CN110323878B

CN110323878B - Electric motor

Info

Publication number: CN110323878B
Application number: CN201910231053.7A
Authority: CN
Inventors: 胜吕浩成; 大川高德; 小平修
Original assignee: Nidec Sankyo Corp
Current assignee: Nidec Instruments Corp
Priority date: 2018-03-30
Filing date: 2019-03-26
Publication date: 2021-06-25
Anticipated expiration: 2039-03-26
Also published as: JP7072427B2; JP2019180136A; CN110323878A

Abstract

A motor is provided, which can restrain resin from flowing into the inner side of a cover when the cover is covered by a resin sealing body. In the motor, a cover (60) closes an opening (111) of a motor housing (10) together with a terminal block (45). The resin inflow prevention protrusion (63) of the cover covers a portion of the terminal pin (80) located in the groove (456) of the terminal block (45) from a midway portion in the first direction (X) to a first end portion (81) side. The portions of the terminal pins exposed from the protruding portions are sealed by a sealing resin body (70) except for the vicinity of the second end portion (82). The protruding portion has a first plate portion (66) that covers the second end surface (450), and a plurality of second plate portions (67) that protrude from the first plate portion and fit into the respective grooves (456). Therefore, when the sealing resin body is formed by resin molding, the resin is not easily flowed into the side where the first end portion is located via the groove (456).

Description

Electric motor

Technical Field

The present invention relates to a motor including a cover that covers one end of a terminal pin held on a terminal block.

Background

As a motor in which the airtightness of a motor case covering a rotor and a stator is improved, the following structure is proposed: the resin molding is performed in a state where an opening of the motor case is closed by a terminal block holding a plurality of terminal pins and a cover covering the terminal pins, and a sealing resin body covering the terminal block, the cover, and a side surface of the motor case is provided (see patent document 1). In the motor described in patent document 1, the terminal pins are held in grooves formed in the terminal block, and the cover is provided so as to cover the entire portions of the terminal pins located in the grooves.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2008-113495

Disclosure of Invention

Technical problem to be solved by the invention

However, in the structure described in patent document 1, only the end portion for coil connection of the terminal pin is covered, and when the resin sealing body is molded, there is a problem that the resin may flow into the inside of the cover, and the coil wire is cut by the pressure at that time.

In view of the above problems, an object of the present invention is to provide a motor capable of suppressing inflow of resin into a cover when the cover is covered with a resin sealing body.

Technical scheme for solving technical problem

In order to solve the above-described problems, an aspect of the present invention provides a motor including: a rotor provided with a permanent magnet; a stator opposing the permanent magnet; a motor case that covers the rotor and the stator and has an end plate portion provided at one end in an axial direction; a terminal block disposed on the other side in the axial direction of the motor case, and having a plurality of grooves extending in a first direction formed in an end surface on the other side in the axial direction so as to be arranged in parallel in a second direction orthogonal to the axial direction and the first direction; a plurality of terminal pins held inside the respective grooves, one end of the first direction, i.e., a first end for coil wire connection and the other end, i.e., a second end for external connection, protruding from different first and second side surfaces of the terminal block, respectively; a cover that is disposed so as to cover the first end portion and that closes, together with the terminal block, an opening that is open on the other side of the motor case in the axial direction; and a sealing resin body provided so as to cover the terminal block and the cover from the other side in the axial direction, the sealing resin body covering a side surface of the motor case and including a wall surface from which the second end portion protrudes, the cover including a main body portion facing the first side surface and against which an opening edge of the motor case is brought into contact, and a protrusion portion protruding from the main body portion and covering the terminal block from the other side in the axial direction, the protrusion portion including a first plate portion overlapping the end surface and a plurality of second plate portions protruding from the first plate portion to the one side in the axial direction and fitted into respective interiors of the plurality of grooves.

In the present invention, the cover has a projection for preventing resin from flowing into the terminal block from the other side in the axial direction, and the projection has a first plate portion overlapping the end face of the terminal block and a plurality of second plate portions projecting from the first plate portion to the one side in the axial direction and fitted into the respective grooves. Therefore, when the sealing resin body is formed by resin molding, the resin is less likely to flow into the inside of the cover where the first end portion is located via the groove.

In the present invention, the following can be adopted: the cover has a first protruding portion that protrudes to one side in the axial direction at a position radially inward of a position of the body portion, the position being in contact with an end portion of the motor housing, and that comes into contact with an inner peripheral surface of the motor housing from the radially inward side. According to this aspect, the cover can be easily disposed so as to close the opening of the motor case.

In the present invention, the following can be adopted: the terminal block includes an arcuate step portion that comes into contact with the inner peripheral surface from a radially inner side, and the first convex portion comes into contact with the inner peripheral surface from the radially inner side in a state of being fitted into a circumferential cut portion of the step portion.

