KR20240064950A - Motor - Google Patents

Abstract

The present invention, a stator; an outer gear disposed inside the stator; an inner gear disposed inside the outer gear; a shaft disposed inside the inner gear; and a bearing coupled to the shaft, wherein the inner gear includes a first region having a first inner diameter, a second region larger than the first inner diameter, and the first region and It includes a first step surface disposed at the boundary of the second area, the first area is in contact with the outer ring of the bearing, and the first step surface is in contact with the axial direction and one surface of the outer ring of the bearing. can be provided.

Description

Motor{Motor}

The embodiment relates to a motor.

Generally, a motor's rotor rotates due to electromagnetic interaction between the shaft, rotor, and stator. At this time, the shaft connected to the rotor also rotates to generate rotational driving force.

A pump including a motor, as a rotor, may include an outer gear and an inner gear inside the can. A shaft is disposed inside the inner gear. The inner gear is rotatably coupled to the shaft. A magnet may be placed on the outer surface of the outer gear. The magnet is placed opposite the stator with the can in between.

Due to the electrical interaction between the magnet and the stator, the can and the outer gear rotate around the shaft, and the inner gear rotates around the shaft in conjunction with the outer gear.

Inside the cap, the inner gear can flow in the up and down direction due to the pressure balance of the fluid. If the inner gear moves up and down, there is a high risk of damage by causing friction with adjacent parts. Additionally, due to friction, there is a problem that the durability of the parts decreases and the friction torque increases.

Accordingly, the embodiment is intended to solve the above problem, and the problem to be solved is to provide a motor that can prevent the inner gear from moving in the vertical direction.

The problem to be solved by the present invention is not limited to the problems mentioned above, and other problems not mentioned here will be clearly understood by those skilled in the art from the description below.

The embodiment includes a stator, an outer gear disposed inside the stator, an inner gear disposed inside the outer gear, a shaft disposed inside the inner gear, and a bearing coupled to the shaft, The inner gear includes a first region having a first inner diameter, a second region larger than the first inner diameter, and a first step surface disposed at a boundary between the first region and the second region, and the first region is in contact with the outer ring of the bearing, and the first step surface is in contact with the axial direction and one surface of the outer ring of the bearing.

The embodiment includes a stator, an outer gear disposed inside the stator, an inner gear disposed inside the outer gear, a shaft disposed inside the inner gear, and a bearing coupled to the shaft, The shaft includes a third region facing the inner gear and having a first outer diameter, a fourth region facing the inner gear and having a second outer diameter larger than the first outer diameter, and the third region and the fourth region. and a second step surface disposed at the boundary of the bearing, wherein the fourth area is in contact with the inner ring of the bearing, the second step surface is in contact with the axial direction and one surface of the inner ring of the bearing, and the bearing is in contact with the inner ring in the radial direction. It is possible to provide a motor arranged to overlap the inner gear.

The embodiment includes a stator, an outer gear disposed inside the stator, an inner gear disposed inside the outer gear, a shaft disposed inside the inner gear, and a bearing coupled to the shaft, The outer ring of the bearing is in contact with the inner surface of the inner gear, the inner ring of the bearing is in contact with the outer surface of the shaft, and one axial surface of the outer ring of the bearing is in contact with a first step surface located on the inner surface of the inner gear. , a motor can be provided in which one axial surface of the inner ring of the bearing is in contact with a second step surface located on the outer surface of the shaft.

According to the embodiment, since the inner gear is axially restrained by a bearing through the first step surface, the inner gear is prevented from moving in the axial direction, preventing damage to parts, ensuring durability, and reducing friction torque. There is an advantage in reducing it.

According to the embodiment, since the axial positions of the bearing and the inner gear are determined through the first step surface of the inner gear and the second step surface of the shaft, there is an advantage in that tolerance management is easy to reduce interference with other parts. .

According to the embodiment, the bearing is disposed inside the inner gear, which has the advantage of reducing the axial length of the motor.

