JP6584473B2 - Fuel pump and method of winding stator core winding of fuel pump - Google Patents

Description

  The present invention relates to a fuel pump including a motor that sucks fuel from a fuel tank and supplies the fuel 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, ends on the cover end side of a plurality of windings are connected by a single terminal sub-assembly. That is, by connecting the terminal portion on the cover end side to form a terminal sub-assembly, the winding end of the motor can be easily routed and connected.
In the motor of Patent Document 2, the terminal insertion portion is installed on the inner peripheral side of the stator core, and the fusing holes of the winding and the terminal are provided in the upper end portion of the terminal, thereby improving the workability of joining the terminal and the winding. After fusing the winding and terminal into the fusing hole, the length of the terminal in the motor axis direction is shortened by bending the upper part of the terminal with the fusing hole to the inner periphery of the core. .

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 length of the terminal portion in the motor axial direction is increased, thereby increasing the total length of the motor.
In Patent Document 2, since the coil connection terminal portion is installed on the inner peripheral side with respect to the coil of the stator core, when the connecting plate portion is bent outward in the core inner peripheral direction, the bent terminal becomes the motor radial direction. And the entire motor becomes larger in the radial direction.
The present invention has been made to solve the above-described problems, and aims to reduce the length in the motor axial direction and the length in the motor radial direction of the power supply terminal and the neutral point terminal. .

The fuel pump according to the present invention is:
A motor composed of a rotor part and a stator core part, and the rotation of the rotor part, sucks fuel from the fuel suction port, passes through between the stator core part and the rotor part, and then discharges it from the discharge port of the end cover part. 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 between the inner periphery and the outer periphery of the stator core and extends radially inward of the stator core, and has a winding curl at a portion extending radially inward of the stator core. It is arranged above the winding wound around the bobbin .

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

It is sectional drawing of the fuel pump concerning Embodiment 1 of this invention. It is a top view of the 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 and neutral point terminal of the stator core part of the fuel pump concerning Embodiment 1 of the present invention are bent. It is sectional drawing of the fuel pump for a reference for comparing with Embodiment 1 of this invention. It is a top view of the fuel pump for reference 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 a winding process explanatory drawing to the bobbin of the fuel pump for a reference for comparing with Embodiment 2 of the present invention, and a sectional view of a stator core part. It is winding process explanatory drawing 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 the bending of the power supply terminal and neutral point terminal of the stator core part of the fuel pump concerning Embodiment 3 of this invention. It is a front view of the neutral point terminal of the fuel pump concerning Embodiment 3 of this invention.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view of a fuel pump according to Embodiment 1 of the present invention. 2 is a top view of FIG. 1, and FIG. 3 is a cross-sectional view along AA of FIG. The fuel pump 10 is an in-tank type fuel pump installed in a fuel tank of an automobile or the like. In FIG. 1, it is comprised from the pump part 20 which sends out fuel, and the motor part 30 which drives the pump part 20. In FIG.

  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. After the impeller 23 is inserted into the inner peripheral portion, the pump case 21 and the outer periphery are placed so as to accommodate the impeller 23. The pump case 22 is covered so as to match, and one end of the metal housing 71 is caulked to fix the pump case 22. With such a configuration, the pump case 21, 22 fixed with the outer periphery is formed with a space portion 25 for accommodating the impeller 23, and a fuel inlet 24 communicating with the space portion 25 is formed in the pump case 22. The fuel discharge port 26 is formed in the pump case 21.

