the planetary gear inner core layer is made of porous iron-based alloy, the planetary gear transition strengthening layer is made of bainite steel, the bainite steel covers the outer side of the porous iron-based alloy, and the planetary gear functional layer is made of stainless steel. The planet wheel functional layer is made of cobalt-based high-temperature alloy, and the cobalt-based high-temperature alloy covers the tooth surface of the planet wheel body. According to the planetary gear set forge piece, through the design of the composite layered structure, light weight, high abrasion resistance, high impact resistance and excellent high-temperature stability are cooperatively achieved, and the overall transmission reliability and efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the technical field of mechanical transmission parts, specifically a planetary gear set forging. Background Technology

[0002] In today's rapidly advancing industrial modernization, the transmission system, as a core component of mechanical equipment, directly determines the overall operating efficiency, reliability, and service life of the machine. Planetary gear sets, as a key component of the transmission system, are widely used in high-end equipment fields such as aerospace, new energy vehicles, wind power generation, and construction machinery, undertaking core functions such as power transmission, speed change, torque distribution, and torque conversion.

[0003] Planetary gear sets consist of components such as a sun gear, planet gears, an internal gear ring, and a planet carrier. They achieve power distribution and load balancing through multi-tooth meshing, and have significant advantages such as compact structure, large transmission ratio, and strong load-bearing capacity. However, as the core component of the transmission system, existing planetary gear sets have long faced the technical bottleneck of being difficult to balance lightweight, wear resistance, and adaptability to extreme working conditions.

[0004] Traditional single-material forgings have significant defects when running at high speed and heavy load. A single metal material cannot simultaneously meet the requirements of high hardness of the tooth surface, toughness of the matrix, and shock absorption and energy absorption, which makes the gears prone to pitting, fatigue spalling or overall fracture. At the same time, the degradation of material properties under high temperature will further aggravate the failure risk, thereby reducing the service life of planetary gear sets.

[0005] Therefore, in order to address the above problems, the applicant needs to design a planetary gear set forging to solve the problem. Utility Model Content

[0006] The purpose of this utility model is to provide a planetary gear set forging to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a planetary gear set forging, comprising a planetary gear body and a gear ring body and a sun gear body meshing with the planetary gear body. The planetary gear body, gear ring body, and sun gear body are all composite layer forging structures, and the layers are connected by metallurgical bonding. The planetary gear body is provided with a planetary gear inner core layer, a planetary gear transition strengthening layer, and a planetary gear functional layer. The planetary gear inner core layer is a porous iron-based alloy, the planetary gear transition strengthening layer is bainitic steel, and the bainitic steel covers the outside of the porous iron-based alloy. The planetary gear functional layer is a cobalt-based high-temperature alloy, and the cobalt-based high-temperature alloy covers the tooth surface of the planetary gear body.

[0008] Furthermore, the gear ring body is provided with a gear ring base layer, a gear ring transition layer and a gear ring functional layer from the inside to the outside, and the outer surface of the gear ring functional layer is in contact with the outer surface of the planetary gear body.

[0009] Furthermore, the toothed ring base layer is made of low-carbon alloy steel.

[0010] Furthermore, the gear ring transition layer is a nickel-based alloy, and the inner side of the nickel-based alloy is in contact with the outer side of the low-carbon alloy steel.

[0011] Furthermore, the gear ring functional layer is made of high-carbon tool steel, and the inner side of the high-carbon tool steel is in contact with the outer side of the nickel-based alloy.

[0012] Furthermore, the sun gear body is provided with a sun gear inner core layer and a sun gear reinforcement layer from the inside to the outside, and the outer surface of the sun gear reinforcement layer is in contact with the outer surface of the planet gear body.

[0013] Furthermore, the inner core layer of the sun gear is made of ductile iron.

[0014] Furthermore, the sun gear reinforcement layer is made of boron steel, and the boron steel covers the outer side of the ductile iron.

