Motor front end cover and motor

Abstract

The application provides a motor front end cover and a motor, and belongs to the motor field. The motor front end cover comprises a front end cover body, a bearing chamber is arranged in the front end cover body, a bearing ring is arranged in the bearing chamber and is integrally formed with the front end cover body by pressure casting, a limiting groove is arranged on the outer circumferential surface of the bearing ring along the circumferential direction of the bearing ring, and the limiting groove is configured to prevent the front end cover body from moving axially and radially relative to the bearing ring. By arranging the limiting groove on the outer circumferential surface of the bearing ring, the relative stability between the front end cover body and the bearing ring can be ensured when the front end cover body is pressure cast, and the relative stability between the front end cover body and the bearing ring after pressure casting can also be ensured, so that the motor can effectively prevent the bearing chamber from creeping when the motor is running.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of electric machines, and particularly relates to an electric machine front end cover and an electric machine. BACKGROUND

[0002] In recent years, with the continuous development of industrial robots, electronic manufacturing equipment and other industries, the market scale of servo motors keeps a sustained growth trend, and the application fields are also more and more widely. The servo motor front end cover is generally made of aluminum alloy, and the hardness of aluminum alloy is low, while the bearing is generally made of bearing steel, and the hardness of bearing steel is large. Since the movement track of the shaft of the motor is not a standard circle when the motor is running, but an ellipse, the bearing load is heavy, and the hardness of the bearing chamber is relatively soft, which causes the front end cover bearing chamber to creep, so the front end cover of the servo motor with large output load is generally designed with a bearing ring to prevent the bearing chamber from creeping.

[0003] The bearing ring generally needs to be axially and circumferentially fixed without movement before and after the die-cast aluminum end cover, so the outer periphery of the traditional bearing ring generally has a circumferential groove, a through hole and an axial equal groove to ensure the positioning accuracy and stability of the cooperation of the die-cast front end cover before and after, the bearing ring and the front end cover. The traditional bearing ring not only has a complex structure, but also has a complicated processing process, resulting in high production cost.

[0004] Therefore, the present application is proposed. SUMMARY

[0005] The present application overcomes the shortcomings of the prior art and provides an electric machine front end cover and an electric machine.

[0006] To solve the above technical problems, on the one hand, the present application provides an electric machine front end cover, which comprises a front end cover body, and the front end cover body has a bearing chamber therein;

[0007] A bearing ring integrally formed with the front end cover body by die casting is arranged in the bearing chamber, and a limiting groove is formed on the outer circumferential surface of the bearing ring along the circumferential direction thereof.

[0008] The limiting groove is configured to prevent the front end cover body from axially and radially moving relative to the bearing ring during and after die casting.

[0009] In the above technical solution, the front end cover body and the bearing ring are integrally formed by die casting when the front end cover body is die cast.

[0010] In the above technical solution, the limiting groove comprises a spiral groove extending on the outer circumferential surface of the bearing ring.

[0011] In the above technical solution, the bearing ring has a bottom end and a top end, and the limiting groove is composed of a plurality of spiral groove segments extending along the outer circumferential surface of the bearing ring and turning between the bottom end and the top end of the bearing ring.

[0012] In the technical solution, the plurality of spiral groove segments are connected at their ends to form a closed groove.

[0013] In the technical solution, the spiral groove segment has a starting end and a terminal end, and the groove width and the groove depth of the spiral groove segment are the same from the starting end to the terminal end.

[0014] In the technical solution, the limiting grooves have two groups, one group of the limiting grooves is extended and formed on the outer circumferential surface of the bearing ring with the bottom end of the bearing ring as the starting point, and the other group of the limiting grooves is extended and formed on the outer circumferential surface of the bearing ring with the top end of the bearing ring as the starting point.

[0015] The two groups of the limiting grooves intersect on the outer circumferential surface of the bearing ring to make the two groups of the limiting grooves communicate with each other.

[0016] In the technical solution, the two groups of the limiting grooves are symmetrically arranged with the center surface of the outer circumferential surface of the bearing ring as the symmetric surface, and the intersection points of the two groups of the limiting grooves are located at the center of the outer circumferential surface of the bearing ring when the two groups of the limiting grooves are symmetrically arranged.

[0017] In the technical solution, the front end cover body is made of aluminum, and the bearing ring is made of steel.

[0018] On the other hand, the embodiment of the present application also provides an electric machine, which comprises a machine shell, a rear end cover and the above-mentioned front end cover.

[0019] On the other hand, the embodiment of the present application also provides an industrial robot, which is provided with the above-mentioned electric machine.

