A kind of drive device assembly method based on harmonic electric locomotive reduces grinding

Abstract

The application provides a kind of based on harmonic electric locomotive drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method for reducing the drive device assembly method

Description

Technical Field

[0001] This invention belongs to the field of electric locomotive drive device assembly technology, and more specifically, relates to a drive device assembly method based on a Harmony-type electric locomotive to reduce friction. Background Technology

[0002] HX D The Type 3 electric locomotive is a 7200kW AC drive, six-axle mainline passenger and freight electric locomotive, and is currently one of the main freight locomotive models used on Chinese railways. (HX) D The wheel axle drive system of the Type 3 electric locomotive employs a single-sided helical gear rolling bearing structure. A single-piece cast gearbox with upper and lower sections provides sealing protection for the transmission system. The gearbox assembly mainly includes components such as the upper gearbox body, lower gearbox body, observation window, labyrinth ring, sealing ring, and labyrinth cover. The inner side of the gearbox assembly is fixed to the axle housing with connecting bolts, while the outer side uses a sealing ring structure to achieve motion sealing between the axle and the gearbox. Three leveling screws are used to adjust the gearbox installation position, ensuring vertical assembly and a good seal.

[0003] HX D To ensure proper gearbox oil lubrication, the sealing structure design of the Type 3 electric locomotive drive unit is relatively complex, and the HX... D All three types of electric locomotives are heavy-haul freight locomotives, therefore their driven gears in the wheel axle drive system bear significant loads. This leads to frequent labyrinth structure contact accidents at the driven gear sealing area, which can be broadly categorized into three situations: contact between the inner labyrinth ring of the driven gear and the axle housing; contact between the outer labyrinth ring of the driven gear and the sealing ring and labyrinth cover; and contact between the sealing ring and the outer end face of the driven gear hub hole. Labyrinth structure contact accidents in the drive system cause the drive system to malfunction, affecting the locomotive's service life and forcing the drive system to enter its maintenance phase prematurely. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a method for assembling a drive unit to reduce friction during operation of a Harmony-type electric locomotive, thus solving the problem of how to reduce the probability of friction during operation of the drive unit of a Harmony-type electric locomotive.

[0005] To achieve the above objectives, the present invention provides an assembly method for a drive device to reduce friction on a Harmony-type electric locomotive, comprising: Before assembling the inner labyrinth ring, the runout of the driven gear labyrinth ring seat is measured, and its circumferential runout and end face runout are respectively less than the first runout setting value and the second runout setting value. Before the heat treatment of the inner labyrinth ring and the driven gear labyrinth ring seat, the outer diameter of the inner labyrinth ring is measured to obtain the first outer diameter measurement value. During the heat fitting process of the inner labyrinth ring and the driven gear labyrinth ring seat, the inner labyrinth ring is rotated to make it axially close to the driven gear labyrinth ring seat, and then pressure is maintained by a pressure fixture until the room temperature is restored and the pressure fixture is removed. After the inner labyrinth ring and the driven gear labyrinth ring seat are heated for hot fitting, the outer diameter of the inner labyrinth ring is measured to obtain the second outer diameter measurement value, and the first assembly interference is determined based on the first outer diameter measurement value and the second outer diameter measurement value. After the inner labyrinth ring and the driven gear labyrinth ring seat are heated for thermal assembly, the runout of the inner labyrinth ring is measured, and its circumferential runout is made less than the third runout setting value. Before assembling the axle box, inspect the shape and size of the labyrinth section of the axle box.

[0006] Optionally, the axle equipped with the driven gear is placed on a lathe, and the runout of the labyrinth ring seat of the driven gear is measured.

[0007] Optionally, both the first runout setting and the second runout setting are 0.02 mm.

[0008] Optionally, the first assembly interference is 0.07-0.1mm.

[0009] Optionally, after removing the pressure fixture, the axial clearance between the inner labyrinth ring and the driven gear labyrinth ring seat is checked using a feeler gauge, ensuring that a 0.02mm feeler gauge cannot be inserted.

[0010] Optionally, detecting the shape and size of the labyrinth region of the bearing housing includes: Insert the annular detection fixture into the annular groove of the labyrinth part of the bearing box, and ensure that the annular detection fixture can rotate smoothly. The smoothly rotating annular detection fixture is placed against the inner wall of the annular groove in different directions. The gap between the opposite side of the annular detection fixture and the inner wall of the annular groove is measured by a feeler gauge, and the gap is ensured to be no less than the set gap value.

