Motor bearing pre-tightening device and bearing pre-tightening structure motor

Abstract

The application provides a motor bearing pre-tightening device and a bearing pre-tightening structure motor, which comprises at least two pre-tightening components arranged in a circumferential direction on a cover body of a motor shell. The pre-tightening component comprises: a locking part arranged on a pre-tightening device mounting part of the cover body of the motor shell and used for fixing and adjusting a pre-tightening force; a sealing part arranged between the locking part and the pre-tightening device mounting part and used for sealing a gap between the locking part and the pre-tightening device mounting part; and a positioning and pressing part rotationally connected to the locking part and used for positioning and pressing a motor bearing in a direction of a motor axis. The application solves the problem that when the motor is installed vertically with the axis downward, the pre-tightening force of the bearing is too large, the wave washer is invalid, and the motor is unstable, vibrates greatly and is noisy, thereby prolonging the service life of the motor.

Description

Technical Field

[0001] This application relates to the field of wind power technology, and more specifically, to a motor bearing preload device. It also relates to a motor with a bearing preload structure including the aforementioned motor bearing preload device. Background Technology

[0002] Motors are typically mounted horizontally, and the corresponding preload device is designed to effectively utilize the elasticity of the bearing pads during horizontal mounting. However, during vertical mounting, the static load weight, rotor weight, motor shaft weight, and forces during operation all act on the bearing pads, causing them to bear forces far exceeding their elastic range. This results in the bearing pads losing their elasticity and failing to provide effective preload. In such cases, the motor will experience surging, impacts, and vibrations during operation. Furthermore, the excessive preload significantly shortens the lifespan of the motor bearings, leading to an overall motor lifespan far below the design lifespan.

[0003] Currently, most motors on the market use preloaded bearing washers. However, preloaded bearing washers are typically used for horizontal shaft installation and cannot be used for vertical shaft installation. When the motor shaft is installed vertically, the combined forces of the static load, rotor weight, and motor shaft weight, plus the forces exerted during operation, far exceed the elastic force of the washers, exceeding their elastic coefficient. This causes the washers to lose their elasticity and may even fail to recover, resulting in surging and impact during motor operation, leading to significant vibration. The bearing preload is the sum of the static load, rotor weight, and motor shaft weight plus the forces exerted during operation. Since this bearing preload far exceeds the required preload, the motor bearing life is significantly shortened, ultimately leading to motor failure. Utility Model Content

[0004] This application provides a motor bearing preload device, which solves the problem that excessive preload force on the motor bearing when the motor is installed with the vertical shaft facing downwards causes the wave pad to fail, resulting in motor slippage, large vibration, and high noise, thus extending the motor's lifespan.

[0005] This application also provides a bearing preload structure motor, which is securely installed, has low vibration, low noise, and stable and reliable performance.

[0006] This application provides a motor bearing preload device, comprising at least two preload components arranged circumferentially on a housing cover, wherein the preload components include:

[0007] A locking element, which is disposed in the pre-tightening device mounting part of the housing cover and is used to fix and adjust the pre-tightening force;

[0008] A sealing element is disposed between the locking element and the pre-tightening device mounting portion to seal the gap between the locking element and the pre-tightening device mounting portion;

[0009] The positioning and clamping component is rotatably connected to the locking component and is used for positioning along the motor axis and clamping the motor bearing.

[0010] In some embodiments, the pre-tightening assembly further includes a limiting member fixed to the bottom surface of the housing cover, the limiting member being used to limit the rotation angle of the positioning locking member.

[0011] In some embodiments, multiple sets of the pre-tightening components are circumferentially evenly distributed in the housing cover.

[0012] In some embodiments, the positioning clamping member includes a connecting portion and a pressing portion. The connecting portion is connected to the locking member, and the pressing portion is connected to the connecting portion in a horizontal direction. The pressing portion carries and clamps the motor bearing in the direction of the motor axis.

[0013] In some embodiments, the crimping portion is formed by the horizontal extension of the connecting portion.

[0014] In some embodiments, the length of the crimping portion is greater than the length of the connecting portion in the horizontal direction.

[0015] This application also provides a bearing preload structure motor, including a housing cover, and an electrical control assembly, a stator, a rotor, a pair of motor bearings and a wave washer disposed in the inner cavity of the housing cover. The housing cover is provided with at least two preload device mounting portions, and further includes at least two motor bearing preload devices as described in any of the above claims, wherein the motor bearing preload devices are disposed in the preload device mounting portions.

