A rear fan structure of an automobile generator

Abstract

This utility model discloses a rear fan structure for an automotive alternator, including an alternator body and a rear fan. A quick-connect mechanism is provided between the alternator body and the rear fan. The quick-connect mechanism includes a plug rod, a fixing sleeve, a slider, a clamping plate, a slot, an abutment block, a sliding sleeve, and an unlocking mechanism. The plug rod is fixed to the outer wall of the alternator body and plugged into the rear fan. The fixing sleeve is plugged into the top of the plug rod. Multiple sliders slide on the outer wall of the fixing sleeve. The clamping plate is fixed to the bottom of multiple sliders. The slot is located on the outer wall of the plug rod. The abutment block is fixed to the top of multiple sliders. The sliding sleeve slides on the outer wall of the fixing sleeve. The unlocking mechanism includes a mating sleeve, a rotating sleeve, a threaded sleeve, a sliding hole, a compression spring, and a top block. The quick-connect mechanism adopts a plug-in design of the plug rod and the fixing sleeve, combined with the locking system of the slider, clamping plate, and slot, to achieve a quick and accurate connection between the rear fan and the alternator body. The engagement of multiple arc-shaped clamping plates with the slot ensures the stability and reliability of the connection.

Description

Technical Field

[0001] This utility model relates to the field of automotive technology, and more specifically, to a rear fan structure for an automotive generator. Background Technology

[0002] In the automotive industry, the maintenance of powertrain cooling components is a key aspect of ensuring engine compartment temperature control and stable operation of the electrical system. Especially in routine maintenance, troubleshooting, and parts replacement, technicians need to frequently access and operate cooling devices. However, in the automotive cooling systems widely used in the market today, cooling components are usually connected to the main structure using traditional bolt fixing methods. This connection method requires the use of specialized tools to install and remove multiple fasteners, which is difficult to operate in the confined space of the engine compartment. It is not only time-consuming but also prone to damage to surrounding components due to improper operation, greatly reducing maintenance efficiency and user experience.

[0003] In today's pursuit of high efficiency in automobile manufacturing and after-sales service, the ability to quickly maintain the temperature regulation device in the engine compartment directly affects the maintenance cycle and operating cost of the entire vehicle. Especially in time-sensitive situations such as emergency repairs and roadside assistance, the complex disassembly and assembly process of traditional fixed structures has become a major obstacle for technicians. Existing heat dissipation component connection structures generally suffer from problems such as difficult positioning, cumbersome disassembly and assembly, and strong tool dependence. In addition, traditional connection methods are not conducive to rapid assembly on the production line, affecting the overall vehicle manufacturing efficiency. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the problems existing in the prior art, this utility model provides a rear fan structure for an automobile generator to solve the technical problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a rear fan structure for an automotive alternator, comprising an alternator body and a rear fan, wherein a quick-connect mechanism is provided between the alternator body and the rear fan, the quick-connect mechanism comprising an insert rod, a fixing sleeve, a slider, a clamping plate, a slot, an abutment block, a sliding sleeve, and an unlocking mechanism, the insert rod being fixed to the outer wall of the alternator body and inserted into the rear fan, the fixing sleeve being inserted into the top of the insert rod, multiple sets of sliders sliding on the outer wall of the fixing sleeve, the clamping plate being fixed to the bottom of multiple sets of sliders, the slot being provided on the outer wall of the insert rod, the abutment block being fixed to the top of multiple sets of sliders, and the sliding sleeve sliding on the outer wall of the fixing sleeve, the unlocking mechanism comprising a mating sleeve, a rotating sleeve, a threaded sleeve, a sliding hole, a compression spring, and a top block, the mating sleeve being fixed to the bottom surface of the sliding sleeve, the rotating sleeve rotating on the outer wall of the fixing sleeve, the threaded sleeve being fixed to the top surface of the rotating sleeve and threadedly connected to the mating sleeve, the sliding hole being provided inside the insert rod, the compression spring being provided inside the sliding hole, and the top block sliding inside the sliding hole and connected to the top of the compression spring.

[0008] The present invention is further configured such that all of the multiple sets of clamping plates are arc-shaped and engaged in the slots, and the rear fan is provided with insertion holes. The insertion holes are provided in multiple sets and are respectively inserted into multiple sets of insertion rods. The arc-shaped design enhances the structural strength of the clamping plates and provides a larger contact area to ensure a stable engagement. The distribution design of multiple sets of insertion holes and insertion rods realizes the precise positioning and uniform force of the rear fan, effectively preventing installation misalignment and operating vibration.

