A shock-absorbing pad and motor

Abstract

This invention discloses a shock-absorbing spring pad and a motor to solve the technical problem that existing drum-type spring pads can only achieve elastic deformation on one side and lack overpressure protection. The shock-absorbing spring pad proposed in this invention includes a pad body and several springs connected to the pad body. The springs include a first spring and a second spring, which extend obliquely to both axial sides of the pad body, such that the ends of the first and second springs protrude from the axial sides of the pad body and respectively form support end faces on both axial sides of the shock-absorbing spring pad, used to support external components that apply pressure to the axial sides of the shock-absorbing spring pad. The shock-absorbing spring pad also includes an overpressure prevention structure, which prevents the external component applying pressure to the spring from continuing to move along the compression direction of the spring when any spring is axially compressed to a preset deformation. This invention also proposes a motor that includes the shock-absorbing spring pad described above.

Description

Technical Field

[0001] This invention relates to the field of elastic gasket technology, and in particular to a shock-absorbing elastic gasket with overpressure protection and a motor having the shock-absorbing elastic gasket. Background Technology

[0002] The external rotor cooling fan has a motor component that includes a shaft, a rotor assembly, a stator assembly, and a controller. The stator assembly is rotatably mounted on the shaft, and the rotor assembly is fixed to the shaft and rotatably mounted on the stator assembly. The rotation of the rotor assembly relative to the stator assembly drives the shaft to rotate.

[0003] The rotor assembly includes an end plate extending from the outside to the shaft, with an axial clearance between the end plate and the stator assembly. The external rotor cooling fan also includes shock-absorbing pads installed in the axial clearance between the rotor assembly and the stator assembly for clearance compensation and vibration damping through elastic deformation.

[0004] Existing elastic gaskets for external rotor cooling fans typically employ two drum-shaped elastic gaskets (also known as conical elastic gaskets), as detailed in Chinese Utility Model Patent Publication No. CN203412906U, entitled "Elastic Gasket." The two drum-shaped elastic gaskets are fitted together with opposite bulging directions and installed in the axial gap between the rotor and stator assemblies. The bulging portions of the two drum-shaped elastic gaskets respectively support the rotor and stator assemblies.

[0005] However, this would cause the following technical problems: 1. Each fan requires two elastic gaskets, which increases material and labor costs; 2. The two elastic gaskets have different installation directions. If either elastic gasket is installed in the wrong direction, the gap compensation and vibration reduction effect of the elastic gasket will be greatly reduced. 3. Drum-type spring pads lack overpressure protection. Once the elastic pad is subjected to excessive axial pressure, its elastic recovery ability will decrease, ultimately affecting the gap compensation effect and vibration reduction effect of the spring pad. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, this invention proposes a shock-absorbing spring pad and a motor to solve the technical problem that the drum-type spring pad in the prior art can only achieve elastic deformation on one side and lacks overpressure protection.

[0007] To achieve the above technical objectives, the present invention proposes a shock-absorbing spring pad, comprising a pad body and a plurality of springs connected to the pad body. The plurality of springs include a first spring and a second spring, the first spring and the second spring extending obliquely to both axial sides of the pad body, such that the ends of the first spring and the second spring protrude from both axial sides of the pad body and respectively form the support end faces of the shock-absorbing spring pad on both axial sides, for supporting external components that apply pressure to the opposite sides of the shock-absorbing spring pad. The shock-absorbing spring pad also includes an overpressure prevention structure, which prevents the external component applying pressure to the spring from continuing to move along the compression direction of the spring when any of the springs is axially compressed to a preset deformation.

[0008] The shock-absorbing spring pad proposed in this invention can replace the double-sided elastic support function that originally required two drum-type spring pads with a single spring pad, saving a part and reducing material costs and assembly labor costs. Meanwhile, the shock-absorbing spring pad integrates an overpressure prevention structure. After the spring is compressed to a preset deformation, the overpressure prevention structure intervenes to prevent external components from continuing to compress the spring, thereby preventing the spring from undergoing plastic deformation due to overpressure, improving the service life of the shock-absorbing spring pad, and ensuring the long-term stability of the gap compensation and vibration reduction effect of the shock-absorbing spring pad.