[0016] In some embodiments, the housing cover includes an upper housing cover, a middle housing cover, and a lower housing cover. The bearing preload structure motor is disposed on the upper housing cover. The middle housing cover has a first bearing mounting cavity and at least two preload device mounting portions. The lower housing cover has a second bearing mounting cavity. The motor bearing preload device is disposed on the preload device mounting portion. Two motor bearings are respectively disposed in the first bearing mounting cavity and the second bearing mounting cavity. The wave washer is disposed in the second bearing mounting cavity and is placed at the bottom of the bearing.

[0017] In some embodiments, the pre-tightening device mounting portion is a pre-tightening device mounting cavity that extends vertically through the inner cover of the housing.

[0018] When the motor is installed vertically, the bearing preload adjustment device provided in this application can adapt to the force distribution under vertical installation conditions and provide appropriate preload, thus ensuring the waveguide is in a more reasonable elastic state. The preload is adjusted by manually tightening the locking components, ensuring the positioning clamping components evenly press against the motor bearing, allowing the waveguide to operate within a reasonable range and preventing waveguide failure. Simultaneously, proper preload adjustment can reduce axial and radial movement, improving the performance and stability of the motor bearing and ensuring no significant movement, impact, or vibration during motor operation. This not only improves the motor's efficiency and service life but also reduces damage caused by prolonged vibration and noise, ensuring long-term stable operation of the motor.

[0019] Therefore, this application effectively solves the problems of excessive bearing preload leading to shim failure, motor vibration, and high noise when the motor is installed with its vertical shaft facing downwards. It ensures stable and reliable operation of the motor under vertical installation conditions, extending its service life. By adjusting the bearing preload, it ensures the shim functions properly, reducing motor vibration and noise. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This application provides structural schematic diagrams of a bearing preload structure motor according to some embodiments;

[0022] Figure 2 A cross-sectional view of a bearing preload structure motor provided in some embodiments of this application;

[0023] Figure 3 Schematic diagram of a motor bearing preload device provided in other embodiments of this application;

[0024] Figure 4 This is an assembly diagram of a motor bearing preload device provided for other embodiments of this application.

[0025] The attached figures are labeled as follows:

[0026] 1-Machine housing cover; 2-Motor bearing preload device; 3-Motor bearing; 4-Motor shaft; 5-Wave gasket; 6-Electrical control box cover; 7-Electrical control board; 8-Stator core; 9-Rotor core;

[0027] 101 - Upper cover of housing; 102 - Middle cover of housing; 103 - Lower cover of housing; 201 - Locking component; 202 - Sealing component; 203 - Positioning and clamping component; 204 - Limiting component;

[0028] 2031 - Connecting part; 2032 - Crimping part. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0031] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0034] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0035] Motors are typically mounted horizontally, and the corresponding preload device is designed to effectively utilize the elastic properties of the bearing pads during horizontal mounting. However, during vertical mounting, the combined forces of the static load, rotor weight, motor shaft weight, and operating forces act on the bearing pads, exceeding their elastic limit. This causes the bearing pads to lose elasticity and fail, thus failing to provide effective preload. In such cases, the motor will experience surging, impact, and vibration during operation, and the excessive preload significantly shortens bearing life, resulting in an overall motor lifespan far below the design life.

[0036] Therefore, traditional motor preload mechanisms (such as wave pads) fail to adequately consider the uneven force distribution under vertical installation conditions and cannot provide sufficient and appropriate preload, resulting in premature failure of the wave pads.

[0037] Based on this, this application can adjust and fix the preload of the bearing while retaining the elastic function of the wave plate. When the locking device is manually tightened, the positioning clamping device can apply clamping force to the bearing from the bottom of the bearing in the axial direction, and bear the static load weight, rotor weight and motor shaft weight, as well as the external force during operation. The preload can be adjusted by the locking device, so that the static load of the motor, rotor weight and motor shaft weight are evenly distributed through the positioning clamping device, reducing the bearing capacity of the wave plate and preventing the wave plate from overload failure.

[0038] In this application, "multiple" means two or more (including two).

