KR102177683B1 - Electronic Oil Pump - Google Patents

Abstract

The present invention relates to an electric oil pump comprising: a motor module including a motor housing and a rotary shaft which rotates to provide driving power by applied power; and a pump module which rotates by the torque of the rotary shaft, has an inlet into which fluid is introduced and an outlet through which the fluid of the inlet is compressed to be discharged, includes a pump housing coupled to the motor module, and has an inner rotor coupled to the rotary shaft to rotate and an outer rotor coupled to the inner rotor. The rotary shaft and the inner rotor are coupled by a Woodruff key. One side of the rotary shaft is supported by a bush coupled to the motor housing, and the other side of the rotary shaft is supported by a bush coupled to the pump housing. The coupling structure of the rotary shaft and the rotor and the structure for supporting the rotary shaft are sturdy to be applied to a high pressure acting on an oil pump of a relatively high pressure, and the electric oil pump can reduce the driving torque of a motor.

Description

Electric Oil Pump {Electronic Oil Pump}

The present invention relates to an electric oil pump, and more specifically, a structure by applying a coupling structure between a shaft and a rotor, a structure supporting the shaft, an effective arrangement and heat dissipation structure of a control unit, and a backflow prevention structure when a relatively high pressure is applied. It relates to an improved electric oil pump.

In general, oil is supplied to the engine, transmission, steering system, transmission, etc. of a vehicle, and a pump is used as a means of supplying such oil.

These pumps include vane pumps and gear pumps.

The present invention relates to, for example, an oil pump mounted in an automatic transmission, and is configured such that an external gear of an inner rotor is meshed with an internal gear of an eccentric outer rotor, so that the inner rotor rotates and drives the inner rotor and the outer rotor. The space of the suction part is enlarged at the suction part to suck the hydraulic oil, and decrease toward the discharge port to discharge the sucked hydraulic oil.

Such an electric oil pump for a transmission requires a somewhat higher high pressure than an oil pump for a steering device.

When such a high pressure is applied, more force acts on the rotor, shaft, etc. than in the case of low pressure, and if it is not supported firmly, sudden vibration and shaking are caused.

In addition, in order to control the pump more precisely, various kinds of electromagnetic components, including PCBs, are applied to the electric oil pump, and these electromagnetic components should be more efficiently placed inside the minimum space, and heat generated from the electromagnetic components should be effectively removed. It is desirable that it can be released to the outside.

[references]

Unexamined Patent Publication No. 10-2017-0014543 (published on Feb. 08, 2017)

Registered Patent Publication No. 10-1204148 (announced on November 16, 2012)

It is an object of the present invention to provide an electric oil pump capable of reducing the driving torque of a motor while strengthening the coupling structure between a rotating shaft and a rotor and a structure supporting the rotating shaft so that it can be applied to a high pressure acting on a relatively high pressure oil pump. will be.

In addition, another object of the present invention is to efficiently minimize space in order to package the electromagnetic component for communication between the oil pump and the transmission to which the pressure of the oil pump is provided and the electromagnetic component for driving the motor in the oil pump. It is to provide an electric oil pump capable of effectively discharging the heat generated by utilizing and discharging the generated heat to the outside and suppressing noise.

In addition, another object of the present invention is to provide an electric oil pump capable of minimizing friction between a rotating shaft and a bush surface supporting the rotating shaft and preventing reverse flow of high pressure when the pump is stopped.

An object of the present invention is to provide an electric oil pump, comprising: a motor housing and a motor module having a rotating shaft that rotates to provide driving force by an applied power source; An inner rotor that rotates by the rotational force of the rotating shaft and has an inlet through which fluid is introduced and a discharge port through which fluid is discharged by pressurizing the fluid in the inlet, and has a pump housing coupled to the motor module, and rotates by being coupled with the rotating shaft. A pump module having an outer rotor coupled to the inner rotor; including, wherein the rotation shaft and the inner rotor are coupled by a vandal key, and one side of the rotation shaft is coupled to the bush coupled to the motor housing and the other side is coupled to the pump housing. It is achieved by an electric oil pump, characterized in that it is supported by the bush.