[0009] Preferably, the overpressure protection structure includes a first limiting part, which is connected to the end of the spring that is away from the gasket body and extends from that end toward the axial center plane of the gasket body; when the spring is axially compressed to the preset deformation, the end of the first limiting part that is away from the spring is axially flush with the end of the opposite spring.

[0010] By adopting the aforementioned technical solution, the structure of the first limiting part ingeniously utilizes the characteristics of the spring itself as an elastic element. Within the normal elastic working range, the first limiting part moves together with the spring without interfering with the opposite spring and without affecting the normal elastic force output of the shock-absorbing pad. When the spring is compressed to a preset deformation, the end of the first limiting part is flush with the end of the opposite spring in the axial direction, and the two together form a "hard support" to prevent external components from continuing to compress the spring, thereby preventing the spring from undergoing plastic deformation due to excessive compression and ensuring the long-term stability of the spring's elastic recovery capability and elastic force output.

[0011] Preferably, the gasket body has a through hole for a shaft to pass through, one end of the spring is connected to the wall of the through hole, and the other end extends toward the central region of the through hole. A plurality of springs are arranged circumferentially around the through hole, and the end of each spring away from the gasket body is connected to the first limiting part.

[0012] With the aforementioned technical solution, the spring and the first limiting part are concentrated in the through hole area. When the shaft passes through the through hole, multiple first limiting parts surround the shaft and can play a role in circumferentially limiting the shaft. Meanwhile, the structure of the reed extending inward from the hole wall gives the reed a long lever arm, good elastic deformation ability, and the ability to provide stable elastic force.

[0013] Preferably, the first limiting portion extends axially along the shock-absorbing pad, and the first limiting portion has an inner side facing the center of the through hole, and a plurality of the inner sides form a limiting space for circumferentially limiting the shaft.

[0014] Using the aforementioned technical solution, when the shaft passes through the limiting space, the outer circumferential surface of the shaft cooperates with multiple inner surfaces to restrict the radial movement of the shaft, thereby playing a circumferential positioning role for the shaft. This allows the shock-absorbing pad to have the dual functions of elastic support and circumferential limiting of the shaft, eliminating the need for a separate shaft limiting structure and further simplifying the internal structure of the motor. Meanwhile, since the first limiting part is connected to the free end of the spring, the first limiting part moves with the spring during the elastic deformation of the spring, and will not affect the normal elastic operation of the spring.

[0015] Preferably, the limiting space defines a virtual inscribed circle, and the extension length of the first limiting portion along the axial direction of the shock-absorbing pad is less than the radius of the inscribed circle.

[0016] Using the aforementioned technical solution, this structure allows the first limiting part to be bent towards the center plane through a stamping process. The stamping die can directly bend the end of the spring sheet from the axial direction, eliminating the need for secondary connection processes such as welding to form the limiting structure. This simplifies processing, improves the efficiency of one-piece molding, and helps reduce manufacturing costs.

[0017] Preferably, the overpressure protection structure includes a second limiting part, which is disposed on the gasket body. The second limiting part has a first stop end face and a second stop end face formed on both sides of the axial direction of the gasket body. In the natural state where the spring is not compressed, the axial height of the first stop end face is lower than the axial height of the end of the first spring, and the axial height of the second stop end face is lower than the axial height of the end of the second spring.

[0018] Using the aforementioned technical solution, the second limiting part is located on the gasket body, with a first stop end face and a second stop end face formed on its axial sides respectively. In its natural state, the height of the stop end face is lower than the height of the corresponding spring end face. During normal operation, the spring face contacts the external component before the stop end face, and the spring face provides elastic force. When the spring face is compressed to a preset deformation, the external component contacts the stop end face, and the stop end face provides rigid support, preventing the spring face from being further compressed, thereby preventing the spring face from undergoing plastic deformation due to overpressure. This structure is integrally set with the gasket body, requiring no additional parts, and can achieve overpressure protection on both axial sides.

[0019] Preferably, the second limiting part includes a first flange and a second flange formed by folding the gasket body to both sides axially, the end of the first flange forming the first stop end face, and the end of the second flange forming the second stop end face.

