JP7715545B2 - electric pump - Google Patents

Description

The present invention relates to an electric pump.

Patent Document 1 describes a configuration in which a motor compartment containing the stator and rotor of a DC motor is filled with oil, and the motor compartment is separated from an electronic component compartment containing a circuit board by a sealing member (wall of the housing member). In this configuration, the stator windings and the circuit board are connected via terminals (guide plates).

JP 2016-77141 A

The above configuration requires a sealing member with a wall to prevent oil from seeping from the motor side to the circuit board side, and terminals to connect the windings to the circuit board. This hinders efforts to reduce the number of parts, making it difficult to reduce costs, make the motor more compact, and improve assembly ease.

In light of the above circumstances, one of the objects of the present invention is to provide an electric pump that reduces the number of parts, thereby reducing costs, making it more compact, and improving assembly ease.

One aspect of the electric pump of the present invention comprises a motor having a rotor portion and a stator portion rotatable around 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 portion on the other axial side of the motor; a housing provided with an accommodation space that accommodates the motor, the pump mechanism, and the circuit board; and a seal member that seals and partitions the accommodation space between the motor and the circuit board. The stator portion has a coil wire that extends axially to one side and is connected to the circuit board. The seal member has a first surface facing the motor and a second surface facing the circuit board. The seal member has a coil guide portion that penetrates in the axial direction and guides the coil wire along the axial direction; a potting region provided on the first surface or the second surface where the coil guide portion opens; and a potting material that fills the potting region.

One aspect of the present invention provides an electric pump that reduces the number of parts, thereby reducing costs, making it more compact, and improving assembly ease.

FIG. 1 is a vertical cross-sectional view showing an electric pump according to an embodiment. FIG. 2 is a perspective view of the electric pump of the embodiment with the cover removed. FIG. 3 is a view of the coil guide of the electric pump according to the embodiment, viewed obliquely from below. FIG. 4 is a bottom view of a coil guide according to one embodiment. FIG. 5 is a cross-sectional view of the second coil guide portion, the first coil guide portion, and the potting region of the coil guide of one embodiment. FIG. 6 is a top view of one embodiment of a coil guide.

In the following description, the direction in which the Z axis in each figure extends is referred to as the up-down direction, the side toward which the Z axis arrow points (+Z side) is referred to as the "upper side," and the opposite side of the Z axis arrow (-Z side) is referred to as the "lower side." The central axis J1 in the following figures is an imaginary axis extending parallel to the Z axis. Unless otherwise specified, the direction parallel to the axial direction of the central axis J1, i.e., the Z axis direction, is referred to simply as the "axial direction," the radial direction centered on the central axis J1 is referred to simply as the "radial direction," and the circumferential direction centered on the central axis J1 is referred to simply as the "circumferential direction." Within the radial direction, the direction approaching the central axis J1 is referred to as the radially inner direction, and the direction away from the central axis J1 is referred to as the radially outer direction. Note that in this embodiment, "parallel direction" includes a direction that is approximately parallel, and "orthogonal direction" includes a direction that is approximately orthogonal. In this embodiment, the upper side corresponds to "one axial side," and the lower side corresponds to "the other axial side."

Note that the terms "upper/lower direction," "upper side," and "lower side" are simply names used to describe the relative positional relationships of the various parts, and the actual positional relationships may be different from those indicated by these names.

The pump 10 of this embodiment shown in FIG. 1 is, for example, an electric pump mounted on a vehicle.
The pump 10 pumps a fluid inside a vehicle. The fluid pumped by the pump 10 is, for example, oil. The oil is, for example, automatic transmission fluid (ATF). As shown in FIG. 1 , the pump 10 of this embodiment includes a motor 20, a pump mechanism 30, a housing 40, a circuit board 50, and a coil guide (seal member) 90.

The motor 20, pump mechanism 30, and circuit board 50 are housed within the housing 40. The housing 40 has a housing main body 41, a cover 42, and a pump cover 43. An accommodation space S is provided within the housing 40 to accommodate the motor 20, pump mechanism 30, and circuit board 50.

The housing main body 41 has a motor housing 44 and a pump housing 45. In this embodiment, the motor housing 44 and the pump housing 45 are part of the same single member.

