KR102387710B1 - Electric oil pump - Google Patents

Abstract

It relates to an electric oil pump, comprising: a housing forming an outer shape; a pump installed in the housing; a motor for driving the oil pump; and a controller housing in which a controller for controlling the driving of the motor is installed, the housing having the suction oil By providing a configuration in which a transmission flow path for cooling the motor is formed by transferring a portion of the .

Description

Electric oil pump {ELECTRIC OIL PUMP}

The present invention relates to an electric oil pump, and more particularly, to an electric oil pump applied to a transmission of a hybrid vehicle.

In general, a hybrid vehicle (Hybrid Electric Vehicle) refers to driving a vehicle by efficiently combining two or more different types of power sources, and in most cases, an engine that uses fuel to obtain driving power and an electric motor driven by battery power It refers to a vehicle that obtains driving power by

Recently, in response to the demands of the times for improving fuel efficiency and developing more eco-friendly products, research on hybrid vehicles is being conducted more actively.

A hybrid vehicle is basically a vehicle having an engine, a motor, a vehicle battery, and a high voltage battery. Recently, the capacity of the high voltage battery has been made larger than that of the conventional hybrid vehicle, and the high voltage battery is charged from an external power source, so that only the EV mode is used for short-distance driving. A plug-in hybrid vehicle that drives and runs in HEV mode when the high voltage battery is discharged is being developed.

The plug-in hybrid vehicle (PHEV) is equipped with a gasoline-powered internal combustion engine engine and a battery engine at the same time as in a conventional hybrid vehicle, and drives the vehicle using one or both of them, and has a large capacity. As a vehicle that can be charged with electricity by installing a high-voltage battery of

The present applicant has disclosed and registered the oil pump driving device technology for hybrid and plug-in hybrid vehicles in many such as Patent Document 1 and Patent Document 2 below.

Republic of Korea Patent Registration No. 10-1044228 (Announced on June 27, 2011) Republic of Korea Patent Registration No. 10-1307911 (Announced on September 13, 2013)

Meanwhile, a BLDC motor is applied to an oil pump for a hybrid vehicle according to the prior art. The BLDC motor has linear torque-to-current and speed-to-voltage characteristics, no mechanical/electrical noise, easy acceleration/deceleration control, and a very high torque-to-inertia ratio, making it possible to produce high output in a compact size. .

At the same time, the oil pump for a hybrid vehicle according to the prior art has an air-cooling structure for cooling by supplying air to the motor and the pump body provided as a separate type when the oil pump is driven, and the controller and the motor for controlling the operation of the oil pump are separately formed. It was constructed in a structure that was prepared and attached directly.

For this reason, the oil pump for a hybrid vehicle according to the prior art has a problem in that the controller is thermally damaged and malfunctions due to heat generated when the oil pump is driven.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric oil pump capable of reducing vehicle weight and securing space by integrating an oil pump applied to a transmission of a hybrid vehicle and a controller. .

Another object of the present invention is to provide an electric oil pump capable of effectively cooling heat generated when the oil pump is driven.

Another object of the present invention is to provide an electric oil pump capable of preventing thermal damage to the controller by blocking heat generated in the oil pump from being transferred to the controller.

In order to achieve the above object, the electric oil pump according to the present invention includes a housing forming an outer shape, a pump installed inside the housing, a motor for driving the oil pump, and a controller in which a controller for controlling the driving of the motor is installed It includes a housing, and the housing is characterized in that a transmission passage for cooling the motor by transferring a part of the suctioned oil to the motor is formed.

In addition, in order to achieve the above object, the electric oil pump according to the present invention includes a housing in which a pump and a motor for driving the oil pump are installed, a housing mounted on a transmission, and a controller housing coupled to the upper end of the housing, , An air layer for blocking heat transfer is formed between the housing and the controller housing.

As described above, according to the electric oil pump according to the present invention, when the oil pump is driven, some of the oil sucked into the housing is transferred to the motor to cool the motor in an oil-cooling manner.

And, according to the present invention, an air layer is formed between the housing of the oil pump and the controller housing to prevent heat generated from the motor from being transferred to the controller.

Accordingly, according to the present invention, it is possible to maximize the cooling effect of the electric oil pump and prevent heat generated from the oil pump from being transferred to the controller, thereby preventing thermal damage and malfunction of the controller.