In addition, a check valve is included in the discharge port, and the check valve includes a body body, a ball seat formed in a body body having a cross-sectional area equal to or greater than that of the discharge port, a ball provided to open and close the ball seat, and the ball It is preferable to include a pin coupled to the body body so as to be movable between the set positions.

In addition, it is preferable that the bush includes a bush groove formed in a spiral shape so that the oil between the inner rotor and the outer rotor flows into the bush side according to the rotation of the rotation shaft on a surface in contact with the rotation shaft.

On the other hand, an object of the present invention is an electric oil pump, comprising: a motor housing and a motor module having a rotation shaft that rotates to provide a driving force by an applied power source; An inner rotor that rotates by the rotational force of the rotating shaft and has an inlet through which fluid is introduced and a discharge port through which fluid is discharged by pressurizing the fluid in the inlet, and has a pump housing coupled to the motor module, and rotates by being coupled with the rotating shaft. A pump module having an outer rotor coupled to the inner rotor; A control housing and a control module for controlling driving of the motor module in the control housing and accommodating a configuration configured to communicate with a central control unit; including, but an upper control panel for controlling communication with a lower control panel for controlling the motor module This is also achieved by an electric oil pump, characterized in that the vertically separated arrangement.

In addition, it is preferable that a high-height condenser is disposed on the lower control panel, and the upper control panel is separated from the lower control panel by a set height avoiding a space and coupled to the control housing.

In addition, it is preferable that the PCB, the capacitor, etc. are disposed on the upper side of the lower control panel, and the FET is disposed on the lower side.

In addition, it is preferable that the rotation shaft and the inner rotor are coupled by a vandal key, and one side of the rotation shaft is supported by a bush coupled to the motor housing and the other side by a bush coupled to the pump housing.

Accordingly, it is possible to provide an electric oil pump capable of reducing a driving torque of a motor while strengthening the coupling structure between the rotation shaft and the rotor and the structure supporting the rotation shaft so as to be applied to a high pressure acting on a relatively high pressure oil pump.

In addition, in order to package the electromagnetic components for communication between the oil pump and the transmission provided with the pressure of the oil pump, and the electromagnetic components for driving the motor, the minimum space is efficiently utilized and the generated heat is removed from the outside. It is possible to provide an electric oil pump capable of effectively discharging and suppressing noise.

In addition, it is possible to provide an electric oil pump capable of minimizing friction between the rotating shaft and the bush surface supporting the rotating shaft and preventing high pressure from flowing backward when the pump is stopped.

1 is a perspective view of an electric oil pump according to an embodiment of the present invention,
Figure 2 is an exploded perspective view of Figure 1,
3A to 3C are a front cross-sectional view, a flat cross-sectional view, and a conceptual view of the control unit,
4 is a cross-sectional view and a perspective view for explaining the coupling of the inner rotor and the bush in the rotation shaft and the pump module according to the present invention,
5 is a cross-sectional view and a perspective view for explaining the coupling of the inner rotor and the bush in the rotation shaft and the pump module according to the prior art;
6 is a plan view and a perspective view of the bush,
7 is a cross-sectional view for explaining the operation state of the check valve.

For example, an electric oil pump 100 for supplying a high-pressure fluid to a transmission of a vehicle according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7.

1 is a perspective view of an electric oil pump according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, FIGS. 3A to 3C are a front cross-sectional view, a top cross-sectional view, and a conceptual view of a control unit, and FIG. 4 is the present invention. A cross-sectional view and a perspective view for explaining the combination of the rotation shaft and the inner rotor and the bush in the rotation shaft and the pump module according to the prior art, and FIG. 5 is a description of the combination of the rotation shaft and the inner rotor and the bush in the rotation shaft and pump module according to the prior art It is a cross-sectional view and a perspective view for essential parts, FIG. 6 is a plan view and a perspective view of a bush, and FIG. 7 is a cross-sectional view for explaining an operating state of a check valve.

Hereinafter, while describing the configuration of the oil pump 100 according to the present invention, the position of each component is relatively described and expressed as a lower side, an upper side, etc. is based on FIG. 2 for convenience of description.

