Balancing adjustment structure for cooling fan of vehicle

Abstract

The application relates to the technical field of fan balancing structures, and discloses a cooling fan balancing adjustment structure for vehicles, which comprises a fixing frame, a side frame, a water tank and a fan blade fixing frame, the inner side of the fixing frame is provided with a fan blade balancing structure for increasing the air flow area through the water tank; the rear of the fan blade balancing structure is provided with a fan blade connecting structure for improving the balance of the fan blade; the lower part of the fan blade connecting structure is provided with a lifting auxiliary structure for improving the axial stability of the fan blade; the fan blade balancing structure comprises a blade shaft end shell, the outer side of the blade shaft end shell is fixedly connected with a fan blade, the application continuously cleans the surface when the brush strip contacts the rotating filter screen, the dustproof effect is ensured, the fan blade dynamic balance failure caused by dust accumulation is avoided, the airflow dead angle is reduced, and the overall heat exchange efficiency and ventilation uniformity are improved under the same overall size.

Description

Technical Field

[0001] This invention relates to the field of fan balancing structure technology, specifically to a balancing adjustment structure for automotive cooling fans. Background Technology

[0002] Automotive cooling fans operate under harsh conditions of high speed and high vibration for extended periods. Due to their own weight, material creep, and fatigue aging from long-term operation, the fan blades are prone to radial misalignment or axial tilting, which disrupts the overall dynamic balance of the impeller. At the same time, dust and impurities carried by the airflow easily adhere to the blade surface, further exacerbating the problem of uneven mass distribution. If the imbalance caused by the above factors cannot be effectively suppressed, it will not only increase the noise and vibration of the fan during operation, but also accelerate the wear of bearings and drive motors, affecting the heat dissipation efficiency and service life of the cooling system. Therefore, how to achieve dynamic support and surface self-cleaning of the fan blades without increasing mechanical friction loss has become the key to improving the balance and stability of automotive cooling fans.

[0003] Patent CN202732503U discloses a balancing adjustment structure for an automotive cooling fan, including a hub. The hub features two counterweight cylinders on one side corresponding to each fan blade position. These counterweight cylinders are integrally formed with the hub and protrude towards the side of the hub, forming a ring arrangement with the fan's axis as the entire structure. Annular reinforcing ribs protruding towards the side of the hub are provided on both the inner and outer sides of the counterweight cylinders on the hub. Radial reinforcing ribs connecting the inner and outer sides of the annular reinforcing ribs are also provided between the counterweight cylinders corresponding to each pair of adjacent fan blades. This patent is specifically designed for automotive cooling fans, enabling convenient and quick balancing adjustments during production without affecting the fan's functionality. It also boasts advantages such as simple structure, easy adjustment, and good overall fan strength. However, this patent still suffers from the problem of dust adhering to the blades affecting balance. Therefore, this patent proposes a balancing adjustment structure for automotive cooling fans to address these issues. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a vehicle cooling fan balance adjustment structure to address the shortcomings of the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a fan blade balancing structure is provided on the inner side of the fixed frame, which is used to increase the air flow area through the water tank. A fan blade connection structure for improving the balance of the fan blades is provided behind the fan blade balancing structure. Below the fan blade connection structure is a lifting auxiliary structure for improving the axial stability of the fan blades. The fan blade balancing structure includes an blade shaft end shell, a fan blade is fixedly connected to the outer side of the blade shaft end shell, a blade ring is fixedly connected to the end of the fan blade away from the blade shaft end shell, a plurality of rotating blades are fixedly connected to the outer surface of the blade ring, an outer ring is fixedly connected to the outer edge of the rotating blades, and four air guide slots are provided on the front side of the fixing frame.

[0006] According to the above technical solution, a motor frame is provided behind the fan blade connecting structure, the motor frame is fixedly connected to the fixing frame, and a drive motor is provided in the middle of the motor frame.

[0007] According to the above technical solution, the fan blade balancing structure further includes short columns, multiple short columns are provided, and the array of multiple short columns is fixed to the inner wall of the blade ring. A filter screen is provided above the short columns, and a buckle is provided above the filter screen. The surface of the buckle has a slot. A frame is fixedly connected to the front side of the fixing bracket. A slot end and an arc-shaped baffle are fixedly connected to the surface of the frame. An insert is slidably connected inside the slot end. A limit block and a brush strip are fixedly connected to the bottom surface of the insert.

