Electric pump

Abstract

To provide an electric pump which allows cost reduction, downsizing, and assemblability improvement by reducing the number of components.SOLUTION: An electric pump comprises: a motor having a rotor part and a stator part; a circuit board provided on one side in the axial direction of the motor; a pump mechanism coupled, on the other side in the axial direction of the motor, to the rotor part; a housing; and a seal member 90 which seals a housing space between the motor and the circuit board so as to partition off the housing space. The stator part has a coil wire which extends to one side in the axial direction and is connected to the circuit board. The seal member has: a first surface 91a facing the motor and a second surface 91b facing the circuit board; a first coil guide part 92 which penetrates the seal member in the axial direction; a potting material 99 which is filled between an outer peripheral surface of the coil wire and an inner peripheral surface of the first coil guide part; and a second coil guide part 93 which is provided on the first surface, and on which the first coil guide part is opened.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to an electric pump.

Background Art

[0002] Patent Document 1 describes a configuration in which a motor compartment provided with a stator and a rotor of a DC motor is filled with oil, and the motor compartment and an electronic component compartment in which a circuit board is arranged are partitioned by a seal member (the wall of the housing member). In this configuration, the winding of the stator and the circuit board are connected via a terminal (guide plate).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described configuration, a seal member having a wall for suppressing the intrusion of oil from the motor side to the circuit board side, a terminal for connecting the winding to the circuit board, etc. are required. For this reason, it becomes an obstacle to reducing the number of parts, and there is a problem that it is difficult to reduce costs, miniaturize, and improve assemblability.

[0005] In view of the above circumstances, one object of the present invention is to provide an electric pump capable of reducing the number of parts and achieving cost reduction, miniaturization, and improvement of assemblability.

Means for Solving the Problems

[0006] One aspect of the electric pump of the present invention includes a motor having a rotor part and a stator part that are rotatable about a central axis extending in the axial direction, a circuit board provided on one axial side of the motor, a pump mechanism connected to the rotor part on the other axial side of the motor, a housing provided with a housing space for housing the motor, the pump mechanism, and the circuit board, and a seal member that seals and partitions the housing space between the motor and the circuit board. The stator part has a coil wire that extends out on one axial side and is connected to the circuit board. The seal member has a first surface facing the motor, a second surface facing the circuit board, a first coil guide portion that penetrates the seal member in the axial direction, a potting material filled between the outer peripheral surface of the coil wire and the inner peripheral surface of the first coil guide portion, and a second coil guide portion provided on the first surface and having an opening for the first coil guide portion.

Advantages of the Invention

[0007] According to one aspect of the present invention, an electric pump is provided that can reduce the number of parts, reduce costs, miniaturize, and improve assemblability.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0009] In the following description, the direction in which the Z-axis extends in each figure is defined as the vertical direction. The side to which the arrow of the Z-axis points (+Z side) is referred to as the "upper side", and the side opposite to the side to which the arrow of the Z-axis points (-Z side) is referred to as the "lower side". The central axis J1 shown in the following figures is a virtual axis extending parallel to the Z-axis. Unless otherwise specified, the direction parallel to the axial direction of the central axis J1, that is, the Z-axis direction, is simply referred to as the "axial direction", the radial direction centered on the central axis J1 is simply referred to as the "radial direction", and the circumferential direction centered on the central axis J1 is simply referred to as the "circumferential direction". Among the radial directions, the direction approaching the central axis J1 is referred to as the inner radial direction, and the direction away from the central axis J1 is referred to as the outer radial direction. Note that in the present embodiment, the "parallel direction" includes a substantially parallel direction, and the "orthogonal direction" includes a substantially orthogonal direction. In the present embodiment, the upper side corresponds to "one side in the axial direction", and the lower side corresponds to "the other side in the axial direction".

[0010] Note that the vertical direction, the upper side, and the lower side are merely names for explaining the relative positional relationship of each part, and the actual arrangement relationship or the like may be an arrangement relationship or the like other than the arrangement relationship indicated by these names.

[0011] The pump 10 of the present embodiment shown in FIG. 1 is, for example, an electric pump mounted on a vehicle. The pump 10 sends fluid inside the vehicle. The fluid sent by the pump 10 is, for example, oil. The oil is, for example, ATF (Automatic Transmission Fluid). As shown in FIG. 1, the pump 10 of the present embodiment includes a motor 20, a pump mechanism 30, a housing 40, a circuit board 50, and a coil guide (sealing member) 90.

