Light-weight motor shaft inertia friction welding embedded type pre-compensation welding joint structure

Abstract

The utility model discloses a lightweight motor shaft inertia friction welding embedded type pre-compensation welding joint structure which is characterized in that a butt joint groove is formed in the middle of the welding surface of a first shaft tube, a first outer clamping ring is embedded in the outer groove wall surface of the butt joint groove, and a first inner clamping ring is embedded in the inner groove wall surface of the butt joint groove; a butt joint boss is fixedly connected to the middle of the welding face of the second shaft tube, a second outer clamping ring is embedded in the outer boss face of the butt joint boss, a second inner clamping ring is embedded in the inner boss face of the butt joint boss, plastic deformation metal forms a flash ring, the time for milling the outer surface of the flash ring is shortened, and the machining efficiency is improved. Solid-phase welding is carried out between the first inner clamping ring and the second inner clamping ring and between the first outer clamping ring and the second outer clamping ring, positioning clamping rings jointly embedded in the first shaft tube and the second shaft tube are formed, and the first shaft tube and the second shaft tube are tightly connected in cooperation with a welding seam formed between the first shaft tube and the second shaft tube after friction welding. The tensile strength of the welding part is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solid phase welding, in particular to a lightweight motor shaft inertia friction welding embedded type pre-compensation welding joint structure. Background Art

[0002] Hollow shafts are increasingly used in new energy vehicles because they can cool down the motor and improve the motor's performance over a long period of time. According to incomplete statistics, hollow shafts accounted for 40% of the market in 2019, and there is a trend of increasing year by year. Existing closed cavity manufacturing processes for hollow shafts include welding, spinning, and rotary forging.

[0003] Rotary friction welding is widely used in the connection of rotating bodies. It is a solid phase welding. Compared with fusion welding, there is no phenomenon such as cold welding. It has the advantages of high welding strength, fine structure after welding, and few defects.

[0004] The existing welding joint structure has the following shortcomings: the existing structure generally has problems such as low welding coaxiality, low welding strength and high welding stress when in use, and thicker burrs are easily generated at the outer or inner edges of the welds produced by the existing structure, which require further fine processing to clean, which is time-consuming and labor-intensive. At the same time, the existing structure has low axial tensile strength and low radial shear strength. Utility Model Content

[0005] The purpose of the utility model is to provide a lightweight motor shaft inertia friction welding embedded pre-compensation welding joint structure to improve the overall work efficiency in view of the above-mentioned problems and shortcomings.

[0006] The technical problems solved by the utility model are:

[0007] (1) The existing structures generally have problems such as low welding coaxiality, low welding strength and high welding stress when in use;

[0008] (2) The outer or inner edges of the welds produced by the existing structure are prone to thick flash, which requires further finishing to clean, which is time-consuming and labor-intensive;

[0009] (3) The existing structure has low axial tensile strength and low radial shear strength.

[0010] The purpose of the utility model can be achieved through the following technical solutions: a lightweight motor shaft inertia friction welding embedded pre-compensation welding joint structure, including a first shaft tube and a second shaft tube, the end faces of the first shaft tube and the second shaft tube close to each other are welding surfaces, a docking groove is opened in the middle of the welding surface of the first shaft tube, the docking groove is provided with a groove bottom surface, an outer groove wall surface and an inner groove wall surface, a first outer retaining ring is embedded on the outer groove wall surface of the docking groove, a first inner retaining ring is embedded on the inner groove wall surface of the docking groove, a docking boss is fixedly connected in the middle of the welding surface of the second shaft tube, the docking boss is provided with a docking surface, an outer convex table surface and an inner convex table surface, a second outer retaining ring is embedded on the outer convex table surface of the docking boss, and a second inner retaining ring is embedded on the inner convex table surface of the docking boss.

[0011] Preferably, the outer edge of the welding surface of the first shaft tube is provided with a first outer compensating chamfer, the inner edge of the welding surface of the first shaft tube is provided with a first inner compensating chamfer, the outer edge of the welding surface of the second shaft tube is provided with a second outer compensating chamfer, and the inner edge of the welding surface of the second shaft tube is provided with a second inner compensating chamfer.

[0012] Preferably, surfaces of the first outer compensating chamfer, the first inner compensating chamfer, the second outer compensating chamfer and the second inner compensating chamfer are all in an inwardly concave arc shape.

[0013] Preferably, the first inner snap ring and the second inner snap ring correspond one-to-one, and the first outer snap ring and the second outer snap ring correspond one-to-one.