1 is a cross-sectional view of a pump according to an embodiment,
Figure 2 is an exploded view of the pump shown in Figure 1;
Figure 3 is a view showing the outer gear, inner gear, bearing, and cover shown in Figure 1;
4 is a perspective view showing the outer gear of the rotor;
5 is an exploded view of the outer gear and magnet;
Figure 6 is a perspective view showing the inner gear;
Figure 7 is a side cross-sectional view of the inner gear based on AA in Figure 6;
8 is a side cross-sectional view of the shaft;
Figure 9 is a perspective view showing the plate;
Figure 10 is a bottom view of the plate;
Figure 11 is a side cross-sectional view of the motor showing the vicinity of the bearing.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

However, the technical idea of the present invention is not limited to some of the described embodiments, but may be implemented in various different forms, and as long as it is within the scope of the technical idea of the present invention, one or more of the components may be optionally used between the embodiments. It can be used by combining and replacing.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly specifically defined and described, are generally understood by those skilled in the art to which the present invention pertains. It can be interpreted as meaning, and the meaning of commonly used terms, such as terms defined in a dictionary, can be interpreted by considering the contextual meaning of the related technology.

Additionally, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In this specification, the singular may also include the plural unless specifically stated in the phrase, and when described as “at least one (or more than one) of A and B and C”, it is combined with A, B, and C. It can contain one or more of all possible combinations.

Additionally, when describing the components of an embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used.

These terms are only used to distinguish the component from other components, and are not limited to the essence, order, or order of the component.

And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to that other component, but also is connected to that component. It can also include cases where other components are 'connected', 'combined', or 'connected' due to another component between them.

Additionally, when described as being formed or disposed “above” or “below” each component, “above” or “below” refers not only to cases where two components are in direct contact with each other, but also to one This also includes cases where another component described above is formed or placed between two components. In addition, when expressed as “top (above) or bottom (bottom)”, it can include not only the upward direction but also the downward direction based on one component.

The 'axial direction' used below is defined as the direction forming the rotation center of the rotor, inner gear, and outer gear. The 'axial direction' may be the direction in which components decomposed based on FIG. 2 are combined. 'Axis direction' can be defined as the up and down direction.

The 'radial direction' used below is defined as the direction perpendicular to the 'axial direction' described above. The 'radial direction' may be defined as the direction in which the lobe protrudes from the inner surface of the outer gear and the direction in which the lobe protrudes from the inner surface of the inner gear.

The 'circumferential direction' used below is the circumferential direction of any one of the stator, rotor, outer gear, and inner gear, or the circumferential direction of any one of the stator, rotor, outer gear, and inner gear and the area forming a virtual concentric circle. It can be defined as the circumferential direction.

Figure 1 is a cross-sectional view of a pump according to an embodiment, Figure 2 is an exploded view of the pump shown in Figure 1, and Figure 3 is a diagram showing the outer gear, inner gear, bearing, and cover shown in Figure 1. .

1 to 3, the housing 20 is coupled to the cover 10. A motor is placed in the internal space formed by the cover 10 and the housing 20. The cover 10 and the housing 20 may be coupled through a separate fastening member 30.

The cover 10 may include an outlet 11 and an inlet 12 on a surface facing the outer gear 210 and the inner gear 220 in the axial direction. Fluid flows into the rotor 200 through the inlet 12, and the fluid inside the rotor 200 is discharged through the outlet 11.

The shaft 100 is disposed on the cover 10. The shaft 100 may be integrated with the cover 10. This shaft 100 includes a third area A3, a fourth area A4 connected to the end of the third area A3, and a fifth area A5 connected to the end of the fourth area A4. may include. The third area A3 and the fourth area A4 are arranged to be stepped. The third area A3 is an area where the bearing 500 is mounted.

The fifth area A5 corresponds to the plate 400. The fifth area A5 may be inserted into the hole (H in FIG. 9 ) of the plate 400. The shaft 100 may include a fastening hole (101 in FIG. 8) disposed across the third area A3 and A5 in the axial direction. The fastening member 30 can be fastened to the fastening hole 101 to couple the plate 400 to the shaft 100.

