High-strength long-life turbocharger rotor shaft

Abstract

The utility model belongs to turbocharging rotor shaft technical field, concretely relates to a high strength long life turbocharging rotor shaft, this high strength long life turbocharging rotor shaft, including hollow shaft, the inner wall fixedly connected with threaded cylinder of hollow shaft, the inner wall threaded connection has first bolt of threaded cylinder, the first recess is set up to the end of first bolt, the inner wall fixedly connected with fixed cylinder of first recess, the surface fixedly connected with cylinder of hollow shaft. This high strength long life turbocharging rotor shaft passes through the wear -resisting axle sleeve made of superfine grain tungsten carbide alloy that sets up by axle journal section, makes this turbocharging rotor shaft have stronger wear resistance, simultaneously, through the cooperation of threaded cylinder, first bolt, first recess, fixed cylinder, cylinder, fixed ring, first square hole, second square hole and fixed square column, makes the wear -resisting axle sleeve on this turbocharging rotor shaft can be individually disassembled.

Description

Technical Field

[0001] This utility model belongs to the technical field of turbocharger rotor shafts, specifically relating to a high-strength, long-life turbocharger rotor shaft. Background Technology

[0002] As a core component for improving the power and reducing energy consumption of internal combustion engines, the turbocharging system's rotor shaft is a key transmission component that realizes the conversion of "exhaust gas energy - mechanical kinetic energy - intake air boosting". It is widely used in engines in automobiles, ships, construction machinery and other fields.

[0003] Most existing rotor shafts increase their wear resistance by adding wear-resistant bushings to the journal section. However, these bushings are usually rigidly connected to the shaft body by interference fit or laser welding and cannot be disassembled and replaced separately. Once the wear-resistant bushing wears out, the entire rotor shaft assembly needs to be replaced, which not only significantly increases maintenance costs but also wastes a lot of metal materials.

[0004] When the rotor shaft rotates at high speed, even a tiny mass eccentricity (such as 0.1g) can generate a vibration load of tens of Newtons. Therefore, dynamic balancing calibration is required by adding a balance weight. In existing technologies, the balance weight is mainly fixed to the shaft surface by arc welding or resistance welding. During the welding process, the local high temperature (up to 1500℃ or above) will cause the shaft material to have coarse grains and concentrated thermal stress, which will damage the original mechanical properties of the shaft (such as a 20%-30% decrease in fatigue strength) and create a potential risk of fracture. At the same time, the welded balance weight cannot be easily disassembled and adjusted. If the dynamic balance needs to be recalibrated later due to wear, detachment, or changes in operating conditions (such as engine power adjustment), the old balance weight needs to be ground off the shaft surface and a new balance weight needs to be welded on. This operation is complicated and can easily cause secondary damage to the shaft surface. Utility Model Content

[0005] The purpose of this invention is to provide a high-strength, long-life turbocharger rotor shaft, solving two major technical problems of existing turbocharger rotor shafts: First, the wear-resistant bushings of existing rotor shafts are mostly rigidly connected to the shaft body through interference fit or laser welding, and cannot be disassembled and replaced separately. Once the wear-resistant bushing wears out, the entire rotor shaft assembly needs to be replaced, resulting in a significant increase in maintenance costs and serious waste of metal materials. Second, the balance blocks of existing rotor shafts are fixed by arc welding or resistance welding. During the welding process, the local high temperature (up to 1500℃ or above) will cause the shaft material to have coarse grains and concentrated thermal stress, which will damage the original mechanical properties of the shaft (such as a 20%-30% decrease in fatigue strength) and pose a risk of breakage. At the same time, the welded balance blocks are difficult to disassemble and adjust later. When recalibrating the dynamic balance, the old balance blocks need to be ground off, which can easily cause secondary damage to the shaft surface.

[0006] The specific technical solution adopted by this utility model is as follows:

[0007] A high-strength, long-life turbocharger rotor shaft includes a hollow shaft. A threaded cylinder is fixedly connected to the inner wall of the hollow shaft. A first bolt is threadedly connected to the inner wall of the threaded cylinder. A first groove is formed at the end of the first bolt. A fixed cylinder is fixedly connected to the inner wall of the first groove. A cylinder is fixedly connected to the surface of the hollow shaft. A wear-resistant bushing is fitted onto the surface of the hollow shaft. The left and right sides of the cylinder are in contact with the sides of the wear-resistant bushing. A connecting groove is formed on the inner wall of the wear-resistant bushing. Connecting posts are fixedly connected to the surface of the hollow shaft and the left and right sides of the cylinder. The surface of the connecting posts is in contact with the inner wall of the connecting groove. A fixing ring is fitted onto the surface of the hollow shaft. The side of the wear-resistant bushing is in contact with the side of the fixing ring. First square holes are formed on the upper and lower sides of the fixing ring. Second square holes are formed on the upper and lower sides of the hollow shaft. Fixed square posts are fitted into the inner walls of the first and second square holes. Fixed holes are formed inside the fixed square posts. The inner wall of the fixed holes is in contact with the surface of the fixed cylinder.

