electric machine

Abstract

The present application provides a motor, comprising: a shaft; a bearing supporting the shaft; a shroud comprising a first hole through which the shaft passes; and a base comprising a second hole through which the shaft passes, wherein the shroud comprises a first region disposed in the base, and a second region extending from the first region and protruding outwardly from the base, the shroud has the first hole, and the bearing is disposed in the first hole.

Description

Technical Field

[0001] This invention relates to an electric motor. Background Technology

[0002] Typically, in an electric motor, the rotor rotates due to the electromagnetic interaction between the rotor and the stator. In this case, the shaft connected to the rotor also rotates to generate rotational driving force.

[0003] The rotor and stator are housed within a housing. This housing is a hollow cylindrical structure. One side of the housing is open. A bearing housing covers the open side of the housing. This bearing housing contains the bearing.

[0004] After the bearing is installed in the bearing housing, caulking is performed to secure the bearing to the housing. Similarly, after the shield is installed in the bearing housing, caulking can be performed to secure the shield to the housing. The bearing housing can be formed from aluminum using a die-casting process.

[0005] However, such bearing housing structures present a complex manufacturing process. Summary of the Invention

[0006] [Technical Issues]

[0007] Therefore, the present invention aims to solve the above-mentioned problems and to provide an electric motor with a bearing housing having a simple structure and a simple manufacturing process.

[0008] The objectives achieved by this invention are not limited to those described above. Other objectives not described above will be clearly understood by those skilled in the art through the following description.

[0009] [Technical Solution]

[0010] One aspect of the present invention provides an electric motor, comprising: a shaft; a bearing supporting the shaft; a cover including a first hole for the shaft to pass through; and a base including a second hole for the shaft to pass through, wherein the cover includes: a first region disposed in the base; and a second region extending from the first region, projecting outward from the base, and having the first hole, and the bearing being disposed in the first hole.

[0011] Another aspect of the present invention provides an electric motor, comprising: a shaft; a bearing; a support shaft; a shroud in which the bearing is disposed; and a base, wherein at least a portion of the shroud is inserted, the shroud including a flange inserted into the base and a first protrusion projecting from the flange; the bearing including an outer peripheral surface in contact with an inner surface of the first protrusion and a first surface therein in contact with at least a portion of the bearing and the base.

[0012] Another aspect of the present invention provides an electric motor, comprising: a shaft; a bearing; a support shaft; a cover including a first hole in which the bearing is disposed; and a molding member, at least a portion of the cover being molded into the molding member, wherein the molding member includes a third region in contact with a portion of the bearing and a second hole through which the shaft passes, and the diameter of the second hole is smaller than the diameter of the first hole.

[0013] [Beneficial Effects]

[0014] According to one embodiment, it has the advantages of simple base structure and manufacturing process.

[0015] According to one embodiment, since the columnar part of the bearing housing is located inside the sixth hole of the shroud, it has the advantage of high connection force between the shroud and the base.

[0016] According to one embodiment, since the third protrusion of the base guides the busbar, it has the advantages of improving the assemblability of the base and the busbar and making it easy to align with the busbar position.

[0017] According to one embodiment, since the ribs are provided on the outer peripheral surface of the resin-formed base and are press-fitted into the inner peripheral surface of the housing, it has the advantage of omitting the caulking or the separate fastening structure for connecting the base and the housing. Attached Figure Description

[0018] Figure 1 This is a side sectional view of an electric motor according to one embodiment.

[0019] Figure 2 This is a view showing the base on which the bearing is mounted.

[0020] Figure 3 It is shown Figure 2 An exploded view of the base shown.

[0021] Figure 4 This shows the bearing and base along Figure 2 The side sectional view of line AA in the diagram.

[0022] Figure 5 This is a three-dimensional view showing the protective shield.

[0023] Figure 6 This shows the bearing and base along Figure 2 The side sectional view of line BB in the middle.

[0024] Figure 7 This is a side cross-sectional view showing the bearing being press-fitted into the second region of the casing.

[0025] Figure 8 This is a plan view showing the terminal retainer.

[0026] Figure 9 This is a bottom view showing the terminal retainer.

[0027] Figure 10 This is a bottom view showing the base.

[0028] Figure 11 This is a view showing the ribs of the base. Detailed Implementation

[0029] The direction parallel to the longitudinal direction (vertical direction) of the axis is called the axial direction, the direction perpendicular to the axial direction of the axis is called the radial direction, and the direction of a circle with a radius in the radial direction starting from the axis is called the circumferential direction.

[0030] Figure 1 This is a side sectional view of an electric motor according to one embodiment.