[0012] The motor 20, the pump mechanism 30, and the circuit board 50 are housed inside the housing 40. The housing 40 has a housing main body portion 41, a cover 42, and a pump cover 43. An accommodation space S for accommodating the motor 20, the pump mechanism 30, and the circuit board 50 is provided inside the housing 40.

[0013] The housing main body 41 has a motor housing 44 and a pump housing 45. In the present embodiment, the motor housing 44 and the pump housing 45 are parts of the same single member with respect to each other.

[0014] In the present embodiment, the motor housing 44 has a cylindrical tubular portion 44c extending in the axial direction. The motor housing 44 is arranged on the upper side (one side) in the axial direction with respect to the pump housing 45 in the axial direction. The tubular portion 44c is open at the top and bottom and has a motor accommodation recess 44a that constitutes a part of the accommodation space S. The motor 20 is accommodated inside the motor accommodation recess 44a in the radial direction.

[0015] The pump housing 45 is connected to the lower side of the motor housing 44. The pump housing 45 is composed of a recess that opens downward and has a pump accommodation recess 45a that constitutes a part of the accommodation space S. The lower opening of the pump accommodation recess 45a is closed by the pump cover 43. The pump mechanism 30 is accommodated inside the pump accommodation recess 45a in the radial direction.

[0016] The pump cover 43 is attached to the bottom of the pump housing 45 by a plurality of bolts (not shown). The pump cover 43 has a cylindrical protruding portion 46 that extends downward (the other side in the axial direction). The protruding portion 46 extends downward from the bottom of the pump cover 43. The protruding portion 46 has a lower recess 46c. The lower recess 46c is recessed upward from the lower end of the protruding portion 46.

[0017] The protruding portion 46 has an inlet 46a. The inlet 46a extends axially about the second central axis J2. The second central axis J2 is disposed at a position radially offset from the central axis J1. The second central axis J2 and the central axis J1 extend parallel to each other. The lower end of the inlet 46a opens facing the lower recess 46c. The inlet 46a communicates the internal space of the pump housing recess 45a and the lower recess 46c. The inlet 46a is constituted by a hole that axially penetrates the pump cover 43. The inlet 46a allows oil to flow into the pump mechanism 30. That is, the pump mechanism 30 sucks oil from outside the apparatus through the inlet 46a.

[0018] The protruding portion 46 has an outlet 46b. The outlet 46b extends axially about the central axis J1. The lower end of the outlet 46b opens facing the lower recess 46c. The outlet 46b communicates the axial through-hole 22h of the shaft 22, which will be described later, and the lower recess 46c. The outlet 46b is constituted by a hole that axially penetrates the pump cover 43. The outlet 46b allows the oil that has flowed into the motor housing recess 44a from the pump mechanism 30 to flow out through the axial through-hole 22h.

[0019] The housing main body portion 41 has a through-hole 41c that axially connects the inside of the motor housing recess 44a and the inside of the pump housing recess 45a. A shaft 22, which will be described later, is inserted into the through-hole 41c. A sliding bearing 41j that rotatably supports the shaft 22 about the central axis J1 is provided on a part of the inner peripheral surface of the through-hole 41c in the axial direction.

[0020] A cover engagement groove 41m is provided at the upper end of the housing main body portion 41. The cover engagement groove 41m is continuous in the circumferential direction about the central axis J1 on the outer peripheral surface of the housing main body portion 41.

[0021] The cover 42 integrally has a cover main body 42a, a cover cylindrical portion 42b, and a flange 42c. The cover main body 42a is plate-shaped and is arranged along a plane orthogonal to the axial direction. The cover cylindrical portion 42b projects downward along the axial direction from the outer peripheral portion of the cover main body 42a. A plurality of engaging claws 47 are provided at the lower end of the cover cylindrical portion 42b. The plurality of engaging claws 47 are arranged at intervals in the circumferential direction. Each engaging claw 47 extends downward from the cover cylindrical portion 42b. Each engaging claw 47 is engaged with the cover engaging groove 41m of the housing main body portion 41. The cover 42 is attached to the housing main body portion 41 by engaging the plurality of engaging claws 47 with the cover engaging groove 41m. The cover 42 closes the motor housing recess 44a of the housing main body portion 41 from above. The cover 42 has a board housing recess 42s that forms a part of the accommodation space S and houses the circuit board 50 inside the radial direction of the cover cylindrical portion 42b.

[0022] The flange 42c projects radially outward from the outer peripheral portion of the cover main body 42a. A plurality of flanges 42c are provided at intervals in the circumferential direction on the outer peripheral portion of the cover main body 42a. Each flange 42c is fixed to the attachment target portion by bolts (not shown).

