Motor end cover die-casting buffer structure

Abstract

The utility model relates to the related technical field of motor end cover processing, in particular to a motor end cover die-casting buffer structure which comprises a die-casting die, and a buffer connecting mechanism is arranged between a buffer plate and a buffer box. According to the die-casting buffering structure for the motor end cover, when a die-casting die is subjected to impact force of molten metal, the impact force is transmitted to the buffering plate to drive the clamping block to enable the buffering block to slide down along the buffering groove, the telescopic rod shrinks in the telescopic pipe, the buffering spring is pressed to absorb and store energy, the buffering effect is achieved, and impact on the buffering box and the die-casting die supporting structure is reduced; when the buffer plate drives the clamping block to move downwards, the first threaded rod is screwed into the threaded groove, connection between the buffer plate and the buffer block is enhanced, the locking ratchet wheel and the locking nut prevent the first threaded rod from rotating reversely and loosening, and the double-insurance effect is achieved; the buffering structure effectively protects die equipment in long-time die-casting operation, and the quality of motor end cover die-casting products is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of motor end cover processing technology, and in particular to a die-cast buffer structure for motor end covers. Background Technology

[0002] The motor end cover is an important component of a motor. Motor end cover manufacturing refers to the process of transforming raw materials into end covers that meet the assembly requirements of the motor through a series of machining processes. The motor end cover primarily supports the motor rotor and protects internal components. During manufacturing, it is crucial to ensure the end cover has precise dimensions and good shape accuracy. For example, the dimensional accuracy of the end cover's center hole directly affects the installation and operational stability of the motor rotor. Excessive deviation in the center hole size can lead to rotor eccentricity after installation, causing vibration and noise during motor operation, and even affecting the motor's lifespan. Sufficient strength and rigidity must also be ensured. During operation, the motor is subjected to various forces, such as electromagnetic forces and centrifugal forces from the rotor. Through appropriate manufacturing processes, it is essential to ensure the end cover can withstand these forces and avoid deformation. One manufacturing method is die-casting of the motor end cover; therefore, a die-casting buffer structure for motor end covers is particularly needed.

[0003] However, in the existing motor end cap die casting process, liquid metal is injected into the die casting mold cavity at a high speed and pressure. When the molten metal fills the cavity instantly, it generates a huge impact force. When die casting aluminum alloy motor end caps, the impact of the aluminum alloy liquid may cause the mold core to shift. The mold core is usually used to form the complex internal shape of the motor end cap, such as the holes for mounting bearings or some special internal protrusions. Once the core shifts, the internal dimensional accuracy of the produced motor end cap will deviate, and it will not meet the requirements of motor assembly. Utility Model Content

[0004] The purpose of this utility model is to provide a die-casting buffer structure for motor end caps to solve the problem mentioned in the background art regarding the existing die-casting buffer structure for motor end caps. However, in the existing die-casting process, liquid metal is injected into the die-casting mold cavity at a high speed and pressure. When the molten metal fills the cavity instantly, it generates a huge impact force. When die-casting aluminum alloy motor end caps, the impact of the molten aluminum alloy may cause the mold core to shift. The mold core is usually used to form the complex internal shape of the motor end cap, such as the holes for mounting bearings or some special internal protrusions. Once the core shifts, the internal dimensional accuracy of the produced motor end cap will deviate, failing to meet the requirements of motor assembly.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a die-casting buffer structure for a motor end cover, including a die-casting mold, a buffer plate fixedly connected to the bottom of the die-casting mold, a rubber pad provided on the surface of the buffer plate, a buffer box slidably connected to the outer side of the rubber pad, and a buffer connection mechanism provided between the buffer plate and the buffer box;

