JP6562702B2 - Pump and pump manufacturing method - Google Patents

Description

  The present invention relates to a pump and a method for manufacturing the pump.

  2. Description of the Related Art Conventionally, a fuel pump that boosts fuel in a fuel tank and pumps it to an internal combustion engine is known. The fuel pump includes a casing, a motor provided in the casing, and a pump unit that is driven by the motor and provided in the casing. As a motor that is a driving source of the fuel pump, a brushless motor is used which can allow fuel to pass through the motor without providing a fuel flow path outside and can reduce the size of the fuel pump.

  A brushless motor does not slide between a commutator and a brush like a motor with a brush, is not easily affected by motor characteristics due to fluctuations in contact resistance, and does not cause a voltage drop in the commutator or brush. From this aspect, it is used for a fuel pump that is required to be small and highly efficient (see, for example, Patent Document 1 and Patent Document 2).

Japanese Patent Laying-Open No. 2005-110478 (page 3-4, FIG. 1) JP 2013-17303 A (page 5-6, FIG. 1-2)

  The efficiency of the fuel pump is the ratio of the amount of work (fuel discharge pressure) × (fuel discharge amount) that the fuel pump pumps fuel to the power supplied to the fuel pump. In the fuel pumps described in Patent Document 1 and Patent Document 2, the fuel discharged from the pump section passes through the gap between the stator and the rotor in the motor and is sent out from the discharge port.

  However, in the fuel pumps described in Patent Document 1 and Patent Document 2, the gap between the stator and the rotor is narrow and the cross-sectional area of the fuel flow path is small. There is a problem that it is necessary to increase the motor itself, and even if there is a margin in the output of the motor, it is necessary to employ a large motor in accordance with the required fuel discharge amount.

  The present invention has been made to solve the above-described problems, and it is possible to increase the amount of fuel discharged without increasing the motor by increasing the flow rate of fuel flowing in the motor. An object is to provide a small and highly efficient pump and a method for manufacturing the pump.

The pump according to this invention is
A housing, and an end cover disposed so as to close one of the openings in the axial direction of the housing;
A pump unit disposed in the housing so as to close the other opening of the housing, and sucking a liquid from outside to pump the liquid into the housing;
A motor disposed in the housing and driving the pump unit;
A discharge port for discharging the liquid pressurized above a predetermined pressure to the outside of the housing;
The motor includes a stator and a rotor disposed on an inner peripheral side of the stator,
The stator includes an annular yoke portion, an iron core including a plurality of tooth portions projecting inward from the yoke portion, coils wound around the tooth portions via insulating members, and the coil A coil mold that insulates from the liquid,
A first flow path formed in an axial direction of the stator between the outer peripheral surface of the rotor and the inner peripheral surface of the stator, and allowing the liquid to flow from the liquid suction side to the discharge side;
Another flow path that is located radially outward from the inner peripheral surface of the stator and radially inner from the outer peripheral surface of the yoke portion, and flows the liquid from the suction side to the discharge side of the liquid. ,
Between the outer peripheral surface of the coil mold and the inner peripheral surface of the yoke part, the liquid passes in the axial direction from the suction side to the discharge side; ,
Between the two coil molds formed in adjacent tooth portions, a slot hole that penetrates in the axial direction and forms a fourth flow path as the other flow path,
The fourth flow path communicates with the first flow path and the second flow path .
The pump according to the present invention is
A housing, and an end cover disposed so as to close one of the openings in the axial direction of the housing;
A pump unit disposed in the housing so as to close the other opening of the housing, and sucking a liquid from outside to pump the liquid into the housing;
A motor disposed in the housing and driving the pump unit;
A discharge port for discharging the liquid pressurized above a predetermined pressure to the outside of the housing;
The motor includes a stator and a rotor disposed on an inner peripheral side of the stator,
The stator includes an annular yoke portion, an iron core including a plurality of tooth portions projecting inward from the yoke portion, coils wound around the tooth portions via insulating members, and the coil A coil mold that insulates from the liquid,
A first flow path formed in an axial direction of the stator between the outer peripheral surface of the rotor and the inner peripheral surface of the stator, and allowing the liquid to flow from the liquid suction side to the discharge side;
Another flow path that is located radially outward from the inner peripheral surface of the stator and radially inner from the outer peripheral surface of the yoke portion, and flows the liquid from the suction side to the discharge side of the liquid. ,
The iron core includes a yoke portion hole that penetrates in the axial direction in the yoke portion radially outside the outer peripheral surface of the coil mold, and constitutes a third flow path as the other flow path,
The yoke portion has an axially extending fitting groove that fits a fitting portion formed on the outer circumference side of the teeth portion on an inner circumference, and the yoke portion hole is formed with the fitting groove. The fitting portion is provided on an extension line of a line segment that bisects the teeth portion in the circumferential direction.

The manufacturing method of the pump is as follows:
Teeth manufacturing process for manufacturing a tooth part, a coil winding process for concentrating the coil around the tooth part via the insulating member, and molding the coil and the insulating member after the coil winding process And a coil molding process.

  Since the pump and the method for manufacturing the pump according to the present invention are configured as described above, the first flow path of fuel formed in the outer peripheral surface of the rotor and the inner peripheral surface of the stator in the motor. In addition, by providing another fuel flow path penetrating in the axial direction, the fuel passing through the motor from the suction side to the discharge side can be increased. Thereby, it is not necessary to enlarge the motor, and even a fuel pump that requires a large discharge amount can be miniaturized.

