WO2012064119A2 - Water pump for vehicle - Google Patents

Abstract

Provided is a water pump for a vehicle. A water pump for a vehicle according to the present invention includes a pump body that has a region corresponding to a rotor chamber and a region corresponding to a driver chamber, and which is integrated with a stator and a connector through an insert molding process. Thus, the waterproof performance of the water pump is improved, and an assembly structure thereof is simplified as to improve assembling efficiency. A water pump for a vehicle according to the present invention includes: a pump body that is integrated with a stator and a connector, and which has a portion of a rotor chamber at an upper end thereof, and a portion of a driver chamber at a lower end thereof; a rotator assembly that is coupled to the rotor chamber, and presses and discharges introduced coolant by means of the rotation of an impeller coupled to an upper end of a rotation shaft, according to the rotation of the rotation shaft to which a rotor facing the stator is fixed; and a driver cover for covering the driver chamber to which a driver including the connector is coupled.

Description

Automotive Water Pumps

The present invention relates to a water pump for automobiles, and more particularly, to form a region of the rotor chamber and the driver chamber, and to implement the integrated pump body by insert molding the stator and the connector, thereby improving the waterproof performance and assembly of the water pump The present invention relates to a water pump for an automobile for improving the assemblability through the simplification of the structure.

The present invention also relates to a water pump for automobiles which is fastened in a structure in which the water pump is directly coupled to the engine block according to the case where the pump cover is coupled to the pump body or the pump cover is not coupled.

Engines powered by burning fuel become hot due to the temperature of the combustion gases combusted in the cylinder, and cooling is essential to protect the parts around the combustion chamber constituting the engine. To this end, the motor vehicle is equipped with a water pump to circulate the coolant and to allow the engine to maintain the proper temperature. That is, a water jacket for passing the coolant is formed in the cylinder block and the cylinder head constituting the engine, and a water pump for pumping the coolant with the water jacket is provided at one front side of the engine. In this case, a radiator for cooling the coolant heated by the engine is formed in front of the water pump, and a coolant hose for inflow and outflow of the coolant is connected between the radiator and the water jacket.

Here, briefly look at the circulating process of the coolant by the water pump, the coolant flowed out by the water pump is introduced into the water jacket provided in the cylinder block and the cylinder head in the high temperature state is heated as the heat exchange is made, the heat radiating process in the radiator After passing through the water pump is repeated.

On the other hand, the water pump is classified into a mechanical pump that is driven by the drive force of the engine transmitted by the belt or chain, an electronic pump rotated by the drive of the motor.

First, the mechanical water pump is connected to a pulley fixed to the crankshaft of the engine and drives in accordance with the rotation of the crankshaft (ie the rotation of the engine). At this time, the flow rate of the cooling water flowing out of the mechanical water pump is determined according to the rotational speed of the engine. On the other hand, the flow rate of the cooling water required in the heater and the radiator is constant regardless of the rotational speed of the engine. This not only makes it difficult to operate the heater and the radiator normally in the region where the engine speed is low, and as a result, increases the engine speed in order to operate the heater and the radiator normally, thereby reducing the fuel economy of the vehicle.

Next, the electronic water pump is driven in accordance with the rotation of the motor controlled by the controller. That is, the electronic water pump has recently been in the spotlight compared to the mechanical water pump because the flow rate of the cooling water can be determined regardless of the rotation speed of the engine.

However, since the electronic water pump uses an electric pump motor or the like, it is necessary to develop various technologies capable of securing sufficient waterproof performance to improve performance and increase durability.

To this end, conventional electronic water pumps use a mechanical seal to seal the pump motor to prevent water from draining to the inside of the water pump or bearing failure due to cooling water leakage, shortening the belt life, and the like. . This requires a post-processing process in which a separate mechanical seal is mounted on the water pump, resulting in a cost increase of the motor due to an increase in processing cost and material cost.

In addition, the conventional electronic water pump removes the mechanical seal and inserts a canned cover to form a box outside the rotor of the motor to seal the rotor of the motor in a fluid. This can prevent the water leaking from the motor rotor to the stator to some extent, but because the can cover must be manufactured separately, the cost of the unit increases and assembly productivity decreases. In addition, when the can cover is applied, no alternative is proposed for the waterproof structure for water flowing into the stator from the outside.