The cross section of the third area A3 may be circular, but the cross section of the fourth area A4 may have a shape including a straight line. The center of the third area A3 and the center of the fourth area A4 may be the same. The center of the shaft 100 is disposed eccentrically with the center of the bearing 500. Accordingly, the center of the shaft 100 corresponds to the rotation center of the inner gear 220, and the rotation center of the bearing 500 corresponds to the rotation center of the outer gear 210.

The motor includes a rotor 200 and a stator 300. The stator 300 may be placed on the outside of the can 600, and the rotor 200 may be placed on the inside of the can 600. The can 600 may be a cylindrical member with one side open. The can 600 is coupled to the cover 10. The interior of the can 600 is sealed with a space through which fluid flows. The inlet 11 and outlet 11 of the cover 10 and the shaft 100 are disposed inside the can 600.

The rotor 200 may include a rotor core 200A and a magnet 200B. The magnet 200B may be disposed on the outer surface of the rotor core 200A. A plurality of magnets 200B may be arranged along the circumference of the rotor core 200A. Here, the rotor core 200A can be divided into an outer gear 210 and an inner gear 220. The inner gear 220 is rotatably coupled to the shaft 100. The outer gear 210 is disposed outside the inner gear 220.

The stator 300 is disposed outside the can 600. And the stator 300 is fixed to the housing 20. The stator 300 may include a stator core 310, an insulator 320 mounted on the stator core 310, and a coil 330. The coil 330 may be wound around the insulator 320. The insulator 320 is disposed between the coil 330 and the stator core 310 and serves to electrically insulate the stator core 310 and the coil 330 from each other. The coil 330 causes electrical interaction with the magnet 200B of the rotor 200.

The plate 400 is placed inside the can 600 and on one side of the rotor 200. This plate 400 is coupled to the shaft 100.

The bearing 500 is disposed inside the can 600 and is coupled to the inner gear 220. The bearing 500 rotatably supports the inner gear 220.

When the inner gear 220 rotates, it has a certain eccentric structure with respect to the outer gear 210, and this eccentricity creates a space between the outer gear 210 and the inner gear 220 to transport fluid. . That is, during the rotational movement of the outer gear 210, the portion whose volume increases sucks the surrounding fluid due to a pressure drop, and the portion whose volume decreases discharges fluid due to an increase in pressure.

FIG. 4 is a perspective view showing the outer gear 210 of the rotor 200, and FIG. 5 is an exploded view of the outer gear 210 and the magnet 200B.

Referring to FIGS. 4 and 5 , the outer gear 210 forms a space 210a inside which the inner gear 220 is located. Additionally, the outer gear 210 may turn inward in the radial direction to form N outer lobes 210b along the circumferential direction. And the outer gear 210 may include a groove 213 for accommodating the magnet 200B on its outer surface. A plurality of grooves 213 are disposed along the circumference of the outer surface of the outer gear 210. A guide 212 is disposed between grooves 213 and grooves 213 in the circumferential direction. The guide 212 protrudes in the radial direction from the outer surface of the outer gear 210 and may be formed to be long along the axial direction.

The side of the guide 212 faces the side of the magnet 200B disposed in the groove 213. The cross-sectional shape of the guide 212 may be polygonal. The outer gear 210 may include a protrusion 214 that contacts one axial surface of the magnet 200B.

Figure 6 is a perspective view showing the inner gear, and Figure 7 is a side cross-sectional view of the inner gear taken along line A-A of Figure 6.

A bearing 500 is disposed inside the inner gear 220. The structure of the inner gear 220 for this is as follows.

Referring to FIGS. 6 and 7 , the inner gear 220 includes a first area A1 and a second area A2. The first area A1 has a first inner diameter D1 and a second inner diameter D2 that is smaller than the first inner diameter D1 of the second area A2. This inner gear 220 includes a first step surface ST1. The first step surface ST1 is disposed at the boundary between the first area A1 and the second area A2.

The first step surface ST1 may be disposed on a plane perpendicular to the axial direction. This first step surface ST1 contacts one surface of the outer ring 510 of the bearing 500 and serves to support the bearing 500 in the axial direction.