In this embodiment, the motor housing 44 has a cylindrical tubular portion 44c that extends axially. The motor housing 44 is disposed axially above (on one side of) the pump housing 45. The tubular portion 44c has a motor accommodating recess 44a that is open at the top and bottom and forms part of the accommodation space S. The motor 20 is accommodated radially inside the motor accommodating recess 44a.

The pump housing 45 is connected to the lower side of the motor housing 44. The pump housing 45 is a recess that opens downward and has a pump accommodating recess 45a that constitutes part of the accommodating space S. The lower opening of the pump accommodating recess 45a is closed by the pump cover 43. The pump mechanism 30 is housed radially inside the pump accommodating recess 45a.

The pump cover 43 is attached to the bottom of the pump housing 45 with multiple bolts (not shown). The pump cover 43 has a cylindrical protrusion 46 that extends downward (toward the other axial direction). The protrusion 46 extends downward from the bottom of the pump cover 43. The protrusion 46 has a lower recess 46c. The lower recess 46c is recessed upward from the lower end of the protrusion 46.

The protrusion 46 has an inlet 46a. The inlet 46a extends axially around the second central axis J2. The second central axis J2 is positioned 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 toward the lower recess 46c. The inlet 46a connects the internal space of the pump accommodating recess 45a with the lower recess 46c. The inlet 46a is formed by a hole that penetrates the pump cover 43 in the axial direction. The inlet 46a allows oil to flow into the pump mechanism 30. In other words, the pump mechanism 30 draws oil from outside the device through the inlet 46a.

The protrusion 46 has an outlet 46b. The outlet 46b extends axially around the central axis J1. The lower end of the outlet 46b opens toward the lower recess 46c. The outlet 46b communicates with the lower recess 46c and a shaft through-hole 22h of the shaft 22 (described below). The outlet 46b is formed by a hole that penetrates the pump cover 43 in the axial direction. The outlet 46b allows oil that flows from the pump mechanism 30 into the motor accommodating recess 44a and passes through the shaft through-hole 22h to flow out.

The housing main body 41 has a through hole 41c that axially connects the interior of the motor accommodating recess 44a and the interior of the pump accommodating recess 45a. The shaft 22, described below, is inserted into the through hole 41c. A sliding bearing 41j is provided on part of the axial inner surface of the through hole 41c to support the shaft 22 rotatably around the central axis J1.

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

The cover 42 integrally includes a cover main body 42a, a cover cylindrical portion 42b, and a flange 42c.
The cover main body 42a is plate-shaped and arranged along a plane perpendicular to the axial direction. The cover tubular portion 42b protrudes axially downward from the outer periphery of the cover main body 42a. A plurality of engagement claws 47 are provided at the lower end of the cover tubular portion 42b. The plurality of engagement claws 47 are arranged at intervals in the circumferential direction. Each engagement claw 47 extends downward from the cover tubular portion 42b. Each engagement claw 47 engages with a cover engagement groove 41m in the housing main body 41. The cover 42 is attached to the housing main body 41 by engaging the plurality of engagement claws 47 with the cover engagement groove 41m. The cover 42 closes the motor accommodating recess 44a of the housing main body 41 from above. The cover 42 has a board accommodating recess 42s, which constitutes part of the accommodating space S and accommodates a circuit board 50, located radially inward of the cover tubular portion 42b.

The flanges 42c protrude radially outward from the outer periphery of the cover body 42a. Multiple flanges 42c are provided at intervals in the circumferential direction on the outer periphery of the cover body 42a. Each flange 42c is fixed to the mounting location with a bolt (not shown).

A connector portion 80 is provided on the cover 42. The connector portion 80 protrudes upward from the cover 42 in one axial direction. The connector portion 80 is connected to the circuit board 50, for example, to an external power source. This allows the circuit board 50 to supply power received from the connector portion 80 to the stator portion 26, which will be described later.

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

The rotor unit 21 rotates around a central axis J1 and includes a shaft 22 and a rotor core 23.
The shaft 22 extends along the central axis J1 and is rotatable about the central axis J1. A lower end of the shaft 22 protrudes into the pump accommodating recess 45a through the through-hole 41c and is connected to the pump mechanism 30.
The shaft 22 has a shaft through hole 22h. The shaft through hole 22h extends along the axis. The upper end of the shaft through hole 22h opens toward the upper side of the rotor portion 21. The lower end of the shaft through hole 22h opens to the outlet 46b.