[0023] A connector portion 80 is provided on the cover 42. The connector portion 80 projects upward on one side in the axial direction from the cover 42. The connector portion 80 is connected to the circuit board 50, and for example, an external power source is connected thereto. Thereby, the circuit board 50 can supply the power supplied from the connector portion 80 to the stator portion 26 described later.

[0024] The motor 20 is housed in the motor housing recess 44a. The motor 20 has a rotor portion 21 and a stator portion 26.

[0025] The rotor portion 21 rotates about the central axis J1. The rotor portion 21 has a shaft 22 and a rotor core 23. The shaft 22 extends along the central axis J1. The shaft 22 is rotatable about the central axis J1. The lower end portion of the shaft 22 projects into the pump housing recess 45a through the through hole 41c and is connected to the pump mechanism 30. The shaft 22 has an axial through-hole 22h. The axial through-hole 22h extends along the axis. The upper end of the axial through-hole 22h opens upward of the rotor portion 21. The lower end of the axial through-hole 22h opens at the outlet 46b.

[0026] At least a part of the oil flowing in from the inlet 46a flows into the motor housing recess 44a through the gap between the inner peripheral surface of the through-hole 41c and the outer peripheral surface of the shaft 22 from the pump housing recess 45a. The motor 20 is immersed in the oil that has flowed into the motor housing recess 44a. The oil in the motor housing recess 44a flows into the axial through-hole 22h that opens at the upper end of the shaft 22. The oil that has flowed into the axial through-hole 22h flows downward in the axial through-hole 22h and flows out from the outlet 46b.

[0027] The rotor core 23 is fixed to the outer peripheral surface of the shaft 22. The rotor core 23 is annular with the central axis J1 as the center. The rotor core 23 is cylindrical and extends in the axial direction. The rotor core 23 is constituted by, for example, laminating a plurality of electromagnetic steel sheets in the axial direction.

[0028] The stator portion 26 is disposed radially outside the rotor portion 21 and faces the rotor portion 21 with a radial gap therebetween. That is, the stator portion 26 faces the rotor portion 21 in the radial direction. The stator portion 26 surrounds the rotor portion 21 from the radially outside over the entire circumference in the circumferential direction. The stator portion 26 has a stator core 27 and a plurality of coils 29.

[0029] The stator core 27 is annular with the central axis J1 as the center. The stator core 27 is cylindrical and extends in the axial direction. The stator core 27 surrounds the rotor portion 21 from the radially outside. The stator core 27 is disposed radially outside the rotor portion 21 and faces the rotor portion 21 with a radial gap therebetween. The stator core 27 is constituted by, for example, laminating a plurality of electromagnetic steel sheets in the axial direction. The radially outer surface of the stator core 27 is fixed to the inner peripheral surface of the cylindrical portion 44c.

[0030] The plurality of coils 29 are attached to the stator core 27 via the insulator 28. That is, the plurality of coils 29 are attached to the stator core 27 via the insulator 28. The material of the insulator 28 is an insulating material such as resin. The plurality of coils 29 are each constituted by winding the coil wire 29c around each of a plurality of teeth (not shown) provided on the stator core 27 via the insulator 28.

[0031] The motor 20 of this embodiment is a three-phase motor. The plurality of coils 29 include U-phase, V-phase, and W-phase coils. Each coil 29 is connected to a portion corresponding to any one of the U-phase, V-phase, and W-phase of the circuit board 50. As shown in FIG. 2, the coil wire 29c of each coil 29 extends upward from the coil 29 and is connected to the circuit board 50 via a coil guide 90 described later.

[0032] As shown in FIG. 1, the pump mechanism 30 is driven by the motor 20. The pump mechanism 30 is disposed below the stator portion 26. The pump mechanism 30 is connected to the shaft 22 of the rotor portion 21. In this embodiment, the pump mechanism 30 has a trochoid pump structure. The pump mechanism 30 includes an inner rotor 30a and an outer rotor 30b located radially outside the inner rotor 30a. The inner rotor 30a and the outer rotor 30b are pump gears and mesh with each other. The inner rotor 30a and the outer rotor 30b each have a trochoid tooth profile. The inner rotor 30a is fixed to the end portion on the other axial side of the shaft 22. In this way, the pump mechanism 30 is driven by the rotation of the inner rotor 30a together with the shaft 22.

