WO2018051989A1

WO2018051989A1 - Motor

Info

Publication number: WO2018051989A1
Application number: PCT/JP2017/032925
Authority: WO
Inventors: 弘幸阿部; 俊輔村上; 剛央新子; 裕也齋藤; 慎吾福本
Original assignee: 日本電産株式会社
Priority date: 2016-09-16
Filing date: 2017-09-12
Publication date: 2018-03-22
Also published as: CN109792186B; JPWO2018051989A1; CN109792186A

Abstract

Provided is a motor including: a bus bar to which a conductive wire extending from a coil toward one side in the axial direction is connected; a bus bar holder held to the interior of a housing; and a cover part secured adjacent to one side of the bus bar holder in the axial direction in the interior of the housing. The bus bar holder is disposed on the one side in the axial direction from a stator, the outer peripheral surface of the bus bar holder being in contact with the inner peripheral surface of the housing. An annular end face recessed section that is recessed toward the other side in the axial direction is provided in a portion of the end face of the bus bar holder on the one side in the axial direction in contact with the cover part. A first member is fit into the end face recessed section.

Description

motor

The present invention relates to a motor.

A conventional motor is described in Patent Document 1, for example. The electric motor described in Patent Document 1 is an electric motor that rotates around a rotating shaft, and when one end side of the rotating shaft is used as an output shaft, a set screw is inserted into a through hole that overlaps the rotating shaft provided on the other end side. The environment resistance (prevention and antifouling properties) is improved by screwing. And in patent document 1, the penetration | invasion of water is suppressed by inserting | pinching an O-ring with a through-hole and a set screw.

International Publication No. 2014/068683

In the electric motor described in Patent Document 1, the through hole is formed at a position overlapping with the shaft portion, and it is possible to close the through hole. Is often provided. Therefore, in the structure of patent document 1, it is necessary to screw in a set screw for every through-hole, and an operation | work is complicated. Further, when the through hole provided in the electric motor is not a circle, it is difficult to screw the set screw.

Therefore, an object of the present invention is to provide a motor that can suppress water in the housing.

An exemplary motor of the present invention includes a cylindrical housing having an opening on one axial side and a stator fixed inward, and a conductor extending from the coil disposed on the stator toward one axial side. Connected to the bus bar, the bus bar holder holding the bus bar and held inside the housing, and a cover portion fixed inside the housing adjacent to one side in the axial direction of the bus bar holder. The bus bar holder is disposed on one axial side of the stator, and the outer peripheral surface of the bus bar holder is in contact with the inner peripheral surface of the housing and is in contact with the cover portion of the end surface on one axial side of the bus bar holder Is provided with an annular end surface recess recessed toward the other side in the axial direction, and a first member is fitted in the end surface recess.

According to the exemplary motor of the present invention, it is possible to suppress the ingress of liquid such as water into the housing.

FIG. 1 is a perspective view of a motor according to a first embodiment of the present invention. FIG. 2 is a plan view of the motor shown in FIG. 1 viewed in the axial direction. 3 is a cross-sectional view of the motor shown in FIG. 2 cut along a plane including the line III-III and the central axis. FIG. 4 is an enlarged cross-sectional view of the periphery of a bus bar holder of another example of the motor according to the first embodiment of the present invention. FIG. 5 is an enlarged cross-sectional view of the periphery of a bus bar holder of another example of the motor according to the first embodiment of the present invention. FIG. 6 is an enlarged cross-sectional view of the periphery of a bus bar holder of still another example of the motor according to the first embodiment of the present invention. FIG. 7: is sectional drawing cut | disconnected by the surface in alignment with the axis | shaft of the motor concerning 2nd Embodiment of this invention. FIG. 8 is an enlarged cross-sectional view of the periphery of a bus bar holder of another example of the motor according to the second embodiment of the present invention. FIG. 9 is an enlarged cross-sectional view of the periphery of a bus bar holder of another example of a motor according to the second embodiment of the present invention. It is a figure.

Hereinafter, a motor according to an exemplary embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure easy to understand, the actual structure may be different from the scale, number, or the like in each structure.

In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is a direction parallel to the axial direction of the central axis C1 shown in FIG. The Y-axis direction is a direction orthogonal to the Z-axis direction. The X-axis direction is a direction orthogonal to both the Y-axis direction and the Z-axis direction.

In addition, in the state shown in FIG. 1, the Z-axis is the upper side (+ Z side) and the lower side is the negative side (−Z side). The positive side (+ Z side) in the Z-axis direction is called “one side”, and the negative side (−Z side) in the Z-axis direction is called “the other side”. The one side and the other side are simply names used for explanation, and do not limit the actual positional relationship and direction. Unless otherwise specified, a direction parallel to the central axis C1 (Z-axis direction) is simply referred to as an “axial direction”, a radial direction centered on the central axis C1 is simply referred to as a “radial direction”, and the central axis C1 The direction along the arc centered on the axis, that is, the circumferential direction of the central axis C1 is simply referred to as “circumferential direction”.

<1. First Embodiment>
<1.1 Outline of motor configuration>
A schematic configuration of a motor according to a first exemplary embodiment of the present invention will be described. FIG. 1 is a perspective view of a motor according to a first embodiment of the present invention. FIG. 2 is a plan view of the motor shown in FIG. 1 viewed in the axial direction. 3 is a cross-sectional view of the motor shown in FIG. 2 cut along a plane including the line III-III and the central axis.

