CN112771767A

CN112771767A - Motor device

Info

Publication number: CN112771767A
Application number: CN201980062949.5A
Authority: CN
Inventors: 石田祐子; 旦野太郎; 泷井直树
Original assignee: Koito Manufacturing Co Ltd; Nidec Servo Corp
Current assignee: Koito Manufacturing Co Ltd; Nidec Advanced Motor Corp
Priority date: 2018-09-28
Filing date: 2019-09-25
Publication date: 2021-05-07
Also published as: WO2020067206A1; JP2020054197A; JP7246153B2

Abstract

One embodiment of the present invention is a motor device including: a cylindrical member; and a stator having a stator core having an inner hole, an insulating member attached to the stator core, and a coil formed of a conductive wire wound around the stator core with the insulating member interposed therebetween. The stator core is attached to the cylindrical member such that an inner peripheral surface of the stator core contacts an outer peripheral surface of the cylindrical member. The insulating member has a cylindrical portion extending from the stator core along an outer circumferential surface of the cylindrical member. A protrusion that contacts the outer peripheral surface of the cylindrical member is formed at an end portion of the inner peripheral surface of the cylindrical portion. A recessed portion is provided on the outer peripheral surface of the cylindrical member at a position facing the protrusion.

Description

Motor device

Technical Field

The present invention relates to a motor device.

Background

Conventionally, in a motor device having a stator including a stator core and a coil formed of a conductive wire wound around the stator core with an insulating member interposed therebetween, a stator core is press-fitted into a cylindrical member. For example, japanese patent application laid-open No. 2013-252054 describes a motor device in which a stator is inserted into a stator press-fitting portion of a bearing holder, which is a cylindrical member, and the stator is press-fitted into the bearing holder.

Disclosure of Invention

Problems to be solved by the invention

However, when the stator is press-fitted into the cylindrical member, the inner peripheral surface of the stator strongly rubs against the outer peripheral surface of the cylindrical member, and thus, chips (cutting chips) may be generated. Therefore, it is necessary to avoid the influence of the chips generated during press-fitting on the reliability of the motor device.

Therefore, an object of the present invention is to improve sealing performance of chips generated by press-fitting a stator into a cylindrical member.

Means for solving the problems

An exemplary 1 st invention of the present application is a motor device having a cylindrical member; and a stator including a stator core having an inner hole, an insulating member attached to the stator core, and a coil formed of a conductive wire wound around the stator core with the insulating member interposed therebetween, wherein the stator core is attached to the cylindrical member such that an inner circumferential surface of the stator core is in contact with an outer circumferential surface of the cylindrical member, the insulating member includes a cylindrical portion extending from the stator core along the outer circumferential surface of the cylindrical member, a protrusion in contact with the outer circumferential surface of the cylindrical member is formed at an end portion of the inner circumferential surface of the cylindrical portion, and a recess portion is provided in the outer circumferential surface of the cylindrical member at a position facing the protrusion.

Effects of the invention

According to the present invention, the sealing performance of the chips generated by press-fitting the stator into the cylindrical member can be improved.

Drawings

Fig. 1 is a perspective view of a motor device according to an embodiment.

Fig. 2 is a perspective view of the motor device of the embodiment viewed from the other side.

Fig. 3 is a sectional view of the motor device of the embodiment.

Fig. 4 is an exploded perspective view of main components of the motor device according to the embodiment.

Fig. 5 is an exploded perspective view of the stator of the motor device of the embodiment, with the coil removed.

Fig. 6 is an enlarged front view of one insulator included in the stator.

Fig. 7 is an enlarged front view of another insulator included in the stator.

Fig. 8 is an enlarged front view of a stator of the motor device of the embodiment.

Fig. 9 is a view of the structure of the motor device according to the embodiment in an assembled state in which the stator is press-fitted into the sleeve as viewed from the circuit board side in the axial direction.

Fig. 10 is an enlarged sectional view of the assembled structure of fig. 9.

Fig. 11 is a partial cross-sectional view of the motor device according to the embodiment at the press-fitting start time in the step of press-fitting the stator into the sleeve.

Fig. 12 is a partial cross-sectional view of the motor device according to the embodiment during press-fitting of the stator into the sleeve.

Fig. 13 is a sectional view a-a of fig. 12.

Fig. 14 is a partial cross-sectional view of the motor device according to the embodiment at the time of completion of press-fitting in the step of press-fitting the stator into the sleeve.