[0020] Using the aforementioned technical solution, the first and second flanges are formed by folding the gasket body to both axial sides, respectively, and the stop end face is directly formed by the free end face of the flange. The flanges can be integrally formed with the gasket body through a stamping process, simplifying the manufacturing process. When subjected to pressure from external components, the flange mainly bears axial pressure, is not prone to bending deformation, provides reliable stopping, and can stably prevent the spring from being further compressed.

[0021] Preferably, the first flange and the second flange are disposed on the outer peripheral surface of the gasket body.

[0022] Using the aforementioned technical solution, the first and second flanges are located on the outer peripheral surface of the gasket body, rather than the edge of the inner hole. The outer peripheral surface has ample space, allowing the stamping die to perform the folding operation from the outside. The die structure is simple and easy to process, which helps to improve production efficiency and ensure processing accuracy. Meanwhile, the flange is located on the outer circumference and does not occupy the inner hole space, thus avoiding interference with the spring and the rotating shaft, resulting in a reasonable structural layout.

[0023] Preferably, there are multiple first flanges and multiple second flanges, and the multiple first flanges and multiple second flanges are staggered in the circumferential direction of the gasket body.

[0024] With the aforementioned technical solution, since the first and second flanges are staggered in the circumferential direction and do not overlap with each other in the same circumferential position, the gasket body only needs to bear the tensile deformation of unilateral folding at any flange position. This allows the gasket body to adopt a smaller outer diameter, which is beneficial for the miniaturization of the shock-absorbing pad and its installation in the limited space inside the motor. Meanwhile, the multiple flanges are staggered in the circumferential direction, ensuring the circumferential balance of the stopping force.

[0025] Preferably, the first and second springs are arranged symmetrically with respect to the plane of the gasket body.

[0026] Using the aforementioned technical solution, the first and second springs are symmetrically arranged with respect to the plane of the pad body. This symmetrical arrangement makes the deformation of the first and second springs approximately the same when they are compressed, and the elastic force output on both sides is balanced and consistent. On this basis, the overpressure protection structure can also be symmetrically arranged so that the overpressure protection on both sides is triggered synchronously, avoiding the situation where one spring has been stopped and protected while the other spring is still being compressed, thus ensuring the overall stability and reliability of the shock-absorbing pad. Meanwhile, the symmetrical structure eliminates the need to distinguish between the front and back sides when installing the shock-absorbing pads, thus eliminating the drawback of the two drum-type pads in the existing technology, which suffer from a significant reduction in vibration damping effect due to incorrect installation direction. This improves assembly efficiency and product qualification rate.

[0027] Preferably, the shock-absorbing pad is made of carbon steel, the spring sheet has a material thickness of d, and the preset deformation is H, where H≤5d.

[0028] By employing the aforementioned technical solution, limiting the preset deformation H to no more than 5 times the thickness d of the spring material, it can be ensured that the spring remains within its elastic deformation range until it reaches the overpressure stop position. Experimental verification shows that when the compression does not exceed 5 times the material thickness, the spring can fully recover elastically after unloading without plastic deformation, thus maintaining a stable elastic force output over a long period and ensuring the durable and reliable gap compensation and vibration damping effect of the shock-absorbing pad.

[0029] The present invention also proposes an electric motor, including a rotating shaft, a stator assembly and a rotor assembly, wherein the stator assembly is rotatably connected to the rotating shaft, the rotor assembly is rotatably connected to the rotating shaft, the rotor assembly and the stator assembly have an axial gap, and an elastic gasket of any of the foregoing technical solutions is installed in the axial gap.

[0030] The motor proposed in this invention, by employing the shock-absorbing pads of any of the aforementioned technical solutions, possesses all the technical effects of all the aforementioned technical solutions.

[0031] These features and advantages of the present invention will be disclosed in detail in the following detailed description and accompanying drawings. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the shock-absorbing spring pad in an embodiment of the present invention; Figure 2 This is a top view of the shock-absorbing spring pad in an embodiment of the present invention; Figure 3 This is a cross-sectional view of the shock-absorbing spring pad in an embodiment of the present invention.

