KR20140087180A - Motor connecting structure of an electric water pump - Google Patents

Abstract

Disclosed is a motor connecting structure of an electric water pump. According to an embodiment of the present invention, the motor connecting structure of the electric water pump comprises an impeller case which has an inlet and an outlet for introducing and discharging cooling water by rotation of an impeller; a motor case coupled to a lower part of the impeller case; a fixing shaft which has a lower end fixed to a central lower part of the motor case and an upper end coupled with the impeller to be rotated; a stator which has a permanent magnet inserted thereinto and is pressed into the fixing shaft; a tube type magnet which is coupled with the impeller and inserted between the motor case and the stator; and a driver case which has a PCB substrate for controlling a motor installed therein and is attached to the lower part of the motor case. An electric wire of the stator is connected to the PCB substrate by a coupling force between the motor case and the driver case.

Description

TECHNICAL FIELD [0001] The present invention relates to a motor connection structure of an electric water pump,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water pump for circulating cooling water for cooling an automobile engine, and more particularly to a motor connection structure of an electric water pump that can facilitate connection between a PCB substrate and a stator wire.

In recent years, the development of automobiles has been focused on eco-friendly, high-efficiency, and high-fuel-efficiency vehicles. In order to achieve these goals, motor parts are being motorized, and engines and heaters Research is being actively carried out for the mobilization of a water pump, which is a key component for circulating cooling water.

The cooling water discharged from the water pump performs heat exchange with the engine, the heater, or the radiator, circulates, and then flows into the water pump again.

These water pumps are largely divided into a mechanical water pump and an electric water pump.

As the mechanical water pump is driven by the rotation of the crankshaft, that is, the rotational driving force of the engine, the flow rate of the cooling water discharged from the mechanical water pump is determined in accordance with the rotational speed of the engine as the mechanical water pump is connected to the pulley fixed to the crankshaft of the engine, do.

However, the flow rate of the cooling water required in the heater and the radiator is determined irrespective of the rotational speed of the engine. Therefore, the heater and the radiator were not operated normally in the low engine speed region, and the engine speed was increased in order to operate the heater and the radiator normally. As a result, the fuel efficiency of the vehicle is lowered.

In addition, since the mechanical water pump is driven in conjunction with the rotation of the engine, the engine cooling can not be arbitrarily controlled in an optimal state, the engine load is increased to reduce the fuel efficiency of the entire vehicle, There is a problem.

As a result, the electric water pump has been developed to improve the problem of the mechanical water pump. The electric water pump, unlike the mechanical water pump, is driven by the motor in which the power source is the battery and the power supply is controlled by the control device. There is an advantage that the flow rate of the cooling water can be determined regardless of the rotation speed.

However, since the components used in electric water pumps operate by electricity, it is important that the electrically operated components have sufficient waterproof performance, and sufficient waterproof performance is the key to increasing the performance and durability of electric water pumps .

Generally, an electric water pump includes an impeller case formed with an inlet through which cooling water flows and an outlet through which cooling water is discharged, an impeller case rotatably disposed inside the impeller case, and a pump for pumping cooling water, And a motor case having an electric motor therein for rotating the motor case.

At this time, when the electric motor is a DC motor, the rotation shaft of the DC motor and the impeller shaft combined with the impeller are rotated to rotate, and the impeller shaft is rotatably supported by bearings like a mechanical water pump, The water pump has a disadvantage in that the volume of the water pump is increased by the length of the DC motor and the impeller shaft and a separate sealing or bypass line is required to prevent the cooling water from infiltrating into the bearing.

In order to convert the electric water pump into a compact and optimized structure, a BLDC motor is used as the electric motor, an impeller shaft is fixed to the center of the motor case, a stator and a rotor are provided, There has been developed an electric water pump in which the impeller is rotated by the rotation of the rotor so as to be rotatably inserted into the impeller shaft.

