KR20200029668A - Control module of electric oil pump - Google Patents

Abstract

The present invention relates to an electric oil pump. The electric oil pump according to one aspect includes: a housing having a space unit on the upper surface thereof; a cover which is coupled to the upper surface of the housing and covers the space unit; a motor disposed under the housing; and a printed circuit board which is disposed in the space unit and in which an electronic component is placed on the lower surface. In the printed circuit board, a mounting hole penetrating the lower surface from the upper surface is formed in an area in which the electronic component is disposed. A metal member is disposed in the mounting hole.

Description

Control module of electric oil pump

This embodiment relates to an electric oil pump.

Oil pump serves to discharge the flow rate at a constant pressure. The oil circulated by the oil pump is used to operate a hydraulic system using hydraulic pressure, or for cooling or lubrication effects.

A mechanical oil pump (MOP) is an oil pump that operates using the power of a machine such as an engine. Recently, research on hybrid vehicles and electric vehicles has been actively conducted for the purpose of improving fuel efficiency and reducing carbon emissions. Accordingly, there is an increasing demand for an electric oil pump (EOP) operated by the power of a motor instead of a mechanical oil pump (MOP) operated by the power of a machine such as an engine.

The electric oil pump is externally formed by a housing. Inside the housing, a stator and a rotor disposed inside the stator and rotating together with a shaft may be disposed. Therefore, by supplying power to the pump when the shaft rotates, oil can be supplied.

Meanwhile, a control module including a printed circuit board on which a plurality of electronic components are mounted may be disposed on the upper or lower surface of the housing. For example, an inner space accommodating the printed circuit board may be formed on an upper surface of the housing, and a separate cover may be combined to cover the inner space.

A plurality of electronic components may be mounted on the printed circuit board. The plurality of electronic components may be electrically connected to each other through a circuit pattern formed on the printed circuit board. The electronic components generate heat by driving. Since the generated heat may impede or damage the operation of electronic components, heat dissipation in the housing is an essential factor to be considered in product design.

However, according to the prior art, due to the low thermal conductivity of the printed circuit board itself, there is a problem that heat generated from an electronic component is not easily discharged to the outside of the housing.

The present invention is proposed to improve the above problems, and to provide an electric oil pump capable of improving heat dissipation efficiency by improving the arrangement structure of parts.

The electric oil pump according to the present embodiment includes a housing in which a space portion is formed on an upper surface; A cover coupled to an upper surface of the housing to cover the space portion; A motor disposed under the housing; And a printed circuit board disposed on the space portion and on which a electronic component is disposed, a mounting hole penetrating the lower surface from an upper surface is formed in an area where the electronic component is disposed on the printed circuit board, and the mounting hole In the metal member is disposed.

Through this embodiment, the heat of the electronic component can be released in both directions, and thus there is an advantage in that the heat dissipation efficiency is improved.

In particular, since the thermal conductivity of the printed circuit board itself is very low, there is an advantage in that a hole is formed in the printed circuit board and a metal member having excellent thermal conductivity is disposed in the hole to allow the generated heat to flow to a wider area.

1 is a cross-sectional view showing the configuration of an electric oil pump according to an embodiment of the present invention.
Figure 2 is a cross-sectional view showing the A of Figure 1;
3 is a view showing a heat dissipation structure of a control module according to an embodiment of the present invention.

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

However, the technical spirit of the present invention is not limited to some embodiments described, but may be implemented in various different forms, and within the technical spirit scope of the present invention, one or more of its components between embodiments may be selectively selected. It can be used by bonding and substitution.

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

In addition, 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 the present specification, the singular form may also include the plural form unless specifically stated in the phrase,? And (w) when it is described as at least one of B and C (or one or more), it may include one or more of all combinations that can be combined with A, B, and C.

In addition, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used.

These terms are only for distinguishing the component from other components, and the term is not limited to the nature, 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 the other component, but also the component It may also include the case of 'connected', 'coupled' or 'connected' due to another component between and other components.