Fig. 15 is a horizontal cross-sectional view of a vehicle headlamp to which the motor device of the embodiment is applied.

Detailed Description

The present invention relates to the patent application of Japanese patent application 2018-184374, filed by the Japanese patent office in 2018, 9, 28, the entire contents of which are incorporated herein by reference.

Hereinafter, embodiments of the motor device of the present invention will be described.

(1) Schematic structure of motor device 1 of the embodiment

Hereinafter, a schematic configuration of the motor device 1 according to the embodiment will be described with reference to fig. 1 to 4.

Fig. 1 is a perspective view of a motor device 1 according to an embodiment. Fig. 2 is a perspective view of the motor device 1 of the embodiment as viewed from the other side. Fig. 3 is a sectional view of the motor device 1 of the embodiment. Fig. 4 is an exploded perspective view of main components of the motor device 1 according to the embodiment.

In the following description, "axial direction" means the axial direction of the sleeve 9 of the motor device 1. The axial direction is equivalent to the rotation axis (axis CTR of fig. 3) of the shaft 5 as the rotation axis of the motor.

As shown in fig. 1 to 3, an exemplary motor device 1 according to the present embodiment includes a circuit board 3, a yoke 4, a shaft 5, a rotor 6, a cover 2 covering the rotor 6, and a stator 8, and rotates the rotor 6 by a DC brushless motor.

The cover 2 is made of, for example, resin and has a bottomed rectangular parallelepiped shape. As shown in fig. 4, a sleeve 9 (an example of a cylindrical member) is attached to the cover 2. The sleeve 9 is made of metal such as iron or aluminum, for example, and is disposed in a hole provided at the center of the circular bottom of the cover 2. The cover 2 and the sleeve 9 are integrated by insert molding.

The circuit board 3 is electrically connected to a coil (winding) 83 of the stator 8 via a conductive pin 84 (an example of a conductive member; see fig. 3 and 4), and a control circuit (not shown) is mounted on the circuit board 3. The circuit board 3 supplies current to the coil 83.

As shown in fig. 4, the circuit board 3 has a1 st surface 3a which is a surface on the yoke 4 side and a2 nd surface 3b which is a surface on the cover 2 side, and the 2 nd surface 3b is a surface on the back side of the 1 st surface 3 a. The 1 st surface 3a is a main mounting surface on which main circuit components are mounted.

An inner hole 3h is formed near the center of the circuit board 3, and the circuit board 3 and the sleeve 9 are coupled by press-fitting the inner hole 3h to the outer peripheral surface of the sleeve 9.

The circuit board 3 has 2 through holes 32. As shown in fig. 2 and 3, the screw 22 is fastened to the cover 2 through the through hole 32, thereby restricting displacement of the circuit board 3 with respect to the circumferential direction of the cover 2. The cover 2 is disposed to face a2 nd surface 3b of the circuit board 3 opposite to the 1 st surface 3a, and covers the 2 nd surface 3b of the circuit board 3.

As shown in fig. 4, the cover 2 has 2 openings 24, and the circuit board 3 has 2 through holes 34. As described later, in the motor device 1 of the present embodiment, the other end of the conductive pin 84 having one end fixed to the coil 83 of the stator 8 is soldered to the 2 nd surface 3b (the surface on the cover 2 side) of the circuit board 3 through the through hole 34 of the circuit board 3. The opening 24 of the cover 2 is provided for efficiently performing the welding work of the conduction pin 84.

As shown in fig. 3, the shaft 5 extends in the axial direction of the motor device 1. One end of the shaft 5 is fixed to the support portion 41. The support portion 41 is made of, for example, metal, and the yoke 4 and the support portion 41 are joined by pressure-bonding the support portion 41. The support portion 41 is pressed against the inner surface (left direction in fig. 3) of the yoke 4 in the axial direction in fig. 3 by the biasing force of the coil spring 53 provided between the support portion and the bearing 52.

One end of the shaft 5 is press-fitted into the support portion 41, and the other end of the shaft 5 is fixed to the rotating body 6. The shaft 5 penetrates the inside of the sleeve 9, and is supported by a bearing 51 and a bearing 52 at one end side and the other end side in the axial direction of the sleeve 9, respectively.