In the present invention, the following can be adopted: a recess is formed in a surface of the main body portion facing the terminal block, the recess having the first end portion located inside.

In the present invention, the following can be adopted: partition walls are provided in the concave portions, the partition walls partitioning between adjacent ones of the plurality of terminal pins in the second direction.

In the present invention, the following can be adopted: the cover has a second projection projecting from the main body at a position separated from the projection toward one side in the axial direction and covering a first receiving surface of the terminal block toward one side in the axial direction. According to this aspect, the cover can be positioned in the axial direction.

In the present invention, the following can be adopted: the second convex portions are formed at two locations separated in the second direction, and the terminal block includes second receiving surfaces against which the second convex portions are respectively brought into contact from opposite sides in the second direction. According to this aspect, the second convex portion can be used to position the cover in the circumferential direction with respect to the terminal block.

In the present invention, the following can be adopted: the plurality of terminal pins extend straight from portions held in the plurality of grooves to the first end portions, respectively, the surface of the second protruding portion on the other side in the axial direction includes an inclined surface that is inclined from the body portion to one side in the axial direction and extends toward the first receiving surface, and the surfaces of the second plate portions on one side in the axial direction include first surfaces that are inclined from the body portion to one side in the axial direction and extend into the grooves. In the case where the terminal pin extends linearly from the midway portion to the first end portion, it is necessary to set a structure in which the second plate portion protrudes in the axial direction from the first plate portion at a position overlapping with the terminal block so as to avoid the first end portion when the cover is attached, but in this case, a normal mold cannot be pulled out from between the first plate portion and the second protruding portion when the cover is molded. However, in the present invention, since the inclined surfaces are provided on the other surface in the axial direction of the second convex portion and the one surface in the axial direction of the second plate portion, the second plate portion can be pulled out from between the first plate portion and the second convex portion even with a normal mold, and therefore, an expensive mold is not required.

In the present invention, the following can be adopted: the first surface extends to a position farther from the main body than the inclined surface, and the surfaces on one side in the axial direction of the plurality of second plate portions each have a second surface that extends in a direction orthogonal to the axial direction, in a direction opposite to the main body, with respect to the first surface. According to this aspect, it is possible to more reliably suppress the resin from flowing into the side where the first end portion is located through the groove when the sealing resin body is formed by resin molding.

In the present invention, the following can be adopted: the first side surface is provided with a third projection for positioning that projects toward the cover, and the cover is provided with positioning portions that come into contact with the third projection from one side and the other side in the circumferential direction. According to this aspect, positioning of the cover in the circumferential direction can be easily performed.

(effect of the invention)

In the present invention, the cover has a projection for preventing resin from flowing into the terminal block from the other side in the axial direction, and the projection has a first plate portion overlapping the end face of the terminal block and a plurality of second plate portions projecting from the first plate portion to the one side in the axial direction and fitted into the respective grooves. Therefore, when the sealing resin body is formed by resin molding, the resin is less likely to flow into the side where the first end portion is located via the groove.

Drawings

Fig. 1 is a perspective view of a motor to which the present invention is applied.

Fig. 2 is an exploded perspective view of the motor shown in fig. 1.

Fig. 3 is a sectional view of the motor shown in fig. 1.

Fig. 4 is an explanatory view of the terminal block shown in fig. 2 and the like as viewed from the other side in the axial direction.

Fig. 5 is a cross-sectional view of the terminal block shown in fig. 4 and the like cut along the terminal pins.

Fig. 6 is a perspective view of the cap shown in fig. 2 attached to the first side surface of the terminal block.

Fig. 7 is a perspective view of the cover removed from the state shown in fig. 6.

Fig. 8 is a perspective view of the cover shown in fig. 2.

Fig. 9 is a side view of the cover shown in fig. 2.

Fig. 10 is an explanatory diagram of a modification 1 of the terminal pin used in the motor shown in fig. 1.

Fig. 11 is an explanatory diagram of a modification 2 of the terminal pin used in the motor shown in fig. 1.

Fig. 12 is an explanatory diagram of a modification 3 of the terminal pin used in the motor 1 shown in fig. 1.