[0014] Preferably, a plurality of the first inner snap ring, the second inner snap ring, the first outer snap ring and the second outer snap ring are provided, and the first inner snap ring, the second inner snap ring, the first outer snap ring and the second outer snap ring are all kept coaxial with the first shaft tube and the second shaft tube.

[0015] Preferably, the inner peripheral side surface of the first inner retaining ring, the outer peripheral side surface of the first outer retaining ring, the outer peripheral side surface of the second inner retaining ring, and the inner peripheral side surface of the second outer retaining ring are all arc surfaces.

[0016] Preferably, the outer peripheral side surface of the first inner retaining ring is flush with the inner groove wall surface of the docking groove, the inner peripheral side surface of the first outer retaining ring is flush with the outer groove wall surface of the docking groove, the inner peripheral side surface of the second inner retaining ring is flush with the inner boss surface of the docking boss, and the outer peripheral side surface of the second outer retaining ring is flush with the outer boss surface of the docking boss.

[0017] Preferably, the inner circumferential side surface of the first inner retaining ring, the outer circumferential side surface of the first outer retaining ring, the outer circumferential side surface of the second inner retaining ring and the middle part of the inner circumferential side surface of the second outer retaining ring are fixedly connected with a plurality of positioning blocks, and the plurality of positioning blocks are evenly distributed at equal angles, and the outer groove wall surface and the inner groove wall surface of the docking groove and the outer boss surface and the inner boss surface of the docking boss are provided with positioning grooves corresponding to the positioning blocks.

[0018] Beneficial effects of the utility model:

[0019] (1) The first shaft tube is clamped by a moving slide, and the second shaft tube is clamped by a flywheel, and the first shaft tube and the second shaft tube are kept coaxial. The second shaft tube is first rotated around the axis by the flywheel, and then the first shaft tube is moved closer to the second shaft tube by the moving slide, so that the welding surface of the first shaft tube and the welding surface of the second shaft tube are butted and rubbed, and at the same time, the docking groove and the docking boss are butted and rubbed. During the friction, the groove bottom surface of the docking groove and the docking surface of the docking boss are butted and rubbed, the outer groove wall surface of the docking groove and the outer boss surface of the docking boss are butted and rubbed, the inner groove wall surface of the docking groove and the inner boss surface of the docking boss are butted and rubbed, and the first inner retaining ring and the second inner retaining ring are butted and rubbed. Butt friction, the first outer clamping ring and the second outer clamping ring are butt-frictioned, the friction interface is heated, and the metal in the welding zone undergoes radial plastic flow. When the temperature value of the welding zone reaches the expected temperature value, the upsetting brake is started, and the upsetting pressure is continued for a period of time. The welding is completed after the workpiece stops rotating. When the welding is completed, the first inner clamping ring and the second inner clamping ring and the first outer clamping ring and the second outer clamping ring are solid-phase welded to form a positioning clamping ring embedded in the first shaft tube and the second shaft tube. The weld formed between the first shaft tube and the second shaft tube after friction welding is used to tightly connect the first shaft tube and the second shaft tube, thereby improving the tensile strength of the weld.

[0020] (2) The butt joint of the circular butt joint groove and the butt joint boss facilitates clamping and centering, improves the coaxiality of the butt joint process and the welding process, and the weld formed by the butt joint groove and the butt joint boss after friction welding is U-shaped, so that the area of ​​the weld is increased compared with the flat head interface, thereby improving welding forming, improving welding quality and welding strength, and the first inner retaining ring, the second inner retaining ring, the first outer retaining ring and the second outer retaining ring are all provided with a plurality of them, and all remain coaxial with the first shaft tube and the second shaft tube, so that after the friction welding is completed, a plurality of positioning retaining rings are formed, further improving the overall The tensile strength of the body is improved. The corresponding clamping of the positioning clamp block and the positioning groove avoids slipping between the first inner clamp ring, the first outer clamp ring and the first shaft tube, and between the second inner clamp ring, the second outer clamp ring and the second shaft tube during the friction welding process, thereby improving the temperature increase speed and efficiency of the friction welding process, making the plastic deformation between the first inner clamp ring and the second inner clamp ring and between the first outer clamp ring and the second outer clamp ring more sufficient, so that the formed positioning clamp ring has a higher structural strength, and makes the connection between the positioning clamp ring and the first shaft tube and the second shaft tube tighter, and the clamping is more stable, thereby improving the tensile strength;

