JP2019080445A - Fuel pump and method of winding stator core winding wire of the same - Google Patents

Abstract

To reduce a motor shaft length and a motor radial length of a power supply terminal and a neutral point terminal.SOLUTION: A coil 42 wound around each tooth is electrically connected to a power supply terminal 81 and a neutral point terminal 82, and energization is controlled in accordance with a position of a rotor unit 70. Winding wire winding sections 84, 85 are provided on each of the power supply terminal 81 and the neutral point terminal 82. The winding wire winding sections 84, 85 are disposed radially inward of a stator core. Thus, the power supply terminal 81 and the neutral point terminal 82 are also bent inward in the radial direction of the stator core.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel pump provided with a motor that sucks up fuel from a fuel tank and supplies it to equipment such as an engine.

Patent Document 1 shows an example in which a brushless motor is used as a drive source of a fuel pump.
In the brushless motor of Patent Document 1, the ends on the cover end side of the plurality of windings are connected by one terminal subassembly. That is, by arranging the terminal portion on the cover end side to form a terminal subassembly, the winding end of the motor can be easily arranged and connected.
In the motor of Patent Document 2, the terminal insertion portion is disposed on the inner peripheral side of the stator core, and the winding and the hole for fusing of the terminal are provided at the upper end portion of the terminal to improve the joining workability of the terminal and the winding. After fusing the winding and terminal into the fusing hole, the upper part of the terminal provided with the fusing hole is bent toward the inner periphery of the core to shorten the axial length of the terminal in the motor direction. .

JP 2012-228178 A JP-A-11-150904

In Patent Document 1, since the terminal sub-assembly is provided on the cover end side in the axial direction, the axial length of the terminal in the motor axial direction becomes long, whereby the overall motor length becomes long.
In Patent Document 2, since the coil connection terminal portion is disposed on the inner peripheral side of the coil of the stator core, when the connection plate portion is bent outward in the inner peripheral direction of the core, the bent terminal is in the motor radial direction And the entire motor increases in the radial direction.
The present invention has been made to solve the above-described problems, and it is an object of the present invention to reduce the motor axial length and the motor radial length of a power supply terminal and a neutral point terminal. .

The fuel pump according to the present invention is
The motor consisting of the rotor and the stator core, and the rotation of the rotor, sucks in fuel from the fuel suction port, passes between the stator core and the rotor, and then discharges it from the discharge port of the end cover. The stator core portion comprises a stator core, a bobbin mounted on the stator core, a winding wound on the bobbin, and a neutral point terminal electrically connected to the winding, and the neutral point terminal is from the stator core portion The rotor portion extends in the direction of the rotation axis, and its tip end portion is bent toward the stator core inner diameter side between the inner periphery and the outer periphery of the stator core, and is disposed above the winding.

  According to the fuel pump of the present invention, the motor can be reduced in the axial direction and in the radial direction, and miniaturization can be achieved.

FIG. 1 is a cross-sectional view of a fuel pump according to Embodiment 1 of the present invention. It is a top view of a fuel pump concerning Embodiment 1 of the present invention. It is AA sectional drawing of FIG. It is sectional drawing of the stator core part of the fuel pump concerning Embodiment 1 of this invention, and is a bending process figure of a power supply terminal and a neutral point terminal. It is a top view after the power supply terminal of a stator core part of a fuel pump concerning Embodiment 1 of the present invention, and a neutral point terminal after being bent. It is sectional drawing of the fuel pump for reference for comparing with Embodiment 1 of this invention. It is a top view of the reference fuel pump for comparing with Embodiment 1 of the present invention. It is sectional drawing of the fuel pump concerning Embodiment 2 of this invention. It is a top view which shows the structure of the stator core part of the fuel pump concerning Embodiment 2 of this invention. It is sectional drawing of the winding process to the bobbin of the fuel pump for reference for comparing with Embodiment 2 of this invention, and sectional drawing of a stator core part. It is sectional drawing of the winding process to the bobbin of the fuel pump concerning Embodiment 2 of this invention, and sectional drawing of a stator core part. It is sectional drawing of the stator core part of the fuel pump concerning Embodiment 2 of this invention, and is a bending process figure of a neutral point terminal. It is sectional drawing of the fuel pump concerning Embodiment 3 of this invention. It is sectional drawing of the stator core part of the fuel pump concerning Embodiment 3 of this invention, and is a bending process figure of a power supply terminal and a neutral point terminal. It is a top view before and behind bending of a power supply terminal and a neutral point terminal of a stator core part of a fuel pump concerning Embodiment 3 of the present invention. It is a front view of the neutral point terminal of the fuel pump concerning Embodiment 3 of this invention.