Description of the reference numerals

1 … motor, 10 … motor housing, 11 … peripheral wall, 12 … end plate, 13 … flange, 20 … stator, 30 … rotor, 31 … rotating shaft, 32 … permanent magnet, 39 … output shaft, 40 … bobbin, 41 … synthetic resin, 45 … terminal block, 60 … cover, 61 … main body portion, 62 … first projection, 63 … projection, 64 … second projection, 66 … first plate portion, 67 … second plate portion, 68 … partition wall, 70 … sealing resin body, 71 … resin portion, 72 … cylinder portion, 73 … bottom portion, 76 … wall surface, 78 … connector housing, 80 … terminal pin, 81 … first end portion, 82 … second end portion, 88, 89 … crushing portion, 111 … opening portion, 120 … hole, 36450 end face, 451, … first side face 453, … second side face, … cover portion, 36454 terminal … holding groove, 36457 a, … receiving face, … receiving groove … b, 459 … third protrusion, 641 … inclined surface, 671 … first surface, 672 … second surface, X … first direction, Y … second direction

Detailed Description

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(integral Structure of Motor)

Fig. 1 is a perspective view of a motor 1 to which the present invention is applied. Fig. 2 is an exploded perspective view of the motor 1 shown in fig. 1. Fig. 3 is a sectional view of the motor 1 shown in fig. 1. The motor 1 shown in fig. 1 is a stepping motor, and is configured by a motor housing 10, a stator 20, a rotor 30, a bobbin 40, a cover 60, a sealing resin body 70, and the like, as described below with reference to fig. 2, 3, and the like. The electric motor 1 is used, for example, as a drive source of a gas/liquid mixture control valve (a member to be mounted) of a gasoline engine, and is required to have high airtightness in a mounted state. Therefore, the motor 1 is configured as a sealed motor.

The motor case 10 is formed in a cylindrical shape from a magnetic metal such as iron, and has a peripheral wall 11 extending in a cylindrical shape in the direction of the axis L and an end plate portion 12 formed to close an opening of one side La of the peripheral wall 11 in the direction of the axis L. The other side Lb of the peripheral wall 11 of the motor case 10 in the direction of the axis L is an opening 111, and a flange portion 13 protruding outward in the radial direction is formed at the edge of the opening.

The stator 20 is a cylindrical body disposed in the motor case 10, and includes a coil 21, a bobbin 40, a yoke 23 (outer stator core), and a yoke 24 (inner stator core). The yokes 23, 24 are annular plate members made of metal, and have a plurality of pole teeth 25 formed on the inner peripheral edge thereof at equal intervals in the circumferential direction and bent in the direction of the axis L. The yokes 23, 24 are arranged to face each other so that the pole teeth 25 are alternately arranged in the circumferential direction, and two sets of yokes 23, 24 are arranged in pairs in the direction of the axis L.

The bobbin 40 is a resin molded product obtained by molding the yokes 23 and 24 with a synthetic resin 41, and is configured by insert injection molding in a mold with the yokes 23 and 24 fitted in the mold. The synthetic resin 41 covers the portions other than the outer peripheral portions 232 and 242 of the yokes 23 and 24 and the inner peripheral surfaces of the teeth 25, and forms a space for the coil 21 between the portions (flange portions) overlapping the annular portions 233 and 243 of the yokes 23 and 24. The stator 20 configured as described above is disposed such that the outer peripheral portions 232 and 242 of the yokes 23 and 24 partially contact the peripheral wall 11 of the motor case 10.

A terminal block 45 is integrally formed at an end portion of the other side Lb of the bobbin 40 in the direction of the axis L, and an end portion (flange portion 13) of the other side Lb of the motor case 10 in the direction of the axis L abuts against the terminal block 45. The terminal block 45 holds a plurality of terminal pins 80 extending in a first direction X orthogonal to the direction of the axis L so as to be arranged in parallel in a second direction Y orthogonal to the direction of the axis L and the first direction X. The first end 81, which is one end of the terminal pin 80, protrudes from the first side surface 451, which is one side surface of the terminal block 45 in the first direction X. The first end portion 81 is a terminal for connecting a coil wire, and is covered with a cover 60 fixed to the bobbin 40 in a state where an end portion (not shown) of the coil wire constituting the coil 21 is connected by welding, soldering, or the like. In this state, the opening 111 of the motor case 10 is closed by the terminal block 45 and the cover 60. The second end 82, which is the other end of the terminal pin 80, is an external connection terminal protruding from a side surface 452 of the terminal block 45 different from the first side surface 451. In this embodiment, the first end 81 projects from the second side 452, which is the other side in the first direction X, and is used for electrical connection with the outside.

In the terminal block 45, a bearing hole 46 is formed in a portion located on one side La in the direction of the axis L so as to be recessed toward the other side Lb in the direction of the axis L. A cylindrical bearing member 96 is disposed inside the bearing hole 46, and the bearing member 96 supports the outer peripheral surface of the rotary shaft 31. A thrust support portion 95 formed of a metal ball 950 is supported by the bottom of the bearing hole 46, and an end portion 310 of the other side Lb of the rotary shaft 31 in the axis L direction, which will be described later, is supported from the other side Lb in the axis L direction.