[0011] Optionally, the gap setting value is 0.5mm.

[0012] Optionally, it also includes: Before assembling the outer labyrinth ring, its inner diameter is measured and machined to ensure that the second assembly interference of its inner diameter after machining is 0.05-0.07 mm.

[0013] Optionally, it also includes: After assembling the outer labyrinth ring, measure the distance between the end face of the outer labyrinth ring and the end face of the axle wheel seat, and ensure that the distance is 239.4-239.6mm.

[0014] Optionally, it also includes: Before assembling the sealing ring, the dimensions of the sealing ring are measured to avoid original machining deviations.

[0015] This invention provides an assembly method for a drive unit that reduces wear and tear on a Harmony-type electric locomotive. The advantages are as follows: This assembly method is based on the discovery of uneven wear within the drive unit of the Harmony-type electric locomotive. After analyzing the uneven wear, the method first improves the assembly process to address the wear between the inner labyrinth ring of the driven gear and the axle housing. To reduce the impact of circumferential and lateral runout of the inner labyrinth ring on the labyrinth clearance after assembly, runout of the labyrinth ring seat is measured before assembling the inner labyrinth ring. A first runout setting value and a second runout setting value are set to limit the aforementioned runout. Considering the influence of temperature on the dimensions of the inner labyrinth ring during its heat-fit assembly into the labyrinth ring seat, the outer diameter of the inner labyrinth ring is measured before and after heating. Based on the first and second outer diameter measurements obtained before and after heating... The first assembly interference was re-determined to ensure that the inner labyrinth ring would not experience radial movement and to avoid excessive changes in the labyrinth size. Considering the potential deformation of the inner labyrinth ring after it has returned to room temperature after hot assembly, it was rotated during the hot assembly process to ensure axial contact with the driven gear labyrinth ring seat. A pressure-pressurizing fixture was then used to maintain pressure until it returned to room temperature, at which point the fixture was removed to ensure the inner labyrinth ring did not shift with temperature changes. To reduce the impact of the inner labyrinth ring's circumferential runout on the labyrinth mating clearance after hot assembly, its circumferential runout was measured, and a third runout setting value was set to limit this runout. To ensure that the dimensional clearance between the labyrinth portion of the axle box and the inner labyrinth ring meets the requirements after axle box assembly, the dimensions of the labyrinth portion were measured before axle box assembly. Through these series of process measures, the labyrinth clearance was ensured to be sufficient and stable, reducing the occurrence of grinding accidents.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0018] Figure 1 A flowchart is shown below illustrating an assembly method for a drive device based on a Harmony-type electric locomotive to reduce friction, according to an embodiment of the present invention.

[0019] Figure 2A partial schematic diagram of the assembly structure of the drive unit of the Harmony type electric locomotive is shown.

[0020] Figure 3 A schematic diagram of the assembly structure of the drive unit for the Harmony type electric locomotive is shown.

[0021] Explanation of reference numerals in the attached figures: 1. Inner labyrinth ring; 2. Driven gear; 3. Axle housing; 4. Axle; 5. Bearing housing; 6. Sealing ring; 7. Labyrinth cover; 8. Outer labyrinth ring; 9. Gearbox. Detailed Implementation

[0022] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0023] like Figure 1 As shown, the present invention provides an assembly method for a drive device to reduce friction on a Harmony-type electric locomotive, comprising: Before assembling the inner labyrinth ring 1, the runout of the driven gear labyrinth ring seat is measured, and its circumferential runout and end face runout are respectively less than the first runout setting value and the second runout setting value. Before the heat treatment of the inner labyrinth ring 1 and the driven gear labyrinth ring seat, the outer diameter of the inner labyrinth ring 1 is measured to obtain the first outer diameter measurement value. During the heat fitting process of the inner labyrinth ring 1 and the driven gear labyrinth ring seat, the inner labyrinth ring 1 is rotated to make it axially close to the driven gear labyrinth ring seat, and then pressure is maintained by a pressure fixture until the room temperature is restored and the pressure fixture is removed. After the inner labyrinth ring 1 and the driven gear labyrinth ring seat are heated for hot fitting, the outer diameter of the inner labyrinth ring 1 is measured to obtain the second outer diameter measurement value, and the first assembly interference is determined based on the first outer diameter measurement value and the second outer diameter measurement value. After the inner labyrinth ring 1 and the driven gear labyrinth ring seat are heated, the runout of the inner labyrinth ring 1 is measured and its circumferential runout is less than the third runout setting value. Before assembling the bearing housing 3, the shape and size of the labyrinth section of the bearing housing 3 are inspected.