[0020] Compared with the prior art, the technical solution has the following beneficial effects:

[0021] Firstly, the present application sets the limiting grooves on the outer circumferential surface of the bearing ring, which not only ensures the relative stability between the front end cover body and the bearing ring before the front end cover body is pressure-cast, but also ensures the relative stability between the front end cover body and the bearing ring after the front end cover body is pressure-cast, so that the electric machine can effectively prevent the bearing chamber from creeping when the electric machine is running.

[0022] Secondly, the bearing ring of the present application saves the material for positioning part of the traditional bearing ring, so that the position of the wave-shaped elastic gasket in the bearing chamber of the front end cover and the position of the front bearing are closer to the shaft extension end of the electric machine, and the space of the front end cover is better utilized. Moreover, since the bearing saves the material for the positioning part, the processing technology is simplified, resources are saved, and the production cost of the electric machine is reduced.

[0023] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the application and together with the description, serve to explain the application. Obviously, the drawings described below are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings. In the drawings:

[0025] Figure 1 It is a schematic diagram of the overall structure of the motor in the prior art;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the bearing ring in the prior art;

[0027] Figure 3 It is a schematic diagram of the left view structure of the bearing ring in the prior art;

[0028] Figure 4 It is a schematic diagram of the front view structure of the bearing ring in the embodiment of the motor front end cover of the application;

[0029] Figure 5 It is a schematic diagram of the left view structure of the bearing ring in the embodiment of the motor front end cover of the application;

[0030] Figure 6 It is a schematic diagram of the plane structure of the bearing ring in the embodiment of the motor front end cover of the application after being unfolded in the circumferential direction, and the arrow in the figure shows the opening path of the limiting groove on the outer peripheral surface of the bearing ring;

[0031] Figure 7 It is a schematic diagram of the three-dimensional structure of the bearing ring in the embodiment of the motor front end cover of the application;

[0032] Figure 8 It is a schematic diagram of the overall structure of the motor embodiment of the application;

[0033] Figures 1-3 In the figure: 1'-front end cover, 2'-bearing ring, 3'-machine shell, 4'-rear end cover.

[0034] Figures 4-8 In the figure: 1-front end cover body, 2-bearing ring, 21-limiting groove, 211-spiral groove section, 22-bottom end, 23-top end, 3-machine shell, 4-rear end cover.

[0035] It should be noted that these drawings and written descriptions are not intended to limit the scope of the concept of the application in any way, but to illustrate the concept of the application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0036] In the description of the present application, it should be noted that the terms "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0037] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "contact", "communication" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] The existing bearing ring not only has a complex structure, but also has a complicated processing process, resulting in high production cost. The bearing ring structure in the bearing chamber of the front end cover is designed, and the bearing ring with a limiting groove on the outer circumference is adopted. The groove can ensure that the front end cover is not moved axially and radially relative to the bearing ring before and after the front end cover is pressure cast, and the material of the traditional bearing chamber bearing ring positioning part is saved, which not only simplifies the traditional bearing ring structure, but also saves resources.

[0039] In order to further illustrate the technical solutions in the present application, the following specific embodiments are provided in combination with the drawings. Figures 1-8

[0040] Before the embodiments of the present application are described, the bearing ring 2' in the existing motor is described.

[0041] As shown in Figures 1-3 The motor includes a shell 3' and front and rear end covers 1' and 4' installed at both ends of the shell 3', and further includes a bearing ring 2' installed in the front end cover 1'. When the bearing ring 2' is placed in the front end cover body 1', the bearing ring 2' is provided with a circumferential groove, a through hole and an axial equal groove on the outer circumference to ensure the stability and positioning accuracy of the bearing ring 2 and the front end cover during pressure casting of the front end cover, thereby resulting in a complex structure of the bearing ring and a complicated processing process, resulting in high production cost.

[0042] In order to solve the problems in the prior art, the present application provides a kind of as Figures 4-7 ​The shown motor front end cover comprises a front end cover body 1, the front end cover body 1 is internally provided with a bearing chamber, and a bearing ring 2 is arranged in the bearing chamber and is integrally formed with the front end cover body 1 by pressure casting, wherein the inner diameter, the outer diameter and the height of the bearing ring 2 are set according to the size of the front end cover body 1, and a limiting groove 21 is formed on the outer circumferential surface of the bearing ring 2 along the circumferential direction thereof, wherein the limiting groove 21 is configured to prevent the front end cover body 1 from axially and radially moving relative to the bearing ring 2 during and after the pressure casting.