It is a longitudinal cross-sectional schematic diagram of the fuel pump which concerns on Embodiment 1 of this invention. It is sectional drawing in the AA of the fuel pump of FIG. It is a front view of the division | segmentation laminated yoke part which concerns on Embodiment 1 of this invention, and a lamination | stacking teeth part. FIG. 3 is an enlarged view of a portion surrounded by a broken-line rectangle in FIG. 2. It is a cross-sectional schematic diagram in the state which put the lamination | stacking teeth part which wound the coil via the insulator in the mold die. It is sectional drawing in the CC line of FIG. It is sectional drawing of the fuel pump which concerns on Embodiment 2 of this invention. It is a figure which shows the structure of the core piece used for manufacture of the laminated core of the rotor core and stator which concern on Embodiment 2 of this invention. It is sectional drawing of the fuel pump which concerns on Embodiment 3 of this invention. It is a figure which shows the flow path of the fuel in the inside of the motor which concerns on Embodiment 3 of this invention. It is a figure explaining the manufacturing method of the coil mold which concerns on Embodiment 3 of this invention. It is sectional drawing of the fuel pump which concerns on Embodiment 4 of this invention.

Embodiment 1 FIG.
Hereinafter, a pump and a method for manufacturing the pump according to Embodiment 1 of the present invention will be described with reference to the drawings.
In this specification, “circumferential direction”, “radial direction”, “axial direction”, unless otherwise specified, the “circumferential direction”, “radial direction”, “ "Axial direction" shall be said. In addition, the side of the fuel pump that sucks fuel is referred to as “suction side”, and the side that discharges fuel is referred to as “discharge side”.

FIG. 1 is a schematic longitudinal sectional view of a fuel pump 100 according to Embodiment 1 of the present invention.
FIG. 2 is a cross-sectional view taken along line AA of the fuel pump 100 of FIG. 1, and shows a cross section of the main part of the motor 2. FIG. 1 is also a cross-sectional view taken along line BB in FIG.
As shown in FIG. 1, the fuel pump 100 includes a pump unit 3, a motor 2 that drives the pump unit 3, and a housing 4 that houses the motor 2 and the pump unit 3. For the housing 4, for example, a metal steel pipe is used. An end cover 7 is attached to the discharge side (upper side in FIG. 1) end of the housing 4 so as to close the end of the housing 4.

  The motor 2 is disposed on the discharge side in the axial direction of the housing 4 and includes a rotor 21 and a stator 20. The pump unit 3 is disposed on the suction side (lower side in FIG. 1) of the housing 4 while sharing the motor 2 and the rotation shaft 21a.

  The pump unit 3 is housed between the pump base 31 that closes the opening on the suction side of the housing 4, the pump cover 32 that forms a pump chamber paired with the pump base 31, and the pump base 31 and the pump cover 32. And an impeller 33 that pumps fuel introduced from the outside toward the motor 2 inside the housing 4.

  An end portion on the discharge side of the rotating shaft 21 a is pivotally supported by a bearing 61 attached to the center inside the end cover 7. The rotating shaft 21a is supported by a bearing 62 attached to the center of the pump cover 32 on the suction side. The impeller 33 is fixedly attached to a rotating shaft 21a that passes through the bearing 62 and protrudes toward the suction side. When the rotating shaft 21a rotates, the impeller 33 rotates in conjunction with the rotating shaft 21a.

  The pump base 31 is provided with a suction port 34 for sucking fuel into the fuel pump 100. In addition, a pump portion flow path 35 that is recessed in the axial direction and has a semicircular cross section is formed on each of the surface of the pump base 31 that faces the impeller 33 and the surface of the pump cover 32 that faces the impeller 33. ing. Further, the pump cover 32 is provided with a pump part discharge port 36 for discharging fuel from the pump part flow path 35 to the motor 2 side. Although details of the impeller 33 are not shown, the pump unit 3 pumps the fuel sucked from the suction port 34 by the rotation of the impeller 33 into the housing 4.

A brushless motor is used as the motor 2 of the fuel pump 100. As shown in FIGS. 1 and 2, the motor 2 includes a rotor 21 and a stator 20.
The rotor 21 includes a rotating shaft 21a and a cylindrical permanent magnet 21c fitted around the rotating shaft 21a. The rotor 21 is rotatably disposed with a predetermined gap G1 between the outer peripheral surface 21OUT of the rotor 21 and the inner peripheral surface 20IN of the stator 20.

  The end cover 7 of the fuel pump 100 is provided with a discharge port 71 that discharges fuel from the inside to the outside of the fuel pump 100, and the discharge port 71 is provided with a check valve 73 that prevents backflow of fuel. The check valve 73 includes a valve 73a and a spring 73b. When the fuel in the fuel pump 100 boosted by the pump unit 3 reaches a predetermined pressure or higher, the spring 73b contracts and the valve 73a moves upward in FIG. It is discharged outside.

  A power supply terminal 72 that supplies power to the stator 20 from the outside of the fuel pump 100 passes through the end cover 7 and is connected to the stator 20.