[0021] (3) During the top forging braking process, the plastically deformed metal moves to the first outer compensating chamfer, the second outer compensating chamfer, the first inner compensating chamfer and the second inner compensating chamfer to form a flash ring. By adjusting the cross-sectional dimensions of the first outer compensating chamfer, the first inner compensating chamfer, the second outer compensating chamfer and the second inner compensating chamfer, the size of the flash ring is controlled, the time for milling the outer surface of the flash ring is shortened, and the processing efficiency is improved. The flash ring cooperates with the weld to jointly improve the tensile strength and shear strength between the first shaft tube and the second shaft tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0024] Figure 2 It is a cross-sectional structural schematic diagram of the utility model;

[0025] Figure 3 for Figure 2 A magnified schematic diagram of the middle A area;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the first outer snap ring and the second inner snap ring of the utility model;

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the first inner clamping ring and the second outer clamping ring of the utility model;

[0028] Figure 6 It is a schematic cross-sectional structure diagram of a welded joint in an embodiment of the utility model;

[0029] Figure 7 For this utility model Figure 6 A magnified schematic diagram of the middle B area;

[0030] In the figure: 1. first shaft tube; 2. docking groove; 3. first outer compensating chamfer; 4. first inner compensating chamfer; 5. first inner retaining ring; 6. first outer retaining ring; 7. second shaft tube; 8. docking boss; 9. second outer compensating chamfer; 10. second inner compensating chamfer; 11. second inner retaining ring; 12. second outer retaining ring; 13. positioning block; 14. weld; 15. positioning retaining ring; 16. flash ring. DETAILED DESCRIPTION

[0031] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0032] See also Figure 1-7As shown: a lightweight motor shaft inertia friction welding embedded pre-compensation welding joint structure, including a first shaft tube 1 and a second shaft tube 7, the end faces of the first shaft tube 1 and the second shaft tube 7 close to each other are welding surfaces, a docking groove 2 is opened in the middle of the welding surface of the first shaft tube 1, the docking groove 2 is provided with a groove bottom surface, an outer groove wall surface and an inner groove wall surface, a first outer retaining ring 6 is embedded on the outer groove wall surface of the docking groove 2, a first inner retaining ring 5 is embedded on the inner groove wall surface of the docking groove 2, a docking boss 8 is fixedly connected to the middle of the welding surface of the second shaft tube 7, the docking boss 8 is provided with a docking surface, an outer convex table surface and an inner convex table surface, a second outer retaining ring 12 is embedded on the outer convex table surface of the docking boss 8, and a second inner retaining ring 11 is embedded on the inner convex table surface of the docking boss 8.

[0033] When this embodiment is working, the first shaft tube 1 is clamped by moving the slide, and the second shaft tube 7 is clamped by the flywheel, and the first shaft tube 1 and the second shaft tube 7 are kept coaxial, and the second shaft tube 7 is first rotated around the axis by the flywheel, and then the first shaft tube 1 is moved closer to the second shaft tube 7 by moving the slide, so that the welding surface of the first shaft tube 1 and the welding surface of the second shaft tube 7 are butted and rubbed, and at the same time, the docking groove 2 and the docking boss 8 are butted and rubbed. During the friction, the groove bottom surface of the docking groove 2 and the docking surface of the docking boss 8 are butted and rubbed, the outer groove wall surface of the docking groove 2 and the outer boss surface of the docking boss 8 are butted and rubbed, and the inner groove wall surface of the docking groove 2 and the inner boss surface of the docking boss 8 are butted and rubbed, and the first inner retaining ring 5 and the second inner retaining ring 5 are butted and rubbed. The ring 11 is butted and rubbed, the first outer clamping ring 6 and the second outer clamping ring 12 are butted and rubbed, the friction interface is heated, and the metal in the welding zone undergoes radial plastic flow. When the temperature value of the welding zone reaches the expected temperature value, the upsetting braking starts, and the upsetting pressure is continued for a period of time. The welding is completed after the workpiece stops rotating. When the welding is completed, the first inner clamping ring 5 and the second inner clamping ring 11 and the first outer clamping ring 6 and the second outer clamping ring 12 are solid-phase welded to form a positioning clamping ring 15 that is embedded in the first shaft tube 1 and the second shaft tube 7. The first shaft tube 1 and the second shaft tube 7 are tightly connected with the weld 14 formed between the first shaft tube 1 and the second shaft tube 7 after friction welding to improve the tensile strength of the weld.