[0006] The buffer connection mechanism includes a buffer pad, a buffer groove, a limiting groove, a telescopic tube, a telescopic rod, a buffer spring, a buffer block, a limiting block, a locking block, a locking groove, a threaded groove, a stop groove, a first threaded rod, a second threaded rod, a stop ratchet, and a locking nut. A buffer pad is fixedly connected to the inner surface of the buffer box. A buffer groove is fixedly connected above the buffer pad. A limiting groove is formed on the inner side of the buffer groove. A telescopic tube is fixedly connected inside the buffer groove. A telescopic rod is slidably connected inside the telescopic tube. A buffer spring is wound around the outer side of the telescopic rod. A buffer block is fixedly connected to the top of the telescopic rod. Limiting blocks are fixedly connected to both sides of the buffer block. Locking blocks are fixedly connected to both ends of the buffer block. A locking groove is formed at the bottom end of the buffer plate. Threaded grooves are formed on the surfaces of both the buffer plate and the locking block. A stop groove is formed on the surface of the locking block. A first threaded rod is threadedly connected inside the threaded groove. A second threaded rod is fixedly connected to the outer end of the first threaded rod. A stop ratchet is slidably connected to the outer side of the second threaded rod. A locking nut is threadedly connected to the surface of the second threaded rod.

[0007] Preferably, multiple sets of rubber pads are provided on the surface of the buffer plate, and are symmetrically arranged at the four corners of the buffer plate with respect to the central axis of the buffer plate.

[0008] Preferably, multiple sets of the buffer pads and buffer grooves are provided inside the buffer box, and are symmetrically arranged at the four feet of the buffer plate with respect to the central axis of the buffer box.

[0009] Preferably, the telescopic rod slides inside the telescopic tube via a buffer spring, and the outer wall dimension of the telescopic rod matches the inner wall dimension of the telescopic tube.

[0010] Preferably, the position of the limiting block corresponds to the position of the limiting groove, and the outer wall dimension of the limiting block matches the inner wall dimension of the limiting groove.

[0011] Preferably, the card block is installed at the bottom of the buffer plate through the card slot, and the outer wall size of the card block matches the inner wall size of the card slot.

[0012] Preferably, the position of the stop ratchet corresponds to the position of the stop groove, and the outer wall size of the stop ratchet matches the inner wall size of the stop groove.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This motor end cover die-casting buffer structure, through the setting of the buffer connection mechanism, when the die-casting mold is subjected to the impact force of molten metal, the impact force is first transmitted to the buffer plate. The buffer plate will move downward with the locking block, and the locking block will push the buffer block to slide downward along the buffer groove. At this time, the telescopic rod retracts in the telescopic tube, and the buffer spring is compressed. The buffer spring uses its own elastic deformation to absorb and store part of the impact force, playing a buffering role, reducing the direct impact force on the buffer box and the entire die-casting mold support structure. The limiting block slides in the limiting groove, ensuring that the buffer block can only move up and down in the specified direction, ensuring the stability and reliability of the buffer mechanism, and preventing the buffer block from shifting or tilting during the movement, thereby affecting the buffering effect. During the movement, when the first threaded rod aligns with the threaded groove on the locking block and the threaded groove on the buffer plate, the first threaded rod will gradually screw into the threaded groove under the action of the thread, further strengthening the connection stability between the buffer plate and the buffer block, and preventing loosening or separation between the buffer plate and the buffer block during repeated impacts. The stop ratchet on the outside of the second threaded rod can prevent the first threaded rod from reversing under impact and vibration, ensuring that the first threaded rod always remains in a tightened state. The locking nut is further tightened on the second threaded rod, playing a double insurance role, further enhancing the stability and reliability of the entire buffer connection mechanism, so that the buffer structure can continuously and effectively play a buffering role in long-term, high-intensity die-casting operations, protecting the die-casting mold and related equipment, while ensuring the quality of the motor end cover die-cast product. Attached Figure Description

[0014] Figure 1 This is a side view of the structure of the present utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the buffer connection mechanism of this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the buffer groove and buffer block of this utility model in cooperation with each other;

[0018] Figure 5 This utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0019] In the diagram: 1. Die-casting mold; 2. Buffer plate; 3. Rubber pad; 4. Buffer box; 5. Buffer connection mechanism; 501. Buffer pad; 502. Buffer groove; 503. Limiting groove; 504. Telescopic tube; 505. Telescopic rod; 506. Buffer spring; 507. Buffer block; 508. Limiting block; 509. Locking block; 510. Locking groove; 511. Threaded groove; 512. Stopping groove; 513. First threaded rod; 514. Second threaded rod; 515. Stopping ratchet; 516. Locking nut. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-5 This utility model provides a technical solution: a motor end cover die-casting buffer structure, including a die-casting mold 1, a buffer plate 2 fixedly connected to the bottom of the die-casting mold 1, a rubber pad 3 provided on the surface of the buffer plate 2, a buffer box 4 slidably connected to the outside of the rubber pad 3, and a buffer connection mechanism 5 provided between the buffer plate 2 and the buffer box 4.