[0043] Specifically, the limiting groove 21 on the outer circumferential surface of the bearing ring 2 increases the friction between the bearing ring 2 and the mold during the pressure casting, and the friction is divided into axial force and tangential force.

[0044] When the front end cover body 1 is pressure cast, the front end cover body 1 is integrally formed with the bearing ring 2 by pressure casting, at this time, the limiting groove 21 on the bearing ring 2 ensures the accurate positioning of the bearing ring 2 when the front end cover body 1 is pressure cast, controls the axial and radial displacement of the front end cover body 1 relative to the bearing ring 2, and further fixes the front end cover body 1 relative to the bearing ring 2 without moving, so that the material of the traditional bearing ring 2 for the positioning part can be saved.

[0045] It is worth noting that the above-mentioned front end cover body 1 is made of aluminum material, and the bearing ring 2 is made of steel material. When the front end cover body 1 is pressure cast, the aluminum alloy liquid is poured into the mold to be cooled and formed, and the specific pressure casting steps are as follows:

[0046] Before pouring the aluminum alloy liquid into the mold, the bearing ring 2 is placed in the mold, and then the aluminum alloy liquid is poured on the bearing ring 2 to be cooled and formed. Since the limiting groove 21 is arranged on the outer circumferential surface of the bearing ring 2, the aluminum alloy liquid can be injected into the limiting groove 21 and tightly combined with the front end cover body 1 and the bearing ring 2, so as to ensure that the front end cover body 1 after pressure casting is axially and circumferentially fixed relative to the bearing ring 2 without moving. Due to the tight combination of the front end cover body 1 and the bearing ring 2, when the motor is running, whether the motor shaft applies an axial force or a radial force, the position of the bearing ring 2 relative to the front end cover body 1 remains unchanged, thereby achieving the effect of preventing the bearing chamber of the front end cover body 1 from creeping.

[0047] In summary, by arranging the limiting groove 21 on the outer circumferential surface of the bearing ring 2, the relative stability between the front end cover body 1 and the bearing ring 2 during the pressure casting of the front end cover body 1 can be ensured, and the relative stability between the front end cover body 1 and the bearing ring 2 after the pressure casting can also be ensured.

[0048] The limiting groove 21 on the outer circumferential surface of the bearing ring 2 will be described in detail as follows:

[0049] As Figure 6 and Figure 7As shown in the drawings, the limiting groove 21 comprises a spiral groove extending on the outer circumferential surface of the bearing ring 2. By setting the limiting groove 21 in a spiral shape, the friction between the bearing ring 2 and the mold can be further increased, thereby avoiding the bearing ring 2 from moving during die casting. In the process of machining the spiral groove, a three-dimensional drawing is drawn according to the drawing of the bearing ring with groove, and is imported into the machining equipment to realize the machining of the spiral groove.

[0050] Further, as shown in the drawings, Figure 6 The bearing ring 2 has a bottom end 22 and a top end 23 in the axial direction. The limiting groove 21 is composed of a plurality of spiral groove segments 211 extending along the outer circumferential surface of the bearing ring 2 and turning back between the bottom end 22 and the top end 23 of the bearing ring 2. The plurality of spiral groove segments 211 are connected to each other to form a closed groove.

[0051] In addition, the spiral groove segment 211 has a starting end and a terminal end. In order to keep the joint strength of the bearing ring 2 and the front end cover body 1 the same after being joined, in the embodiment, the groove width of the spiral groove segment 211 from the starting end to the terminal end is kept the same, and the groove depth of the spiral groove segment 211 from the starting end to the terminal end is also kept the same, thereby ensuring that the joint strength at different joint positions is kept the same.

[0052] Further, as shown in the drawings, Figure 6 The limiting groove 21 has two groups. One group of limiting grooves 21 extends on the outer circumferential surface of the bearing ring 2 with the bottom end 22 of the bearing ring 2 as the starting point. The other group of limiting grooves 21 extends on the outer circumferential surface of the bearing ring 2 with the top end 23 of the bearing ring 2 as the starting point. The two groups of limiting grooves 21 intersect on the outer circumferential surface of the bearing ring 2 to make the two groups of limiting grooves 21 communicate with each other. By setting the two groups of limiting grooves 21, the joint positions between the bearing ring 2 and the front end cover body 1 can be further increased, thereby further increasing the joint strength between the bearing ring 2 and the front end cover body 1.

