Motor waterproof structure and brushless motor

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a motor waterproof structure and a brushless motor. Through the arrangement of the stepped motor waterproof structure, the oil seal and the bearing are installed on the top cover through the steps, so that the distance between the oil seal structure and the bearing is reduced, the whole motor waterproof structure is more compact, and the overall occupied space of the motor is further reduced. And meanwhile, a buffer space is arranged between the bearing and the oil seal structure, so that two parts are prevented from being damaged due to the fact that the oil seal structure abuts against the bearing during installation and use, and the waterproof capability of the whole motor waterproof structure is further improved due to the fact that the opening of the oil seal faces the bearing.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and particularly relates to a motor waterproof structure and a brushless motor. Technical Background

[0002] Brushless motors are widely used in various occasions that require precise control of speed and position, such as electric vehicles, drones, industrial control systems, household appliances and other fields. Due to its many advantages, the brushless motor has become one of the important development directions of modern motor technology. On the basis of ordinary brushless motors, a motor waterproof structure is added, so that the motor can work in humid or underwater environments. Waterproof brushless motors usually have a waterproof grade label, such as IP67, IP68, etc. These numbers represent the dust and waterproof capabilities of the motor.

[0003] In the existing technology, the motor waterproof structure is usually arranged at the part where the motor shaft core extends out to prevent water droplets from flowing axially into the motor interior from the motor shaft core, causing internal damage. The motor waterproof structure usually adopts oil seal waterproofing. By sleeving an oil seal structure on the shaft core, the liquid of the motor is prevented from flowing axially into the motor interior from the shaft core.

[0004] However, when setting the motor waterproof structure in the existing technology, it is usually far from the bearing and provided with a structural isolation layer, so as to prevent the oil seal from falling onto the bearing during the use of the motor or the motor waterproof structure being squeezed to abut against the bearing surface after interference installation, resulting in wear of the oil seal structure and the bearing, and further damaging the motor waterproof structure. And usually the opening of the oil seal is arranged in the direction opposite to the bearing, which can prevent the oil seal structure from being excessively squeezed after interference installation, but this design will make the whole motor waterproof structure too large, which is not suitable for the required small and compact brushless motor. Summary of the Utility Model

[0005] In order to solve the above problems, the utility model provides a motor waterproof structure and a brushless motor. By setting a stepped structure, the extra isolation layer and some connecting parts are reduced, making the whole structure more compact. At the same time, a buffer space is arranged between the oil seal structure and the bearing, avoiding direct contact between the oil seal structure and the bearing during installation and use, and preventing structural damage caused by friction.

[0006] In order to achieve the above object, the utility model is realized through the following technical solutions:

[0007] In a first aspect, the present utility model proposes a motor waterproof structure, which includes a top cover, a shaft core, a bearing, and a oil seal structure; the top cover is provided with a connecting through hole, and the shaft core is disposed through the connecting through hole; a first step, a second step, and a third step are further provided inside the top cover, the bearing and the oil seal structure are sleeved on the outer peripheral side of the shaft core, the bearing is fixedly connected to the third step, and the oil seal structure is sealingly connected to the first step; the second step, the bearing, and the oil seal enclose a buffer space, and a sealing liquid is provided in the buffer space.

[0008] By providing a stepped structure, the distance between the oil seal structure and the bearing is reduced, and the occupied space of the overall top cover is also reduced, making the entire structure more compact. Moreover, a buffer space is provided between the bearing and the oil seal structure for waterproofing, thereby preventing the oil seal structure from abutting against the bearing during installation or use in the case of a compact structure, which may cause wear of the oil seal structure and the bearing. Further, when installed, the opening direction of the oil seal structure is set towards the bearing direction, so that an oil storage layer is further formed inside the oil seal structure and in the buffer space. After filling the sealing liquid in the oil storage layer, the oil storage layer can be turned into a waterproof layer, further enhancing the waterproof ability, and the sealing liquid can also play a buffering role between the oil seal structure and the bearing, further reducing the wear of the oil seal structure and the bearing.