However, in the case of the electric water pump according to the conventional art having the above-described structure, since the rotor and impeller integrated inserts are inserted into the fixed impeller shaft and rotated, the inner diameter surface contacting the impeller shaft is deteriorated and scratched And the rotation center is finely twisted due to thermal expansion, so that it is difficult to pumping a fixed amount.

The electronic water pump of Patent Document 1, which is searched as prior art which is the background of the invention, is covered with an electrically operated stator and a case of a resin material having a waterproof performance of the rotor to increase its performance and durability, The stator is mounted in the stator by the insert mallet ELD to simplify the production of the stator and the initial mobility is improved by changing the control signal in accordance with the initial position of the rotor.

In the motor-driven water pump of Patent Document 2, the rotor is inserted into the lower portion of the impeller, and the impeller is disposed in the inner diameter direction of the stator. The integral type impeller includes a rotating body inserted into the impeller shaft, A bushing made of a graphite material is provided to prevent deterioration during rotation of the rotating body, to prevent flaws or damage, and to prevent rotation center from being rotated.

Korean Patent Publication No. 10-2011-0055289 (published on 25.25.2011) Korean Patent Laid-Open No. 10-2012-0117416 (disclosed on 24th, 2012)

The object of the present invention is to provide a motor connection structure of an electric water pump which is simple in construction and which can increase the performance and durability of a pump by securing sufficient waterproof performance with a simple structure, .

It is another object of the present invention to provide a motor connection structure of an electric water pump which can easily connect a connection port of a PCB substrate and a stator wire when the integrated case is coupled with a driver case using an integral cap.

According to an aspect of the present invention, there is provided an electric water pump including: an impeller case having an inlet port and an outlet port through which coolant flows and is discharged by rotation of an impeller; A motor case coupled to a lower portion of the impeller case; A lower end fixed to a lower center of the motor case, and a fixed shaft rotatably coupled to the upper end of the impeller; A stator in which a permanent magnet is inserted and press-fitted into the stationary shaft; A tubular magnet coupled with the impeller and inserted between the motor case and the stator; And a driver case having a PCB substrate for motor control and attached to a lower portion of the motor case, wherein the electric wires of the stator are connected to the PCB substrate by a coupling force between the motor case and the driver case.

Wherein the connection structure includes a through pin inserted into the PCB substrate to draw the electric wire of the stator, a notched groove formed in the through pin to prevent a flow of the drawn wire due to no clearance by tightening the end portion, And the fastening cap may be press-fitted into the through-pin so as to fasten the end of the through-pin by the fastening force of the driver case.

The fastening pin may be inclined so that the end of the through-pin may be tilted when the through-pin is press-fitted into the through-pin, and the inclined bottom may be smaller than the diameter of the through-pin.

According to the embodiment of the present invention, the motor case is attached so that the lower end of the support shaft is positioned at the center after the stator inserted with the permanent magnet is press-fitted into the support shaft, the tubular magnet coupled with the impeller is inserted between the stator and the motor case And the tubular magnet is coupled to the impeller rotatably coupled to the upper portion of the support shaft so that the electrically operated stator and the rotor are sufficiently watertight and the manufacturing is simple and the space between the tubular magnet and the stator It is possible to discharge the water contained in the cooling water.

According to the embodiment of the present invention, since the through-pin is press-fitted by the coupling cap using the coupling force when the motor case and the driver case are engaged, it is possible to facilitate the connection between the PCB substrate and the stator wire.

1 is a perspective view showing an electric water pump according to an embodiment of the present invention,
Fig. 2 is an exploded perspective view of the pump of Fig. 1,
3 is a cross-sectional view taken along line AA in Fig. 1,
Fig. 4 is a detailed sectional view showing the motor connection structure of the electric water pump of Fig. 1;

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The terms used below are defined in consideration of the functions of the present invention, which may vary depending on the user, the intention or custom of the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

Fig. 1 shows an electric water pump according to an embodiment of the present invention. Fig. 2 is an exploded perspective view of the pump of Fig. 1, and Fig. 3 is a sectional view taken along line A-A of Fig.