Moreover, such an electronic water pump doubles the rotor, stator chamber and driver chamber of the pump body, respectively. That is, in the related art, the rotor, the stator chamber, and the driver chamber are implemented by assembling the driver cover to the driver case after coupling the drive case to the pump body.

As described above, in the related art, a series of assembling processes such as a combination of a rotor and a stator of a motor, an assembly of a can cover, and a combination of a driver case and a driver cover are sequentially performed to complicate the structure and assembly of the water pump. This in turn increases the manufacturing cost of the water pump and leads to a decrease in productivity.

In addition, the conventional water pump connects a coolant hose for inflow and outflow of coolant between the radiator and the water jacket, and needs to replace the coolant hose when the coolant hose is damaged by vibration or shock caused by driving of the vehicle.

Therefore, the prior art as described above has a problem in that the productivity is reduced by forming a waterproof cover by separately providing a can cover on the water pump, and the assembly structure is complicated by configuring the stator, the rotor chamber, and the driver cover in duplicate, It is a problem of the present invention to be solved.

Therefore, the present invention forms an area of the rotor chamber and the driver chamber and implements the integrated pump body by insert molding the stator and the connector, thereby improving the waterproof performance of the water pump and improving the assemblability through the simplification of the assembly structure. The object is to provide an automotive water pump.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned above can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to achieve the above object, the present invention provides a water pump, comprising: a pump body for forming a stator and a connector into an integrated structure, and independently forming some structures of a rotor chamber at a top and a driver chamber at a bottom; A rotating assembly coupled to the rotor chamber, for rotating the impeller coupled to the upper end of the rotating shaft by the rotation of the rotating shaft to which the rotor facing the stator is fixed, to pressurize and discharge the cooling water introduced from the outside; And a driver cover for covering the driver chamber to which the driver including the connector is coupled.

In addition, the present invention further includes a pump cover coupled to the pump body to guide the coolant flow and to form a volute chamber for pressurizing the coolant by the rotation of the impeller.

The pump cover is characterized in that it is inserted into the engine block.

The engine block is directly coupled to the pump body to guide the coolant flow, and characterized in that to form a volute chamber for pressurizing the coolant by the rotation of the impeller.

The pump body is characterized in that the molding by insert molding using a single material of polyphenylene sulfide (PolyPhenylene Sulfide (PPS) or BMC).

The rotor is characterized in that the back yoke and the permanent magnet is first fixed by the rotor cover, and the outer circumferential surfaces of the back yoke and the back yoke is wrapped by insert molding by BMC, characterized in that the second fixed.

The rotating assembly is characterized in that the bearing is inserted and coupled to the upper and lower ends when coupled to the rotor chamber.

On the other hand, the present invention provides a water pump, comprising: a pump body for molding the stator and the connector into an integrated structure, and independently forming some structures of the rotor chamber at the top and the driver chamber at the bottom; A rotating assembly coupled to the rotor chamber, for rotating the impeller coupled to the upper end of the rotating shaft by the rotation of the rotating shaft to which the rotor facing the stator is fixed, to pressurize and discharge the cooling water introduced from the outside; And a driver cover for covering the driver chamber to which the driver including the connector is coupled, wherein the stator exposes a portion of the stator core to the outside of the pump body.

In addition, the present invention further includes a pump cover coupled to the pump body to guide the coolant flow and to form a volute chamber for pressurizing the coolant by the rotation of the impeller.

The stator core is directly coupled to the engine block by forming a fastening hole penetrating a portion exposed to the outside of the pump body.

The stator core is characterized in that the engine block is directly coupled to form a fastening hole through a portion exposed to the outside of the pump body, the engine block guides the coolant flow, by the rotation of the impeller It is characterized by forming a volute chamber for pressurizing the cooling water.

The pump body is characterized in that the molding by insert molding using a single material of polyphenylene sulfide (PolyPhenylene Sulfide (PPS) or BMC).

The stator core is characterized in that the through-hole or outer peripheral groove for filling the polyphenylene sulfide or the molding material of the BMC is formed in the insert molding to be fixed to the pump body.

The rotor is characterized in that the back yoke and the permanent magnet is first fixed by the rotor cover, and the outer circumferential surfaces of the back yoke and the back yoke is wrapped by insert molding by BMC, characterized in that the second fixed.

The rotating assembly is characterized in that the bearing is inserted and coupled to the upper and lower ends when coupled to the rotor chamber.