Embodiment 1
FIG. 1 is a cross-sectional view of a fuel pump according to a first embodiment of the present invention. 2 shows a top view of FIG. 1, and FIG. 3 shows a cross-sectional view taken along line AA of FIG. The fuel pump 10 is an in-tank fuel pump installed in a fuel tank of a car or the like. In FIG. 1, the pump unit 20 includes a pump unit 20 for feeding fuel and a motor unit 30 for driving the pump unit 20.

  As shown in FIG. 1, the pump unit 20 includes pump cases 21 and 22 and an impeller 23. That is, the pump case 21 is press-fitted and fixed to the inner peripheral side of the cylindrical metal housing 71, and after the impeller 23 is inserted into the inner peripheral portion, the pump case 21 and the outer periphery are housed to accommodate the impeller 23 The pump case 22 is covered so as to match, and one end of the metal housing 71 is crimped to fix the pump case 22. With such a configuration, a space 25 for housing the impeller 23 is formed in the pump cases 21 and 22 fixed together at the outer periphery, and the fuel suction port 24 communicating with the space 25 is formed in the pump case 22 The fuel discharge port 26 is formed in the pump case 21.

  The motor unit 30 comprises a stator core unit 40 and a rotor unit 70. The permanent magnet 51 and the shaft 52 are fixed by the resin member 53, and the rotor portion 70 is installed on the inner peripheral side of the stator core portion 40. The impeller 23 is connected by the notch 54 of the shaft 52, and is configured to follow the rotation of the rotor unit 70 with the shaft 52 as a rotation axis.

  The stator core 44 of the stator core portion 40 is formed by laminating electromagnetic steel plates in the axial direction of the motor (longitudinal direction of the shaft 52), and as shown in FIG. 3, six teeth are formed in the inner circumferential direction of the motor portion 30. 45 are formed at equal intervals in the circumferential direction. A bobbin 41 is attached to each of the teeth 45, and a coil (winding) 42 is wound on the bobbin 41.

  The coils 42 wound around the teeth 45 are electrically connected to the power supply terminal 81 and the neutral point terminal 82, and the energization is controlled according to the position of the rotor unit 70. Winding winding portions 84 and 85 are provided on the power supply terminal 81 and the neutral point terminal 82 respectively, and as shown in FIG. 1, these winding portions 84 and 85 are provided radially inward of the stator core 44. It is arranged facing. Thus, the power supply terminal 81 and the neutral point terminal 82 are also bent inward in the radial direction of the stator core 44.

  The end cover portion 60 is manufactured by integrally molding the stator core portion 40, the bearing 61 of the shaft 52 of the rotor portion 70, and the metal housing 71 with an insulating resin member. Thereafter, the end cover portion 60 is fixed in the motor axial direction by performing a curling process of bending the discharge port side end portion 72 in the motor axial direction of the metal housing 71 to the inner peripheral side of the stator core portion 40.

  The fuel pump 10 configured as described above rotates the rotor unit 70 by supplying a controlled current to the power supply terminal 81, and the impeller 23 connected to the shaft 52 rotates following the rotation. The fuel is drawn in from the fuel suction port 24 of the pump case 22 and is sent out from the fuel discharge port 26 of the pump case 22 to the inside of the metal housing 71 via the space 25 and the inner periphery of the stator core 40 and the rotor 70 After passing through the gap, the fuel is discharged from the discharge port 62 of the end cover portion 60.

Next, a process of bending the power supply terminal 81 and the neutral point terminal 82 in the inner diameter direction of the stator core 44 and deforming the stator core portion 40 into the shape of FIG. 1 will be described. FIG. 4 shows a deformation process diagram of the stator core portion 40 according to the first embodiment of the present invention, and FIG. 5 shows a top view of the stator core portion 40 after deformation.
First, after the winding is completed, the stator core portion 40 electrically connects the winding and the winding-to-turn portion 84 of the power supply terminal 81 by fusing or the like. Similarly, the winding and the winding and winding portion 85 of the neutral point terminal 82 are electrically connected by fusing or the like.
Next, as shown in FIG. 4A, of the power supply terminal 81, the upper portion of the winding wire portion 84 is bent in the P direction, which is the radially outer side of the stator core 44. Thereafter, as shown in FIG. 4B, the lower part of the power supply terminal 81 than the winding and burring part 84 is bent in the Q direction which is the inner side in the radial direction of the stator core 44.
Further, as shown in FIG. 4B, the neutral point terminal 82 bends the lower part of the winding and winding portion 85 in the S direction, which is the inner side in the radial direction of the stator core 44.