[0015] Compared with the prior art, the beneficial effects of this utility model are: the planetary gear set forging, through a composite layered structure design, synergistically achieves lightweight, high wear resistance, strong impact resistance, and excellent high-temperature stability, thereby improving the overall transmission reliability and efficiency. The specific details are as follows:

[0016] When in use, this planetary gear set forging achieves weight reduction and energy absorption through the porous iron-based alloy in the inner core layer of the planetary gears, ensures toughness and economy through the low-carbon alloy steel in the gear ring base layer, and provides shock absorption support through the ductile iron in the inner core of the sun gear. At the same time, transition layers such as bainitic steel and nickel-based alloys effectively coordinate the differences in thermo-mechanical properties between layers to avoid interface failure, while surface functional materials such as cobalt-based high-temperature alloys, high-carbon tool steel, and boron steel specifically endow the tooth surface with ultra-high hardness, wear resistance, and high-temperature stability. Ultimately, it forms advantages in terms of lightweight, impact resistance, fatigue life, adaptability to extreme working conditions, and manufacturing cost, and significantly improves the overall reliability and transmission efficiency of the gear system. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the planetary gear body, the gear ring body, and the sun gear body of this utility model;

[0018] Figure 2 This is a schematic diagram of the layered distribution structure of the main body of the gear ring of this utility model;

[0019] Figure 3 This is a schematic diagram of the layered distribution structure of the planetary gear body of this utility model;

[0020] Figure 4 This is a schematic diagram of the layered distribution structure of the sun gear body of this utility model.

[0021] In the diagram: 1. Gear ring body; 2. Planetary gear body; 3. Sun gear body; 4. Gear ring base layer; 5. Gear ring transition layer; 6. Gear ring functional layer; 7. Planetary gear inner core layer; 8. Planetary gear transition reinforcement layer; 9. Planetary gear functional layer; 10. Sun gear inner core layer; 11. Sun gear reinforcement layer. Detailed Implementation

[0022] 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.

[0023] like Figures 1-4 As shown, a planetary gear set forging of this utility model includes a planetary gear body 2 and a gear ring body 1 and a sun gear body 3 that mesh with the planetary gear body. The planetary gear body 2, gear ring body 1 and sun gear body 3 are all composite layer forging structures, and the layers are connected by metallurgical bonding. The planetary gear body 2 is provided with a planetary gear inner core layer 7, a planetary gear transition strengthening layer 8 and a planetary gear functional layer 9. The planetary gear inner core layer 7 is a porous iron-based alloy, the planetary gear transition strengthening layer 8 is bainitic steel, and the bainitic steel covers the outside of the porous iron-based alloy. The planetary gear functional layer 9 is a cobalt-based high-temperature alloy, and the cobalt-based high-temperature alloy covers the tooth surface of the planetary gear body 2.

[0024] The gear ring body 1 is provided with a gear ring base layer 4, a gear ring transition layer 5 and a gear ring functional layer 6 from the inside to the outside. The outer surface of the gear ring functional layer 6 is in contact with the outer surface of the planetary gear body 2, which realizes the gradient distribution of material properties, optimizes the load transmission path, reduces stress concentration, and thus improves the overall stability and fatigue life of the gear ring in high-speed meshing.

[0025] The gear ring base layer 4 is made of low-carbon alloy steel, which provides excellent toughness and machinability while reducing manufacturing costs. The high ductility of low-carbon alloy steel effectively absorbs impact loads and prevents brittle fracture of the gear set during startup or speed change. In addition, its good weldability facilitates metallurgical bonding with other layers, ensuring the integrity of the composite structure and thus improving the reliability and economy of the gear ring under complex working conditions.

[0026] The gear ring transition layer 5 is made of nickel-based alloy, and the inner side of the nickel-based alloy contacts the outer side of the low-carbon alloy steel. This combination of nickel-based alloy and low-carbon alloy provides high-temperature stability and corrosion resistance, reduces the difference in thermal expansion coefficients between the low-carbon steel of the gear ring base layer 4 and the high-carbon tool steel of the gear ring functional layer 6, and avoids interfacial stress cracking. At the same time, the strengthening effect of the nickel-based alloy improves the creep resistance of the gear ring in high-temperature environments and extends the service life of the gear set under extreme conditions.

[0027] The gear ring functional layer 6 is made of high-carbon tool steel, with the inner side of the high-carbon tool steel in contact with the outer side of the nickel-based alloy. This gives the gear ring surface extremely high hardness and wear resistance. The excellent wear resistance of the high-carbon tool steel directly addresses the friction and impact during meshing, reducing pitting and peeling on the tooth surface. Combined with the buffering effect of the gear ring transition layer 5, this ensures that the gear ring functional layer 6 maintains its integrity under heavy loads, thereby improving the gear ring's load-bearing capacity and transmission accuracy.