[0033] Figure label: 100. Gasket body; 110. Through hole; 111. Hole wall; 200, reed; 210, first reed; 220, second reed; 300. Overpressure protection structure; 310. First limiting part; 311. Inner side; 312. Limiting space; 320. Second limiting part; 321. First flange; 3211. First stop end face; 322. Second flange; 3221. Second stop end face. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other technical solutions obtained by those skilled in the art based on the embodiments without creative effort are all within the protection scope of the present invention.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Furthermore, the terms "first" and "second" (if any) are used to distinguish similar objects, not to describe a specific order or sequence. In the description of this invention, unless otherwise stated, "a plurality of" or "several" means two or more, unless otherwise expressly defined.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] like Figures 1 to 3As shown in the embodiment of the present invention, a shock-absorbing spring pad includes a pad body 100 and a plurality of springs 200 connected to the pad body 100. The springs 200 include a first spring 210 and a second spring 220. The first spring 210 and the second spring 220 extend obliquely to both axial sides of the pad body 100, such that the ends of the first spring 210 and the second spring 220 protrude from both axial sides of the pad body 100. The ends of the first spring 210 and the second spring 220 respectively constitute the support end faces on both axial sides of the shock-absorbing spring pad, used to support external components that apply pressure to both axial sides of the shock-absorbing spring pad. When external components (e.g., two corresponding end faces of the stator and rotor assemblies of a motor) apply axial pressure to the shock-absorbing spring pad, the first spring 210 and the second spring 220 undergo elastic deformation, providing axial elastic force to compensate for axial clearance and reduce vibration during operation.

[0039] The shock-absorbing pad also includes an overpressure prevention structure 300. The function of the overpressure prevention structure 300 is to prevent the external component applying pressure to the spring 200 from continuing to move along the compression direction of the spring 200 when any spring 200 is axially compressed to a preset deformation. This prevents the spring 200 from undergoing plastic deformation due to excessive compression and maintains the elastic recovery capability of the spring 200.

[0040] The shock-absorbing spring pad proposed in this invention can replace the double-sided elastic support function that originally required two drum-type spring pads with a single spring pad, saving a part and reducing material costs and assembly labor costs. Meanwhile, the shock-absorbing spring pad integrates an overpressure prevention structure 300. After the spring 200 is compressed to a preset deformation, the overpressure prevention structure 300 intervenes to prevent external components from continuing to compress the spring 200, thereby preventing the spring 200 from undergoing plastic deformation due to overpressure, improving the service life of the shock-absorbing spring pad, and ensuring the long-term stability of the gap compensation and vibration reduction effect of the shock-absorbing spring pad.

[0041] It should be noted that the shock-absorbing pad of the present invention is made of elastic steel, such as carbon steel, spring steel, etc.

[0042] In one embodiment, such as Figures 1 to 3 As shown, the overpressure protection structure 300 includes a first limiting portion 310. The first limiting portion 310 is connected to one end of the spring 200 away from the gasket body 100 (i.e., the free end of the spring 200), and extends from that end toward the axial center plane A1 of the gasket body 100. That is, for the first spring 210 extending obliquely to the first axial side, the first limiting portion 310 extends toward the second axial side (i.e., the direction of the center plane); for the second spring 220 extending obliquely to the second axial side, the first limiting portion 310 extends toward the first axial side (i.e., the direction of the center plane).

[0043] When the spring 200 is axially compressed to a preset deformation, the end of the first limiting part 310 that is away from the spring 200 is axially flush with the end of the opposing spring 200. Taking the first spring 210 as an example, when the first spring 210 is axially compressed to a preset deformation, the first limiting part 310 connected to the first spring 210 moves toward the center plane A1 of the gasket body 100, and its end that is away from the first spring 210 is axially flush with the end of the opposing second spring 220. At this time, the end of the first limiting part 310 and the end of the second spring 220 jointly support the external component that applies pressure to the first spring 210, forming a "hard support", thereby preventing the first spring 210 from being further compressed. The reverse is also true.