The rotor 30 includes a rotating shaft 31 extending in the direction of the axis L and a cylindrical permanent magnet 32 fixed to the outer peripheral surface of the rotating shaft 31, and N-poles and S-poles are alternately magnetized in the circumferential direction on the outer peripheral surface of the permanent magnet 32. The pole teeth 25 of the stator 20 are opposed to the permanent magnets 32 on the radially outer side.

A hole 120 is formed in the end plate portion 12 of the motor case 10, and a part of the rotary shaft 31 protrudes from the hole 120 toward one side La in the direction of the axis L. In this embodiment, an output shaft 39 is formed in a portion of the rotary shaft 31 protruding from the end plate portion 12 of the motor case 10, and a spiral groove (not shown) is formed in the output shaft 39. Therefore, the spool and the like can be linearly driven by the rotation of the output shaft 39.

The bearing 92 is held in a hole 120 formed in the end plate portion 12 of the motor case 10. The bearing 92 includes a tube section 921 that rotatably supports the outer peripheral surface of the rotary shaft 31, and a diameter-enlarged section 922 that is enlarged radially outward from an end of the other side Lb in the direction of the axis L of the tube section 921, and the diameter-enlarged section 922 is fixed in a state of abutting against the end plate section 12 from the other side Lb in the direction of the axis L.

In the motor 1 configured as described above, the opening 111 of the motor case 10 is closed by the terminal block 45 and the cover 60 integrally formed with the bobbin 40, and in this state, the end portions in the axial L direction of the terminal block 45, the cover 60, and the motor case 10 are covered with the sealing resin body 70. The sealing resin body 70 has a bottom portion 73 that covers the other side Lb of the terminal block 45 and the cover 60 in the axis L direction, and a cylindrical portion 72 that covers the terminal block 45, the cover 60, and the motor case 10 from the side.

The second end 82 of the terminal pin 80 protrudes from the wall surface 76 of the sealing resin body 70. A cylindrical connector housing 78 is provided on the sealing resin body 70 so as to surround the periphery of the portion where the terminal pins 80 are arranged (the periphery of the wall surface 76), and a connector (not shown) is inserted into the connector housing 78 to electrically connect the terminal pins 80 and the terminals of the connector. In this mode, the connector is a waterproof connector.

A surface of the cylindrical portion 72 of the sealing resin body 70 facing the one side La in the direction of the axis L of the motor case 10 is a flange surface 77 for attachment to the air flow control valve. The flange surface 77 is formed by a plane orthogonal to the axial direction of the motor housing 10, and is configured to maintain airtightness with a sealing member such as an O-ring by inserting the motor housing 10 into, for example, an opening of the air flow control valve and bringing the motor housing into close contact with a planar attachment surface on the peripheral edge of the opening.

The sealing resin body 70 is a resin portion 71 formed to cover the terminal block 45, the cover 60, and the end portion of the motor case 10 in the direction of the axis L at the final stage of the assembly process, and is made of a thermoplastic resin or a thermosetting resin. In this embodiment, the resin portion 71 is made of a thermoplastic resin such as polybutylene terephthalate (PBT). The sealing resin body 70 is firmly fixed to the motor case 10 in a state where the opening 111 of the motor case 10 and the like are completely sealed. In this state, most of the motor case 10 is exposed except for a portion located on the other side Lb in the direction of the axis L. Therefore, the heat generated in the coil 21 can be efficiently discharged to the outside through the metal motor case 10. Therefore, insulation failure due to melting of the insulating film of the coil 21, thermal deformation of each member, thermal magnetization of the permanent magnet 32, and the like can be suppressed. Further, since the resin-coated portion is reduced, the diameter, weight, and cost can be reduced. Further, since the portion of the sealing resin body 70 covering the periphery of the motor housing 10 is pressed against the motor housing 10 when the sealing resin body 70 is molded, the flange surface 77 and the like can be formed with high accuracy. Therefore, the motor 1 can be assembled with high accuracy with reference to the flange surface 77.

(Structure of terminal pin 80 and terminal block 45, etc.)

Fig. 4 is an explanatory view of the terminal block 45 and the like shown in fig. 2 as viewed from the other side Lb in the direction of the axis L, and the output shaft 39 is not shown. As shown in fig. 4, the terminal pin 80 is a metal square bar, and in this embodiment, the terminal pin 80 has a rectangular cross section. The terminal pins 80 linearly extend in the first direction X. The terminal pin 80 has two crushed

portions

88 and 89 formed at intermediate positions in the extending direction. The crushed

portions

88 and 89 are formed by press working.

The terminal block 45 is provided with a substantially circular lid 453 on one side La in the direction of the axis L and a terminal holding portion 455 on the other side Lb in the direction of the axis L. A surface of one side La in the axis L direction of the lid 453 serves as a first end surface 453a against which a part of the opening edge (flange 13) of the motor case 10 abuts.