As shown in FIG. 3, the motor A according to this embodiment includes a rotor 1, a stator 2, a housing 3, a first bearing 41, a second bearing 42, a bearing holding portion 5, a bus bar 61, It has a bus bar holder 62 and a cover portion 7.

<1.2 Rotor>
The rotor 1 has a shaft 11, a rotor core 12, and a rotor magnet (not shown). The shaft 11 has a cylindrical shape extending in the axial direction (Z-axis direction). That is, the rotor includes a shaft 11 extending along the axial direction. Although details will be described later, the shaft 11 is rotatably supported by the housing 3 via the first bearing 41 and the second bearing 42.

The rotor core 12 is a laminated body in which a plurality of magnetic steel plates are laminated and fixed in the axial direction. The rotor core 12 is fixed to the shaft 11. The rotor core 12 surrounds the shaft 11 in the circumferential direction. The shaft 11 and the rotor core 12 have the same center axis. A plurality of rotor magnets are fixed to the rotor core 12 so as to be adjacent to the rotor core 12 in the circumferential direction. The rotor core 12 and the rotor magnet rotate together with the shaft 11.

As shown in FIG. 3, in the motor A, the other axial side of the shaft 11 extends outward of the housing 3 in the axial direction. And the to-be-rotated body rotated with the motor A is attached to the part of the outer side of the housing 3 on the other side of the shaft 11 in the axial direction. In addition, as a to-be-rotated body, a gearwheel, a pump, a fan, a compressor etc. can be mentioned, for example, It is not limited to these.

<1.3 Stator>
The stator 2 surrounds the outer side of the rotor 1 in the radial direction. The center axis of the stator 2 and the rotor 1 coincides. The stator 2 includes a stator core 21 and a coil 22. Stator 2 faces rotor 1 and includes a plurality of coils 22. The stator core 21 is a laminated body in which a plurality of magnetic steel plates are laminated and fixed in the axial direction. The stator core 21 has an annular yoke (not shown) and a plurality of teeth (not shown) extending radially inward from the yoke. At least teeth of the stator core 21 are covered with an insulator 23. The insulator 23 is made of an electrically insulating material such as synthetic resin, enamel or rubber.

The coil 22 is formed by winding a conducting wire around the outer periphery of the insulator 23 covering the outer surface of the stator core 21. The coil 22 has an end portion of the conducting wire 221 drawn out, and the end portion of the conducting wire 221 extends from the end portion on one side in the axial direction of the stator 2 to the one side in the axial direction. The conducting wire 221 is electrically connected to the bus bar 61 and is connected to an external power source via the bus bar 61. By supplying power to the coil 22, the stator 21 is excited. For example, the coil 22 of the motor A is divided into three phases (U, V, W). Each phase is supplied with a sinusoidal current with a phase shift. Therefore, the conducting wire 221 has a number that can supply current to each of the three phases. In this embodiment, there are two sets of three phases.

<1.4 Housing>
The housing 3 has a cylindrical shape having an opening 300 on one side in the axial direction. The housing 1 has an outer peripheral surface 301 and an inner peripheral surface 302. The housing 3 has a bottom portion 303 that closes the housing 3 on the other axial side. A rotor 1 and a stator 2 are arranged inside the housing 3. A stator 2 is fixed inside the housing 3.

The outer peripheral surface 301 is an outer surface of the housing 3 and has a cylindrical shape extending along the central axis C1. The inner peripheral surface 302 is an inner surface of the housing 3 and has a cylindrical shape extending along the central axis C1. The outer peripheral surface 301 and the inner peripheral surface 302 have a common central axis (central axis C1), that is, are arranged coaxially. The stator 2 is fixed inside the housing 3 by press-fitting the outer peripheral surface of the stator core 21 into the inner peripheral surface of the housing 3. The stator 2 is fixed inward of the housing, so that the inner peripheral surface 302 and the central axis (central axis C1) coincide.

In this embodiment, the stator core 21 is press-fitted inside the housing 3, but other fixing methods may be used. Examples of other fixing methods include shrink fitting. Moreover, it is not limited to these, The method which can fix the stator 2 to the inside of the housing 3 can be employ | adopted widely.

The bottom portion 303 is disposed in the vicinity of the end portion on one side in the axial direction of the housing 3. Since the motor A is configured to fix the second fixing portion 32 to an external device, the bottom portion 303 is formed as the same member as the inner peripheral surface 302, but is not limited thereto. For example, the bottom portion 303 may be formed as a separate member from the cylindrical portion of the housing 3 and fixed by a method such as press fitting or shrink fitting.

The bottom portion 303 has a plate shape extending inward from the inner peripheral surface 302. The central portion of the bottom portion 303 has a through hole 3031 that passes through the bottom portion 303 in the axial direction. A bearing fixing portion 304 extending from the portion surrounding the through hole 3031 of the bottom portion 303 in the radial direction to one side in the axial direction is provided. The bearing fixing portion 304 is cylindrical. The outer ring of the second bearing 42 is fixed to the inner peripheral surface of the bearing fixing portion 304. The inner peripheral surface of the bearing fixing portion 304 and the through hole 3031 coincide with the inner peripheral surface 302 of the housing 3 and the central axis. Moreover, it has the cylindrical protrusion part 305 extended in the axial direction other side from the part surrounding the through-hole 3031 of the bottom part 303 to radial direction. The protrusion 305 is used when the motor A is fixed to an external device. The through hole 3031 penetrates the center of the protrusion 305 in the axial direction.

