KR102154752B1 - Electric oil pump - Google Patents

Abstract

The present invention provides an electric oil pump comprising: a pump unit which sucks and discharges oil from the outside; a control unit disposed on one side of the pump unit and including a control housing, a coupling member for coupling the control housing to the pump unit, and control elements disposed inside the control housing; and a motor unit installed in the pump unit and configured to circulate some of the oil sucked by the pump unit. Among the control elements, ones in which the amount of heat generated is equal to or greater than a preset reference value are disposed at a position adjacent to the coupling member. According to the electric oil pump according to the present invention, some of the oil sucked by the pump unit is supplied to the motor unit and circulated, and a control element with the largest amount of heat among the control elements of the control unit is disposed adjacent to a portion where the control unit and the pump unit are coupled to each other. Therefore, the control element can be cooled by using the sucked oil. In addition, according to the electric oil pump of the present invention, the control element can be cooled without additional cooling water being supplied, and the number of parts and a manufacturing cost of a product can be reduced.

Description

Electric oil pump

The present invention relates to an electric oil pump, and more particularly, to a pump that is driven by receiving current from the outside to suck and discharge oil.

In order to improve fuel efficiency of a vehicle's engine and transmission, various types of electric oil pumps are currently being applied to vehicles as compared to the existing mechanical oil pumps. The application of an electric water pump (EWP) for engine cooling is expanding to improve the cooling performance and fuel economy of the engine, and the application of the electric oil pump (EOP) is expanding to improve the fuel efficiency of the transmission. In addition, as eco-friendly vehicles increase, the use of a power electric water pump (PEWP) for cooling power components is also increasing.

Most of the electric oil pumps are applied with a three-phase brushless motor (BLDC or BLAC type), and a sensorless control method is used as the motor control method. Depending on the purpose of use, the voltage applied to the electric oil pump may represent a high voltage or a low voltage.It can be said that it is an important factor to effectively cool the heat generated from the control unit in both the high voltage electric oil pump and the low voltage electric oil pump .

In general, a low voltage electric oil pump includes a pump unit and a motor unit attached to a transmission, and a control unit for controlling the pump unit and a motor unit. Since such a low-voltage electric oil pump does not have a separate mechanical oil pump, it must be continuously driven in the entire driving cycle, and thus heat generated from the control device needs to be effectively cooled.

In the case of a cooling device of a conventional electric oil pump, a heat dissipation structure using cooling water is applied. In this case, not only the size of the control unit is increased, but a separate structure for supplying cooling water must be added, so that the weight of the product, the number of parts, and manufacturing cost are increased.

The present invention has been created to solve the above problems, and an object of the present invention is to provide an electric oil pump capable of effectively cooling a control element of a control unit without separately supplying cooling water.

The present invention, a pump unit that sucks and discharges oil from the outside; A control unit disposed on one side of the pump unit, the control unit including a control housing, a coupling member coupling the control housing to the pump unit, and a control element disposed inside the control housing; And a motor unit installed in the pump unit and in which some of the oil sucked by the pump unit circulates inside, wherein the control element exhibiting a heat amount greater than or equal to a preset reference value is disposed at a position adjacent to the coupling member It provides an electric oil pump that can be used.

The pump unit includes a pump housing having a discharge port through which oil circulating in the motor unit is introduced and discharged to the outside, and a pump rotor accommodated in the pump housing and sucks and discharges oil from the outside through rotation. , The coupling member is coupled to a portion between the motor unit and the discharge port of the pump housing.

The control unit further includes a controller plate on which the control element is seated, and a connector installed on the controller plate and inserted into the motor unit through the coupling member, wherein the amount of heat generated among the control elements is greater than or equal to a preset reference value. It is disposed at a position adjacent to the connector.

The pump unit includes a pump housing having an oil discharge port formed therein, and a pump rotor accommodated in the pump housing, and the motor unit includes a motor housing, a drive motor installed inside the motor housing, and the drive motor It is coupled to, and is coupled to the pump rotor through the pump housing, and includes a rotation shaft through which the oil sucked by the pump rotor is supplied to the drive motor side through the inner wall of the pump housing.

The pump unit further includes a protruding member protruding from the pump housing toward the motor unit and surrounding the rotation shaft, wherein the motor unit is installed at an end of the motor housing at the pump unit side, and has a ring shape surrounding the protruding member And a support member through which oil circulating the motor unit flows into the discharge port through the protrusion member, and the coupling member is disposed radially outside the support member.

The motor unit further includes an auxiliary housing formed on a surface of the motor housing opposite to the pump unit, and a bearing pressed into the auxiliary housing and rotatably supporting the rotation shaft.