The oil pump 100 according to the present invention is a motor module having a motor housing 1310 and a rotation shaft 1330 that rotates to provide a driving force by an applied power source, as shown in FIGS. 1 to 7. (1300) and; A pump housing that rotates by the rotational force of the rotation shaft 1330 and has an inlet 1131 through which fluid is introduced and a discharge port 1133 through which the fluid in the inlet 1131 is pressurized and discharged, and is coupled to the motor module 1300 A pump module 1100 having an inner rotor 1121 and an outer rotor 1123 coupled to the inner rotor 1121 and coupled to the rotation shaft 1330 and coupled to the rotary shaft 1330, including; The rotation shaft 1330 and the inner rotor 1121 are coupled by a vandal key 1340, and one side of the rotation shaft 1330 is a bush 1140 coupled to the motor housing 1310 and the other side is the pump housing ( It is preferably supported by the bush 1140 coupled to 1110).

The oil pump 100 includes a control housing 1510 and a control module 1500 that controls driving of the motor module 1300 in the control housing 1510 and accommodates a configuration provided to communicate with a central control unit. It is preferable to further provide.

The pump module 1100 includes a pump housing 1110 for accommodating and supporting parts forming and constituting the exterior, and an inner rotor 1121 and an inner rotor that is accommodated in the pump housing 1110 and rotated by being coupled to the rotation shaft 1330. An outer rotor 1123 that rotates coupled with the rotor 1121, a suction port 1131 and a discharge port 1133 formed through the pump housing 1110 to allow fluid to flow in and discharge, and a motor module provided in the discharge port 1133 When the rotation of the 1300 is stopped, a check valve 1150 for preventing a high pressure from flowing backward to the pump module 1100 and a bush 1140 for supporting the rotation shaft 1330 are provided.

The inner rotor 1121 and the outer rotor 1123 are eccentric to each other in a gear shape and have a structure that meshes and rotates.

A rotary shaft 1330 is coupled to the inner through hole (not shown) of the inner rotor 1121 and fixed by the rotary shaft 1330 and the vandal key 1340, and a rotor key groove inside the inner rotor so that the vandal key 1340 is coupled. 1121a) is formed.

In the bush 1140, as shown in FIG. 6, a bush groove 1143 is formed which is recessed in the inner surface so that the oil capable of lubricating and cooling may move in the process of rotating in contact with the rotating shaft 1330. have.

The bush groove 1143 is formed in an oblique line so that oil from the inner rotor 1121 and the outer rotor 1123 flows into the bush 1140 side, and when the rotation shaft 1330 rotates, the outer rotor 1123 and the inner rotor 1121 ) Side oil can be introduced, more effective lubrication or cooling can be achieved.

By minimizing the lubrication or friction force between the rotating shaft 1330 and the bush 1140 supporting the same, vibration and shaking of the rotating shaft 1330 rotating at high speed can be minimized, and frictional force can also be minimized, thereby reducing driving torque. This reduction in drive torque can reduce the current consumption.

The check valve 1150 is defective on the inlet 1131 side as shown in FIGS. 1, 2 and 7. The check valve 1150 is capable of opening and closing the body body 1151, the ball seat 1155 formed in the body body 1151 having a cross-sectional area equal to or greater than that of the discharge port 1133, and the ball seat 1155. It consists of a provided ball 1153 and a pin 1157 coupled to the body body 1151 so as to limit the movement between the set position of the ball 1153.

This structure has the advantage that the structure is simple because it does not include a configuration such as a spring as in the conventional check valve 1150.

When the motor module 1300 stops rotating the motor because it discharges high-pressure oil through the discharge port 1133 while the motor rotates, the check valve 1150 may prevent the high-pressure oil from the discharge port 1133 from flowing backward. That is, in the absence of the check valve 1150, when the motor is stopped, high-pressure oil flows into the pump module 1100 and reverse rotation of the motor (not shown), thereby reducing the risk of damage to the parts of the control module 1500. 1150) can be prevented.

7(a) shows that when the motor is stopped, the high-pressure fluid at the discharge port 1133 pushes the ball 1153 toward the ball seat 1155 (see arrow'A' in FIG. 7(a)) It is shown that the high pressure fluid from the 1133) side does not flow into the inner rotor 1121 and the outer rotor 1123.

