JP2004225581A - Rotor for electric water pump and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor for an electric water pump of low component cost not requiring many manufacturing man-hours and capable of securing flow rate without preventing straightening, and a method for manufacturing the same. <P>SOLUTION: In the electric water pump including a rotor part 30 rotatably installed on a static shaft and an impeller part 40 connected to the rotor part 30 and rotated, rotating the rotor part 30 by rotating magnetic field generated by energization of a stator and rotating the impeller part 40 to pressure-feed water, the rotor part 30 having a cylindrical yoke 32 built in coaxially with the static shaft and filled with resin leaving an annular groove 36 of a neck part and a gap 33 of a finger strip 61 supporting the yoke 32 and the impeller part 40 which is filled with resin are connected as one body by filling the gap 33 and the annular groove 36 with resin. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotor used for an electric water pump integrally connected to an impeller section, and more particularly to a rotor for an electric water pump integrally connected to an impeller section.
[0002]
[Prior art]
Conventionally, this type of electric water pump rotor is as shown in FIG. 6 and FIG. According to this, in the rotor, the rotor portion 10 and the impeller portion 20 are separately manufactured, and the screw 21 coated with the screw locking agent is screwed into the threaded sleeve 11 embedded in the rotor portion 10 by insert injection molding. Let's be connected together.
[0003]
In addition, there are those as shown in FIGS. The rotor 10 and the impeller 20 are integrally injection-molded with a resin by inserting a cylindrical yoke 12 and connected to form a rotor. In order to support the yoke 12 with the mold, the left end periphery of the yoke 12 corresponding to the left blank portion in FIG. 8 is supported by a left mold (not shown). Are supported by adding three finger strips of the right type (not shown) for supporting the finger. In this state, injection molding is performed, and after opening the mold, the rotor can be taken out. In the rotor as this product, three extraction holes 13 for finger strips are formed in the flow path 15 between the blades 14 in FIG. Further, there is a type in which a permanent magnet is integrally formed but a space is formed below the blade (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP 2001-295797 A (FIG. 1)
[0005]
[Problems to be solved by the invention]
However, the conventional electric water pump rotor has the following problems. That is, in the former, the rotor part 10 and the impeller part 20 are separately manufactured, an adhesive is applied to the screw 21, and the two parts are fixed by using the adhesive. Is big. In the latter case, a turbulent flow is caused by the finger hole pull-out hole 13 formed in the flow path 15 between the blades 14 of the impeller section 20, and the flow rate is reduced. In Patent Document 1, a turbulent flow is generated by the space below the blade.
[0006]
Therefore, an object of the present invention is to provide a rotor for an electric water pump, which does not require a large number of manufacturing steps, has a small component cost, and can secure a flow rate without preventing rectification, and a method of manufacturing the rotor.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 has a rotor portion rotatably mounted on a fixed shaft, and an impeller portion connected to the rotor portion and rotated, and is supplied with electricity to the stator. An electric water pump rotor for rotating the rotor section with the generated rotating magnetic field, rotating the impeller section, and pumping water, in which a cylindrical yoke is incorporated coaxially with the fixed shaft and a finger supporting the yoke. The rotor portion formed by filling the resin with leaving the gap of the strip and the annular groove of the neck portion, and the impeller filled with the resin while the impeller portion is filled with the resin and the impeller by filling the gap and the annular groove with the resin. The electric water pump rotor is characterized in that the parts are integrally formed by a resin.
[0008]
According to the first aspect of the present invention, since there is no separate assembling work and a product is produced in the injection molding process, the number of manufacturing steps is reduced, the cost of parts is small, and rectification is prevented. Thus, it is possible to provide a rotor for an electric water pump that can secure a flow rate. Further, by filling the voids and the annular grooves with the resin, a detent effect and a detent effect are exhibited.
[0009]
According to a second aspect of the present invention, in the first aspect, the annular groove includes a communication groove communicating with the impeller and an engagement groove deeper than the communication groove. This is a pump rotor.
[0010]
According to the second aspect configured in this way, in addition to the effects of the first aspect, the integration can be performed more reliably.
[0011]
According to a third aspect of the present invention, in the first or second aspect, the rotor portion is formed integrally with a bearing that is rotatably inserted through the fixed shaft at a center portion and is disposed concentrically with the yoke. It is a rotor for an electric water pump.
[0012]
According to the third aspect of the present invention, in addition to the effects of the first and second aspects, the bearing can be integrated at the time of injection molding, and the cost can be further reduced.
[0013]
According to a fourth aspect of the present invention, in the method of manufacturing an electric water pump rotor according to any one of the first to third aspects, the recess is formed so as to form a part of the rotor part except one end peripheral edge from one end of the rotor part. A first mold having a projection portion corresponding to the fixed shaft at the center of the concave portion and a supporting portion for coaxially supporting the yoke at an end peripheral edge thereof; and an annular groove formed at the peripheral edge of the neck portion. And a plurality of divided second molds slidable to the first mold and at least three fingers that protrude in the axial direction relatively to the first mold and protrude in the axial direction to support the peripheral edge of the other end of the yoke at the tip. A first step of molding the rotor section having the gap and the annular groove using a third mold having a piece; a fourth mold for receiving the rotor section; and a fourth mold. And relatively move forward and backward to form most of the shape of the impeller section. A second step of filling the gap and the annular groove with a resin using a fifth die to form the impeller portion integrally with the rotor portion. It is a method of manufacturing a rotor.
