JP2010121539A - Pump cover fastening structure in water pump, and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and rapidly perform assembly, to firmly fix a housing and a pump cover without using a fixture such as a bolt, and to ensure adequate assembly. <P>SOLUTION: This pump cover fastening structure in a water pump includes a housing 1, a pump cover 2, an impeller 5, and a stator core A with a core insulator surrounding a magnetic core, wound with a winding. Lock mechanisms B fitted to each other by rotation at an appropriate rotation angle are formed with respect to the outer peripheral surface 13 of the housing 1 and the inner periphery of the outer peripheral cylinder edge 22 of the pump cover 2, and a through-hole 11a formed at the top 11 of the housing 1 and an orifice formed on the lower surface of the circular plate-like cover part 21 of the pump cover 2 communicate with each other almost completely only when the locking of the lock mechanisms B is completed. Under this communicating state, a projection 75 formed on the stator core A is inserted into the through hole 11a and orifice. Sealing material 9 is filled so that the stator core A including an insertion part is buried in the housing 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention can be easily and quickly assembled, can firmly fix the housing and the pump cover without using any fixing tool such as bolts, and if the assembly can be performed, an appropriate assembly can be ensured. The present invention relates to a pump cover fastening structure in a water pump and a manufacturing method thereof.

  In recent years, in vehicles where the engine may stop during operation, such as hybrid vehicles and idling stop vehicles, an electric water pump is installed in addition to the main mechanical water pump for circulating cooling water when the engine is stopped. Things are being increased. Since improvement of fuel efficiency is one of the most important issues in hybrid vehicles, there is a strong demand for weight reduction in electric water pumps. For this reason, so-called covers, cases, housings, etc. of ordinary mechanical water pumps are often made of aluminum castings, but so-called covers, cases, housings, etc. of electric water pumps are mostly made of resin molded products.

  Also, the so-called pump cover (outer frame is made of resin) in which the pump part of the electric water pump is formed and the motor housing (outer frame is made of resin) in which the motor part is formed are often separate parts. After being manufactured on the line, it is assembled into one electric water pump, but the most widely used assembling method is a fastening method using bolts. However, the fastening with bolts has a problem that it takes time to assemble and the bolts themselves are heavy, which contradicts the demand for improving the fuel consumption by reducing the weight.

Furthermore, in the case of bolt fastening, the bolt fastening part (bolt seating surface) has a shape that protrudes larger than the electric water pump part, so the weight of not only the bolt but also the bolt fastening part (bolt seating surface) increases. In addition, the space (occupied volume) also increases. In addition, Patent Document 1 as a prior art discloses a technical content in an electric water pump in which the use of bolts, which has problems in terms of assembly man-hours, weight, and space as described above, is reduced from a plurality to one. Has been.
JP-A-6-58297

  As a method for fixing the motor 1 and the casing cover 4, a convex portion and a concave groove portion are provided in the rotation direction (circumferential direction) in each of the motor and the casing cover. By rotating the motor and the casing cover in opposite directions, the convex and concave grooves are engaged with each other, and the motor and the casing cover are fixed. The above-described fixing method is simply a fixing method such as a screw-type can and a bottle lid.

  However, as disclosed in Patent Document 1, the fixing method requires at least one bolt. This is because the motor and casing cover are rotated in opposite directions and the grooves are engaged with each other, so that they do not move relative to each other in the longitudinal direction, but rotate in the direction opposite to the rotational direction in which the motor and casing cover are tightened. This is because the motor and the casing cover are easily detached when moved. (Similar to the case where the can and the bottle lid are turned in the opposite direction.) Therefore, at least one bolt is required to prevent relative movement (rotation) of the motor and casing cover in the rotation direction. And

  To summarize the above contents, it is possible to reduce the number of bolts used in the electric water pump fixing method of Patent Document 1 to one, but at least one bolt is required. As is clear from FIGS. 2 and 9 of Patent Document 1, the portion where the bolt does not exist is circular, but the portion to which the bolt is attached has a substantially cylindrical protrusion larger than the bolt diameter as the bolt seat surface. Is essential. From the above, it cannot be said in Patent Document 1 that the problems relating to assembly time, weight, and space due to bolt fastening have been completely solved.