The motor unit further includes a sealing wall protruding upward from the auxiliary housing, and a sealing cap that is press-fitted into the sealing wall to seal the inside of the auxiliary housing.

According to the electric oil pump according to the present invention, some of the oil sucked by the pump unit is supplied to the motor unit and circulated, and the largest amount of heat among the control elements of the control unit is disposed adjacent to the part where the control unit and the pump unit are coupled to each other. , The control element can be cooled using the sucked oil. Therefore, according to the electric oil pump according to the present invention, it is possible to cool the control device without separately supplying cooling water, and it is possible to reduce the number of parts and manufacturing cost of the product.

1 is a perspective view of an electric oil pump according to the present invention.
FIG. 2 is a diagram illustrating a state in which the control cover is removed from FIG. 1.
3 is a front view of FIG. 1.
FIG. 4 is a cross-sectional view illustrating the electric oil pump cut along line AA in FIG. 1.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those of ordinary skill in the art will appreciate that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

1 to 4, the electric oil pump 1000 according to the present invention includes a pump unit 1100, a control unit 1200, and a motor unit 1300.

The pump unit 1100 sucks and discharges oil from the outside, and includes a pump housing 1110, a pump rotor 1120, and a protruding member 1130. Referring to Figure 4, the pump housing 1110, the pump rotor 1120 is accommodated inside, the suction port 1111 through which oil is sucked into the inside, and the oil circulating inside is discharged to the outside. A discharge port 1112 is formed. The pump rotor 1120 is accommodated in the pump housing 1110 and sucks and discharges oil from the outside through rotation. The protruding member 1130 is disposed to protrude from the surface of the pump housing 1110 to the motor unit 1300 toward the motor unit 1300 and surround the rotation shaft 1330 of the motor unit 1300 do.

The control unit 1200 is disposed on one side of the pump unit 1100 and controls driving of the motor unit 1300. The motor unit 1300 is installed in the pump unit 1100 and rotates the pump rotor 1120 to allow oil to be sucked and discharged. Referring to FIG. 4, the motor unit 1300 includes a motor housing 1310, a drive motor 1320, a rotation shaft 1330, and a support member 1340. The motor housing 1310 is mounted on the pump housing 1110, and the driving motor 1320 and the rotation shaft 1330 are accommodated therein.

The drive motor 1320 rotates the pump rotor 1120 by rotating the rotation shaft 1330, and includes a motor rotor 1321 and a motor stator 1322. The motor rotor 1321 is made of a permanent magnet. The motor stator 1322 is made of an electromagnet and is disposed to surround the motor rotor 1321. The motor stator 1322 includes a hollow cylindrical yoke, a core formed on an inner circumferential surface of the yoke and spaced apart from each other along the circumferential direction of the yoke, and a coil wound around the core. Includes (Coil). Since the structure of the drive motor 1320 is the same as that of a general BLDC motor, a detailed description thereof will be omitted.

The rotation shaft 1330 is installed to pass through the center of the motor rotor 1321 and is coupled to the pump rotor 1120. Accordingly, the rotation shaft 1330 rotates the pump rotor 1120 while rotating together as a current is applied to the motor stator 1322 and the motor rotor 1321 rotates. The support member 1340 is installed at an end portion of the motor housing 1310 on the side of the pump unit 1100 and is formed in a ring shape surrounding the protruding member 1130. At this time, the support member 1340 is disposed such that the inner circumferential surface is spaced apart from the outer circumferential surface of the protruding member 1130.

Some of the oil sucked into the pump housing 1110 by the pump rotor 1120 is through a gap formed between the rotation shaft 1330 and the inner wall of the pump housing 1110, the driving motor It is supplied to the (1320) side. More specifically, some of the oil sucked into the pump unit 1100 passes through the gap between the rotation shaft 1330 and the inner wall of the pump housing 1110, and then the rotation shaft 1330 and the protrusion. Passing through the gap between the inner circumferential surface of the member 1130, it is supplied to the drive motor 1320 side. The oil supplied to the driving motor 1320 circulates the driving motor 1320 through the space between the core and the core of the driving motor 1320, and then the support member 1340 and the protrusion member 1130 ) Is introduced into the discharge port 1112 through the gap and discharged to the outside. Accordingly, the motor unit 1300 is cooled by oil flowing into the inside and circulating, and does not suffer heat damage during driving.

3 and 4, the control unit 1200 includes a control housing 1210, a coupling member 1220, a control board 1230, control elements 1240 and 1241, and a connector 1250. The control housing 1210 accommodates the control board 1230, the control elements 1240 and 1241, and the connector 1250 therein, and is disposed to be spaced apart from the pump unit 1100. The control housing 1210 includes a control cover 1211 and a housing plate 1212. The control cover 1211 is disposed to be spaced apart from the pump housing 1110 and the control housing 1210 with the housing plate 1212 therebetween. The housing plate 1212 is disposed to face the pump housing 1110 and the control housing 1210, and the control plate 1230 is mounted. Since the control cover 1211 is disposed to cover the housing plate 1212 from the outside, the control plate 1230 is accommodated therein.