[0009] The present invention is further configured such that the outer walls of the multiple sets of abutment blocks are provided with inclined surfaces, and the top surface of the sliding sleeve is provided with rounded corners. The inclined surface design causes the sliding sleeve to generate radial force when it is pressed down, which causes the abutment blocks to move smoothly inward and achieve automatic locking. The rounded corner structure reduces the frictional resistance and stress concentration when the sliding sleeve and the abutment blocks are in contact, thereby improving the smoothness of the locking action and the service life of the components.

[0010] The present invention is further configured such that the outer wall of the fixed sleeve is provided with a movable groove, and the multiple sets of abutment blocks slide in the multiple sets of movable grooves respectively. The movable groove provides a precise guide track to constrain the abutment blocks to slide only radially without deflection, ensuring that the movement of each abutment block is synchronized and coordinated during the locking process, which greatly improves the accuracy and stability of the connection.

[0011] The present invention is further configured such that a push spring is connected between the inner wall of each of the multiple sets of abutment blocks and the movable groove. Under normal conditions, the push spring generates an outward restoring force to keep the abutment blocks in a pre-tightened state, ensuring that the abutment blocks can automatically reset to the ready-to-lock position after the unlocking operation, thereby improving the reliability and convenience of repeated operations.

[0012] The present invention is further configured such that a sliding groove is provided on the outer wall of the fixed sleeve, and a sliding plate is fixedly provided on the inner wall of the sliding sleeve. Multiple sets of sliding grooves and sliding plates are provided and slidably connected. The sliding grooves and sliding plates form a keyway-type guide structure to prevent the sliding sleeve from rotating when moving axially, ensuring that the movement direction of the sliding sleeve is precise and controllable, and making the locking and unlocking process more stable and reliable.

[0013] The present invention is further configured such that a positioning mechanism is provided below the rotating sleeve. The positioning mechanism includes a mounting ring, a positioning block, a fixing plate, a slide bar, a clamping block, a tension spring, and a positioning groove. The mounting ring is fixed to the bottom surface of the rotating sleeve. Multiple sets of positioning blocks are fixed to the bottom surface of the mounting ring. The fixing plate is fixed to the outer wall of the fixing sleeve. Multiple sets of slide bars are fixed to the top surface of the fixing plate. Multiple sets of clamping blocks slide on the outer walls of multiple sets of slide bars respectively. Multiple sets of tension springs are connected to the inner walls of multiple sets of clamping blocks respectively. The positioning groove is located at the top of multiple sets of clamping blocks and abuts against multiple sets of positioning blocks. This positioning mechanism achieves precise control and automatic positioning of the rotation angle of the rotating sleeve through the circumferential distribution of the positioning blocks and the positioning groove and the elastic locking of the tension spring, preventing accidental rotation and loosening in a vibration environment. At the same time, it provides clear operation feedback so that the operator can perceive the locked state.

[0014] The present invention is further configured such that baffles are fixedly provided on the outer walls of the multiple sets of slide bars. The baffles are provided in multiple sets and abut against the inner walls of the multiple sets of clamping blocks respectively. The baffles prevent the clamping blocks from moving excessively and detaching from the slide bars under the action of the tension spring by limiting the sliding stroke of the clamping blocks, thus forming a safe stroke limit protection mechanism. At the same time, it ensures that the clamping blocks are always kept within the effective working range, thereby improving the reliability and durability of the positioning mechanism after long-term use.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the present invention provides a rear fan structure for an automotive alternator, which has the following advantages:

[0017] 1. The quick-installation mechanism adopts a plug-in design of insert rods and fixing sleeves, combined with a locking system of sliders, clamps, and slots, to achieve a quick and precise connection between the rear fan and the generator body. The engagement of multiple sets of arc-shaped clamps and slots ensures the stability and reliability of the connection, while the sliding mechanism of the abutment block and the movable groove provides precise guidance for the locking action, making the installation process smoother. The push spring provides appropriate elastic support, ensuring that the clamping force is just right, preventing loosening without damaging parts due to excessive tightness. This modular quick-installation design completely changes the traditional situation of cumbersome and tool-dependent installation of automotive cooling components, allowing maintenance personnel to quickly complete the fan installation in the confined engine compartment, greatly improving assembly efficiency and convenience. It is particularly suitable for application in emergency repairs and routine maintenance, meeting the urgent needs of the automotive repair industry for efficient maintenance.

