End cover, motor shell and motor

Abstract

The utility model relates to an end cover, a motor shell and a motor, and the end cover comprises an end cover body which is made of an aluminum material; the steel sleeve is used for being connected with a rotor of the motor, the steel sleeve is made of steel and is integrally cast and formed on the end cover body, a threaded groove is formed in the outer side of the steel sleeve, the rotation direction of the threaded groove is the same as the forward rotation direction of the rotor, and the threaded groove is concavely formed in the outer side of the steel sleeve; the steel sleeve is further in threaded connection with the end cover body, a limiting ring is further arranged on the outer side of the steel sleeve, and the limiting ring is arranged on the outer side of the steel sleeve in an outward protruding mode. According to the invention, the outer side of the steel sleeve is provided with the concave threaded groove and the convex limiting ring at the same time, so that the influence of circumferential rotation and axial movement of the rotor on the steel sleeve can be reduced at the same time in the operation process of the motor; therefore, the problem that the steel sleeve is easy to loosen and fall off on the end cover body due to the single limiting mode when the steel sleeve is connected with the end cover body is solved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to an end cover, a motor housing and a motor. Background Art

[0002] Dynamic stiffness refers to the ability of a structure to resist deformation under specific dynamic excitation. It can be used to describe vibration reduction performance and measure the ability of a structure to resist predetermined dynamic excitation. Dynamic stiffness is the ratio of dynamic load to displacement, which changes with the excitation frequency. When the excitation frequency is much greater than the natural frequency, the dynamic stiffness is large and the ability to resist deformation is strong; when the excitation frequency is close to the natural frequency, the dynamic stiffness is small, resonance may occur, and deformation is large.

[0003] In the field of motors, since the end cover is usually a cast aluminum part, its structural strength is relatively low. When the thickness of the end cover is insufficient, the end cover has the problem of reduced dynamic stiffness due to the poor NVH performance of the motor. Based on this, the prior art usually sets a steel sleeve on the end cover body of the cast aluminum part to enhance the dynamic stiffness of the end cover. However, in the prior art, the steel sleeve is either threadedly connected to the end cover body or integrally cast in the end cover body. The limiting method when the steel sleeve is connected to the end cover body is single, and the steel sleeve may loosen or fall off on the end cover body. Utility Model Content

[0004] Based on this, the present application provides an end cover, a motor housing and a motor to improve the problem of a single limiting method when the steel sleeve and the end cover body are connected in the prior art.

[0005] In a first aspect, the present application provides an end cap, the end cap comprising:

[0006] The end cover body is made of aluminum;

[0007] A steel sleeve is used to connect with the rotor of the motor. The steel sleeve is made of steel and is integrally cast on the end cover body. A thread groove is arranged on the outer side of the steel sleeve. The direction of rotation of the thread groove is the same as the direction of positive rotation of the rotor, and the inner concave part is arranged on the outer side of the steel sleeve. The steel sleeve is also threadedly connected with the end cover body. A limiting ring is also arranged on the outer side of the steel sleeve. The limiting ring is convexly arranged on the outer side of the steel sleeve.

[0008] In one of the embodiments, the limiting ring and the steel sleeve are integrally formed.

[0009] In one of the embodiments, the limiting ring is arranged at the bottom of the steel sleeve, and the thread groove is arranged at the middle and top of the steel sleeve.

[0010] In one of the embodiments, a bearing chamber is further provided in the steel sleeve, a rotor bearing is interference-fitted in the bearing chamber, and the rotor bearing is used to be sleeved on the rotor.

[0011] In one of the embodiments, a gasket is further provided in the bearing chamber, the gasket is elastically provided along the axial direction of the bearing chamber, the gasket is provided at the bottom of the bearing chamber, and the rotor bearing abuts against the gasket.

[0012] In one embodiment, the thread groove is a triangular thread, a trapezoidal thread, a rectangular thread, a serrated thread or a circular arc thread.

[0013] In one embodiment, the steel sleeve is made of 304 stainless steel.