[0033] As shown in FIG. 2, the circuit board 50 has a base material 55. The circuit board 50 is located on one axial side of the motor 20. The base material 55 is plate-shaped with its plate surface facing the axial direction. The base material 55 is supported from the other axial side by a coil guide 90 described later. The base material 55 is positioned on the coil guide 90 by pins 56 provided on the coil guide 90.

[0034] To the base material 55, the tips of the coil wires 29c of the coils 29 of each phase constituting the stator portion 26 are electrically connected. In the present embodiment, to the base material 55, the coil wires 29c of the stator portion 26 are connected at three locations spaced circumferentially on the outer peripheral portion of the circuit board 50. At each location of the circuit board 50, two coil wires 29c are arranged. Each coil wire 29c is a part of one of the coils 29 of the U-phase, V-phase, and W-phase.

[0035] On the base material 55 of the circuit board 50, a plurality of electronic components 57, a heat dissipation material 70, etc. are provided. The electronic component 57 is, for example, a capacitor. As the electronic component 57, in addition to a capacitor, algae, a processor, an inverter, etc. can be mounted on the base material 55. The inverter is electrically connected to the stator portion 26 via the coil wire 29c of the coil 29 connected to the circuit board 50. That is, the coil wire 29c extends axially on one side and is connected to the circuit board 50.

[0036] The heat dissipation material 70 dissipates the heat of the heat generating members such as a processor, an inverter, etc. that generate heat during pump driving. The heat dissipation material 70 includes, for example, a material having a high thermal conductivity such as an aluminum-based material or a copper-based material. The heat dissipation material 70 may be in contact with the cover body 42a of the cover 42.

[0037] As shown in FIG. 1, the cover 42 has a plurality of heat dissipation fins 42f and a component housing convex portion 42p. The plurality of heat dissipation fins 42f are provided so as to protrude upward from the cover body 42a. The component housing convex portion 42p is provided by a part of the cover body 42a being recessed upward. Inside the component housing convex portion 42p, for example, the electronic component 57 is housed.

[0038] The coil guide 90 guides the coil wire 29c. The coil guide 90 is provided on the lower side of the circuit board 50. The coil guide 90 is disposed between the stator portion 26 and the circuit board 50. The coil guide 90 holds the coil wire 29c that extends upward from the winding portion of the coil 29. The coil guide 90 seals and partitions the accommodation space S between the motor 20 and the circuit board 50. The coil guide 90 is made of an insulating resin material. As shown in FIGS. 3 to 6, the coil guide 90 includes a coil guide body (sealing member body) 91, a first coil guiding portion 92, a second coil guiding portion 93, and a potting region 94.

[0039] The coil guide body 91 is provided along a plane perpendicular to the axis. The coil guide body 91 is disc-shaped when viewed from the axial direction. The coil guide body 91 is provided at the upper end of the housing main body portion 41 so as to close the opening of the cover cylindrical portion 42b. The coil guide body 91 is sandwiched between the cylindrical portion 44c of the housing main body portion 41 and the cover cylindrical portion 42b of the cover 42. The coil guide body 91 faces downward in the axial direction and has a lower surface (opposing surface, first surface) 91a facing the motor 20 and an upper surface (second surface) 91b facing the circuit board 50.

[0040] The first coil guiding portion 92 penetrates the coil guide body 91 in the axial direction and holds the coil wire 29c. The first coil guiding portion 92 guides the coil wire 29c along the axial direction. As shown in FIGS. 2 to 5, in the present embodiment, three pairs of the first coil guiding portions 92 are provided corresponding to the U-phase, V-phase, and W-phase coils 29. The three pairs of the first coil guiding portions 92 are arranged at intervals in the circumferential direction on the outer peripheral portion of the first coil guiding portion 92. As shown in FIGS. 1, 3 to 5, each first coil guide portion 92 is a through-hole 92h that axially penetrates the coil guide body 91. The first coil guide portion 92 may be, for example, a notch provided so as to be recessed radially inward from the outer peripheral portion of the coil guide body 91 as long as it axially penetrates the coil guide body 91 and can hold the coil wire 29c. The aperture diameter of the first coil guide portion 92 (through-hole 92h) is preferably 1.5 times or less the wire diameter of the coil wire 29c. In the present embodiment, the aperture diameter of the first coil guide portion 92 is, for example, 1.4 mm, and the wire diameter of the coil wire 29c is, for example, 1 mm. Thereby, a gap with a total diameter of 0.4 mm is formed between the inner peripheral surface of the first coil guide portion 92 and the outer peripheral surface of the coil wire 29c.

