High-temperature-resistant bearing sleeve heat treatment device for automobile generator

Abstract

A kind of high-temperature-resistant bearing sleeve heat treatment device of automobile generator, the inside of working cylinder body is equipped with horizontally arranged partition, partition separates the inner cavity of working cylinder body into upper chamber and lower chamber, protection cylinder is equipped in upper chamber, protection cylinder is located above partition, heater is equipped in lower chamber, the working end of heater is connected with conducting pipe, conducting pipe penetrates partition and extends into heat storage tank inside upwards, filter screen is equipped in conducting pipe, vertical limiting post is equipped in through-hole, limiting post lower end is fixed on the top surface of partition, its outer wall is equipped with bearing body, the lower part of the outer wall of bearing body is equipped with limiting sleeve ring.The heat enters heat storage tank after passing through conducting pipe wall in the utility model, so that the whole annular cavity tends to thermal equilibrium state, follows steady-state heat conduction equation under cylindrical coordinate system, temperature only changes along radial direction, there is no gradient in circumferential direction, multiple rows of circumferentially uniformly distributed heat dissipation holes are arranged on cylinder wall, so that heat is released to inner cavity in the form of point source radiation+forced convection.

Description

Technical Field

[0001] This utility model belongs to the technical field, specifically a heat treatment device for high-temperature resistant bearing sleeves of automotive generators. Background Technology

[0002] In automotive generators, high-temperature bearing sleeves are key components supporting the high-speed rotation of the rotor, operating under conditions of high temperature, high speed, and vibration for extended periods. To ensure their strength, wear resistance, and service life, these bearing sleeves require rigorous heat treatment processes, such as quenching and tempering, to achieve a uniform and dense internal structure and stable dimensional accuracy.

[0003] Currently, the most commonly used heat treatment equipment in the industry consists of box furnaces, pit furnaces, or simple electric drying ovens. While these devices are simple in structure and low in cost, several technical problems have been exposed in practical applications: First, traditional equipment usually arranges heating elements on one side or at the bottom of the furnace body, and heat is introduced from one direction, resulting in uneven temperature distribution inside the furnace. The bearing sleeves closer to the heat source heat up quickly, while those farther away from the heat source heat up slowly. The temperature difference between different positions of the workpiece in the same batch can reach more than ten or even twenty degrees Celsius. The temperature difference will cause inconsistent internal structural transformation of the bearing sleeve - some areas have high hardness but are brittle, while other areas have insufficient hardness, which seriously affects product performance and life. Secondly, at high temperatures, the surface of the bearing sleeve will oxidize and peel off to form oxide scale. Residual oil and metal shavings from processing will also carbonize and peel off. Traditional equipment does not have a special impurity collection or filtration device, so particulate matter will float around in the furnace. It will not only adhere to the surface of other workpieces, causing indentations, spots or local decarburization, but also block the heating channel or deposit on the heating element, affecting the heat dissipation and service life of the equipment. Third, most existing equipment simply stacks bearing sleeves haphazardly on trays or supports, lacking effective centering and limiting structures. During the heating process, workpieces are prone to shifting, tilting, or even colliding with each other due to thermal expansion, airflow disturbances, or vibrations, resulting in uneven heating or surface damage.

[0004] To address this issue, a heat treatment device for high-temperature resistant bearing sleeves in automotive generators is provided. Utility Model Content

[0005] In view of the above situation and to overcome the defects of the prior art, this utility model provides a heat treatment device for high temperature resistant bearing sleeves of automobile generators, so as to at least partially solve the above technical problems.