  As shown in FIGS. 1 and 2, the laminated core 22 of the stator 20 is divided into a divided laminated yoke part 22a1 obtained by dividing the annular laminated yoke part into nine equal parts, and a central part in the circumferential direction of each divided laminated yoke part 22a1. And 9 laminated tooth portions 22a2 which are fitted in the axial direction and project inward in the radial direction of the divided laminated yoke portion 22a1. A coil 22b molded with an insulating member is wound around each laminated tooth portion 22a2. A divided laminated iron core 22a is formed by fitting one laminated tooth portion to one divided laminated yoke portion 22a1. In other words, a product obtained by annularly combining nine divided laminated iron cores 22a is a laminated iron core 22, and a product obtained by winding a coil 22b around each laminated tooth portion 22a2 and molding a portion of the coil 22b. It is. The radial width of the divided laminated yoke portion 22a1 is designed so that the magnetic flux passing through this portion does not become magnetically saturated in accordance with the characteristics of the motor 2.

FIG. 3 is a front view of the divided laminated yoke portion 22a1 and the laminated tooth portion 22a2.
4 is an enlarged view of a portion surrounded by a broken-line rectangle in FIG. A symbol O in FIG. 4 indicates the rotation center of the rotation shaft 21a. As shown in FIG. 3, each divided laminated yoke portion 22a1 has a fitting groove M extending in the axial direction at the center of the inner periphery, and each laminated tooth portion 22a2 is a fitting provided on the outer peripheral side. Part K. A groove H11 and a groove H12 each having a semicircular cross section perpendicular to the axial direction are provided at the joint between the fitting groove M of the divided laminated yoke portion 22a1 and the fitting portion K of the laminated tooth portion 22a2. The split laminated iron core 22a is configured by fitting the fitting portion K in the fitting groove M in the axial direction.

  Further, a yoke portion hole H1 penetrating in the axial direction is constituted by the groove H11 and the groove H12 at the joint portion between the divided laminated yoke portion 22a1 and the laminated tooth portion 22a2. This yoke portion hole H1 is disposed at a position that is the center of the circumferential dimension of the laminated tooth portion 22a2 (a position where L1 = L2 in FIG. 4). Moreover, it arrange | positions so that the distance from the innermost part of the yoke part hole H1 and the rotation center O of the rotating shaft 21a may become larger than the internal diameter r1 (except for the fitting groove M part) of the division | segmentation laminated yoke part 22a1. The reason why the yoke hole H1 is arranged at this position is that the magnetic flux entering the stator 20 from the rotor 21 is divided on both sides in the circumferential direction by the divided laminated yoke portion 22a1, and therefore the laminated tooth portion 22a2 in the divided laminated yoke portion 22a1. This is because the portion corresponding to the outer peripheral side of the extended line segment that bisects the line in the circumferential direction (L1 = L2) is unlikely to be a magnetic path. Therefore, even if the yoke hole H1 is opened at this position, the width of the magnetic path is not reduced, so that the influence on the characteristics of the motor 2 is small.

  The coil 22b is intensively wound around each laminated tooth portion 22a2 via the insulating insulator 8 (concentrated winding). The insulator 8 electrically insulates between the laminated tooth portion 22a2 and the coil 22b.

Next, the coil 22b and the coil mold 22c that insulates the fuel to be pumped will be described.
The coil mold 22c shown in FIG. 1 covers a part of the laminated tooth portion 22a2 (described later) and the periphery of the coil 22b with an insulating member (for example, thermoplastic resin: POM (polyacetal), PPS (polyphenylene sulfide), etc.).

  As shown in FIG. 4, the outer diameter r2 of the coil mold 22c is smaller than the inner diameter r1 of the divided laminated yoke portion 22a1 (r2 <r1), and the inner peripheral surface 22a1IN of the divided laminated yoke portion 22a1 and the coil mold are formed. A gap G2 is formed between the outer peripheral surface 22cOUT of 22c. For example, when the size of the gap G2 is the same as that of the gap G1, the distance of the gap G2 from the rotation center 0 of the rotation shaft 21a is longer than the distance of the gap G1 from the rotation center O of the rotation shaft 21a. The sectional area perpendicular to the axial direction of the gap G2 is larger than the sectional area perpendicular to the axial direction of the gap G1.

  The coil mold 22c does not block the yoke portion hole H1. The position of the yoke portion hole H1 is located on the radially outer side than the position of the outer peripheral surface 22cOUT of the coil mold 22c. For this reason, even if the coil 22b is molded, the yoke member hole H1 is not blocked by the molding member, and the yoke member hole H1 penetrates in the axial direction. The coil 22b wound around the adjacent laminated tooth portions 22a2 is also molded by the coil mold 22c.

  By configuring the stator 20 in this way, the fuel sucked and pressurized into the housing 4 by the pump unit 3 is the outer peripheral surface 21OUT of the rotor 21 and the inner periphery of the stator 20 (laminated tooth portion 22a2). Dispersed in the gap G1 (first flow path) formed between the surface 20IN, the gap G2 (second flow path) and the yoke hole H1 (third flow path) described above, the interior of the motor 2 is Pumped from the suction side to the discharge side. Thereby, even if the gap G1 is set to be small, a sufficient fuel flow path can be secured, so that the magnetic resistance between the permanent magnet 21c and the laminated tooth portion 22a2 can be suppressed, and it is possible to contribute to higher efficiency of the motor 2.