[0022] The buffer connection mechanism 5 includes a buffer pad 501, a buffer groove 502, a limiting groove 503, a telescopic tube 504, a telescopic rod 505, a buffer spring 506, a buffer block 507, a limiting block 508, a locking block 509, a locking groove 510, a threaded groove 511, a stop groove 512, a first threaded rod 513, a second threaded rod 514, a stop ratchet 515, and a locking nut 516. The buffer pad 501 is fixedly connected to the inner surface of the buffer box 4. The buffer groove 502 is fixedly connected above the buffer pad 501. A limiting groove 503 is formed on the inner side of the buffer groove 502. The telescopic tube 504 is fixedly connected inside the buffer groove 502. The telescopic rod 505 is slidably connected inside the telescopic tube 504. A buffer spring is wound around the outer side of the telescopic rod 505. 506. A buffer block 507 is fixedly connected to the top of the telescopic rod 505. Limiting blocks 508 are fixedly connected to both sides of the buffer block 507. Locking blocks 509 are fixedly connected to both ends of the buffer block 507. A locking groove 510 is opened at the bottom end of the buffer plate 2. Threaded grooves 511 are opened on the surfaces of both the buffer plate 2 and the locking blocks 509. A stop groove 512 is opened on the surface of the locking blocks 509. A first threaded rod 513 is threadedly connected inside the threaded groove 511. A second threaded rod 514 is fixedly connected to the outer end of the first threaded rod 513. A stop ratchet 515 is slidably connected to the outer side of the second threaded rod 514. A locking nut 516 is threadedly connected to the surface of the second threaded rod 514. Through the setting of the buffer connection mechanism 5, when the die-casting mold is impacted by molten metal... When the force is applied, the impact force is first transmitted to the buffer plate 2. The buffer plate 2 moves downward with the locking block 509. The locking block 509 pushes the buffer block 507 to slide downward along the buffer groove 502. At this time, the telescopic rod 505 retracts within the telescopic tube 504, and the buffer spring 506 is compressed. The buffer spring 506 uses its own elastic deformation to absorb and store part of the impact force, playing a buffering role and reducing the direct impact force on the buffer box 4 and the entire die-casting mold support structure. The limiting block 508 slides within the limiting groove 503, ensuring that the buffer block 507 can only move up and down in the specified direction, ensuring the stability and reliability of the buffer mechanism, and preventing the buffer block 507 from shifting or tilting during movement, thereby affecting the buffering effect. As the buffer plate 2 moves the locking block 509 downwards, when the first threaded rod 513 aligns with the threaded groove 511 on the locking block 509 and the threaded groove 511 on the buffer plate 2, the first threaded rod 513 will gradually screw into the threaded groove 511 under the action of the thread, further strengthening the connection stability between the buffer plate 2 and the buffer block 507, preventing loosening or separation between the buffer plate 2 and the buffer block 507 during repeated impacts. The stop ratchet 515 on the outside of the second threaded rod 514 can prevent the first threaded rod 513 from reversing under impact and vibration, ensuring that the first threaded rod 513 always remains in a tightened state. The locking nut 516 further tightens the second threaded rod 514, playing a double safety role.This further enhances the stability and reliability of the entire buffer connection mechanism, enabling the buffer structure to continuously and effectively perform its buffering function during long-term, high-intensity die-casting operations, protecting the die-casting mold and related equipment, while ensuring the quality of the die-cast motor end cover.

[0023] Furthermore, multiple sets of rubber pads 3 are arranged on the surface of the buffer plate 2, symmetrically positioned at the four corners of the buffer plate 2 along its central axis. Through the arrangement of the rubber pads 3, when the buffer plate 2 is subjected to impact, the rubber pads 3 can utilize their elastic deformation to initially buffer and disperse the impact force. The rubber pads 3 can absorb part of the impact force, reducing the magnitude of the impact force directly transmitted from the buffer plate 2 to the buffer box 4. Simultaneously, due to their symmetrical distribution at the four corners, the buffer plate 2 can more evenly transmit force to the buffer box 4 when under stress, avoiding localized damage to the buffer structure due to uneven stress. This improves the stability and reliability of the entire buffer structure, further enhancing the protection of the die-casting mold, extending the mold's service life, and helping to ensure the smoothness of the motor end cover die-casting process, thus improving product quality.