The coupling member 1220 is disposed between the control housing 1210 and the pump housing 1110, and couples the control housing 1210 to the pump housing 1110. The control plate 1230 is mounted on the housing plate 1212, and the control elements 1240 and 1241 and the connector 1250 are installed. The control elements 1240 and 1241 are installed on the control panel 1230 and receive current from the outside to control the motor unit 1300.

The control elements 1240 and 1241 include a first control element 1240 and a second control element 1241. The first control element 1240 indicates an amount of heat generated when a current is applied, which is equal to or greater than a preset reference value. The second control element 1241 indicates the amount of heat generated when current is applied is less than a preset reference value. The control elements 1240 and 1241 may be classified into the first control element 1240 and the second control element 1241 by comparing the maximum value of the amount of heat generated when current is applied with the preset reference value. However, it is not necessarily limited thereto.

Referring to FIG. 4, the coupling member 1220 is coupled to a portion of the pump housing 1110 between the motor unit 1300 and the discharge port 1112. More specifically, the coupling member 1220 is coupled to the outer side in the radial direction of the support member 1340. In addition, the first control element 1240 is disposed in a position adjacent to the coupling member 1220 of the control plate 1230.

Oil circulating inside the motor unit 1300 flows into the discharge port 1112 through the space between the support member 1340 and the protrusion member 1130. At this time, the first control element 1240 is disposed at a position adjacent to the coupling member 1220, the coupling member 1220 is disposed at a position adjacent to the support member 1340, and the support member ( Since 1340 is disposed at a position adjacent to the discharge port 1112, heat generated from the first control element 1240 passes through the coupling member 1220 and the support member 1340, and the motor unit 1300 ) To the oil flowing into the discharge port 1112. With this structure, the first control element 1240 is cooled.

According to the electric oil pump 1000 according to the present invention, some of the oil sucked by the pump unit 1100 is supplied to the motor unit 1300 and circulated, and the control element of the control unit 1200 ( The first control element 1240 with the largest calorific value among 1240 and 1241) is disposed adjacent to a portion where the control unit 1200 and the pump unit 1100 are coupled to each other, thereby controlling the first control using the sucked oil. The device 1240 may be cooled. Therefore, according to the electric oil pump 1000 according to the present invention, it is possible to effectively cool the first control element 1240 without separately supplying cooling water, and it is possible to reduce the number of parts and manufacturing cost of the product.

The connector 1250 is installed on the control plate 1230, penetrates through the coupling member 1220 and penetrates into the support member 1340 of the motor unit 1300. Further, the connector 1250 is electrically connected to the driving motor 1320 and transmits the control signals of the control elements 1240 and 1241 to the driving motor 1320. In this case, the first control element 1240 is disposed adjacent to the connector 1250. In this case, the connector 1250 is cooled by oil flowing from the motor unit 1300 to the discharge port 1112 through the space between the support member 1340 and the protrusion member 1130, and the The first control element 1240 disposed adjacent to the connector 1250 is also cooled. The second control element 1241 is disposed to be spaced apart from the connector 1250 with the first control element 1240 of the control panel 1230 therebetween.

The control cover 1211 may be formed of a plastic material, and the housing plate 1212 may be formed of a metal material such as aluminum. Referring to FIG. 2, a space is formed between the housing plate 1212 and the motor housing 1310. At this time, since the electric oil pump 1000 according to the present invention is installed in a vehicle, air flows between the housing plate 1212 and the motor housing 1310 when the vehicle is running. In this case, the housing plate 1212 may be cooled by air, and the control elements 1240 and 1241 mounted on the housing plate 1212 may also be cooled. Meanwhile, an insulating member (not shown) for electrical insulation may be separately disposed between the control plate 1230 and the housing plate 1212.

Therefore, according to the electric oil pump 1000 according to the present invention, even if cooling water is not separately supplied to the control unit 1200, the first control element 1240 can be cooled using the sucked oil, and the housing plate The first control element 1240 and the second control element 1240 may be effectively cooled by using air flowing between the 1212 and the motor housing 1310.

Referring to FIG. 4, the motor unit 1300 may further include an auxiliary housing 1350, a sealing wall 1351, a bearing 1352 and a sealing cap 1360. The auxiliary housing 1350 is formed on a surface of the motor housing 1310 opposite to the pump unit 1100. The sealing wall 1351 is formed to protrude upward from the auxiliary housing 1350. In this case, the sealing wall 1351 has a diameter smaller than that of the auxiliary housing 1350.