A plurality of grooves 456 extending in the first direction X and holding the terminal pins 80 inside are arranged in parallel in the second direction Y in the second end surface 450 on the other side in the direction of the axis L of the terminal block 45 (the second end surface 450 on the other side in the direction of the axis L of the terminal holding portion 455). The slot 456 extends to the first side 451 and the second side 452. In the second end surface 450, groove-

like recesses

450a and 450b are formed in portions sandwiched by the grooves 456 in the second direction Y. Of the crushed

portions

88 and 89 of the terminal pin 80, the crushed portion 88 is located inside the groove 456, and the crushed portion 89 is located at a position protruding from the second side surface 452. In this embodiment, since the crush portion 88 is formed in the portion of the terminal pin 80 located inside the groove 456, the portion that partially protrudes during the crush processing is recessed into the inner surface of the groove 456. Therefore, by pressing the terminal pin 80 into the groove 456, the terminal pin 80 can be pre-fixed to the groove 456 as appropriate.

(structures of the cover 60 and the first side 451, etc.)

Fig. 5 is a cross-sectional view of the terminal block 45 and the like shown in fig. 4 cut along the terminal pins 80. Fig. 6 is a perspective view of the cover 60 shown in fig. 2 attached to the first side surface 451 of the terminal block 45. Fig. 7 is a perspective view of the cover 60 removed from the state shown in fig. 6. Fig. 8 is a perspective view of the cover 60 shown in fig. 2. Fig. 9 is a side view of the cap 60 shown in fig. 2.

As shown in fig. 5 and 6, the terminal block 45 is provided with a step portion 454 protruding from the first end surface 453a of the lid portion 453 toward the one side La in the direction of the axis L, and the step portion 454 is formed radially inward of the lid portion 453. The outer peripheral surface 454a of the stepped portion 454 is formed in an arc shape having the same curvature radius as the inner peripheral surface of the peripheral wall 11 of the motor case 10 when viewed from the direction of the axis L, and abuts against the inner peripheral surface of the peripheral wall 11 of the motor case 10 from the radially inner side. The step portion 454 is circumferentially divided, and end portions 454b of the step portion 454 on both circumferential sides of the divided portion protrude from the first side surface 451 toward the cover 60.

A fourth protrusion 459 protruding toward the cover 60 is formed on the first side surface 451 of the terminal block 45 between the end portions 454b of the stepped portion 454. In the present embodiment, the fourth protrusions 459 are formed at two locations separated in the second direction Y.

In the first end surface 453a of the cap 453, a first receiving surface 457a facing one side La in the axis L direction is formed at a position partially overlapping the stepped portion 454 in the axis L direction, and the first receiving surface 457a is formed at two locations separated in the second direction Y at positions closer to the other side Lb in the axis L direction than the first end surface 453 a. Therefore, a recess 457, which opens at the first side surface 451, is formed between the first receiving surface 457a and the stepped portion 454. In the recess 457, a surface facing the second direction Y is a second receiving surface 457b, and the second receiving surfaces 457b formed at two locations separated in the second direction are opposite to each other in the circumferential direction.

In fig. 6, 8, and 9, the cover 60 is a resin molded article, and includes a main body portion 61 facing the first side surface 451 of the terminal block 45, a resin inflow prevention protrusion portion 63 protruding from an end portion of the other side Lb of the main body portion 61 in the axis L direction toward the terminal block 45, and second protrusion portions 64 protruding from an end portion of one side La of the main body portion 61 in the axis L direction toward the terminal block 45 at both circumferential ends of the main body portion 61. The cover 60 has a first protrusion 62 protruding from an end of the body 61 on one side La in the direction of the axis L toward the one side La in the direction of the axis L.

The outer peripheral surface 621 of the first convex portion 62 on the opposite side of the first side surface 451 extends in an arc shape along the opening edge of the motor case 10 at a position radially inward of the outer surface 611 of the main body portion 61 on the opposite side of the first side surface 451, and is an arc surface having the same curvature radius as the outer peripheral surface 454a of the stepped portion 454 when viewed in the axis L direction. Between the first convex portion 62 and the body portion 61, a support surface 610 is formed which comes into contact with a portion of the flange portion 13 of the motor case 10 other than the portion in contact with the first end surface 453a of the terminal block 45. In this embodiment, the first convex portion 62 is formed in a part of the circumferential direction of the body portion 61. In this embodiment, the first convex portion 62 is formed at the center in the circumferential direction of the body portion 61.

In first convex portion 62, concave portion 69 is formed on the surface facing first side surface 451, and inner walls 691, 692 of concave portion 69 facing in the circumferential direction become positioning portions 690 which abut against fourth convex portion 459 of terminal block 45 from one side and the other side in the circumferential direction to define the position in the circumferential direction of cover 60.