[0018] 2. The unlocking mechanism, through the coordinated design of the sleeve, rotating sleeve, and threaded sleeve, provides a convenient and efficient disassembly solution for the rear fan. The rotational motion is converted into linear thrust through the thread, achieving precise control of the sliding sleeve and thus controlling the release process of the abutment block. The compression spring and top block inside the sliding hole combine to form an automatic ejection device, which can actively push the fixed sleeve and the insertion rod to separate after unlocking, eliminating the need for manual pulling and significantly reducing the difficulty of operation. The rounded corner design reduces friction and wear between components, making the unlocking action smoother and more reliable. This integrated unlocking design does not require the use of professional tools. Maintenance personnel can complete the complex unlocking process simply by rotating the rotating sleeve, significantly reducing the technical requirements and operational difficulty. In emergency maintenance situations, the unlocking mechanism can complete the fan disassembly work in a very short time, greatly improving maintenance efficiency and emergency response capabilities, while reducing the risk of damage to surrounding components caused by improper disassembly.

[0019] 3. The positioning mechanism employs a sophisticated combination of mounting rings, positioning blocks, and positioning grooves, along with an elastic locking system of slide bars, clamping blocks, and tension springs. This achieves accurate positioning and anti-loosening of the rotating sleeve. The distribution design of multiple sets of positioning blocks and positioning grooves ensures that a suitable locking position can be found at any angle. The continuous tension provided by the tension springs firmly holds the clamping blocks in the working position, effectively preventing accidental rotation under the vibration of automobile operation. The baffle limits the sliding range of the clamping blocks, avoiding functional failure caused by excessive sliding. This intelligent positioning design ensures that the rotating sleeve accurately engages in the preset position with each rotation, guaranteeing consistent locking force and preventing damage to parts caused by excessive rotation. This greatly improves the reliability and service life of the connection. At the same time, the positioning mechanism provides clear operational feedback to operators, making the assembly and disassembly process more intuitive and controllable, reducing the risk of misoperation. It is particularly suitable for applications in complex working conditions and harsh environments, solving the industry pain points of easy loosening and inaccurate positioning in traditional connection methods. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a rear fan structure for an automotive generator according to the present invention.

[0021] Figure 2 This is a schematic diagram of the insert rod in this utility model;

[0022] Figure 3 This is a schematic diagram of the unlocking mechanism in this utility model;

[0023] Figure 4 This is a cross-sectional view of the quick-assembly mechanism in this utility model;

[0024] Figure 5 This is a partial structural diagram of the positioning mechanism in this utility model.

[0025] In the diagram: 1. Generator body; 2. Rear fan; 3. Insert rod; 4. Fixing sleeve; 5. Slider; 6. Clamping plate; 7. Slot; 8. Abutment block; 9. Sliding sleeve; 10. Mating sleeve; 11. Rotating sleeve; 12. Threaded sleeve; 13. Sliding hole; 14. Compression spring; 15. Top block; 16. Insertion hole; 17. Movable groove; 18. Push spring; 19. Sliding groove; 20. Slide plate; 21. Mounting ring; 22. Positioning block; 23. Fixing plate; 24. Sliding bar; 25. Clamping block; 26. Tension spring; 27. Positioning groove; 28. Baffle. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0029] Please see Figures 1-5 A rear fan 2 structure for an automotive alternator includes an alternator body 1 and a rear fan 2. A quick-connect mechanism is provided between the alternator body 1 and the rear fan 2. The quick-connect mechanism includes a plug rod 3, a fixing sleeve 4, a slider 5, a clamping plate 6, a slot 7, an abutment block 8, a sliding sleeve 9, and an unlocking mechanism. The plug rod 3 is fixed to the outer wall of the alternator body 1 and plugs into the rear fan 2. The fixing sleeve 4 is plugged into the top end of the plug rod 3. Multiple sets of sliders 5 slide on the outer wall of the fixing sleeve 4. The clamping plate 6 is fixed to the bottom end of the multiple sets of sliders 5. The slot 7 is provided on the outer wall of the plug rod 3. The abutment block 8 is fixed to the top of multiple sets of sliders 5, the sliding sleeve 9 slides on the outer wall of the fixed sleeve 4, and the unlocking mechanism includes a mating sleeve 10, a rotating sleeve 11, a threaded sleeve 12, a sliding hole 13, a compression spring 14, and a top block 15. The mating sleeve 10 is fixed to the bottom surface of the sliding sleeve 9, the rotating sleeve 11 rotates on the outer wall of the fixed sleeve 4, the threaded sleeve 12 is fixed to the top surface of the rotating sleeve 11 and is threadedly connected to the mating sleeve 10, the sliding hole 13 is set inside the insertion rod 3, the compression spring 14 is set inside the sliding hole 13, and the top block 15 slides inside the sliding hole 13 and is connected to the top of the compression spring 14.