[0014]
According to the fourth aspect of the present invention, since there is no separate assembling work and a product is produced in the injection molding process, the number of manufacturing steps is reduced, the cost of parts is small, and rectification is prevented. Thus, it is possible to provide a method for manufacturing a rotor for an electric water pump, which can secure a sufficient flow rate and further exhibit a detent and detent effect.
[0015]
According to a fifth aspect of the present invention, in the electric water heater according to the fourth aspect, the annular groove includes a communication groove communicating with the impeller and an engagement groove deeper than the communication groove. This is a method for manufacturing a pump rotor.
[0016]
According to the fifth aspect of the present invention, in addition to the effects of the fourth aspect, there is provided a manufacturing method capable of more surely integrating the components.
[0017]
According to a sixth aspect of the present invention, in the fourth or fifth aspect, the rotor portion is provided with a bearing rotatably inserted through the fixed shaft at the center thereof and concentrically with the yoke, and is integrally formed by insert injection molding. And a method for manufacturing a rotor for an electric water pump.
[0018]
According to the sixth aspect of the present invention, there is provided a manufacturing method capable of further reducing costs in addition to the effects of the fourth or fifth aspect.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a rotor for an electric water pump, FIG. 2 is an explanatory view of manufacturing a rotor portion using a mold, FIG. 3 is a right side view of the rotor portion, and FIG. FIG. 5 is a right side view of the rotor.
[0020]
As shown in the drawing, the rotor for an electric water pump according to the present invention includes a rotor portion 30 which is rotatably mounted on a fixed shaft (not shown) and an impeller portion 40 which is connected to the rotor portion 30 and rotated. It is configured.
[0021]
The rotor section 30 is provided with a bearing 31 rotatably mounted on a fixed shaft (not shown) at the center, a cylindrical yoke 32 arranged concentrically, and formed of resin so as to incorporate the yoke 30. An annular groove 36 is formed in the neck of the rotor unit 30, that is, in the outer periphery on the impeller 40 side. The annular groove 36 is composed of a communication groove 35 communicating with the impeller 40 and an engagement groove 34 deeper than the communication groove 35, and as shown in FIG. 2, is formed between the engagement groove 34 and the communication groove 35. There is no boundary, and there is no wall on the mounting side of the impeller section 40, forming a resin flow path.
[0022]
The impeller portion 40 is formed with spirally arranged blades 41, and on the opposite side, a skirt 42 digging into the rotor portion 30 from the outer periphery and three protruding portions 43 filling the gap 33 shown in FIG. 2. Is formed. The gap 33 is formed in a later-described manufacturing process of the rotor unit 30.
[0023]
That is, the rotor for the electric water pump has the cylindrical yoke 32 built in coaxially with the fixed shaft, and is filled with resin except for the gap 33 of the finger strip (described later) supporting the yoke 32 and the annular groove 36 at the neck. The rotor portion 30 formed as described above and the impeller portion 40 are filled with resin, the gap 33 and the annular groove 36 are filled with resin, and the impeller portion 40 is integrally connected with the resin.
[0024]
When such a rotor is mounted on an electric water pump, a rotating magnetic field generated by energizing a stator (not shown) rotates the rotor section 30, and thus the integral impeller section 40 rotates, and the blades 41 pump water. . Even if such a rotation operation is performed, the rotor section 30 and the impeller section 40 are separated by the skirt 42, or there is no relative loosening or rotation. In addition, the protrusion 43 prevents further relative rotation.
[0025]
Next, a method for manufacturing such an electric water pump rotor will be described. The first step will be described with reference to FIG. In the figure, reference numeral 50 denotes a first type, which is a concave portion 51 which forms most of the rotor portion 30 from one end while leaving a peripheral edge of the neck portion, and a protruding portion 52 and a yoke 32 corresponding to a fixed shaft are provided at the center of the concave portion 51. A supporting portion 53 is coaxially supported at the end peripheral edge 37.
[0026]
In addition, the second mold 70 is divided into a plurality of parts that can slide in the radial direction at a position where the second mold 70 is in contact with the first mold 50, here two pieces, and the inner peripheral edge 71 is formed in the annular groove 36 at the neck peripheral edge of the rotor part 30. Have a step-shaped cross-section to form. The third die 60 includes at least three finger strips 61 that are movable in the axial direction relative to the first die 50 and protrude in the axial direction, and support the other end peripheral edge 38 of the yoke 32 at the distal end. .