[0006] The technical solution adopted by this utility model is as follows: This utility model proposes a heat treatment device for high-temperature resistant bearing sleeves of automotive generators, comprising: The working cylinder has a horizontally arranged partition plate inside, which divides the inner cavity of the working cylinder into an upper chamber and a lower chamber. The upper chamber is provided with a protective cylinder, which is located above the partition plate. The protective cylinder has a through hole in its center along the axial direction, and an annular heat storage tank is formed inside its cylinder wall. A heater is provided in the lower chamber, and the working end of the heater is connected to a conduction pipe. The conduction pipe passes through the partition plate upward and extends into the heat storage tank. A filter screen is provided inside the conduction pipe. A vertically arranged limiting post is provided in the through hole. The lower end of the limiting post is fixed to the top surface of the partition plate. A bearing body is sleeved on its outer wall. A limiting collar is sleeved on the lower part of the outer wall of the bearing body. The top surface of the partition plate is equipped with an electric lifter, and the working end of the electric lifter is equipped with a lifting rod. The upper end of the lifting rod is fixedly connected to the outer wall of the limiting collar.

[0007] As a further embodiment of this utility model: a filter hole is provided in the central area of ​​the partition plate, the filter hole is located directly below the protective cylinder, and a miscellaneous storage frame is provided on the bottom surface of the partition plate, the miscellaneous storage frame opening upward and facing the filter hole.

[0008] As a further improvement of this utility model: the top surface of the partition plate is also provided with an L-shaped support rod, one end of which is fixed to the top surface of the partition plate by bolts, and the other end is welded or screwed to the upper part of the outer wall of the protective cylinder.

[0009] As a further improvement of this utility model: the protective cylinder is a cylindrical structure with an annular gap between its outer wall and the inner wall of the working cylinder; the cylinder wall of the protective cylinder is provided with several sets of heat dissipation holes, which are evenly distributed along the circumference of the protective cylinder and arranged in multiple rows along the axial direction.

[0010] As a further embodiment of this utility model: the top surface of the working cylinder is provided with a cover plate, the cover plate is detachably fixed to the top flange of the working cylinder by circumferentially distributed fastening screws, and the center of the cover plate is provided with a mounting hole, the inner diameter of the mounting hole matching the outer diameter of the bearing body.

[0011] As a further improvement of this utility model: the outer wall of the working cylinder is provided with a fixed leg, the bottom surface of the fixed leg is provided with an anti-slip pad, and the bottom surface of the anti-slip pad is provided with anti-slip texture.

[0012] As a further improvement of this utility model: the top surface of the cover plate is provided with a control panel, which is electrically connected to the heater and the electric lifter respectively through conductive lines.

[0013] Implementing the embodiments of this utility model will have the following beneficial effects: In this embodiment, after the heat enters the heat storage tank through the conduction pipe wall, it diffuses rapidly in the high heat capacity medium, causing the entire annular cavity to tend to a thermal equilibrium state. Since the heat storage tank surrounds the protective cylinder, the temperature distribution on its inner wall is highly symmetrical. When the heat is conducted inward through the cylinder wall, it follows the steady-state heat conduction equation in the cylindrical coordinate system. The temperature only changes radially and there is no gradient in the circumferential direction. The multiple rows of circumferentially evenly distributed heat dissipation holes opened on the cylinder wall allow the heat to be released into the inner cavity in the form of point source radiation + forced convection. This embodiment employs a dual purification mechanism: an internal filter screen within the conduction tube and a filter hole + impurity storage frame in the center of the partition plate. The filter screen, based on the principle of porous media filtration, uses its pore structure to intercept solid particles (such as metal oxides and carbide debris) carried in the heat storage medium, preventing them from entering the heat storage tank and causing deposition or blockage. Impurities that detach from the bearing surface, under the influence of gravity and thermal buoyancy, settle to the bottom along the inner wall of the protective cylinder and fall through the filter hole located directly below into the impurity storage frame, thus improving the cleanliness of the heat treatment environment. In this embodiment, the bearing body is sleeved on the limiting post, with its inner diameter and the outer diameter of the limiting post forming a clearance fit. Under the action of gravity, it naturally centers itself, achieving automatic centering. The limiting collar supports the bottom of the bearing and is connected to an electric lifter via a lifting rod, forming an active height adjustment mechanism. During different stages of heat treatment (heating, heat preservation, and cooling preparation), the bearing position is adjusted by controlling the electric lifter—for example, in the early stage of heating, it is placed at the edge of the hot zone to slow down the heating rate and avoid thermal shock; in the heat preservation stage, it is moved to the core area of ​​the hot zone to ensure temperature uniformity.