<1.5 Bearing>
In the rotor 1, one axial side of the shaft 11 with respect to the rotor core 12 is rotatably supported by the first bearing 41 and the other side is rotatably supported by the second bearing 42. That is, the rotor 1 is rotatably supported by the first bearing 41 and the second bearing 42.

The first bearing 41 is, for example, a rolling bearing. In the present embodiment, the first bearing 41 is a ball bearing and has an outer ring, an inner ring, and a ball. The outer ring and the inner ring are arranged coaxially, and a plurality of balls are arranged in the circumferential direction at a portion between the outer ring and the inner ring. The first bearing 41 may be an oil-impregnated bearing. The 1st bearing 41 may be the structure using the roller which is a column-shaped rotary body instead of a ball | bowl. The first bearing 41 has an outer ring fixed to a bearing fixing portion 53 described later of the bearing holding portion 5. That is, the first bearing 41 is held inside the housing 3 via the bearing holding portion 5.

The second bearing 42 is fixed to the bearing fixing portion 304 of the housing 3. The outer ring of the second bearing 42 is fixed to the inner peripheral surface of the bearing fixing portion 304. The shaft 11 is fixed to the inner ring. As a result, the shaft 11 is coaxial with the inner peripheral surface 302 of the housing 3 (here, the central axis C1).

The second bearing 42 is a so-called ball bearing having the same configuration as the first bearing 41. The second bearing 42 has an outer ring, an inner ring, and a ball. The second bearing 42 may be an oil-impregnated bearing. The 2nd bearing 42 may be the composition using the roller which is a column-shaped rotating body instead of a ball.

A bearing elastic member 43 is disposed in the gap between the first bearing 41 and the bearing fixing portion 53. The bearing elastic member 43 is an annular member. The bearing elastic member 43 is a so-called wave washer having a wave shape along the circumferential direction. In addition, the bearing elastic member 43 is not limited to a wave washer, For example, a coil spring, a disc spring, etc. may be sufficient. The bearing elastic member 43 is not limited to an annular shape. For example, an irregular elastic body such as rubber or an elastic body using a fluid such as air or oil may be used.

The bearing elastic member 43 is in contact with the first bearing 41 and the bearing fixing portion 53 while being elastically deformed in the axial direction in advance. That is, the bearing elastic member 43 is disposed between the first bearing 41 and the bearing fixing portion 53. The bearing elastic member 43 pushes the outer ring of the first bearing 41 and the bearing fixing portion 53 with a force of returning to the original state. Thereby, rattling due to the gap between the outer ring and the ball of the first bearing 41 and rattling due to the gap between the ball and the inner ring can be suppressed. By suppressing the rattling of the first bearing 41, the rotation of the first bearing 41 is stabilized, and the life of the first bearing 41 can be extended. Further, by suppressing the rattling of the first bearing 41, it is possible to suppress vibration and vibration of the shaft 11 when the motor A is driven. A bearing elastic portion may also be provided on the second bearing 42 side. Further, when the bearing rattling or the shaft 11 has little or no runout, the bearing elastic member 43 may be omitted.

<1.6 Bearing holder>
The bearing holding portion 5 is located on one side in the axial direction of the stator 2. The bearing holding part 5 is made of metal, for example. The bearing holding part 5 is fixed inside the housing 3 by press fitting.

The bearing holding part 5 has a shaft through hole 50, an annular part 51, a cylindrical part 52, and a bearing fixing part 53. In the bearing holding portion 5, the annular portion 51 has an annular shape extending inward from the inner peripheral surface of the cylindrical portion 52. The shaft through hole 50 penetrates the center portion of the annular portion 51 in the axial direction. The bearing fixing portion 53 has a cylindrical shape that surrounds the shaft through hole 50 and extends to the other side in the axial direction. The outer ring of the first bearing 41 is fixed to the inner peripheral surface of the bearing fixing portion 53.

The bearing holding portion 5 is fixed to the housing 3 by press-fitting the outer peripheral surface of the cylindrical portion 52 into the inner peripheral surface 302 of the housing 3. In addition, the method of fixing the bearing holding portion 5 is not limited to press-fitting, and examples thereof include a method that can be firmly fixed, such as shrink fitting.

The shaft through hole 50, the outer peripheral surface of the cylindrical portion 52, and the bearing fixing portion 53 are coaxial. Therefore, by fixing the bearing holding portion 5 holding the first bearing 41 to the inner peripheral surface 302 of the housing 3, the central axis of the inner peripheral surface 302 and the first bearing 41 is different from the central axis C 1 of the housing 3. Overlap. The shaft 11 is fixed to the inner ring of the first bearing 41 by press-fitting.

The annular part 51 of the bearing holding part 5 has a plurality of conductor through-holes 510 through which the conductor 221 penetrates in the axial direction. A plurality of conducting wires 221 may penetrate one conducting wire through-hole 510, or a plurality of conducting wires 221 may penetrate each of the plurality of conducting wire through-holes 510. In the bearing holding portion 5 of the present embodiment, a plurality of conductors 221 (for example, U line, V line, W line) penetrate the same conductor through hole 510.

When the end of the housing 3 on the other side in the axial direction has an opening, the bearing holding portion 5 is attached to the opening on the other side in the axial direction instead of the bottom.