  For comparison with FIG. 1, FIG. 6 shows a cross-sectional view of a fuel pump when the end cover portion 60 is molded without deforming the power supply terminal 81 and the neutral point terminal 82. A top view of the fuel pump of FIG. 6 is shown in FIG. The fuel pump according to the first embodiment of the present invention shown in FIG. 1 has the following effects as compared with the fuel pump shown in FIG.

(Effect 1)
The fuel pump 10 shown in FIG. 1 has a power supply terminal 81 and a winding point portion 84 attached to the power supply terminal 81 by the neutral point terminal 82 being disposed radially inward of the stator core 44; The motor axial direction length of the winding wire 85 attached to the neutral point terminal is shortened. As a result, the end cover portion 60 covering the stator core portion 40 can also shorten the length of the motor portion 30 in the rotational axis direction, so the overall length of the motor portion 30 can be shortened.

(Effect 2)
While the distance between the power supply terminal 81 and the discharge port side end 72 of the metal housing 71 is short in FIG. 6 or 7 and the insulation distance H can not be sufficiently secured, the fuel pump 10 of FIG. Since the supply terminal 81 is bent inward in the radial direction of the stator core 44, a sufficient insulation distance H can be secured. Similarly, the insulation distance between the neutral point terminal 82 and the metal housing 71 can be sufficiently secured.

(Effect 3)
Further, as compared with FIG. 7, in FIG. 2, since the portion 83 protruding from the end cover portion 60 of the power supply terminal 81 is disposed on the radially inner peripheral side of the motor portion 30 and located near the discharge port 62 When connecting the outlet 62 and the power supply terminal 81 to a fuel supply unit not shown, the connection with the fuel supply unit can be made smaller, and the connection with the fuel supply unit not shown can be a fuel supply Since the degree of freedom of the place which can be arranged in the unit becomes high, the layout property is improved.

(Effect 4)
As shown in FIG. 5, the power supply terminal 81 and the neutral point terminal 82 are accommodated inside the outer peripheral surface of the stator core 44 in the radial direction of the stator core 44 and outside the inner peripheral surface of the stator core 44, The terminal does not increase the outer periphery of the end cover portion 60, and the inner periphery of the end cover portion 60 does not decrease.

Second Embodiment
The fuel pump according to the second embodiment of the present invention differs from the fuel pump of the first embodiment in the shape of the neutral point terminal 82. FIG. 8 is a cross-sectional view of a fuel pump according to a second embodiment of the present invention. In this fuel pump, it is assumed that the winding is wound by a flyer winding method in order to wind the winding at high density on the bobbin mounted on the stator core. The steps of the winding operation are described below.
9A shows the stator core 44, FIG. 9B shows the stator core 44, the bobbin 41, the power supply terminal 81 and the neutral point terminal 82 attached, and FIG. The figure which winds a winding with wire machine 101 is shown.

  In the stator core 44 of FIG. 9A, the pole pieces 50 possessing the teeth 45 for winding the winding and the yoke pieces 46 without the teeth 45 are alternately arranged, and can be bent by their connecting portions 47 It is connected. Both ends of the stator core 44 have no connection portion, and one is provided with a convex shape 48 and the other is provided with a concave shape 49, and they are attached to each other. A state in which the power supply terminal 81 and the neutral point terminal 82 are attached to bobbins (for example, 41a and 41b) which are insulating resin members and then the bobbin is attached to the stator core 44 is shown in FIG.

  FIG. 10 is an explanatory view of a process of winding a bobbin of a reference fuel pump for comparison with Embodiment 2 of the present invention and a cross-sectional view of a stator core portion. FIG. 10A is an explanatory view of the winding operation in the flyer winding machine. In a state where each connecting portion 47 is bent to the outer peripheral side of the stator core 44 so that the stator core 44 has an angle that the flyer portion 102 of the flyer winding machine 101 does not hit adjacent pole pieces from the shape of FIG. And winding the winding to the power supply terminal 81 attached to the pole piece 50a at the end of the stator core 44 so that the winding does not deviate from the winding section 84, the winding of the power supply terminal 81 is Part 84 is crimped to show a state in the middle of winding the winding around the bobbin 41a.