As described above, the present invention forms an area of the rotor chamber and the driver chamber and implements the integrated pump body by insert molding the stator and the connector, thereby improving the waterproof performance of the water pump and simplifying the assembling structure. There is an effect that can be improved.

In addition, the present invention provides the rotor chamber corresponding to the canned structure as an integrated pump body to produce a water pump without inserting a separate cover cover, thereby reducing the cost increase factor due to the increase in processing cost and material cost.

In addition, the present invention can extend the stator to the outside to maximize the heat dissipation effect and at the same time establish a stable support structure for mounting to the engine block to improve the assemblability.

In addition, the present invention has the effect of providing a coolant circulation without a coolant hose by directly coupling the water pump to the engine block.

1A is a cross-sectional view of a water pump to which a waterproof structure according to a first embodiment of the present invention is applied;

1B is an exploded cross-sectional view of the water pump of FIG. 1A,

1C is a top view of the pump body in the water pump of FIG. 1A,

2A is a cross-sectional view of a water pump to which a waterproof structure according to a modified embodiment of the first embodiment is applied;

2b is a plan view of the pump body in the water pump of FIG. 2a,

3A is a cross-sectional view of a water pump to which a waterproof structure according to a second embodiment of the present invention is applied;

3b is a plan view of the pump body in the water pump of FIG.

4A is a cross-sectional view of a water pump to which a waterproof structure according to a modified embodiment of the second embodiment is applied;

4B is a top view of the pump body in the water pump of FIG. 4A.

The above objects, features, and advantages will become more apparent from the detailed description given hereinafter with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention pertains may share the technical idea of the present invention. It will be easy to implement. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1A is a cross-sectional view of a water pump to which a waterproof structure according to a first embodiment of the present invention is applied, FIG. 1B is an exploded cross-sectional view of the water pump of FIG. 1A, and FIG. 1C is a view of the pump body of the water pump of FIG. 1A. Top view. 1A and 1B show a cross-sectional view along the line AA ′ in FIG. 1C.

The water pump to which the waterproof structure according to the first embodiment of the present invention is applied includes a pump body 110, a pump cover 120, a driver cover 130, and a stator 140. , A rotor 150, a rotation assembly 160, and a driver 170.

The water pump according to the first embodiment basically has a waterproof structure in which a canned cover is not inserted, and the stator 140 and the connector 171 are formed of a single material (for example, through insert molding). , Polyphenylene sulfide (PolyPhenylene Sulfide (PPS), BMC, etc.) of the pump body 110 is molded in an integral structure. In this case, the water pump not only directly couples the pump cover 120 to the pump body 110 composed of a single material, but also directly couples the engine block 180 to the pump body 110 without connecting a predetermined pipe. do. Here, polyphenylene sulfide (PPS) is a kind of thermoplastic resin, and has excellent heat resistance, chemical resistance, flame retardancy, and electrical characteristics, and has good affinity with inorganic materials.

Hereinafter, each component of the water pump according to the first embodiment will be described in detail.

The pump body 110 has an upper and lower open structure, but the upper and lower regions do not penetrate each other and form part of the rotor chamber RC and the driver chamber DC as independent spaces. In this case, the pump body 110 does not form a series of stator chambers, rotor chambers RC, and driver chambers DC by assembling the driver cover after assembling the existing driver case to the bottom as an additional operation. As a result of the molding process of a single material unitary configuration as described above, some structures for the chamber configuration are integrally formed. That is, the pump body 110 integrally forms the stator 140 through insert molding in the case of the stator chamber, and forms some structure for forming the chamber in the opening at the upper end in the case of the rotor chamber RC. In the case of the driver chamber DC, the lower openings form some structure for the chamber configuration.

Here, the rotor chamber RC and the driver chamber DC are formed as independent spaces at the upper and lower ends of the pump body 110, respectively, so that the driver chamber DC may have the rotor chamber RC even though coolant is introduced into the rotor chamber RC. Shielding against cooling water leakage from the In particular, the rotor chamber RC can form a box on the outer side of the rotor 150 as a result of the molding of the pump body 110 even without inserting the can cover, so that the rotor 150 can be sealed to be immersed in the coolant. Form the structure corresponding to the cover.