In addition, according to the present invention, by integrating the pump housing and the motor housing in which the pump and the motor are installed and installing them in one housing, the structure of the electric oil pump is simplified and the workability during manufacturing operation can be improved. is obtained

1 is a perspective view of an electric oil pump according to a preferred embodiment of the present invention;
2 is a perspective view of the electric oil pump shown in FIG. 1 from another angle;
3 is an exploded perspective view of the electric oil pump shown in FIG. 1;
4 is a cross-sectional view taken along line AA' shown in FIG. 1;
5 is a cross-sectional view taken along the line B-B' shown in FIG. 1;
6 is a bottom view of the housing;

Hereinafter, an electric oil pump according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, it will be described using an electric oil pump applied to a gasoline vehicle. Of course, it should be noted that the present invention can be applied not only to gasoline vehicles, but also to LPG vehicles, diesel vehicles, hybrid and plug-in hybrid vehicles.

In the following, the installation position of the electric oil pump will be described without distinguishing, but the present invention may be applied to both a built-in oil pump installed inside the oil pan and an external oil pump installed outside the oil pan.

In addition, the pump is provided as a gerotor pump including an internal gear and an external gear having different numbers of meshing teeth, and the motor for driving the oil pump (hereinafter abbreviated as 'motor') is a 3-phase BLDC motor or 3-phase BLAC motor. can be provided.

1 is a perspective view of an electric oil pump according to a preferred embodiment of the present invention, FIG. 2 is a perspective view of the electric oil pump shown in FIG. 1 from another angle, and FIG. 3 is an exploded view of the electric oil pump shown in FIG. is a perspective view. 4 is a cross-sectional view taken along line A-A' shown in FIG. 1, FIG. 5 is a cross-sectional view taken along line B-B' shown in FIG. 1, and FIG. 6 is a bottom view of the housing. 6 shows the lower surface of the housing from which the lower cover and the pump are removed.

Hereinafter, terms indicating a direction such as 'left', 'right', 'front', 'rear', 'up' and 'downward' are defined as indicating each direction based on the state shown in each figure. do.

As shown in FIGS. 1 to 4, the electric oil pump 10 according to a preferred embodiment of the present invention includes a pump 30 and an oil pump driving motor (hereinafter abbreviated as 'motor') 40 therein. is installed and includes a housing 20 mounted on the transmission and a controller housing 20 coupled to the upper portion of the housing 20 .

The motor 40 may be provided as a three-phase BLDC motor or a three-phase BLAC motor.

However, in the present invention, the BLAC motor is applied instead of the BLDC motor, and the Hall sensor and the three-phase pump driving wire are removed to control the driving of the oil pump motor in a sensorless control method. Therefore, the present invention reduces the manufacturing cost of the oil pump and the oil pump motor control device, and increases the efficiency of the oil pump while maintaining the performance and responsiveness of the oil pump to which the conventional BLDC motor is applied at the same level, and the DC current The effect of improving the fuel efficiency of the hybrid vehicle is obtained by reducing the

The housing 20 is a portion forming the outer shape of the electric oil pump, and may be formed in a substantially cylindrical shape with upper and lower surfaces open.

In the inner space of the housing 20, the pump 30 and the motor 40 are installed, and at the upper and lower ends of the housing 20, an upper cover 21 for shielding the upper and lower surfaces of the opened housing 20, respectively, and The lower cover 22 may be coupled.

As described above, according to the present invention, the pump housing and the motor housing in which the pump and the motor are installed are integrated and installed in one housing, thereby simplifying the structure of the electric oil pump and improving workability during manufacturing operation.

A movement path through which oil moves is formed in the housing 20 , and a flange 23 mounted on the transmission may be provided at one lower side of the housing 20 .

A suction port 231 sucked into the housing 20 and a discharge port 232 through which the oil pumped by the pump 30 is discharged may be formed in the flange 23 .

A nipple is coupled to each of the suction port 231 and the discharge port 232 , and an O-ring for preventing separation of the nipple may be additionally installed.

As shown in FIG. 3 , the moving flow path includes a suction flow path 24 for supplying oil sucked through the suction port 231 to the motor side, and a discharge flow path for discharging oil pumped by the rotational force of the pump toward the discharge port 232 side. (25) may be included.