[0009] In some embodiments, the height of the buffer space is 0.3 - 0.5 mm.

[0010] If the buffer structure is too small, the buffering effect will be weakened, while an overly large buffer space will increase the overall height, which may cause the oil seal structure to fall off and is also not conducive to the overall structural compactness.

[0011] In some embodiments, the oil seal structure is provided with an open end and a sealed end, the open end is directed towards the bearing direction, and the sealed end abuts against the first step.

[0012] The open end faces the bearing, and during the installation of the oil seal structure, the deformation generated by interference fits extends inside the buffer space, and the sealed end abuts against the first step to prevent external water seepage from entering the motor interior.

[0013] In some embodiments, the oil seal structure further includes an abutting portion and an oil storage cavity, the abutting portion abuts against the shaft core, and the open end of the oil storage cavity faces the bearing direction.

[0014] The oil seal structure abuts against the shaft core through the abutting portion to provide axial waterproofing for the motor. The oil storage cavity is used to store the waterproof liquid, and since the opening faces the bearing, an oil storage layer is formed in combination with the buffer space.

[0015] In some embodiments, the cross-sectional width of the first step is smaller than the cross-sectional width of the oil seal structure.

[0016] When installing the oil seal structure, it is often installed with interference to make the oil seal structure closely adhere to the shaft core, prevent oil leakage, and also avoid external water stains from flowing into the motor body axially.

[0017] In some embodiments, the first step is provided with a first guiding surface. The second step is provided with a second guiding surface.

[0018] The first guiding surface is used to prevent the shaft core from rigidly colliding with the first step during the installation of the shaft core, which may cause damage to the motor waterproof structure. The second guiding surface is used to facilitate the installation of the oil seal structure.

[0019] In some embodiments, the top cover is provided with an installation through hole, and the diameter of the installation through hole is larger than the diameter of the shaft core.

[0020] An installation through hole is provided in the middle of the top cover, and the installation through hole is larger than the shaft core, preventing the shaft core from making hard contact with the motor waterproof structure and also preventing the shaft core from rotating and jittering to collide with the motor waterproof structure, thus causing oil leakage.

[0021] In some embodiments, the top cover further includes a waterproof groove, the waterproof groove is annularly arranged outside the top cover, and a waterproof sealing ring is arranged in the waterproof groove.

[0022] Through the setting of the waterproof groove, the waterproof ring is clamped on the motor waterproof structure, and further enables the motor waterproof structure to also have the ability of radial waterproofing.

[0023] In some embodiments, the top cover further includes a clamping groove.

[0024] The clamping groove is used to clamp an external structure to make the top cover clamped and fixed.

[0025] In a second aspect, the present utility model provides a brushless motor, which includes the motor waterproof structure of the first aspect, and further includes a rotor assembly, a stator assembly, and a motor housing. The top cover is arranged on the motor housing and forms an internal operation cavity inside. The rotor assembly and the stator assembly are connected inside the internal operation cavity. The motor housing is provided with a clamping portion, and the clamping portion is used to be clamped with the clamping groove.

[0026] By setting the motor waterproof structure, the brushless motor has the functions of axial waterproofing and radial waterproofing, and can further reach the waterproof level of IPX4.

[0027] The beneficial effects of a motor waterproof structure and a brushless motor of the present utility model are:

[0028] By setting a stepped motor waterproof structure, the oil seal and the bearing are installed on the top cover three through steps, thereby reducing the distance between the oil seal structure and the bearing, making the entire motor waterproof structure more compact, and further reducing the occupied space of the whole motor. At the same time, a buffer space is provided between the bearing and the oil seal structure to prevent damage to the two parts caused by the oil seal structure abutting against the bearing during installation and use, and the opening of the oil seal facing the bearing direction further improves the waterproof ability of the entire motor waterproof structure. Description of the Drawings

[0029] Figure 1 A cross-sectional view of the motor waterproof structure of the present invention;

[0030] Figure 2 is Figure 1 an enlarged view of part a;

[0031] Figure 3 A cross-sectional view of the oil seal structure of the present invention;

[0032] Figure 4 A cross-sectional view of the top cover structure of the present invention;

[0033] Figure 5 is Figure 4 an enlarged view of part b;

[0034] Figure 6 A cross-sectional view of the brushless motor of the present invention.