As shown in fig. 2 and 4, the yoke 4 has a substantially annular shape. A magnet 7 (see fig. 3) is press-fitted into the inner peripheral surface of the yoke 4. The magnets 7 are magnetized such that N poles and S poles are alternately arranged in the circumferential direction. The yoke 4 is made of a magnetic material and prevents a magnetic field formed by the magnet 7 from leaking to the outside of the magnet 7.

As shown in fig. 3, the stator 8 is disposed to face the 1 st surface 3a of the circuit board 3, and includes a stator core 81, an insulating member 82 attached to the stator core 81, and a coil 83 formed of a conductive wire wound around the stator core 81 with the insulating member 82 interposed therebetween.

In the present embodiment, the magnet 7 and the shaft 5 constitute a rotor. The motor of the present embodiment is an outer rotor type DC brushless motor having a rotor radially outside the stator 8.

(2) Structure of stator 8 of the embodiment

Next, the structure of the stator 8 will be described in further detail with reference to fig. 5 to 8.

Fig. 5 is an exploded perspective view of the stator 8 excluding the coil 83. Fig. 6 is an enlarged front view of the 1 st insulator 82A as viewed from the yoke 4 side in the axial direction. Fig. 7 is an enlarged front view of the 2 nd insulator 82B as viewed from the rotary body 6 side in the axial direction. Fig. 8 is an enlarged front view of the stator 8 (a view when viewed from the yoke 4 side).

Fig. 5 shows a stator core 81, an insulating member 82 (1

st insulator

82A, 2 nd insulator 82B), and a conduction pin 84. The insulating member 82 is made of resin, and is manufactured by injection molding, for example.

As shown in fig. 5, the stator core 81 is a laminated body in which a plurality of magnetic steel plates are laminated and fixed in the axial direction (the left-right direction in fig. 3), and has a plurality of teeth 811. In the example of the present embodiment, teeth 811 are provided at intervals of 90 degrees in the circumferential direction of stator core 81.

An inner hole 81h is formed at a central portion of the stator core 81. The inner circumferential surface 81a of the inner hole 81h is press-fitted into the outer circumferential surface of the sleeve 9 when the stator 8 is coupled to the sleeve 9. That is, the stator core 81 is attached to the sleeve 9 such that the inner circumferential surface 81a of the inner hole 81h of the stator core 81 contacts the outer circumferential surface of the sleeve 9.

As shown in fig. 5, the insulating member 82 is made of an insulating material such as rubber or resin, and is configured by a1 st insulator 82A and a2 nd insulator 82B sandwiching the stator core 81 from both sides to insulate the coil 83 and the teeth 811. The 1 st insulator 82A and the 2 nd insulator 82B have an inner hole 82Ah and an inner hole 82Bh for insertion of the sleeve 9.

As shown in fig. 5 and 6, the 1 st insulator 82A has tooth cover portions 821A corresponding to the teeth 811 of the stator core 81 at 90-degree intervals in the circumferential direction of the inner hole 82 Ah. The 1 st insulator 82A has an inner circumferential wall 823A extending in the axial direction at the peripheral edge of the inner hole 82 Ah. That is, the inner circumferential wall 823A extends in the axial direction on the side opposite to the side where the stator core 81 is provided, with reference to the tooth cover portion 821A. Wall 822A extends in the axial direction on the side where stator core 81 is provided with reference to tooth cover 821A.

As shown in fig. 5 and 7, the 2 nd insulator 82B has tooth cover portions 821B at 90-degree intervals in the circumferential direction of the inner hole 82Bh so as to correspond to the teeth 811 of the stator core 81. The 2 nd insulator 82B has a cylindrical portion 823B extending in the axial direction at the peripheral edge of the inner hole 82 Bh. That is, the cylindrical portion 823B extends in the axial direction on the side opposite to the side where the stator core 81 is provided, with respect to the tooth cover portion 821B. Wall 822B extends in the axial direction on the side where stator core 81 is provided with reference to tooth cover 821B.

As described above, the 1 st insulator 82A and the 2 nd insulator 82B each have the inner circumferential wall 823A and the cylindrical portion 823B that extend along the circumferential edge of the inner hole 81h of the stator core 81 and in the axial direction of the sleeve 9 into which the stator 8 is press-fitted, and that isolate the teeth 811 of the stator core 81 from the coil 83. By providing the inner circumferential wall 823A and the cylindrical portion 823B, insulation between the coil 83 and the teeth 811 is reliably performed.