At least a portion of the oil that flows in through the inlet 46a flows from the pump accommodating recess 45a through the gap between the inner circumferential surface of the through-hole 41c and the outer circumferential surface of the shaft 22, and into the motor accommodating recess 44a. The motor 20 is immersed in the oil that has flowed into the motor accommodating recess 44a. The oil in the motor accommodating recess 44a flows into the shaft through-hole 22h, which opens at the upper end of the shaft 22. The oil that has flowed into the shaft through-hole 22h flows downward within the shaft through-hole 22h and is discharged from the outlet 46b.

The rotor core 23 is fixed to the outer peripheral surface of the shaft 22. The rotor core 23 is annular and centered on the central axis J1. The rotor core 23 is cylindrical and extends in the axial direction. The rotor core 23 is formed, for example, by stacking multiple electromagnetic steel plates in the axial direction.

The stator portion 26 is disposed radially outside the rotor portion 21 and faces the rotor portion 21 with a radial gap between them. In other words, the stator portion 26 faces the rotor portion 21 in the radial direction. The stator portion 26 surrounds the rotor portion 21 from the radial outside around the entire circumferential circumference. The stator portion 26 has a stator core 27 and multiple coils 29.

The stator core 27 is annular and centered on the central axis J1. The stator core 27 is cylindrical and extends in the axial direction. The stator core 27 surrounds the rotor portion 21 from the radial outside. The stator core 27 is positioned radially outside the rotor portion 21 and faces the rotor portion 21 with a radial gap between them. The stator core 27 is formed, for example, by stacking multiple electromagnetic steel plates in the axial direction. The radially outer surface of the stator core 27 is fixed to the inner circumferential surface of the cylindrical portion 44c.

The multiple coils 29 are attached to the stator core 27 via insulators 28. The insulators 28 are made of an insulating material such as resin. Each of the multiple coils 29 is formed by winding a coil wire 29c around each of multiple teeth (not shown) provided on the stator core 27 via the insulators 28.

The motor 20 of this embodiment is a three-phase motor. The multiple coils 29 include U-phase, V-phase, and W-phase coils. Each coil 29 is connected to a portion of the circuit board 50 corresponding to one of the U-phase, V-phase, and W-phase. As shown in Figure 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, which will be described later.

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 outward of the inner rotor 30a. The inner rotor 30a and the outer rotor 30b are pump gears that 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 other axial end of the shaft 22. In this manner, the pump mechanism 30 is driven by the rotation of the inner rotor 30a together with the shaft 22.

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 below). The base material 55 is positioned relative to the coil guide 90 by a pin 56 provided on the coil guide 90.

The tips of the coil wires 29c of the coils 29 of each phase that make up the stator section 26 are electrically connected to the substrate 55. In this embodiment, the coil wires 29c of the stator section 26 are connected to the substrate 55 at three circumferentially spaced locations on the outer periphery of the circuit board 50. Two coil wires 29c are arranged at each location on the circuit board 50. Each coil wire 29c is part of one of the U-phase, V-phase, or W-phase coils 29.

The base material 55 of the circuit board 50 is provided with multiple electronic components 57, heat dissipation material 70, etc. The electronic components 57 are, for example, capacitors. Other electronic components 57 that can be mounted on the base material 55 include, for example, a capacitor, a processor, an inverter, etc. 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. In other words, the coil wire 29c extends axially to one side and is connected to the circuit board 50.

The heat dissipation material 70 dissipates heat from heat-generating components such as the processor and inverter that generate heat when the pump is running. The heat dissipation material 70 includes a material with 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.

As shown in FIG. 1, the cover 42 has multiple heat dissipation fins 42f and a component accommodating protrusion 42p. The multiple heat dissipation fins 42f are arranged to protrude upward from the cover body 42a. The component accommodating protrusion 42p is formed by recessing a portion of the cover body 42a upward. An electronic component 57, for example, is accommodated inside the component accommodating protrusion 42p.

The coil guide 90 guides the coil wire 29c. The coil guide 90 is provided below the circuit board 50. The coil guide 90 is positioned between the stator portion 26 and the circuit board 50. The coil guide 90 holds the coil wire 29c extending upward from the winding portion of the coil 29. The coil guide 90 seals and defines the housing 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 Figures 3 to 6, the coil guide 90 has a coil guide main body (sealing member main body) 91, a first coil guide portion 92, a second coil guide portion 93, and a potting region 94.