The rotor chamber RC accommodates the rotation assembly 160 to which the rotor 150 is fixed, and the driver chamber DC accommodates the PCB 172 of the driver 170. In particular, the pump body 110 forms the connector 171 of the driver 170 into an integrated structure through insert molding. At this time, the PCB 172 is connected to the connector 171 through the connector pin 171a.

On the other hand, the pump body 110 is coupled to the pump cover 120 at the top after receiving the rotating assembly 160 is fixed to the rotor 150 in the rotor chamber (RC). In one example, the pump body 110 is coupled to the pump cover 120 using a screw or bolt 113a. At this time, each of the pump body 110 and the pump cover 120 is formed with a through hole for fastening. Here, the first O-ring groove 114a having a trench structure is formed in the pump body 110 to arrange the first O-ring 114 for sealing between the pump cover 120 and the pump cover 120.

In addition, the pump body 110 is coupled to the pump cover 120, and then coupled to the engine block 180. To this end, the pump body 110 extends to form a flange formed in a rectangular shape on the coupling side with the engine block 180, as shown in Figure 1c, each corner portion of the rectangular flange of the engine block ( The stud nut (113c) of the metal to form a strong bond with the 180 is integrally formed. The pump body 110 is fastened with a screw or bolt 113b to the stud nut for coupling with the engine block 180.

In addition, the pump body 110 receives the PCB 172 of the driver 170 in the driver chamber (DC) and then combines with the driver cover 130 at the bottom. In one example, the pump body 110 is coupled to the driver cover 130 using a screw or bolt 113d. At this time, each of the pump body 110 and the driver cover 130 is formed with extensions 115a and 115b for forming through holes for fastening.

In addition, a second o-ring groove 116a having a trench structure is formed in the driver cover 130 to arrange the pump body 110 and the second o-ring 116 for sealing.

The pump cover 120 serves as a flow path for the coolant to guide the flow of the coolant from the engine to the radiator. For this purpose, the pump cover inlet 121 connected to the engine and the pump cover outlet connected to the radiator are provided. An extension 122 is formed to a predetermined length. At this time, the pump cover 120 is formed at the top of the pump cover inlet 121 connected to the engine, the coolant is introduced from the engine, the pump cover outlet 122 connected to the radiator to form an impeller (162) The pressurized cooling water flows out to the radiator by the rotation of). At this time, the pump cover 120 forms a narrow pump cover outlet 122 compared with the pump cover inlet 121 to pressurize the coolant to increase the heat radiation effect of the coolant.

In addition, the pump cover 120 forms a cooling water circulation passage through coupling with the pump body 110, and forms a volute chamber (VC) therein for pressurizing the cooling water by the rotation of the impeller 162. .

The driver cover 130 is coupled to the lower opening of the pump body 110. At this time, the driver cover 130 is in close contact with the pump body 110 after the second O-ring 116 is inserted into the second O-ring groove 116a formed to protrude on the surface to be coupled to the pump body 110. Combined. Here, the driver cover 130 is preferably made of an aluminum material in order to heat the heat generated from the driver 170 to the outside.

Since the stator 140 is integrally formed in the pump body 110 and is integrally formed, the stator 140 is not mounted in a separate stator chamber, and shielding against cooling water leakage is ensured. In this case, the stator 140 includes a stator core 141, a bobbin 142, and a coil 143.

The stator 140 combines the stator core 141 formed by stacking a plurality of thin plates made of a magnetic material with a bobbin 142 made of an insulating resin, and then forms a coil 143 on the outer circumference of the bobbin 142. . Here, the bobbin 142 may form a structure in which the upper and lower bobbins are combined or may be integrally formed on the outer circumferential surface by insert molding the stator core 141.

Here, although the stator 140 is not shown in the drawing, a hall sensor substrate and a coil 143 for sensing the position of the rotor 150 when the stator 140 is integrally formed in the pump body 110 and integrally formed therein The connection line to the PCB 172 for applying the driving signal to the embedded together is molded.

The rotor 150 includes a back yoke 151, a permanent magnet 152, a rotor cover 153, and a rotor case 154. At this time, the rotor 150 alternately mounts a plurality of permanent magnets 152 of the N pole and the S pole on the outer circumferential surface of the back yoke 151 fixed to the rotation shaft 161. At this time, a plurality of grooves (not shown in the figure) are formed on the outer circumferential surface of the back yoke 151 so that the permanent magnet 152 is inserted and mounted therein.

