An end cap assembly and an external rotor motor

Abstract

An end cover assembly and an outer rotor motor. The present application relates to the field of electromechanics, and particularly relates to an end cover and a protective cover arranged on the end cover, the end cover comprising an end cover body, a through hole is formed on the end cover body, a first ring wall is formed around the through hole and protrudes towards an inner side surface of the protective cover, and a second ring wall is formed in a direction away from a center of the through hole from the first ring wall; a plurality of notches are formed on an outer periphery of the second ring wall, and a first limiting structure is formed on a side surface of the second ring wall facing the protective cover; the protective cover comprises a protective cover body, a third ring wall extending towards the end cover from the protective cover body, and a clamping block formed on the third ring wall in a direction towards the center of the through hole; and a second limiting structure adapted to the first limiting structure is formed on a side surface of the protective cover body facing the end cover, so as to solve the technical problem that a waterproof and dustproof structure of an existing motor is complex, the cost is high, and maintenance is not facilitated.

Description

Technical Field

[0001] This invention relates to the field of electromechanical engineering, and more specifically to an end cap assembly and an external rotor motor. Background Technology

[0002] The working environments of external rotor motors vary greatly. Some external rotor motors operate in harsh environments, some are dusty, and some are prone to water ingress. In particular, the bearing housing of an external rotor motor is both a rotational area and a load-bearing part, so the bearing housing has high requirements for its own working environment. When the external environment of the motor is complex, especially when there is a lot of dust or moisture, it is particularly important to waterproof and dustproof the bearing housing. Existing waterproof and dustproof structures are complex, costly, and not conducive to maintenance. Summary of the Invention

[0003] This invention provides an end cap assembly to solve the technical problems of existing external rotor motors having complex waterproof and dustproof structures, high costs, and difficulties in maintenance. The assembly includes an end cap and a protective cover disposed on the end cap.

[0004] An end cap includes an end cap body, on which a through hole is formed, a first annular wall surrounding the through hole and protruding toward the inner side of the protective cover, and a second annular wall formed from the first annular wall toward the direction away from the center of the through hole; a plurality of notches are formed on the outer periphery of the second annular wall and a first limiting structure is formed on the side of the second annular wall facing the protective cover;

[0005] The protective cover includes a protective cover body, a third annular wall extending toward the end cap, and a locking block formed by the third annular wall toward the center of the through hole. A second limiting structure adapted to the first limiting structure is formed on the side of the protective cover body toward the end cap.

[0006] Each card block corresponds to one of the notches;

[0007] When the protective cover is placed on the through hole, the locking block passes through the notch. Rotating the protective cover allows the third ring wall to be placed between the locking block and the main body of the protective cover, and the second limiting structure to be engaged with the first limiting structure.

[0008] Preferably, the first limiting structure is a groove, and the second limiting structure is a first protrusion, wherein the protrusion can be placed inside the groove.

[0009] Preferably, the first protrusion surface has a first mating surface and a second mating surface. When the card block passes through the notch, and the first protrusion presses against the second ring wall, the rotation of the protective cover allows the first protrusion to slide into the groove along the first mating surface. The protective cover is then rotated again in the same direction to allow the first protrusion to slide out of the groove along the second mating surface.

[0010] Preferably, both the first mating surface and the second mating surface are planar, the main body of the protective cover is a flat plate structure, and the angle between the first mating surface and the main body of the protective cover is greater than the angle between the second mating surface and the main body of the protective cover.

[0011] Preferably, the protective cover is an elastomer.

[0012] Preferably, when the first protrusion is located within the groove, a compressive force is generated between the first protrusion and the groove, and a compressive force is generated between the second annular wall and the locking block.

[0013] Preferably, a hand-held block is formed on the side of the protective cover body facing away from the end cap. The hand-held block includes two ends, and the two ends of the hand-held block point to different grooves.