On the other hand, Fig. 7(b) shows that the motor is operated so that the high pressure fluid pressurized between the inner rotor 1121 and the outer rotor 1123 pushes the ball 1153 coupled to the ball seat 1155 (Fig. 7 ( See arrow'B' in b)) It shows a state in which a high-pressure fluid is discharged, and the ball 1153 is limited in movement by the pin 1157.

Meanwhile, the rotation shaft 1330 according to the present invention is coupled by the inner rotor 1121 and the vandal key 1340 as shown in FIG. 4 as described above.

In the electric vacuum pump 2000 according to the prior art as shown in FIG. 5, the rotation shaft 2330 has a spline-shaped protrusion 2350, and a protrusion groove 2121a is formed in the inner rotor 2121 corresponding thereto. Has been. This conventional coupling structure of the rotary shaft 2330 and the inner rotor 2121 is a structure suitable for use at a low pressure of about 6 bar at the same size. In addition, in the prior art, since the rotation shaft 2330 is formed in a spline shape and a plurality of protrusions 2350 are formed on the rotation shaft 2330, the die casting operation is also complicated and it is not easy to perform a precise polishing operation.

5 is an electric vacuum pump 2000 according to the prior art, and reference numbers that are not specifically described are different from the reference numbers according to the present invention only by'thousand' units, and the reference numbers of hundreds, tens and ones are the same. Detailed description of the same configuration as in the present invention has been omitted.

That is, the present invention is not used for a low pressure of about 6 bar of the prior art, but is applied to a high pressure of about 15 bar, so that the rotary shaft 1330 and the inner rotor 1121 are more effectively fixed and the rotary shaft 1330 is not eccentric or shaken by the high pressure. The bush 1140 coupled to the pump housing 1110 on the upper side of the inner rotor 1121 and the bush 1140 coupled to the motor housing 1310 on the lower side of the inner rotor 1121 are coupled to the rotation shaft 1330 Since the rotation shaft 1330 can be firmly supported, the rotation shaft 1330 can be supported with a stabilizer even at high pressure generated while being eccentric and rotating.

The assembly sequence of this rotation shaft 1330 is to combine the vandal key 1340 to the rotation shaft 1330 and then the inner rotor 1121 and the outer rotor 1123 in this order, and then the pump housing 1110 and the pump housing 1110 ) Is coupled to the motor housing 1310 through a fastening means including a bolt not shown.

The control module 1500, as shown in FIGS. 2 to 3C, includes a control housing 1510, an upper control panel 1521 for controlling communication including CAN communication with an upper control unit including a central control unit, not shown, A lower control panel 1523 in charge of controlling the power and motor module 1300, a condenser 1531, a heat sink 1533 including an aluminum plate for dissipating heat, a head pin 1535, and the amount of heat generated FET 1537, which is a kind of many transistors, a housing cover 1540 that seals the lower side of the control housing 1510, and a connector provided to be easily connected and disconnected through a connector electrically and in communication with the outside of the oil pump 100 It is preferable that it consists of a part 1550.

The upper control panel 1521 mainly includes elements for CAN signal data, and the lower control panel 1523 includes elements for driving a power supply and a motor. Each of the control panels 1521 and 1523 may be provided with a PCB for each control, and an element including a basic resistor may be provided.

In particular, a large-sized condenser 1531 is disposed in the lower control panel 1523, and the upper control panel 1521 is not disposed above the condenser 1531, so that the height of the control module 1500 can be minimized. And space utilization can be increased.

That is, as shown in Figs. 3(a) and 3(b), since the condenser 1531 is disposed at a height (refer to'H2' in Fig. 3(a)), avoid the area where the high condenser 1531 is disposed. The control panel 1521 is spaced apart from the lower end of the housing cover 1540 by a height of'H1' by a distance of'L1' from the control housing 1510 (see Fig. 3(b)) It is coupled to the control housing 1510.

Meanwhile, under the lower control panel 1523, the FET 1537, which generates the most heat among the elements, is arranged so that the heat generated does not flow into the inner space where there are many elements, but is transferred to the housing cover 1540 to facilitate heat to the outside. Allowed to be released.

In order to firmly fix the upper control panel 1521 and the lower control panel 1523 by the vibration of the vehicle, a structure in which bolts are used (injection fusion) is adopted.