The axial length L1 of the first area A1 may be longer than the axial length (B1 in FIG. 11) of the bearing 500. The axial length L1 of the first area A1 is smaller than the axial length (M in FIG. 11) of the magnet 200B. And the axial length L1 of the first area A1 may be different from the axial length L2 of the second area A2.

Figure 8 is a side cross-sectional view of the shaft 100.

Referring to FIG. 8 , the shaft 100 may include a third area (A3) and a fourth area (A4) facing the inner gear 220. Additionally, the shaft 100 may include a fifth area A5 facing the hole (H in FIG. 9 ) of the plate 400. The fifth area A5 is disposed in the hole H. The third area A3 has a first outer diameter O1. The fourth area A4 has a second outer diameter O2 that is larger than the first outer diameter O1. The shaft 100 includes a second step surface ST2. The second step surface ST2 is disposed at the boundary between the third area A3 and the fourth area A4.

The fifth area A5 is connected to one side of the third area A3.

The shaft 100 includes a third step surface ST3. The third step surface ST3 is disposed at the boundary between the third area A3 and the fifth area A5.

The second step surface ST2 may be disposed on a plane perpendicular to the axial direction. This second step surface (ST2) contacts one surface of the inner ring 520 of the bearing 500 and serves to support the bearing 500 in the axial direction together with the first step surface (ST1).

The axial length L3 of the third area A3 may be longer than the axial length B of the bearing 500. Additionally, the axial length L3 of the third area A3 may be smaller than the axial length L4 of the fourth area A4.

The third step surface ST3 may be disposed on a plane perpendicular to the axial direction. This third step surface ST3 contacts one surface of the plate 400 to secure the fixing force between the plate 400 and the shaft 100 and determines the axial position of the plate 400.

FIG. 9 is a perspective view showing the plate 400, and FIG. 10 is a bottom view of the plate 400.

9 and 10, the plate 400 is coupled to the shaft 100 and covers one side of the rotor 200 in the axial direction. A hole (H) is disposed at a position eccentric to the center of the plate 400. The second area A2 of the shaft 100 is inserted into the hole H. The shape of the hole H corresponds to the cross-sectional shape of the second area A2.

Meanwhile, the plate 400 includes a surface that faces the outer gear 210 and the inner gear 220 in the axial direction, and has a first flow path 401 and a second flow path 402 that are concavely formed on the surface. It can be included. The first flow path 401 is arranged to correspond to the inlet 12. The second flow path 402 is arranged to correspond to the outlet 11.

Figure 11 is a side cross-sectional view of the motor showing the vicinity of the bearing 500.

Referring to FIG. 11, the bearing 500 is disposed inside the inner gear 220. The outer ring 510 of the bearing 500 contacts the first area A1 of the inner gear 220. The second area A2 of the inner gear 220 is disposed to face the shaft 100. The first area A1 is arranged to overlap the magnet 200B in the radial direction. And the bearing 500 is arranged to overlap the inner gear 220 in the radial direction. As the bearing 500 is disposed inside the inner gear 220, there is an advantage in reducing the axial length (L1) of the motor.

While the plate 400 is in contact with the third step surface ST3, the fastening member 30 is fastened to the fastening hole H of the shaft 100. With the head of the fastening member 30 in contact with the other surface of the plate 400, the plate 400 is pressed to fasten the plate 400 to the shaft 100.

Meanwhile, the first step surface ST1 and the second step surface ST2 may be located on the same plane. One surface of the outer ring 510 of the bearing 500 contacts the first step surface ST1, and one surface of the inner ring 520 of the bearing 500 contacts the second step surface ST2. Since the inner gear 220 is axially restrained by the bearing 500 through the first step surface ST1, the inner gear 220 is prevented from moving in the axial direction, thereby preventing damage to parts and improving durability. can be secured and the friction torque can be reduced. And because the axial positions of the bearing 500 and the inner gear 220 are determined through the first step surface (ST1) of the inner gear 220 and the second step surface (ST2) of the shaft 100, other components Tolerance management is easy to reduce interference.