[0014] Preferably, the end cap has a positioning structure on the side facing the protective cover, and the positioning structure corresponds one-to-one with the groove.

[0015] Preferably, the positioning structure includes a second protrusion, which is strip-shaped and located around the through hole and radially distributed, and the second protrusion corresponds one-to-one with the groove.

[0016] Preferably, the external rotor motor includes the end cover assembly.

[0017] The present invention extends a first annular wall around the circumference of the through hole on the end cover, and then extends a second annular wall so that the protective cover covers the second annular wall, thereby protecting the through hole on the end cover of the motor. The protrusion and groove between the second annular wall and the main body of the protective cover can prevent the protective cover from falling off due to vibration and other factors during the operation of the motor. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the motor structure according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram showing the protective cover and end cap separated according to an embodiment of the present invention;

[0021] Figure 3 This is a front sectional view of the motor according to an embodiment of the present invention;

[0022] Figure 4 This is an embodiment of the present invention. Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 This is a left view of the motor in an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the motor end cover according to an embodiment of the present invention;

[0025] Figure 7 This is an embodiment of the present invention. Figure 6 Enlarged view at point B in the middle;

[0026] Figure 8 This is a schematic diagram of the structure of the first and second mating surfaces in an embodiment of the present invention;

[0027] Figure 9 This is a first-view schematic diagram of the protective cover according to an embodiment of the present invention;

[0028] Figure 10 This is a second-view schematic diagram of the protective cover according to an embodiment of the present invention;

[0029] Figure 11 This is an embodiment of the present invention. Figure 10 Enlarged view at point C;

[0030] Figure 12 This is a third-view schematic diagram of the protective cover according to an embodiment of the present invention;

[0031] Figure 13 This is a schematic diagram showing the dimensions of the protective cover and end cap according to an embodiment of the present invention.

[0032] Wherein: 1-End cap; 2-Protective cover; 101-Through hole; 102-First annular wall; 103-Second annular wall; 104-First protrusion; 105-Notch; 201-Main body of protective cover; 202-Third annular wall; 203-Clamping block; 204-Groove; 1041-First mating surface; 1042-Second mating surface; 3-Handheld block; 4-Second protrusion. Detailed Implementation

[0033] This invention improves the reliability of the external rotor motor protection structure by optimizing the structure of the motor body.

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0036] The working environments of external rotor motors vary greatly. Some are dusty, while others are prone to water ingress. The bearing housing of external rotor motors is particularly important, as it is both a rotational area and a load-bearing part. Therefore, the bearing housing has high requirements for its working environment. When the external environment of the motor is complex, especially when there is a lot of dust or moisture, it is especially important to waterproof and dustproof the bearing housing. Existing waterproof and dustproof structures are complex, costly, and not conducive to maintenance.

[0037] This invention provides an end cover assembly and an external rotor motor to solve the technical problems of existing external rotor motors having complex waterproof and dustproof structures, high costs, and being difficult to maintain. The invention will be described in detail below with reference to the accompanying drawings, taking an external rotor motor using the end cover assembly of this method as an example.

[0038] The following is an example:

[0039] like Figure 1-13 As shown, an external rotor motor includes an end cover 1 and a protective cover 2 disposed on the end cover 1. The end cover 1 includes a main body, and the main body of the protective cover 2 is a flat plate structure, as shown in the figure. Figure 6-7 As shown, the end cap 1 has a through hole 101, a first annular wall 102 surrounding the through hole 101 and protruding towards the inner side of the protective cover 2, and a second annular wall 103 extending from the first annular wall 102 outwards; the outer periphery of the second annular wall 103 has multiple notches 105, and a first limiting structure is formed on the side of the second annular wall 103 facing the protective cover 2; as shown Figure 10-11As shown, the protective cover 2 includes a main body, a third annular wall 202 extending from the main body toward the end cap 1, and a locking block 203 formed by the third annular wall 202 toward the center of the through hole 101. The locking block 203 corresponds one-to-one with the notch 105. A second limiting structure adapted to the first limiting structure is formed on the side of the main body of the protective cover 2 toward the end cap 1. When the protective cover 2 is placed on the through hole 101, the locking block 203 passes through the notch 105. Rotating the protective cover 2 allows the third annular wall 202 to be positioned between the locking block 203 and the protective cover 101. The second limiting structure is engaged with the first limiting structure between the main body of the protective cover 2 and the locking block 203; the second ring wall 103 is placed between the main body of the protective cover 2 and the locking block 203, and the third ring wall 202 completely covers the outer periphery of the second ring wall 103, preventing external dust and liquids from entering the motor through the gap between the second ring wall 103 and the main body of the protective cover 2, ensuring the normal operation of the motor. The cooperation between the first protrusion 104 and the groove 204 prevents the vibration generated by the motor during operation from causing the protective cover 2 to move circumferentially, thereby preventing the protective cover 2 from falling off.

[0040] Preferably, the aforementioned card blocks 203 can be evenly distributed on the third ring wall 202, and the aforementioned notches 105 can be evenly distributed on the second ring wall 103, or they can be partially evenly distributed. However, when they are not evenly distributed, it must be ensured that the protective cover 2 can be fixed on the second ring wall 103. The protective cover 2 should not be subjected to excessive force due to the uneven distribution, so that the protective cover 2 cannot be fixed on the second ring wall 103.

[0041] Preferably, the protective cover 2 is an elastomer, such as... Figure 8 As shown, the first limiting structure is a groove 204, and the second limiting structure is a first protrusion 104, which can be placed inside the groove 204. The surface of the first protrusion 104 has a first mating surface 1041 and a second mating surface 1042. When the locking block 203 passes through the notch 105 and the first protrusion 104 presses against the second annular wall 103, the rotation of the protective cover 2 allows the first protrusion 104 to slide along the first mating surface 1041 into the groove 204. Re-rotating the protective cover 2 in the same direction allows the first protrusion 104 to slide along the second mating surface 1042 out of the groove 204. The first protrusion 104 slides into the groove 204 along the first mating surface 1041. On the one hand, this avoids unnecessary vibration. On the other hand, the deformation of the protective cover 2 caused by the first protrusion 104 entering the groove 204 can have a transition process, thereby avoiding the rapid deformation of the protective cover 2 at the junction of the first protrusion 104 and the second annular wall 103 when the protective cover 2 is drastically deformed. This also prevents the elasticity of the elastomer from weakening and improves the anti-falling performance of the protective cover 2. The first protrusion 104 slides out of the groove 204 along the second mating surface 1042, making the protective cover 2 easier to rotate.

[0042] Preferably, both the first mating surface 1041 and the second mating surface 1042 are planar, and the angle between the first mating surface 1041 and the protective cover body 201 is greater than the angle between the second mating surface 1042 and the protective cover body 201. The first protrusion 104, along the first mating surface 1041, avoids unnecessary vibration and allows the first protrusion 104 to enter the groove 204 more quickly. The protective cover 2 also has a certain rapid deformation before and after the first protrusion 104 enters the groove 204, thus providing feedback to the operator through touch. The first protrusion 104 slides out of the groove 204 along the gentler second mating surface 1042, which can save manpower.

[0043] Preferably, when there are multiple first protrusions 104, the first protrusions 104 can be evenly distributed on the protective cover body in the circumferential direction. Correspondingly, when there are multiple grooves 204, the grooves 204 are evenly distributed in the circumferential direction of the second annular wall 103. The even distribution in the circumferential direction can enable the protective cover 2 to be better positioned on the second annular wall 103.