In addition, the housing 10 may be provided with a drain passage 26 for transferring the oil pumped by the pumping operation of the pump 30 to the discharge passage 25 .

In order to reduce the weight of the housing 20 and improve workability by increasing workability in the manufacturing process, the discharge passage 25 includes a drain passage 26 formed in the center of the housing 10 as shown in FIG. 5 . It may be provided in a slanted structure inclined by a predetermined angle with the suction passage 24 to the center.

In addition, the drain passage 26 is provided in the central portion of the housing 20, and as shown in FIG. 6 , inclined toward the inner end of the discharge passage 25 formed in the upper portion from the pump 30 located at the lower portion. Pairs can be formed. An inner end of the suction passage 24 may be connected to one side of the drain passage 26 .

Therefore, in the present embodiment, the suction passage 24 and the drain passage 26 can be connected in a simple structure without forming a separate drain hole in the pump housing 20 .

On the other hand, in the present embodiment, an oil-cooling structure for cooling the heat generated when the motor 40 is driven using oil is applied.

That is, in the housing 20 , the transfer passage 27 for transferring fuel sucked through the suction passage 24 to the upper end of the modular motor 40 and the oil heat-exchanged in the motor 40 are transferred to the pump 30 side. A recovery passage 28 for recovery is formed.

The transmission passage 27 may be formed to extend along one side wall of the housing 10 , that is, inside the side wall connected to the flange 23 in the vertical direction. A lower end of the transmission passage 27 may be connected to the suction passage 24 , and an upper end of the transmission passage 27 may be disposed above the motor.

Accordingly, a portion of the oil sucked into the housing 10 through the suction port 231 is transmitted to the upper portion of the motor 40 through the transmission passage 27 , and between the inner circumferential surface of the housing 10 and the outer surface of the motor 40 . It absorbs heat through heat exchange with the motor 40 and the housing 10 while moving downward along the space, and cools the motor 40 and the housing 10 . The oil whose temperature has risen through this process is recovered to the pump 30 side through the recovery passage 28 .

As described above, the present invention can effectively cool the heat generated when the motor is driven in an oil cooling method using oil by applying a flow path structure in which oil moves inside the housing of the electric oil pump.

Accordingly, the present invention can prevent thermal damage and malfunction of the electric oil pump by increasing the cooling efficiency of the electric oil pump.

1 to 4 again, the lower surface of the controller housing 50 is formed in a substantially rectangular parallelepiped shape, and the controller cover 51 may be coupled to the lower surface of the controller housing 50 .

A PCB assembly 53 on which circuit components such as the controller 52 and the motor driving means are mounted may be disposed inside the controller housing 50 .

The controller housing 50 is provided with a signal connector 54 receiving a control signal from the vehicle's main control unit (not shown) and a high voltage power supply connector 55 receiving power from the vehicle's high voltage battery (not shown). can be

In addition, a plurality of cooling fins 56 for dissipating heat generated inside the controller housing 50 to the outside may be provided at the upper end of the controller housing 50 .

A thermal pad 57 may be installed on the upper surfaces of the controller 52 and the motor driving means to effectively transfer heat generated during driving to the plurality of cooling fins 56 .

In addition, in this embodiment, an air layer L is provided between the housing 20 and the controller housing 50 in order to prevent heat generated from the oil pump from being transferred to the controller.

That is, the upper cover 21 coupled to the upper surface of the housing 20 and the controller cover 51 coupled to the lower surface of the controller housing 50 are spaced apart from each other by a preset interval, and use a plurality of fastening bolts to can be combined.

Here, the three-phase terminal 41 connected to the motor 40 is installed on the upper cover 21 to protrude upward, and the three-phase terminal 41 penetrates the controller cover 51 to form the PCB assembly 53 and electrically connected.

As described above, according to the present invention, as the air layer is formed between the housing and the controller housing, heat generated when the oil pump, particularly the motor is driven, and the heat of the oil heat-exchanged with the motor are prevented from being transferred to the controller.

Next, the coupling relationship and operation method of the electric oil pump according to a preferred embodiment of the present invention will be described in detail.