[0039] Please refer to Figure 1 , Figure 2 and Figure 3 This application provides a motor bearing preload device, including at least two preload components. The preload components are distributed circumferentially inside the housing cover 1. A preload device mounting part is provided inside the housing cover 1, and each preload component is respectively disposed in the preload device mounting part.

[0040] The pre-tightening assembly mainly includes a locking element 201, a sealing element 202, and a positioning and clamping element 203. The locking element 201 is disposed on the pre-tightening device mounting part and is used to fix and adjust the pre-tightening force. The sealing element 202 is disposed between the locking element 201 and the pre-tightening device mounting part and is used to seal the gap between the locking element 201 and the pre-tightening device mounting part. The positioning and clamping element 203 is rotatably connected to the locking element 201 and is used for positioning along the motor axis and clamping the motor bearing 3.

[0041] For example, the locking element 201 can be, but is not limited to, a screw, bolt, pin, snap-fit, or clamping element. Correspondingly, the pre-tightening device mounting portion can be a mounting hole, such as a through hole or threaded hole. The locking element 201 is installed inside the pre-tightening device mounting portion of the sealing element 202. The sealing element 202 can be, but is not limited to, a sealing ring, sealing strip, sealant, gasket, etc. The sealing element 202 is installed on the locking element 201 and is disposed between the locking element 201 and the pre-tightening device mounting portion. Under the locking force of the locking element 201, the sealing element 202 can seal the gap between the locking element 201 and the pre-tightening device mounting portion.

[0042] by Figure 3 and Figure 4 For example, the locking component 201 is a screw, the sealing component 202 is an O-ring, the positioning and clamping component 203 is a pressure plate, the O-ring is fitted on the screw and is located at the bottom of the screw head, the positioning and clamping component 203 is threadedly connected to the screw, and the pre-tightening device mounting part can be a screw hole, which is die-cast with the housing cover 1.

[0043] When the motor is installed vertically, the preload of the motor bearing 3 is adjusted by adjusting the screw torque in the bearing preload device. In the initial stage of tightening the screw, the rotation of the screw causes the positioning clamping member 203 to press firmly against the outer ring of the motor bearing 3, forming a preload. The positioning clamping member 203 gradually presses the motor bearing 3, transferring the force distributed across the entire outer ring of the motor bearing 3 to the screw, thus fixing the preload. As the tightening force continues to increase, within a suitable preload range, the pressure applied by the screw to the outer ring of the motor bearing 3 reaches the expected preload value, ensuring that the wave plate 5 can provide appropriate elasticity during normal operation, thereby guaranteeing the smooth operation of the motor.

[0044] When pre-tightening the motor bearing 3 is required, during the screw tightening process, one end of the pressure plate rotates to the precise positioning of the limiting component 204, and the other end of the positioning clamping component 203 is positioned on the outer ring of the motor bearing 3. Continue tightening the screw, and the positioning clamping component 203 presses the motor bearing 3, suspending the static load weight + rotor weight + motor shaft weight, plus the external force applied during operation. Adjusting the screw torque adjusts the bearing pre-tightening force, ensuring that the elasticity of the lower wave pad 5 is within a reasonable range, allowing the wave pad 5 to recover its shape. This prevents surging and impact during motor operation, resulting in low vibration, smooth operation, low noise, and a long motor lifespan.

[0045] This solution improves the stability of the motor under vertical installation conditions and extends the service life of the motor by adjusting the bearing preload and ensuring the proper elasticity of the wave pad 5.

[0046] In one specific embodiment, the pre-tightening assembly further includes a limiting member 204, which is fixed to the bottom surface of the housing cover 1. The limiting member 204 can limit the rotation angle of the positioning clamping member 203. Figure 3 As shown. The limiting member 204 is an L-shaped limiting member 204, which is located on the bottom surface of the inner cover 102 of the housing, and is positioned on one side of the positioning and clamping member 203, with the right-angled side of the limiting member 204 close to the positioning and clamping member 203. The positioning and clamping member 203 can rotate 180° around the axis of the locking member 201 to switch between the pre-tightened position and the open position for the motor bearing 3. The limiting member 204 can prevent the positioning and clamping member 203 from being rotated multiple times and dislodging from the locking member 201.

[0047] Optionally, multiple sets of preload components are circumferentially and evenly distributed in the housing cover 102 of the housing cover 1, thereby providing a uniform preload force for the motor bearing 3 within a horizontal 360° range.