[0024] Specifically, to address the problem of reducing the probability of wear and tear on the drive unit during the operation of Harmony-type electric locomotives, this invention provides a drive unit assembly method for reducing wear and tear on Harmony-type electric locomotives. Based on the discovery of areas experiencing uneven wear within the drive unit of Harmony-type electric locomotives, and after analyzing the uneven wear situation, the assembly process is first improved to address the wear and tear between the inner labyrinth ring 1 of the driven gear 2 and the axle housing 3. To reduce the impact of circumferential and lateral runout of the inner labyrinth ring 1 after assembly on the labyrinth ring seat of the driven gear on the labyrinth clearance, runout measurement of the driven gear labyrinth ring seat is performed before assembling the inner labyrinth ring 1. A first runout setting value and a second runout setting value are set to limit the aforementioned runout. Considering the influence of temperature on the dimensions of the inner labyrinth ring 1 during its heat-fitting assembly onto the driven gear labyrinth ring seat, the outer diameter of the inner labyrinth ring 1 is measured before and after heating, and the results are then used to refine the assembly process. A new first assembly interference fit is determined to ensure that the inner labyrinth ring 1 will not experience radial movement and to avoid excessive changes in the labyrinth size of the inner labyrinth ring 1. Considering that the inner labyrinth ring 1 will have a certain amount of deformation after being hot-fitted and returning to room temperature, it is rotated during the hot-fitting process to ensure that it is axially in close contact with the driven gear labyrinth ring seat, and then pressure is maintained using an axial pressure fixture until it returns to room temperature. After the pressure fixture is removed, it is ensured that the inner labyrinth ring 1 does not shift with temperature changes. In order to reduce the impact of the circumferential runout of the inner labyrinth ring 1 on the labyrinth mating clearance after hot-fitting, its circumferential runout is measured after hot-fitting, and the runout is limited by setting a third runout setting value. In order to ensure that the dimensional clearance between the labyrinth part of the bearing housing 3 and the inner labyrinth ring 1 meets the requirements after the bearing housing 3 is assembled, the dimensions of the labyrinth part are also measured before the bearing housing 3 is assembled. Through the above series of process measures, the labyrinth clearance is ensured to be sufficient and stable, reducing the occurrence of grinding accidents.

[0025] Furthermore, with HX D Taking the assembly of the drive unit of a Type 3 electric locomotive as an example, such as Figure 2As shown, the inner labyrinth ring 1 is assembled to the driven gear labyrinth ring seat by heat fitting. The inner labyrinth ring 1 and the driven gear labyrinth ring seat are interference fit, with the original interference setting being 0.031~0.103mm. The axle housing 3 is assembled to the axle 4 via the axle bearing 5. The labyrinth part of the axle housing 3 and the inner labyrinth ring 1 cooperate with each other to form a sealed structure, ensuring that no impurities or foreign objects enter the gear and bearing lubrication during locomotive operation. When the inner labyrinth ring 1 inside the drive unit of the HXD3 electric locomotive rubs against the labyrinth part of the axle housing 3, the axle temperature alarm device shows that the bearing temperature is high, causing abnormal temperature rise of the bearing in the axle housing 3. Due to friction, the labyrinth ring 1 deforms, curls, and melts together. The heat generated by friction causes its inner hole to expand, reducing the interference fit between the labyrinth ring and the driven gear labyrinth ring seat, resulting in displacement of the labyrinth ring. The labyrinth part of the axle housing 3 also deforms, curls, melts together, and turns black or blue due to friction. This invention first calculates the axial and radial clearances between the labyrinth of the axle housing 3 and the inner labyrinth ring 1 based on the design dimensions. Then, it analyzes the causes of friction accidents and then uses the above-mentioned assembly method of the drive device for reducing friction based on the Harmony electric locomotive to optimize the process, ensuring the labyrinth clearance and reducing the probability of friction.