<1.7 bus bar and bus bar holder>
In the motor A, power is supplied to the coil 22 from an external power source via the bus bar 61. The bus bar 61 is held by the bus bar holder 62. The bus bar holder 62 holds the bus bar 61 and is disposed inside the housing 3. The end face 627 on the other axial side of the bus bar holder 62 is in contact with one axial side of the bearing holder 5. That is, the bus bar holder 62 is located on one axial side of the rotor 1, the stator 2 and the bearing holding portion 5.

<1.7.1 Bus bar holder>
The bus bar holder 62 has a bottomed cylindrical shape. The bus bar holder 62 is, for example, a resin molded body. The bus bar holder 62 has an outer peripheral surface 621 and an inner peripheral surface 622. The outer peripheral surface 621 and the inner peripheral surface 622 are both cylindrical surfaces, and the central axes (central axes C1) coincide with each other.

The bus barboulder 62 has a bottom flange 620 that extends radially inward from the other axial end of the inner peripheral surface 622. The bottom flange 620 includes a central through hole 6201 and a plurality of conducting wire through holes 6202. The central through hole 6201 is a hole that penetrates the central portion of the bottom flange 620 in the axial direction. When the bus bar holder 62 is attached to the housing 3, the shaft 21 passes through the central through hole 6201. The lead wire through-hole 6202 is a hole through which the lead wire 221 passes. The conducting wire through-hole 6202 is a position overlapping the conducting wire through-hole 510 of the bearing holding portion 5 in the axial direction. The conducting wire 221 passes through the conducting wire through hole 510 and the conducting wire through hole 6202.

As shown in FIG. 3, in the bus bar holder 62, the end surface 627 on the other side in the axial direction of the bottom flange 620 is in contact with the surface on one side in the axial direction of the bearing holding portion 5. The screw Sc passes through the bottom flange 620. The screw Sc fixes the bus bar holder 62 to the bearing fixing portion 5. In the present embodiment, the bottom flange 620 is fixed with the screw Sc, but is not limited thereto. It is possible to widely employ a method that can securely fix the bottom flange 620 to the bearing holding portion 5. Further, the outer peripheral surface 621 of the bus bar holder 62 is at least partially in contact with the inner peripheral surface 302 of the housing 3. Note that a gap may be formed between the outer peripheral surface 621 of the bus bar holder 62 and the inner peripheral surface 302 of the housing 3 except for a part thereof.

As shown in FIG. 3, the bus bar holder 62 has an annular first recess 623 that is recessed from the outer peripheral surface 621 toward the inside in the radial direction. Then, the first seal member 81 is fitted into the first recess 623. Details of the first recess 623 and the first seal member 81 will be described later.

<1.7.2 Bus bar>
The bus bar 61 is made of a conductive material, for example, a metal. The bus bar 61 includes a main body (not shown) held by the bus bar holder 62, a conductor connection terminal 611 exposed inside the inner peripheral surface 622 of the bus bar holder 62, and an external connection terminal (not shown) connected to an external power source. Have The main body portion of the bus bar 61 is electrically connected to the conductor connection terminal 611 and the external connection terminal.

The conducting wire connection terminal 611 protrudes from the inner peripheral surface 622 of the bus bar holder 62. And while having extended in the axial direction one side, the terminal of the axial direction one side has the folding | returning part turned back in the circumferential direction. By sandwiching the conducting wire 221 at the folded portion, the conducting wire 221 and the conducting wire connection terminal 611 are electrically connected. In addition, the above-mentioned method may be used for the connection between the conducting wire connection terminal 611 and the conducting wire 221, or another method may be used. For example, adhesion using an adhesive having conductivity, soldering, welding, and the like can be given.

<1.8 Cover part>
The cover part 7 is formed of a material having water resistance. In the present embodiment, the cover portion 7 is made of resin. The cover portion 7 may be the same resin as the bus bar holder 2 or a different resin. Moreover, when it has water resistance (corrosion resistance), you may form with materials other than resin. The cover portion 7 covers an end portion on one axial side of the shaft 11. And the cover part 7 is adjacent to the axial direction one side (end surface 628) of the bus bar holder 62. As shown in FIG.

The cover part 7 includes a first cylinder part 71, a second cylinder part 72, a flange part 73, and a connection plate part 74. The first tube portion 71 has an opening on the other side in the axial direction. The second cylindrical portion 72 has an outer diameter smaller than that of the first cylindrical portion 71, is closed on one side in the axial direction, and has an opening on the other side in the axial direction. The connecting plate portion 74 has an annular shape that connects the end portion on the one axial side of the first cylindrical portion 71 and the end portion on the other axial side of the second cylindrical portion 72. That is, since the 1st cylinder part 71 and the 2nd cylinder part 72 are connected via the connection board part 74, the inside of the 1st cylinder part 71 and the 2nd cylinder part 72 is watertight.

And inside the 1st cylinder part 71, conducting wire connecting terminal 611 and conducting wire 221 are arranged. At least a part of the end portion on one side in the axial direction of the shaft 11 is disposed in the second cylindrical portion 72. By setting it as such a structure, it is possible to widen the space of the edge part of the axial direction one side of the housing 3. FIG. Further, since the first tube portion 71 and the second tube portion 72 have different diameters, the strength of the cover portion 7 can be increased.