[0035] Reference Numerals:

[0036] 100, top cover; 110, first step; 111, first guiding surface; 120, second step; 121, second guiding surface; 130, third step; 140, buffer space; 150, mounting through hole; 160, sealing ring; 170, clamping groove;

[0037] 200, shaft core;

[0038] 300, bearing;

[0039] 400, oil seal structure; 410, open end; 420, sealing end; 430, abutting portion; 440, oil storage cavity;

[0040] 510, rotor assembly; 520, stator assembly; 530, motor housing; 540, clamping portion. Detailed Description of the Invention

[0041] It should be noted that, without conflict, the embodiments and technical features in the embodiments of the present invention can be combined with each other. The detailed description in the specific implementation manners should be understood as an explanatory illustration of the gist of the present invention and should not be regarded as an improper limitation of the present invention.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will further describe the specific technical solutions of the present utility model in detail with reference to the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0043] In the embodiments of the present utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0044] In addition, in the embodiments of the present utility model, orientation terms such as "upper", "lower", "left", and "right" are defined relative to the orientation in which the components in the accompanying drawings are schematically placed. It should be understood that these directional terms are relative concepts, which are used for relative description and clarification and may change correspondingly according to the change in the orientation in which the components in the accompanying drawings are placed.

[0045] In the embodiments of the present utility model, unless otherwise clearly specified and defined, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral one; it can be directly connected or indirectly connected through an intermediate medium.

[0046] In the embodiments of the present utility model, the terms "include", "comprise", or any other variant thereof are intended to cover non-exclusive inclusion. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article, or device that includes the element.

[0047] In the embodiments of the present utility model, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present utility model should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant in a specific manner.

[0048] Embodiment 1:

[0049] As Figures 1 to 2As shown in the figure, the utility model provides a waterproof structure for a motor, which includes a top cover 100, a shaft core 200, a bearing 300, and a oil seal structure 400. The top cover 100 is provided with a connecting through hole, and the shaft core 200 is arranged through the connecting through hole. Inside the top cover 100, there are also a first step 110, a second step 120, and a third step 130. The bearing 300 and the oil seal structure 400 are sleeved on the outer peripheral side of the shaft core 200. The bearing 300 is fixedly connected to the third step 130, and the oil seal structure 400 is sealingly connected to the first step 110. The second step 120, the bearing 300, and the oil seal enclose a buffer space 140, and a sealing liquid is arranged in the buffer space 140.

[0050] Specifically, the top cover 100 is set and fixed outside the housing, so that the rotor assembly 510 and the stator assembly 520 are arranged in the closed space formed by the housing and the top cover 100 to prevent water through the top cover 100. At the same time, the top cover 100 is provided with a stepped structure to enable the internal installation and connection of the motor waterproof structure with the stator assembly 520 and the rotor assembly 510, improving the waterproof ability. And axial waterproofing is carried out by setting the oil seal structure 400. When setting the oil seal structure 400, it is arranged on the first step 110. The first step 110 and the side wall form an installation space for the oil seal structure 400, so that the oil seal is limited inside this installation control during installation. The bearing 300 is arranged through the third step 130, and the side wall and the third step 130 form an installation control to fix the bearing 300, so that the bearing 300 is limited on the third step 130. At the same time, the through holes arranged in the middle of the oil seal structure 400 and the bearing 300 both correspond to the installation through hole 150. When the shaft core 200 is installed, it passes through the through hole in the middle of the bearing 300 and the through hole in the middle of the oil seal structure 400 respectively, and extends to the outside through the installation through hole 150. At the same time, during installation, the upper surface of the second step 120 forms a buffer space 140, and after installing the oil seal structure 400 and the bearing 300, the two structures do not abut. The setting of this buffer space 140 can further prevent the oil seal structure 400 and the bearing 300 from abutting. At the same time, generally when installing the oil seal structure 400, an interference fit is often required to make the oil seal structure 400 tightly fit against the shaft core 200, resulting in the oil seal structure 400 being extruded and extending towards the bearing 300. The setting of the buffer space 140 can provide this deformation space. At the same time, since different models of shaft cores 200 and oil seal structures 400 may be used, the deformation of the oil seal structure 400 is often variable. The existence of the buffer space 140 also reduces the calculation of the deformation amount, thereby reducing the development cycle and avoiding the risk of re-designing and opening a mold.