Next, a method for manufacturing the fuel pump 100 will be described.
First, each core piece constituting each lamination of the divided laminated yoke portion 22a1 and laminated tooth portion 22a2 of the divided laminated iron core 22a is punched out from a thin plate made of a magnetic material. Then, by laminating a predetermined number of these, nine divided laminated yoke portions 22a1 and nine laminated tooth portions 22a2 are manufactured (tooth portion, yoke portion manufacturing process). Next, the coil 22b is intensively wound around each laminated tooth portion 22a2 via the insulator 8 (coil winding step).

  At this time, since the laminated tooth portion 22a2 is not yet fitted to the divided laminated yoke portion 22a1, the coil 22b can be individually wound around each laminated tooth portion 22a2, so that the workability of the winding work of the coil 22b is good. . In addition, a space for arranging the winding device can be easily secured. Thereby, the space factor of the coil 22b can be improved and the density of the coil 22b can be increased.

Next, a method for manufacturing the coil mold 22c will be described.
FIG. 5 is a schematic cross-sectional view in a state where the laminated tooth portion 22a2 around which the coil 22b is wound via the insulator 8 is placed in a mold, and is a cross-sectional view perpendicular to the axial direction.
6 is a cross-sectional view taken along the line CC of FIG.
The coil mold 22c is manufactured by covering a part of the laminated tooth portion 22a2 and the periphery of the coil 22b with an insulating member (for example, thermoplastic resin: POM, PPS, etc.).
First, the insulator 8 that electrically insulates the laminated tooth portion 22a2 and the coil 22b is attached to the outer peripheral surface of the portion around which the coil 22b of the laminated tooth portion 22a2 is wound. Next, a total of nine laminated tooth portions 22a2 around which coils 22b are wound from above the insulator 8 are annularly attached to the first mold 9a, and the second mold 9b is placed thereon. The inner peripheral surface of the laminated tooth portion 22a2 is brought into contact with the outer peripheral surface 9a1 of the first inner mold 9a, and the fitting portion of the laminated tooth portion 22a2 is brought into contact with the inner peripheral surface 9b1 of the outer second mold 9b. Each laminated tooth part 22a2, the first mold 9a, and the second mold 9b are positioned by bringing the outer peripheral surface of K into contact.

  Next, resin as an insulating member is injected into a space formed between the first mold 9a and the second mold 9b from an injection port (not shown) and solidified. At this time, the portion covered by the coil mold 22c is the entire circumference of the coil 22b and the entire outer surface of the insulator 8 except for the surface where the insulator 8 is in contact with the laminated tooth portion 22a2 (the coil 22b is wound). Except the part).

  In a state of being placed in the first mold 9a and the second mold 9b, between the inner peripheral surface 8IN and the outer peripheral surface 8OUT of the insulator 8 and the first mold 9a and the second mold 9b. As shown in FIG. 6, gaps S1 to S4 are formed, respectively. Therefore, the resin filled between the first mold 9a and the second mold 9b covers all the exposed portions of the outer peripheral portion of the coil 22b, the inner peripheral surface 8IN and the outer peripheral surface 8OUT of the insulator 8, and the like. Along the inner peripheral surface 8IN of the insulator 8 the entire circumference of the edge F of the radial tip of the laminated tooth portion 22a2 and a predetermined length of the laminated tooth portion 22a2 along the outer peripheral surface 8OUT of the insulator 8 over the entire circumference. It will cover with the width of.

  In the present embodiment, since the coil mold 22c is formed before the divided laminated yoke portion 22a1 is fitted to the laminated tooth portion 22a2, the coil mold 22c is not interfered with the inner peripheral surface of the divided laminated yoke portion 22a1. Can be easily positioned and molded by the first mold 9a and the second mold 9b.

  As shown in FIGS. 5 and 6, only the laminated tooth portion 22a2 is placed in the first die 9a and the second die 9b, and both end surfaces in the axial direction of the fitting portion K on the outer peripheral side of the laminated tooth portion 22a2 are Since the first mold 9a and the second mold 9b are closed, no resin enters the yoke hole H1, and the yoke hole H1 is not blocked.

  After forming the coil mold 22c, the divided laminated yoke is taken out from the fitting portions K of the nine laminated tooth portions 22a2 taken out from the first mold 9a and the second mold 9b and integrated by the coil mold 22c. The fitting grooves M of the portions 22a1 are fitted and fixed one by one in the axial direction. The stator 20 thus manufactured is press-fitted or inserted into the housing 4 from the discharge side and fixed by shrinkage fitting.

Next, the pump cover 32 is fixed in the housing 4 by press fitting or shrink fitting the outer peripheral surface of the pump cover 32 and the inner peripheral surface of the housing 4.
Next, the rotor 21 held by the rotating shaft 21 a is inserted into the inner peripheral side of the stator 20, and one end of the rotating shaft 21 a is passed through the bearing 62.
Next, the end cover 7 is set on the discharge side of the housing 4, and the other end side of the rotary shaft 21a is passed through the bearing 61, and the axial end of the housing 4 is processed by caulking to 4 is closed.
Next, the impeller 33 is fixed to the rotating shaft 21a.

  Next, the pump base 31 is inserted into the suction side end of the housing 4 so as to cover the impeller 33, the outer peripheral surface of the suction side end of the housing 4 is processed by caulking, and the suction side end of the housing 4 is processed. Close the opening. In this way, the fuel pump 100 is manufactured.