  For this reason, the problem (technical problem or purpose) to be solved by the present invention is to reduce the assembly time, reduce the weight, save space, and lower the product price. is there. This invention solves the above-mentioned subject, and provides the structure which can attain reduction of the assembly time in an electric water pump, weight reduction, and space saving.

  Accordingly, as a result of intensive research and researches to solve the above problems, the inventor has found that the cup-shaped partition wall portion is formed at the center of the annular top portion, and the outer peripheral surface portion is formed on the outer periphery of the top portion. Winding around a formed housing, a pump cover having an outer peripheral cylinder edge formed on the outer periphery of the disc-shaped cover portion, an impeller having an inner rotor magnet housed in the housing, and a core insulator that wraps the outer periphery of the magnetic core A lock mechanism that is formed by a stator core around which a wire is wound, and is fitted to an outer peripheral surface portion of the housing and an inner periphery of an outer peripheral cylinder edge of the pump cover by rotation of an appropriate rotation angle, and the housing So that the through-hole formed in the top of the pump and the hole formed in the lower surface of the disc-like cover portion of the pump cover are in a completely completely connected state only when the lock mechanism is locked. A projection formed on the stator core under this communication state is inserted into the through hole and the hole, and a sealing material is filled so that the stator core including the insertion portion is embedded in the housing. The above-mentioned problems have been solved by adopting a pump cover fastening structure in the water pump.

  According to a second aspect of the present invention, in the first aspect, the lock mechanism includes a plurality of lock pins on the outer peripheral surface portion of the housing, and an inner periphery of the outer peripheral cylinder edge of the pump cover corresponding to the plurality of lock pins. The above-described problems have been solved by providing a pump cover fastening structure in a water pump in which lock grooves that are fitted at an appropriate rotation angle are formed. According to a third aspect of the present invention, in the first or second aspect, an O-ring having elasticity is interposed between the top of the housing and the lower surface of the disc-shaped cover portion of the pump cover while being compressed. The above-described problem has been solved by adopting a pump cover fastening structure in the characteristic water pump. The invention of claim 4 is the pump cover fastening structure in the water pump according to any one of claims 1, 2, or 3, wherein the projection is formed integrally with the core insulator. The said subject was solved.

  According to a fifth aspect of the present invention, in any one of the second, third, and fourth aspects, the lock groove is substantially L-shaped, and includes a vertical insertion portion and an outer peripheral cylinder edge from an upper end of the insertion portion. The above-mentioned problem has been solved by providing a pump cover fastening structure in a water pump characterized in that the lateral groove portions are continuously formed facing the circumferential direction. The invention according to claim 6 is the pump cover fastening structure in the water pump according to claim 5, wherein a concave surface to which the lock pin is locked is formed at the end of the lateral groove portion of the lock groove. Thus, the above problem has been solved. According to a seventh aspect of the present invention, in any one of the first, second, third, fourth, fifth, and sixth aspects, the through hole formed in the top portion of the housing and the disc-shaped cover portion of the pump cover are formed. The pump cover in the water pump is characterized in that the hole portion is a long hole and has substantially the same shape, and the protrusion formed on the stator core is formed to have a slightly smaller diameter than the through hole or the hole portion. By adopting a fastening structure, the above problems have been solved.

  According to the invention of claim 8, a cup-shaped partition wall-shaped portion is formed at the center of the annular top, an outer peripheral surface is formed on the outer periphery of the top, and an outer peripheral cylinder edge is formed on the outer periphery of the disk-shaped cover A pump cover, an impeller having an inner rotor magnet housed in the housing, and a stator core having a winding wound around a core insulator that wraps around the outer periphery of the magnetic core, and the outer peripheral surface portion of the housing and the pump The inner periphery of the outer peripheral cylinder edge of the cover is fitted at an appropriate rotation angle, and the through hole formed in the top part of the housing and the hole part formed in the disk-like cover part of the pump cover are fitted. Only when the connection is completed, the stator core is made to be in a completely connected state, and a projection formed on the stator core is inserted into the through hole and the hole portion under the connected state. By was preparation of the pump cover fastening structure in a water pump, characterized in that filled with sealing material so as to fill in said housing is obtained by solving the above problems.