The coil guide body 91 is arranged along a plane perpendicular to the axis. When viewed in the axial direction, the coil guide body 91 is disk-shaped. The coil guide body 91 is arranged at the upper end of the housing body 41 so as to close the opening of the cover tubular portion 42b. The coil guide body 91 is sandwiched between the tubular portion 44c of the housing body 41 and the cover tubular 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 that faces the motor 20, and an upper surface (second surface) 91b that faces the circuit board 50.

The first coil guide portion 92 passes through the coil guide main body 91 in the axial direction and holds the coil wire 29c. The first coil guide portion 92 guides the coil wire 29c along the axial direction. As shown in Figures 2 to 5, in this embodiment, three pairs of first coil guide portions 92 are provided corresponding to the U-phase, V-phase, and W-phase coils 29. The three pairs of first coil guide portions 92 are arranged circumferentially spaced apart on the outer periphery of the first coil guide portion 92.
As shown in FIGS. 1 and 3 to 5 , each first coil guide portion 92 is a through-hole 92h that penetrates the coil guide main body 91 in the axial direction. As long as the first coil guide portion 92 penetrates the coil guide main body 91 in the axial direction and can hold the coil wire 29c, it may be, for example, a notch recessed radially inward from the outer periphery of the coil guide main body 91. The hole 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 this embodiment, the hole 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. This results in a gap of 0.4 mm in total diameter being formed between the inner circumferential surface of the first coil guide portion 92 and the outer circumferential surface of the coil wire 29c.

As shown in Figures 3 to 5, the second coil guide portion 93 is provided on the underside 91a of the coil guide main body 91. When assembling the pump 10, the second coil guide portion 93 guides the coil wire 29c that is inserted into the through-hole 92h of the first coil guide portion 92 toward the opening of the through-hole 92h. The second coil guide portion 93 has an inclined surface 93a and an enclosing rib 93r. In other words, at least a portion of the second coil guide portion 93 is the inclined surface 93a.

As shown in FIG. 4, the inclined surface 93a is generally teardrop-shaped when viewed in the axial direction and extends circumferentially. The opening of the through hole 92h opens at one circumferential end of the inclined surface 93a. As a result, the second coil guide portion 93 opens into the first coil guide portion 92. In other words, 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 second coil guide portions 93 of the three pairs of second coil guide portions 93 is arranged adjacent to each other when viewed in the axial direction.

The opening of the first coil guide portion 92 is located at the end of one or the other circumferential side of the second coil guide portion 93. In each pair of second coil guide portions 93, the opening of the first coil guide portion 92 is located at the end of the adjacent second coil guide portion 93. In each of the three pairs of second coil guide portions 93, the second coil guide portion 93A located on one circumferential side and the second coil guide portion 93B located on the other circumferential side are located so that the openings of the first coil guide portion 92 are adjacent to each other. In other words, the opening of the second coil guide portion 93A is located at the end of the inclined surface 93a of the second coil guide portion 93A on the other circumferential side. The opening of the second coil guide portion 93B is located at the end of the inclined surface 93a of the second coil guide portion 93B on the one circumferential side.

The width d of the inclined surface 93a as viewed in the axial direction narrows circumferentially toward the opening of the first coil guide portion 92. The inclined surface 93a inclines toward one axial side (upward) as it approaches the opening of the first coil guide portion 92. As shown in FIG. 5 , the inclined surface 93a inclines more steeply 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. In a cross-sectional view along the axial direction, the inclined surface 93a curves in an arc shape in the circumferential direction from the position farthest from the opening toward the opening.
The inclined surface 93 a may be inclined upward in the radial direction toward the opening of the first coil guide portion 92 .

As shown in Figures 3 and 4, the surrounding rib 93r is arranged to surround the inclined surface 93a of the second coil guide portion 93 when viewed in the axial direction. The surrounding rib 93r is cylindrical and protrudes downward (to the other axial side) from the lower surface 91a of the coil guide main 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 arranged continuously in the circumferential direction.

The coil guide 90 has an insertion tube portion (insertion portion) 97, a protrusion portion 98, a circumferential rib 95a, and a radial rib 96a. The insertion tube portion 97, the protrusion portion 98, the circumferential rib 95a, and the radial rib 96a are provided on the underside 91a of the coil guide main body 91.