 Further, when described as being formed or disposed in the "top (top) or bottom (bottom)" of each component, the top (top) or bottom (bottom) is not only when the two components are in direct contact with each other. Also included is the case where one or more other components are formed or disposed between the two components. In addition, when expressed as "up (up) or down (down)", it may include the meaning of the downward direction as well as the upward direction based on one component.

1 is a cross-sectional view showing a configuration of an electric oil pump according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing A of FIG. 1, and FIG. 3 is a view showing a heat dissipation structure of a control module according to an embodiment of the present invention to be.

1 to 3, the electric oil pump 100 according to the embodiment of the present invention, the outer shape may be formed by the housing (11). A cover 30 may be coupled to the upper side of the housing 11.

A motor is disposed under the housing 11. The area of the housing 11 in which the motor is disposed may be referred to as a motor housing 10. The motor may include a stator 12 disposed inside the motor housing 10 and a rotor 16 disposed inside the stator 12 and rotated together with the shaft 18.

A coil 14 may be wound on the stator 12, and a magnet (not shown) may be disposed on the rotor 16. Accordingly, when a current is applied to the coil 14, the rotor 16 and the shaft 18 may rotate together by electromagnetic interaction between the stator 12 and the rotor 16. Bearings 20 and 22 that support rotation of the shaft 18 may be additionally disposed in upper and lower regions of the motor housing 10.

Therefore, when the shaft 18 is rotated, power is supplied through a pump to allow the fluid containing oil to flow. The pump may be disposed together in the housing 10 spaced apart from the motor. For example, a pump is disposed at the lower end of the shaft 18 to receive power from the shaft 18. In addition, a sensor magnet 18a is disposed on an upper end of the shaft 18, so that the position of the shaft 18 can be sensed by a control module to be described later.

The housing 11 may be formed of a plastic or resin material. In addition, the housing 11 may be formed of a thermally conductive plastic material. The thermally conductive plastic material may include pellet type resin, heat dissipation resin, polyphtalamide (PPA) resin, carbon nanotube (CNT), and the like.

A space portion 13 on which an electronic component for driving the motor or the pump is disposed may be formed on the upper surface of the housing 11. The space part 13 may be formed by being recessed downward from the upper surface of the housing 11. Due to this, an edge portion that divides the space portion 13 from another region may be formed on the upper surface of the housing 11. A groove 11a may be formed on an upper surface of the edge portion, and a rib 39 may be formed in an area of the lower surface of the cover 30 that faces the groove 11a. Therefore, the rib 39 is accommodated in the groove 11a so that the cover 30 can be coupled to the housing 11.

The cover 40 may be coupled to the upper surface of the housing 11 to shield the space 13. The cover 40 may be formed of a metal material. A plurality of heat radiation fins 32 protruding upward may be formed on the upper surface of the cover 40. Accordingly, heat generated from the space portion 12 may be discharged to the outside through the cover 40. The formation region of the heat dissipation fin 32 may be a region overlapping with the electronic component 42 to be described later in the upper and lower directions.

A printed circuit board 40 may be disposed in the space part 13. The printed circuit board 40 may include an inverter and an inverter driving circuit. That is, the printed circuit board 40 may be understood as a control module for transmitting and receiving respective components and control signals of the electric oil pump 100. When current is supplied to the coil 14 through the printed circuit board 40, the rotor 16 and the shaft 18 may be rotated. The cross-sectional shape of the printed circuit board 40 may correspond to the cross-sectional shape of the space portion 12.

One or more electronic components 42 for driving the electric oil pump 100 may be mounted on the printed circuit board 40. The electronic components 42 may be mounted on the upper and lower surfaces of the printed circuit board 40, respectively. The electronic components 42 may be electrically connected to each other through circuit patterns formed on upper and lower surfaces of the printed circuit board 40.