[0024] Furthermore, multiple sets of buffer pads 501 and buffer grooves 502 are arranged inside the buffer box 4, and are symmetrically arranged at the four corners of the buffer plate 2 along the central axis of the buffer box 4. Through the arrangement of buffer pads 501 and buffer grooves 502, when the buffer plate 2 moves down and drives the buffer block 507 into the buffer groove 502, the buffer pads 501 can buffer the impact of the buffer block 507, reducing the collision impact force between the buffer block 507 and the buffer groove 502. Multiple sets of symmetrically arranged buffer pads 501 and buffer grooves 502 can buffer and absorb the impact force of the buffer plate 2 from multiple positions, making the buffering effect more uniform and effective, further improving the buffering performance of the entire buffer structure, ensuring that the die-casting mold can be fully protected when it is impacted by molten metal, ensuring the smooth progress of the motor end cover die-casting operation, reducing the risk of production interruption due to mold damage, and improving production efficiency and product quality.

[0025] Furthermore, the telescopic rod 505 slides within the telescopic tube 504 via the buffer spring 506, and the outer wall dimension of the telescopic rod 505 matches the inner wall dimension of the telescopic tube 504. Through the arrangement of the telescopic tube 504, the telescopic rod 505, and the buffer spring 506, when the buffer plate 2 is subjected to impact force, the sliding of the telescopic rod 505 within the telescopic tube 504 can guide the buffer block 507 to move smoothly up and down, ensuring the linearity and stability of the buffering process. When the buffer spring 506 is compressed, it can store a large amount of elastic potential energy, effectively absorbing and consuming the energy of the impact force, converting it into the elastic deformation energy of the spring, thereby greatly reducing the impact force on the entire buffer structure and the die-casting mold. The matching size design of the telescopic rod 505 and the telescopic tube 504 can prevent the telescopic rod 505 from shifting or shaking during the sliding process, ensuring that the buffer spring 506 can stably play its buffering role, further improving the reliability and buffering effect of the buffer mechanism, so that the impact force in the die-casting process of the motor end cover can be better controlled, which is conducive to producing motor end cover products with higher quality and more stable precision.

[0026] Furthermore, the position of the limiting block 508 corresponds to the position of the limiting groove 503, and the outer wall size of the limiting block 508 matches the inner wall size of the limiting groove 503. Through the setting of the limiting groove 503 and the limiting block 508, when the buffer plate 2 is subjected to impact force and drives the buffer block 507 to move, the limiting block 508 can slide precisely within the limiting groove 503, strictly limiting the movement direction of the buffer block 507, so that it can only move up and down in the predetermined direction, avoiding unstable situations such as lateral displacement or rotation of the buffer block 507. This not only ensures the accuracy and reliability of the buffer mechanism in the buffering process, but also prevents damage or failure of the buffer structure due to abnormal movement of the buffer block 507, further improving the stability and safety of the entire buffer structure, providing a more reliable guarantee for the die-casting operation of the motor end cover, helping to improve production efficiency and product qualification rate, and reduce production costs.

[0027] Furthermore, the locking block 509 installs the buffer block 507 at the bottom of the buffer plate 2 through the locking groove 510. The outer wall size of the locking block 509 matches the inner wall size of the locking groove 510. Through the setting of the locking block 509 and the locking groove 510, the buffer block 507 and the buffer plate 2 are tightly connected, ensuring that the buffer block 507 can accurately follow the movement of the buffer plate 2 during the buffering process without loosening or detaching. This tight-fitting connection can effectively transmit the impact force, enabling the buffer mechanism to work normally according to the design requirements, improving the integrity and reliability of the buffer structure, ensuring effective buffer protection for the die-casting mold, facilitating the stable production of motor end cover die-casting, improving product consistency and quality stability, and reducing the probability of buffer failure caused by poor connection.