  10 (b) shows a cross-sectional view taken along the line BB in FIG. 10 (a), and FIG. 10 (c) shows a cross-sectional view taken along the line CC in FIG. 10 (a). The winding wire portion 84 of the power supply terminal 81 is turned in the outer peripheral direction of the stator core 44 so as not to enter the motor axial direction upper region 103 of the bobbin through which the winding passes when winding the winding around the bobbin 41a. ing. As a result, the winding work can be performed at the flyer unit 102 without interference between the winding and the winding and winding portion 84 of the power supply terminal. After winding the winding around the bobbin 41a of the pole piece 50a, after crossing the back of the stator core 44, winding the winding around the bobbin of the pole piece 50b and winding the winding around the bobbin of the pole piece 50b, A winding is applied to the winding barb portion 85 of the neutral point terminal, and the winding barb portion 85 is turned to the outer periphery side of the stator core. Therefore, when winding the winding around the bobbin of the pole piece 50b, the winding passes through the winding from the winding of the neutral point terminal as shown in FIG. 10C when winding the winding around the bobbin In this state, the motor shaft direction upper region 103 of the bobbin is intruded into the motor axial direction upper region 103, and the winding operation by the flyer unit 102 becomes impossible. Therefore, by mounting the neutral point terminal 86 as shown in FIGS. 11 (a) and 11 (b), the motor axial direction upper region 103 is secured, and winding is performed by the flyer winding machine 101.

  That is, as shown in FIG. 11B, in the neutral point terminal 86, when the winding is wound around the bobbin, the winding portion 87 penetrates the motor axial direction upper region 103 of the bobbin 41b through which the winding passes. In order not to do so, it has a crank shape (including an S-shape) in which the terminal is bent in the back direction of the stator core. Thereby, the winding work in the flyer section 102 becomes possible. FIG. 12 shows a diagram for explaining the bending process of the neutral point terminal 86. As shown in FIG. As shown in FIG. 11B, by bending the terminal in the direction of the back surface of the stator core, winding at the flyer section 102 becomes possible, but the winding from the terminal of the terminal is outside the outer periphery of the stator core Since the end cover is pushed out, the outer diameter of the end cover is increased, and the outer diameter of the motor is increased. Therefore, after winding operation, the neutral point terminal 86 is bent in the direction T on the inner peripheral side of the stator core as shown in FIG. 12 to prevent the winding 87 of the terminal from protruding outside the outer periphery of the stator core. can do.

(effect)
From the above, the winding passes through the winding from the winding of the neutral point terminal 86 to the winding of the neutral point terminal 86 in order to wind the winding at high density using the flyer in the winding operation to the bobbin. The winding portion is released to the outer periphery of the stator core so as to deviate from the motor axial direction upper region 103 of the bobbin, and then the neutral point terminal 86 is bent to the inner periphery of the stator core 44 to avoid radial expansion. can do.

Third Embodiment
The fuel pump according to the third embodiment of the present invention differs from that of the first embodiment in the shape of the neutral point terminal 82. FIG. 13 shows a fuel pump according to the third embodiment. FIG. 14 shows a bending process diagram of the neutral point terminal 88 of the fuel pump according to the third embodiment, and FIG. 15 (a) shows a top view of the stator core portion before bending the neutral point terminal 88, and FIG. The top view of the stator core part after bending of neutral point terminal 88 is shown. FIG. 16 (a) is a front view of the neutral point terminal 88c attached to the pole piece 50c of the stator core as viewed from the direction E of the inner periphery of the stator core of FIG. 15 (a). The front view which looked at the neutral point terminal 88d with which the pole piece 50d of the stator core is mounted | worn with FIG.16 (b) from the F direction of stator core inner periphery is shown. The front view which looked at the neutral point terminal 88e with which the pole piece 50e of a stator core is mounted | worn with FIG. 16b from the G direction of stator core inner periphery is shown.

  Thus, neutral point terminals 88c, 88d, 88e having different shapes are attached to the pole pieces 50c, 50d, 50e. The neutral point terminal 88c extends in a direction perpendicular to the teeth 45 of the pole piece 50c in the z-axis direction of FIGS. 13 and 16, and has a neutral point connecting portion 91 extending toward the pole piece 50d at its tip. doing. The neutral point terminal 88d extends in the same direction as the neutral point terminal 88c, and has at its tip a neutral point connecting portion 92 extending toward the pole piece 50c and a neutral point connecting portion 93 extending toward the pole piece 50e. have. The neutral point terminal 88e extends in the same direction as the neutral point terminals 88c and 88d, and has a neutral point connecting portion 94 extending toward the pole piece 50d at the tip thereof. As shown in FIG. 14, when the neutral point terminal 88 (88c, 88d, 88c) is bent to the inner peripheral side of the stator core 44, as shown in FIG. 15 (b), the neutral point terminals 88c, 88e are bent first. Then, by bending the neutral point terminal 88c, the neutral point connection portion 92 of the neutral point terminal 88d is located at the top of the neutral point connection portion 91 of the neutral point terminal 88c in the z-axis direction. The neutral point connecting portion 93 of the neutral point terminal 88d contacts the upper portion in the z-axis direction of the neutral point connecting portion 94 of the terminal 88e. By welding the respective contact portions by soldering, projection welding or the like, connection of the neutral point becomes possible. The bending of the power supply terminal 81 shown in FIG. 14 is omitted as it is the same as that described in the first embodiment.