[0031] refer to Figure 1 The motor according to this embodiment may include a shaft 100, a rotor 200, a stator 300, a bearing 400, a base 500, a cover 600, a terminal holder 700, a busbar holder 800, a busbar 900, and a housing 1000. In the following text, the term "inward" refers to the direction from the housing 1000 toward the shaft 100, which is the center of the motor, while the term "outward" refers to the opposite direction, i.e., the direction from the shaft 100 toward the housing 1000.

[0032] Shaft 100 can be connected to rotor 200. When current is supplied, electromagnetic interaction occurs between rotor 200 and stator 300, rotor 200 rotates, and shaft 100 rotates together with rotor 200. Shaft 100 can be formed of a hollow component.

[0033] The rotor 200 rotates due to electrical interaction with the stator 300. The rotor 200 can be configured to correspond to the stator 300 and can be disposed inside the stator 300. The rotor 200 may include a rotor core 210 and a magnet 220. The magnet 220 may be attached to the outer surface of the rotor core 210 or contained within the rotor core 210.

[0034] The stator 300 is disposed outside the rotor 200. The stator 300 may include a stator core 310, an insulator 320, and a coil 330. The insulator 320 is disposed on the stator core 310. The coil 330 is mounted on the insulator 320. The coil 330 generates electrical interaction with the magnet 220 of the rotor 200.

[0035] The bearing 400 rotatably supports the shaft 100.

[0036] The base 500 includes the bearing 400. The base 500 covers the open side of the housing 1000.

[0037] The shield 600 is used to prevent magnetic flux lines generated by the magnet 220 of the rotor 200 from passing through the base 500. Both the sensing magnet and the sensor that detects changes in magnetic force caused by the sensing magnet can be positioned outside the base 500. Magnetic flux lines passing through the base 500 may affect the sensor's sensing. The shield 600 blocks the magnetic flux lines, thus preventing them from affecting the sensor.

[0038] Terminal retainer 700 is mounted on base 500 and is used to guide busbar 900 protruding upward from inside base 500.

[0039] Busbar 900 can be disposed on stator 300. Busbar 900 is electrically connected to coil 330. Furthermore, busbar 900 can be a U-phase, V-phase, or W-phase busbar connected to coil 330, or a power supply busbar connected to an external power source. The busbar 900 described below is an embodiment of a power supply busbar.

[0040] Busbar retainer 800 supports busbar 900. Busbar retainer 800 may be an annular member in which busbar 900 is housed.

[0041] The housing 1000 may be disposed outside the stator 300. The housing 1000 may be a cylindrical member with an open side.

[0042] Figure 2 This is a view showing the base on which the bearing is installed. Figure 3 It is shown Figure 2 An exploded view of the base shown.

[0043] refer to Figure 2 and Figure 3 The base 500 and the cover 600 can be integrally molded by insert injection molding. Hereinafter, the base 500 may be referred to as the molding part. Therefore, the manufacturing process can be simplified by omitting the caulking process or using separate fastening components to mount the cover 600 onto the base 500, and by securing the cover 600 during the molding of the base 500.

[0044] After the base 500 and the housing 600 are molded by insert injection molding, the bearing 400 can be fixedly press-fitted into the housing 600. Since the housing 500 is made of resin, it is not suitable to press-fit the bearing 400 into it. Therefore, the motor according to this embodiment is characterized in that: since a portion of the housing 600 exposed from the base 500 is used as the area for fixing the bearing 400, the manufacturing process is simplified by injection molding, and the bearing 400 is also stably fixed.

[0045] Simultaneously, the terminal retainer 700 can be mounted on the base 500. The terminal retainer 700 can be mechanically coupled to the base 500. The protrusion 540 for coupling can be configured to protrude from the base 500. The protrusion 540 can be mechanically coupled to an external device.

[0046] Figure 4 It shows along Figure 2 Side sectional view of the base and bearing of centerline AA. In the following text, one surface of the base 500 is defined as the surface that protrudes from the exterior of the housing 1000 in the axial direction when the base 500 is connected to the housing 1000, while the other surface of the base 500 is defined as the surface that faces the interior of the housing 1000 in the axial direction.

[0047] refer to Figure 4 The base 500 may include a second hole H2 through which the shaft 100 passes. Furthermore, the cover 600 may be divided into a first region 610 (flange) and a second region 620 (first protrusion).

[0048] The first region 610 has an annular plate shape. The first region 610 is disposed in the base 500 and blocks magnetic flux lines generated inside the motor from passing through the base 500.