  According to the first aspect of the present invention, it is possible to reduce the time and weight of assembling the pump cover to the housing, to save space, and to reduce the product price. Specifically, there is not even one fixing tool such as a bolt, and there is an advantage that not only the assembly time can be reduced but also the weight can be reduced. In the invention of claim 2, the lock mechanism is a lock pin and a lock groove, so that a simple and reliable configuration can be achieved. In the invention of claim 3, since the elastic O-ring is interposed between the top of the housing and the lower surface of the disc-like cover portion of the pump cover, the lock mechanism is more reliably stopped. Can be configured. In the invention of claim 4, since the protrusion is integrally formed with the core insulator, the structure can be simplified and the structure can be made strong.

  In the invention of claim 5, the lock groove is substantially L-shaped, and the vertical insertion portion and the lateral groove portion are continuously formed from the upper end of the insertion portion toward the circumferential direction of the outer peripheral cylinder edge. As a result, it is possible to lock the movement in the thrust direction with a simple operation. In the invention of claim 6, since the end of the lock groove is formed as a concave surface, the locked state can be reliably maintained. In the invention of claim 7, the through-hole and the hole are substantially the same shape as a long hole, and the projection is formed to have a slightly smaller diameter than the through-hole or the hole, so that a strong configuration can be achieved. The sealing material can be satisfactorily filled and can be reliably fixed. In the invention of claim 8, when the electric water pump is assembled in this manufacturing method, the electric water pump can be correctly assembled, so that it is not necessary to confirm whether the electric water pump has been correctly assembled. There is an advantage that work labor can be greatly reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is composed of a housing 1 having a partition function in an electric water pump and a pump cover 2, and an outer stator core (electromagnet) A and an inner rotor magnet 5b are provided as the DC motor portion. Yes. The inner rotor magnet 5b is rotatably provided in the stator core. Cooling water is sealed between the inner rotor magnet 5 b and the housing 1. An impeller 5 is integrally formed on the upper portion of the inner rotor magnet 5b which is a member constituting the DC motor portion.

  The present invention relates to the housing 1, the pump cover 2, and the stator core, and the specific structure of the portion will be described in detail. The housing 1 is made of synthetic resin, and a portion having a partition function is provided on the upper surface side, and the outer peripheral side has a cylindrical shape. A top portion 11 as an annular disk, a partition-shaped portion 12 having a cup-shaped cross section from the inner peripheral position of the top portion 11, and a cylindrical outer peripheral surface portion 13 from the outer peripheral position of the top portion 11 are configured. The upper side of the outer peripheral surface portion 13 is referred to as an upper outer peripheral surface portion 13a. The upper outer peripheral surface portion 13a, the top portion 11 and the partition wall portion 12 constitute a stator housing portion 14 in which the doughnut-shaped stator core is housed.

  In the figure, reference numeral 15 denotes a top rising edge, and the inner periphery is formed as a slightly large-diameter cylindrical piece above the top 11. Further, a through hole 11 a into which a later-described stator protrusion 75 is inserted is formed at the outer peripheral portion of the top portion 11. An impeller and a shaft portion are disposed on the inner peripheral side of the partition wall-shaped portion 12, and are configured to function as a pump. Specifically, a boss portion 12b is formed above the central portion of the bottom surface 12a of the partition wall portion 12, and the metal impeller mounting shaft portion 12c is fixed to the boss portion 12b. The impeller mounting hole 5a is rotatably inserted into the shaft portion 12c.