[0026] Optionally, the axle 4 equipped with the driven gear 2 is placed on a lathe, and the runout of the labyrinth ring seat of the driven gear is measured.

[0027] Specifically, for measuring the runout of the driven gear labyrinth ring seat, whether it is a new work or a repair, the driven gear 2 can be placed on the lathe with the axle 4 assembled, which is convenient for measurement operation.

[0028] Optionally, both the first runout setting and the second runout setting are 0.02 mm.

[0029] Specifically, by setting the first and second jump values, the influence of the inner labyrinth ring 1 on the labyrinth clearance when it is assembled on the driven gear 2 can be effectively reduced.

[0030] Optionally, the first assembly interference is 0.07-0.1mm.

[0031] Specifically, the difference between the second outer diameter measurement and the first outer diameter measurement should be within the set threshold range and should not be too large. Since the first assembly interference is proportional to the outer diameter deformation, the first assembly interference should not be too large. In addition, the first assembly interference should not be too small. Sufficient interference is needed to ensure the tight assembly of the inner labyrinth ring. By setting the first assembly interference of the inner labyrinth ring 1 in the driven gear labyrinth ring seat, under this first assembly interference state, the inner labyrinth ring 1 can be guaranteed not to have radial movement, and the labyrinth size change of the inner labyrinth ring 1 can be guaranteed not to be greater than 0.05mm.

[0032] Optionally, after removing the pressure fixture, the axial clearance between the inner labyrinth ring 1 and the driven gear labyrinth ring seat is checked using a feeler gauge, ensuring that a 0.02mm feeler gauge cannot be inserted.

[0033] Specifically, the axial clearance between the inner labyrinth ring 1 and the driven gear labyrinth ring seat is measured with a feeler gauge to ensure that the axial clearance is less than 0.02mm, ensuring that the inner labyrinth ring 1 is accurately installed after heat fitting, thereby ensuring that the labyrinth clearance is sufficient and stable.

[0034] In this embodiment, the pressurizing fixture includes a cylindrical component that avoids obstruction through its inner hole and presses one end face against the end face of the inner labyrinth ring 1 to pressurize the inner labyrinth ring 1; furthermore, it can also be used in conjunction with a pressurizing device to regulate the holding pressure through the pressing action of the pressurizing device.

[0035] Optionally, detecting the shape and size of the labyrinth section of the bearing housing 3 includes: Insert the annular detection fixture into the annular groove of the labyrinth part of the bearing box 3, and ensure that the annular detection fixture can rotate smoothly. The smoothly rotating annular detection fixture is placed against the inner wall of the annular groove in different directions. The gap between the opposite side of the annular detection fixture and the inner wall of the annular groove is measured by a feeler gauge, and the gap is ensured to be no less than the set gap value.

[0036] Specifically, the axle clamp 3 has a complex structure, and its runout is difficult to measure in the labyrinth section. An annular detection fixture is provided to detect the labyrinth section of the axle clamp 3. The annular detection fixture includes at least one detection ring, the size of which matches the design size of the labyrinth section of the axle clamp 3, and can be inserted into the annular groove of the labyrinth section of the axle clamp 3. The detection method is as follows: if the detection ring is stuck after insertion, the axle clamp 3 is replaced or repaired. If it rotates freely, the annular detection fixture is placed against the groove wall in different directions of the annular groove, such as up, down, left, and right. Then, a feeler gauge is used to detect the gap between the detection ring and the groove wall of the annular groove on the opposite side.

[0037] Optionally, the gap setting is 0.5mm.

[0038] Specifically, by setting the gap setting value, the size and runout of the annular groove are ensured to meet the usage requirements, thereby ensuring that the size gap between the labyrinth part of the axle box 3 and the inner labyrinth ring 1 meets the requirements after the axle box 3 is assembled.

[0039] Optionally, it also includes: Before assembling the outer labyrinth ring 8, its inner diameter is measured and machined to ensure that the second assembly interference of its inner diameter after machining is 0.05-0.07 mm.

[0040] Specifically, for the assembly process improvement of the outer labyrinth ring 8 of the driven gear 2 with the sealing ring 6 and labyrinth cover 7, since the outer labyrinth ring 8 is assembled at the labyrinth ring seat of the axle 4 by heat fitting, the temperature will have a certain impact on its size. Based on the discovery that the diameter of the heated outer labyrinth ring 8 increases by about 0.1 mm after returning to room temperature, the inner diameter of the outer labyrinth ring 8 is measured and processed. By limiting the second assembly interference size of its inner diameter, the deformation after assembly is ensured to meet the requirements.