[0028] Furthermore, the position of the stop ratchet 515 corresponds to the position of the stop groove 512, and the outer wall size of the stop ratchet 515 matches the inner wall size of the stop groove 512. Through the setting of the stop groove 512 and the stop ratchet 515, when the first threaded rod 513 is screwed into the threaded groove 511, the stop ratchet 515 will be locked into the stop groove 512. Its ratchet structure can prevent the first threaded rod 513 from reversing when subjected to external forces such as impact and vibration, thereby ensuring that the connection between the buffer plate 2 and the buffer block 507 always remains tight. This stop device further enhances the stability and reliability of the buffer connection mechanism, prevents the buffer structure from failing due to loose threads during long-term die-casting operations, ensures that the buffer structure can continue to play an effective role, provides stable and reliable buffer protection for the die-casting mold, helps to improve the efficiency and quality of motor end cover die-casting production, and reduces equipment maintenance costs and production risks.

[0029] Working Principle: During the die casting process, when high-temperature molten metal is injected at high speed into the cavity of the die casting mold 1, the resulting powerful impact force acts instantly on the die casting mold 1. At this moment, the buffer structure begins to function. First, multiple sets of rubber pads 3 on the surface of the buffer plate 2 respond quickly. Because they are symmetrically distributed at the four corners of the buffer plate 2, they can evenly bear the impact force from the die casting mold 1. Through their own elastic deformation, they initially disperse and buffer the impact force, reducing the peak impact force directly transmitted to the buffer box 4. This avoids damage to the buffer structure caused by excessive local pressure, while ensuring the uniformity of force on the buffer plate 2. This lays a stable foundation for the subsequent buffering process, helps maintain the stability of the die casting process, and reduces problems such as mold shaking caused by impact. This improves the molding accuracy and quality stability of the motor end cover product, reducing the scrap rate. Next, the buffer plate 2 drives the locking block 509 downwards, which in turn pushes the buffer block 507 downwards along the buffer groove 502. During this process, multiple sets of symmetrically arranged buffer pads 501 and buffer grooves 502 inside the buffer box 4 further enhance the buffering effect. The buffer pads 501 effectively reduce the impact force between the buffer block 507 and the buffer groove 502, evenly absorbing and buffering the impact force from the buffer plate 2 from multiple positions. This makes the buffering effect more comprehensive and efficient, protecting the die-casting mold from damage caused by molten metal impact, ensuring the continuous and stable operation of the die-casting process, avoiding production interruptions due to mold damage, and improving production efficiency. This design ensures consistent quality of the die-cast motor end caps, reducing product defects caused by uneven mold stress. Simultaneously, the telescopic rod 505 retracts within the telescopic tube 504, compressing the buffer spring 506. The matching dimensions of the telescopic rod 505 and the telescopic tube 504 guarantee the linearity and stability of the buffer block 507's movement, preventing deviation or wobbling. This ensures the buffer spring 506 can stably perform its buffering function. The buffer spring 506 stores a large amount of elastic potential energy, converting the impact energy into elastic deformation energy, greatly reducing the impact on the entire buffer structure and die-casting mold. This allows for more precise control of the impact force during the die-casting process of the motor end caps, facilitating the production of motor end caps with higher dimensional accuracy and more stable internal quality. This product meets the high precision and high reliability requirements of motor manufacturing for end caps. During the downward movement of the buffer plate 2 and the locking block 509, when the first threaded rod 513 aligns with the threaded groove 511 on the locking block 509 and the threaded groove 511 on the buffer plate 2, the first threaded rod 513 gradually screws in under the action of the thread, further strengthening the connection stability between the buffer plate 2 and the buffer block 507. This effectively prevents loosening or separation during repeated impacts, ensuring the integrity and reliability of the buffer structure and ensuring the continuous and stable performance of the buffering effect. Furthermore, the stop ratchet 515 on the outer side of the second threaded rod 514 engages in the stop groove 512, and its ratchet structure prevents the first threaded rod 513 from reversing when subjected to external forces such as impact and vibration.To ensure the first threaded rod 513 remains tightened, the locking nut 516 is further tightened onto the second threaded rod 514, forming a double safety net. This further enhances the stability and reliability of the entire buffer connection mechanism, preventing buffer structure failure due to thread loosening during long-term die-casting operations. It ensures the buffer structure can provide stable and reliable buffer protection for the die-casting mold for a long time, reducing equipment maintenance costs and production risks, and improving the overall efficiency of motor end-cover die-casting production, including production efficiency, product quality, and equipment lifespan. This enhances the company's competitiveness in the motor manufacturing field, meets market demand for high-quality motor end covers, and promotes the development of the motor industry. As the die-casting process continues, the buffer structure repeatedly performs the above buffering process, continuously and effectively protecting the die-casting mold and related equipment. This ensures that the die-casting production of each motor end cover can be carried out under stable conditions, improving product consistency and quality stability, reducing defects and scrap caused by mold problems, improving production efficiency and economic benefits, and providing strong support for the production and operation of motor manufacturing enterprises. This completes the application process of a motor end-cover die-casting buffer structure.