[0044] Preferred, such as Figure 13 As shown, the distance L1 between adjacent surfaces of the protective cover body 201 and the locking block 203, the thickness H1 of the second annular wall 103, and the height H2 of the first protrusion 104 relative to the second annular wall 103, where H1 < L1 < (H1 + H2), when the first protrusion 104 is placed in the groove 204 and the side of the first connection facing away from the first protrusion 104 is pressed against the side of the locking block 203 facing the first protrusion 104, a portion of the first protrusion 104 is still placed in the groove 204. Without external force, The first protrusion 104 will not slide out of the groove 204, ensuring the protection of the through hole 101 by the protective cover 2; the depth L2 of the groove 204 makes H1 < L1 and (L1+L2) < (H1+H2). When the first protrusion 104 is located in the groove 204, a squeezing force is generated between the first protrusion 104 and the groove 204, and a squeezing force is generated between the second annular wall 103 and the locking block 203; the second annular wall 103 always keeps in contact with the locking block 203, further strengthening the protective function of the protective cover 2.

[0045] Preferred, such as Figure 9 As shown, a handle 3 is formed on the side of the protective cover body 201 facing away from the end cap 1. The handle 3 includes two ends, each pointing to a different groove 204. A positioning structure is formed on the side of the end cap 1 facing the protective cover 2, and the positioning structure corresponds one-to-one with the groove 204. Figure 6-7As shown, the positioning structure includes a second protrusion 4, which is strip-shaped and located around the through hole 101, radially distributed. The second protrusion 4 corresponds one-to-one with the groove 204. The positions of the first protrusion 104 are marked at both ends of the handle 3. When the protective cover 2 covers the second annular wall 103, the position of the groove 204 cannot be observed. The position of the groove 204 can be determined by the second protrusion 4. At the same time, the protective cover 2 can be moved by the handle 3. The second protrusion 4 is provided on the end cap 1. The second protrusion 4 not only strengthens the end cap 1 but also points to the position of the first protrusion 104. When the protective cover 2 covers the second annular wall 103, the first protrusion 104 is not covered. At this time, the position of the first protrusion 104 can be determined by the handle 3. When the protective cover 2 is rotated, the second protrusion 4 is opposite to the handle 3, and the first protrusion 104 is located in the groove 204. In order to better rotate the protective cover 2, as Figure 12 As shown, the outer circular surface of the second annular plate has axial textures, protrusions, or depressions to increase friction.

[0046] When in use, the locking block 203 corresponds to the notch 105, causing the protective cover 2 to move toward the end cap 1. The locking block 203 passes through the notch 105 and causes the first protrusion 104 to press against the second annular wall 103. At this time, the protective cover 2 deforms. By rotating the protective cover 2 through the hand-held part 3 or the outer peripheral surface of the third annular wall 202 on the protective cover 2, the first protrusion 104 slides against the second annular wall 103. The protective cover 2 rotates so that the second annular wall 103 is placed between the locking block 203 and the protective cover body 201. The first protrusion 104 slides into the groove 204 along the first mating surface 1041. The first protrusion 104 presses against the groove 204. At this time, the locking block 203 and the second annular wall 103 are tightly attached together, thus completing the protection of the through hole 101 on the end cap 1.

[0047] When it is necessary to remove the protective cover 2, rotate the protective cover 2 again. The first protrusion 104 slides out of the groove 204 along the second mating surface 1042. Since the included angle between the second mating surface 1042 and the second annular wall 103 is smaller than the included angle between the first mating surface 1041 and the first connection, the first protrusion 104 can slide out of the groove 204 without much effort. After the first protrusion 104 slides out of the groove 204, continue to rotate the protective cover 2. When the locking block 203 moves to the notch 105, move the protective cover 2 away from the end cover 1. The protective cover 2 is then removed from the end cover 1.