[0041] As shown in FIGS. 3 to 5, the second coil guide portion 93 is provided on the lower surface 91a of the coil guide body 91. The second coil guide portion 93 guides the coil wire 29c inserted into the through-hole 92h toward the opening of the through-hole 92h of the first coil guide portion 92 during the assembly of the pump 10. The second coil guide portion 93 has an inclined surface 93a and a surrounding rib 93r. That is, the second coil guide portion 93 is, at least in part, the inclined surface 93a.

[0042] As shown in FIG. 4, the inclined surface 93a is substantially teardrop-shaped (teardrop type) when viewed from the axial direction and extends in the circumferential direction. The opening of the through-hole 92h opens at one end in the circumferential direction of the inclined surface 93a. Thereby, the second coil guide portion 93 opens to the first coil guide portion 92. That is, the coil guide 90 has three pairs of second coil guide portions 93 and three pairs of first coil guide portions 92. Each pair of the three pairs of second coil guide portions 93 are arranged adjacent to each other when viewed from the axial direction.

[0043] The opening of the first coil guide portion 92 is located at one end or the other end in the circumferential direction in the second coil guide portion 93. Each of the pair of second coil guide portions 93 is arranged at the end on the side of the second coil guide portion 93 adjacent to the opening of the first coil guide portion 92. In each pair of the three pairs of second coil guide portions 93 provided, the second coil guide portion 93A located on one side in the circumferential direction and the second coil guide portion 93B located on the other side in the circumferential direction are arranged such that the openings of the first coil guide portion 92 are adjacent to each other. That is, the opening of the second coil guide portion 93A is located at the end on the other side in the circumferential direction on the inclined surface 93a of the second coil guide portion 93A. The opening of the second coil guide portion 93B is located at the end on one side in the circumferential direction on the inclined surface 93a of the second coil guide portion 93B.

[0044] The width d of the inclined surface 93a as viewed from the axial direction becomes narrower as it goes toward the opening of the first coil guide portion 92 in the circumferential direction. The inclined surface 93a is inclined toward one side (upper side) in the axial direction as it goes toward the opening of the first coil guide portion 92 in the circumferential direction. As shown in FIG. 5, the inclined surface 93a is inclined at a steep gradient as it approaches the first coil guide portion 92. That is, the inclination angle of the inclined surface 93a increases as it approaches the first coil guide portion 92. The inclined surface 93a is curved in an arc shape in the circumferential direction from the position farthest from the opening toward the opening in a cross-sectional view along the axial direction. Note that the inclined surface 93a may be inclined upward as it goes toward the opening of the first coil guide portion 92 in the radial direction.

[0045] As shown in FIGS. 3 and 4, the surrounding rib 93r is provided so as to surround the inclined surface 93a of the second coil guide portion 93 when viewed from the axial direction. The surrounding rib 93r is in a cylindrical shape protruding downward (the other side in the axial direction) from the lower surface 91a of the coil guide body 91. The three pairs of surrounding ribs 93r surrounding the three pairs of second coil guide portions 93 are connected to each other and provided continuously in the circumferential direction.

[0046] The coil guide 90 has an insertion cylinder portion (insertion portion) 97, a ridge portion 98, a circumferential rib 95a, and a radial rib 96a. The insertion cylinder portion 97, the ridge portion 98, the circumferential rib 95a, and the radial rib 96a are provided on the lower surface 91a of the coil guide body 91.

[0047] The insertion cylinder portion 97 extends continuously in the circumferential direction from one circumferential end side of the three pairs of surrounding ribs 93r and is connected to the other circumferential end side of the three pairs of surrounding ribs 93r. By including the three pairs of surrounding ribs 93r in a part of the circumferential direction, the insertion cylinder portion 97 is continuous over the entire circumference in the circumferential direction. The insertion cylinder portion 97 protrudes downward from the lower surface 91a. The insertion cylinder portion 97 is disposed inside the cylindrical portion 44c at the upper end portion of the housing main body portion 41. That is, the insertion cylinder portion 97 is inserted into the cylindrical portion 44c.