The protruding portion 63 includes a first plate portion 66 protruding from the end portion of the other side Lb of the body portion 61 in the direction of the axis L toward the terminal block 45 and covering the second end surface 450 of the terminal block 45, and a plurality of second plate portions 67 protruding from the first plate portion 66 to the one side La in the direction of the axis L in parallel in the second direction Y, and the plurality of second plate portions 67 are respectively fitted into the respective grooves 456 and cover the terminal pins 80 in the grooves 456. Therefore, when molding the sealing resin body 70, the resin can be prevented from diffusing around the terminal pin 80 and flowing into the inside of the cover 60.

A recess 65 having a first end 81 located inside is formed in a surface of the main body 61 facing the terminal block 45. In this embodiment, the concave portion 65 is partitioned into small concave portions 650 receiving the first end portions 81 of the plurality of terminal pins 80 by the partition wall 68.

A plurality of terminal pins 80 each extend linearly from the portion 84 located within the slot 456 to the first end 81. The surface 640 on the other side Lb of the second convex portion 64 in the direction of the axis L includes an inclined surface 641 inclined from the body portion 61 to the one side La in the direction of the axis L and extending toward the first receiving surface 457 a. Therefore, the first receiving surface 457a also becomes an inclined surface inclined similarly to the surface 640. Further, the surface 670 on the one side La in the direction of the axis L of the plurality of second plate portions 67 includes a first surface 671 inclined from the body portion 61 to the one side in the direction of the axis L and extending into the groove 456. In the present embodiment, the first surface 671 of the second plate portion 67 extends to a position further from the body portion 61 than the inclined surface 641 of the second projection 64, the surfaces 670 of the plurality of second plate portions 67 are respectively formed as second surfaces 672, these second surfaces 672 extend in the direction orthogonal to the direction of the axis L on the opposite side of the body portion 61 with respect to the first surface 671, and the second surfaces 672 cover the terminal pins 80 in the grooves 456.

When the cover 60 configured as described above is press-fitted to the terminal block 45 side so that the first convex portion 62 enters the inside of the opening 111 of the motor case 10, the second convex portion 64 fits inside the concave portion 457, and the first plate portion 66 of the protruding portion 63 overlaps the second end face 450 from the other side Lb in the direction of the axis L. In this state, the first convex portion 62 is fitted between the end portions 454b of the stepped portion 454 (a circumferentially divided portion of the stepped portion 454), and constitutes a disk portion. The support surface 610 of the main body portion 61 and the first end surface 453a of the lid portion 453 of the terminal block 45 form the same plane.

At this time, the second projection 64 is fitted into the inside of the recess 457, overlaps the first receiving surface 457a from one side La in the axial L direction, and overlaps the second receiving surface 457b from both sides in the circumferential direction. In addition, the two fourth protrusions 459 of the terminal block 45 are fitted into the recesses 69 of the cover 60. Therefore, the cover 60 is positioned on the terminal block 45 in the circumferential direction and the axis L direction. The first convex portion 62 and the stepped portion 454 are fitted into the motor case 10 from the opening 111 and abut against the peripheral wall 11 from the radially inner side. The opening edge (flange portion 13) of the motor case 10 abuts against the support surface 610 and the first end surface 453a of the cover 60, and the opening 111 of the motor case 10 is closed by the cover 60 and the terminal block 45.

In this state, as shown in fig. 5, the first end portions 81 of the plurality of terminal pins 80 are positioned inside the concave portion 650. However, the first end 81 does not abut against the inner wall 651 of the recess 650.

When the first plate portion 66 of the protruding portion 63 of the cover 60 overlaps the second end surface 450 from the other side Lb in the direction of the axis L, the second plate portion 67 covers the terminal pin 80 in the groove 456. In this state, the protruding portion 63 of the cover 60 covers the first end portion 81 side from the middle portion of the terminal pin 80, and the other portion of the terminal pin 80 (from the middle portion to the second end portion 82 side) is exposed from the cover 60. Therefore, when the sealing resin body 70 is formed by resin molding, the terminal pin 80 is covered with the sealing resin body 70 except for the portion covered with the cover 60 and the second end 82. At this time, since the crushed

portions

88 and 89 formed in the terminal pin 80 are both exposed from the cover 60, the portions where the crushed

portions

88 and 89 are formed are covered with the sealing resin body 70.

(main effect of the present embodiment)

As described above, in the motor 1 of this embodiment, the resin inflow prevention protrusion 63 of the cover 60 covers the portion of the second end surface 450 of the terminal block 45 on the first end 81 side. Therefore, the second end 82 of the terminal pin 80 passes through the slot 456 and protrudes from the terminal block 45, and therefore, it is not necessary to provide a hole or the like in the cover 60 through which the second end 82 protrudes. Therefore, the structure of the cover 60 can be simplified. In addition, the work of attaching the cover 60 can be performed efficiently. Further, since the portions of the plurality of terminal pins 80 that are positioned in the grooves 456 and exposed from the protruding portions 63 are sealed by the sealing resin body 70, moisture is less likely to enter the space (inside the cover 60) in which the first end portions 81 are arranged from the periphery of the terminal pins 80.