[0030] 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.

Claims

1. An electric machine end cap die casting cushioning structure comprising a die casting mold (1), characterized in that: The bottom of the die casting mold (1) is fixedly connected with a buffer plate (2), the surface of the buffer plate (2) is provided with a rubber pad (3), the outer side of the rubber pad (3) is slidably connected with a buffer box (4), and a buffer connecting mechanism (5) is arranged between the buffer plate (2) and the buffer box (4). The buffer connecting mechanism (5) comprises a buffer pad (501), a buffer groove (502), a limiting groove (503), an extension tube (504), an extension rod (505), a buffer spring (506), a buffer block (507), a limiting block (508), a clamping block (509), a clamping groove (510), a threaded groove (511), a stop groove (512), a first threaded rod (513), a second threaded rod (514), a stop ratchet (515) and a locking nut (516), the inner surface of the buffer box (4) is fixedly connected with the buffer pad (501), the upper side of the buffer pad (501) is fixedly connected with the buffer groove (502), the inner side of the buffer groove (502) is provided with the limiting groove (503), the inner side of the buffer groove (502) is fixedly connected with the extension tube (504), the inner side of the extension tube (504) is slidably connected with the extension rod (505), the outer side of the extension rod (505) is wound with the buffer spring (506), the top end of the extension rod (505) is fixedly connected with the buffer block (507), the two sides of the buffer block (507) are fixedly connected with the limiting block (508), the two ends of the buffer block (507) are fixedly connected with the clamping block (509), the bottom end of the buffer plate (2) is provided with the clamping groove (510), the surfaces of the buffer plate (2) and the clamping block (509) are provided with the threaded groove (511), the surface of the clamping block (509) is provided with the stop groove (512), the inner side of the threaded groove (511) is threadedly connected with the first threaded rod (513), the outer end of the first threaded rod (513) is fixedly connected with the second threaded rod (514), the outer side of the second threaded rod (514) is slidably connected with the stop ratchet (515), and the surface of the second threaded rod (514) is threadedly connected with the locking nut (516).

2. A die cast cushioning structure for an electrical machine end cover according to claim 1, wherein: A plurality of rubber pads (3) are arranged on the surface of the buffer plate (2) and are symmetrically arranged at the four corners of the buffer plate (2) along the central axis of the buffer plate (2).

3. The die cast cushioning structure for an electric motor end shield according to claim 1, wherein: A plurality of buffer pads (501) and buffer grooves (502) are arranged in the buffer box (4) and are symmetrically arranged at the four corners of the buffer plate (2) along the central axis of the buffer box (4).

4. The die cast cushioning structure for an electric motor end shield of claim 1 wherein: The extension rod (505) slides in the extension tube (504) through the buffer spring (506), and the outer wall size of the extension rod (505) is consistent with the inner wall size of the extension tube (504).

5. The die cast cushioning structure for an electrical machine end cover of claim 1, wherein: The position of the limiting block (508) corresponds to the position of the limiting groove (503), and the outer wall size of the limiting block (508) is consistent with the inner wall size of the limiting groove (503).

6. A die cast cushioning structure for an electrical machine end cover according to claim 1, wherein: The card block (509) installs the buffer block (507) at the bottom of the buffer plate (2) through the card slot (510), and the outer wall size of the card block (509) is consistent with the inner wall size of the card slot (510).

7. The die cast cushioning structure for an electrical machine end cover of claim 1, wherein: The position of the stop ratchet (515) corresponds to the position of the stop slot (512), and the outer wall size of the stop ratchet (515) is consistent with the inner wall size of the stop slot (512).

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