[0014] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is an exploded view of the components of the high-temperature bearing sleeve heat treatment device for automobile generators proposed in this embodiment of the utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the heat treatment device for the high-temperature bearing sleeve of the automobile generator proposed in this embodiment of the utility model.

[0018] Figure 3 This is a top view of the heat treatment device for high-temperature bearing sleeves of an automotive generator according to an embodiment of this utility model.

[0019] Figure 4 This is a front view of the heat treatment device for high-temperature bearing sleeves of automotive generators proposed in an embodiment of this utility model.

[0020] Figure 5 for Figure 3 A cross-sectional view along the cutting line AA.

[0021] Figure 6 for Figure 4 A cross-sectional view along the cutting line BB.

[0022] Figure 7 for Figure 4 A cross-sectional view along the section line CC.

[0023] In the diagram: 1. Working cylinder; 2. Divider plate; 3. Protective cylinder; 4. Heater; 5. Conducting pipe; 6. Heat storage tank; 7. Heat dissipation hole; 8. L-shaped support rod; 9. Filter screen; 10. Impurity storage frame; 11. Electric lifter; 12. Lifting rod; 13. Limiting collar; 14. Limiting post; 15. Bearing body; 16. Cover plate; 17. Mounting hole; 18. Fixing leg; 19. Anti-slip pad; 20. Control panel; 21. Filter hole.

[0024] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof. Detailed Implementation

[0025] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0026] It is important to note that the terms "first," "second," etc., are used only to distinguish between descriptive and positional descriptions, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified with "first," etc., may explicitly or implicitly include one or more of that feature; similarly, when the quantity of certain features is not limited by words such as "two" or "three," it should be noted that such features also explicitly or implicitly include one or more features. In the embodiments of this utility model, unless otherwise explicitly specified and limited, terms such as "installation," "connection," and "fixation" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, a direct connection, a welding connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the accompanying drawings and specific circumstances.

[0027] In the description of the embodiments of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0028] like Figures 1 to 7 As shown, a heat treatment device for high-temperature bearing sleeves of automobile generators includes: a working cylinder 1, which has a horizontally arranged partition plate 2 inside, which divides the inner cavity of the working cylinder 1 into an upper chamber and a lower chamber. The upper chamber is equipped with a protective cylinder 3, which is located above the partition plate 2. A through hole is opened in the center along the axial direction, and an annular heat storage tank 6 is opened in the inner wall of the cylinder. The lower chamber is equipped with a heater 4, and the working end of the heater 4 is connected to a conduction pipe 5. The conduction pipe 5 passes through the partition plate 2 and extends into the heat storage tank 6. A filter screen 9 is provided inside the conduction pipe 5. A vertically arranged limiting post 14 is provided in the through hole. The lower end of the limiting post 14 is fixed to the top surface of the partition plate 2. A bearing body 15 is sleeved on its outer wall. A limiting collar 13 is sleeved on the lower part of the outer wall of the bearing body 15. An electric lifter 11 is provided on the top surface of the partition plate 2. A lifting rod 12 is provided at the working end of the electric lifter 11. The upper end of the lifting rod 12 is fixedly connected to the outer wall of the limiting collar 13.

[0029] In a specific application of this utility model embodiment, before starting the equipment, the operator places the bearing body 15 to be processed onto the limiting post 14 located in the central through hole of the protective cylinder 3. The limiting post 14 is vertically fixed to the top surface of the partition plate 2, and its outer diameter is slightly smaller than the inner diameter of the bearing, ensuring that the bearing can smoothly slide to the predetermined position while restricting its free sway in the radial direction. At this time, the bearing body 15 naturally falls to its bottom and contacts the limiting collar 13, which is connected to the electric lift 11 below through the lifting rod 12 connected to the outer wall. In the initial state, the electric lift 11 is in the retracted state, so that the limiting collar 13 supports the bearing body 15 and stably supports it in the preset height area inside the protective cylinder 3, ensuring that it is completely within the effective range of the subsequent thermal field.