In addition, the rotor cover 153 is fixed to the back yoke 151 and the permanent magnet 152 by press-fitting the upper and lower ends in the state in which the permanent magnet 152 is inserted into the back yoke 151. At this time, the rotor cover 154 is made of copper or stainless steel having a large specific gravity, and is produced in consideration of the function of the balance weight (balance weight) to balance the external force acting by the rotation of the rotor 150. In addition, the rotor case 154 is fixed to the outer circumferential surface of the rotor cover 153 in the upper and lower ends of the back yoke 151 and the permanent magnet 152 to be secondarily fixed. Here, the rotor case 153 is manufactured by insert molding using a BMC (Bulk Mold Compound) as a composite material containing a potassium-based low shrinkage material. It not only fixes the back yoke 151 and the permanent magnet 152, but also serves as a sealing function for the cooling water of the rotor 150.

As described above, the rotor 150 double-fixes the back yoke 151 and the permanent magnet 152 by the rotor cover 153 and the rotor case 153, thereby the permanent magnet 152 from the back yoke 151. This can prevent departure. In addition, the rotor 150 has a characteristic of generating heat as it rotates, and may be continuously cooled by the coolant introduced into the rotor chamber RC.

In the above embodiment, although the permanent magnet 152 having the divided piece structure is used, it is also possible to use a ring-shaped permanent magnet in which a plurality of N poles and S poles are divided and magnetized.

The rotary assembly 160 is an assembly of the rotor 150 and the impeller 162 with respect to the rotary shaft 161, the impeller (161) fixed to the rotary shaft 161 due to the rotation of the rotor 150 opposite the stator 140 ( 162 rotates together. Here, the central axis of the rotating shaft 161 is a reference of the axis alignment with respect to the center of the stator 140, which is a fixed element, the rotor 150 and the impeller 162, which is a rotating element. That is, the central axis of the rotating shaft 161 is a reference for suppressing the vibration and noise that may occur during the operation of the water pump by preventing the center axis of the fixed element and the rotating element is misaligned.

When the rotating assembly 160 is assembled to the rotor chamber RC of the pump body 110, the first and second bearings 111 and 112 for smoothly and supporting the rotation of the rotating shaft 161 are coupled to each other. Here, the first bearing 111 is composed of a pair of semi-circular structure, each of which is detachably coupled to the rotary shaft 161 in the completion state of the rotary assembly 160, or is made of a conventional circular structure impeller (rotator 160) It may be coupled to the rotary shaft 161 before assembly of the 162. In addition, the second bearing 112 is press-fitted into the pump body 110 in a pair of semi-circular or conventional circular structures, and then the rotary assembly 160 is assembled to the rotor chamber RC of the pump body 110. When combined with the rotating shaft 160. In this case, a mounting groove (not shown) for coupling the first and second bearings 111 and 112 may be formed on an outer circumferential surface of the rotation shaft 161.

The impeller 162 is fixed to the rotating shaft 161 by the shaft screw 163, for example, and has a plurality of wings having a downward slope from the central axis to the bent portion of the pump cover 120. The impeller 162 serves to pressurize the coolant flowing from the pump cover inlet 121 through the high speed rotation to the pump cover outlet 122.

The driver 170 includes a connector 171 to which the connector pin 171a is connected and a printed circuit board 172 on which a motor driving circuit is mounted. Here, the connector pin 171a extends into the connector housing which is integrally formed with the pump body 110 to constitute the connector 171. At this time, the PCB 172 is electrically connected to the outside through the connector pin 171a to receive the control signal applied from the outside and the position signal from the Hall sensor to control the operation of the water pump. Here, the PCB 172 is coupled to the pump body 110 by screw coupling or snap coupling.

Briefly describing the assembly process of the water pump, first, the pump body 110 is formed by molding the stator 140 and the connector 171 by insert molding in a single configuration of a single material. At this time, the rotation assembly 160 forms a complete body in which the rotor 150 and the impeller 162 are coupled to the rotation shaft 161.

Thereafter, the rotary assembly 160 is assembled by combining the first and second bearings 111 and 112 to the rotor chamber RC formed at the top of the pump body 110, and the pump cover 120 is the pump body 110. It is coupled to the pump body 110 in a state of assembling the rotary assembly 160 in the rotor chamber (RC). In addition, the PCB 172 of the driver 170 is mounted in the driver chamber DC formed at the bottom of the pump body 110. The driver cover 130 is coupled to the pump body 110 in a state in which the PCB 172 is assembled to the driver chamber DC of the pump body 110.