[0030] Multiple sets of clamping plates 6 are all arc-shaped and fit into the slots 7. The rear fan 2 has multiple sets of insertion holes 16, which are respectively inserted into multiple sets of insertion rods 3. The arc-shaped design of the clamping plates 6 forms a surface contact with the slots 7 to increase friction. The multiple sets of insertion holes 16 on the rear fan 2 and the insertion rods 3 form a multi-point positioning structure to ensure that the rear fan 2 is installed accurately and the force is evenly distributed.

[0031] The outer walls of multiple sets of abutment blocks 8 are all provided with bevels, and the top surface of the sliding sleeve 9 is provided with rounded corners. The bevel design of the outer wall of the abutment block 8 generates a radial component force when the sliding sleeve 9 is pressed down, pushing the abutment block 8 into the movable groove 17. The rounded corners of the top surface of the sliding sleeve 9 reduce contact resistance and make the sliding smoother.

[0032] The outer wall of the fixed sleeve 4 is provided with a movable groove 17, and multiple sets of abutment blocks 8 slide in the multiple sets of movable grooves 17 respectively. The movable groove 17 provides a precise radial guide channel for the abutment blocks 8, restricting the abutment blocks 8 to move only radially without deflection, and ensuring that the locking mechanism operates synchronously.

[0033] Push springs 18 are connected between the inner walls of multiple sets of abutment blocks 8 and the movable groove 17. Under normal conditions, the push springs 18 apply an outward pushing force to the abutment blocks 8, keeping the abutment blocks 8 in the extended state. When the sliding sleeve 9 is pressed down, the push springs 18 are compressed and stored energy. After the pressure is released, they can automatically reset.

[0034] The outer wall of the fixed sleeve 4 is provided with a sliding groove 19, and the inner wall of the sliding sleeve 9 is fixed with a sliding plate 20. Multiple sets of sliding grooves 19 and sliding plates 20 are provided and are slidably connected. The sliding grooves 19 and sliding plates 20 form a keyway-type fit structure, which restricts the sliding sleeve 9 to move only along the axial direction and not to rotate, ensuring that the movement trajectory of the sliding sleeve 9 is precise and controllable.

[0035] A positioning mechanism is provided below the rotating sleeve 11. The positioning mechanism includes a mounting ring 21, a positioning block 22, a fixing plate 23, a slide bar 24, a clamping block 25, a tension spring 26, and a positioning groove 27. The mounting ring 21 is fixed to the bottom surface of the rotating sleeve 11. Multiple sets of positioning blocks 22 are fixed to the bottom surface of the mounting ring 21. The fixing plate 23 is fixed to the outer wall of the fixing sleeve 4. Multiple sets of slide bars 24 are fixed to the top surface of the fixing plate 23. Multiple sets of clamping blocks 25 slide on the outer walls of multiple sets of slide bars 24. Multiple sets of tension springs 26 are connected to the inner walls of multiple sets of clamping blocks 25. The positioning groove 27 is located at the top of multiple sets of clamping blocks 25 and abuts against multiple sets of positioning blocks 22. The rotation of the rotating sleeve 11 drives the mounting ring 21 and the positioning block 22 to rotate. The positioning block 22 pushes the clamping block 25 to slide along the slide bar 24 and stretches the tension spring 26. When the positioning block 22 is aligned with the next positioning groove 27, the tension spring 26 contracts, causing the clamping block 25 to return to its original position and lock the positioning block 22, thus achieving angular positioning.