[0030] Subsequently, the heater 4 in the lower chamber begins operation, generating high-temperature heat energy. This heat energy is not directly radiated or convectioned to the bearing surface, but rather transported upwards through the conduction pipe 5 using a medium (such as high-temperature heat transfer oil, molten salt vapor, or inert gas) as a carrier to the annular heat storage tank 6 inside the protective cylinder 3. This physically isolates the heat source from the workpiece, preventing localized overheating, accelerated oxidation, or sudden temperature changes caused by direct heating from open flames or electric heating elements. Simultaneously, the filter screen 9 inside the conduction pipe 5 effectively intercepts metal debris, oxide scale, or impurity particles carried in the heat medium, preventing them from entering the heat storage tank 6 and causing blockages or contamination of the thermal field, ensuring the long-term unobstructed and cleanliness of the heat conduction path.

[0031] When the high-temperature medium is continuously injected into the heat storage tank 6, the heat storage tank 6, as an annular heat capacity cavity, rapidly heats up and tends to a thermal equilibrium state. Since the heat storage tank 6 surrounds the protective cylinder 3, its heat is evenly distributed through the cylinder wall by heat conduction, and further released into the inner cavity of the protective cylinder 3 by a combination of radiation and forced convection through multiple sets of heat dissipation holes 7 densely opened on the cylinder wall.

[0032] Throughout the heat treatment process, the bearing body 15 is always constrained to the axial center position by the limiting post 14, while its height can be dynamically adjusted by the electric lifter 11. For example, during the heating stage, the bearing can be slightly raised to avoid the area with the most severe initial thermal shock; during the heat preservation stage, it can be lowered to the core area with the most uniform thermal field; and during the cooling preparation stage, it can be raised in advance for quick removal.

[0033] In one embodiment, a filter hole 21 is provided in the central area of ​​the partition plate 2. The filter hole 21 is located directly below the protective cylinder 3. A storage frame 10 is provided on the bottom surface of the partition plate 2. The storage frame 10 opens upward and faces the filter hole 21. An L-shaped support rod 8 is also provided on the top surface of the partition plate 2. One end of the L-shaped support rod 8 is fixed to the top surface of the partition plate 2 by bolts, and the other end is welded or screwed to the upper middle part of the outer wall of the protective cylinder 3.

[0034] The protective cylinder 3 is a cylindrical structure with an annular gap between its outer wall and the inner wall of the working cylinder 1. The cylinder wall of the protective cylinder 3 is provided with several sets of heat dissipation holes 7, which are evenly distributed around the circumference of the protective cylinder 3 and arranged in multiple rows along the axial direction.

[0035] In a specific application of this utility model embodiment, when the heater 4 is started and the high-temperature heat medium is introduced into the heat storage tank 6 inside the protective cylinder 3 through the conduction pipe 5, the heat continues to radiate inward through the cylinder wall and is released into the internal space of the protective cylinder 3 through the densely distributed multi-row heat dissipation holes 7. During this process, the surface of the bearing body 15 is heated and produces tiny oxide scale, carbonized particles, or metal fragments due to high-temperature oxidation or original processing residues. The impurities fall off naturally under the disturbance of hot airflow or gravity and settle downward along the inner wall of the protective cylinder 3. Since the bottom of the protective cylinder 3 is an open structure and is directly opposite the filter hole 21 opened in the central area of ​​the partition plate 2, the fallen impurities can smoothly pass through the filter hole 21 and fall into the impurity storage frame 10 set below. The impurity storage frame 10 adopts an upward-opening box-shaped structure and is fixed to the bottom surface of the partition plate 2 to ensure that the impurities are effectively collected and do not flow back to the upper chamber.