[0049] The second region 620 may be a cylindrical member that bends and extends from the inside of the first region 610. A first hole H1 is formed in the second region 620. The second region 620 is configured such that the first hole H1 and the second hole H2 are aligned and communicate with each other. The inner diameter D2 of the second hole H2 may be smaller than the inner diameter D1 of the first hole H1. A bearing 400 is fixedly disposed in the first hole H1 of the second region 620. The bearing 400 includes a third hole H3 through which the shaft 100 passes. The diameter D2 of the second hole H2 is larger than the diameter D3 of the third hole H3.

[0050] The inner circumferential surface of the second region 620 contacts the outer circumferential surface of the bearing 400. The bearing 400 is fixed in the second region 620, and the second region 620 also prevents magnetic flux lines generated inside the motor from being emitted outward from the base 500 through the first hole H1 of the bearing 400 and the base 500.

[0051] Figure 5 This is a perspective view showing the protective cover 600.

[0052] refer to Figure 4 and Figure 5The protective cover 600 may include a plurality of fourth holes H4 disposed in the first region 610. Each fourth hole H4 is configured to allow the busbar 900 to pass through it. The three fourth holes H4 for the U-phase busbar, V-phase busbar, and W-phase busbar to pass through can be arranged at regular intervals in the circumferential direction. In the case of a dual-winding type motor, the coils 330 of the stator 300 are electrically isolated. Since a U-phase busbar 900, a V-phase busbar 900, and a W-phase busbar 900 are also provided, two groups are set when three fourth holes H4 are defined as a group, that is, six fourth holes H4 can be provided. Considering the shape of the busbar 900, the fourth hole H4 can have a rectangular shape.

[0053] The base 500 includes a spatial portion S in which a protective cover 600 is disposed. A first region 610 of the protective cover 600 is disposed in this spatial portion S, the first region 610 being disposed within the base 500, and a second region 620 exposing the exterior of the base 500. At least the outer peripheral surface of the second region 620 may be covered by the base 500, and the inner peripheral surface of the second region 620 should be exposed to the outside to contact the bearing 400.

[0054] The base 500 may include a fifth hole H5. Each fifth hole H5 is configured such that the busbar 900 passes through the fifth hole H5 and is disposed inside the fourth hole H4 of the cover 600. The fifth hole H5 overlaps with the fourth hole H4 in the axial direction.

[0055] The fifth hole H5 is located at the same position as the fourth hole H4 of the cover 600. The fifth hole H5 is configured to extend from one surface of the base 500 to another through the space portion S. The busbar 900 can pass through the fifth hole H5 from the interior of the base 500 to the exterior of the base 500.

[0056] Figure 6 The bearing 400 and the base 500 are shown along... Figure 2 Side sectional view of centerline BB.

[0057] refer to Figure 5 and Figure 6 The shield 600 may include multiple sixth holes H6. The sixth holes H6 increase the connection between the shield 600 and the base 500. During insertion molding, resin fills the sixth holes H6 to form columns 510 disposed in the spatial portion S, thus increasing the connection between the shield 600 and the base 500. The sixth holes H6 may be disposed circumferentially between adjacent fourth holes H4. The size of each sixth hole H6 may be smaller than the size of the fourth hole H4. The shape of the sixth hole H6 may be circular.

[0058] Figure 7This is a side cross-sectional view showing the bearing 400 being press-fitted into the second region 620 of the cover 600.

[0059] refer to Figure 4 and Figure 7 The bearing 400 can be press-fitted into the second region 620 of the cover 600. Since the cover 600 is made of metal, the strength used to secure the bearing 400 is ensured. In this case, the axial length L1 of the second region 620 can be greater than the axial length L2 of the bearing 400 to adequately block magnetic flux lines generated from inside the motor and flowing to the bearing 400, and to ensure sufficient caulking area for securing the bearing 400 to the second region 620. Protrusions 601 can be provided on the ends of the second region 620 using a caulking process. Multiple protrusions 601 can be arranged along the circumference of the second region 620.

[0060] In the axial direction, the first surface 401 of the outer wheel of the bearing 400 contacts and is supported by the base 500, and one surface 402 of the outer wheel of the bearing 400 is supported by the protrusion 601, thereby fixing the bearing 400.

[0061] Because the diameter D2 of the second hole H2 in the base 500 is smaller than the diameter of the first hole H1 in the cover 600, a third region T of the base 500, which protrudes further inward than the first hole H1, is formed in the radial direction. During the caulking process, the third region T can be used to support one surface of the outer wheel of the bearing 400. The diameter D2 of the second hole H2 is appropriately defined such that the third region T does not contact the inner wheel of the bearing 400.

[0062] Figure 8 This is a plan view showing the terminal holder 700, and Figure 9 This is a bottom view showing the terminal retainer 700.