The insertion tube portion 97 extends continuously circumferentially from one circumferential end of the three pairs of surrounding ribs 93r and is connected to the other circumferential end of the three pairs of surrounding ribs 93r. By providing the three pairs of surrounding ribs 93r on a portion of the circumference, the insertion tube portion 97 is continuous around the entire circumference. The insertion tube portion 97 protrudes downward from the lower surface 91a. The insertion tube portion 97 is positioned inside the tubular portion 44c at the upper end of the housing main body 41. In other words, the insertion tube portion 97 is inserted into the tubular portion 44c.

The protrusions 98 are provided on the outer peripheral surface of the insertion tube portion 97. The protrusions 98 are provided at intervals around the circumferential direction of the insertion tube portion 97. Each protrusion 98 protrudes radially outward from the outer peripheral surface of the insertion tube portion 97 and extends along the axial direction. Each protrusion 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 tubular portion 44c. The tapered portion 98a is provided contiguous to the lower side of the tip surface 98b. The tapered portion 98a is provided at the end of the lower side (the other axial side) of the protrusion 98. The height of the tapered portion 98a protruding radially outward from the insertion tube portion 97 gradually decreases downward (toward the other axial end). The provision of such a tapered portion 98a allows the insertion tube portion 97 of the coil guide 90 to be easily inserted into the inside of the cylindrical portion 44c. The tip surface 98b of the protrusion portion 98 abuts against the inner peripheral surface of the cylindrical portion 44c, thereby attaching the coil guide 90 to the housing main body 41.
In the present embodiment, the protrusions 98 are provided on the outer peripheral surface of the cylindrical insertion tube portion 97. However, the protrusions do not have to be cylindrical as long as they are part (insertion portion) of the coil guide 90 that is inserted into the cylindrical portion 44c.

The circumferential rib 95a is provided radially inward relative to the insertion cylindrical portion 97. The circumferential rib 95a has an annular shape when viewed in 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 main body 91. The plurality of radial ribs 96a extend radially from the center of the lower surface 91a. Each radial rib 96a extends in the radial direction. The radial ribs 96a, the circumferential rib 95a, and the insertion tube portion 97 are connected to one another.
The insertion tube portion 97, the protruding strip portion 98, the circumferential rib 95a, and the radial rib 96a have the same downward protrusion dimension from the lower surface 91a as the surrounding rib 93r.

As shown in Figures 5 and 6, the potting region 94 is provided on the lower surface 91a or upper surface 91b of the coil guide main body 91. In this embodiment, the potting region 94 is provided on the upper surface 91b of the coil guide main body 91. The through holes 92h of the first coil guide portion (coil guide portion) 92 open into the potting region 94. The coil guide 90 has three potting regions 94. The three potting regions 94 are provided circumferentially spaced apart on the outer periphery of the coil guide main body 91. The three potting regions 94 are positioned on either side of the coil guide main body 91, corresponding to the three pairs of first coil guide portions 92. A pair of first coil guide portions 92 open into one potting region 94. Each potting region 94 has, for example, an oval shape extending circumferentially when viewed in the axial direction. A peripheral wall 94r that protrudes upward from the upper surface 91b of the coil guide body 91 is provided on the outer periphery of each potting region 94. The potting region 94 is filled with potting material 99.

A circumferential rib 95b and a radial rib 96b are provided on the upper surface 91b of the coil guide main body 91. The circumferential rib 95b is annular when viewed axially and extends circumferentially. In this embodiment, the circumferential rib 95b is provided in duplicate in the radial direction with different diameters. Multiple radial ribs 96b are provided circumferentially spaced apart on the upper surface 91b of the coil guide main body 91. The multiple radial ribs 96b extend radially from the center of the upper surface 91b. Each radial rib 96b extends radially. The radial ribs 96b and the circumferential rib 95b are connected to each other.

1, the coil wires 29c of the U-phase, V-phase, and W-phase coils 29 are inserted from below into the through-holes 92h of the three pairs of first coil guide portions 92 and protrude above the coil guide main body 91. Each coil wire 29c is inserted into a through-hole provided in a circuit board 50 disposed above the coil guide main body 91 and is electrically connected to a circuit on the circuit board 50.
At the portion where the coil wire 29c passes through the through-hole 92h, the potting region 94 is filled with a potting material 99, thereby sealing the gap between the through-hole 92h and the coil wire 29c.