[0027]
A first step of forming the rotor section 30 having the gap 33 and the annular groove 36 using the first mold 50, the second mold 70, and the third mold 60 will be described. First, as shown by a two-dot chain line, the end periphery 37 of the yoke 32 is supported by the support portion 53 on the first mold 50. The two divided second molds 70 each having a semicircular inner periphery are brought into contact with the first mold 50 and are brought closer to each other to form a circle. Next, the third mold 60 is brought close to the first mold 50, and the second mold 70 is sandwiched between the molds. At this time, only one finger strip 61 of the third mold 60 can be seen in the figure, but three fingers are allocated on the circumference as appropriate, and the other end 38 of the yoke 32 is supported and the yoke 32 is supported. Is securely held. Further, the bearing 31 is inserted and mounted in the protruding portion 52.
[0028]
In this state, when the molten resin is injected from an injection device (not shown), the resin is filled in the space excluding the portion occupied by the yoke 32 and the bearing 31. When the mold is opened after waiting for the time for the resin to harden, the rotor section 30 shown in FIG. 2 is formed. Thus, the first step is completed.
[0029]
The second step is performed as follows. The fourth mold 80 is similar to the first mold 50 shown in FIG. 2 and has a shape for receiving the rotor unit 30. The fifth die 90 moves forward and backward relative to the fourth die 80 and forms most of the shape of the impeller section 40.
[0030]
The second step is performed using the fourth mold 80 and the fifth mold 90. First, the rotor unit 30 is inserted into the fourth mold 80 and clamped by the fifth mold 90. Thereafter, the molten resin is injected as described above, and the resin is filled up to the gap 33 and the annular groove 36 to form the impeller section 40 integrally with the rotor section 30. When the mold is opened and taken out after cooling, the rotor shown in FIG. 4 is obtained.
[0031]
【The invention's effect】
Products constructed or manufactured in this way do not require separate assembly work and produce products during the injection molding process, so there is no need for manufacturing man-hours, low component costs, etc. It is possible to provide a rotor for an electric water pump and a method for manufacturing the same, which can secure a flow rate and further exhibit a detent effect and a detent effect.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a rotor for an electric water pump according to the present invention.
FIG. 2 is an explanatory view of manufacturing a rotor unit using a mold.
FIG. 3 is a right side view of a rotor unit.
FIG. 4 is an explanatory view of manufacturing a rotor using a mold.
FIG. 5 is a right side view of the rotor.
FIG. 6 is a longitudinal sectional view of a conventional electric water pump rotor.
FIG. 7 is a right side view of the rotor of FIG. 6;
FIG. 8 is a longitudinal sectional view of another conventional electric water pump rotor.
FIG. 9 is a right side view of the rotor of FIG. 8;
[Explanation of symbols]
Reference Signs List 30 rotor part 32 yoke 33 gap 34 engagement groove part 35 communication groove part 36 annular groove part 40 impeller part 41 blade 42 skirt 43 protruding part 50 first mold 60 third mold 70 second mold 80 fourth mold 90 Type 5

Claims (6)

A rotor portion rotatably mounted on the fixed shaft; and an impeller portion connected to the rotor portion and rotated. The rotor portion is rotated by a rotating magnetic field generated by energizing a stator, and the impeller portion is rotated. In the rotor for the electric water pump that rotates and pumps water,
A cylindrical yoke is built in coaxially with the fixed shaft, the rotor portion formed by being filled with resin leaving a gap of a finger piece supporting the yoke and an annular groove of a neck portion, and the impeller portion. A rotor for an electric water pump, wherein the rotor is filled with resin, and the gap and the annular groove are filled with resin, and the impeller portion is integrally connected with the resin. 2. The electric water pump rotor according to claim 1, wherein the annular groove includes a communication groove communicating with the impeller and an engagement groove deeper than the communication groove. 3. 3. The electric water pump rotor according to claim 1, wherein the rotor portion is formed integrally with a bearing rotatably inserted through the fixed shaft at a central portion thereof, the bearing being arranged concentrically with the yoke. 4. . The method for manufacturing a rotor for an electric water pump according to claim 1,
A concave portion forming most of the rotor portion except for a peripheral edge of the neck portion, a projection portion corresponding to the fixed shaft, and a support portion for coaxially supporting the yoke at the peripheral edge at the center of the concave portion. A first mold, an annular groove formed in the periphery of the neck portion, a second mold divided into a plurality of pieces slidable in a radial direction, and a protruding axially movable relative to the first mold. A first step of molding the rotor portion having the gap and the annular groove by using a third mold having at least three finger pieces that support the other end of the yoke at the distal end. ,
The gap and the annular groove are formed by using a fourth mold that receives the rotor portion and a fifth mold that moves forward and backward relative to the fourth mold and forms most of the shape of the impeller portion. A second step of forming the impeller portion integrally with the rotor portion by filling the resin with the resin. 5. The method for manufacturing a rotor for an electric water pump according to claim 4, wherein the annular groove includes a communication groove communicating with the impeller and an engagement groove deeper than the communication groove. The electric motor according to claim 4 or 5, wherein the rotor portion is formed integrally by insert injection molding by arranging a bearing rotatably inserted through the fixed shaft at the center portion and concentrically with the yoke. A method for manufacturing a rotor for a water pump.

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