[0028] The sun gear body 3 is provided with a sun gear inner core layer 10 and a sun gear reinforcement layer 11 from the inside out. The outer surface of the sun gear reinforcement layer 11 is in contact with the outer surface of the planet gear body 2. The arrangement of the sun gear inner core layer 10 and the sun gear reinforcement layer 11 from the inside out, and ensuring that the outer surface of the reinforcement layer is in contact with the planet gear body 2, simplifies the structural design and optimizes performance matching. The sun gear inner core layer 10 provides core support, while the sun gear reinforcement layer 11 focuses on surface function, reducing material costs and production complexity. In addition, the sun gear reinforcement layer 11 directly meshes with the planet gear body 2, improving the contact stress distribution and enhancing the power transmission efficiency and deformation resistance of the sun gear.

[0029] The inner core layer 10 of the sun gear is made of ductile iron. The ductile iron inner core layer 10 utilizes its good damping properties, castability, and cost-effectiveness. The high damping characteristics of ductile iron effectively absorb vibration and noise in gear transmission and improve the smoothness of operation. At the same time, its high strength and toughness provide a solid foundation for the reinforcing layer and avoid internal defects. Thus, while ensuring lightweight, the overall durability and economy of the sun gear are enhanced.

[0030] The sun gear reinforcing layer 11 is made of boron steel, which covers the outer side of the ductile iron. This gives the sun gear surface ultra-high strength and wear resistance. The high hardness and heat treatment strengthening properties of boron steel can resist wear and impact during meshing, extending the life of the sun gear tooth surface. At the same time, its metallurgical bond with the ductile iron core ensures the interlayer bonding strength and prevents delamination failure, thereby improving the reliability and performance stability of the sun gear under high-speed and high-load conditions.

[0031] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A planetary gear set forging, characterized in that: The system includes a planetary gear body (2) and a gear ring body (1) and a sun gear body (3) that mesh with the planetary gear body. The planetary gear body (2), gear ring body (1) and sun gear body (3) are all composite layer forging structures, and the layers are connected by metallurgical bonding. The planetary gear body (2) is provided with a planetary gear inner core layer (7), a planetary gear transition reinforcement layer (8) and a planetary gear functional layer (9). The planetary gear inner core layer (7) is a porous iron-based alloy, the planetary gear transition reinforcement layer (8) is bainitic steel, and the bainitic steel covers the outside of the porous iron-based alloy. The planetary gear functional layer (9) is a cobalt-based high-temperature alloy, and the cobalt-based high-temperature alloy covers the tooth surface of the planetary gear body (2).

2. A planetary gear set forging according to claim 1, characterized in that: The gear ring body (1) is provided with a gear ring base layer (4), a gear ring transition layer (5) and a gear ring functional layer (6) from the inside to the outside, and the outer surface of the gear ring functional layer (6) is in contact with the outer surface of the planetary gear body (2).

3. A planetary gear set forging according to claim 2, characterized in that: The toothed ring base layer (4) is made of low-carbon alloy steel.

4. A planetary gear set forging according to claim 3, characterized in that: The gear ring transition layer (5) is a nickel-based alloy, and the inner side of the nickel-based alloy is in contact with the outer side of the low-carbon alloy steel.

5. A planetary gear set forging according to claim 4, characterized in that: The gear ring functional layer (6) is made of high carbon tool steel, and the inner side of the high carbon tool steel is in contact with the outer side of the nickel-based alloy.

6. A planetary gear set forging according to claim 1, characterized in that: The sun gear body (3) is provided with a sun gear inner core layer (10) and a sun gear reinforcing layer (11) from the inside to the outside, and the outer surface of the sun gear reinforcing layer (11) is in contact with the outer surface of the planet gear body (2).

7. A planetary gear set forging according to claim 6, characterized in that: The inner core layer (10) of the sun gear is made of ductile iron.

8. A planetary gear set forging according to claim 6, characterized in that: The sun gear reinforcement layer (11) is boron steel, and the boron steel covers the outside of the ductile iron.

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