Next, the operation of the fuel pump 100 will be described.
First, when the motor 2 is operated, the impeller 33 rotates in conjunction with the rotating shaft 21a, and fuel is sucked from the suction port. The sucked fuel is boosted in the pump section flow path 35 and is pumped from the pump section discharge port 36 to the motor 2 side.

  Next, the fuel sent to the suction side of the motor 2 is the above-mentioned gap G1 (first flow path), gap G2 (second flow path), and yoke hole H1 (the fuel flow path in the motor 2). Flows to the discharge side of the motor 2 through the third flow path) and is sent out from the discharge port 71 to, for example, an engine or the like.

  According to the fuel pump 100 and the method for manufacturing the fuel pump 100 according to the first embodiment of the present invention, the second flow path and the third flow path for the fuel are provided in the motor 2, thereby sucking the motor 2. The amount of fuel passing from the side to the discharge side can be increased. Thereby, it is not necessary to enlarge the motor 2, and the fuel pump 100 that requires a large discharge amount can be downsized.

  Further, even if the gap G1 (first flow path) between the inner peripheral surface 20IN of the stator 20 and the outer peripheral surface 21OUT of the rotor 21 is narrowed, the fuel required by the other second flow path and third flow path. The cross-sectional area of the channel can be secured. By narrowing the gap G1, the magnetic flux of the permanent magnet 21c can be used effectively, so that the motor 2 with higher efficiency can be provided, and as a result, the fuel pump 100 can be made highly efficient.

The ratio of the flow path cross-sectional area of the fuel according to the present embodiment is shown below with reference to the first flow path.
Assuming that the first flow path is 100% (reference), when the radial width of G1 = the radial width of G2, the second flow path has a cross-sectional area of 167%, and the third flow path is approximately 46%. %. Accordingly, the total of the first flow path + second flow path + third flow path is 313%, and a fuel discharge amount of three times or more can be secured as compared with the case of only the first flow path.

  Further, since the divided laminated iron core 22a is divided into the divided laminated yoke portion 22a1 and the laminated tooth portion 22a2, the coil mold 22c is obtained after the coil 22b is wound around the laminated tooth portion 22a2 (without the divided laminated yoke portion 22a1). Can be formed. For this reason, positioning of the lamination | stacking teeth part 22a2 in the 1st metal mold | die 9a and the 2nd metal mold | die 9b becomes easy, and the workability | operativity of a coil molding process improves.

  Further, since the laminated tooth portions 22a2 are divided one by one, the coil teeth 22b are wound in a state in which the laminated tooth portions 22a2 that are adjacent to each other when the stator 20 is assembled are separated from each other. The work can be performed, and the workability in the winding process of the coil 22b is also good. In addition, a space for arranging the winding device can be easily secured. Thereby, many coils 22b can be wound at once, or the coil 22b with a larger cross-sectional area can be wound, and the coil 22b of the stator 20 can be densified. Moreover, since the coil 22b is covered with the coil mold 22c, the deterioration of the coil 22b due to the fuel component can be suppressed.

  Further, the fuel passing through the first flow path receives a force due to the rotation of the rotor 21 and flows in a spiral manner in the axial direction, which affects the efficiency of the motor. The road is not affected by the rotational force of the rotor and has the effect of not impairing the efficiency of the motor.

  In the present embodiment, the inner circumferential surface of the divided laminated yoke portion 22a1 and the outer surface of the coil mold 22c have been described as curved surfaces. However, the curved surfaces are not necessarily curved, and for example, have a planar shape facing the rotating shaft 21a. May be. Further, only one of the second flow path and the third flow path may be provided. Further, although the fuel pump has been described as an example, the present invention can be applied to any medium as long as it is liquid.

Embodiment 2. FIG.
Hereinafter, the pump according to the second embodiment of the present invention and the method for manufacturing the pump will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 7 is a cross-sectional view of the fuel pump 200. This corresponds to FIG. 2 of the first embodiment. The cross section parallel to the axial direction is the same as that of FIG.

  The difference between the fuel pump 100 according to the first embodiment and the fuel pump 200 according to the present embodiment is the configuration of the laminated yoke portion 222a1 and the configuration of the rotor 221. In the present embodiment, the laminated yoke portion 222a1 is not divided equally in the circumferential direction and is integrated. The rotor 221 has a rotor core 21b between the rotating shaft 21a and the permanent magnet 21c. In FIG. 7, reference numerals are given only to main constituent members and constituent parts different from those in FIG. 2.

  The rotor core 21b is configured by laminating the same number of thin plates having the same thickness as the core pieces of the laminated core 222 of the stator 220. A rotating shaft 21a is press-fitted and fixed inside the rotor core 21b. A cylindrical permanent magnet 21c is fixed to the outer peripheral surface of the rotor core 21b by adhesion.

  FIG. 8 is a diagram illustrating a configuration of an iron core piece used for manufacturing the laminated iron core 222 of the rotor iron core 21 b and the stator 220. The yoke core piece 51, the teeth core piece 52, and the rotor core piece 53 are punched out from the thin hoop material 5 in an arrangement that is substantially the same as that of the motor 2, and a plurality of these are respectively provided. By laminating, the laminated yoke portion 222a1, the laminated tooth portion 222a2, and the rotor core 21b are manufactured. At this time, the number of laminated core pieces of the three types is the same and is punched from the same hoop material 5, so that the laminated yoke portion 222a1, the laminated tooth portion 222a2, and the rotor iron core 21b all have the same axial length. Become.