Referring again to fig. 5 and 6, a notch 823Ah is formed in the inner peripheral wall 823A of the 1 st insulator 82A. As described later, the notch 823Ah is provided to expose the surface of the stator core 81 when the stator 8 is assembled, and to facilitate the press-fitting operation of the stator 8 into the sleeve 9. That is, the 1 st insulator 82A has a notch 823Ah at the peripheral edge of the inner hole 82Ah corresponding to the exposed surface of the stator core 81.

Further, in the notch portion 823Ah, a projection 823Aj is provided radially outward from the inner circumferential wall 823A. Projection 823Aj is provided to reliably insulate coil 83 from tooth 811 in notch 823 Ah.

Referring to fig. 5 and 7, the 2 nd insulator 82B has a cylindrical portion 824B extending in the axial direction and through which the conduction pin 84 passes. The cylindrical portion 824B is supported by the wall portion 822B formed in the axial direction, and thus the strength of the cylindrical portion 824B can be sufficiently ensured.

In addition, no notch portion is provided in the cylindrical portion 823B of the 2 nd insulator 82B.

After the stator core 81 is sandwiched between the 1 st insulator 82A and the 2 nd insulator 82B from both sides, the coil 83 is formed by winding a wire around the tooth cover portions 821A, the teeth 811, and the tooth cover portions 821B, and the stator 8 is assembled as shown in fig. 8.

After the stator 8 is assembled, as shown in fig. 5, the conducting pin 84 is inserted into the cylindrical portion 824B, and one end of the conducting pin 84 and one end of the coil 83 are welded together.

(3) Pressing in of stator 8 relative to sleeve 9

Next, the press-fitting of the stator 8 into the sleeve 9 when the motor device 1 of the present embodiment is assembled will be described with reference to fig. 8 to 10.

Fig. 9 is a view of the structure of the motor device 1 according to the present embodiment in an assembled state after the stator 8 is press-fitted into the sleeve 9, as viewed from the 1 st surface 3a side of the circuit board 3 in the axial direction. In assembling the motor device 1 of the present embodiment, the circuit board 3 is fixed to the cover 2 before the stator 8 is press-fitted into the sleeve 9. Fig. 10 is an enlarged sectional view of the assembled structure of fig. 9.

As shown in fig. 10, when the stator 8 is pressed into the sleeve 9, the following procedure is performed: the inner circumferential surface 81a of the inner hole 81h of the stator core 81 of the stator 8 is brought into contact with the outer circumferential surface 9a of the sleeve 9 in the axial direction (the press-fitting direction D from the 1 st surface 3a toward the 2 nd surface 3b of the circuit board 3). The cover 2 is fixed to the apparatus at the time of press-fitting, and the stator 8 is press-fitted by a predetermined amount in the press-fitting direction by a press-fitting jig.

Further, since the one end of the conducting pin 84 is welded to the coil 83 at the time of press-fitting the stator 8 as described above, the worker can avoid erroneously press-fitting the stator 8 in the direction of the stator 8 by checking whether the end of the conducting pin 84 is welded.

In the present embodiment, since a part of the stator core 81 is exposed when the stator 8 is press-fitted by the press-fitting jig, the stator 8 can be reliably press-fitted into the sleeve 9 by pressing the jig so as to be in contact with the exposed surface of the stator core 81.

More specifically, as shown in fig. 8, since the stator core 81 of the stator 8 has an exposed surface exposed when viewed from the pressing jig side in the axial direction of the sleeve 9, the inner peripheral surface 81a of the inner hole 81h of the stator core 81 can be reliably pressed into the outer peripheral surface 9a of the sleeve 9 by bringing the pressing jig into contact with the exposed surface and pressing in the axial direction (direction toward the back side of the paper surface in fig. 8).

The exposed surface of the stator core 81 shown in fig. 8 includes a peripheral edge portion 811a of the surface of the stator core 81 along the peripheral edge of the inner hole 81h of the stator core 81. The peripheral edge portion 811a of the inner hole 81h in the exposed surface is located on the surface of the stator core 81 at a position closest to the outer peripheral surface 9a of the sleeve 9 when the stator 8 is press-fitted into the sleeve 9, and the press-fitting jig is brought into contact with the peripheral edge portion 811a, whereby the stator 8 can be press-fitted more reliably.