[0051] By setting a stepped structure, the distance between the oil seal structure 400 and the bearing 300 is reduced, and the occupied space of the overall top cover 100 is also reduced, making the whole structure more compact. And a buffer space 140 is provided between the bearing 300 and the waterproof of the oil seal structure 400, thereby preventing the oil seal structure 400 from abutting against the bearing 300 during installation or use in the case of a compact structure, which may otherwise cause wear of the oil seal structure 400 and the bearing 300. Further, when installed, the opening direction of the oil seal structure 400 is set towards the bearing 300, so that an oil storage layer is further formed inside the oil seal structure 400 and in the buffer space 140. After pouring a sealing liquid into the oil storage layer, the oil storage layer can be turned into a waterproof layer, further improving the waterproof ability, and the sealing liquid can also play a buffering role between the oil seal structure 400 and the bearing 300, further reducing the wear between the oil seal structure 400 and the bearing 300.

[0052] Embodiment 2:

[0053] As Figures 3 to 5 shown, based on Embodiment 1, this embodiment further illustrates and optimizes the structure of Embodiment 1.

[0054] In some embodiments, the height of the buffer space 140 is 0.3 - 0.5 mm.

[0055] Specifically, in the design, the height of the buffer space 140, that is, the height between the surface of the second step 120 and the surface of the installed bearing 300, is set to 0.3 - 0.5 mm, and this range can be adjusted in millimeters according to specific use, or a certain range can be expanded according to the situation, such as 0.2 - 0.7 mm, to adapt to some special motor waterproof structures. If the buffer structure is too small, the buffering effect will be weakened, while an overly large buffer space 140 will increase the overall height, which may cause the oil seal structure 400 to fall off and is not conducive to the overall structural compactness.

[0056] In some embodiments, the oil seal structure 400 is provided with an open end 410 and a sealed end 420, and the direction of the open end 410 is towards the bearing 300, and the sealed end 420 abuts against the first step 110.

[0057] Specifically, the oil seal structure 400 is provided with an open end 410 and a sealing end 420. The open end 410 faces the bearing 300 and extends into the buffer space 140 during installation. The sealing end 420 abuts against the first step 110. The side wall of the sealing end 420 abuts against the shaft core 200, and the sealing end 420 abuts against the first step 110 to isolate the external space and the internal space and prevent water from flowing into the motor axially. The open end 410 faces the bearing 300, and during the installation of the oil seal structure 400, the deformation generated by interference fits extends inside the buffer space 140. The sealing end 420 abuts against the first step 110 to prevent external seepage water from entering the interior of the motor.

[0058] In some embodiments, the oil seal structure 400 further includes an abutting portion 430 and an oil storage cavity 440. The abutting portion 430 abuts against the shaft core 200, and the open end 410 of the oil storage cavity 440 faces the bearing 300.

[0059] Specifically, the oil seal structure 400 is usually a skeleton oil seal and further includes a grounding portion and an oil storage cavity 440. The abutting portion 430 includes a main lip and a secondary lip. By abutting against the shaft core 200 with the main lip and the secondary lip, while reducing the contact area between the oil seal structure 400 and the shaft core 200, it also provides axial waterproofing. The oil seal structure 400 abuts against the shaft core 200 through the abutting portion 430 to provide axial waterproofing for the motor. The oil storage cavity 440 is used to store the waterproof liquid, and since the opening faces the bearing 300, an oil storage layer is formed in combination with the buffer space 140.