The protruding portion 63 has a first plate portion 66 covering the second end surface 450, and a plurality of second plate portions 67 protruding from the first plate portion 66 and fitting into the respective grooves 456. Therefore, when the sealing resin body 70 is formed by resin molding, the resin is less likely to flow into the inside of the cover 60 where the first end portion 81 is located via the groove 456. Therefore, when the resin sealing body 70 is molded, the coil wire is less likely to be broken by the resin flowing into the coil wire.

In addition, each of the plurality of terminal pins 80 extends linearly from the portion 84 located in the groove 456 to the first end portion 81, and in accordance with this configuration, the inclined surface 641 and the first surface 671 inclined from the body portion 61 toward the one side La in the direction of the axis L are provided on the surface 640 of the second convex portion 64 and the surface 670 of the second plate portion 67, respectively. Therefore, even in the case of a normal mold, the mold can be obliquely pulled out from between the first plate portion 66 and the second projecting portion 64 when the cover 60 is molded, and therefore, an expensive mold does not need to be used. That is, when the second plate portion 67 is configured to protrude in the direction of the axis L from the first plate portion 66 at a position overlapping the terminal block 45 so as to avoid the first end portion 81 when the cover 60 is attached, the mold cannot be pulled out from between the first plate portion 66 and the second protruding portion 64 in a normal mold.

In addition, the second plate portion 67 has a second surface 672 extending in a direction orthogonal to the direction of the axis L on the side opposite to the main body portion 61 with respect to the first surface 671, and therefore, the second plate portion 67 appropriately covers the terminal pins 80 in the grooves 456. Therefore, when the sealing resin body 70 is formed by resin molding, the resin is less likely to flow into the side where the first end portion 81 is located via the groove 456.

Further, since third convex portions 459 are formed on first side surface 451 of terminal block 45 and positioning portions 690 that come into contact with third convex portions 459 from one side and the other side in the circumferential direction are provided on cover 60, positioning in the circumferential direction of cover 60 can be easily performed.

The protruding portion 63 of the cover 60 covers the terminal block 45 from the other side Lb in the direction of the axis L, and the second protruding portion 64 of the cover 60 covers the first receiving surface 457a of the terminal block 45 from the one side La in the direction of the axis L. Therefore, since the terminal block 45 is sandwiched from both sides in the direction of the axis L by the protruding portion 63 and the second protruding portion 64 of the cover 60, the cover 60 can be appropriately positioned with respect to the terminal block 45. Therefore, the motor 1 can be assembled in a state where the opening 111 of the motor case 10 is appropriately closed by the terminal block 45 and the cover 60. Further, since the first receiving surface 457a is formed on the terminal block 45 at the other side Lb in the axis L direction from the first end surface 453a, the terminal block 45 is easily sandwiched from both sides in the axis L direction by the protruding portion 63 and the second protruding portion 64 of the cover 60.

The cover 60 is in contact with the inner circumferential surface of the motor case 10 from the radially inner side in a state where the first protruding portion 62 is in contact with the first side surface 451 of the terminal block 45. Therefore, the cover 60 can be easily disposed so as to close the opening 111 of the motor case 10. Further, the cover 60 and the terminal block 45 can be appropriately positioned in the first direction X in which the cover 60 and the terminal block 45 face each other. The terminal block 45 is provided with a step portion 454 protruding from the first end surface 451 to one side La in the direction of the axis L. Therefore, the motor 1 can be assembled in a state where the opening 111 of the motor case 10 is appropriately closed by the terminal block 45 and the cover 60.

Further, the first convex portion 62 is fitted between the end portions 454b of the stepped portions 454. The two second projections 64 abut against the second receiving surface 457b from the opposite side in the circumferential direction. In addition, the two fourth protrusions 459 of the terminal block 45 are fitted into the recesses 69 of the cover 60. Therefore, the cover 60 is positioned on the terminal block 45 in the circumferential direction and the axis L direction.

Further, since the flange portion 13 is formed at the opening edge of the motor case 10, even if the opening edge of the motor case 10 is brought into contact with the body portion 61 of the cover 60 and the first end surface 453a of the terminal block 45, the opening edge of the motor case 10, the body portion 61 of the cover 60, and the first end surface 453a of the terminal block 45 are not easily deformed.