[0048] like Figure 4 As shown. In one specific embodiment, the positioning clamping member 203 includes a connecting portion 2031 and a pressing portion 2032. The connecting portion 2031 is connected to the locking member 201, and the pressing portion 2032 is connected to the connecting portion 2031 in the horizontal direction. The pressing portion 2032 carries and presses the motor bearing 3 along the motor axis. The connecting portion 2031 and the pressing portion 2032 can be plate-shaped, block-shaped, strip-shaped, etc., and can be integrally formed to ensure the connection strength between them.

[0049] For example, the connecting portion 2031 is provided with an external thread, and the positioning clamping member 203 is provided with a threaded hole. The connecting portion 2031 is threadedly connected to the positioning clamping member 203. The crimping portion 2032 is provided on one side of the connecting portion 2031, and the two are provided on the same horizontal plane. The crimping portion 2032 is formed by extending the connecting portion 2031 horizontally.

[0050] Furthermore, the length of the crimping part 2032 is greater than the length of the connecting part 2031, thereby forming a rotational eccentric structure. When rotated to the bearing pre-tightening position, the crimping part 2032 is used to position and press the motor bearing 3. When rotated to the open position, the crimping part 2032 rotates to a position to avoid the motor bearing 3, which can ensure positioning accuracy and pressing force.

[0051] In addition, this application also provides a bearing preload structure motor, including a housing cover 1, an electrical control assembly, a stator, a rotor, a pair of motor bearings 3 and a wave pad 5, wherein the electrical control assembly, the stator, the rotor, the pair of motor bearings 3 and the wave pad 5 are disposed in the inner cavity of the housing cover 1, and the housing cover 1 is provided with at least two preload device mounting parts, each preload device mounting part being provided with a motor bearing preload device 2.

[0052] The rotor includes a rotor core 9, inside which permanent magnet magnetic elements are embedded. Holes for the permanent magnet elements are formed in the rotor core 9, and end seals prevent the permanent magnet elements from shifting or being thrown out of the rotor core 9 during rotor operation. A hole in the middle of the rotor core 9 is used for the interference fit assembly of the motor shaft 4 and the rotor core 9. Motor bearings 3 are installed at both ends of the motor shaft 4. When energized, the rotor assembly drives the load. The stator includes a stator core 8, inside which copper wire windings are embedded. The stator core 8 has slots in which the copper wire windings are embedded.

[0053] The electrical control box includes a motor control board 7 and a control box cover 6. The motor control board 7 is installed inside the upper cover 101 of the housing and controls the start, stop, and running status of the motor. The control box cover 6 and the upper cover 101 of the housing are sealed together by a sealing ring to ensure that the installation environment of the motor control board is waterproof and dustproof.

[0054] The motor bearing preload device 2 can adjust the bearing preload to ensure the proper functioning of the wave plate 5 and reduce motor vibration and noise. The preload adjustment device can adapt to force distribution under vertical installation conditions and provide appropriate preload to prevent wave plate 5 failure. Simultaneously, proper preload adjustment can also reduce axial and radial movement, improving the performance and stability of the motor bearing 3.

[0055] With the motor installed vertically, this device is used to adjust the preload of the motor bearing 3, thereby ensuring that the wave plate 5 is in a more reasonable elastic state. The preload is adjusted by manually tightening the screws to ensure that the positioning clamping element 203 evenly presses against the motor bearing 3, allowing the wave plate 5 to operate within a reasonable range and guaranteeing that there is no significant swaying, impact, or vibration during motor operation. This not only improves the motor's working efficiency and service life but also reduces damage caused by prolonged vibration and noise, ensuring long-term stable operation of the motor.

[0056] In one specific embodiment, the housing cover 1 includes an upper housing cover 101, a middle housing cover 102, and a lower housing cover 103. A bearing preload structure motor is disposed on the upper housing cover 101. The middle housing cover 102 is provided with a first bearing mounting cavity and at least two preload device mounting parts. The lower housing cover 103 is provided with a second bearing mounting cavity. A motor bearing preload device 2 is disposed on the preload device mounting part. Two motor bearings 3 are respectively disposed in the first bearing mounting cavity and the second bearing mounting cavity. A wave pad 5 is disposed in the second bearing mounting cavity and is placed at the bottom of the motor bearing 3.