[0048] The present invention has the following significant advantages:

[0049] 1. This invention protects the through hole on the motor end cover by extending a first annular wall around the circumference of the through hole on the end cover, and then extending a second annular wall from the first annular wall to the second annular wall, thus protecting the through hole on the motor end cover. A protrusion and a groove are provided between the second annular wall and the main body of the protective cover to prevent the protective cover from falling off due to vibration or other factors during motor operation. A first mating surface and a second mating surface are formed on the first protrusion, wherein the angle between the first mating surface and the second annular wall is greater than the angle between the second mating surface and the second annular wall. When the first protrusion enters the groove along the first mating surface, due to the steepness of the first mating surface, the first protrusion can quickly enter the groove under its own deformation, thus providing a signal and avoiding vibration caused by sudden deformation. Continuing to rotate the protective cover, the first protrusion slides out along the second mating surface. Because the second mating surface is relatively gentle, it allows workers to easily slide the first protrusion out of the groove, facilitating the disassembly of the protective cover and maintenance. The overall structure is simple and ingenious.

[0050] 2. The present invention provides a hand-held block on the protective cover and raised or recessed textures on the outer surface of the second annular plate, which facilitates the rotation of the protective cover so that the two ends on the hand-held block correspond to the first protrusion, and the second protrusion on the end cover corresponds to the first protrusion. On the one hand, when rotating the protective cover, the operator can more intuitively understand the rotation position of the protective cover and thus understand the position where the first protrusion enters the groove; on the other hand, the second protrusion is distributed radially to strengthen the end cover and improve its service life, thereby improving the life of the motor.

[0051] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. An end cap assembly, characterized in that, Includes an end cap and a protective cover disposed on the end cap, wherein, An end cap includes an end cap body, on which a through hole is formed, a first annular wall surrounding the through hole and protruding toward the inner side of the protective cover, and a second annular wall extending from the first annular wall toward the outer side of the first annular wall; a plurality of notches are formed on the outer periphery of the second annular wall, and a first limiting structure is formed on the side of the second annular wall facing the protective cover. The protective cover is an elastic body. The protective cover includes a protective cover body for covering the second annular wall, a third annular wall extending from the protective cover body toward the end cap, and a plurality of locking blocks extending from the third annular wall toward the inner side of the third annular wall. A second limiting structure adapted to the first limiting structure is formed on the side of the protective cover body toward the end cap. Each card block corresponds to one of the notches; When the protective cover is placed on the through hole, the locking block passes through the notch. Rotating the protective cover allows the second ring wall to be placed between the locking block and the main body of the protective cover, and the second limiting structure to cooperate with the first limiting structure. The second ring wall is placed between the main body of the protective cover and the locking block, and the third ring wall completely covers the outer periphery of the second ring wall. The first limiting structure is a groove, and the second limiting structure is a first protrusion. The first protrusion can be placed in the groove. When the first protrusion is located in the groove, a compressive force is generated between the first protrusion and the groove, and a compressive force is generated between the second ring wall and the locking block. The first protruding surface has a first mating surface and a second mating surface, and the top of the first mating surface and the top of the second mating surface are connected by an arc surface; when the card block passes through the notch and the protective cover is rotated, the arc surface moves along the second ring wall and allows the first protrusion to slide into the groove along the first mating surface, and when the protective cover is rotated in the same direction again, the first protrusion can slide out of the groove along the second mating surface. Both the first mating surface and the second mating surface are planes, the main body of the protective cover is a flat plate structure, and the angle between the first mating surface and the main body of the protective cover is greater than the angle between the second mating surface and the main body of the protective cover; The end cap has a positioning structure on the side facing the protective cover, and the positioning structure corresponds one-to-one with the groove; The protective cover body has a hand-held portion formed on the side opposite to the end cap, and the hand-held portion includes an indicator end that points to the first protrusion.

2. An end cap assembly according to claim 1, characterized in that, The positioning structure includes a second protrusion, which is strip-shaped and located around the through hole and is radially distributed. The second protrusion corresponds one-to-one with the groove.

3. An external rotor motor, characterized in that, Includes an end cap assembly according to any one of claims 1-2.

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