The bearing 1352 is inserted into the inner wall of the auxiliary housing 1350. At this time, the bearing 1352 has an outer diameter larger than an inner diameter of the auxiliary housing 1350. Accordingly, the bearing 1352 is inserted from the side where the driving motor 1320 is disposed to the auxiliary housing 1350 through a press-in method. Therefore, the bearing 1352 is rigidly fixed to the auxiliary housing 1350 without a separate fixing member.

The sealing cap 1360 is press-fitted from the outside of the sealing wall 1351 into the inside of the sealing wall 1351 to seal the inside of the auxiliary housing 1350. To this end, the sealing cap 1360 includes a sealing plate 1361, a sealing cylinder 1362, and a bent piece 1363. The sealing plate 1361 is disposed so as to cross the inside of the sealing wall 1351. The sealing cylinder 1362 is formed in a cylindrical shape, and is disposed such that an outer circumferential surface contacts the inner circumferential surface of the sealing wall 1351.

The outer diameter of the sealing cylinder 1362 may be formed larger than the inner diameter of the sealing wall 1351 so that the sealing cap 1361 can be inserted into the sealing wall 1351 through a press-fitting method. As the sealing cylinder 1362 is pressed into and inserted into the inner wall of the sealing wall 1351, the sealing cap 1360 seals the inside of the auxiliary housing 1350.

The bent piece 1363 is bent radially outward of the sealing cylinder 1362 from the upper end of the sealing cylinder 1362, and is seated on the upper end of the sealing wall 1352. By forming the bent piece 1363 on the upper side of the sealing cylinder 1362, the sealing cap 1360 does not move toward the auxiliary housing 1350 and maintains a state disposed inside the sealing wall 1351 Is done.

1000: electric oil pump 1100: pump unit
1200: control unit 1300: motor unit

Claims (7)

delete A pump unit that sucks and discharges oil from the outside;
A control unit disposed on one side of the pump unit and including a control housing, a coupling member for coupling the control housing to the pump unit, and a control element disposed inside the control housing; And
It is installed in the pump unit, and includes a motor unit through which some of the oil sucked by the pump unit circulates inside,
Among the control elements, the ones indicating the amount of heat generated above a preset reference value are disposed at a position adjacent to the coupling member,
The pump unit,
A pump housing having a discharge port discharged to the outside after the oil circulating in the motor unit flows in,
It is accommodated in the inside of the pump housing, and includes a pump rotor for sucking and discharging oil from the outside through rotation,
The coupling member is an electric oil pump coupled to a portion of the pump housing between the motor unit and the discharge port. The method according to claim 2,
The control unit,
A control plate on which the control element is mounted,
It is installed on the control plate, further comprises a connector that is inserted into the motor through the coupling member,
An electric oil pump disposed in a position adjacent to the connector indicates that the amount of heat generated by the control element is more than a preset reference value. A pump unit that sucks and discharges oil from the outside;
A control unit disposed on one side of the pump unit and including a control housing, a coupling member for coupling the control housing to the pump unit, and a control element disposed inside the control housing; And
It is installed in the pump unit, and includes a motor unit through which some of the oil sucked by the pump unit circulates inside,
Among the control elements, the ones indicating the amount of heat generated above a preset reference value are disposed at a position adjacent to the coupling member,
The pump unit,
A pump housing with an oil discharge port,
It includes a pump rotor accommodated in the inside of the pump housing,
The motor unit,
Motor housing,
A driving motor installed inside the motor housing,
An electric motor including a rotation shaft coupled to the drive motor, coupled to the pump rotor through the pump housing, and supplied to the drive motor side through the oil sucked by the pump rotor between the inner wall of the pump housing Oil pump. The method of claim 4,
The pump unit,
Further comprising a protruding member protruding from the pump housing toward the motor unit and surrounding the rotating shaft,
The motor unit,
It is installed at the end of the pump unit side of the motor housing, is formed in a ring shape surrounding the protruding member, the oil circulating the motor unit further comprises a support member flowing into the discharge port through the space between the protrusion member, ,
The coupling member is an electric oil pump disposed radially outside the support member. The method of claim 4,
The motor unit,
An auxiliary housing formed on a surface of the motor housing opposite to the pump unit,
An electric oil pump that is press-fit into the auxiliary housing and further comprises a bearing rotatably supporting the rotating shaft. The method of claim 6,
The motor unit,
A sealing wall protruding upward from the auxiliary housing;
The electric oil pump further comprising a sealing cap that is press-fit into the inside of the sealing wall to seal the inside of the auxiliary housing.

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