[0008] The present invention is further configured such that the axis of the first bolt coincides with the axis of the fixed cylinder, and the depth of the first groove is less than the length of the fixed cylinder.

[0009] The present invention is further configured such that an annular groove is formed on the surface of the cylinder, a semi-circular plate is fixedly connected to the inner wall of the annular groove, a threaded hole is formed inside the semi-circular plate, and balance blocks are attached to the left and right sides of the surface of the semi-circular plate and the inner wall of the annular groove. A stepped hole is formed inside the balance block, and a second bolt is provided on the inner wall of the stepped hole. The surface of the second bolt is threadedly connected to the inner wall of the threaded hole.

[0010] The present invention is further configured such that positioning grooves are provided on both the left and right sides of the balance block, and positioning blocks are fixedly connected to both the left and right sides of the inner wall of the annular groove, with the surface of the positioning block fitting against the inner wall of the positioning groove.

[0011] The present invention is further configured such that a conical block is fixedly connected to the end of the first bolt, the axis of the conical block coincides with the axis of the first bolt, and the large circle diameter of the conical block is equal to the diameter of the first bolt.

[0012] The present invention is further provided that a second groove is provided on the side of the wear-resistant bushing near the cylinder.

[0013] The technical effects achieved by this utility model are as follows:

[0014] This invention relates to a high-strength, long-life turbocharger rotor shaft. The journal section is fitted with a wear-resistant bushing made of ultra-fine-grained tungsten carbide alloy, giving the turbocharger rotor shaft strong wear resistance. Furthermore, the engagement of a threaded cylinder, a first bolt, a first groove, a fixing cylinder, a cylindrical section, a fixing ring, a first square hole, a second square hole, and a fixing square post allows the wear-resistant bushing on the turbocharger rotor shaft to be individually disassembled and installed. This means that after wear, only the wear-resistant bushing needs to be replaced, eliminating the need to scrap the entire rotor shaft and significantly extending its overall service life.

[0015] The high-strength, long-life turbocharger rotor shaft of this utility model, through the cooperation of a semi-circular plate, threaded hole, balance block, stepped hole and second bolt, allows maintenance personnel to complete the disassembly and assembly of the balance block by simply rotating the second bolt, thereby avoiding the thermal damage to the shaft caused by welding the balance block, and making the subsequent maintenance process simpler. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 yes Figure 1 Sectional view at point BB;

[0019] Figure 4 yes Figure 1 Sectional view at CC;

[0020] Figure 5 This is a top view of the hollow shaft in this utility model;

[0021] Figure 6 This is a front view of the hollow shaft in this utility model;

[0022] Figure 7 This is a side view of the hollow shaft in this utility model;

[0023] Figure 8 This is a side view of the first bolt in this utility model;

[0024] Figure 9 This is a front view of the wear-resistant bushing in this utility model;

[0025] Figure 10 This is a side view of the wear-resistant bushing in this utility model;

[0026] Figure 11 This is a top view of the fixing ring in this utility model;

[0027] Figure 12This is a side view of the fixed square column in this utility model;

[0028] Figure 13 This is a side view of the semicircular plate in this utility model;

[0029] Figure 14 This is a schematic diagram of the balance block in this utility model.

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 1. Hollow shaft; 2. Threaded cylinder; 3. First bolt; 4. First groove; 5. Fixed cylinder; 6. Cylinder; 7. Wear-resistant bushing; 8. Connecting groove; 9. Connecting column; 10. Fixing ring; 11. First square hole; 12. Second square hole; 13. Fixed square column; 14. Fixing hole; 15. Annular groove; 16. Semicircular plate; 17. Threaded hole; 18. Balance block; 19. Stepped hole; 20. Second bolt; 21. Positioning groove; 22. Positioning block; 23. Conical block; 24. Second groove. Detailed Implementation