[0044] The structure of the first limiting part 310 cleverly utilizes the characteristic of the spring 200 itself as an elastic element. Within the normal elastic working range, the first limiting part 310 moves together with the spring 200 without interfering with the opposite spring 200 and without affecting the normal elastic force output of the shock-absorbing pad. When the spring 200 is compressed to a preset deformation, the end of the first limiting part 310 and the end of the opposite spring 200 are flush in the axial direction. The two together form a "hard support" to prevent external components from continuing to compress the spring 200, thereby preventing the spring 200 from undergoing plastic deformation due to excessive compression and ensuring the long-term stability of the elastic recovery capability and elastic force output of the spring 200.

[0045] In this preferred embodiment, such as Figures 1 to 3 As shown, the gasket body 100 has a through hole 110 for a shaft to pass through. The through hole 110 is located in the central region of the gasket body 100. One end of the spring 200 is connected to the hole wall 111 of the through hole 110, and the other end extends toward the central region of the through hole 110, that is, the spring 200 extends inward from the hole wall 111 of the through hole 110 (towards the center of the through hole 110) in a cantilever shape. A plurality of springs 200 are arranged circumferentially around the through hole 110, and each spring 200 has a first limiting part 310 connected to the end of the spring 200 away from the gasket body 100 (that is, the free end of the spring 200).

[0046] This arrangement concentrates the spring 200 and the first limiting part 310 in the through hole 110 area. When the shaft passes through the through hole 110, the multiple first limiting parts 310 surround the shaft, which can play a circumferential limiting role for the shaft. At the same time, the structure of the spring 200 extending inward from the hole wall 111 gives the spring 200 a long lever arm, good elastic deformation ability, and the ability to provide stable elastic force.

[0047] In a more preferred embodiment, such as Figures 1 to 3As shown, the first limiting portion 310 extends along the axial direction of the shock-absorbing pad. Specifically, the first limiting portion 310 is a plate-like structure formed by bending from the free end of the spring 200 toward the center plane A1 of the pad body 100, and its extension direction is generally parallel to the axial direction of the shock-absorbing pad. The first limiting portion 310 has an inner surface 311 facing the center of the through hole 110, and the inner surfaces 311 of multiple first limiting portions 310 together form a limiting space 312, which is used to circumferentially limit the shaft members passing through the through hole 110.

[0048] Specifically, multiple inner surfaces 311 together form a limiting space 312 in the shape of a polygonal through hole 110. When the shaft passes through this limiting space 312, the outer circumferential surface of the shaft cooperates with the multiple inner surfaces 311, restricting the radial movement of the shaft, thereby playing a circumferential positioning role for the shaft. This allows the shock-absorbing pad to have the dual functions of elastic support and circumferential limiting of the shaft, eliminating the need for a separate shaft limiting structure and further simplifying the internal structure of the motor. At the same time, since the first limiting part 310 is connected to the free end of the spring 200, the first limiting part 310 moves with the spring 200 during the elastic deformation of the spring 200, without affecting the normal elastic operation of the spring 200.

[0049] The inner surface 311 can be either a plane or a curved surface.

[0050] Further preferred, such as Figures 1 to 3 As shown, the limiting space 312 formed by multiple inner surfaces 311 defines a virtual inscribed circle O1. The virtual inscribed circle O1 refers to the circle with the largest diameter that can be accommodated within the limiting space 312, and this circle is tangent to each of the inner surfaces 311 of the limiting space 312. The extension length of the first limiting part 310 along the axial direction of the shock-absorbing pad is less than the radius of the inscribed circle O1.

[0051] This structure allows the first limiting part 310 to be bent into shape towards the center surface A1 of the gasket body 100 through a stamping process. The stamping die can directly bend the end of the spring 200 from the axial direction without the need for secondary connection processes such as welding to form the limiting structure. This makes the processing simple, the one-piece molding efficiency high, and helps to reduce manufacturing costs.

[0052] It should be noted that, in order to avoid obscuring the structure, the radius of the inscribed circle O1 shown in the attached figure is smaller than the actual radius of the inscribed circle O1.

[0053] In one embodiment, such as Figures 1 to 3As shown, unlike the previous embodiment, the overpressure protection structure 300 includes a second limiting portion 320, which is disposed on the gasket body 100. The second limiting portion 320 has a first stop end face 3211 and a second stop end face 3221 formed on both sides of the gasket body 100 along its axial direction. In the uncompressed natural state of the spring 200, the axial height of the first stop end face 3211 is lower than the axial height of the end of the first spring 210, and the axial height of the second stop end face 3221 is lower than the axial height of the end of the second spring 220.