[0008] According to the above technical solution, multiple short columns are distributed in a circular equidistant array around the leaf ring, the short columns are slidably connected to the buckle ring, and the slot end is fixedly connected to the insert by bolts.

[0009] According to the above technical solution, the fan blade connection structure includes a motor shaft, a bushing fixedly connected to the front end of the motor shaft, a linkage end fixedly connected to the outer wall of the bushing, an inner cylinder slidably connected to the outer side of the bushing, an external thread fixedly connected to the outer side of the inner cylinder, a slide block slidably connected to the outer side of the external thread, a torsion disc fixedly connected to the outer side of the slide block, and a return spring fixedly connected to the front side of the torsion disc.

[0010] According to the above technical solution, the drive motor shaft inside the motor frame is fixedly connected to the motor shaft, the torsion disc is fixedly connected to the linkage end, the return spring is located between the torsion disc and the blade shaft end shell, and the two ends of the return spring are fixedly connected to the torsion disc and the blade shaft end shell respectively, and the inner shaft cylinder is fixedly connected to the blade shaft end shell.

[0011] According to the above technical solution, the auxiliary structure includes an outer contact ring, an inner abutment ring is provided on the inner side of the outer contact ring, a plurality of magnetic blocks are embedded on the surface of the outer contact ring, an arc-shaped magnet is provided on the bottom surface of the outer contact ring, magnetic clamping grooves are slidably connected to both sides of the arc-shaped magnet, a clamping groove base is fixedly connected to the rear end of the magnetic clamping groove, and a mounting base is fixedly connected to the rear side of the clamping groove base.

[0012] According to the above technical solution, the mounting base is fixed to the motor frame by bolts, and the outer contact ring and the inner abutment ring are both fixedly connected to the blade shaft end shell.

[0013] The present invention, by adopting the above technical solution, can bring the following beneficial effects: The vehicle uses a cooling fan balancing structure that utilizes brushes to continuously clean the surface when they come into contact with the rotating filter. This ensures dust prevention while preventing the fan blades from failing to maintain dynamic balance due to dust accumulation. The introduction of rotating blades and air guide channels redirects some airflow to the four corners of the water tank, expanding the original circular flow area into a near-square shape. This effectively utilizes the space at the four corners of the water tank, reduces dead airflow angles, and thus improves overall heat exchange efficiency and ventilation uniformity within the same external dimensions.

[0014] The vehicle's cooling fan balancing structure, through the cooperation of external threads and a sliding block, allows the impeller end shell to automatically move backward due to inertia and compress the return spring during high-speed rotation. This keeps the filter screen and brush strips separated under normal operating conditions to reduce friction loss and running resistance. When the vehicle is idling or the speed decreases before stopping, the return spring uses its restoring deformation to push the impeller end shell forward to reset, causing the brush strips to automatically adhere to the filter screen for cleaning. This achieves the function of automatically controlling the cleaning timing according to the speed change, ensuring energy saving during high-efficiency operation and timely removal of dust accumulated on the filter screen at low speeds or before stopping, avoiding frequent manual maintenance and improving the reliability and convenience of filter screen self-cleaning.

[0015] The vehicle cooling fan's balancing and adjusting structure utilizes the magnetic repulsion between an arc-shaped magnet and a rotating magnetic block to provide non-contact stable support when the blade shaft end shell rotates. This avoids the gaps and wobble caused by wear in traditional mechanical bearings during long-term use, and actively counteracts the weight of the fan blades themselves and the creep or sinking tendency that may occur during long-term operation through magnetic force. This effectively maintains the relative positional accuracy between the fan blades and surrounding components, ensures the dynamic balance of the fan blades during high-speed rotation, extends the service life of the overall structure, and reduces operating noise. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the entire front of the present invention; Figure 2 This is a rear-view three-dimensional structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the fan blade balancing structure of the present invention; Figure 4 This is a schematic diagram of the frame connection structure of the present invention; Figure 5 For the present invention Figure 4 A magnified structural diagram of A in the middle; Figure 6 This is a schematic diagram of the fan blade connection structure of the present invention; Figure 7 This is a schematic diagram of the structure of the blade shaft end shell of the present invention; Figure 8 For the present invention Figure 7 A magnified structural diagram of B in the diagram; Figure 9 This is a schematic diagram of the mounting base connection structure of the present invention; Figure 10 For the present invention Figure 9 A magnified structural diagram of C.