Hereinafter, the heat dissipation structure of the electric oil pump 100 will be described.

The electronic component 42 is understood as a heating element that generates heat by driving. The electronic component 42 may be disposed on the lower surface of the printed circuit board 40. The electronic component 42 may be disposed under the printed circuit board 40. When the surface of the printed circuit board 40 facing the cover 30 is referred to as an upper surface of the printed circuit board 40, the lower surface may be understood as a surface facing the upper surface.

The electronic component 42 may be electrically connected to the printed circuit board 40 through a lead wire 42. The lead wire 42 may extend outside the electronic component 42 and be coupled to a hole (not shown) formed on the printed circuit board 40. At this time, the lead wire 42 may be soldered to the hole. The soldered area on the printed circuit board 40 may be an area where a circuit pattern is formed. Due to this, the electronic component 42 can be electrically connected to the printed circuit board 40.

A metal plate 44 may be disposed on the outer surface of the electronic component 42. For example, the metal plate 44 may be disposed on the lower surface of the electronic component 42. Therefore, when heat is generated from the electronic component 42, heat generated through the metal plate 44 may be discharged to the outside. That is, the heat generated by the electronic component 42 may be moved downward.

A mounting hole 45 may be formed in an area where the electronic component 42 is disposed on the printed circuit board 40. The mounting hole 45 may be formed through the lower surface from the upper surface of the printed circuit board 40. The cross-sectional area of the mounting hole 45 may be smaller than that of the electronic component 42. Alternatively, the cross-sectional area of the mounting hole 45 may be formed equal to or larger than the cross-sectional area of the electronic component 42. Therefore, when heat is generated according to the operation of the electronic component 42, the generated heat may be conducted upwardly of the printed circuit board 40.

A metal member 50 may be disposed in the mounting hole 45. At least part of the metal member 50 may be accommodated in the mounting hole 45. The upper and lower portions of the metal member 50 may have a shape protruding upward from the upper surface of the printed circuit board 40, or protruding downward from the lower surface of the printed circuit board 40, respectively. Due to this, the area of the metal member 50 accommodated in the mounting hole 45 may have a smaller cross-sectional area than other areas. Alternatively, the metal member 50 is accommodated in the mounting hole 45, so that the upper and lower surfaces of the printed circuit board 40 may form the same plane, respectively.

The metal member 50 may be formed of a metal material having excellent thermal conductivity. For example, the material of the metal member 50 may be copper (Cu).

The electronic component 42 is disposed on the lower surface of the metal member 50. The upper surface of the electronic component 42 may contact the lower surface of the metal member 50. The lower surface of the metal member 50 may protrude downward than the lower surface of the printed circuit board 40.

An insulating sheet 60 made of an insulating material may be disposed on the upper surface of the metal member 50. The insulating sheet 60 covers the upper surface of the metal member 50 to insulate the cover 30, which is a metal material, and the metal member 50. In some cases, the insulating sheet 60 is coated with adhesive on both sides, the upper surface is coupled to the inner surface of the cover 30, and the lower surface can be coupled to the upper surface of the metal member 50.

In summary, based on the metal member 50, the insulating sheet 60 and the electronic component 42 may be disposed to overlap in the upper and lower directions, respectively.

Meanwhile, a first protruding portion 35 protruding downward from another region may be formed in an area of the inner surface of the cover 30 facing the metal member 50 or the electronic component 42. At this time, the lower surface of the first protrusion 35 may contact the upper surface of the insulating sheet 60. Alternatively, the lower surface of the first protrusion 35 may be spaced apart from the upper surface of the insulating sheet 60 by a predetermined distance. Accordingly, heat generated from the electronic component 42 may be directly transferred to the cover 30 through the first protrusion 35.