[0034] At the same time, through the docking of the circular butt groove 2 and the butt boss 8, clamping and centering are facilitated, and the coaxiality of the butt joint process and the welding process is improved. The weld 14 formed by the butt groove 2 and the butt boss 8 after friction welding is U-shaped, so that the area of ​​the weld 14 is increased compared to the flat head interface, thereby improving welding forming, welding quality and welding strength.

[0035] The outer edge of the welding surface of the first shaft tube 1 is provided with a first outer compensation chamfer 3, the inner edge of the welding surface of the first shaft tube 1 is provided with a first inner compensation chamfer 4, the outer edge of the welding surface of the second shaft tube 7 is provided with a second outer compensation chamfer 9, and the inner edge of the welding surface of the second shaft tube 7 is provided with a second inner compensation chamfer 10;

[0036] When this embodiment is working, during the top forging braking process, the plastically deformed metal moves to the first outer compensating chamfer 3, the second outer compensating chamfer 9, the first inner compensating chamfer 4 and the second inner compensating chamfer 10 to form a flash ring 16. By adjusting the cross-sectional dimensions of the first outer compensating chamfer 3, the first inner compensating chamfer 4, the second outer compensating chamfer 9 and the second inner compensating chamfer 10, the size of the flash ring 16 is controlled, the time for milling the outer surface of the flash ring 16 is shortened, and the processing efficiency is improved.

[0037] The surfaces of the first outer compensating chamfer 3, the first inner compensating chamfer 4, the second outer compensating chamfer 9 and the second inner compensating chamfer 10 are all in an inwardly concave arc shape. This embodiment adopts a quarter arc, which is convenient for the plastically deformed metal to form a flash ring 16 in the first outer compensating chamfer 3, the first inner compensating chamfer 4, the second outer compensating chamfer 9 and the second inner compensating chamfer 10, and can accommodate the metal and increase the cross-sectional area of ​​the flash ring 16, control the size of the flash ring 16, and jointly improve the tensile strength and shear strength between the first shaft tube 1 and the second shaft tube 7 through the flash ring 16 and the weld 14.

[0038] The inner circumferential side surface of the first inner snap ring 5 , the outer circumferential side surface of the first outer snap ring 6 , the outer circumferential side surface of the second inner snap ring 11 and the inner circumferential side surface of the second outer snap ring 12 are all arc surfaces, and in this embodiment, the arc surface has an arc angle of half a circle.

[0039] The outer side surface of the first inner snap ring 5 is flush with the inner groove wall surface of the docking groove 2, the inner side surface of the first outer snap ring 6 is flush with the outer groove wall surface of the docking groove 2, the inner side surface of the second inner snap ring 11 is flush with the inner convex surface of the docking boss 8, and the outer side surface of the second outer snap ring 12 is flush with the outer convex surface of the docking boss 8. The melting points of the materials used for the first inner snap ring 5, the second inner snap ring 11, the first outer snap ring 6 and the second outer snap ring 12 are respectively lower than the melting points of the materials used for the first shaft tube 1 and the second shaft tube 7, which facilitates the first inner snap ring 5, the second inner snap ring 11, the first outer snap ring 6 and the second outer snap ring 12 to be fully plastically deformed and solid-phase welded together, thereby fully forming the positioning snap ring 15 and fully welding it to the first shaft tube 1 and the second shaft tube 7, thereby improving the overall tensile strength.

[0040] The first inner snap ring 5 and the second inner snap ring 11 correspond one to one, the first outer snap ring 6 and the second outer snap ring 12 correspond one to one, and there are multiple first inner snap rings 5, second inner snap rings 11, first outer snap rings 6 and second outer snap rings 12, and they all remain coaxial with the first shaft tube 1 and the second shaft tube 7, so that a plurality of positioning snap rings 15 are formed after the friction welding is completed, further improving the overall tensile strength.