[0017] In the diagram: 1. Fixing frame; 2. Side frame; 3. Water tank; 4. Fan blade fixing frame; 5. Fan blade balancing structure; 501. Blade shaft end shell; 502. Blade ring; 503. Rotating blade; 504. Outer ring; 505. Air guide duct; 506. Fan blade; 510. Short column; 511. Buckle ring; 512. Slot; 513. Slot end; 514. Insert strip; 515. Limiting block; 516. Brush strip; 517. Filter screen; 518. Arc-shaped baffle; 5 19. Frame; 6. Fan blade connection structure; 601. Motor shaft; 602. Bushing; 603. Linkage end; 604. Torsion disc; 605. Sliding cylinder block; 606. Inner shaft cylinder; 607. External thread; 608. Return spring; 7. Auxiliary structure; 701. Outer contact ring; 702. Inner abutment ring; 703. Magnetic block; 704. Magnetic clamping groove; 705. Arc-shaped magnet; 706. Clamping groove base; 707. Mounting base; 8. Motor frame. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-10 One embodiment of the present invention is: a vehicle cooling fan balance adjustment structure, including a fixing frame 1, a side frame 2, a water tank 3, and a fan blade fixing frame 4. The inner side of the fixing frame 1 is provided with a fan blade balance structure 5 for increasing the air flow area through the water tank 3. A fan blade connection structure 6 for improving the balance of the fan blades 506 is provided behind the fan blade balancing structure 5. Below the fan blade connection structure 6, there is a lifting auxiliary structure 7 for improving the axial stability of the fan blade 506; The fan blade balancing structure 5 includes a blade shaft end shell 501, a fan blade 506 is fixedly connected to the outer side of the blade shaft end shell 501, a blade ring 502 is fixedly connected to the end of the fan blade 506 away from the blade shaft end shell 501, a plurality of rotating blades 503 are fixedly connected to the outer surface of the blade ring 502, an outer ring 504 is fixedly connected to the outer edge of the rotating blades 503, and four air guide slots 505 are provided on the front side of the fixing frame 1.

[0020] A motor frame 8 is provided behind the fan blade connecting structure 6. The motor frame 8 is fixedly connected to the fixed frame 1, and a drive motor is provided in the middle of the motor frame 8.

[0021] The fan blade balancing structure 5 also includes short columns 510, with multiple short columns 510 arranged in an array and fixed to the inner wall of the blade ring 502. A filter screen 517 is arranged above the short columns 510, and a retaining ring 511 is arranged above the filter screen 517. A slot 512 is opened on the surface of the retaining ring 511. A frame 519 is fixedly connected to the front side of the fixing bracket 1. A slot end 513 and an arc-shaped baffle 518 are fixedly connected to the surface of the frame 519. An insert 514 is slidably connected inside the slot end 513. A limit block 515 and a brush strip 516 are fixedly connected to the bottom surface of the insert 514.

[0022] Multiple short posts 510 are arranged in a circular, equidistant array around the leaf ring 502. The short posts 510 are slidably connected to the retaining ring 511, and the slot end 513 is fixedly connected to the insert strip 514 by bolts. When installing the filter screen 517, the small holes at the edge are aligned one-to-one with the short posts 510 fixedly connected to the side of the leaf ring 502. The small holes on the retaining ring 511 are then inserted and fixed to the corresponding short posts 510, so that the retaining ring 511 flattens the filter screen 517 in conjunction with the leaf ring 502. Then, the insert strip 514 is installed into the slot end 513. Inside, the limiting block 515 connected to the side of the insert 514 aligns with the slot 512 on the buckle 511, allowing the insert 514 to limit and fix the buckle 511. Simultaneously, the insert 514, through the brush strip 516 connected to its side, cleans the filter screen 517 upon contact. As the filter screen 517 rotates with the fan blades 506 connected to the blade shaft end housing 501, the airflow at the front of the water tank 3 passes through the gap in the water tank 3, causing dust to be blocked on one side of the filter screen 517, preventing dust from adhering to the fan blades. The blades 506 affect the balance of the fan blades 506 when they rotate. At the same time, the fan blades 506 start to work under the drive motor connected to the blade shaft end shell 501. The rotation of the fan blades 506 drives the connected blade ring 502 and the rotating blades 503 to move together. The rotating blades 503 guide part of the airflow into the air guide slots 505. The airflow passes through the air guide slots 505 and passes through the four corners of the water tank 3, improving the fluid efficiency of the air passing through the water tank 3. The original flow area of ​​the water tank 3 changes from a circle to a square shape. The brush strips 516 continuously clean the surface when they come into contact with the rotating filter screen 517, which not only ensures the dust prevention effect, but also avoids the failure of the dynamic balance of the fan blades 506 due to dust accumulation. The introduction of the rotating blades 503 and the air guide slots 505 redirects part of the airflow to the four corners of the water tank 3, expanding the original circular flow area to a square shape. This effectively utilizes the space at the four corners of the water tank 3 and reduces dead air angles, thereby improving the overall heat exchange efficiency and ventilation uniformity under the same external dimensions.