[0060] In some embodiments, the cross-sectional width of the first step 110 is smaller than the cross-sectional width of the oil seal structure 400.

[0061] Specifically, since the oil seal needs to be installed with interference fits, the cross-section of the oil seal structure 400, that is, the diameter of the entire structure, is often smaller than the cross-sectional width of the first step 110. That is, the first step 110 is annular, so it is smaller than the outer ring of the first step 110. When installing the oil seal structure 400, it is often installed with interference fits to make the oil seal structure 400 closely adhere to the shaft core 200, prevent oil leakage, and also avoid external water stains from flowing into the motor body axially.

[0062] In some embodiments, the first step 110 is provided with a first guiding surface 111. The second step 120 is provided with a second guiding surface 121.

[0063] Specifically, the first guiding surface 111 is used to prevent rigid collision with the shaft core 200 during installation, and can be further designed as an arc surface or an inclined surface. The second guiding surface 121 can also be designed as an inclined surface. Further, the inclination angle of the inclined surface can be coordinated with the size of the installation through-hole 150 required for installation. Since the inclined surface will affect the extrusion degree of the oil seal, that is, the deformation degree, the overall structure can be adjusted through the coordinated design of the second guiding surface 121 and the installation through-hole 150. The first guiding surface 111 is used to prevent the shaft core 200 from damaging the motor waterproof structure due to the rigid collision stress with the first step 110 during the installation of the shaft core 200. The second guiding surface 121 is used to facilitate the installation of the oil seal structure 400.

[0064] In some embodiments, the top cover 100 is provided with an installation through-hole 150, and the aperture of the installation through-hole 150 is larger than the diameter of the shaft core 200.

[0065] Specifically, the installation through-hole 150 is larger than the shaft core 200, which prevents the shaft core 200 from making hard contact with the motor waterproof structure and also prevents the shaft core 200 from jittering during rotation and colliding with the motor waterproof structure, thereby causing oil leakage.

[0066] In some embodiments, the top cover 100 further includes a waterproof groove, the waterproof groove is annularly arranged outside the top cover 100, and a waterproof sealing ring 160 is arranged in the waterproof groove.

[0067] Specifically, a waterproof groove is arranged outside the motor waterproof structure, and by arranging a sealing ring 160 in the waterproof groove, the radial waterproof ability of the motor waterproof structure can be further improved. Preferably, the sealing ring 160 is made of a nitrile rubber waterproof ring or other materials. Through the arrangement of the waterproof groove, the waterproof ring is clamped on the motor waterproof structure, and further the motor waterproof structure also has the ability of radial waterproofing.

[0068] In some embodiments, the top cover 100 further includes a clamping groove 170, the clamping groove 170 is arranged farther from the motor body relative to the waterproof groove, and the housing is provided with a clamping portion 540. The clamping portion 540 clamps the clamping groove 170 so that the clamping body is clamped on the housing. Specifically, the clamping groove 170 clamps the entire motor waterproof structure outside the housing, further forming a sealed space between the housing and the interior of the top cover 100, thereby protecting the stator assembly 520 and the rotor assembly 510. The clamping groove 170 should be arranged at a position farther from the internal structure of the motor than the waterproof ring installation groove so that the waterproof ring structure can perform radial waterproofing.

[0069] In some embodiments, the third step 130 is further provided with a groove, which is arranged away from the second guiding surface 121. Specifically, the depth of the groove is designed according to the cutting tool of the mold, but it should not be too large to prevent the overall structure from being unstable. A groove is provided in the third step 130 for the forming and cutting of the motor waterproof structure. Also, when the bearing 300 is installed, if there are debris, they can be stored in the groove, further enabling the bearing 300 to be installed deeper. The third step 130 further includes a third guiding surface. Specifically, after the oil seal structure 400 is installed, an oil storage layer is formed between the inner cavity of the oil seal structure 400 and the surface of the bearing 300. The oil storage layer can further enhance the waterproof ability of the entire structure. The third guiding surface can be set according to the situation to increase the size of the entire oil storage layer without increasing the height of the additional overall buffer space 140.