[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] like Figures 1 to 12As shown, a high-strength, long-life turbocharger rotor shaft includes a hollow shaft 1. A threaded cylinder 2 is fixedly connected to the inner wall of the hollow shaft 1. A first bolt 3 is threadedly connected to the inner wall of the threaded cylinder 2. A first groove 4 is formed at the end of the first bolt 3. A fixing cylinder 5 is fixedly connected to the inner wall of the first groove 4. A cylinder 6 is fixedly connected to the surface of the hollow shaft 1. A wear-resistant bushing 7 is fitted onto the surface of the hollow shaft 1. The left and right sides of the cylinder 6 are in contact with the sides of the wear-resistant bushing 7. A connecting groove 8 is formed on the inner wall of the wear-resistant bushing 7. Connecting columns are fixedly connected to the surface of the hollow shaft 1 and the left and right sides of the cylinder 6. 9. The surface of the connecting post 9 is in contact with the inner wall of the connecting groove 8. The surface of the hollow shaft 1 is fitted with a fixing ring 10. The side of the wear-resistant bushing 7 is in contact with the side of the fixing ring 10. The upper and lower sides of the fixing ring 10 are provided with first square holes 11. The upper and lower sides of the hollow shaft 1 are provided with second square holes 12. The inner walls of the first square holes 11 and the inner walls of the second square holes 12 are in contact with a fixing square post 13. The inside of the fixing square post 13 is provided with a fixing hole 14. The inner wall of the fixing hole 14 is in contact with the surface of the fixing cylinder 5. The side of the wear-resistant bushing 7 near the cylinder 6 is provided with a second groove 24.

[0035] In this design, the axis of the first bolt 3 coincides with the axis of the fixed cylinder 5, the depth of the first groove 4 is less than the length of the fixed cylinder 5, and a conical block 23 is fixedly connected to the end of the first bolt 3. The axis of the conical block 23 coincides with the axis of the first bolt 3, and the large circle diameter of the conical block 23 is equal to the diameter of the first bolt 3.

[0036] It should be noted that, through the cooperation of the first bolt 3 and the threaded sleeve 2, maintenance personnel can insert or remove the fixing cylinder 5 into or from the fixing hole 14 by rotating the first thread. When the fixing cylinder 5 is inserted into the fixing hole 14, the cooperation between the fixing cylinder 5 and the fixing hole 14 prevents the fixing square post 13 from being removed from the first square hole 11 and the second square hole 12. Furthermore, through the cooperation of the first square hole 11, the second square hole 12, and the fixing square post 13, the fixing ring 10 can be fixed in place. The wear-resistant bushing 7 can be fixed on the hollow shaft 1 by the cooperation of the fixing ring 10 and the cylinder 6. After the fixing cylinder 5 is separated from the fixing hole 14, the fixing square post 13 can be pulled out from the first square hole 11 and the second square hole 12, so that the fixing ring 10 and the wear-resistant bushing 7 can slide freely on the hollow shaft 1. After the wear-resistant bushing 7 is stuck on the hollow shaft 1, the second groove 24 on the wear-resistant bushing 7 allows the maintenance personnel to use a puller to remove the wear-resistant bushing 7 from the hollow shaft 1.

[0037] Through the cooperation of the connecting column 9 and the connecting groove 8, the wear-resistant bushing 7 can rotate synchronously with the hollow shaft 1. Through the conical block 23, when the fixed cylinder 5 is inserted into the fixed hole 14, even if there is a slight offset between the fixed cylinder 5 and the fixed hole 14, the fixed cylinder 5 can be smoothly inserted into the fixed hole 14.

[0038] like Figures 1 to 14 As shown, an annular groove 15 is formed on the surface of the cylinder 6. A semi-circular plate 16 is fixedly connected to the inner wall of the annular groove 15. A threaded hole 17 is formed inside the semi-circular plate 16. Balance blocks 18 are attached to the left and right sides of the surface of the semi-circular plate 16 and the inner wall of the annular groove 15. A stepped hole 19 is formed inside the balance block 18. A second bolt 20 is provided on the inner wall of the stepped hole 19. The surface of the second bolt 20 is threadedly connected to the inner wall of the threaded hole 17.

[0039] The balance block 18 has positioning grooves 21 on both the left and right sides, and positioning blocks 22 are fixedly connected to both the left and right sides of the inner wall of the annular groove 15. The surface of the positioning block 22 is in contact with the inner wall of the positioning groove 21.

[0040] It should be noted that, through the cooperation of the semi-circular plate 16, threaded hole 17, balance block 18, stepped hole 19 and second bolt 20, maintenance personnel only need to rotate the second bolt 20 to complete the disassembly and assembly of the balance block 18, thereby avoiding thermal damage to the shaft caused by welding the balance block 18, and making the subsequent maintenance process simpler. Through the cooperation of the positioning block 22 and the positioning groove 21, maintenance personnel can quickly and accurately align the stepped hole 19 with the threaded hole 17.

[0041] The working principle of this utility model is as follows: When it is necessary to replace the wear-resistant bushing 7, firstly, by rotating the first bolt 3, the fixed cylinder 5 is moved out of the fixed hole 14. Then, the fixed square column 13 is pulled out from the first square hole 11 and the second square hole 12. After the fixed square column 13 is separated from the fixed ring 10, the wear-resistant bushing 7 and the fixed ring 10 can be directly removed from the hollow shaft 1.