[0057] The outer diameter of the stator core 8 is tightly fitted with the inner diameter of the lower cover 103 of the housing. The lower end of the middle cover 102 of the housing is connected to and seals the lower cover 103 of the housing, and the upper end of the middle cover 102 of the housing is connected to and seals the upper cover 101 of the housing. Several bearing preload devices are provided on the lower end face of the middle cover 102 of the housing.

[0058] Furthermore, to increase heat dissipation efficiency, several raised heat dissipation ribs can be provided on the outer peripheral surface of the upper cover 101 of the housing. These ribs increase the heat dissipation area and also enhance the strength of the upper cover 101. Similarly, several raised heat dissipation ribs are provided on the upper surface of the control box cover 6, increasing both the heat dissipation area and the strength of the cover. Several raised heat dissipation ribs are also provided on the outer peripheral surfaces of the middle cover 102 and the lower cover 103 of the housing, increasing both the heat dissipation area and the overall strength of the housing. The lower cover 103 has several mesh-covered protrusions on its circumferential surface, further increasing the heat dissipation surface area and enhancing the overall strength of the housing.

[0059] The foregoing has provided a detailed description of the motor bearing preload device and bearing preload structure motor provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An electric machine bearing pre-tensioning device, characterized in that, The pre-tightening assembly comprises at least two pre-tightening assemblies arranged circumferentially on the cover body (1) of the casing, and the pre-tightening assembly comprises: A locking member (201) arranged on the pre-tightening device mounting portion of the cover body (1) of the casing for fixing and adjusting the pre-tightening force; A sealing member (202) arranged between the locking member (201) and the pre-tightening device mounting portion for sealing the gap between the locking member (201) and the pre-tightening device mounting portion; A positioning and pressing member (203) rotationally connected to the locking member (201) for positioning and pressing the motor bearing (3) along the motor axis direction.

2. The electric machine bearing pre-load device of claim 1, wherein, The pre-tightening assembly further comprises a limiting member (204) fixedly arranged on the bottom surface of the cover body (1) of the casing, and the limiting member (204) is used for limiting the rotation angle of the positioning and pressing member (203).

3. The electric machine bearing pre-load device of claim 2, wherein, A plurality of pre-tightening assemblies are uniformly distributed circumferentially in the middle cover (102) of the casing.

4. The electric machine bearing pre-load device of any of claims 1-3, wherein, The positioning and pressing member (203) comprises a connecting portion (2031) connected to the locking member (201) and a pressing portion (2032) connected to the connecting portion (2031) in the horizontal direction, and the pressing portion (2032) bears and presses the motor bearing (3) along the motor axis direction.

5. The electric machine bearing pre-load device of claim 4, wherein, The pressing portion (2032) is formed by horizontal extension of the connecting portion (2031).

6. The electric machine bearing pre-load device of claim 5, wherein, In the horizontal direction, the length of the pressing portion (2032) is greater than the length of the connecting portion (2031).

7. A bearing pre-tightening structure motor, comprising a casing cover body (1), and an electric control assembly, a stator, a rotor, a pair of motor bearings (3) and a wave pad (5) arranged in the inner cavity of the casing cover body (1), characterized in that, The cover body (1) of the casing is provided with at least two pre-tightening device mounting portions, and further comprises at least two motor bearing pre-tightening devices (2) according to any one of claims 1-6, and the motor bearing pre-tightening devices (2) are arranged on the pre-tightening device mounting portions.

8. The bearing pre-load structure motor of claim 7, wherein, The cover body (1) of the casing comprises an upper casing cover (101), a middle casing cover (102) and a lower casing cover (103), the electric control assembly is arranged on the upper casing cover (101), the middle casing cover (102) is provided with a first bearing mounting cavity and at least two pre-tightening device mounting portions, the lower casing cover (103) is provided with a second bearing mounting cavity, two motor bearings (3) are arranged in the first bearing mounting cavity and the second bearing mounting cavity respectively, and the wave pad (5) is arranged in the second bearing mounting cavity and is arranged on the bottom of the motor bearing (3).

9. The bearing pre-load structure motor of claim 8, wherein, The pre-tightening device mounting portion is a pre-tightening device mounting cavity penetrating through the middle casing cover (102) in the vertical direction.

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