[0036] Each set of slide bars 24 has a baffle 28 fixedly installed on its outer wall. The baffle 28 is provided in multiple sets and abuts against the inner wall of each set of clamping blocks 25. The baffle 28 limits the maximum sliding distance of the clamping blocks 25, preventing the clamping blocks 25 from sliding excessively and detaching from the slide bars 24 under the action of the tension spring 26, thus forming a safe travel limit protection.

[0037] In this embodiment, when the rear fan 2 needs to be quickly installed, multiple sets of insertion holes 16 are inserted into the insertion rod 3, and then the fixing sleeve 4 is inserted into the top of the insertion rod 3. The inner wall of the fixing sleeve 4 pushes the top block 15 to slide along the sliding hole 13 and squeezes the compression spring 14. The rotating sleeve 11 drives the threaded sleeve 12 to rotate and engage with the mating sleeve 10. The mating sleeve 10 pushes the sliding sleeve 9 to slide along the sliding groove 19 through multiple sets of sliding plates 20. The sliding sleeve 9 pushes multiple sets of abutment blocks 8 to slide along the movable groove 17. Block 5 pushes the clamping plate 6 into the slot 7 and compresses multiple sets of push springs 18. The rotating sleeve 11 drives the mounting ring 21 to rotate. The mounting ring 21 drives multiple sets of positioning blocks 22 to push multiple sets of clamping blocks 25 to slide along the slide bar 24 and stretch the tension spring 26. Subsequently, the multiple sets of positioning blocks 22 disengage from the multiple sets of positioning grooves 27 and enter the next set of positioning grooves 27. At this time, the multiple sets of tension springs 26 reset and pull the clamping blocks 25 to slide along the slide bar 24 and be clamped on the outer wall of the positioning block 22 through the positioning groove 27, thus positioning the rotating sleeve 11.

[0038] More specifically, when the rear fan 2 needs to be disassembled, rotating the rotating sleeve 11 drives the threaded sleeve 12 to engage with the mating sleeve 10 and pulls the sliding sleeve 9 to release the contact with the multiple sets of abutment blocks 8. The multiple sets of push springs 18 reset and push the abutment blocks 8 to slide along the movable groove 17 and pull the clamping plate 6 through the slider 5, so that the clamping plate 6 disengages from the slot 7 and releases the connection with the insertion rod 3. The compression spring 14 resets and pushes the top block 15, and the top block 15 pushes the fixing sleeve 4 to disengage from the insertion of the insertion rod 3, releasing the fixation of the rear fan 2 and completing the quick disassembly of the rear fan 2.

[0039] In summary, during the use or operation of the overall equipment: when the rear fan 2 needs to be quickly installed, the multiple sets of insertion holes 16 are inserted into the insertion rod 3, and then the fixing sleeve 4 is inserted into the top of the insertion rod 3. The inner wall of the fixing sleeve 4 pushes the top block 15 to slide along the sliding hole 13 and compresses the compression spring 14. The rotating sleeve 11 drives the threaded sleeve 12 to rotate and engage with the mating sleeve 10. The mating sleeve 10 pushes the sliding sleeve 9 to slide along the sliding groove 19 through the multiple sets of sliding plates 20. The sliding sleeve 9 pushes the multiple sets of abutment blocks 8 to slide along the movable groove 17. The rotating sleeve 11 moves by pushing the clamping plate 6 into the slot 7 via the slider 5, which in turn squeezes the multiple sets of push springs 18. The rotating sleeve 11 drives the mounting ring 21 to rotate, and the mounting ring 21 drives the multiple sets of positioning blocks 22 to push the multiple sets of clamping blocks 25 to slide along the slide bar 24 and stretch the tension springs 26. Subsequently, the multiple sets of positioning blocks 22 disengage from the multiple sets of positioning grooves 27 and enter the next set of positioning grooves 27. At this time, the multiple sets of tension springs 26 reset and pull the clamping blocks 25 to slide along the slide bar 24 and be clamped on the outer wall of the positioning block 22 through the positioning groove 27, thus positioning the rotating sleeve 11.

[0040] When the rear fan 2 needs to be disassembled, rotating the rotating sleeve 11 drives the threaded sleeve 12 to engage with the mating sleeve 10 and pulls the sliding sleeve 9 to release the contact with the multiple sets of abutment blocks 8. The multiple sets of push springs 18 reset and push the abutment blocks 8 to slide along the movable groove 17 and pull the clamping plate 6 through the slider 5, so that the clamping plate 6 disengages from the slot 7 and releases the connection with the insertion rod 3. The compression spring 14 resets and pushes the top block 15, and the top block 15 pushes the fixing sleeve 4 to disengage from the insertion of the insertion rod 3, releasing the fixation of the rear fan 2 and completing the quick disassembly of the rear fan 2.