[0041] Optionally, it also includes: After assembling the outer labyrinth ring 8, measure the distance between the end face of the outer labyrinth ring 8 and the end face of the wheel seat of the axle 4, and ensure that the distance is 239.4-239.6mm.

[0042] Specifically, in order to ensure that the outer labyrinth ring 8 is properly assembled after being assembled onto the axle 4, a corresponding process method is added. After the outer labyrinth ring 8 is assembled, the distance between the end face of the outer labyrinth ring 8 and the end face of the wheel seat of the axle 4 is measured. By setting a specific distance range, the installation of the outer labyrinth ring 8 is ensured to be accurate.

[0043] Furthermore, with HX D Taking the assembly of the drive unit of a Type 3 electric locomotive as an example, such as Figure 2 As shown, the outer labyrinth ring 8 is assembled to the labyrinth ring seat of axle 4 by heat fitting. The outer labyrinth ring 8 and the labyrinth ring seat of axle 4 are interference fit, with the original interference setting being 0.029~0.093mm. During normal locomotive operation, it moves in a circular motion with axle 4. The sealing ring 6 is connected to the labyrinth cover 7 by M6×25 screws. The labyrinth cover 7 is connected to the gearbox 9 by M12×30 bolts. By adjusting the three adjusting screws connecting the gearbox 9 and the motor, the gap between the labyrinth ring and the labyrinth cover 7 is ensured to be uniform. A 0.35mm feeler gauge is required to pass the test, and a 0.70mm feeler gauge cannot be inserted. HX DWhen the outer labyrinth ring 8 of the Type 3 electric locomotive detaches axially towards the wheel side, there are wear marks between the outer labyrinth ring 8 and the labyrinth cover 7, and between the outer labyrinth ring 8 and the sealing ring 6. The wear marks at the labyrinth of the outer labyrinth ring 8 show signs of metal adhesion and metal turning black or blue due to heat, and there is metal accumulation on the end face of the labyrinth ring. At the same time, there are signs of creeping relative to the axle 4 at the inner hole of the outer labyrinth ring 8, and the inner hole of the outer labyrinth ring 8 also shows signs of high temperature blueing. There are also crushing marks at the labyrinth ring seat of the axle 4, and the wear marks at the wear mark of the sealing ring 6 are also present. This invention first calculates the theoretical clearance of one side of the labyrinth between the outer labyrinth ring 8 and the sealing ring 6 and the labyrinth of the labyrinth cover 7 according to the design dimensions. Then, it measures the inner distance of the wheelset, compares the changes in the inner distance of the heavy-load wheelset, analyzes the cause of the wear accident, and then uses the above-mentioned assembly method of the drive device for reducing wear based on the Harmony type electric locomotive to optimize the process, ensure the labyrinth clearance, and reduce the probability of wear.

[0044] Optionally, it also includes: Before assembling the sealing ring 6, the dimensions of the sealing ring 6 are measured to avoid original machining deviations.

[0045] Specifically, for the case of wear between the sealing ring 6 and the outer end face of the hub hole of the driven gear 2, process improvements are made during the assembly process. Through analysis of this wear situation, the relevant dimensions of each component of the gearbox 9 assembly are measured, especially the dimensions of the sealing ring 6. This may also include the axial dimension measurement of the labyrinth cover 7 and the outer labyrinth ring 8. The sealing ring 6 with original machining deviations is repaired.