  The motor unit 30 includes a stator core unit 40 and a rotor unit 70. In the rotor part 70, the permanent magnet 51 and the shaft 52 are fixed by the resin member 53, and the rotor part 70 is installed on the inner peripheral side of the stator core part 40. The impeller 23 is connected by a notch portion 54 of the shaft 52 and is configured to follow the rotation of the rotor portion 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 while being caulked in the motor axial direction (longitudinal direction of the shaft 52). As shown in FIG. 3, six teeth are arranged in the inner peripheral direction of the motor portion 30. 45 are formed at equal intervals in the circumferential direction. A bobbin 41 is attached to each tooth 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 energization is controlled according to the position of the rotor portion 70. Each of the power supply terminal 81 and the neutral point terminal 82 is provided with winding curled portions 84, 85. As shown in FIG. 1, these winding curled portions 84, 85 are arranged on the radially inner side of the stator core 44. It is arranged facing. Thereby, 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 curling processing in which the discharge port side end portion 72 in the motor axial direction of the metal housing 71 is bent toward the inner peripheral side of the stator core portion 40.

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

Next, a process in which the power supply terminal 81 and the neutral point terminal 82 are bent in the inner diameter direction of the stator core 44 and the stator core portion 40 is deformed 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 the deformation.
First, after the winding of the stator core 40 is completed, the winding and the winding portion 84 of the power supply terminal 81 are electrically connected by fusing or the like. Similarly, the winding and the winding-up part 85 of the neutral point terminal 82 are electrically connected by fusing or the like.
Next, as shown in FIG. 4A, the upper portion of the power supply terminal 81 from the winding curled 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 portion of the power supply terminal 81 than the winding curled portion 84 is bent in the Q direction which is the radially inner side of the stator core 44.
Further, as shown in FIG. 4B, the neutral point terminal 82 bends the lower part from the winding curled portion 85 in the S direction which is the radially inner side of the stator core 44.

  For comparison with FIG. 1, FIG. 6 shows a cross-sectional view of the fuel pump when the end cover portion 60 is molded without deforming the power supply terminal 81 and the neutral point terminal 82. FIG. 7 shows a top view of the fuel pump of FIG. The fuel pump according to the first embodiment of the present invention shown in FIG. 1 has the following effects compared with the fuel pump of FIG.

(Effect 1)
The fuel pump 10 of FIG. 1 has a power supply terminal 81, a neutral point terminal 82 arranged radially inward of the stator core 44, so that a winding curl 84 attached to the power supply terminal 81, and The length in the motor axial direction of the winding portion 85 attached to the neutral point terminal is shortened. Thereby, since the end cover part 60 which covers the stator core part 40 can also shorten the rotating shaft direction length of the motor part 30, the full length of the motor part 30 can be shortened.

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

(Effect 3)
Furthermore, in contrast to FIG. 7, in FIG. 2, 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 is located near the discharge port 62. When connecting the outlet 62 and the power supply terminal 81 to a fuel supply device unit (not shown), the connection portion with the fuel supply device unit can be reduced, and the connection portion with the fuel supply device unit (not shown) is connected to the fuel supply device. Since the degree of freedom of the places that can be arranged in the unit is increased, the layout is improved.

(Effect 4)
As shown in FIG. 5, the power supply terminal 81 and the neutral point terminal 82 are located inside the outer peripheral surface of the stator core 44 and outside the inner peripheral surface of the stator core 44 in the radial direction 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.

Embodiment 2. FIG.
The fuel pump according to the second embodiment of the present invention is different from the fuel pump according to the first embodiment in the shape of the neutral point terminal 82. FIG. 8 is a sectional view of a fuel pump according to the second embodiment of the present invention. In this fuel pump, it is assumed that the winding is wound by the flyer winding method in order to wind the winding with high density on the bobbin attached to the stator core. The winding work process will be described below.
9A shows the stator core 44, FIG. 9B shows the stator core 44 with the bobbin 41, the power supply terminal 81, and the neutral point terminal 82. FIG. 10A shows the stator core 44 with flyer winding. The figure which has wound the winding in the wire machine 101 is shown.

  In the stator core 44 of FIG. 9A, the pole pieces 50 having the teeth 45 wound with the windings and the yoke pieces 46 without the teeth 45 are alternately arranged, and can be bent by the connecting portions 47. It is connected. The both ends of the stator core 44 have no connection part, 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. FIG. 9B shows a state where the power supply terminal 81 and the neutral point terminal 82 are mounted on bobbins (for example, 41a and 41b) which are insulating resin members, and then the bobbin is mounted on the stator core 44.