Thereafter, the finally completed water pump is directly coupled to the engine block 180 to complete the assembly. In particular, when the water pump is coupled to the engine block 180, a third O-ring 117 is inserted between the pump cover 120 and the engine block 180 to ensure sealing performance. In this case, the pump cover 120 and the engine block 180 form a space in which the third O-ring 117 is inserted and tightly coupled when the pump cover 120 and the engine block 180 are coupled, and the engine block 180 is bent in the pump cover 120. A stepped structure is formed corresponding to the portion (see FIG. 1A).

FIG. 2A is a cross-sectional view of the water pump to which the waterproof structure according to the modified embodiment of the first embodiment is applied, and FIG. 2B is a plan view of the pump body in the water pump of FIG. 2A. FIG. 2A is a cross-sectional view taken along line BB ′ in FIG. 2B.

The water pump according to the modified embodiment of the first embodiment has a structure in which the pump cover 120 is removed from the water pump according to the first embodiment, and the coolant flow path shape of the pump cover 120 is implemented in the engine block 280. In the water pump according to the exemplary embodiment, the engine block 280 is responsible for the function of the pump cover 120.

Specifically, the water pump according to the modified embodiment of the first embodiment, like the water pump according to the first embodiment, the pump body 210, the driver cover 230, the stator 240, the rotor 250, the rotary assembly 260 and a driver 270. In this case, the stator 240 includes a stator core 241, a bobbin 242, and a coil 243, and the rotor 250 includes a back yoke 251, a permanent magnet 252, a rotor cover 253, and a rotor. And a case 254. In addition, the rotary assembly 260 includes a rotor 250, a rotation shaft 261, an impeller 262, and the driver 270 includes a connector 271, a connector pin 271a and a PCB 272.

As such, since the main components of the water pump according to the modified embodiment of the first embodiment overlap with the main components of the water pump according to the first embodiment, a detailed description thereof may be easily understood by those skilled in the art.

However, since the pump body 210 does not have a pump cover structure, a fastening hole for coupling with the pump cover is not formed. Accordingly, the O-ring 214 corresponding to the first O-ring 114 of FIG. 1A is disposed between the engine block 280 and the engine block 280.

In particular, the engine block 280 has a flow path of cooling water formed therein in place of the pump cover 120 of the water pump according to the first embodiment. That is, the engine block 280 guides the flow of coolant from the engine to the radiator, like the pump cover 120 of the water pump according to the first embodiment, and for this purpose, the engine block inlet 281 and the radiator are connected to the engine. The engine block outlet 282 is connected.

In addition, the engine block 280 also uses a screw or bolt 213b and a stud nut 213c to fasten the coolant by the rotation of the impeller 262 by fastening the pump body 210. Form.

Briefly describing the assembly process of the water pump, first, the rotor assembly 260 is assembled to the rotor chamber (RC) formed on the top of the pump body 210 together with the first and second bearings (211,212). In addition, the PCB 272 of the driver 270 is mounted in the driver chamber DC formed at the bottom of the pump body 210. The driver cover 230 is coupled to the pump body 210 with the PCB 272 assembled to the driver chamber DC of the pump body 210. Thereafter, the finally completed water pump is directly coupled to the engine block 280 to complete the assembly.

3A is a cross-sectional view of the water pump to which the waterproof structure according to the second embodiment of the present invention is applied, and FIG. 3B is a plan view of the pump body in the water pump of FIG. 3A. 3A is a cross-sectional view taken along line C-C 'in FIG. 3B.

The water pump according to the second embodiment has a structure in which the stator core 341 of the stator 340 extends and is exposed to the outside of the pump body 310 in the water pump according to the first embodiment. The structure of fastening the stator core 341 to the engine block 380 is illustrated.