[0046] Furthermore, with HX D Taking the assembly of the drive unit of a Type 3 electric locomotive as an example, such as Figure 3As shown, when the sealing ring 6 rubs against the outer end face of the hub hole of the driven gear 2, the axle 4 cannot rotate after the drive unit is assembled. There are varying degrees of shiny rubbing marks on the outer end face of the hub hole of the driven gear 2 and the surrounding spoke surfaces. Some of these marks are noticeably worn to the touch. Simultaneously, rubbing marks are also present on the corresponding part of the sealing ring 6. Based on the rubbing marks on the spoke surfaces and hub hole end face of the driven gear 2, the rubbing situation is that the inner side of the sealing ring 6 rubs against the outer end face of the hub hole of the driven gear 2 and the surrounding spoke surfaces. Abnormal friction caused by mutual interference; based on the design dimensions and calculation analysis, the radial centerline of the driven gear 2 is taken as the standard, the sides closer to the centerline are the inner sides, and the sides farther from the centerline are the outer sides. Taking the outer end face of the outer ring of the tooth-side bearing 5 as the reference, after the tooth-side bearing 5 is assembled, its outer end face is completely in close contact with the outer end face of the bearing housing 3, and the inner end face of the inner ring of the bearing 5 is completely in close contact with the inner end face of the hub hole of the driven gear 2. Therefore, the distance from the outer end face of the hub hole of the driven gear 2 to the outer ring of the bearing 5 can be calculated. The gearbox 9 is assembled with the axle housing 3 via bolts. The outer mounting surface of the axle housing 3 and the inner mounting surface of the large collar of the gearbox 9 are completely flush after assembly. At the same time, the inner side of the labyrinth cover 7 is also assembled with the outer mounting surface of the middle collar of the gearbox 9 via bolts. After assembly, the two mounting surfaces are completely flush. The sealing ring 6 is also tightly assembled with the inner side of the labyrinth cover 7. Therefore, the distance between the inner side of the sealing ring 6 and the outer end face of the bearing seat of the axle housing 3 (the outer end face of the outer ring of the bearing 5) can be calculated. Then, the distance between the outer end face of the hub hole of the driven gear 2 and the inner side of the sealing ring 6 can be calculated, as well as the movement clearance between the sealing ring 6 and the driven gear 2 after the gearbox 9 is assembled. Then, the above-mentioned assembly method of the drive device based on the Harmony Electric Locomotive to reduce friction is used to optimize the process. The sealing ring 6 with machining deviation is repaired and inspected. After reassembly, the axle 4 is manually rotated. It rotates flexibly, the friction noise is eliminated, and the assembly of the gearbox 9 meets the requirements to reduce the probability of friction.

[0047] In summary, the present invention provides an assembly method for a drive device that reduces friction on a Harmony-type electric locomotive: 1. By measuring the runout of the driven gear labyrinth ring seat, it is determined that its circumferential runout is ≤0.02mm and its end face runout is ≤0.02mm. This ensures that the dimensions of the inner labyrinth ring 1 after assembly meet the labyrinth clearance requirements and avoids grinding accidents.

[0048] 2. By setting the first assembly interference of the inner labyrinth ring 1 and the driven gear labyrinth ring seat to 0.07-0.1mm, it can be ensured that the dimensions of the inner labyrinth ring 1 after assembly meet the labyrinth clearance requirements, thus avoiding the occurrence of grinding accidents.

[0049] 3. Establish an assembly process for the inner labyrinth ring: When assembling the heated inner labyrinth ring 1, rotate the labyrinth ring 1-2 turns to ensure it is axially and tightly fitted with the driven gear labyrinth ring seat. Then, use a special tooling pressure iron to maintain pressure. After it returns to room temperature, remove the pressure iron and use a feeler gauge to check the gap between the labyrinth ring and the driven gear labyrinth ring seat. A 0.02mm feeler gauge should not be inserted. By establishing a process, ensure that the dimensions of the assembled inner labyrinth ring 1 meet the labyrinth gap requirements and avoid grinding accidents.

[0050] 4. By formulating corresponding measures, after assembling the inner labyrinth ring 1 with the axle 4, the circumferential runout of the labyrinth ring is measured to be ≤0.06mm. This ensures that the dimensions of the inner labyrinth ring 1 after assembly meet the labyrinth clearance requirements and avoids grinding accidents.

[0051] 5. By developing a method for detecting the labyrinth clearance of the bearing housing 3, and using special tooling to detect the four-point clearance of the labyrinth part, the clearance of the four points should all be ≥0.5mm. This can ensure that the labyrinth size of the bearing housing 3 meets the labyrinth clearance requirements and avoid grinding accidents.

[0052] 6. By setting the second assembly interference of the inner diameter of the outer labyrinth ring 8 to 0.05-0.07 mm, it can be ensured that the labyrinth clearance requirement is still met after the outer labyrinth ring 8 is heated and assembled, thus avoiding the occurrence of grinding accidents.