[0048] The ridge portion 98 is provided on the outer peripheral surface of the insertion cylinder portion 97. The ridge portions 98 are provided at intervals in the circumferential direction of the insertion cylinder portion 97. Each ridge portion 98 protrudes radially outward from the outer peripheral surface of the insertion cylinder portion 97 and extends along the axial direction. The ridge portion 98 has a tip surface 98b and a tapered portion 98a. The tip surface 98b faces radially outward and extends parallel to the axial direction. The tip surface 98b contacts the inner peripheral surface of the cylindrical portion 44c. The tapered portion 98a is continuously provided below the tip surface 98b. The tapered portion 98a is provided at the lower end portion (the other axial side) of the ridge portion 98. The tapered portion 98a gradually decreases in the protruding height radially outward from the insertion cylinder portion 97 toward the lower side (the other axial end side). By providing such a tapered portion 98a, the insertion cylinder portion 97 of the coil guide 90 can be easily inserted inside the cylindrical portion 44c. When the tip surface 98b of the ridge portion 98 abuts against the inner peripheral surface of the cylindrical portion 44c, the coil guide 90 is attached to the housing main body portion 41. In the present embodiment, the case where the ridge portion 98 is provided on the outer peripheral surface of the cylindrical insertion cylinder portion 97 has been described. However, the ridge portion may not be cylindrical as long as it is a part (insertion portion) of the coil guide 90 inserted into the cylindrical portion 44c.

[0049] The circumferential rib 95a is provided radially inward with respect to the insertion cylinder portion 97. The circumferential rib 95a is annular when viewed from the axial direction and extends along the circumferential direction. A plurality of radial ribs 96a are provided at intervals in the circumferential direction on the lower surface 91a of the coil guide body 91. The plurality of radial ribs 96a extend radially from the central portion of the lower surface 91a. Each radial rib 96a extends along the radial direction. The radial rib 96a, the circumferential rib 95a, and the insertion cylinder portion 97 are connected to each other. The insertion cylinder portion 97, the protrusion portion 98, the circumferential rib 95a, and the radial rib 96a have the same protruding dimension downward from the lower surface 91a as that of the surrounding rib 93r.

[0050] As shown in FIGS. 5 and 6, the potting region 94 is provided on the lower surface 91a or the upper surface 91b of the coil guide body 91. In the present embodiment, the potting region 94 is provided on the upper surface 91b of the coil guide body 91. The through hole 92h of the first coil guide portion 92 opens in the potting region 94. The coil guide 90 has three potting regions 94. The three potting regions 94 are provided at intervals in the circumferential direction on the outer peripheral portion of the coil guide body 91. The three potting regions 94 are arranged at positions corresponding to three pairs of first coil guide portions (coil guide portions) 92 with the coil guide body 91 interposed therebetween. A pair of first coil guide portions 92 open in one potting region 94. Each potting region 94 is, for example, an oval shape extending in the circumferential direction when viewed from the axial direction. A peripheral wall 94r protruding upward from the upper surface 91b of the coil guide body 91 is provided on the outer peripheral portion of each potting region 94. The potting region 94 is filled with a potting material 99.

[0051] On the upper surface 91b of the coil guide body 91, a circumferential rib 95b and a radial rib 96b are provided. The circumferential rib 95b is annular when viewed from the axial direction and extends along the circumferential direction. In the present embodiment, the circumferential rib 95b is provided in a double layer in the radial direction with different diameters. The radial ribs 96b are provided on the upper surface 91b of the coil guide body 91 at intervals in the circumferential direction. The plurality of radial ribs 96b extend radially from the central portion of the upper surface 91b. Each radial rib 96b extends along the radial direction. The radial rib 96b and the circumferential rib 95b are connected to each other.

[0052] As shown in FIG. 1, the coil wires 29c of the coils 29 of the U-phase, V-phase, and W-phase are inserted downward into the through-holes 92h of the three pairs of first coil guides 92 and protrude above the coil guide body 91. Each coil wire 29c is inserted into a through-hole provided in a circuit board 50 disposed above the coil guide body 91 and is electrically connected to a circuit on the circuit board 50. In the portion where the coil wire 29c penetrates the through-hole 92h, the gap between the through-hole 92h and the coil wire 29c is sealed by filling the potting region 94 with a potting material 99.

[0053] In the present embodiment, the end portion of the coil wire 29c protrudes above the circuit board 50. A temperature sensor 59 connected to the coil wire 29c is provided on the circuit board 50. The temperature sensor 59 measures the temperature of the end portion of the coil wire 29c connected to the circuit board 50. The coil 29 immersed in the oil in the motor housing recess 44a reaches a temperature substantially equal to that of the oil over time. This temperature is propagated through the coil 29. Thereby, by detecting the temperature of the coil wire 29c with the temperature sensor 59, the temperature of the oil in the housing 40 is detected.