[0053] Specifically, the two groups of limiting grooves 21 are symmetrically arranged with the center surface of the outer circumferential surface of the bearing ring 2 as the symmetry plane. When the two groups of limiting grooves 21 are symmetrically arranged, the intersection point is located at the center position of the outer circumferential surface of the bearing ring 2. By setting the two groups of symmetric limiting grooves 21, the joint positions between the bearing ring 2 and the front end cover body 1 can be increased while the joint positions between the bearing ring 2 and the front end cover body 1 are uniformly distributed. Since the center position of the outer circumferential surface of the bearing ring 2 is subjected to the largest force when the motor shaft rotates, by setting the intersection point of the two groups of limiting grooves 21 at the center position of the outer circumferential surface of the bearing ring 2, the most aluminum alloy liquid can be ensured at this intersection position during die casting, thereby improving the strength of the center position of the outer circumferential surface.

[0054] On the other hand, as shown in the drawings, Figure 8As shown, the embodiment of the present application further provides an electric machine, which comprises the shell 3, the rear end cover 4 and the front end cover mentioned above, preferably, the electric machine is a 180 caliber high-power servo motor.

[0055] Still another application, the embodiment of the present application further provides an industrial robot, which is provided with the electric machine mentioned above.

[0056] The embodiment of the present application has the following effects:

[0057] In the embodiment of the present application, the limiting groove 21 is arranged on the outer circumferential surface of the bearing ring 2, which not only ensures the relative stability between the front end cover body 1 and the bearing ring 2 when the front end cover body 1 is pressure-cast, but also ensures the relative stability between the front end cover body 1 and the bearing ring 2 after the pressure-casting, effectively preventing the bearing chamber from creeping when the electric machine is running. Moreover, since the bearing ring 2 omits the material for positioning part of the traditional bearing ring 2, the position of the wave-shaped elastic gasket and the front bearing placed in the bearing chamber of the front end cover is closer to the shaft extension end of the electric machine, which better utilizes the space of the front end cover. According to the calculation, the structure of the bearing ring 2 saves 38% of the raw materials compared with the traditional bearing ring structure, simplifies the processing technology, saves resources and reduces the production cost of the electric machine.

[0058] The above description is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above-mentioned technical content without departing from the technical solution of the present application, and any simple modification, equivalent change and modification of the above-mentioned embodiment based on the technical essence of the present application still belongs to the scope of the present application.

Claims

1. An electric machine front end cover, characterized in that, The front end cover body (1) has a bearing chamber inside; The bearing chamber is provided with a bearing ring (2) integrally formed with the front end cover body (1) by die casting, and a limiting groove (21) is formed on the outer circumferential surface of the bearing ring (2) along the circumference thereof; The limiting groove (21) is configured to prevent the front end cover body (1) from axially and radially moving relative to the bearing ring (2) during and after die casting; The limiting groove (21) comprises a spiral groove formed on the outer circumferential surface of the bearing ring (2); The bearing ring (2) has a bottom end (22) and a top end (23), and the limiting groove (21) is composed of a plurality of spiral groove segments (211) extending along the outer circumferential surface of the bearing ring (2) and turning back between the bottom end (22) and the top end (23) of the bearing ring (2); The plurality of spiral groove segments (211) are connected to each other to form a closed groove.

2. The motor front end cover of claim 1, wherein The front end cover body (1) and the bearing ring (2) are integrally formed by die casting.

3. The motor front end cover of claim 1, wherein The spiral groove segment (211) has a starting end and a terminating end, and the groove width and the groove depth of the spiral groove segment (211) are the same from the starting end to the terminating end.

4. The motor front end cover of claim 3, wherein The limiting groove (21) has two groups, one group of the limiting groove (21) is formed on the outer circumferential surface of the bearing ring (2) with the bottom end (22) of the bearing ring (2) as the starting point, and the other group of the limiting groove (21) is formed on the outer circumferential surface of the bearing ring (2) with the top end (23) of the bearing ring (2) as the starting point. The two groups of limiting grooves (21) intersect on the outer circumferential surface of the bearing ring (2) to make the two groups of limiting grooves (21) communicate with each other.

5. The motor front end cover of claim 4, wherein, The two groups of limiting grooves (21) are symmetrically arranged with the center surface of the outer circumferential surface of the bearing ring (2) as the symmetry surface, and the intersection points of the two groups of limiting grooves (21) are located at the center of the outer circumferential surface of the bearing ring (2) when the two groups of limiting grooves (21) are symmetrically arranged.

6. The motor front end cover according to any one of claims 1-5, characterized in that The front end cover body (1) is made of aluminum, and the bearing ring (2) is made of steel.

7. An electric machine characterized by The machine shell (3), the rear end cover (4), and the front end cover according to any one of claims 1-6 are provided.

8. An industrial robot, characterized by The motor according to claim 7 is provided.

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