As described with reference to fig. 6, a notch 823Ah is formed in the inner peripheral wall 823A of the 1 st insulator 82A. Therefore, after the 1 st insulator 82A is assembled to the stator core 81, as shown in fig. 8, a protruding region 811p of an exposed surface of the stator core 81 exposed through the notch 823Ah is formed. In the present embodiment, the protruding region 811p is a region protruding from the peripheral edge of the inner hole 81h of the stator core 81 in the radial direction of the stator core 81.

If the inner peripheral wall 823A of the 1 st insulator 82A is provided outside the state shown in fig. 6, the peripheral edge region 811a of the exposed surface can be enlarged. However, as shown in fig. 3, the outer shape of the entire stator 8 cannot be enlarged to secure a gap between the magnets 7, and therefore the peripheral edge portion 811a of the enlarged exposed surface sacrifices the radial dimension of the coil 83 and the teeth 811, and affects the performance of the motor. Therefore, the notch 823Ah is provided partially in the circumferential direction in the inner circumferential wall 823A of the 1 st insulator 82A, and thereby the protruding region 811p of the exposed surface of the stator core 81 is provided. Therefore, the effective exposure area can be ensured without affecting the performance of the motor.

In the example of the present embodiment, 4 protruding regions 811p of exposed surfaces are formed along the peripheral edge of the inner hole 81h of the stator core 81. The stator 8 is press-fitted in the press-fitting direction D by using a press-fitting jig that simultaneously contacts the 4 protruding regions 811p of the exposed surface. Since the 4-part protruding regions 811p are located relatively close to the outer peripheral surface 9a of the sleeve 9, the stator 8 can be reliably press-fitted.

In the example of the present embodiment, the protruding regions 811p of the exposed surface of the stator core 81 are arranged at equal intervals in the circumferential direction of the inner hole 81h of the stator core 81. In this example, the protruding regions 811p of the exposed surface of the stator core 81 at 4 locations are provided at equal intervals in the circumferential direction between the adjacent teeth 811 of the stator core 81. That is, in fig. 8, since the protruding region 811p is provided toward the portion where the coil 83 is not wound, the coil 83 has little influence on the arrangement of the stator 8.

As described with reference to fig. 6, the 1 st insulator 82A is provided with a projection 823Aj in the notch portion 823Ah from the inner circumferential wall 823A toward the radial outside. Therefore, in the state where the stator 8 is assembled, as shown in fig. 8, the projection 823Aj of the 1 st insulator 82A is configured to surround at least a part of the projection region 811p of the exposed surface of the stator core 81. Therefore, the teeth 811 in the protruding region 811p and the coil 83 can be reliably insulated from each other.

In addition, the cylindrical portion 823B of the 2 nd insulator 82B is not provided with a notch portion, unlike the inner circumferential wall 823A of the 1 st insulator 82A. Therefore, when the stator 8 is viewed from the 2 nd insulator 82B side in a state where the stator 8 is assembled, a protruding region that protrudes radially outward from the inner hole 81h is not formed on the exposed surface of the stator core 81. That is, the protruding region is provided only on the 1 st insulator 82A side surface of the stator core 81 in the axial direction of the sleeve 9, and is not provided on the 2 nd insulator 82B side surface of the stator core 81 in the axial direction of the sleeve 9. Therefore, by confirming the exposed surfaces of the stator cores 81 on both sides of the stator 8, it is possible to prevent the worker from erroneously assembling the stator 8 in the direction of wrong insertion when the worker pushes the stator 8 into the sleeve 9.

(4) Sealing during pressing of the stator 8 into the sleeve 9

When the stator 8 is press-fitted into the sleeve 9, chips (cutting chips) may be generated by strong friction between the inner circumferential surface of the stator 8 and the outer circumferential surface of the sleeve 9. In this case, the generated chips move to the circuit board 3 and adhere thereto, and there is a possibility that a trouble such as an electrical short circuit occurs. Therefore, in the motor device 1 of the present embodiment, as described below, the gap between the stator 8 and the sleeve 9 is reliably sealed so that chips that may be generated during press-fitting do not move toward the circuit board 3.

Sealing when the stator 8 is press-fitted into the sleeve 9 will be described below with reference to fig. 11 to 14. Fig. 11 is a partial cross-sectional view of the motor device 1 according to the embodiment at the start time of press-fitting in the step of press-fitting the stator 8 into the sleeve 9. Fig. 12 is a partial cross-sectional view of the motor device 1 according to the embodiment during the press-fitting process of the stator 8 into the sleeve 9. Fig. 13 is a sectional view a-a of fig. 12. Fig. 14 is a partial cross-sectional view of the motor device 1 according to the embodiment at the time of completion of press-fitting in the step of press-fitting the stator 8 into the sleeve 9.