  The pump cover 2 is made of a synthetic resin and has a lid shape whose center is expanded upward. A disk-shaped cover portion 21, an outer peripheral cylindrical edge 22 formed below the outer periphery of the disk-shaped cover portion 21, an impeller cover portion 23 that houses the impeller, a suction port 24, and a discharge port 25. Has been. The lock pins 3 are provided at three or four locations at substantially equal intervals on the outer peripheral surface of the upper outer peripheral surface portion 13a. Are formed (three or four).

  The housing 1 and the pump cover 2 are made of synthetic resin, but are required to have heat resistance, coolant resistance, and the like because of the portion where cooling water is present. On the lower surface of the disc-shaped cover portion 21, a concave groove-shaped hole portion 21a corresponding to the through hole 11a provided in the outer peripheral portion of the top portion 11 of the housing 1 is formed. The through-hole 11a and the hole 21a are circular or oblong (crucible) and have substantially the same shape, and are slightly larger in diameter than the protrusion 75 described later.

  The lock groove 4 is a portion that is fitted with the lock pin 3 and serves as a thrust (longitudinal direction) lock mechanism. The lock groove 4 has an L-shape, a vertical insertion portion 41, and the insertion portion 41. A lateral groove portion 42 is formed continuously from the upper end toward the circumferential direction (rotation direction) of the outer peripheral cylinder edge 22. The lateral groove 42 is formed upward by a slight angle θ (about several degrees). Further, a concave surface 42 a on which the lock pin 3 is locked is formed at the end of the lateral groove portion 42.

  Further, as shown in FIG. 3E, when the lock pin 3 is formed as a height h, the lock groove 4 has a U-shaped cross section when the inner surface of the outer peripheral cylinder edge 22 is considered as a horizontal plane. The depth h + α is slightly deeper than the height h. If the lock pin 3 has a simple cylindrical or square protrusion 75, no functional problem will occur. The above-described lock pin 3 and the lock groove 4 are collectively referred to as a lock mechanism B as a generic concept.

  The lock pin 3 and the lock groove 4 are provided in three or more locations on the circumference substantially equally. Here, assuming that three places are provided, it is preferable to arrange them slightly different from each other, not 120 degrees equally. This is to prevent the possibility of assembly with a 120 or 240 degree misalignment at equal intervals. That is, there is an advantage that the arrangement angles of the three locations on the circumference are not uniform so that the pump cover 2 and the housing 1 cannot be attached unless the angles are correct. That is, there is an advantage that the stator core A can be arranged at a correct position without requiring any labor.

  A storage groove 23 a for storing the top rising edge 15 and the O-ring 8 is formed at the lower end portion of the impeller cover portion 23 of the pump cover 2. Although the height of the storage groove 23a and the top rising edge 15 are equal, the height of the O-ring 8 is configured to be compressed and stored larger than this, and at this time, the O-ring 8 Due to the elastic force, the lock pin 3 fitted in the lock groove 4 is fitted into the concave surface 42a.

  The stator core (electromagnet) A is composed of a magnetic core 6 and a core insulator 7. The magnetic core 6 is composed of a steel plate laminated core or a sintered metal. In addition, as shown in FIG. 6C, the magnetic core 6 is configured as a set of six so as to form a circle. However, a plurality of the magnetic cores 6 may be four, eight, or twelve. is there. In this case, naturally, the same number of core insulators 7 is also provided. The core insulator 7 completely covers the entire magnetic core 6 and insulates the magnetic core 6. Such a core insulator 7 is made of synthetic resin.

  Reference numeral 75 denotes a protrusion, which is integrally formed so as to protrude on a top surface or a bottom surface of an appropriate portion of the core insulator 7 as shown in FIG. When six core insulators 7 are continuous, as shown in the figure, every other core is protruded. In addition, a coil wire m is wound around the constricted portion of the stator core A, and the N pole and the S pole are alternately excited adjacent to the inner peripheral surface 62a of the inner peripheral side piece 62 as a stator pole. Thus, it is configured as 6 poles.