[0023] The fan blade connection structure 6 includes a motor shaft 601, a bushing 602 fixedly connected to the front end of the motor shaft 601, a linkage end 603 fixedly connected to the outer wall of the bushing 602, an inner cylinder 606 slidably connected to the outer side of the bushing 602, an external thread 607 fixedly connected to the outer side of the inner cylinder 606, a sliding block 605 slidably connected to the outer side of the external thread 607, a torsion disc 604 fixedly connected to the outer side of the sliding block 605, and a return spring 608 fixedly connected to the front side of the torsion disc 604.

[0024] The drive motor shaft inside the motor frame 8 is fixedly connected to the motor shaft 601. The torsion disc 604 is fixedly connected to the linkage end 603. The return spring 608 is located between the torsion disc 604 and the blade shaft end shell 501, and both ends of the return spring 608 are fixedly connected to the torsion disc 604 and the blade shaft end shell 501, respectively. The inner shaft cylinder 606 is fixedly connected to the blade shaft end shell 501. When the blade shaft end shell 501 gradually rotates around the axis from a stationary state under the drive of the drive motor, the motor shaft 601 is driven to rotate, causing the bushing 602 connected to the motor shaft 601 to drive the linkage end 603. 3. During the movement, the linkage end 603, through the connected slide block 605, laterally pushes the external thread 607, causing the inner shaft cylinder 606 and the connected impeller end shell 501 to rotate. As the speed of the motor shaft 601 gradually increases, the inertia of the impeller end shell 501 increases, and the slide block 605 slides along the external thread 607 on the outside of the inner shaft cylinder 606, causing the slide block 605 to fit against the impeller end shell 501. At this time, the slide block 605 and the inner shaft cylinder 606 rotate relative to each other. The slide block 605, through the connected torsion disc 604, causes the return spring 608 to be torsionally deformed, and the vehicle is at idle speed. When the impeller end housing 501 is in a state of flux or about to stop working, as the drive motor reduces the output speed of the motor shaft 601, the return spring 608 restores its deformation, pushing the torsion disc 604 and the slide block 605, causing the impeller end housing 501 to move forward towards the insert 514 to reset. At this time, the insert 514, through the brush strip 516, approaches the filter screen 517 that moves forward with the impeller end housing 501, thereby cleaning the filter screen 517. Through the cooperation of the external thread 607 and the slide block 605, the impeller end housing 501 automatically moves backward due to inertia during high-speed rotation, compressing the return spring 608, thereby... Under normal operating conditions, the filter screen 517 and brush bar 516 are kept separate to reduce friction loss and running resistance. When the vehicle is idling or the speed decreases before stopping, the return spring 608 uses its restoring deformation to push the blade shaft end shell 501 forward to reset, so that the brush bar 516 and filter screen 517 automatically adhere to each other for cleaning. This realizes the function of automatically controlling the cleaning timing according to the speed change, which not only ensures energy saving during high-efficiency operation, but also removes the dust accumulated on the filter screen 517 in time at low speed or before stopping, avoiding frequent manual maintenance and improving the reliability and convenience of the filter screen 517's self-cleaning.

[0025] The auxiliary structure 7 includes an outer contact ring 701, an inner abutment ring 702 is provided on the inner side of the outer contact ring 701, a plurality of magnetic blocks 703 are embedded on the surface of the outer contact ring 701, an arc-shaped magnet 705 is provided on the bottom surface of the outer contact ring 701, a magnet clamping groove 704 is slidably connected to both sides of the arc-shaped magnet 705, a clamping groove base 706 is fixedly connected to the rear end of the magnet clamping groove 704, and a mounting base 707 is fixedly connected to the rear side of the clamping groove base 706.