Specifically, the water pump according to the second embodiment, like the water pump according to the first embodiment, the pump body 310, the pump cover 320, the driver cover 330, the stator 340, the rotor 350 , Rotation assembly 360, driver 370. In this case, the stator 340 includes a stator core 341, a bobbin 342, and a coil 343, and the rotor 350 includes a back yoke 351, a permanent magnet 352, a rotor cover 353, and a rotor. And a case 354. In addition, the rotary assembly 360 includes a rotor 350, a rotation shaft 361, an impeller 362, and the driver 370 includes a connector 371, a connector pin 371a and a PCB 372. As described above, since the main components of the water pump according to the second embodiment overlap with the main components of the water pump according to the first embodiment, detailed descriptions thereof may be easily understood by those skilled in the art.

However, the stator 340 is partially formed in the pump body 310 by exposing the stator core 341 having a quadrangular shape to the outside of the pump body 310. Accordingly, a part of the stator core 341 is embedded in the pump body 310 so that the bobbin 342 may be coupled to the part where the coil 343 is wound and exposed to the outside of the pump body 310 to expose the engine block ( The part fastened to 380 is manufactured integrally.

To this end, the stator core 341 forms a through hole 341a through which the molding material of the pump body 310 can be inserted into the pump body 310 so as to be fixed to the pump body 310 even when the pump body 310 is exposed to the outside. Can be. In addition, the stator core 341 forms a fastening hole 341b that can be fastened to the engine block 380 by screws or bolts 313b. At this time, the stator core 341 is directly coupled to the engine block 380 by using a screw or bolt 313b, thereby not only dissipating heat generated from the coil 343 to the outside as the motor is driven, but also with the engine. Strong coupling fixation can be made and utilized as the ground of the coil 343 to emit electromagnetic noise to the outside.

Briefly describing the assembly process of the water pump, first, the rotor assembly 360 is assembled by combining with the first and second bearings 311 and 312 in the rotor chamber RC formed on the top of the pump body 310, The pump cover 320 is coupled to the pump body 310 in a state in which the rotary assembly 360 is assembled to the rotor chamber RC of the pump body 310.

In addition, the PCB 372 of the driver 370 is mounted in the driver chamber DC formed at the bottom of the pump body 310. The driver cover 330 is coupled to the pump body 310 in a state in which the PCB 372 is assembled to the driver chamber DC of the pump body 310.

Thereafter, the finally completed water pump directly couples the coupling part 313b penetrating through the stator core 341 exposed to the outside to the engine block 280 to complete the assembly.

4A is a cross-sectional view of the water pump to which the waterproof structure according to the modified embodiment of the second embodiment is applied, and FIG. 4B is a plan view of the pump body in the water pump of FIG. 4A. 4A is a sectional view taken along the line D-D 'in FIG. 4B.

The water pump according to the modified embodiment of the second embodiment has a structure in which the pump cover 120 is removed from the water pump according to the second embodiment, and the coolant flow path shape of the pump cover is implemented in the engine block 480 in the second embodiment. In the water pump according to the structure of the engine cover 480 responsible for the function of the pump cover 320 is shown.

Specifically, the water pump according to the modified embodiment of the second embodiment, like the water pump according to the second embodiment, the pump body 410, the driver cover 430, the stator 440, the rotor 450, the rotary assembly 460, a driver 470. In this case, the stator 440 includes a stator core 441, a bobbin 442, and a coil 443, and the rotor 450 includes a back yoke 451, a permanent magnet 452, a rotor cover 453, and a rotor. And a case 454. In addition, the rotation assembly 460 includes a rotor 450, a rotation shaft 461, an impeller 462, and the driver 470 includes a connector 471, a connector pin 471a, and a PCB 472. As such, since the main components of the water pump according to the modified embodiment of the second embodiment overlap with the main components of the water pump according to the second embodiment, detailed descriptions thereof may be easily understood by those skilled in the art.

However, since the pump body 410 does not have the pump cover 320 of FIG. 3A, a fastening hole for coupling with the pump cover is not formed.

In particular, the engine block 480 has a coolant flow path formed therein instead of the pump cover 320 of FIG. 3A. That is, the engine block 480 guides the flow of coolant from the engine to the radiator like the pump cover 320 of FIG. 3A, and for this purpose, the engine block inlet 481 connected to the engine and the engine block outlet connected to the radiator 482).

In addition, the engine block 480 is also coupled to the pump body 410 to form a volute chamber VC for pressurizing the coolant by the rotation of the impeller 462.