  Next, assembly work will be described. First, the pump cover 2 is put on the housing 1 in a fixed state, and the insertion portion 41 of the lock groove 4 provided in the pump cover 2 is positioned with respect to the position of the lock pin 3 provided in the housing 1. The positions are matched in plan view [see FIG. 4A], the pump cover 2 is lowered as it is, the lock pin 3 is inserted into the insertion portion 41, and lowered until the lock pin 3 hits [ 4B, FIG. 5A and FIG. 5C]. At this time, the through hole 11a formed in the top portion 11 of the housing 1 and the hole portion 21a formed in the lower surface of the disc-like cover portion 21 of the pump cover 2 do not communicate completely [see FIG. ].

  Then, the pump cover 2 is rotated clockwise by an appropriate angle, and the lock pin 3 is inserted to the middle in the longitudinal direction in the lateral groove 42 [FIGS. 4 (C), 5 (D) and (F). reference]. Also at this time, the through hole 11a formed in the top portion 11 of the housing 1 and the hole portion 21a formed in the lower surface of the disc-like cover portion 21 of the pump cover 2 are not completely communicated with each other [FIG. )reference]. Further, the pump cover 2 is rotated clockwise by an appropriate angle, and the lock pin 3 is inserted to the end in the lateral groove portion 42 [see FIGS. 4D, 5G and I].

At this time, the lock pin 3 is engaged with the terminal concave surface 42 a in the lateral groove 42. At the same time, the through hole 11a formed in the top portion 11 of the housing 1 and the hole portion 21a formed in the lower surface of the disc-like cover portion 21 of the pump cover 2 are in a substantially complete communication state [FIG. reference]. “Substantially complete” is a concept including this value because a communication state is established even if there is an error of about 1 to 2 mm. Further, in this communication state, in particular, the cross section in the X ₄ -X ₄ direction in FIG. 5G in which the through hole 11 a and the hole 21 a are cross sections in the long hole direction is shown in FIG. (J) It is a cross section and is formed in the same length. In particular, the state in which the lock pin 3 is locked to the concave surface 42 a is held in a firmly fixed state by the elastic action of the O-ring 8.

  The action that can be strengthened will be described in detail. As shown in FIG. 4E, when the O-ring 8 is compressed and fixed, the pump cover 2 is moved upward by the elastic action of the O-ring 8. The housing 1 has a downward force. The upward force applied to the pump cover 2 serves to pull up the lock groove 4 provided on the pump cover 2 and lowers the lock pin 3 provided on the housing 1 downward. That is, since the lock pin 3 is lowered and the concave surface 42a of the lock groove 4 is pulled up, it is held in a firmly fixed state in that state [see FIG. 4D, FIG. 5G and FIG. ].

  This time, they are arranged upside down as shown in FIGS. 6 (A) and 6 (B). Then, the stator core A is inserted into the housing 1. Specifically, as shown in FIG. 6C, the projection 75 provided on the stator core A is on the lower side, and the projection 75 is in communication with the through hole 11a and the hole portion. It is inserted at a position 21a [see FIGS. 6D and 6E]. In this state, the locked state of the lock pin 3 and the lock groove 4 is maintained. In other words, the lock pin 3 and the lock groove 4 cannot be rotated in the reverse direction. As a result, the locked state is reliably maintained.

  Then, as shown in FIG. 7, the molten synthetic resin is poured into the space surrounded by the housing 1 and the stator core A. This synthetic resin is preferably a resin having high heat conductivity, but a synthetic resin suitable for the application is used. The molten synthetic resin is cured when the temperature is lowered, and becomes a sealing material 9 (sealing resin). As the injection hole for the sealing material 9, the through hole 11a may be used or provided separately from the through hole 11a. The sealing material 9 plays a role of heat transfer, waterproofing, dustproofing, vibration absorption and the like.