[0054] According to the present embodiment, the coil guide 90 disposed between the motor 20 and the circuit board 50 has a first coil guiding portion 92 that axially penetrates the coil guide main body 91 and holds the coil wire 29c. Thereby, the coil wire 29c can be held and directly connected to the circuit board 50 without using a bus bar or a connection terminal. Therefore, an increase in the size of the pump 10 in the axial direction can be suppressed, and the pump 10 can be downsized. Further, by having the second coil guiding portion 93 through which the first coil guiding portion 92 opens, the coil wire 29c drawn out from the stator portion 26 can be easily guided to the opening portion of the first coil guiding portion 92. Also, a potting material 99 is filled between the outer peripheral surface of the coil wire 29c and the inner peripheral surface of the first coil guiding portion 92. Thereby, in addition to the function of holding the coil wire 29c, the coil guide 90 has a sealing function of the coil wire 29c in the first coil guiding portion 92. As a result, it is not necessary to provide a bus bar, a connection terminal, and a sealing member, respectively. Therefore, the number of parts of the pump 10 can be reduced, and cost reduction, downsizing, and improvement in assemblability can be achieved.

[0055] According to the present embodiment, since the first coil guiding portion 92 is a through hole 92h, the coil wire 29c can be reliably held in the axial direction by passing the coil wire 29c through the through hole 92h.

[0056] According to the present embodiment, the hole diameter of the first coil guiding portion 92 is 1.5 times or less the wire diameter of the coil wire 29c. Thereby, by keeping the gap between the first coil guiding portion 92 and the coil wire 29c small, the coil wire 29c is reliably held in the first coil guiding portion 92. Further, when the potting material 99 is filled so as to close the gap between the first coil guiding portion 92 and the coil wire 29c, it is possible to suppress the potting material 99 from leaking from the gap between the first coil guiding portion 92 and the coil wire 29c.

[0057] According to this embodiment, the potting region 94 where the first coil guide portion 92 opens is filled with the potting material 99. Thereby, the potting material 99 can be easily filled between the outer peripheral surface of the coil wire 29c and the inner peripheral surface of the first coil guide portion 92.

[0058] According to this embodiment, since a pair of first coil guide portions 92 open into one potting region 94, the coil wires 29c in the same phase can be potted together, and the workability can be improved.

[0059] According to this embodiment, it has an inclined surface 93a that inclines toward one side in the axial direction as it goes toward the opening of the first coil guide portion 92. Thereby, the coil wire 29c drawn out from the stator portion 26 can be easily guided to the opening along the inclined surface 93a. Further, since the width d of the second coil guide portion 93 becomes narrower as it goes toward the opening of the first coil guide portion 92, if the coil wire 29c is applied to the portion where the width d of the second coil guide portion 93 is wide, the coil wire 29c can be easily guided to the opening. Therefore, the coil wire 29c can be inserted into the opening and can be easily and surely held.

[0060] According to this embodiment, the opening of the first coil guide portion 92 is located at one end in the circumferential direction or the other end in the second coil guide portion 93. Thereby, an increase in the size of the coil guide 90 in the radial direction can be suppressed.

[0061] According to this embodiment, the coil guide 90 has an insertion cylinder portion 97 disposed inside the cylindrical portion 44c of the housing 40, and a protrusion portion 98 provided on the outer peripheral surface of the insertion cylinder portion 97. Thereby, when fixing the coil guide 90 to the housing 40 to the housing 40, the positioning in the radial direction of the coil guide 90 can be easily achieved.

[0062] According to this embodiment, since the taper portion 98a is provided on the protrusion portion 98, the coil guide 90 can be easily inserted into the housing 40.

[0063] According to the present embodiment, by providing the circumferential rib 95a and the radial rib 96a, the strength of the coil guide 90 can be increased.

[0064] According to the present embodiment, the pair of second coil guides 93 are arranged adjacent to each other when viewed axially, and in each second coil guide 93, the opening of the first coil guide 92 is arranged at the end on the side of the second coil guide 93 adjacent thereto. Thereby, the coil guide 90 can hold the pair of in-phase coil wires 29c close to each other. Since the pair of in-phase coil wires 29c can be brought close to each other and connected to the circuit board 50, the connection work of the coil wires 29c to the circuit board 50 becomes easy.

[0065] According to the present embodiment, the coil guide 90 has an enclosing rib 93r that encloses the second coil guide 93. Thereby, the coil guide 90 can be reinforced. Further, the enclosing rib 93r can secure the depth of the second coil guide 93, so that the coil wire 29c can be prevented from coming off the second coil guide 93. In addition, the inclination of the inclined surface 93a can be easily made steep, and the coil wire 29c can be easily guided to the first coil guide 92.

[0066] According to the present embodiment, since the inclined surface 93a inclines with a steep gradient as it approaches the first coil guide 92, the coil wire 29c can be more easily guided to the first coil guide 92.