First, the operator arranges the pump 30 and the motor 40 on the lower part and the upper part of the housing 20, respectively, moves the pump 30 and the motor 40 upward and downward, respectively, and inserts them into the housing, The rotation shaft of the motor 40 and the pump 30 are coupled.

At this time, the housing 20 sucks the oil, and supplies a part of the sucked oil to the motor 40 side for cooling, the delivery passage 27 and the recovery passage 28 , and the remaining oil to the pump 30 . The suction flow path 24, the drain flow path 26, and the discharge flow path 25 for pumping and discharging the oil pumped at a preset pressure are formed.

And the operator completes the assembly of the housing 20 of the electric oil pump 10 by coupling the upper cover 21 and the lower cover 22 to the upper and lower surfaces of the housing 20, respectively.

Then, the operator couples the controller housing 50 to the upper portion of the housing 20 .

At this time, the controller cover 51 is coupled to the opened lower surface of the controller housing 50, and the upper cover 21 and the controller cover 51 coupled to the housing 20 are spaced apart by a preset interval. are combined

Therefore, as the air layer L is formed between the housing 20 and the controller housing 50 , the heat of the housing 20 is insulated from being transferred to the controller housing 50 .

At this time, the heat generated by the controller 52 installed inside the controller housing 50 and the motor driving means is transferred to the plurality of cooling fins 56 formed on the upper surface of the controller housing 50 through the heat theft pad 57 installed on the upper surface. and is cooled through heat exchange with external air through a plurality of cooling fins 56 .

Through the process as described above, according to the present invention, when the oil pump is driven, some of the oil sucked into the housing is transferred to the motor to cool the motor in an oil-cooling manner.

Also, according to the present invention, an air layer is formed between the housing of the oil pump and the controller housing to prevent heat generated from the motor from being transferred to the controller.

Accordingly, the present invention maximizes the cooling effect of the electric oil pump and blocks heat generated in the oil pump from being transferred to the controller, thereby preventing thermal damage and malfunction of the controller.

In addition, according to the present invention, by integrating the pump housing in which the pump and the motor are installed, and the motor housing in one housing, the structure of the electric oil pump can be simplified to improve workability during manufacturing operation.

Although the invention made by the present inventors has been described in detail according to the above embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.

The present invention is applied to an electric oil pump technology that cools the motor in an oil-cooling manner by transferring some of the oil sucked into the housing to the motor when the oil pump is driven.

10: electric oil pump
20: housing
21: upper cover 22: lower cover
23: flange 231: inlet
232: discharge port 24: suction flow path
25: discharge passage 26: drain passage
27: delivery flow path 28: return flow path
30: pump
40: motor for driving oil pump 41: 3-phase terminal
50: controller housing 51: controller cover
52: controller 53: PCB assembly
54: signal connector 55: high voltage power connector
56: cooling fins 57: heat conduction pad
L: air layer

Claims (8)

a housing forming an outline,
a motor for driving a pump and an oil pump installed inside the housing; and
and a controller housing in which a controller for controlling the driving of the motor is installed,
A transmission flow path for cooling the motor by transferring a part of the suctioned oil to the motor is formed in the housing,
An air layer for blocking heat transfer is formed between the housing and the controller housing. delete According to claim 1,
The electric oil pump, characterized in that the housing further includes a recovery line for recovering the heat-exchanged oil transferred to the motor through the transmission passage to the pump side. According to claim 1,
One end of the delivery passage is connected to a suction passage for sucking oil into the housing,
The electric oil pump, characterized in that it extends to an upper portion of the motor through one side wall of the housing. delete 5. The method of any one of claims 1, 3 and 4,
An upper cover and a lower cover are respectively coupled to the opened upper and lower surfaces of the housing,
A controller cover is coupled to the opened lower surface of the controller housing,
The electric oil pump, characterized in that the upper cover and the controller cover are coupled to be spaced apart by a preset interval so as to form the air layer. 7. The method of claim 6,
A PCB assembly on which a controller and a motor driving means are mounted is installed inside the controller housing,
The motor and the PCB assembly are electrically connected by a three-phase terminal coupled through the upper cover. 8. The method of claim 7,
A plurality of cooling fins are formed on the upper surface of the controller housing,
The electric oil pump characterized in that a heat conduction pad for transferring heat generated during driving to the plurality of cooling fins is installed on upper surfaces of the controller and the motor driving means.

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