(other embodiments)

Fig. 10 is an explanatory diagram of a modification 1 of the terminal pin 80 used in the motor 1 shown in fig. 1. Fig. 11 is an explanatory diagram of a modification 2 of the terminal pin 80 used in the motor 1 shown in fig. 1. Fig. 12 is an explanatory diagram of a modification 3 of the terminal pin 80 used in the motor 1 shown in fig. 1.

In the embodiment described with reference to fig. 1 to 9, the terminal pin 80 extends linearly, but the present invention can be applied to a case where the terminal pin has a bent portion. For example, as shown in fig. 10, the present invention can be applied to a case where the bent portion 822 is provided only on the second end 82 side and the second end 82 is located on the one side La in the axis L direction from the first end 81 or the portion 84 located in the groove 456. As shown in fig. 11, the present invention is also applicable to a case where the bent portion 821 is provided only on the first end portion 81 side and the first end portion 82 is located on the one side La in the axis L direction from the second end portion 82 or the portion 84 located in the groove 456. As shown in fig. 12, the present invention is also applicable to a case where the

bent portions

821 and 822 are provided on both the first end portion 81 side and the second terminal 82 side, and the first end portion 81 and the second end portion 82 are located on the one side La in the axis L direction with respect to the portion 84 located in the groove 456.

(other embodiments)

In the above embodiment, the motor 1 is a stepping motor, but the present invention can be applied to other types of motors.

Claims

1. An electric motor, comprising:

a rotor provided with a permanent magnet;

a stator opposing the permanent magnet;

a motor case that covers the rotor and the stator and has an end plate portion provided at one end in an axial direction;

a terminal block disposed on the other side of the motor case in the axial direction, and having a plurality of grooves formed in an end surface of the other side of the axial direction so as to be aligned in parallel in a second direction orthogonal to the axial direction and a first direction orthogonal to the axial direction, the first direction being orthogonal to the axial direction;

a plurality of terminal pins held inside the respective grooves, one end of the first direction, i.e., a first end portion for coil wire connection and the other end, i.e., a second end portion for external connection, protruding from different first and second side surfaces of the terminal block, respectively;

a cover that is disposed so as to cover the first end portion and that closes, together with the terminal block, an opening that is open on the other side of the motor case in the axial direction; and

a sealing resin body provided so as to cover the terminal block and the cover from the other side in the axial direction, covering a side surface of the motor case, and including a wall surface from which the second end portion protrudes,

the cover has: a main body portion opposed to the first side surface and against which an opening edge of the motor case abuts; and a protrusion portion for preventing resin from flowing into the terminal block and protruding from the main body portion and covering the terminal block from the other side in the axial direction,

the protruding portion has: a first plate portion overlapping the end surface; and a plurality of second plate portions that protrude from the first plate portion toward one side in the axial direction and fit into the respective grooves.

2. The motor according to claim 1,

the cover has a first protruding portion that protrudes to one side in the axial direction at a position radially inward of a position of the body portion, the position being in contact with an end portion of the motor housing, and that comes into contact with an inner peripheral surface of the motor housing from the radially inward side.

3. The motor according to claim 2,

the terminal block includes an arc-shaped step portion that comes into contact with the inner peripheral surface from the radially inner side,

the first convex portion abuts against the inner circumferential surface from a radially inner side in a state of being fitted into the circumferential cut portion of the stepped portion.

4. The motor according to claim 1,

a recess is formed in a surface of the main body portion facing the terminal block, the recess having the first end portion located inside.

5. The motor according to claim 4,

partition walls are provided in the concave portions, the partition walls partitioning between adjacent ones of the plurality of terminal pins in the second direction.

6. The motor according to claim 5,

the cover has a second projection projecting from the main body at a position separated from the projection toward one side in the axial direction and covering a first receiving surface of the terminal block toward one side in the axial direction.

7. The motor according to claim 6,

the second convex portion is formed at two locations separated in the second direction,

the terminal block includes second receiving surfaces against which the second protrusions are respectively abutted from opposite sides in the second direction.

8. The motor according to claim 7,

the plurality of terminal pins extend linearly from portions held in the plurality of grooves to the first end portion,

a surface of the second convex portion on the other side in the axial direction includes an inclined surface that is inclined from the main body portion to one side in the axial direction and extends toward the first receiving surface,

the second plate portions each have a first surface on one side in the axial direction, the first surfaces extending into the groove while being inclined from the main body portion to one side in the axial direction.

9. The motor according to claim 8,

the first surface extends to a position farther from the main body than the inclined surface,

the second plate portions have second surfaces on one side in the axial direction, respectively, and the second surfaces extend in a direction orthogonal to the axial direction, opposite to the main body portion, with respect to the first surfaces.

10. The motor according to any one of claims 1 to 9,

the terminal block is provided with a third projection for positioning projecting toward the cover,

the cover is provided with positioning portions which abut against the third convex portions from one side and the other side in the circumferential direction.