In addition, it is possible to suppress noise that may occur when the upper control panel 1521 and the lower control panel 1523 are divided and elements are disposed together.

Accordingly, according to the present invention, it is possible to provide an electric oil pump capable of reducing the driving torque of the motor while strengthening the coupling structure between the rotating shaft and the rotor and the structure supporting the rotating shaft so that it can be applied to a high pressure acting on a relatively high pressure oil pump. can do.

In addition, in order to package the electromagnetic components for communication between the oil pump and the transmission provided with the pressure of the oil pump, and the electromagnetic components for driving the motor, the minimum space is efficiently utilized and the generated heat is removed from the outside. It is possible to provide an electric oil pump capable of effectively discharging and suppressing noise.

In addition, it is possible to provide an electric oil pump capable of minimizing friction between the rotating shaft and the bush surface supporting the rotating shaft and preventing high pressure from flowing backward when the pump is stopped.

Here, although several embodiments of the present invention have been illustrated and described, those skilled in the art to which the present invention pertains will be able to see that the present embodiments can be modified without departing from the principles or spirit of the present invention. will be. The scope of the invention will be determined by the appended claims and their equivalents.

1000: electric oil pump 1100: pump module
1110: pump housing 1121: inner rotor
1121a: rotor key groove 1123: outer rotor
1131: suction port 1133: discharge port
1140: bush 1143: bush groove
1150: check valve 1151: body body
1153: check ball 1155: ball seat
1157: pin
1300: motor module 1310: motor housing
1330: rotating shaft 1333: keyway
1340: Vandal Key
1500: control module 1510: control housing
1521: upper control panel 1523: lower control panel
1531: condenser 1533: heat sink
1535: head pin 1537: FET
1540: housing cover 1550: connector

Claims (7)

In the electric oil pump,
A motor module including a motor housing and a rotation shaft that rotates to provide a driving force by the applied power;
An inner rotor that rotates by the rotational force of the rotating shaft and has an inlet through which fluid is introduced and a discharge port through which fluid is discharged by pressurizing the fluid in the inlet, and has a pump housing coupled to the motor module, and rotates by being coupled with the rotating shaft. Including; a pump module having an outer rotor coupled to the inner rotor,
The rotation shaft and the inner rotor are coupled by a vandal key, and one side of the rotation shaft is supported by a bush coupled to the motor housing and the other side by a bush coupled to the pump housing,
The bush is an electric oil pump, characterized in that it comprises a bush groove formed in a spiral shape so that the oil between the inner rotor and the outer rotor flows into the bush side according to the rotation of the rotation shaft on a surface in contact with the rotation shaft. The method of claim 1,
A check valve is included in the discharge port,
The check valve may include a body body, a ball seat formed in a body body having a cross-sectional area equal to or greater than the discharge port, a ball provided to open and close the ball seat, and the ball so as to be movable between a set position. Electric oil pump, characterized in that it comprises a pin coupled to the body body. delete In the electric oil pump,
A motor module including a motor housing and a rotation shaft that rotates to provide a driving force by the applied power;
An inner rotor that rotates by the rotational force of the rotating shaft and has an inlet through which fluid is introduced and a discharge port through which fluid is discharged by pressurizing the fluid in the inlet, and has a pump housing coupled to the motor module, and rotates by being coupled with the rotating shaft. A pump module having an outer rotor coupled to the inner rotor;
Including; a control housing and a control module for accommodating a configuration provided to control the driving of the motor module inside the control housing and communicate with the central control unit;
A lower control panel that controls the motor module and an upper control panel that controls communication are vertically separated and arranged,
The rotation shaft and the inner rotor are coupled by a vandal key, and one side of the rotation shaft is supported by a bush coupled to the motor housing and the other side by a bush coupled to the pump housing. The method of claim 4,
A high-height condenser is disposed in the lower control panel,
The upper control panel is an electric oil pump, characterized in that the area in which the condenser is disposed is separated from the lower control panel by a set height avoiding a space and is coupled to the control housing. The method of claim 5,
The electric oil pump, characterized in that the PCB, the capacitor, etc. are disposed on the upper side of the lower control panel, and the FET is disposed on the lower side. delete

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