The cover part 7 is in contact with the bus bar holder 62 via the flange part 73. The flange portion 73 has an annular shape extending from the end on the other axial side of the first cylindrical portion 71 toward the radially outer side. That is, the flange portion 73 located at the end portion on the other axial side of the cover portion 7 is in contact with the end surface 628 on the one axial direction side of the bus bar holder 62. The flange portion 73 is fixed to the end surface 628. Thereby, each through-hole of the bearing holding part 5 and the bus bar holder 62 is water-tightly covered by the cover part 7. In addition, although fixation with the flange part 73 and the bus bar holder 62 can mention welding, adhesion | attachment, fixation by a sealing agent, etc., for example, it is not limited to this. A method that can fix the space between the flange portion 73 and the bus bar holder 62 in a watertight manner can be widely employed.

<1.9 First Seal Member>
The first seal member 81 is fitted into the first recess 623. The first seal member 81 is annular, and is made of an elastic material such as rubber or silicon rubber, for example. The first seal member 81 may include a rubber O-ring, but is not limited thereto. As the first seal member 81, for example, a water-tight and elastically deformable material such as an adhesive, a caulking material, and a resin ring can be widely used. That is, the first seal member 81 is an annular elastic member.

When the first seal member 81 is fitted into the first recess 623, the first seal member 81 is elastically deformed and comes into close contact with the three inner surfaces of the first recess 623. At this time, a part of the first seal member 81 projects radially outward from the outer peripheral surface 621 of the bus bar holder 62.

As shown in FIG. 3, when the bus bar holder 62 is disposed inside the housing 3, the first seal member 81 is in a region surrounded by the three inner surfaces of the first recess 623 and the inner peripheral surface 302 of the housing 3. Arranged. The first seal member 81 is in close contact with the three inner surfaces of the first recess 623 and the inner peripheral surface 302 of the housing 3. Intrusion of water from the gap between the inner peripheral surface 302 of the housing 3 and the outer surface 623 of the bus bar holder 62 can be suppressed.

The first seal member 81 is pressed against the housing 3 by the elastic force applied from the inner surface of the first recess 623 toward the radially outer side. Thereby, the bus bar holder 62 does not require strength for pressing the first seal member 81 in the axial direction. Further, since the bus bar holder 62 does not have to be pressed against the bearing holding portion 5, fixing is easy. Further, the first seal member 81 is temporarily expanded and then fitted into the first recess 623. As a result, the first seal member 81 is fitted into the first recess 623 with an elastic force, and thus is difficult to drop off from the bus bar holder 62. Thereby, the attachment work of the 1st seal member 81 becomes easy.

<1.10 Modification 1 of First Embodiment>
A modification of the motor according to the first exemplary embodiment of the present invention will be described with reference to the drawings. FIG. 4 is an enlarged cross-sectional view of the periphery of a bus bar holder of another example of the motor according to the first embodiment of the present invention. The motor A1 shown in FIG. 4 is different from the motor A shown in FIG. Other parts have substantially the same configuration. Therefore, in the motor A1, substantially the same parts as those of the motor A are denoted by the same reference numerals, and detailed description of the same parts is omitted.

As shown in FIG. 4, in the motor A 1, the first recess 623 is provided at an end adjacent to the bearing holding portion 6 of the bus bar holder 62 (facing the end surface 627). In the motor A1, the first concave portion 623 has an opening on the outer side in the radial direction, and also has an opening on the end surface 627 on the bearing holding portion 5 side that is the other side in the axial direction. That is, the 1st recessed part 623 has two surfaces, the surface of the axial direction one side, and the surface of radial direction inner side. The first seal member 81 is fitted in the first recess 623.

The first seal member 81 is in close contact with the two surfaces of the first recess 623, the inner peripheral surface 302 of the housing 3, and the surface on one axial side of the bearing holding portion 5. Thereby, in the motor A, the infiltration of water from between the inner peripheral surface 302 of the housing 3 and the outer peripheral surface 621 of the bus bar holder 62 can be suppressed. Furthermore, the intrusion of water from between the end surface 627 on the other axial side of the bus bar holder 62 and the bearing holding portion 5 can be suppressed.

<1.10 Modification 2 of First Embodiment>
A modification of the motor according to the first exemplary embodiment of the present invention will be described with reference to the drawings. FIG. 5 is an enlarged cross-sectional view of the periphery of a bus bar holder of another example of the motor according to the first embodiment of the present invention. The motor A 2 shown in FIG. 5 further has a second recess 624 on the outer peripheral surface 621 of the bus bar holder 62, and the second seal member 82 is fitted in the second recess 624. Other than that, it is the same structure as the motor A shown in FIG. Therefore, in the motor A2, substantially the same parts as the motor A are denoted by the same reference numerals, and detailed description of the same parts is omitted.

As shown in FIG. 5, in the motor A 2, the outer peripheral surface 621 of the bus bar holder 62 has a second recess 624 located on one side in the axial direction from the first recess 623. In other words, the second recess 624 is an annular shape that is located on the outer circumferential surface 621 of the bus bar holder 62 on the one side in the axial direction with respect to the first recess 623 and is recessed radially inward. Similar to the first recess 623, the second recess 624 is an annular recess that is recessed in the radial direction of the bus bar holder 62 and extends in the circumferential direction. In addition, the 2nd recessed part 624 may be the same shape as the 1st recessed part 623, and a different shape may be sufficient as it.