[0014] In one embodiment, the steel sleeve is made of 45 steel.

[0015] In a second aspect, the present application provides a motor housing, wherein the motor housing comprises any end cover provided in the present application.

[0016] In a third aspect, the present application provides a motor, comprising any motor housing provided in the present application.

[0017] The present application simultaneously provides an inwardly concave thread groove and an outwardly convex limiting ring on the outer side of the steel sleeve, so as to reduce the influence of the circumferential rotation and axial movement of the rotor on the steel sleeve during the operation of the motor, thereby improving the problem that the steel sleeve is easily loosened or falls off on the end cover body due to the single limiting method when connecting the steel sleeve to the end cover body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of the end cover provided in Example 1 of the present application;

[0019] Figure 2 A longitudinal cross-sectional view of the end cover provided in Example 1 of the present application.

[0020] Figure numerals: 100, end cover body; 200, steel sleeve; 210, thread groove; 220, limit ring; 230, bearing chamber; 300, rotor bearing; 400, gasket. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0023] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0024] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] Embodiment 1

[0026] Embodiment 1 of the present application provides an end cap, such as Figure 1 and Figure 2 As shown, the end cap comprises:

[0027] The end cover body 100 is made of aluminum;

[0028] The steel sleeve 200 is used to connect with the rotor of the motor. The steel sleeve 200 is made of steel and is integrally cast on the end cover body 100. A thread groove 210 is arranged on the outer side of the steel sleeve 200. The rotation direction of the thread groove 210 is the same as the positive rotation direction of the rotor, and the thread groove 210 is arranged concavely on the outer side of the steel sleeve 200. The steel sleeve 200 is also threadedly connected with the end cover body 100. A limit ring 220 is also arranged on the outer side of the steel sleeve 200. The limit ring 220 is convexly arranged on the outer side of the steel sleeve 200.

[0029] like Figure 1As shown, in this embodiment, it is exemplarily explained that the motor may include a motor housing and a rotor, and the rotor is rotatably arranged in the motor housing. The motor housing may include an intermediate housing and an end cover, and the intermediate housing and the end cover may both be made of aluminum to achieve a lightweight design of the motor. The intermediate housing may be set as a hollow cylindrical housing, and the end cover may be set as two, and respectively arranged at the two ends of the intermediate housing, and the two ends of the rotor pass through the two end covers respectively. The two end covers may be a front end cover and a rear end cover, respectively, and any one of the front end cover and the rear end cover may be integrally formed with the intermediate housing. The end cover in this embodiment may also be any one of the front end cover and the rear end cover. Limited by factors such as the motor layout space, the thickness of the end cover may be relatively thin, and the cast aluminum material determines its lack of structural strength. By integrally casting the steel sleeve 200 on the end cover body 100, the above-mentioned problems can be well solved.

[0030] In this embodiment, the end cover body 100 is the main functional component of the end cover, which can be set as a cast aluminum part, that is, the end cover body 100 is made of aluminum alloy and is cast. The steel sleeve 200 is made of steel, which is pre-fixed in the casting mold of the end cover body 100 before the end cover body 100 is cast, and then cast integrally with the end cover body 100. The steel sleeve 200 is set as a hollow rotating body structure, and when the rotor is assembled on the end cover, the rotor passes through the inside of the steel sleeve 200. When the motor is running and the NVH performance is poor, since the component connecting the end cover and the rotor is the steel sleeve 200, it has a relatively high structural strength, thereby avoiding the problem that the dynamic stiffness of the end cover is reduced due to the cross-influence of the motor NVH performance.