[0042] Then, the new wear-resistant bushing 7 is fitted onto the hollow shaft 1, and the connecting post 9 is made to fit into the connecting groove 8. At this time, through the cooperation of the connecting post 9 and the connecting groove 8, the wear-resistant bushing 7 can rotate synchronously with the hollow shaft 1. Then, the fixing ring 10 is fitted onto the hollow shaft 1, and the fixing square post 13 is inserted into the first square hole 11 and the second square hole 12. Then, by rotating the first bolt 3, the fixing cylinder 5 is inserted into the fixing hole 14. At this time, through the cooperation of the fixing cylinder 5 and the fixing hole 14, the fixing square post 13 cannot be moved out of the first square hole 11 and the second square hole 12. Through the cooperation of the first square hole 11, the second square hole 12 and the fixing square post 13, the fixing ring 10 can be fixed onto the hollow shaft 1. At the same time, through the cooperation of the fixing ring 10 and the cylinder 6, the wear-resistant bushing 7 can be fixed onto the hollow shaft 1.

[0043] When it is necessary to change the weight and position of the balance block 18, first, by rotating the second bolt 20, the second bolt 20 is separated from the threaded hole 17. Then, the original balance block 18 is removed from the semi-circular plate 16, and the balance block 18 of the specified weight is placed in the specified position. Then, the second bolt 20 is inserted into the stepped hole 19 and screwed into the threaded hole 17. At this time, the balance block 18 of the specified weight can be fixed in the specified position by the cooperation of the second thread and the threaded hole 17.

[0044] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A high-strength, long-life turbocharger rotor shaft, characterized in that: The assembly includes a hollow shaft (1), a threaded cylinder (2) fixedly connected to the inner wall of the hollow shaft (1), a first bolt (3) threadedly connected to the inner wall of the threaded cylinder (2), a first groove (4) provided at the end of the first bolt (3), a fixed cylinder (5) fixedly connected to the inner wall of the first groove (4), a cylinder (6) fixedly connected to the surface of the hollow shaft (1), a wear-resistant bushing (7) fitted onto the surface of the hollow shaft (1), the left and right sides of the cylinder (6) fitting against the sides of the wear-resistant bushing (7), a connecting groove (8) provided on the inner wall of the wear-resistant bushing (7), and the surface of the hollow shaft (1) and the left and right sides of the cylinder (6) fixedly connected. A connecting post (9) is connected, the surface of the connecting post (9) is in contact with the inner wall of the connecting groove (8), a fixing ring (10) is sleeved on the surface of the hollow shaft (1), the side of the wear-resistant bushing (7) is in contact with the side of the fixing ring (10), a first square hole (11) is opened on both the upper and lower sides of the fixing ring (10), a second square hole (12) is opened on both the upper and lower sides of the hollow shaft (1), a fixing square post (13) is in contact with the inner wall of the first square hole (11) and the inner wall of the second square hole (12), a fixing hole (14) is opened inside the fixing square post (13), and the inner wall of the fixing hole (14) is in contact with the surface of the fixing cylinder (5).

2. The high-strength, long-life turbocharger rotor shaft according to claim 1, characterized in that: The axis of the first bolt (3) coincides with the axis of the fixed cylinder (5), and the depth of the first groove (4) is less than the length of the fixed cylinder (5).

3. The high-strength, long-life turbocharger rotor shaft according to claim 1, characterized in that: The surface of the cylinder (6) is provided with an annular groove (15), and a semi-circular plate (16) is fixedly connected to the inner wall of the annular groove (15). A threaded hole (17) is provided inside the semi-circular plate (16). A balance block (18) is attached to both the surface of the semi-circular plate (16) and the left and right sides of the inner wall of the annular groove (15). A stepped hole (19) is provided inside the balance block (18), and a second bolt (20) is provided on the inner wall of the stepped hole (19). The surface of the second bolt (20) is threadedly connected to the inner wall of the threaded hole (17).

4. The high-strength, long-life turbocharger rotor shaft according to claim 3, characterized in that: The balance block (18) has positioning grooves (21) on both the left and right sides. The inner walls of the annular groove (15) are fixedly connected to positioning blocks (22) on both the left and right sides. The surface of the positioning block (22) is in contact with the inner wall of the positioning groove (21).

5. The high-strength, long-life turbocharger rotor shaft according to claim 1, characterized in that: A conical block (23) is fixedly connected to the end of the first bolt (3). The axis of the conical block (23) coincides with the axis of the first bolt (3), and the large circle diameter of the conical block (23) is equal to the diameter of the first bolt (3).

6. The high-strength, long-life turbocharger rotor shaft according to claim 1, characterized in that: The wear-resistant bushing (7) has a second groove (24) on the side near the cylinder (6).

Images