  The O-ring 8 plays a role of preventing the sealing material 9 from flowing out from the space surrounded by the housing 1 and the stator core A and preventing rainwater and mud from flowing from the outside. That is, if the O-ring 8 is not provided, as shown in FIG. 4E, the synthetic resin leaks from the gap between the housing 1 and the pump cover 2 when the synthetic resin melted from the left is poured. It also has an important role of preventing the sealing material 9 and the function of preventing the sealing material 9 from being eroded by rainwater and mud that have entered from the outside. In this way, the production is completed.

  In this invention, since a bolt is unnecessary, since both a bolt and a bolt fastening part can be made unnecessary, weight reduction and space saving can be achieved. Further, if the protrusion 75 of the core insulator 7 is integrally formed in the lock mechanism B, another member such as a bolt for the lock mechanism B can be eliminated at all. Further, the O-ring 8 having a function of sealing the pump portion of the electric water pump also has the function of preventing the thrust lock mechanism from being removed during the operation by the above-described elastic action. Therefore, the workability of the worker can be improved.

  Moreover, the position of the hole 21a of the pump cover 2 and the through hole 11a of the housing 1 are aligned only when the angle at which the thrust lock mechanism is correctly fixed is reached. When not aligned, the projection 75 of the core insulator 7 cannot be inserted and assembled. That is, unless the operator correctly assembles, the electric water pump of the present invention cannot be assembled. In other words, from a different perspective, if the electric water pump can be assembled, it can be correctly assembled. In other words, it is possible to eliminate the need for separately confirming whether the assembly has been performed correctly, and the manufacturing cycle time and labor can be greatly reduced. Further, a through hole 11a formed in the top portion 11 of the housing 1 and a hole portion 21a formed in the disc-like cover portion 21 of the pump cover 2 are long holes and have substantially the same shape, and the stator core A Since the projection 75 formed in this is formed in a slightly smaller diameter than the through hole 11a or the hole portion 21a, the sealing material 9 enters here, and can be firmly fixed without play.

(A) is the longitudinal cross-sectional view of this invention, (B) is the perspective view which decomposed | disassembled this invention product and excised one part. It is sectional drawing which decomposed | disassembled the main member of this invention. (A) is a cross-sectional view taken along the line PP in FIG. 2, (B) is a cross-sectional view taken along the line R ₁ -R ₁ in (A), and (C) is a cross-sectional view taken along the line R ₂ -R _{2 in} (A). a _R 3 -R ₃ sectional view taken along line, (E) is Q-Q palm plan view of FIG. 2 (D) is (a). (A) is a side view with a partial cross section in a state where the pump cover is to be set with respect to the housing. FIG. 4D is a side view in which the pump cover is partially set in a state where the pump cover is set with respect to the housing, and FIG. (A) is a plan view with a partial cross section of FIG. 4 (A) or (B), (B) is a cross-sectional view taken along arrow X ₁ -X ₁ of (A), and (C) is Y _{1 of} (A). -Y ₁ cross-sectional view, (D) is a plan view with a partial cross-section of FIG. 4 (C), (E) is a cross-sectional view of (D) taken along line X ₂ -X ₂ , and (F) is (D) ) Is a cross-sectional view taken along the line Y ₂ -Y ₂ , (G) is a plan view taken as a partial cross section of FIG. 4 (D), (H) is a cross-sectional view taken along the line X ₃ -X ₃ , (I) ) is _Y 3 -Y ₃ cross-sectional view along a line (G), (J) is the _X 4 -X ₄ cross-sectional view along a line (G). (A) is a cross-sectional view of a state in which the projection of the stator core is inserted into the through hole of the housing and the hole of the pump cover, (B) is an enlarged cross-sectional view of the main part of (A), and (C) is the entire stator core. A perspective view, (D) is a sectional view in which a protrusion of a stator core has been inserted into a hole between a through hole and a pump cover of a housing, and (E) is an enlarged sectional view of a main part of (D). (A) is a state diagram in which the synthetic resin (sealing material) melted in the final process of the present invention is poured into the housing, (B) is an enlarged sectional view of (A) part of (A), and (C) is (B). It is SS sectional view taken on the line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Housing, 11 ... Top part, 11a ... Through-hole, 12 ... Partition-like part, 13 ... Outer peripheral surface part,
2 ... pump cover, 21 ... disk-shaped cover part, 21a ... hole part, 22 ... outer peripheral cylinder edge,
B ... Lock mechanism, 3 ... Lock pin, 41 ... Insertion part, 42 ... Transverse groove part, 42a ... Concave surface,
5 ... impeller, 5b ... inner rotor magnet, 6 ... magnetic core, A ... stator core,
7 ... Core insulator, 75 ... Projection, m ... Winding, 8 ... O-ring, 9 ... Sealing material.