(effect)
This eliminates the need for parts connecting neutral points. In addition, the problem that the neutral point terminal becomes long in the axial direction and the end cover length becomes long by adding the part that connects the neutral points is also solved by bending the inner periphery of the stator core. Can.

  In the present invention, within the scope of the invention, each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted. Further, in the drawings, the same reference numerals indicate parts having the same or corresponding configurations and functions.

20: pump unit, 30: motor unit, 40: stator core unit, 41, 41a, 41b: bobbin, 44: stator core, 42: coil, 45: teeth, 70: rotor unit, 52: shaft, 60: end cover unit , 81: power supply terminal 82, 86, 88, 88c, 88d, 88e: neutral point terminal, 84, 85, 87: winding wire, 91, 92, 93, 94: neutral point connection

The fuel pump according to the present invention is
The motor consisting of the rotor and the stator core, and the rotation of the rotor, sucks in fuel from the fuel suction port, passes between the stator core and the rotor, and then discharges it from the discharge port of the end cover. Te, stator core portion, an annular stator core, a bobbin mounted on the stator core, winding is wound around a bobbin is mounted on a bobbin, it consists neutral point terminal is electrically connected to the winding, The neutral point terminal extends radially inward of the stator core between the inner periphery and the outer periphery of the stator core, and has a winding winding portion at a portion extending radially inward of the stator core, and the winding winding portion is , And is disposed above the winding wound on the bobbin .

Claims (10)

  A motor comprising a rotor portion and a stator core portion, fuel is sucked from a fuel suction port by rotation of the rotor portion, and after passing between the stator core portion and the rotor portion, discharged from a discharge port of an end cover portion In the fuel pump, the stator core portion includes a stator core, a bobbin mounted on the stator core, a winding wound on the bobbin, and a neutral point terminal electrically connected to the winding, the neutral A fuel pump characterized in that a point terminal extends radially inward of the stator core from the stator core portion, and is disposed above the winding between an inner periphery and an outer periphery of the stator core.   2. The fuel pump according to claim 1, further comprising: a winding winding portion at a portion of the neutral point terminal which extends radially inward of the stator core.   The fuel pump according to claim 1, wherein the neutral point terminal is bent inward in the radial direction of the stator core.   The neutral point terminal is bent in a crank shape between the winding core and the winding core so as not to be an obstacle when winding the winding around the bobbin. Description fuel pump.   The said neutral point terminal has the neutral point connection part extended in the circumferential direction of the said stator core, It contacts with the neutral point connection part of the adjacent neutral point terminal, The fuel pump according to any one of the preceding claims.   A power supply terminal electrically connected to the winding is molded in the end cover portion together with the neutral point terminal, and extends radially inward from the stator core, between the inner periphery and the outer periphery of the stator core The fuel pump according to any one of claims 1 to 5, wherein the fuel pump is disposed above the winding.   7. The fuel pump according to claim 6, further comprising a winding and winding portion at a radially extending portion of the stator core of the power supply terminal.   The power supply terminal is bent inward in the radial direction of the stator core from the stator core portion, and is bent in the direction of the end cover portion such that a tip end portion protrudes from the end cover portion. The fuel pump according to 6 or 7.   The tip of the power supply terminal protruding from the end cover portion and the metal housing provided around the end cover portion are separated by a distance such that the power supply terminal is bent inward in the radial direction of the stator core The fuel pump according to claim 8, characterized in that:   When winding a winding with a fryer winding machine on a bobbin mounted on a stator core, the above-mentioned neutrality should be prevented so that the winding and winding portion provided at the neutral point terminal does not intrude into the region through which the winding passes. The vicinity of the connecting portion between the point terminal and the winding wire is bent toward the outer periphery of the stator core, and after the winding is wound, the vicinity of the connecting portion between the neutral point terminal and the stator core is bent toward the inner periphery of the stator core. The stator core winding method of a fuel pump, wherein the neutral point terminal is disposed between an outer periphery and an inner periphery of the stator core.

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