[0054] When the first spring 210 is axially compressed to a preset deformation, the external component applying pressure to the first spring 210 contacts the first stop end face 3211. The first stop end face 3211 prevents the external component from further compressing the first spring 210, thereby providing overpressure protection. Similarly, when the second spring 220 is compressed to a preset deformation, the external component applying pressure to the second spring 220 contacts the second stop end face 3221. The second stop end face 3221 prevents the external component from further compressing the second spring 220.

[0055] The second limiting part 320 is provided on the gasket body 100, and a first stop end face 3211 and a second stop end face 3221 are formed on its axial sides respectively. In the natural state, the height of the stop end face is lower than the height of the end of the corresponding spring 200. During normal operation, the spring 200 contacts the external component before the stop end face, and the spring 200 provides elastic force. When the spring 200 is compressed to a preset deformation, the external component contacts the stop end face, and the stop end face provides rigid support to prevent the spring 200 from being further compressed, thereby preventing the spring 200 from undergoing plastic deformation due to overpressure. This structure is integrally set with the gasket body 100, and overpressure protection can be achieved on both axial sides without additional parts.

[0056] This embodiment can be implemented in combination with the foregoing embodiments, or it can be implemented independently.

[0057] When this embodiment is combined with the aforementioned implementation, the first limiting part 310 located at the end of the spring 200 can be referred to as internal overpressure protection, and the second limiting part 320 located on the pad body 100 in this embodiment can be referred to as external overpressure protection. Both overpressure protection structures 300 can be simultaneously provided, forming a double overpressure protection system. These two overpressure protection structures 300 can be positioned and supported at different locations to further improve the reliability of the shock-absorbing pad. Thus, when the external force is small, the spring 200 operates normally and elastically; when the external force reaches a preset deformation, the first limiting part 310 and / or the second limiting part 320 intervene to prevent further compression of the spring 200, ensuring that the spring 200 does not undergo plastic deformation.

[0058] In this preferred embodiment, such as Figures 1 to 3As shown, the second limiting portion 320 includes a first flange 321 and a second flange 322 formed by folding the gasket body 100 to both axial sides. The first flange 321 is folded from the gasket body 100 to a first axial side, and the second flange 322 is folded from the gasket body 100 to a second axial side. A first stop end face 3211 is formed at the end of the first flange 321 (i.e., the free end face of the first flange 321), and a second stop end face 3221 is formed at the end of the second flange 322 (i.e., the free end face of the second flange 322).

[0059] The first flange 321 and the second flange 322 can be integrally formed with the gasket body 100 through a stamping process, that is, punching holes and folding the gasket body 100 to form flanges.

[0060] In actual use, when the external component axially compresses the spring 200 to a preset deformation, the external component simultaneously contacts the first stop end face 3211 of the first flange 321 or the second stop end face 3221 of the second flange 322. The flanged part will not deform, thereby reliably preventing the spring 200 from being further compressed and realizing the pressure protection function.

[0061] The first flange 321 and the second flange 322 are formed by folding the gasket body 100 to both sides axially, respectively, and the stop end face is directly formed by the free end face of the flange. The flange can be integrally formed with the gasket body 100 through a stamping process, which is simple to process; when the flange is squeezed by external parts, it mainly bears axial pressure and is not easy to bend or deform, so the stop is reliable and can stably prevent the spring 200 from being further compressed.

[0062] In a more preferred embodiment, such as Figures 1 to 3 As shown, the first flange 321 and the second flange 322 are disposed on the outer peripheral surface of the gasket body 100, that is, the flange is located at the outermost edge of the gasket body 100, rather than the edge of the inner hole of the gasket body 100.

[0063] The first flange 321 and the second flange 322 are located on the outer peripheral surface of the gasket body 100, rather than on the inner hole edge. The outer peripheral surface has a wide space, and the stamping die performs the folding operation from the outside. The die structure is simple and easy to process, which helps to improve production efficiency and ensure processing accuracy. Meanwhile, the flange is located on the outer circumference and does not occupy the inner hole space, thus avoiding interference with the spring 200 and the rotating shaft, resulting in a reasonable structural layout.