[0026] The mounting base 707 is fixed to the motor frame 8 with bolts. Both the outer contact ring 701 and the inner abutment ring 702 are fixedly connected to the blade shaft end shell 501. When the blade shaft end shell 501 is rotating, the outer contact ring 701 and the inner abutment ring 702 connected to the inner side of the blade shaft end shell 501 rotate together with it. The mounting base 707, fixed to the motor frame 8, positions the arc-shaped magnet 705 through the clamping groove fixed seat 706 connected to the top. The arc-shaped magnet 705 and the rotating magnetic block 703 located between the outer contact ring 701 and the inner abutment ring 702 are in a repulsive state, allowing the arc-shaped magnet 705 to repel the blade shaft end shell 501 and the connected fan blades 5 through magnetic repulsion. 06 provides support to prevent the fan blades 506 from deforming due to gravity and aging. By utilizing the magnetic repulsion between the arc-shaped magnet 705 and the rotating magnetic block 703, non-contact stable support is provided for the blade shaft end shell 501 when it rotates. This not only avoids the gaps and shaking caused by wear in traditional mechanical bearings during long-term use, but also actively counteracts the weight of the fan blades 506 and the creep or sinking tendency that may occur during long-term operation through magnetic force. This effectively maintains the relative positional accuracy between the fan blades 506 and surrounding components, ensures the dynamic balance of the fan blades 506 when rotating at high speed, extends the service life of the overall structure, and reduces operating noise.

[0027] Working principle: When installing the filter screen 517, the small holes at the edge correspond one-to-one with the short posts 510 fixedly connected to the side of the impeller ring 502. The small holes on the retaining ring 511 are then inserted and fixed to the corresponding short posts 510, causing the retaining ring 511 to flatten the filter screen 517 against the impeller ring 502. Next, the insert strip 514 is installed into the slot end 513, aligning the limiting block 515 connected to the side of the insert strip 514 with the slot 512 on the retaining ring 511. This allows the insert strip 514 to limit and fix the retaining ring 511 while simultaneously cleaning the filter screen 517 upon contact with the brush strip 516 connected to its side. The filter screen 517 is connected to the impeller end shell 501. When the fan blades 506 rotate together, the airflow in front of the water tank 3 passes through the gap of the water tank 3, causing dust to be blocked on one side of the filter screen 517, preventing dust from adhering to the fan blades 506 and affecting the balance of the fan blades 506 during rotation. At the same time, the fan blades 506 start to work under the drive of the drive motor connected to the blade shaft end shell 501. The rotation of the fan blades 506 drives the connected blade ring 502 and the rotating blades 503 to move together, so that the rotating blades 503 guide part of the airflow into the air guide groove 505. The airflow passes through the air guide groove 505 and passes through the four corners of the water tank 3, improving the fluid efficiency of the air passing through the water tank 3, and changing the original flow area of ​​the water tank 3 from a circle to a square shape. When the impeller end shell 501 gradually rotates around its axis from a stationary state under the drive of the drive motor, the motor drive shaft 601 rotates, causing the bushing 602 connected to the motor shaft 601 to drive the linkage end 603 to move. The linkage end 603 then pushes the external thread 607 laterally through the connected slide block 605, causing the inner shaft cylinder 606 and the connected impeller end shell 501 to rotate. As the speed of the motor shaft 601 gradually increases, the inertia of the impeller end shell 501 increases, and the slide block 605 slides along the external thread 607 on the outside of the inner shaft cylinder 606, causing the slide block 605 to fit against the impeller end shell. 501, at this time, the slide block 605 and the inner shaft cylinder 606 rotate relative to each other. The slide block 605 causes the return spring 608 to be deformed by the torsion disk 604. When the vehicle is idling or about to stop working, when the drive motor reduces the output speed of the motor shaft 601, the return spring 608 restores its deformation and pushes the torsion disk 604 and the slide block 605, so that the impeller end shell 501 moves forward to the insert 514 to reset. At this time, the insert 514 moves close to the filter screen 517 that moves close with the impeller end shell 501 through the brush 516, thereby cleaning the filter screen 517. When the blade shaft end shell 501 is in a rotating working state, the outer contact ring 701 and the inner abutment ring 702 connected to the inner side of the blade shaft end shell 501 rotate together with it. The mounting base 707, which is fixed by the motor frame 8, positions the arc-shaped magnet 705 through the clamping groove fixed base 706 connected to the top. The arc-shaped magnet 705 and the rotating magnetic block 703 located between the outer contact ring 701 and the inner abutment ring 702 are in a repulsive state. The arc-shaped magnet 705 provides support for the blade shaft end shell 501 and the connected fan blade 506 through magnetic repulsion, so as to avoid the fan blade 506 from being deformed due to gravity and aging.