In addition, a second protruding portion 28 protruding upward from the other region may be formed in an area of the bottom surface of the space 13 facing the electronic component 42 in an up and down direction. The upper surface of the second protrusion 28 may be in contact with the lower surface of the electronic component 42 or may be disposed to be spaced a predetermined distance from the lower surface of the electronic component 42. At this time, an area of the electronic component 42 contacting an upper surface of the second protrusion 28 may be a lower surface of the metal plate 44. Accordingly, heat generated from the electronic component 42 may be transferred to the housing 11 through the second protrusion 28. At this time, since the material of the housing 11 is formed of a resin or plastic material, insulation between the electronic component 42 and the housing 11 is not a problem.

According to the above structure, when heat is generated from the electronic component 42, heat generated through the metal plate 44 may move downward. As described above, since the material of the housing 11 is formed of a thermally conductive plastic material, generated heat can be discharged to the outside through the housing 11.

Further, heat generated from the electronic component 42 may be moved upward. That is, when heat is generated from the electronic component 42, it is transferred upward through the metal member 50 to move to the cover 30 provided with the heat dissipation fin 32.

Therefore, according to the electric oil pump 100 according to the embodiment of the present invention, the heat of the electronic component 42 can be discharged in both directions, that is, there is an advantage that heat dissipation efficiency is improved.

In particular, since the thermal conductivity of the printed circuit board itself is very low, a mounting hole 45 is formed in the printed circuit board 40 and a metal member 50 having excellent thermal conductivity is disposed in the mounting hole 45, resulting in It has the advantage of allowing heat to flow over a wider area.

Meanwhile, although not shown, one or more through holes penetrating the lower surface from the upper surface may be formed in the metal member 50. Accordingly, when heat is generated from the electronic component 42, some may be conducted upward through the metal member 50, and some may be convected upward directly through the through hole.

In the above, even if all the components constituting the embodiments of the present invention are described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, if it is within the scope of the present invention, all of the components may be selectively combined and operated. In addition, the terms 'include', 'consist' or 'have' as described above means that the corresponding component can be intrinsic, unless specifically stated otherwise, to exclude other components. It should not be interpreted as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as generally understood by a person skilled in the art to which the present invention pertains, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted as being consistent with the contextual meaning of the related art, and are not to be interpreted as ideal or excessively formal meanings unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

Claims (10)

A housing in which a space portion is formed on an upper surface;
A cover coupled to an upper surface of the housing to cover the space portion;
A motor disposed under the housing; And
It is disposed on the space portion, and includes a printed circuit board on which an electronic component is disposed,
In the area where the electronic component is disposed on the printed circuit board, a mounting hole penetrating the lower surface from the upper surface is formed,
An electric oil pump in which a metal member is disposed in the mounting hole.
According to claim 1,
An electric oil pump having an upper surface of the electronic component in contact with a lower surface of the metal member.
According to claim 1,
The cover is formed of a metal material,
An electric oil pump in which a heat radiating fin protruding upward is disposed on an upper surface of the cover.
The method of claim 3,
An electric oil pump in which an insulating sheet made of an insulating material is disposed on the upper surface of the metal member.
According to claim 1,
In the metal member, an upper region protrudes upward from an upper surface of the printed circuit board, and a lower region protrudes downward from a lower surface of the printed circuit board,
The area of the metal member accommodated in the mounting hole is an electric oil pump having a smaller cross-sectional area than other areas.
According to claim 1,
An electric oil pump in which a metal plate of a metal material is disposed on a lower surface of the electronic component.
The method of claim 6,
The material of the housing is an electric oil pump made of a thermally conductive plastic material.
According to claim 1,
An electric oil pump having a first protruding portion protruding downward is disposed on an inner surface of the cover facing the metal member or the electronic component in an up and down direction.

According to claim 1,
An electric oil pump in which a second protruding part protruding upward is disposed in an area facing the metal member in an up and down direction among the bottom surfaces of the space part.
According to claim 1,
An electric oil pump having one or more through holes penetrating the lower surface from the upper surface of the metal member.

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