In the above, even though all the components constituting the embodiment of the present invention have been described as being combined or operated in combination, the present invention is not necessarily limited to this embodiment. That is, as long as it is within the scope of the purpose of the present invention, all of the components may be operated by selectively combining one or more of them. In addition, terms such as 'include', 'comprise', or 'have' described above mean that the corresponding component may be present, unless specifically stated to the contrary, and therefore do not exclude other components. Rather, it should be interpreted as being able to include other components. All terms, including technical or scientific terms, unless otherwise defined, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Commonly used terms, such as terms defined in a dictionary, should be interpreted as consistent with the contextual meaning of the related technology and, unless explicitly defined in the present invention, should not be interpreted in an idealized or overly formal sense.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but rather to explain it, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

The above-described embodiments can be used in various devices such as vehicles or home appliances.

10: cover
20: housing
30: fastening member
100: shaft
200: rotor
200A: rotor core
200B: Magnet
210: outer gear
211: first extension
220: inner gear
300: Stator
400: plate
500: Bearing
600: can
ST1: First step surface
ST2: Second step surface
ST3: Third step surface

Claims (15)

stater;
an outer gear disposed inside the stator;
an inner gear disposed inside the outer gear;
A shaft disposed inside the inner gear; And
Includes a bearing coupled to the shaft,
The inner gear includes a first region having a first inner diameter, a second region larger than the first inner diameter, and a first step surface disposed at a boundary between the first region and the second region,
The first area is in contact with the outer ring of the bearing, and the first step surface is in contact with the axial direction and one surface of the outer ring of the bearing. According to claim 1,
A motor wherein the axial length of the first area is longer than the axial length of the bearing. According to claim 1,
The motor wherein the axial length of the first area and the axial length of the second area are different from each other. According to claim 1,
Further comprising a magnet disposed on the outer gear,
The first area is a motor arranged to overlap the magnet in a radial direction. According to claim 1,
Further comprising a magnet disposed on the outer gear,
A motor in which the axial length of the first area is smaller than the axial length of the magnet. stater;
an outer gear disposed inside the stator;
an inner gear disposed inside the outer gear;
A shaft disposed inside the inner gear; And
Includes a bearing coupled to the shaft,
The shaft includes a third region facing the inner gear and having a first outer diameter, a fourth region facing the inner gear and having a second outer diameter larger than the first outer diameter, and the third region and the fourth region. It includes a second step surface disposed at the border of
The fourth region is in contact with the inner ring of the bearing, and the second step surface is in contact with the axial direction and one surface of the inner ring of the bearing,
A motor in which the bearing is arranged to overlap the inner gear in a radial direction. According to claim 1,
A motor in which the axial length of the third region is longer than the axial length of the bearing. According to claim 1,
A motor in which the axial length of the third area is smaller than the axial length of the fourth area. According to claim 1,
It is disposed on one side of the inner gear and includes a plate including a hole,
the shaft includes the fifth region disposed at an end of the third region,
The fifth area is a motor disposed in the hole. According to clause 9,
It includes a third step surface disposed at a boundary between the third area and the fifth area,
A motor in contact with the third step surface and one surface of the plate. According to clause 9,
The shaft includes a fastening hole,
A motor further comprising a fastening member in the fastening hole, wherein the head of the fastening member contacts the other surface of the plate. stater;
an outer gear disposed inside the stator;
an inner gear disposed inside the outer gear;
A shaft disposed inside the inner gear; And
Includes a bearing coupled to the shaft,
The outer ring of the bearing is in contact with the inner surface of the inner gear, and the inner ring of the bearing is in contact with the outer surface of the shaft,
A motor in which one axial surface of the outer ring of the bearing contacts a first step surface located on the inner surface of the inner gear, and one axial surface of the inner ring of the bearing contacts a second step surface located on the outer surface of the shaft. According to claim 12,
The first step surface and the second step surface are arranged on the same plane perpendicular to the axial direction. According to claim 12,
A motor in which the bearing is arranged to overlap the outer gear in a radial direction. According to claim 12,
Further comprising a magnet disposed on the outer gear,
The first step surface and the second step surface are arranged to overlap the magnet in a radial direction.

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