  FIG. 10 is an explanatory diagram of a winding process to a bobbin of a reference fuel pump and a sectional view of a stator core part for comparison with Embodiment 2 of the present invention. FIG. 10A is an explanatory diagram of a winding operation in a flyer winding machine. The stator core 44 is in a state in which each connecting portion 47 is bent to the outer peripheral side of the stator core 44 so that the flyer portion 102 of the flyer winding machine 101 does not hit an adjacent magnetic pole piece from the shape of FIG. The winding is wound around the power supply terminal 81 attached to the magnetic pole piece 50a at the end of the stator core 44, and the winding of the power supply terminal 81 is prevented so that the winding does not come off from the winding flange 84. The part 84 is caulked and the winding is wound around the bobbin 41a.

  FIG. 10B shows a BB sectional view of FIG. 10A, and FIG. 10C shows a CC sectional view of FIG. The winding curled portion 84 of the power supply terminal 81 is tilted in the outer peripheral direction of the stator core 44 so as not to enter the upper region 103 in the motor axial direction of the bobbin through which the winding passes when the winding is wound around the bobbin 41a. ing. As a result, the flyer 102 can perform the winding work without interference between the winding and the bald portion 84 of the power supply terminal. After winding the winding around the bobbin 41a of the pole piece 50a, the winding is wound around the back surface of the stator core 44, wound around the bobbin of the pole piece 50b, and wound around the bobbin of the pole piece 50b. The winding is applied from the winding of the neutral point terminal to the bald portion 85, and the winding bald portion 85 is tilted toward the outer periphery of the stator core. Therefore, when winding the winding around the bobbin of the magnetic pole piece 50b, the winding hook 85 of the neutral point terminal passes through the winding when winding the winding around the bobbin as shown in FIG. The bobbin enters the upper region 103 in the motor axial direction, and the winding operation by the flyer unit 102 becomes impossible. For this reason, as shown in FIGS. 11A and 11B, the neutral point terminal 86 is attached to secure the motor axial direction upper region 103 and the flyer winding machine 101 performs winding.

  That is, as shown in FIG. 11 (b), the neutral point terminal 86 enters the upper portion 103 of the bobbin 41b in the motor axial direction of the bobbin 41b through which the winding passes when the winding is wound around the bobbin. In order to avoid this, a crank shape (including an S-shape) is formed by bending the terminal in the direction of the back surface of the stator core. Thereby, the winding work in the flyer part 102 becomes possible. FIG. 12 is a view for explaining the bending process of the neutral point terminal 86. FIG. As shown in FIG. 11 (b), the winding at the flyer portion 102 is made possible by bending the terminal toward the back surface of the stator core, but the winding portion 87 of the terminal is outside the outer periphery of the stator core. Since it protrudes, the outer diameter of an end cover will become large and the outer diameter of a motor will become large. Therefore, after the winding operation, the neutral point terminal 86 is bent in the T direction on the inner peripheral side of the stator core as shown in FIG. 12, thereby avoiding the protruding portion 87 of the terminal winding bulge outward from the outer periphery of the stator core. can do.

(effect)
From the above, the winding passes when winding the winding portion 87 of the neutral point terminal 86 around the bobbin in order to wind the winding at a high density using the flyer in the winding operation to the bobbin. To avoid the enlargement in the radial direction, the winding bald part is released to the outer periphery side of the stator core so as to be separated from the upper axial region 103 of the bobbin, and then the neutral point terminal 86 is bent to the inner periphery side of the stator core 44. can do.