In this embodiment, the end 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 of the coil wire 29c connected to the circuit board 50. The coil 29, which is immersed in the oil in the motor accommodating recess 44a, becomes approximately the same temperature as the oil over time. This temperature is propagated through the coil 29. As a result, the temperature of the oil in the housing 40 can be detected by detecting the temperature of the coil wire 29c with the temperature sensor 59.

According to this embodiment, the coil guide 90 disposed between the motor 20 and the circuit board 50 has a first coil guide portion 92 that axially penetrates a coil guide main body 91 and holds the coil wire 29c. This allows the coil wire 29c to be held and directly connected to the circuit board 50 without using a bus bar or connection terminal. This prevents the pump 10 from becoming too large in the axial direction, allowing the pump 10 to be made more compact.
Furthermore, a potting material 99 is filled into a potting region 94 where the first coil guide portion 92 opens. As a result, the coil guide 90 not only holds the coil wire 29c, but also seals the coil wire 29c in the first coil guide portion 92. This eliminates the need to provide bus bars, connection terminals, and sealing members. This reduces the number of parts in the pump 10, thereby enabling cost reduction, size reduction, and improved assembly.

In this embodiment, the first coil guide portion 92 is a through hole 92h, so by passing the coil wire 29c through the through hole 92h, the coil wire 29c can be securely held in the axial direction.

In this embodiment, the hole diameter of the first coil guide portion 92 is 1.5 times or less the wire diameter of the coil wire 29c. This keeps the gap between the first coil guide portion 92 and the coil wire 29c small, ensuring that the coil wire 29c is securely held in the first coil guide portion 92. Furthermore, when potting material 99 is filled to fill the gap between the first coil guide portion 92 and the coil wire 29c, leakage of the potting material 99 from the gap between the first coil guide portion 92 and the coil wire 29c can be prevented.

In this embodiment, a pair of first coil guide portions 92 are open in one potting area 94, allowing coil wires 29c of the same phase to be potted together, improving workability.

In this embodiment, the coil guide 90 has an insertion tube portion 97 that is positioned inside the cylindrical portion 44c of the housing 40, and a protrusion portion 98 that is provided on the outer peripheral surface of the insertion tube portion 97. This makes it easy to position the coil guide 90 radially when fixing the coil guide 90 to the housing 40.

In this embodiment, the protrusion 98 is provided with a tapered portion 98a, making it easy to insert the coil guide 90 into the housing 40.

In this embodiment, the strength of the coil guide 90 can be increased by providing circumferential ribs 95a and radial ribs 96a.

According to this embodiment, a temperature sensor 59 is provided that measures the temperature of the end of the coil wire 29c connected to the circuit board 50. This eliminates the need to install the temperature sensor 59 inside the motor housing recess 44a, and also eliminates the need to reserve space for the temperature sensor 59. This helps prevent the pump 10 from becoming larger. Furthermore, if the temperature sensor 59 were located inside the motor housing recess 44a, a seal would be required where the lead wire from the temperature sensor 59 passes through the coil guide 90; however, by connecting the temperature sensor 59 to the circuit board 50, this seal is no longer necessary.

According to this embodiment, the first coil guide portion 92 has an inclined surface 93a that slopes toward one side in the axial direction as it approaches the opening. This allows the coil wire 29c drawn out from the stator portion 26 to be easily guided along the inclined surface 93a into the opening. Furthermore, because the width d of the second coil guide portion 93 narrows as it approaches the opening of the first coil guide portion 92, the coil wire 29c can be easily guided into the opening by placing the coil wire 29c against the wider portion of the second coil guide portion 93 with the wider width d. Therefore, the coil wire 29c can be inserted into the opening and easily and securely held.

In this embodiment, the opening of the first coil guide portion 92 is located at one or the other circumferential end of the second coil guide portion 93. This prevents the coil guide 90 from becoming too large in the radial direction.