  According to the fuel pump 200 and the method for manufacturing the fuel pump 200 according to the second embodiment of the present invention, in addition to the effects of the first embodiment, after the coil mold 22c is formed, the fitting portion K of the laminated tooth portion is formed. When fitting into the fitting groove M2 of the laminated iron core 222, since the laminated yoke portion 222a1 is integral, the handling is only required once and the workability is improved. Further, since the laminated core 222 and the rotor core 21b of the stator 220 can be formed by punching from the same hoop material 5, the amount of use of the hoop material 5 is reduced as compared with the case where each core piece is punched from different materials. can do. Moreover, it is only necessary to punch out with one mold, and the number of molds can be suppressed and the number of presses can be reduced as compared with the case of punching individually.

Embodiment 3 FIG.
Hereinafter, the pump according to the third embodiment of the present invention and the method for manufacturing the pump will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 9 is a cross-sectional view of the fuel pump 300. This corresponds to FIG. 2 of the first embodiment. Although the cross section parallel to the axial direction is slightly different from the actual configuration, it is the same as FIG.

FIG. 10 is a view showing a fuel flow path inside the motor of the fuel pump 300.
FIG. 11 is a diagram illustrating a method for manufacturing the coil mold 322c.
Fig.11 (a) is sectional drawing perpendicular | vertical to the axial direction of the lamination | stacking teeth part 322a2 (state before a mold) after coil 22b winding.
FIG. 11B is a schematic cross-sectional view perpendicular to the axial direction in a state where the laminated teeth portion 322a2 after winding the coil 22b is put in the first molds 309a and 309b for molding.
FIG. 11C is a cross-sectional view perpendicular to the axial direction of the laminated tooth portion 322a2 after the coil 22b is molded.

  The difference between the fuel pump 100 according to the first embodiment and the fuel pump 300 according to the present embodiment is that the shape of the coil mold 322c, the position of the yoke hole H2, the configuration of the fuel flow path, and the coil mold This is a manufacturing method of 322c.

  First, the shape of the coil mold 322c will be described. As shown in FIG. 11 (c), the coil mold 322c covers a part of the laminated tooth portion 322a2 (same as in the first embodiment) and the periphery of the coil 22b with an insulating member (for example, thermoplastic resin: POM, PPS, etc.). Yes.

  Similar to the first embodiment, the outer diameter r2 of the coil mold 322c is formed smaller than the inner diameter r1 of the divided laminated yoke portion 322a1 (r2 <r1), and the inner peripheral surface 322a1IN of the divided laminated yoke portion 322a1 and the coil mold are formed. A gap G2 (second flow path) is formed between the outer peripheral surface 322cOUT of 322c.

  Unlike Embodiment 1, separate coil molds 322c are formed on the two coils 22b wound around the adjacent laminated tooth portions 322a2, and a slot portion that penetrates between the adjacent coil molds 322c in the axial direction. A hole H3 is formed. The inner peripheral side of the slot hole H3 communicates with the gap G1 (first flow path in the first embodiment). In addition, the outer peripheral side of the slot hole H3 communicates with the gap G2 (second flow path).

  Next, the position of the yoke portion hole H2 will be described. In the first embodiment, grooves H11 and H12 each having a semicircular cross section perpendicular to the axial direction are provided at the joint between the fitting groove M of the divided laminated yoke portion 22a1 and the fitting portion K of the laminated tooth portion 22a2. In this embodiment, the yoke hole H1 is configured. However, in the present embodiment, a yoke part hole H2 having a round cross section perpendicular to the axial direction is provided between the outer peripheral surface and the inner peripheral surface of the divided laminated yoke portion 322a1. did.

  Next, the overall shape of the fuel flow path will be described. A portion indicated by hatching in FIG. 10 is a fuel flow path. In addition to the gap G1 (first flow path), the gap G2 (second flow path), and the yoke hole H2 (third flow path) that is different in position from the yoke hole H1 described in the first embodiment, the gap A slot hole H3 (fourth flow path) is provided between the G1 and the gap G2 in the radial direction, and the first flow path and the second flow path are connected in the radial direction by the fourth flow path. The first, second, and fourth flow paths all penetrate in the axial direction. In the first embodiment, the coil 22b wound around the adjacent laminated tooth portion 22a2 is completely sealed with the mold resin, but in this embodiment, the slot portion hole H3 is formed in that portion. Will be.

Next, a method for manufacturing the coil mold 322c will be described.
In the first embodiment, all the coils 22b wound around all the laminated tooth portions 22a2 are put into a mold and molded at the same time. However, in this embodiment, the coils 22b are molded one by one. First, as shown to Fig.11 (a), after attaching the insulator 8 to the lamination | stacking teeth part 322a2, the coil 22b is concentratedly wound. Next, as shown in FIG. 11B, one laminated tooth portion 322a2 after winding the coil 22b is divided into a first mold 309a which is an inner mold for coil molding and a second mold 309b which is an outer mold. Install in. The laminated tooth portion is obtained by bringing the inner peripheral surface of the laminated tooth portion 322a2 into contact with the outer peripheral surface of the first mold 309a and bringing the fitting portion K3 of the laminated tooth portion 322a2 into contact with the inner peripheral surface of the second die 309b. 322a2, the first mold 309a, and the second mold 309b are positioned.