[0031] like Figure 1 and Figure 2 As shown, in this embodiment, a thread groove 210 is provided on the outer side of the steel sleeve 200, and the thread groove 210 can be prepared by machining the outer side of the steel sleeve 200, so that the thread groove 210 is concave on the outer side of the steel sleeve 200. When the end cover body 100 is cast, a threaded portion corresponding to the thread groove 210 is formed at the position where the end cover body 100 contacts the outer side of the steel sleeve 200, and the threaded portion is tightly matched with the thread groove 210, so that the end cover body 100 and the steel sleeve 200 are threadedly connected. When the rotor rotates forward, the steel sleeve 200 is subjected to circumferential force due to the friction between the rotor and the steel sleeve 200, and in this embodiment, the rotation direction of the thread groove 210 is set to the direction of the forward rotation of the rotor, so the forward rotation of the rotor can make the connection between the steel sleeve 200 and the end cover body 100 more tight and stable, thereby preventing the steel sleeve 200 from being loosened due to the influence of the rotation of the rotor for a long time.

[0032] like Figure 1 and Figure 2As shown, in more detail, a limiting ring 220 is also provided on the outer side of the steel sleeve 200. The limiting ring 220 can be set as a circular ring, and its cross section in the extension direction can be set as a rectangle. The outer diameter of the limiting ring 220 is larger than the outer diameter of the steel sleeve 200, so that the limiting ring 220 protrudes outward from the outer side of the steel sleeve 200. When the end cover body 100 is cast, the position where the end cover body 100 contacts the outer side of the steel sleeve 200 is also formed with a ring groove corresponding to the limiting ring 220, and the ring groove is tightly matched with the limiting ring 220. When the rotor moves axially, the steel sleeve 200 has a tendency to fall off from the end cover body 100 due to the friction between the rotor and the steel sleeve 200. In this embodiment, by setting the limiting ring 220, the limiting ring 220 can limit the steel sleeve 200 axially, thereby preventing the steel sleeve 200 from falling off due to the influence of the axial movement of the rotor for a long time.

[0033] In summary, the present application can reduce the influence of the circumferential rotation and axial movement of the rotor on the steel sleeve 200 during the operation of the motor by simultaneously arranging an inwardly concave thread groove 210 and an outwardly convex limiting ring 220 on the outer side of the steel sleeve 200, thereby improving the problem that the steel sleeve 200 is easily loosened or falls off on the end cover body 100 due to the single limiting method when being connected to the end cover body 100.

[0034] Specifically, the limiting ring 220 and the steel sleeve 200 are integrally formed.

[0035] like Figure 1 and Figure 2 As shown, in this embodiment, it is exemplified that the limit ring 220 and the steel sleeve 200 can be made of the same material, that is, steel. In the preparation process of the steel sleeve 200, the limit ring 220 can be integrally prepared and formed with the steel sleeve 200. It is not difficult to see that in this embodiment, the limit ring 220 is set to steel, which can ensure the structural strength of the limit ring 220, so that the limit ring 220 is not easily deformed due to force when preventing the steel sleeve 200 from falling off. The one-piece preparation method can simplify the preparation process of the limit ring 220 and facilitate the preparation of the limit ring 220.

[0036] More specifically, the limiting ring 220 is disposed at the bottom of the steel sleeve 200 , and the thread groove 210 is disposed at the middle and top of the steel sleeve 200 .

[0037] like Figure 1 and Figure 2As shown, in this embodiment, the stop ring 220 can be integrally formed and arranged at the bottom of the steel sleeve 200, and the thread groove 210 can be machined at the position above the stop ring 220, that is, the middle and top of the steel sleeve 200. In the preparation process of the steel sleeve 200, after the stop ring 220 is integrally formed with the steel sleeve 200, the outer side of the steel sleeve 200 can be machined; when machining, only one machining is required.

[0038] In some embodiments, the limiting ring 220 may be disposed in the middle of the steel sleeve 200, and the thread groove 210 may be disposed on both sides of the limiting ring 220, that is, disposed on the top and bottom of the steel sleeve 200. In this case, machining is required to be performed twice.

[0039] It is understandable that, by reasonably setting the positions of the limit ring 220 and the thread groove 210 on the outer side of the steel sleeve 200 , this embodiment can reduce the number of times the outer side of the steel sleeve 200 is machined, thereby improving the preparation efficiency of the steel sleeve 200 .