Then, the second seal member 82 is fitted into the second recess 624. The second seal member 82 is an annular elastic member. The second seal member 82 has substantially the same configuration as the first seal member 81. The second seal member 82 may be a rubber O-ring, but is not limited thereto. The second seal member 82 has a shape that matches the shape of the second recess 624. When the second recess 624 has the same shape as the first recess 623, the second seal member 82 is also the first seal member. The shape can be the same as 81. The second seal member 82 may have a shape different from that of the first seal member 81. Furthermore, the first recess 623 and the second recess 624 have different shapes (for example, different axial length and radial length), and the first seal member 81 and the second seal member 82 are the same. It is good also as a shape.

In the motor A2 in this modification, the bus bar holder 62 has the first seal member 81 and the second seal member 82 in the axial direction on the outer peripheral surface 621. Between the inner peripheral surface 302 of the housing 3 and the outer peripheral surface 621 of the bus bar holder 62, a first seal member 81 and a second seal member 82 are arranged in series in the axial direction. Thereby, compared with the case where only the first seal member 81 is provided, the effect of suppressing the entry of water from between the inner peripheral surface 302 of the housing 3 and the outer peripheral surface 621 of the bus bar holder 62 is high.

<1.11 Modification 3 of First Embodiment>
A modification of the motor according to the first exemplary embodiment of the present invention will be described with reference to the drawings. FIG. 6 is an enlarged cross-sectional view of the periphery of a bus bar holder of still another example of the motor according to the first embodiment of the present invention. The motor A3 shown in FIG. 6 has two recesses, that is, a first recess 623 and a second recess 624, similar to the motor A2 shown in FIG. Moreover, the 1st recessed part 623 is provided in the edge part of the axial direction other side of the bus bar holder 62 similarly to motor A1 shown in FIG.

6, the outer peripheral surface of the flange portion 73 of the cover portion 7 is in contact with the inner peripheral surface 302 of the housing 3. And the 2nd recessed part 624 is provided in the edge part (end surface 628) adjacent to the cover part 7 of the bus bar holder 62. FIG. In the motor A3, the second recess 624 has an opening on the outer side in the radial direction, and also has an opening on the end surface 628 on the cover part 7 side that is one side in the axial direction. That is, the second recess 624 has two surfaces, the surface on the other side in the axial direction and the surface on the radially inner side. The second seal member 82 is fitted into the second recess 624.

The second seal member 82 is in close contact with the two surfaces of the second recess 624, the inner peripheral surface 302 of the housing 3, and the surface on the other axial side of the flange portion 73 of the cover portion 7. As a result, in the motor A 3, the intrusion of water from between the inner peripheral surface 302 of the housing 3 and the outer peripheral surface 621 of the bus bar holder 62 can be suppressed. Furthermore, the intrusion of water from between the end surface 628 on one side in the axial direction of the bus bar holder 62 and the cover portion 7 can be suppressed.

<2. Second Embodiment>
A motor according to a second exemplary embodiment of the present invention will be described with reference to the drawings. FIG. 7: is sectional drawing cut | disconnected by the surface along the axis | shaft of an example of the motor concerning 2nd Embodiment of this invention. In the motor B shown in FIG. 7, the bus bar holder 62 b has the end surface recess 625 and the first member 83 is fitted in the end surface recess 625. Other than that, it is the same structure as the motor A of 1st Embodiment. Therefore, in the motor B of the second embodiment, substantially the same parts as those of the motor A of the first embodiment are denoted by the same reference numerals and detailed description of the same parts is omitted.

<2.1 Cover part>
As shown in FIG. 4, the flange portion 73 of the cover portion 7 contacts the end surface 628 on one side in the axial direction of the bus bar holder 62 b inside the housing 3. That is, the cover portion 7 is fixed inside the housing 3 adjacent to one side in the axial direction of the bus bar holder 62b.

In addition, fixation with the flange part 73 and the end surface 628 of the axial direction one side of the bus bar holder 62 is performed by welding here. However, the method is not limited thereto, and examples thereof include adhesion and a fixing method using a sealing material. A method that can fix the flange portion 73 to the end surface 628 on one axial side of the bus bar holder 62b can be widely adopted.

<2.2 Bus bar holder>
The bus bar holder 62 b is held inside the housing 3. That is, the outer peripheral surface 621 of the bus bar holder 62 b is fixed in contact with the inner peripheral surface 302 of the housing 3. The outer peripheral surface 621 of the bus bar holder 62b and the inner peripheral surface 302 of the housing 3 are in contact with each other. Thereby, the infiltration of water from between the outer peripheral surface 621 of the bus bar holder 62b and the inner peripheral surface 302 of the housing 3 is suppressed.

The portion of the end surface 628 of the bus bar holder 62b that comes into contact with the flange portion 73 has an annular end surface recess 625 that is recessed toward the other side in the axial direction. That is, an annular end surface recess 625 that is recessed toward the other side in the axial direction is provided in a portion of the end surface 628 on one side in the axial direction of the bus bar holder 62b that comes into contact with the cover portion 7.

In the bus bar holder 62b, the end surface concave portion 625 is provided on the outer side in the radial direction than the central through hole 6201 and the plurality of conducting wire through holes 6202. That is, when the bus bar holder 62 b is viewed from one axial direction side, the central through hole 6201 and all the conductor through holes 6202 are arranged on the radially inner side with respect to the end surface recess 625.