Embodiment 3 FIG.
In the fuel pump according to the third embodiment of the present invention, the shape of the neutral point terminal 82 is different from that described in the first embodiment. 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. FIG. 15A shows a top view of the stator core portion before the neutral point terminal 88 is bent, and FIG. The stator core part top view after the neutral point terminal 88 is bent is shown. FIG. 16A is a front view of the neutral point terminal 88c mounted on the magnetic pole piece 50c of the stator core as viewed from the E direction on the inner periphery of the stator core in FIG. FIG. 16B shows a front view of the neutral point terminal 88d mounted on the magnetic pole piece 50d of the stator core as seen from the F direction on the inner periphery of the stator core. FIG. 16b shows a front view of the neutral point terminal 88e attached to the magnetic pole piece 50e of the stator core as seen from the G direction on the inner periphery of the stator core.

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

(effect)
Thereby, the part which connects neutral points becomes unnecessary. In addition, the problem that the neutral point terminal becomes longer in the axial direction and the end cover length becomes longer due to the addition of the part that connects the neutral points is solved by bending the inner end of the stator core. Can do.

  It should be noted that within the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted. In the drawings, the same reference numerals denote the same or corresponding parts having the configuration and function.

20: Pump part, 30: Motor part, 40: Stator core part, 41, 41a, 41b: Bobbin, 44: Stator core, 42: Coil, 45: Teeth, 70: Rotor part, 52: Shaft, 60: End cover part , 81: Power supply terminal, 82, 86, 88, 88c, 88d, 88e: Neutral point terminal, 84, 85, 87: Winding bald part, 91, 92, 93, 94: Neutral point connecting part

Claims (7)

  A motor composed of a rotor portion and a stator core portion, and the rotation of the rotor portion sucks fuel from a fuel suction port, passes through between the stator core portion and the rotor portion, and then discharges from a discharge port of the end cover portion. In the fuel pump, the stator core portion is an annular stator core, a bobbin attached to the stator core, a winding wound around the bobbin, and attached to the bobbin and electrically connected to the winding. The neutral point terminal is formed between the inner periphery and the outer periphery of the stator core, extending radially inward of the stator core between the inner periphery and the outer periphery of the stator core. The fuel pump is characterized in that the coiled part is disposed above the coil wound around the bobbin.   The fuel pump according to claim 1, wherein the neutral point terminal is bent radially inward of the stator core.   The neutral point terminal has a neutral point connection portion extending in a circumferential direction of the stator core, and is in contact with a neutral point connection portion of an adjacent neutral point terminal. The fuel pump described.   A power supply terminal mounted on the bobbin and electrically connected to the winding is molded to the end cover portion together with the neutral point terminal, and between the inner periphery and the outer periphery of the stator core, Extending radially inward from the stator core, and having a winding curled portion at a portion extending inward in the radial direction of the stator core, and the winding curled portion is disposed above the winding wound around the bobbin. The fuel pump according to any one of claims 1 to 3, wherein the fuel pump is provided.   The power supply terminal is bent inward of the stator core in the radial direction from the stator core portion, and further bent in the direction of the end cover portion so that a tip portion protrudes from the end cover portion. The fuel pump according to claim 4.   The tip of the power supply terminal protruding from the end cover part and the metal housing provided around the end cover part are separated from each other by the distance at which the power supply terminal is bent radially inward of the stator core. The fuel pump according to claim 5, wherein: A bobbin mounted on a stator core and no joint iron of magnetic pole pieces and the teeth that have a tooth is composed are connected alternately, when winding the winding by a flyer winding machine, the flyer winding Each connecting portion connecting the magnetic pole piece and the yoke piece is bent to the outer peripheral side of the stator core so that the flyer portion of the machine does not hit the adjacent magnetic pole piece, and the winding is attached to the bobbin. In a winding method of a stator core winding of a fuel pump, wherein the neutral point terminal winds the winding to the bobbin from the winding of the neutral point terminal attached to the bobbin. The coil is bent in a direction protruding from the outer periphery of the stator core so that the burr portion does not enter above the bobbin through which the winding passes when winding, and the winding of the winding The neutral point terminal is bent toward the inner peripheral side of the stator core, and the neutral point terminal is disposed between the outer periphery and the inner periphery of the stator core, so that the coil is wound around the bobbin. A winding method for winding a stator core of a fuel pump, wherein the coiling portion is disposed.

Images