[0064] Further preferred, such as Figures 1 to 3As shown, multiple first flanges 321 and multiple second flanges 322 are provided, and the multiple first flanges 321 and multiple second flanges 322 are staggered and spaced apart in the circumferential direction of the gasket body 100. That is, along the circumferential direction of the gasket body 100, the first flanges 321 and the second flanges 322 are arranged alternately, with a second flange 322 between adjacent first flanges 321 and a first flange 321 between adjacent second flanges 322.

[0065] Since the first flange 321 and the second flange 322 are staggered in the circumferential direction and do not overlap with each other in the same circumferential position, the gasket body 100 only needs to bear the tensile deformation of unilateral folding at any flange position. This allows the gasket body 100 to adopt a smaller outer diameter, which is beneficial to the miniaturization of the shock-absorbing pad and its installation in the limited space inside the motor. Meanwhile, the multiple flanges are staggered in the circumferential direction, ensuring the circumferential balance of the stopping force.

[0066] In one embodiment, such as Figures 1 to 3 As shown, the first spring 210 and the second spring 220 are symmetrically arranged with respect to the plane on which the gasket body 100 is located. That is, the first spring 210 and the second spring 220 have the same tilt angle, the same extension length, and the same shape, and are mirror-symmetrical with the plane on which the gasket body 100 is located as the plane of symmetry.

[0067] When the first reed 210 and the second reed 220 are flat, their tilt angles are the same. When the first reed 210 and the second reed 220 are curved plates, their curved bending rotation and curved bending angles are the same.

[0068] The first spring 210 and the second spring 220 are symmetrically arranged with respect to the plane of the pad body 100. This symmetrical arrangement makes the deformation of the first spring 210 and the second spring 220 approximately the same when compressed, and the elastic force output on both sides is balanced and consistent. On this basis, the overpressure protection structure 300 can also be symmetrically arranged so that the overpressure protection on both sides is triggered synchronously, avoiding the situation where one spring 200 has been stopped and protected while the other spring 200 is still under pressure, thus ensuring the overall stability and reliability of the shock-absorbing pad. Meanwhile, the symmetrical structure eliminates the need to distinguish between the front and back sides when installing the shock-absorbing pads, thus eliminating the drawback of the two drum-type pads in the existing technology, which suffer from a significant reduction in vibration damping effect due to incorrect installation direction. This improves assembly efficiency and product qualification rate.

[0069] It should be noted that when the first spring 210 and the second spring 220 are flat, the angle formed by the first spring 210, the second spring 220 and the plane of the gasket body 100 is α, where 5°≤α≤60°.

[0070] In one embodiment, the material thickness of the reed 200 is d, and the preset deformation is H, where H≤5d.

[0071] The technical basis of this relationship is that, through experimental verification on elastic steel (such as carbon steel), when the compression of the spring 200 does not exceed 5 times its material thickness, the spring 200 can fully elastically recover after unloading without plastic deformation. For example, for a spring 200 with a material thickness d=0.25mm, if the preset deformation H is set to not exceed 1.25mm (i.e., 5×0.25=1.25mm), the spring 200 can fully rebound after each compression. By setting the trigger position of the overpressure prevention structure 300 at H≤5d, it can be ensured that the spring 200 always works within the elastic deformation range, thereby maintaining a stable elastic force output over a long period of time. It should be noted that this relationship can be applied to any of the above-mentioned embodiments with the overpressure prevention structure 300, that is, regardless of whether the first limiting part 310, the second limiting part 320, or a combination of the two are used, the preset deformation H can be set to satisfy H≤5d.

[0072] In this embodiment, the measurement of the compression of the spring 200 is based on the flat spring 200 and the angle formed by the plane of the spring 200 and the gasket body 100 being greater than or equal to 5° and less than or equal to 60°.

[0073] It should be noted that the effect is better when the included angle is around 30°. That is, the shock-absorbing pad can achieve a better thinness and provide better elasticity.