As shown in FIGS. 3A and 3B, the stator 440 is partially embedded in the pump body 410 by exposing the stator core 441 to the outside of the pump body 410. Accordingly, a part of the stator core 441 is embedded in the pump body 410 so that the bobbin 442 may be coupled to the part where the coil 443 is wound and exposed to the outside of the pump body 410 to expose the engine block ( The part fastened to 480 is manufactured integrally.

Here, the stator core 441 may include the stator core 441 itself as a quadrangle as shown in FIGS. 3A and 3B, but the outer peripheral grooves 441a of the stator core 441 are formed and the molding material of the pump body 410 is formed. It is inserted into the outer circumferential groove 441a to form a rectangular structure. That is, the stator core 441 may be fixed to the pump body 310 even when the molding material of the pump body 310 fills the outer circumferential groove 441a to expose the pump body 410 to the outside. In addition, the stator core 441 is formed with a fastening hole 441b that can be fastened to the engine block 480 by a screw or bolt 413b.

Briefly describing the assembly process of the water pump, first, the rotor assembly 460 is coupled to the rotor chamber RC formed on the top of the pump body 410 together with the first and second bearings 411 and 412. In addition, the PCB 472 of the driver 470 is mounted in the driver chamber DC formed at the bottom of the pump body 410. The driver cover 430 is coupled to the pump body 410 in a state in which the PCB 472 is assembled to the driver chamber DC of the pump body 410. Thereafter, the finally completed water pump directly couples the coupling part 413b penetrating through the stator core 441 exposed to the outside to the engine block 480 to complete the assembly.

3A to 4B, the modified example of the second and second embodiments is installed at the upper side of the pump bodies 310 and 410 so as to be inserted into the engine blocks 380 and 480, and thus may be implemented in a compact structure as a whole. . In addition, in the modifications of the first embodiment and the first embodiment, similarly to the second embodiment, the upper side of the pump bodies 110 and 210 are formed in the engine blocks 180 and 280 so as to shorten the exposed length of the pump motor ( VC) may be modified into a structure that is inserted into.

In the above exemplary embodiment, the water pump is illustrated as being integrally coupled to the engine block. However, the water pump may be separated from the engine block or integrally coupled to the radiator.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and the present invention is not limited to the spirit of the present invention. Various changes and modifications will be possible by those who have the same.

The present invention forms an area of the rotor chamber and the driver chamber and implements the integrated pump body by insert molding the stator and the connector, thereby improving the waterproof performance of the water pump and improving the assemblability by simplifying the assembly structure. It is applied to automobile water pump.

Claims (11)

A pump body having a stator and a connector formed in an integrated structure, and having a space for forming a rotor chamber and a driver chamber at an upper end and a lower end, respectively; A rotating assembly accommodated in the rotor chamber and configured to pressurize the coolant introduced from the outside by rotating the impeller coupled to the upper end of the rotating shaft by the rotation of the fixed rotating shaft; And And a driver cover covering the driver chamber. The water pump of claim 1, further comprising a pump cover coupled to the pump body to direct a coolant flow and forming a volute chamber for pressurizing the coolant by rotation of the impeller. 3. The water pump of claim 2, wherein the pump cover is inserted into the engine block. 4. The water pump of claim 3, wherein the engine block is directly coupled to the pump body to guide a flow of coolant and to form a volute chamber for pressurizing the coolant by the rotation of the impeller. The water pump of claim 1, wherein the pump body is molded by insert molding using a single material of polyphenylene sulfide (PPS) or BMC. The method of claim 5, wherein the rotor, the back yoke and the permanent magnet is fixed primarily by the rotor cover, and the outer circumference of the back yoke and the back yoke is wrapped by insert molding by BMC, characterized in that the second fixed Car water pump. [6] The water pump of claim 5, wherein the rotary assembly includes a bearing inserted at an upper and lower end thereof when the rotary assembly is coupled to the rotor chamber. The method of claim 1, The stator includes a stator core, wherein a portion of the stator core is exposed to the outside of the pump body. The water pump of claim 8, wherein the stator core is directly coupled to the engine block by forming a fastening hole through a portion exposed to the outside of the pump body. 10. The water pump of claim 9, wherein the engine block guides a coolant flow and forms a volute chamber that pressurizes the coolant by the rotation of the impeller. The motor of claim 8, wherein the stator core is formed with a through hole or an outer circumferential groove for filling the polyphenylene sulfide or the molding material of the BMC during the insert molding to be fixed to the pump body. Water pump.

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