1 to 3, an electric water pump 100 according to an embodiment of the present invention includes an upper impeller case 20 and a lower motor case 40 having upper and lower seal rings 12 They are sealed together and fixedly coupled, and various components are installed inside. A driver case 80 having a PCB substrate 90 for motor control for supplying electric power to the components of the electric motor provided in the motor case 40 is attached to the lower portion of the motor case 40.

The impeller case 20 is formed with an inlet 22 through which cooling water flows and an outlet 24 through which cooling water is discharged. The impeller 30 is rotatably installed inside the impeller case 20 and discharges the cooling water flowing from the inlet port 22 to the outlet port 24 by the rotation of the impeller 30. [

The motor case 40 is coupled to the lower portion of the impeller case 20 and has a stationary shaft 70 as a component of the electric motor and a tubular magnet 50 and a stator 60 disposed therein.

The lower end of the stationary shaft 70 serving as the rotation center of the impeller 30 is fixed to the lower center of the motor case 40. The impeller 30 is rotatably coupled to the upper end of the stationary shaft 70, As the magnet 50 is engaged, the tubular magnet 50 rotates as the impeller 30 rotates.

The impeller 30 may include a disk 32, a plurality of vanes 34 on the upper surface thereof, and a ring plate 36.

1, the impeller 30 may protrude from the center of the boss 38 into which the upper end of the fixing shaft 70 is inserted through the carbon bearing 36 (see FIG. 3). The vanes 34 are radially projected with an inclination angle about the bosses 38.

The ring plate 36 is formed with a fastening hole 39 through which the boss 38 penetrates to penetrate the stationary shaft 70. The ring plate 36 is disposed to face the upper portion of the vane 34, A plurality of slits 37 having a shape corresponding to the cross-sectional shape are formed on the bottom surface.

The impeller 30 is made of a high strength resin material such as an engineering plastic such as a circular plate 32, a vane 34 and a ring plate 36. The impeller 30 is manufactured by injection molding using a metal mold and then subjected to ultrasonic welding And can be integrally joined by the method.

The plurality of vanes 34 are inserted into the slit 37 of the ring plate 36 to increase the adhesive force between the vane 34 and the ring plate 36 as the fusion area increases in ultrasonic welding Can be further increased.

A plurality of protrusions 52 are formed on the upper end of the tubular magnet 50 at predetermined intervals and correspond to the lower surface of the disc 32 of the impeller 30 so that the protrusions 52 can be inserted and engaged with each other. The tubular magnet 50 and the impeller 30 are formed in the insertion groove 31 so that the ultrasonic welding is performed while the protrusions 52 of the tubular magnet 50 are inserted into the insertion groove 31, Can be integrally joined.

Since the impeller 30 rotatably inserted into the upper end of the stationary shaft 70 can be displaced in the axial direction by the high speed rotation, the stationary shaft 70 is provided at its upper end with a release preventing groove 72, It is possible to prevent the impeller 30, which is rotating at a high speed, from coming off in the axial direction by engaging with the fastening pin 74 in the preventing groove 72.

The stator 60 inserts the permanent magnet 62 into the fixed shaft 70 and presses the permanent magnet 62 between the motor case 40 and the tubular magnet 50 and between the tubular magnet 50 and the stator 60 Rotation gaps can be formed respectively.

The tubular magnet 50 constitutes a BLDC motor together with the stator 60. The tubular magnet 50 is a magnet as a rotor and the stator 60 has a permanent magnet 62 as a stator . That is, a rotating system is formed in the stator 60 according to an electrical signal, and the tubular magnet 50 is rotated. The operation principle between the stator and the rotor of the BLCD motor can be realized by the prior art, do.