<2.3 First member>
The first member 83 is fitted into the end surface recess 625 of the bus bar holder 62b. The first member 83 is annular, and here is a rubber O-ring. However, the 1st member 83 is not limited to this, For example, elastic materials, such as rubber | gum and silicon rubber, can be mentioned. As the first member 83, for example, a water-tight and elastically deformable material such as an adhesive, a caulking material, and a resin ring can be widely used. That is, the first member 81 is an annular elastic member.

When the first member 83 is fitted into the end surface recess 625, the first member 83 comes into close contact with the three inner surfaces of the end surface recess 625. At this time, the first member 83 has a cross-sectional shape in which a part of the first member 83 protrudes toward the one axial side from the end surface 628 of the bus bar holder 62b. The cover portion 7 is fixed to the end surface 628 of the bus bar holder 62b, and the first member 83 is in close contact with each of the three surfaces of the end surface recess 625 and the flange portion 73. Thereby, the infiltration of water from between the end surface 628 of the bus bar holder 62b and the flange portion 73 can be suppressed.

For example, if a convex portion is provided in the vicinity of the flange portion 73, it may be difficult to fix the entire outer periphery of the flange portion 73 to the end surface 628 of the bus bar holder 62b. Even in such a case, since the first member 83 that is in close contact with the three surfaces of the end surface recess 625 and the flange portion 73 is disposed, water tightness between the flange portion 73 and the end surface 628 is ensured. Thereby, the penetration | invasion of the water from between the flange part 73 and the bus bar holder 62b to the inside of the housing 3 can be suppressed.

<Modification 1 of Second Embodiment>
A modification of the motor according to the second exemplary embodiment of the present invention will be described with reference to the drawings. FIG. 8 is an enlarged cross-sectional view of the periphery of a bus bar holder of another example of the motor according to the second embodiment of the present invention. The motor B1 shown in FIG. 8 is different from the motor B shown in FIG. 7 in that the flange portion 73 of the cover portion 7b includes a convex portion 731. Other parts have substantially the same configuration. Therefore, in the motor B1, substantially the same parts as those of the motor B are denoted by the same reference numerals, and detailed description of the same parts is omitted.

As shown in FIG. 8, the cover portion 7 b is provided with a convex portion 731 protruding from the surface on the other axial side of the flange portion 73 to the other axial side. The convex portion 731 is provided at a position overlapping the end surface concave portion 625 disposed on the end surface 628 on one axial side of the bus bar holder 62b. And when the cover part 7b is fixed to the axial direction one side of the bus bar holder 62b, the convex part 731 is inserted in the end surface recessed part 625. FIG. That is, the cover portion 7b is provided with a convex portion 731 that overlaps the end surface concave portion 625 in the axial direction and protrudes to the other side in the axial direction. The convex portion 731 is inserted into the end surface concave portion 625. The convex portion 731 is annular when viewed from the other side in the axial direction. That is, the entire convex portion 731 is inserted into the end surface concave portion 625.

As shown in FIG. 8, the first member 83 is fitted in the end surface recess 625. The first member 83 is pushed to the other side in the axial direction by the convex portion 731 inside the end surface concave portion 625. Thus, when the first member 83 is pushed by the convex portion 731, the first member 83 is elastically deformed and closely contacts the three surfaces of the end surface concave portion 625 and the convex portion 731.

Therefore, by providing the cover portion 7b with the convex portion 731, even if the first member 83 is somewhat small, it is easily deformed by being pushed by the convex portion 731, so that it is easy to ensure water tightness. As the first member 83, it is possible to employ a gel-like sealing agent or the like. Since the convex portion 731 serves as a lid for the end surface concave portion 625, even if a gel sealant is used, the sealant hardly flows out to the outside, and the inside and the outside of the motor B1 are not easily contaminated.

In addition, in this modification, although the convex part 731 is cyclic | annular, it is not limited to this. For example, it is possible to fill the end surface recess 625 with an adhesive and use the adhesive as the first member 83, and to bond the cover portion 7b and the bus bar holder 62b. In this case, the convex portion 731 arranged intermittently is inserted into the end surface concave portion 625, and the adhesive filled in the end surface concave portion 625 is overflowed. Then, the bus bar holder 62b and the cover portion 7b may be bonded with an adhesive overflowing from the end surface recess 625. By pushing the first member 83 partially in the axial direction, it is possible to ensure sufficient water tightness that suppresses the intrusion of water into the motor B1. The convex part 731 can use the convex part provided intermittently in the position which overlaps with the end surface recessed part 625 in an axial direction.

In the present modification, the end surface recess 625 is provided with the first member 83 and the protrusion 731, but is not limited thereto. For example, the first member 83 may be omitted when the end surface recess 625 can be completely sealed with the protrusion 731. In this case, it can be said that the convex portion 731 is the first member.

<Modification 2 of Second Embodiment>
A modification of the motor according to the second exemplary embodiment of the present invention will be described with reference to the drawings. FIG. 9 is an enlarged cross-sectional view of the periphery of a bus bar holder of another example of a motor according to the second embodiment of the present invention. The motor B2 shown in FIG. 9 is provided with a circumferential recess 626 on the outer circumferential surface 621 of the bus bar holder 62b2. Then, the second member 84 is fitted inside the peripheral surface recess 626. This is different from the motor B shown in FIG. Other parts have substantially the same configuration. Therefore, in the motor B2, substantially the same parts as the motor B are denoted by the same reference numerals, and detailed description of the same parts is omitted.