[0041] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rear fan (2) structure for an automotive generator, comprising a generator body (1) and a rear fan (2), characterized in that: A quick-connect mechanism is provided between the generator body (1) and the rear fan (2). The quick-connect mechanism includes a plug rod (3), a fixing sleeve (4), a slider (5), a clamping plate (6), a slot (7), an abutment block (8), a sliding sleeve (9), and an unlocking mechanism. The plug rod (3) is fixed to the outer wall of the generator body (1) and plugged into the rear fan (2). The fixing sleeve (4) is plugged into the top of the plug rod (3). The slider (5) is provided with multiple sets sliding on the outer wall of the fixing sleeve (4). The clamping plate (6) is fixed to the bottom of the multiple sets of sliders (5). The slot (7) is provided on the outer wall of the plug rod (3). The abutment block (8) is fixed to the top of the multiple sets of sliders (5). At the end, the sliding sleeve (9) slides on the outer wall of the fixed sleeve (4). The unlocking mechanism includes a mating sleeve (10), a rotating sleeve (11), a threaded sleeve (12), a sliding hole (13), a compression spring (14), and a top block (15). The mating sleeve (10) is fixed on the bottom surface of the sliding sleeve (9). The rotating sleeve (11) rotates on the outer wall of the fixed sleeve (4). The threaded sleeve (12) is fixed on the top surface of the rotating sleeve (11) and is threadedly connected to the mating sleeve (10). The sliding hole (13) is set inside the insertion rod (3). The compression spring (14) is set inside the sliding hole (13). The top block (15) slides inside the sliding hole (13) and is connected to the top of the compression spring (14).

2. The rear fan structure of an automotive generator according to claim 1, characterized in that: multiple sets of... The clamps (6) are all arc-shaped and are engaged in the slots (7). The rear fan (2) is provided with a socket (16). The socket (16) is provided in multiple sets and is respectively connected to multiple sets of plug rods (3).

3. The rear fan structure of an automotive generator according to claim 2, characterized in that: The outer walls of the multiple sets of abutting blocks (8) are provided with inclined surfaces, and the top surface of the sliding sleeve (9) is provided with rounded corners.

4. The rear fan structure of an automotive generator according to claim 3, characterized in that: The outer wall of the fixed sleeve (4) is provided with a movable groove (17), and multiple sets of abutment blocks (8) slide in multiple sets of movable grooves (17).

5. The rear fan structure of an automotive generator according to claim 4, characterized in that: Each of the multiple sets of abutment blocks (8) is connected to a push spring (18) between its inner wall and the movable groove (17).

6. The rear fan structure of an automotive generator according to claim 5, characterized in that: The outer wall of the fixed sleeve (4) is provided with a sliding groove (19), and the inner wall of the sliding sleeve (9) is fixed with a sliding plate (20). The sliding groove (19) and the sliding plate (20) are provided in multiple sets and are slidably connected.

7. The rear fan structure of an automotive alternator according to claim 6, characterized in that: A positioning mechanism is provided below the rotating sleeve (11). The positioning mechanism includes a mounting ring (21), a positioning block (22), a fixing plate (23), a slide bar (24), a clamping block (25), a tension spring (26), and a positioning groove (27). The mounting ring (21) is fixed to the bottom surface of the rotating sleeve (11). Multiple sets of positioning blocks (22) are fixed to the bottom surface of the mounting ring (21). The fixing plate (23) is fixed to the outer wall of the fixing sleeve (4). Multiple sets of slide bars (24) are fixed to the top surface of the fixing plate (23). Multiple sets of clamping blocks (25) slide on the outer wall of multiple sets of slide bars (24). Multiple sets of tension springs (26) are connected to the inner wall of multiple sets of clamping blocks (25). The positioning groove (27) is located at the top of multiple sets of clamping blocks (25) and abuts against multiple sets of positioning blocks (22).

8. The rear fan structure of an automotive generator according to claim 7, characterized in that: multiple sets of... Each of the slide bars (24) has a baffle (28) fixedly installed on its outer wall. The baffle (28) is provided in multiple sets and abuts against the inner wall of multiple sets of clamping blocks (25).

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