[0028] This invention provides a balancing adjustment structure for an automotive cooling fan. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention. All components not explicitly stated in this embodiment can be implemented using existing technologies.

Claims

1. A vehicle cooling fan balancing and adjustment structure, comprising a mounting bracket (1), a side frame (2), a water tank (3), and a fan blade mounting bracket (4), characterized in that: The inner side of the fixed frame (1) is provided with a fan blade balancing structure (5) for increasing the airflow area through the water tank (3). A fan blade connection structure (6) for improving the balance of the fan blades (506) is provided behind the fan blade balancing structure (5). Below the fan blade connection structure (6), a lifting auxiliary structure (7) is provided to improve the axial stability of the fan blade (506). The fan blade balancing structure (5) includes a blade shaft end shell (501), a fan blade (506) is fixedly connected to the outer side of the blade shaft end shell (501), a blade ring (502) is fixedly connected to the end of the fan blade (506) away from the blade shaft end shell (501), a plurality of rotating blades (503) are fixedly connected to the outer surface of the blade ring (502), an outer ring (504) is fixedly connected to the outer edge of the rotating blade (503), and four air guide slots (505) are provided on the front side of the fixing frame (1).

2. The vehicle cooling fan balance adjustment structure according to claim 1, characterized in that: A motor frame (8) is provided behind the fan blade connecting structure (6). The motor frame (8) is fixedly connected to the fixing frame (1). A drive motor is provided in the middle of the motor frame (8).

3. The vehicle cooling fan balance adjustment structure according to claim 2, characterized in that: The fan blade balancing structure (5) also includes short columns (510), and multiple short columns (510) are provided, and the array of multiple short columns (510) is fixed on the inner wall of the blade ring (502). A filter screen (517) is provided above the short columns (510), and a buckle (511) is provided above the filter screen (517). A slot (512) is provided on the surface of the buckle (511). A frame (519) is fixedly connected to the front side of the fixing frame (1). A slot end (513) and an arc-shaped baffle (518) are fixedly connected to the surface of the frame (519). An insert (514) is slidably connected inside the slot end (513). A limit block (515) and a brush strip (516) are fixedly connected to the bottom surface of the insert (514).

4. The vehicle cooling fan balance adjustment structure according to claim 3, characterized in that: Multiple short columns (510) are arranged in a circular equidistant array around the leaf ring (502). The short columns (510) are slidably connected to the buckle (511), and the slot end (513) is fixedly connected to the insert (514) by bolts.

5. The vehicle cooling fan balance adjustment structure according to claim 1, characterized in that: The fan blade connection structure (6) includes a motor shaft (601), a bushing (602) is fixedly connected to the front end of the motor shaft (601), a linkage end (603) is fixedly connected to the outer wall of the bushing (602), an inner cylinder (606) is slidably connected to the outer side of the bushing (602), an external thread (607) is fixedly connected to the outer side of the inner cylinder (606), a sliding block (605) is slidably connected to the outer side of the external thread (607), a torsion disc (604) is fixedly connected to the outer side of the sliding block (605), and a return spring (608) is fixedly connected to the front side of the torsion disc (604).

6. The vehicle cooling fan balance adjustment structure according to claim 5, characterized in that: The drive motor shaft inside the motor frame (8) is fixedly connected to the motor shaft (601). The torsion disc (604) is fixedly connected to the linkage end (603). The reset spring (608) is located between the torsion disc (604) and the blade end shell (501), and the two ends of the reset spring (608) are fixedly connected to the torsion disc (604) and the blade end shell (501) respectively. The inner shaft cylinder (606) is fixedly connected to the blade end shell (501).

7. The vehicle cooling fan balance adjustment structure according to claim 1, characterized in that: The auxiliary structure (7) includes an outer contact ring (701), an inner abutment ring (702) is provided on the inner side of the outer contact ring (701), a plurality of magnetic blocks (703) are embedded on the surface of the outer contact ring (701), an arc-shaped magnet (705) is provided on the bottom surface of the outer contact ring (701), a magnet clamping groove (704) is slidably connected to both sides of the arc-shaped magnet (705), a clamping groove base (706) is fixedly connected to the rear end of the magnet clamping groove (704), and a mounting base (707) is fixedly connected to the rear side of the clamping groove base (706).

8. The vehicle cooling fan balance adjustment structure according to claim 7, characterized in that: The mounting base (707) is fixed to the motor frame (8) by bolts, and the outer contact ring (701) and the inner abutment ring (702) are both fixedly connected to the blade shaft end shell (501).

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