[0067] According to the present embodiment, since the inclined surface 93a is curved in an arc shape, the coil wire 29c can be more easily guided to the first coil guide 92.

[0068] According to this embodiment, a temperature sensor 59 for measuring the temperature of the end portion of the coil wire 29c connected to the circuit board 50 is provided. As a result, it is not necessary to provide the temperature sensor 59 within the motor housing recess 44a, nor is it necessary to secure space for providing the temperature sensor 59. Thereby, an increase in the size of the pump 10 can be suppressed. Further, when the temperature sensor 59 is disposed within the motor housing recess 44a, a seal structure is required at the portion where the lead wire from the temperature sensor 59 penetrates the coil guide 90. However, by connecting the temperature sensor 59 to the circuit board 50, the seal structure becomes unnecessary.

[0069] As described above, one embodiment of the present invention and its modification have been described. However, each configuration and their combinations in the embodiment and the modification are merely examples, and additions, omissions, substitutions, and other changes to the configuration are possible without departing from the spirit of the present invention. Further, the present invention is not limited by the embodiment.

[0070] For example, the application of the electric pump in the above-described embodiment and its modification is not particularly limited.

Description of Reference Numerals

[0071] 10... Pump, 20... Motor, 21... Rotor portion, 26... Stator portion, 29... Coil, 29c... Coil wire, 30... Pump mechanism, 40... Housing, 41c... Through hole, 44c... Cylindrical portion, 50... Circuit board, 92... First coil guiding portion, 92h... Through hole, 93, 93A, 93B... Second coil guiding portions, 93a... Inclined surface, 94... Potting region, 95a... Circumferential rib, 96a... Radial rib, 97... Insertion cylindrical portion (insertion portion), 98... Protrusion, 98a... Taper portion, 98b... Tip surface, 99... Potting material, J1... Central axis, S... Accommodation space

Claims

1. A motor as a three-phase motor having a rotor part and a stator part rotatable about a central axis extending in the axial direction, A circuit board provided on one side in the axial direction of the motor, A pump mechanism connected to the rotor part on the other side in the axial direction of the motor, A housing provided with an accommodation space for accommodating the motor, the pump mechanism, and the circuit board, A sealing member for sealing and partitioning the accommodation space between the motor and the circuit board, and comprising: The stator part has three pairs of coil wires of U-phase, V-phase, and W-phase extending to one side in the axial direction and connected to the circuit board, The sealing member, A first surface facing the motor and a second surface facing the circuit board, A first coil guide portion penetrating the sealing member in the axial direction, A potting material filled between the outer peripheral surface of the coil wire and the inner peripheral surface of the first coil guide portion, A second coil guide portion provided on the first surface and having an opening for the first coil guide portion, The sealing member has a potting region provided on the second surface and having an opening for the first coil guide portion, The potting region is filled with the potting material, The sealing member has three pairs of the first coil guide portions and three of the potting regions, One of the potting regions has openings for a pair of the first coil guide portions, A pair of coil wires of the same phase are arranged in one of the potting regions, Coil wires of different phases are arranged in different potting regions from each other, An electric pump.

2. The first coil guide portion is a through hole, The electric pump according to Claim 1.

3. The aperture diameter of the first coil guide portion is 1.5 times or less the wire diameter of the coil wire, the electric pump according to Claim 2.

4. The second coil guide portion is an inclined surface inclined toward one side in the axial direction as it approaches the opening of the first coil guide portion, The electric pump according to any one of Claims 1 to 3.

5. The opening of the first coil guide portion is located at an end on one side or the other side in the circumferential direction in the second coil guide portion, The electric pump according to any one of Claims 1 to 4.

6. The housing has a cylindrical portion surrounding the motor, The sealing member, An insertion portion inserted into the cylindrical portion, A ridge portion provided on the outer peripheral surface of the insertion portion and protruding radially outward and extending along the axial direction, The front end surface on the radially outer side of the protrusion portion contacts the inner peripheral surface of the cylindrical portion. The electric pump according to any one of claims 1 to 5.

7. At the end portion on the other axial side of the protrusion portion, a tapered portion is provided that decreases the protrusion height as it goes toward the other axial side. The electric pump according to claim 6.

8. The seal member has a circumferential rib provided on at least one of the first surface and the second surface and extending along the circumferential direction, and a radial rib provided on at least one of the first surface and the second surface and extending along the radial direction, and the circumferential rib and the radial rib are connected to each other. The electric pump according to any one of claims 1 to 7.

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