Claims (8)

  A housing in which a cup-shaped partition wall portion is formed at the center of the annular top portion, an outer peripheral surface portion is formed on the outer periphery of the top portion, a pump cover in which an outer peripheral cylindrical edge is formed on the outer periphery of the disc-shaped cover portion, An impeller having an inner rotor magnet housed in a housing, and a stator core having a winding wound around a core insulator that wraps around the outer periphery of the magnetic core. The inner periphery of the outer peripheral surface of the housing and the outer peripheral cylinder edge of the pump cover A lock mechanism that fits to the periphery by rotation at an appropriate rotation angle is formed, a through hole formed in the top of the housing, and a hole formed in the lower surface of the disc-like cover portion of the pump cover Is configured to be in a substantially completely connected state only when the lock mechanism is locked, and the protrusion formed on the stator core under the connected state has the through hole and the hole. Inserting the pump cover fastening structure in water pump sealing material such that said stator core, including the insertion point is embedded in the housing is characterized by comprising filled in.   2. The lock mechanism according to claim 1, wherein a plurality of lock pins are fitted on an outer peripheral surface portion of the housing at an appropriate rotation angle corresponding to the plurality of lock pins on an inner periphery of an outer peripheral cylinder edge of the pump cover. A pump cover fastening structure in a water pump, characterized in that a locking groove is formed.   3. A pump in a water pump according to claim 1, wherein an O-ring having elasticity is interposed between the top of the housing and the lower surface of the disc-like cover portion of the pump cover while being compressed. Cover fastening structure.   4. A pump cover fastening structure in a water pump according to claim 1, wherein the protrusion is formed integrally with the core insulator.   5. The lock groove according to claim 2, wherein the lock groove is substantially L-shaped, and faces a circumferential direction of the outer peripheral cylinder edge from a vertical insertion portion and an upper end of the insertion portion. A pump cover fastening structure in a water pump, characterized in that the lateral groove is formed continuously.   6. A pump cover fastening structure in a water pump according to claim 5, wherein a concave surface to which the lock pin is engaged is formed at an end of a lateral groove portion of the lock groove.   The through hole formed in the top part of the housing and the hole part formed in the disk-shaped cover part of the pump cover according to any one of claims 1, 2, 3, 4, 5, or 6. A pump cover fastening structure in a water pump, wherein the protrusions formed on the stator core are formed to have a slightly smaller diameter than the through hole or the hole.   A housing in which a cup-shaped partition wall portion is formed at the center of the annular top portion, an outer peripheral surface portion is formed on the outer periphery of the top portion, a pump cover in which an outer peripheral cylindrical edge is formed on the outer periphery of the disc-shaped cover portion, An impeller having an inner rotor magnet housed in a housing, and a stator core having a winding wound around a core insulator that wraps around the outer periphery of the magnetic core. The inner periphery of the outer peripheral surface of the housing and the outer peripheral cylinder edge of the pump cover The circumference is fitted at an appropriate rotation angle, and the through hole formed in the top portion of the housing and the hole formed in the disc-shaped cover portion of the pump cover are almost completely only when the fitting is completed. A projection formed on the stator core is inserted into the through hole and the hole under the communication state, and the stator core including the insertion portion is inserted into the housing. Preparation of the pump cover fastening structure in a water pump, characterized in that filled with sealing material so as to fill in.

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