[0040] Specifically, a bearing chamber 230 is further provided in the steel sleeve 200 , and a rotor bearing 300 is interference-fitted in the bearing chamber 230 . The rotor bearing 300 is used to be sleeved on the rotor.

[0041] like Figure 1 and Figure 2 As shown, in this embodiment, the bearing chamber 230 can be set as a circular countersunk hole, and the circular countersunk hole part constitutes the hollow interior of the steel sleeve 200. The top of the bearing chamber 230 can be the inner side of the end cover, which is used to arrange the rotor bearing 300. The rotor bearing 300 can be assembled in the bearing chamber 230 in an interference fit manner so that the rotor bearing 300 is installed firmly. When the rotor passes through the steel sleeve 200, it passes through the bearing chamber 230, and the rotor bearing 300 is sleeved on the end of the rotor.

[0042] It can be understood that, in this embodiment, by providing a bearing chamber 230 and providing a rotor bearing 300 for sleeved on the rotor in the bearing chamber 230, not only can the resistance of the rotor be reduced during the circumferential rotation of the rotor so that the rotor rotates smoothly, but also the force on the steel sleeve 200 caused by the circumferential rotation of the rotor can be reduced to reduce the possibility of shaking of the steel sleeve 200.

[0043] More specifically, a gasket 400 is further disposed in the bearing chamber 230 . The gasket 400 is elastically disposed along the axial direction of the bearing chamber 230 . The gasket 400 is disposed at the bottom of the bearing chamber 230 , and the rotor bearing 300 abuts against the gasket 400 .

[0044] like Figure 1 and Figure 2As shown, in this embodiment, by way of example, the gasket 400 can be a corrugated gasket 400, which can be coaxially arranged in the bearing chamber 230. When the rotor passes through the end cover, the gasket 400 is sleeved outside the rotor. The gasket 400 can be elastically arranged in the axial direction to provide a buffering force. When the rotor bearing 300 is arranged in the bearing chamber 230, it abuts against the gasket 400, that is, the gasket 400 is arranged between the bottom of the bearing chamber 230 and the rotor bearing 300. When the rotor moves axially, the gasket 400 is squeezed by the rotor through the rotor bearing 300. When the gasket 400 is compressed, the gasket 400 can block and buffer the axial movement of the rotor.

[0045] It is understandable that, in this embodiment, by disposing the gasket 400 in the bearing chamber 230 , the axial movement of the rotor can be reduced, thereby reducing the possibility of the steel sleeve 200 falling off the end cover body 100 due to the axial movement of the rotor.

[0046] Specifically, the thread groove 210 is a triangular thread, a trapezoidal thread, a rectangular thread, a sawtooth thread or an arc thread.

[0047] like Figure 1 and Figure 2 As shown, in this embodiment, the thread groove 210 can be prepared by machining the outer side of the steel sleeve 200; and when machining, the thread can be preferably one of a triangular thread, a trapezoidal thread, a rectangular thread, a sawtooth thread or an arc thread. The aforementioned thread types have a lower processing difficulty, but are sufficient to meet the need of the limit ring 220 to prevent the steel sleeve 200 from falling off the end cover body 100.

[0048] Specifically, the steel sleeve 200 is made of 304 stainless steel.

[0049] like Figure 1 and Figure 2 As shown, in this embodiment, the material of the steel sleeve 200 can be 304 stainless steel, which can ensure that the steel sleeve 200 will not rust or have pores after long-term use, thereby ensuring that the dynamic stiffness of the end cover will not decrease with the extension of the use time.

[0050] In some embodiments, the steel sleeve 200 may also be made of 45 steel. In this case, although the risk of rusting of the steel sleeve 200 increases, the cost and processing difficulty can be reduced.