[0036] Meanwhile, although the protective cylinder 3 itself is made of high-temperature resistant alloy, it still undergoes thermal expansion deformation or slight displacement due to vibration under prolonged high-temperature conditions. To mitigate such risks, an L-shaped support rod 8 is added to the top surface of the partition plate 2. One end of the rod is rigidly fixed to the partition plate 2, and the other end is firmly connected to the upper middle area of ​​the outer wall of the protective cylinder 3. From a mechanical perspective, the support structure forms a triangular stable support system, effectively constraining the radial and axial degrees of freedom of the protective cylinder 3 and preventing it from tilting, swaying, or even interfering with the limiting column 14 due to uneven thermal stress or external disturbances. Especially when the equipment is frequently started and stopped or the lifting mechanism is activated, the L-shaped support rod 8 can absorb part of the dynamic load and maintain the constant spatial posture of the protective cylinder 3, thereby ensuring that the distribution orientation of the heat dissipation holes 7 and the symmetry of the thermal field are always maintained, avoiding local heat flux density imbalance caused by cylinder displacement.

[0037] Furthermore, the annular gap between the outer wall of the protective cylinder 3 and the inner wall of the working cylinder 1 not only provides necessary buffer space for thermal expansion, preventing structural jamming or stress concentration at high temperatures, but also forms a natural convection channel. Some of the hot air escaping from the heat dissipation holes 7 can flow upward along this gap and then be discharged through the gap in the top cover plate 16 or a dedicated exhaust port, forming a weak but continuous airflow circulation, which helps to remove moisture or volatile impurities from the cavity and further optimize the heat treatment atmosphere. The heat dissipation holes 7 themselves are evenly arranged circumferentially and arranged in multiple rows axially. After the heat is conducted from the heat storage tank 6 through the cylinder wall to each heat dissipation hole 7, it radiates inward in the form of point sources. After multiple point sources are superimposed, an approximately ideal cylindrical symmetrical thermal field is formed in the central area of ​​the protective cylinder 3.

[0038] In one embodiment, the top surface of the working cylinder 1 is provided with a cover plate 16. The cover plate 16 is detachably fixed to the top flange of the working cylinder 1 by circumferentially distributed fastening screws. The center of the cover plate 16 is provided with a mounting hole 17. The inner diameter of the mounting hole 17 matches the outer diameter of the bearing body 15. The outer wall of the working cylinder 1 is provided with a fixing leg 18. The bottom surface of the fixing leg 18 is provided with an anti-slip pad 19. The bottom surface of the anti-slip pad 19 is provided with anti-slip texture.

[0039] In a specific application of this utility model embodiment, before the equipment starts operating, the operator places the bearing body 15 to be processed into the limiting post 14 and lifts it to the predetermined heat treatment position inside the protective cylinder 3 by the lifting mechanism. Subsequently, the cover plate 16 is securely installed on the top flange of the working cylinder 1 using circumferentially distributed fastening screws. The cover plate 16 is not a simple cover; the inner diameter of the mounting hole 17 in its center matches the outer diameter of the bearing body 15, with only a small gap (usually 0.1–0.3 mm) between them. This allows the inner wall of the mounting hole 17 to form a ring constraint on the upper part of the bearing body 15 when the cover plate 16 is closed, effectively limiting its radial sway caused by hot air flow disturbance or slight vibration during the heat treatment process.

[0040] Meanwhile, the tight connection between the cover plate 16 and the top flange of the working cylinder 1, together with the existing sealing gasket (such as high-temperature resistant silicone or ceramic fiber gasket), physically seals the upper chamber, reduces heat loss through the top opening, and maintains the stability of the atmosphere inside the chamber—whether it is a natural air environment or a subsequently expandable protective gas atmosphere, it can prevent temperature fluctuations or accelerated oxidation caused by the continuous intrusion of external cold air.

[0041] At the bottom of the equipment, the bottom ends of the fixed legs 18 on the outer wall of the working cylinder 1 are all fixedly installed with anti-slip pads 19. The anti-slip pads 19 are made of high-density rubber, polyurethane, or composite elastomer materials, and have excellent compressive resilience and temperature resistance. The anti-slip texture on the bottom surface of the anti-slip pads 19 can increase the static friction coefficient with the ground (such as concrete floor, steel plate platform, or vibration damping base) under the tendency of slight vibration caused by thermal expansion, internal airflow disturbance, or lifting mechanism operation during equipment operation.