[0041] The inner circumferential side surface of the first inner snap ring 5, the outer circumferential side surface of the first outer snap ring 6, the outer circumferential side surface of the second inner snap ring 11 and the middle part of the inner circumferential side surface of the second outer snap ring 12 are fixedly connected with a plurality of positioning blocks 13, and the plurality of positioning blocks 13 are evenly distributed at equal angles, and the outer groove wall surface and the inner groove wall surface of the docking groove 2 and the outer convex table surface and the inner convex table surface of the docking boss 8 are provided with positioning grooves corresponding to the positioning blocks 13. The corresponding engagement of the positioning blocks 13 and the positioning grooves can avoid the first Slippage occurs between the inner retaining ring 5, the first outer retaining ring 6 and the first shaft tube 1, and between the second inner retaining ring 11, the second outer retaining ring 12 and the second shaft tube 7, which increases the temperature increase speed and efficiency of the friction welding process, so that the plastic deformation between the first inner retaining ring 5 and the second inner retaining ring 11 and between the first outer retaining ring 6 and the second outer retaining ring 12 is more complete, and the formed positioning retaining ring 15 has a higher structural strength, and the connection between the positioning retaining ring 15 and the first shaft tube 1 and the second shaft tube 7 is tighter and the clamping is more stable, thereby improving the tensile strength.

[0042] When the utility model is in use, the first shaft tube 1 is clamped by a moving slide, and the second shaft tube 7 is clamped by a flywheel, and the first shaft tube 1 and the second shaft tube 7 are kept coaxial, and the second shaft tube 7 is first rotated around the axis by the flywheel, and then the first shaft tube 1 is moved closer to the second shaft tube 7 by a moving slide, so that the welding surface of the first shaft tube 1 and the welding surface of the second shaft tube 7 are butted and rubbed, and at the same time, the docking groove 2 and the docking boss 8 are butted and rubbed. During the friction, the groove bottom surface of the docking groove 2 and the docking surface of the docking boss 8 are butted and rubbed, the outer groove wall surface of the docking groove 2 and the outer boss surface of the docking boss 8 are butted and rubbed, and the inner groove wall surface of the docking groove 2 and the inner boss surface of the docking boss 8 are butted and rubbed, and the first inner clamping ring 5 and the second inner The clamping ring 11 is butted and rubbed, and the first outer clamping ring 6 and the second outer clamping ring 12 are butt-rubbed, the friction interface is heated, and the metal in the welding zone undergoes radial plastic flow. When the temperature value of the welding zone reaches the expected temperature value, the upsetting braking starts, and the upsetting pressure is continued for a period of time. The welding is completed after the workpiece stops rotating. When the welding is completed, the first inner clamping ring 5 and the second inner clamping ring 11 and the first outer clamping ring 6 and the second outer clamping ring 12 are solid-phase welded to form a positioning clamping ring 15 that is embedded in the first shaft tube 1 and the second shaft tube 7. The first shaft tube 1 and the second shaft tube 7 are tightly connected with the weld 14 formed between the first shaft tube 1 and the second shaft tube 7 after friction welding to improve the tensile strength of the weld.

[0043] The butt joint of the circular butt joint groove 2 and the butt joint boss 8 facilitates clamping and centering, improves the coaxiality of the butt joint process and the welding process, and the weld 14 formed by the butt joint groove 2 and the butt joint boss 8 after friction welding is U-shaped, so that the area of ​​the weld 14 is increased compared with the flat head interface, thereby improving welding forming, improving welding quality and welding strength, and the first inner clamp ring 5, the second inner clamp ring 11, the first outer clamp ring 6 and the second outer clamp ring 12 are all provided with a plurality of them, and all remain coaxial with the first shaft tube 1 and the second shaft tube 7, so that after the friction welding is completed, a plurality of positioning clamp rings 15 are formed, further improving the overall tensile strength. Strength: By correspondingly engaging the positioning block 13 and the positioning groove, slipping between the first inner snap ring 5, the first outer snap ring 6 and the first shaft tube 1, and between the second inner snap ring 11, the second outer snap ring 12 and the second shaft tube 7 during the friction welding process is avoided, and the temperature increase speed and efficiency of the friction welding process are improved, so that the plastic deformation between the first inner snap ring 5 and the second inner snap ring 11, and between the first outer snap ring 6 and the second outer snap ring 12 is more sufficient, and the formed positioning snap ring 15 has a higher structural strength, and the positioning snap ring 15 is more tightly connected to the first shaft tube 1 and the second shaft tube 7, and the engagement is more stable, thereby improving the tensile strength;

[0044] During the top forging braking process, the plastically deformed metal moves to the first outer compensating chamfer 3, the second outer compensating chamfer 9, the first inner compensating chamfer 4 and the second inner compensating chamfer 10 to form a flash ring 16. By adjusting the cross-sectional dimensions of the first outer compensating chamfer 3, the first inner compensating chamfer 4, the second outer compensating chamfer 9 and the second inner compensating chamfer 10, the size of the flash ring 16 is controlled, the time for milling the outer surface of the flash ring 16 is shortened, and the processing efficiency is improved. The flash ring 16 cooperates with the weld 14 to jointly improve the tensile strength and shear strength between the first shaft tube 1 and the second shaft tube 7.