[0070] Embodiment 3:

[0071] As Figure 6 shown, this embodiment provides a brushless motor, including the motor waterproof structure in Embodiment 1 and Embodiment 2. It further includes a rotor assembly 510, a stator assembly 520, and a motor housing 530. The top cover 100 is arranged on the motor housing 530 and forms an internal operation cavity inside. The rotor assembly 510 and the stator assembly 520 are connected inside the internal operation cavity. The motor housing 530 is provided with a clamping portion 540, and the clamping portion 540 is used for clamping with the clamping groove 170.

[0072] In some embodiments, in addition to the steps described in Embodiment 1 and Embodiment 2, multiple steps are provided to make the motor waterproof structure fit the internal structure, which can further compress the internal space, make the overall structure more compact, and also reduce the frequent collision of the top cover 100 with the internal structure of the motor caused by the possible vibration of the motor. By setting the motor waterproof structure, the brushless motor has the functions of axial waterproof and radial waterproof, and can further reach the waterproof level of IPX4.

[0073] The serial numbers of the utility model embodiments are only for description and do not represent the superiority or inferiority of the embodiments. The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent device or equivalent process transformation made by using the description and drawings of the present utility model, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A motor waterproof structure, characterized in that: The invention comprises a top cover (100), a shaft core (200), a bearing (300), and an oil seal structure (400); the top cover (100) is provided with a connecting through hole, and the shaft core (200) is arranged through the connecting through hole; the top cover (100) is also provided with a first step (110), a second step (120) and a third step (130); the bearing (300) and the oil seal structure (400) are sleeved on the outer peripheral side of the shaft core (200); the bearing (300) is fixedly connected to the third step (130), and the oil seal structure (400) is sealingly connected to the first step (110); the second step (120), the bearing (300) and the oil seal enclose a buffer space (140), and a sealing liquid is arranged in the buffer space (140).

2. The motor waterproof structure according to claim 1, characterized in that: The buffer space (140) has a height of 0.3-0.5 mm.

3. The motor waterproof structure according to claim 1, characterized in that: The oil seal structure (400) is provided with an open end (410) and a sealing end (420), the open end (410) is oriented toward the bearing (300), and the sealing end (420) abuts against the first step (110).

4. The motor waterproof structure according to claim 3, characterized in that: The oil seal structure (400) further comprises an abutting portion (430) and an oil storage chamber (440), wherein the abutting portion (430) abuts against the shaft core (200), and an open end (410) of the oil storage chamber (440) faces the direction of the bearing (300).

5. The motor waterproof structure according to claim 1, characterized in that: The cross-sectional width of the first step (110) is smaller than the cross-sectional width of the oil seal structure (400).

6. The motor waterproof structure according to claim 1, characterized in that: The first step (110) is provided with a first guide surface (111), and the second step (120) is provided with a second guide surface (121).

7. The motor waterproof structure according to claim 1, characterized in that: The top cover (100) is provided with a mounting through hole (150), and the diameter of the mounting through hole (150) is larger than the diameter of the shaft core (200).

8. The motor waterproof structure according to claim 1, characterized in that: The top cover (100) further comprises a waterproof groove, the waterproof groove is arranged on the outside of the top cover (100), and a waterproof sealing ring (160) is arranged in the waterproof groove.

9. The motor waterproof structure according to claim 8, characterized in that: The top cover (100) further comprises a snap-fit ​​groove (170).

10. A brushless motor, characterized in that: The motor waterproof structure comprises the motor waterproof structure according to any one of claims 1 to 9, and further comprises a rotor assembly (510), a stator assembly (520) and a motor housing (530), wherein the top cover (100) is arranged on the motor housing (530) and forms an internal operating cavity inside, the rotor assembly (510) and the stator assembly (520) are connected inside the internal operating cavity, and the motor housing (530) is provided with a snap-fitting portion (540), and the snap-fitting portion (540) is used to snap-fit ​​with the snap-fitting groove (170) of the top cover (100).

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