[0053] 7. After assembling the outer labyrinth ring 8 and axle 4, measure the distance between the end face of the outer labyrinth ring 8 and the end face of the wheel seat of axle 4, ensuring that this distance is 239.4-239.6mm. This ensures that the labyrinth clearance requirement is still met after the outer labyrinth is heat-installed, avoiding grinding accidents.

[0054] 8. By measuring the relevant dimensions of each component in the gearbox 9 assembly, especially the relevant dimensions of the sealing ring 6, and repairing the sealing ring 6 with original machining deviations, the clearance requirements between the sealing ring 6 and the driven gear 2 can be guaranteed, thus avoiding friction accidents.

[0055] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for assembling a drive device to reduce friction in a Harmony-type electric locomotive, characterized in that, include: Before assembling the inner labyrinth ring, the runout of the driven gear labyrinth ring seat is measured, and its circumferential runout and end face runout are respectively less than the first runout setting value and the second runout setting value. Before the heat treatment of the inner labyrinth ring and the driven gear labyrinth ring seat, the outer diameter of the inner labyrinth ring is measured to obtain the first outer diameter measurement value. During the heat fitting process of the inner labyrinth ring and the driven gear labyrinth ring seat, the inner labyrinth ring is rotated to make it axially close to the driven gear labyrinth ring seat, and then pressure is maintained by a pressure fixture until the room temperature is restored and the pressure fixture is removed. After the inner labyrinth ring and the driven gear labyrinth ring seat are heated for hot fitting, the outer diameter of the inner labyrinth ring is measured to obtain the second outer diameter measurement value, and the first assembly interference is determined based on the first outer diameter measurement value and the second outer diameter measurement value. After the inner labyrinth ring and the driven gear labyrinth ring seat are heated for thermal assembly, the runout of the inner labyrinth ring is measured, and its circumferential runout is made less than the third runout setting value. Before assembling the axle box, inspect the shape and size of the labyrinth section of the axle box.

2. The assembly method of the drive device for reducing friction on a Harmony-type electric locomotive according to claim 1, characterized in that, The axle equipped with the driven gear is placed on a lathe, and the runout of the labyrinth ring seat of the driven gear is measured.

3. The assembly method of the drive device for reducing friction on a Harmony-type electric locomotive according to claim 1, characterized in that, The first and second runout settings are both 0.02 mm.

4. The assembly method of the drive device for reducing friction on a Harmony-type electric locomotive according to claim 1, characterized in that, The first assembly interference is 0.07-0.1mm.

5. The assembly method of the drive device for reducing friction on a Harmony-type electric locomotive according to claim 1, characterized in that, After removing the pressure fixture, the process also includes using a feeler gauge to check the axial clearance between the inner labyrinth ring and the driven gear labyrinth ring seat, ensuring that a 0.02mm feeler gauge cannot be inserted.

6. The assembly method of the drive device for reducing friction on a Harmony-type electric locomotive according to claim 1, characterized in that, The inspection of the shape and size of the labyrinth section of the bearing housing includes: Insert the annular detection fixture into the annular groove of the labyrinth part of the bearing box, and ensure that the annular detection fixture can rotate smoothly. The smoothly rotating annular detection fixture is placed against the inner wall of the annular groove in different directions. The gap between the opposite side of the annular detection fixture and the inner wall of the annular groove is measured by a feeler gauge, and the gap is ensured to be no less than the set gap value.

7. The assembly method of the drive device for reducing friction on a Harmony-type electric locomotive according to claim 6, characterized in that, The gap setting value is 0.5mm.

8. The assembly method of the drive device for reducing friction on a Harmony-type electric locomotive according to claim 1, characterized in that, Also includes: Before assembling the outer labyrinth ring, its inner diameter is measured and machined to ensure that the second assembly interference of its inner diameter after machining is 0.05-0.07mm.

9. The assembly method of the drive device for reducing friction on a Harmony-type electric locomotive according to claim 1, characterized in that, Also includes: After assembling the outer labyrinth ring, measure the distance between the end face of the outer labyrinth ring and the end face of the axle wheel seat, and ensure that the distance is 239.4-239.6mm.

10. The assembly method of the drive device for reducing friction on a Harmony-type electric locomotive according to claim 1, characterized in that, Also includes: Before assembling the sealing ring, the dimensions of the sealing ring are measured to avoid original machining deviations.

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