As the tubular magnet 50 rotates, the impeller 30 coupled to the tubular magnet 50 and rotatably coupled with the bearing 36 at the upper end of the stationary shaft 30 also rotates, The cooling water flowing from the inlet port 22 of the impeller case 20 through the rotation of the impeller 30 is discharged to the discharge port 24 but is discharged between the motor case 40 and the tubular magnet 50 and between the tubular magnet 50, And the stator 60, respectively. The cooling water can also flow into the gap between the stator 60 and the stationary shaft 70 in which the permanent magnet 62 is inserted.

However, since the stator 60 is constituted by the tube-shaped magnet 50 as the rotor and the stator 60 as the stator, it is not affected by the invasion of the cooling water at all, and the cooling water flowing into the rotation gap is also discharged The cooling capacity can be larger than that of the pump of the same volume.

Fig. 4 is a detailed sectional view showing the motor connection structure of the electric water pump of Fig. 1; 4, a driver case 80 is attached to a lower portion of the motor case 40, and a driver case 80 is provided in the motor case 40 to supply electric power to the components of the electric motor provided in the motor case 40 A PCB substrate 90 may be embedded as an electrical supply set.

The motor connection structure of the electric water pump according to an embodiment of the present invention facilitates the connection of the electric wires of the rotor and the stator to the PCB substrate 90.

A through pin 92 for inserting a wire of a rotor or a stator is inserted into the PCB substrate 90.

The through-hole pin 92 is formed with a notch groove 94. When the end of the through-hole pin 92 is tightened, the gap of the notch groove 94 disappears, and the flow of the wire is prevented by tightening the entered wire.

A fastening cap 96 is mounted on the lower portion of the through pin 92. The through pin 92 is inserted into the fastening cap 96 to be inclined so that the end of the fastening pin 92 may be broken. It is preferable that the inclined lower surface of the through-hole 96 is smaller than the diameter of the through-pin 92.

The fastening cap 96 presses the through-hole pin 92 by the coupling force when the motor case 40 is coupled with the driver case 80 so that the through-hole pin 92 contacts the inclined surface of the fastening cap 96 As a result, the gap of the notch groove 94 disappears and the drawn wire is tightened.

According to the structure as described above, the motor assembly structure of the electric water pump according to one embodiment of the present invention can facilitate the connection between the PCB board and the stator wire.

As described above, the present invention is only one preferred embodiment of the motor assembly structure of the electric water pump according to the present invention, and the present invention is not limited to the above-described embodiments, It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. It should be understood that many other modifications and applications are possible within the scope of the basic technical idea of the present invention.

20: impeller case 22: inlet
24: outlet 30: impeller
32: Disc 34: Vane
36: ring plate 40: motor case
50: tubular magnet 60: stator
70: stationary shaft 80: driver case
90: PCB substrate 92: Through-pin
94: notch groove 96: fastening cap

Claims (3)

An impeller case having an inlet port and an outlet port through which coolant flows and is discharged by rotation of the impeller;
A motor case coupled to a lower portion of the impeller case;
A lower end fixed to a lower center of the motor case, and a fixed shaft rotatably coupled to the upper end of the impeller;
A stator in which a permanent magnet is inserted and press-fitted into the stationary shaft;
A tubular magnet coupled with the impeller and inserted between the motor case and the stator; And
And a driver case having a PCB substrate for motor control and attached to a lower portion of the motor case,
And a connection structure in which electric wires of the stator are connected to the PCB substrate by a coupling force between the motor case and the driver case
Motor connection structure of electric water pump.
The method according to claim 1,
The connection structure
A through pin inserted into the PCB substrate to receive the electric wire of the stator,
A through-hole formed in the through-pin so as to prevent a flow of the drawn-in wire due to no clearance by tightening the end,
Wherein the fastening cap is press-fitted into the through-pin so as to fasten the end of the through-pin by the fastening force of the motor case and the driver case,
Motor connection structure of electric water pump.
3. The method of claim 2,
Wherein the fastening pin is inclined so that an end of the through pin can be tightened when the fastening pin is press-fitted into the through pin,
Motor connection structure of electric water pump.

Images