[0045] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A lightweight motor shaft inertia friction welding embedded pre-compensation welding joint structure, comprising a first shaft tube (1) and a second shaft tube (7), characterized in that: The end surfaces of the first shaft tube (1) and the second shaft tube (7) that are close to each other are welding surfaces. A docking groove (2) is provided in the middle of the welding surface of the first shaft tube (1). The docking groove (2) is provided with a groove bottom surface, an outer groove wall surface and an inner groove wall surface. A first outer retaining ring (6) is embedded on the outer groove wall surface of the docking groove (2). A first inner retaining ring (5) is embedded on the inner groove wall surface of the docking groove (2). A docking boss (8) is fixedly connected in the middle of the welding surface of the second shaft tube (7). The docking boss (8) is provided with a docking surface, an outer boss surface and an inner boss surface. A second outer retaining ring (12) is embedded on the outer boss surface of the docking boss (8), and a second inner retaining ring (11) is embedded on the inner boss surface of the docking boss (8).

2. According to claim 1, a lightweight motor shaft inertia friction welding embedded pre-compensation welding joint structure is characterized in that: The outer edge of the welding surface of the first shaft tube (1) is provided with a first outer compensating chamfer (3), the inner edge of the welding surface of the first shaft tube (1) is provided with a first inner compensating chamfer (4), the outer edge of the welding surface of the second shaft tube (7) is provided with a second outer compensating chamfer (9), and the inner edge of the welding surface of the second shaft tube (7) is provided with a second inner compensating chamfer (10).

3. According to claim 2, a lightweight motor shaft inertia friction welding embedded pre-compensation welding joint structure is characterized in that: The surfaces of the first outer compensating chamfer (3), the first inner compensating chamfer (4), the second outer compensating chamfer (9) and the second inner compensating chamfer (10) are all in the shape of an inwardly concave arc.

4. According to claim 1, a lightweight motor shaft inertia friction welding embedded pre-compensation welding joint structure is characterized in that: The first inner snap ring (5) and the second inner snap ring (11) correspond one to one, and the first outer snap ring (6) and the second outer snap ring (12) correspond one to one.

5. According to claim 1, a lightweight motor shaft inertia friction welding embedded pre-compensation welding joint structure is characterized in that: The first inner snap ring (5), the second inner snap ring (11), the first outer snap ring (6) and the second outer snap ring (12) are each provided in plurality, and the first inner snap ring (5), the second inner snap ring (11), the first outer snap ring (6) and the second outer snap ring (12) are all kept coaxial with the first shaft tube (1) and the second shaft tube (7).

6. The lightweight motor shaft inertia friction welding embedded pre-compensation welding joint structure according to claim 1 is characterized in that: The inner peripheral side surface of the first inner snap ring (5), the outer peripheral side surface of the first outer snap ring (6), the outer peripheral side surface of the second inner snap ring (11) and the inner peripheral side surface of the second outer snap ring (12) are all arc surfaces.

7. The lightweight motor shaft inertia friction welding embedded pre-compensation welding joint structure according to claim 1 is characterized in that: The outer peripheral side surface of the first inner retaining ring (5) is flush with the inner groove wall surface of the docking groove (2), the inner peripheral side surface of the first outer retaining ring (6) is flush with the outer groove wall surface of the docking groove (2), the inner peripheral side surface of the second inner retaining ring (11) is flush with the inner convex surface of the docking boss (8), and the outer peripheral side surface of the second outer retaining ring (12) is flush with the outer convex surface of the docking boss (8).

8. The lightweight motor shaft inertia friction welding embedded pre-compensation welding joint structure according to claim 1 is characterized in that: The inner circumferential side surface of the first inner retaining ring (5), the outer circumferential side surface of the first outer retaining ring (6), the outer circumferential side surface of the second inner retaining ring (11) and the middle part of the inner circumferential side surface of the second outer retaining ring (12) are all fixedly connected with a plurality of positioning blocks (13), and the plurality of positioning blocks (13) are evenly distributed at equal angles, and the outer groove wall surface and the inner groove wall surface of the docking groove (2) and the outer convex table surface and the inner convex table surface of the docking boss (8) are all provided with positioning grooves corresponding to the positioning blocks (13).

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