  Further, in order to form the slot hole H3, both side surfaces in the circumferential direction of the coil 22b are covered with the side surface portion 309bs of the second mold 309b with a space for molding, and the inner periphery of the second mold 309b is covered. The surface 309bIN is in contact with the outer peripheral surface 309aOUT of the first mold 309a. In this state, an insulating resin is poured between the first mold 309a and the second mold 309b, whereby the coil mold 322c that covers a part of the coil 22b and the laminated tooth portion 322a2 can be manufactured.

  In the present embodiment, the plurality of laminated tooth portions 322a2 after winding the coil 22b are not put into a mold for molding, but the laminated teeth portions 322a2 are inserted into the mold die one by one and molded. It was. Thereby, since it can manufacture and use the metal mold | die for molding, irrespective of the space | interval of lamination | stacking tooth | gear part 322a2 which becomes adjacent when it becomes the stator 320, the 1st metal mold | die 309a, the 2nd metal mold | die The shape of each of the molds 309b can be simplified, and the attachment property of the laminated tooth portion 322a2 is also good.

  That is, if a hole such as the slot hole H3 of the present embodiment is provided in the center of the slot portion in the state of FIG. 5 of the first embodiment, it is connected in the radial direction between the outer mold and the inner mold. This spacer member is arranged, but it is necessary to carefully insert the spacer member into the slot so that the spacer member and the coil 22b wound around each laminated tooth portion 22a2 do not interfere with each other. is there.

  As shown in FIG.11 (c), the outer peripheral surface 322cOUT of the coil mold 322c is formed inside radial direction rather than the fitting part K3 of the lamination | stacking teeth part 322a2. 9 is obtained by fixing nine divided stators 320b in which the laminated tooth portion 322a2 in which the coil 22b is molded and the divided laminated yoke portion 322a1 are fitted into the housing 4 in an annular manner.

  Thus, in the state where the divided stators 320b are arranged in a ring and fixed in the housing 4, the slot hole H3 is formed between the circumferential side surfaces of the two adjacent coil molds 322c. Thereafter, the fuel pump 300 is assembled by the same method as in the first embodiment.

  According to the fuel pump 300 and the method of manufacturing the fuel pump 300 according to the third embodiment of the present invention, in addition to the effects of the first embodiment, the slot hole H3 can be used as a flow path, and the fuel discharge The amount can be further increased. In the first embodiment, the portion corresponding to the slot portion hole H3 is entirely filled with mold resin. However, by using the central portion of this portion as a fuel flow path, there is no need to enlarge the motor 2. In addition, it is possible to provide a fuel pump 300 that can have a large discharge amount and a small size.

  Moreover, since the coil mold 322c can be formed in units of individual laminated tooth portions 322a2, the mold for molding the laminated tooth portion 322a2 after the coil 22b is wound can be simplified, and the workability of the coil molding process can be improved.

  Further, the fuel passing through the first flow path affects the rotation of the rotor 21 as described above, but in the present embodiment, the first flow path, the second flow path, and the fourth flow path are in communication. Therefore, the fuel swirled by the rotation of the rotor 21 flows from the fourth flow path into the second flow path due to the centrifugal force. Therefore, the effect that the fuel that passes through the first flow path inhibits the rotation of the rotor 21 can be alleviated. There is.

Embodiment 4 FIG.
Hereinafter, the pump according to the fourth embodiment of the present invention and the method for manufacturing the pump will be described with reference to the drawings, focusing on the differences from the first and second embodiments.
FIG. 12 is a cross-sectional view of the fuel pump 400. This corresponds to FIG. 2 of the first embodiment.

  The difference between fuel pumps 100 and 200 according to the first and second embodiments and fuel pump 400 according to the present embodiment is that the outer periphery of the outer peripheral surface of coil mold 422c covers the periphery of laminated tooth portion 22a2. The surface is in contact with the inner peripheral surface 422a1IN of the laminated yoke portion 422a1 by a predetermined range by the contact portion 422c1.

  According to the fuel pump 400 and the method of manufacturing the fuel pump 400 according to the fourth embodiment of the present invention, the contact area between the inner peripheral surface 422a1IN of the laminated yoke portion 422a1 and the outer peripheral surface of the coil mold 422c is increased by the contact portion 422c1. Thus, the fixing force between the laminated yoke portion 422a1 and the coil mold 422c can be improved as compared with the fuel pumps 100 and 200 according to the first and second embodiments. Thereby, there is an effect that vibration during operation of the fuel pump 400 can be further suppressed. An advantageous fuel pump may be selected according to the specifications of the fuel pump to be manufactured. In the present specification, the stator iron core and the rotor iron core have been described using the laminated iron core, but each may be an iron core formed from one material.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

100, 200, 300, 400 Fuel pump, 2 motor,
20, 220, 320 stator, 320b split stator, 20IN inner peripheral surface,
21, 221 rotor, 21OUT outer peripheral surface, 21a rotating shaft, 21b rotor core,
21c permanent magnet, 22, 222 laminated iron core, 22a divided laminated iron core,
22a1, 322a1, divided laminated yoke part, 222a1, 422a1, laminated yoke part,
22a2, 222a2, 322a2 laminated teeth, 22b coil,
22c, 322c, 422c coil mold, 3 pump part, 31 pump base,
32 pump cover, 33 impeller, 34 suction port, 35 pump section flow path,
36 Pump outlet, 4 Housing, 5 Hoop material, 61 Bearing, 62 Bearing,
7 End cover, 71 Discharge port, 72 Power supply terminal, 73 Check valve, 73a valve,
73b Spring, 8 insulator, 9a, 309a 1st mold,
9b, 309b Second mold, F edge, K, K3 fitting part, M, M2, M3 fitting groove,
G1, G2, G4 gap, H1, H2 yoke hole, H3 slot hole,
S1-S4 gap, r1 inner diameter, r2 outer diameter.