[0063] refer to Figure 8 and Figure 9 The terminal retainer 700 is used to guide the busbar 900 protruding upward from the interior of the base 500. Furthermore, the terminal retainer 700 covers the fifth hole H5 of the base 500 to prevent water or impurities from entering the interior of the housing 1000 through the fifth hole H5. The terminal retainer 700 may be formed of an insulating material.

[0064] The terminal retainer 700 may include a body 710 and a plurality of second protrusions 720. The body 710 may be an arcuate member. The second protrusions 720 may be configured to protrude from one surface of the body 710. Each second protrusion 720 is a region that inserts into a fifth hole H5. That is, when the terminal retainer 700 is mounted on the base 500, the body 710 is disposed on one surface of the base 500, and the second protrusions 720 may be positioned in the fifth hole H5. The position of the second protrusions 720 corresponds to the position of the fifth hole H5 of the base 500. Furthermore, the number of second protrusions 720 corresponds to the number of fifth holes H5 of the base 500. For example, when a terminal retainer 700 with three second protrusions 720 disposed on one body 710 is defined as a group, two groups may be provided, that is, a total of six second protrusions 720 may be provided.

[0065] The slot 730 can be configured to pass through the body 710 and the second protrusion 720. The slot 730 is a slot through which the busbar 900 protruding upward from the interior of the base 500 passes.

[0066] Figure 10 This is a bottom view showing the base 500.

[0067] refer to Figure 10 The base 500 may include a plurality of third protrusions 602 projecting from another surface of the base 500. Each of the plurality of third protrusions 602 may be arranged along the circumference of the fifth hole H5. The third protrusions 602 are used to guide the generatrix 900 projecting upward from the interior of the base 500. The number of third protrusions 602 corresponds to the number of fifth holes H5.

[0068] Figure 11 This is a view showing the rib 603 of the base 500.

[0069] refer to Figure 10 The base 500 may include ribs 603 configured to project from the outer peripheral surface of the base 500. The ribs 603 are used for connection between the base 500 and the housing 1000. The base 500 is disposed inside the housing 1000. The ribs 603 are press-fitted along the inner peripheral surface of the housing 1000 to connect the base 500 to the housing 1000. The ribs 603 may be arranged at regular intervals along the circumferential direction of the base 500.

[0070] Each rib 603 can be formed such that the circumferential width W decreases from the upper surface 501 of the base 500 toward the lower surface 502. Ribs 603 of this shape guide the base 500 to be easily press-fitted along the inner circumferential surface of the housing 1000. Grooves 1100 for insertion of the ribs 603 can also be provided in the inner circumferential surface of the housing 1000.

[0071] The above embodiments have described examples of internal rotor type motors, but the present invention is not limited thereto. The present invention can also be applied to external rotor type motors. Furthermore, the present invention can be used in various devices, such as vehicles or household appliances.

Claims

1. An electric motor, comprising: axis; Bearings, supporting the shaft; The protective cover includes a first hole through which the shaft passes; as well as The base includes a second hole through which the shaft passes. The protective cover includes: a first region disposed in the base; and a second region extending from the first region, protruding outward from the base, and having the first hole. The bearing is disposed in the first hole. The protective cover includes a plurality of fourth holes disposed in the first region; and The base includes a third protrusion through each of the fourth holes.

2. The motor according to claim 1, wherein, The shield includes a flange inserted into the base and a first protrusion projecting from the flange, and The bearing includes an outer peripheral surface that contacts the inner surface of the first protrusion, and a first surface that at least a portion of it contacts the base.

3. The motor according to claim 1, wherein, The base includes a third region that contacts a portion of the bearing, and a second hole through which the shaft passes, wherein the diameter of the second hole is smaller than the diameter of the first hole.

4. The motor according to claim 3, wherein, The third region is configured to surround the first hole.

5. The motor according to claim 3, wherein, The third region supports the bearing.

6. The motor according to claim 1, wherein: The bearing includes a third hole through which the shaft passes; The diameter of the first hole is larger than the diameter of the second hole; and The diameter of the second hole is larger than the diameter of the third hole.

7. The motor according to claim 1, wherein, The first region has an annular plate shape, and the second region is a columnar member that bends and extends from the inside of the first region.

8. The motor according to claim 1, wherein, The third protrusion includes a fifth hole, which overlaps with the fourth hole in the axial direction.

9. The motor according to claim 8, wherein, A terminal retainer is installed in the fifth hole.

10. The motor according to claim 9, wherein: The terminal retainer includes an arcuate body and a plurality of second protrusions projecting from one surface of the body; The slots of the body and each of the second protrusions are provided in the terminal retainer; and Each of the plurality of second protrusions is connected to the fifth hole.

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