[0074] The present invention also proposes an electric motor comprising a shaft, a stator assembly, and a rotor assembly. The stator assembly is rotatably mounted on the shaft, and the rotor assembly is fixedly connected to the shaft and rotatably mounted on the stator assembly. The rotor assembly has an end panel extending from the outside to the shaft, and an axial gap is formed between the end panel and the stator assembly, in which a shock-absorbing pad is installed.

[0075] Specifically, the rotating shaft passes through the through hole 110 of the shock-absorbing spring pad, the pad body 100 is fitted on the rotating shaft, the end of the first spring 210 supports the end plate of the rotor assembly, and the end of the second spring 220 supports the corresponding end face of the stator assembly.

[0076] The elastic force of the reed 200 provides axial preload to the rotor and stator assemblies, compensates for axial clearance, and absorbs vibration during motor operation.

[0077] When the motor is subjected to a large axial impact or excessive assembly pressure, the overpressure protection structure 300 intervenes to prevent the spring 200 from being excessively compressed and undergoing plastic deformation, ensuring the long-term reliable operation of the shock-absorbing pad.

[0078] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A shock-absorbing spring pad, comprising a pad body and a plurality of springs connected to the pad body, wherein the plurality of springs includes a first spring and a second spring, the first spring and the second spring extending obliquely to both axial sides of the pad body such that the ends of the first spring and the ends of the second spring protrude from both axial sides of the pad body and respectively form support end faces on both axial sides of the shock-absorbing spring pad, for supporting external components that apply pressure to both axial sides of the shock-absorbing spring pad. Its features are, The shock-absorbing pad also includes an overpressure prevention structure. When any of the springs is axially compressed to a preset deformation, the overpressure prevention structure prevents the external component applying pressure to the spring from continuing to move along the compression direction of the spring.

2. The shock-absorbing pad as described in claim 1, characterized in that, The overpressure protection structure includes a first limiting part, which is connected to the end of the spring that is away from the gasket body and extends from that end toward the axial center plane of the gasket body; when the spring is axially compressed to the preset deformation, the end of the first limiting part that is away from the spring is axially flush with the end of the opposite spring.

3. The shock-absorbing pad as described in claim 2, characterized in that, The gasket body has a through hole for a shaft to pass through. One end of the spring is connected to the wall of the through hole, and the other end extends toward the central region of the through hole. A plurality of springs are arranged circumferentially around the through hole, and the end of each spring away from the gasket body is connected to the first limiting part.

4. The shock-absorbing pad as described in claim 3, characterized in that, The first limiting portion extends along the axial direction of the shock-absorbing pad and has an inner side facing the center of the through hole. The plurality of inner sides form a limiting space for circumferentially limiting the shaft.

5. The shock-absorbing spring pad as described in claim 4, characterized in that, The limiting space defines a virtual inscribed circle, and the extension length of the first limiting part along the axial direction of the shock-absorbing pad is less than the radius of the inscribed circle.

6. The shock-absorbing pad as described in claim 1, characterized in that, The overpressure prevention structure includes a second limiting part, which is disposed on the gasket body. The second limiting part has a first stop end face and a second stop end face formed on both sides of the axial direction of the gasket body. In the natural state where the spring is not compressed, the axial height of the first stop end face is lower than the axial height of the end of the first spring, and the axial height of the second stop end face is lower than the axial height of the end of the second spring.

7. The shock-absorbing pad as described in claim 6, characterized in that, The second limiting part includes a first flange and a second flange formed by folding the gasket body to both sides in the axial direction, the end of the first flange constitutes the first stop end face, and the end of the second flange constitutes the second stop end face.

8. The shock-absorbing pad as described in claim 7, characterized in that, The first flange and the second flange are disposed on the outer peripheral surface of the gasket body.

9. The shock-absorbing pad as described in claim 8, characterized in that, Both the first flange and the second flange are provided in multiples, and the multiple first flanges and multiple second flanges are arranged alternately in the circumferential direction of the gasket body.

10. An electric motor, comprising a shaft, a stator assembly, and a rotor assembly, wherein the stator assembly is rotatably connected to the shaft, and the rotor assembly is rotatably connected to the shaft, characterized in that, The rotor assembly and the stator assembly have an axial clearance, and a shock-absorbing pad as described in any one of claims 1 to 9 is installed in the axial clearance.

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