Claims (11)

A housing, and an end cover disposed so as to close one of the openings in the axial direction of the housing;
A pump unit disposed in the housing so as to close the other opening of the housing, and sucking a liquid from outside to pump the liquid into the housing;
A motor disposed in the housing and driving the pump unit;
A discharge port for discharging the liquid pressurized above a predetermined pressure to the outside of the housing;
The motor includes a stator and a rotor disposed on an inner peripheral side of the stator,
The stator includes an annular yoke portion, an iron core including a plurality of tooth portions projecting inward from the yoke portion, coils wound around the tooth portions via insulating members, and the coil A coil mold that insulates from the liquid,
A first flow path formed in an axial direction of the stator between the outer peripheral surface of the rotor and the inner peripheral surface of the stator, and allowing the liquid to flow from the liquid suction side to the discharge side;
Another flow path that is located radially outward from the inner peripheral surface of the stator and radially inner from the outer peripheral surface of the yoke portion, and flows the liquid from the suction side to the discharge side of the liquid. ,
Between the outer peripheral surface of the coil mold and the inner peripheral surface of the yoke part, the liquid passes in the axial direction from the suction side to the discharge side; ,
Between the two coil molds formed in adjacent tooth portions, a slot hole that penetrates in the axial direction and forms a fourth flow path as the other flow path,
The fourth flow path is a pump communicating with the first flow path and the second flow path. The core, the yoke portion of the radially outward from the outer peripheral surface of the coil mold, penetrating in the axial direction, according to claim 1, further comprising a yoke bore that constitutes the third flow path as the other flow path Pump. The pump according to claim 1 or 2 , wherein the iron core is divided into the yoke portion and a plurality of the tooth portions. The yoke portion has an axially extending fitting groove that fits a fitting portion formed on the outer circumference side of the teeth portion on an inner circumference, and the yoke portion hole is formed with the fitting groove. The pump according to claim 2 , wherein the pump is provided on an extension line of a line segment that bisects the tooth portion in the circumferential direction, and a joint portion of the fitting portion. A housing, and an end cover disposed so as to close one of the openings in the axial direction of the housing;
A pump unit disposed in the housing so as to close the other opening of the housing, and sucking a liquid from outside to pump the liquid into the housing;
A motor disposed in the housing and driving the pump unit;
A discharge port for discharging the liquid pressurized above a predetermined pressure to the outside of the housing;
The motor includes a stator and a rotor disposed on an inner peripheral side of the stator,
The stator includes an annular yoke portion, an iron core including a plurality of tooth portions projecting inward from the yoke portion, coils wound around the tooth portions via insulating members, and the coil A coil mold that insulates from the liquid,
A first flow path formed in an axial direction of the stator between the outer peripheral surface of the rotor and the inner peripheral surface of the stator, and allowing the liquid to flow from the liquid suction side to the discharge side;
Another flow path that is located radially outward from the inner peripheral surface of the stator and radially inner from the outer peripheral surface of the yoke portion, and flows the liquid from the suction side to the discharge side of the liquid. ,
The iron core includes a yoke portion hole that penetrates in the axial direction in the yoke portion radially outside the outer peripheral surface of the coil mold, and constitutes a third flow path as the other flow path,
The yoke portion has an axially extending fitting groove that fits a fitting portion formed on the outer circumference side of the teeth portion on an inner circumference, and the yoke portion hole is formed with the fitting groove. The pump provided on the joint line of the said fitting part and the extension of the line segment which bisects the said teeth part in the circumferential direction. Between the outer peripheral surface of the coil mold and the inner peripheral surface of the yoke portion, a second flow path as the other flow path, in which the liquid passes in the axial direction from the suction side to the discharge side. The pump according to claim 5 provided. The pump according to claim 6, further comprising a slot hole that penetrates in an axial direction and forms a fourth flow path as the other flow path between the two coil molds formed in adjacent tooth portions. The pump according to claim 7, wherein the fourth flow path communicates with the first flow path and the second flow path. The pump according to any one of claims 1 to 8, wherein a contact portion that contacts an inner peripheral surface of the yoke portion is provided on an outer peripheral surface of the coil mold. The pump according to any one of claims 1 to 9, wherein the iron core is a laminated iron core in which iron core pieces are laminated in an axial direction. It is a manufacturing method of a pump given in any 1 paragraph of Claims 1-10,
Teeth manufacturing process for manufacturing a tooth part, a coil winding process for concentrating the coil around the tooth part via the insulating member, and molding the coil and the insulating member after the coil winding process A method for manufacturing a pump including a coil molding process.

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