[0051] The implementation principle of an end cap provided in the first embodiment of the present application is:

[0052] During the preparation process, the steel sleeve 200 is prepared by using steel. When preparing the steel sleeve 200, the limit ring 220 is formed integrally with the steel sleeve 200. Subsequently, the thread groove 210 is processed on the outer side of the steel sleeve 200. Then the steel sleeve 200 is pre-fixed in the casting mold of the end cover body 100, and then the steel sleeve 200 is integrally cast with the end cover body 100. When the end cover body 100 is cast, the position where the end cover body 100 contacts the outer side of the steel sleeve 200 is formed with a threaded portion corresponding to the thread groove 210, and the threaded portion is tightly matched with the thread groove 210, so that the end cover body 100 is threadedly connected with the steel sleeve 200. The position where the end cover body 100 contacts the outer side of the steel sleeve 200 is also formed with a ring groove corresponding to the limit ring 220, and the ring groove is tightly matched with the limit ring 220.

[0053] The present application simultaneously provides an inwardly concave thread groove 210 and an outwardly convex limiting ring 220 on the outer side of the steel sleeve 200, so as to reduce the influence of the circumferential rotation and axial movement of the rotor on the steel sleeve 200 during the operation of the motor, thereby improving the problem that the steel sleeve 200 is easily loosened or falls off on the end cover body 100 due to the single limiting method when being connected to the end cover body 100.

[0054] Embodiment 2

[0055] Embodiment 2 of the present application provides a motor housing, and the motor housing includes any end cover provided in the present application.

[0056] In this embodiment, the motor housing may include an intermediate housing and an end cover, and the intermediate housing and the end cover may both be made of aluminum to achieve a lightweight design of the motor. The intermediate housing may be a hollow cylindrical housing, and two end covers may be provided, and are respectively provided at both ends of the intermediate housing. The two end covers may be a front end cover and a rear end cover, respectively, and any one of the front end cover and the rear end cover may be integrally formed with the intermediate housing. The end cover in this embodiment may also be any one of the front end cover and the rear end cover.

[0057] Embodiment 3

[0058] Embodiment 3 of the present application provides a motor, characterized in that the motor comprises any motor housing provided in the present application.

[0059] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. An end cap, characterized in that: The end cap comprises: The end cover body (100) is made of aluminum; A steel sleeve (200) is used to connect with the rotor of the motor. The steel sleeve (200) is made of steel and is integrally cast on the end cover body (100). A thread groove (210) is arranged on the outer side of the steel sleeve (200). The rotation direction of the thread groove (210) is the same as the positive rotation direction of the rotor and is concavely arranged on the outer side of the steel sleeve (200). The steel sleeve (200) is also threadedly connected to the end cover body (100). A limit ring (220) is also arranged on the outer side of the steel sleeve (200). The limit ring (220) is convexly arranged on the outer side of the steel sleeve (200).

2. The end cap according to claim 1, characterized in that: The limiting ring (220) and the steel sleeve (200) are integrally formed.

3. The end cap according to claim 2, characterized in that: The limiting ring (220) is arranged at the bottom of the steel sleeve (200), and the thread groove (210) is arranged at the middle and top of the steel sleeve (200).

4. The end cap according to claim 1, characterized in that: A bearing chamber (230) is also provided in the steel sleeve (200), and a rotor bearing (300) is interference-fitted in the bearing chamber (230), and the rotor bearing (300) is used to be sleeved on the rotor.

5. The end cap according to claim 4, characterized in that: A gasket (400) is also provided in the bearing chamber (230). The gasket (400) is elastically provided along the axial direction of the bearing chamber (230). The gasket (400) is provided at the bottom of the bearing chamber (230), and the rotor bearing (300) abuts against the gasket (400).

6. The end cap according to claim 1, characterized in that: The thread groove (210) is a triangular thread, a trapezoidal thread, a rectangular thread, a sawtooth thread or a circular arc thread.

7. The end cap according to claim 1, characterized in that: The steel sleeve (200) is made of 304 stainless steel.

8. The end cap according to claim 1, characterized in that: The steel sleeve (200) is made of 45 steel.

9. A motor housing, characterized in that: The motor housing comprises the end cover according to any one of claims 1 to 8.

10. A motor, characterized in that: The electric motor comprises the motor housing according to claim 9.

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