In this embodiment, the pair of second coil guide portions 93 are arranged adjacent to each other when viewed in the axial direction, and in each second coil guide portion 93, the opening of the first coil guide portion 92 is arranged at the end of the adjacent second coil guide portion 93. This allows the coil guide 90 to hold a pair of coil wires 29c of the same phase close together. Because the pair of coil wires 29c of the same phase can be connected to the circuit board 50 close together, the process of connecting the coil wires 29c to the circuit board 50 is simplified.

According to this embodiment, the coil guide 90 has an enclosing rib 93r that surrounds the second coil guide portion 93. This reinforces the coil guide 90. The enclosing rib 93r also ensures the depth of the second coil guide portion 93, preventing the coil wire 29c from coming off the second coil guide portion 93. It also makes it easier to make the inclination of the inclined surface 93a steeper, making it easier to guide the coil wire 29c into the first coil guide portion 92.

In this embodiment, the inclined surface 93a slopes steeply as it approaches the first coil guide portion 92, making it easier to guide the coil wire 29c into the first coil guide portion 92.

In this embodiment, the inclined surface 93a is curved in an arc shape, making it easier to guide the coil wire 29c into the first coil guide portion 92.

The above describes one embodiment of the present invention and its variations. However, the individual configurations and combinations thereof in the embodiment and variations are merely examples, and additions, omissions, substitutions, and other modifications to the configurations are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the embodiment.

For example, the uses of the electric pumps of the above-described embodiments and their variations are not particularly limited.

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, 59...Temperature sensor, 90...Coil guide (sealing member), 91...Coil guide main body (sealing member main body), 91a...Lower surface (first surface), 91b...Upper surface (second surface), 92...First coil guide portion (coil guide portion), 92h...Through-hole, 94...Potting area, 95a...Circumferential rib, 96a...Radial rib, 97...Insertion cylindrical portion (insertion portion), 98...Protrusion portion, 98a...Tapered portion, 98b...Tip surface, 99...Potting material, J1...Center axis, S...Accommodation space

Claims (6)

a motor as a three-phase motor having a rotor portion and a stator portion 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 portion on the other axial side of the motor;
a housing having an accommodation space for accommodating the motor, the pump mechanism, and the circuit board;
a seal member that seals and partitions the accommodation space between the motor and the circuit board,
the stator portion has three pairs of coil wires for U-phase, V-phase, and W-phase that extend axially to one side and are connected to the circuit board;
The sealing member is
a first surface facing the motor and a second surface facing the circuit board;
a coil guide portion that passes through in the axial direction and guides the coil wire along the axial direction;
a potting region provided on the first surface or the second surface and into which the coil guide portion opens;
a potting material filled in the potting region ;
the seal member has three pairs of the coil guide portions and three of the potting regions;
A pair of the coil guide portions are open in one of the potting regions,
The pair of coil wires of the same phase are arranged in one of the potting regions,
The coil wires of different phases are arranged in different potting regions.
Yes, an electric pump. a motor having a rotor portion and a stator portion 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 portion on the other axial side of the motor;
a housing having an accommodation space for accommodating the motor, the pump mechanism, and the circuit board;
a seal member that seals and partitions the accommodation space between the motor and the circuit board,
the stator portion has a coil wire extending to one axial side and connected to the circuit board,
The sealing member is
a first surface facing the motor and a second surface facing the circuit board;
a coil guide portion that passes through in the axial direction and guides the coil wire along the axial direction;
a potting region provided on the first surface or the second surface and into which the coil guide portion opens;
a potting material filled in the potting region ;
the housing has a cylindrical portion surrounding the motor,
The sealing member is
an insertion portion to be inserted into the cylindrical portion;
a protrusion provided on an outer peripheral surface of the insertion portion and protruding radially outward and extending along the axial direction,
a radially outer tip surface of the protrusion portion contacts an inner circumferential surface of the cylindrical portion;
Electric pump. The coil guide portion is a through hole.
The electric pump according to claim 1 or 2 . The hole diameter of the coil guide portion is 1.5 times or less the wire diameter of the coil wire.
The electric pump according to claim 3 . a tapered portion having a protruding height decreasing toward the other axial side is provided at an end portion of the protruding portion on the other axial side;
The electric pump according to claim 2 . The sealing member is
a circumferential rib provided on the first surface and extending along a circumferential direction;
a radial rib provided on the first surface and extending along a radial direction,
The electric pump according to any one of claims 1 to 5 , wherein the circumferential rib and the radial rib are connected to each other.