As shown in FIG. 9, the outer peripheral surface 621 of the bus bar holder 62b2 is provided with a peripheral surface concave portion 626 that is recessed inward in the radial direction. The circumferential recess 626 is continuous in the circumferential direction of the outer circumferential surface 621. The second member 84 is fitted in the circumferential recess 626.

The second member 84 is annular, and here is a rubber O-ring. However, the 2nd member 84 is not limited to this, For example, elastic materials, such as rubber | gum and silicon rubber, may be sufficient. As the second member 84, for example, a material having water tightness and elastically deformable, such as an adhesive, a caulking material, and a resin ring, can be widely used. That is, the second member 84 is an annular elastic member.

The second member 84 is in close contact with the inner surface of the peripheral surface recess 626 and the inner peripheral surface 302 of the housing 3. Thereby, when there exists a clearance gap between the internal peripheral surface 302 of the housing 3, and the bus bar holder 62b2, the penetration | invasion of the water from the clearance gap can be suppressed.

As described above, in the motor B2, by having the end surface recess 625 and the first member 83, the intrusion of water from between the bus bar holder 62b2 and the cover portion 7 is suppressed. In addition, by having the peripheral surface recess 626 and the second member 84, the intrusion of water from the gap between the bus bar holder 62b2 and the housing 3 is suppressed.

In addition, the same structure as the 1st recessed part 623 of the bus bar holder 62 of the motor A of 1st Embodiment may be sufficient as the surrounding surface recessed part 626 provided in the bus bar holder 62b2. Similarly, the second member 84 may have the same configuration as the first seal member 81 of the motor A.

Although the embodiment of the present invention has been described above, the embodiment can be variously modified within the scope of the gist of the present invention.

The present invention can be used as a motor for driving an electric power steering. The present invention can also be used for power sources of various electric devices other than electric power steering.

A ... motor, A1 ... motor, A2 ... motor, A3 ... motor, B ... motor, B1 ... motor, B2 ... motor, 1 ... rotor, 11. ..Shaft, 12 ... rotor core, 2 ... stator, 21 ... stator core, 22 ... coil, 23 ... insulator, 3 ... housing, 300 ... opening, 301 ... Outer peripheral surface, 302 ... inner peripheral surface, 303 ... bottom, 3031 ... through hole, 304 ... bearing fixing part, 41 ... first bearing, 42 ... second bearing, 5. ..Bearing holding part, 50 ... shaft through hole, 51 ... annular part, 510 ... conductor through hole, 52 ... cylindrical part, 53 ... bearing fixing part, 61 ... bus bar 611 ... Conductor connection terminal, 62 ... Bus bar holder, 62b ... Bus bar holder 62b2: Bus bar holder, 620 ... Bottom flange, 6201 ... Central through hole, 6202 ... Conductor through hole, 621 ... Outer peripheral surface, 622 ... Inner peripheral surface, 623 ... No. 1 recess, 624 ... 2nd recess, 625 ... end face recess, 626 ... peripheral recess, 7 ... cover part, 7b ... cover part, 71 ... 1st cylinder part, 72 ... 2nd cylinder part, 73 ... Flange part, 731 ... Projection part, 74 ... Connection plate part

Claims

A cylindrical housing having an opening on one side in the axial direction and a stator fixed inward;
A bus bar to which a conductive wire extending toward one side in the axial direction is connected from a coil disposed in the stator;
A bus bar holder that holds the bus bar and is held inside the housing;
A cover portion fixed adjacent to one side in the axial direction of the bus bar holder inside the housing, and
The bus bar holder is
It is arranged on one side in the axial direction from the stator,
The outer peripheral surface of the bus bar holder is in contact with the inner peripheral surface of the housing,
A portion of the end face on one side in the axial direction of the bus bar holder that comes into contact with the cover part is provided with an annular end face recess that is recessed toward the other side in the axial direction.
A motor in which a first member is fitted in the end surface recess.
The cover portion has a convex portion that overlaps the end surface concave portion in the axial direction and projects to the other side in the axial direction,
The motor according to claim 1, wherein the convex portion is inserted into the end surface concave portion.
The motor according to claim 2, wherein the convex portion is annular.
The cover part is
A first tube portion having an opening on the other side in the axial direction;
A second cylinder part having an outer diameter smaller than that of the first cylinder part and having one axial side closed and an opening on the other axial side;
A connecting plate portion that connects an end portion on one axial side of the first cylindrical portion and an end portion on the other axial side of the second cylindrical portion;
The bus bar has a conductor connection terminal electrically connected to the conductor,
The said conducting wire connection terminal is distribute | arranged inside the said 1st cylinder part, At least one part of the edge part of the axial direction one side of the said shaft is distribute | arranged inside the said 2nd cylinder part. 4. The motor according to any one of 3.
The outer peripheral surface of the bus bar holder is provided with a peripheral surface recess recessed toward the radially inner side,
The circumferential recess is continuous in the circumferential direction of the outer circumferential surface,
The motor according to any one of claims 1 to 4, wherein a second member is fitted in the circumferential recess.
The motor according to claim 5, wherein the seal member is an annular elastic member.
The motor according to any one of claims 1 to 6, wherein the first member is an annular elastic member.