[0042] In one possible implementation, the top surface of the cover plate 16 is provided with a control panel 20, which is electrically connected to the heater 4 and the electric lift 11 via conductive wires.

[0043] In the specific application of this utility model embodiment, the heater 4 and electric lift 11 used in this device are both mature existing technologies, and the working principles of the heater 4 and electric lift 11 are well known to those skilled in the art, so they will not be described in detail here.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0046] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A heat treatment device for high-temperature resistant bearing sleeves of automotive generators, characterized in that, include: The working cylinder (1) has a horizontally arranged partition plate (2) inside, which divides the inner cavity of the working cylinder (1) into an upper chamber and a lower chamber; The upper chamber is provided with a protective cylinder (3), which is located above the partition plate (2). A through hole is provided in the center along the axial direction, and an annular heat storage tank (6) is provided in the inner wall of the cylinder. The lower chamber is equipped with a heater (4), and the working end of the heater (4) is connected to a conduction pipe (5). The conduction pipe (5) extends upward through the partition plate (2) and into the heat storage tank (6). A filter screen (9) is provided inside the conduction pipe (5). The through hole is provided with a vertically arranged limiting post (14), the lower end of the limiting post (14) is fixed to the top surface of the partition plate (2), and a bearing body (15) is sleeved on its outer wall. A limiting collar (13) is sleeved on the lower part of the outer wall of the bearing body (15). The top surface of the partition plate (2) is provided with an electric lifter (11), and the working end of the electric lifter (11) is provided with a lifting rod (12). The upper end of the lifting rod (12) is fixedly connected to the outer wall of the limiting collar (13).

2. The heat treatment device for high-temperature bearing sleeves of automotive generators according to claim 1, characterized in that, The partition plate (2) has a filter hole (21) in the center area. The filter hole (21) is located directly below the protective cylinder (3). The bottom surface of the partition plate (2) is provided with a storage frame (10). The storage frame (10) opens upward and faces the filter hole (21).

3. The heat treatment device for high-temperature bearing sleeves of automotive generators according to claim 1, characterized in that, The top surface of the partition plate (2) is also provided with an L-shaped support rod (8). One end of the L-shaped support rod (8) is fixed to the top surface of the partition plate (2) by bolts, and the other end is welded or screwed to the upper part of the outer wall of the protective cylinder (3).

4. The heat treatment device for high-temperature bearing sleeves of automotive generators according to claim 1, characterized in that, The protective cylinder (3) is a cylindrical structure with an annular gap between its outer wall and the inner wall of the working cylinder (1); the protective cylinder (3) has several sets of heat dissipation holes (7) on its cylinder wall, which are evenly distributed around the protective cylinder (3) and arranged in multiple rows along the axial direction.

5. The heat treatment device for high-temperature bearing sleeves of automotive generators according to claim 1, characterized in that, The top surface of the working cylinder (1) is provided with a cover plate (16). The cover plate (16) is detachably fixed to the top flange of the working cylinder (1) by circumferentially distributed fastening screws. The center of the cover plate (16) is provided with a mounting hole (17). The inner diameter of the mounting hole (17) matches the outer diameter of the bearing body (15).

6. The heat treatment device for high-temperature bearing sleeves of automotive generators according to claim 1, characterized in that, The outer wall of the working cylinder (1) is provided with a fixed leg (18), and the bottom surface of the fixed leg (18) is provided with an anti-slip pad (19), and the bottom surface of the anti-slip pad (19) is provided with anti-slip texture.

7. The heat treatment device for high-temperature bearing sleeves of automotive generators according to claim 5, characterized in that, The top surface of the cover plate (16) is provided with a control panel (20), which is electrically connected to the heater (4) and the electric lifter (11) via conductive wires.

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