In each of fig. 11, 12, and 14, (b) shows an enlarged view of a portion E in (a).

As shown in fig. 11, the cylindrical portion 823B of the 2 nd insulator 82B extends from the stator core 81 toward the circuit board 3 along the outer circumferential surface of the sleeve 9. A protrusion 825B is formed at an end portion of the inner circumferential surface 823Bs of the cylindrical portion 823B. The projection 825B is provided for sealing purposes so that chips generated during pressing of the stator 8 into the sleeve 9 do not fall onto the circuit board 3.

Since the 2 nd insulator 82B is a resin member manufactured by injection molding, for example, as described above, the end portion passing through the inner peripheral surface 823Bs corresponds to the parting surface of the mold, and thus the burr Br is generated as shown in fig. 11.

As shown in fig. 11 (b), the outer peripheral surface 9a of the sleeve 9 has a small-diameter outer peripheral surface 9a1 formed continuously in the press-fitting direction, an outer peripheral surface 9a2 linearly expanded in diameter from the outer peripheral surface 9a1, and a large-diameter outer peripheral surface 9a 3. Further, a recessed portion 93d is provided in the entire circumferential range of the outer circumferential surface 9a3 of the sleeve 9.

(4-1) Press-in Start timing

As shown in fig. 11, at the press-fitting start time of the press-fitting step when the stator 8 is press-fitted into the sleeve 9, the projection surface 825Bs of the projection 825B is configured to contact the outer peripheral surface 9a3 of the sleeve 9. Since the press-fitting direction is the downward direction in fig. 11, the projection surface 825Bs is in a state of being in contact with the outer peripheral surface 9a3 throughout the press-fitting step. Therefore, chips generated by strong friction between the inner circumferential surface of the stator 8 and the outer circumferential surface of the sleeve 9 in the press-fitting step can be prevented from moving toward the circuit board 3 from the gap between the inner circumferential surface 823Bs and the outer circumferential surface 9a3 of the 2 nd insulator 82B. I.e. between the stator 8 and the sleeve 9, so that no swarf can move onto the circuit board 3.

(4-2) halfway through the pressing

Fig. 12 shows a state in which the press-fitting is performed from the state of fig. 11. In the state of fig. 12, the 2 nd insulator 82B moves relatively downward with respect to the sleeve 9 as compared with the state of fig. 11.

As shown in fig. 12 (B), in this state, the projection 825B is positioned on the outer peripheral surface 9a3, but since the burr Br is formed on the projection surface 825Bs, the projection surface 825Bs is in a state of floating from the outer peripheral surface 9a 3. Therefore, as shown in fig. 13, a gap is formed between the projection surface 825Bs and the outer peripheral surface 9a3, and the seal between the stator 8 and the sleeve 9 is incomplete.

(4-3) end time of Press-in

At the press-fitting completion time, as shown in fig. 12, the recessed portion 93d of the outer peripheral surface 9a3 of the sleeve 9 is provided at a position facing the projection 825B. Therefore, the burr Br formed on the projection surface 825Bs of the projection 825B is received in the recessed portion 93d, and the projection surface 825Bs is in contact with the outer peripheral surface 9a3 without a gap. Therefore, at the press-fitting completion time when the stator 8 is press-fitted into the sleeve 9, the generated chips are reliably sealed between the inner peripheral surface 823Bs of the stator 8 and the outer peripheral surface of the sleeve 9, and the reliability of the motor device 1 can be unaffected.

(5) Application example of the motor device 1 of the present embodiment

Next, as an application example of the motor device 1 of the present embodiment described above, a schematic description will be given of a vehicle headlamp on which the motor device 1 of the present embodiment can be mounted, with reference to fig. 15. Fig. 15 is a horizontal sectional view of the vehicle headlamp. The vehicle headlamp 10 shown in fig. 15 is a left-side headlamp mounted on the left side of the front end of the automobile, and has the same structure as the right-side headlamp except for being bilaterally symmetrical. Therefore, the left vehicle headlamp 10 will be described in detail below, and the right vehicle headlamp will not be described.

As shown in fig. 15, the vehicle headlamp 10 includes a lamp body 12, and the lamp body 12 has a recess that opens toward the front. The front surface opening of the lamp body 12 is covered with a transparent front cover 14 to form a lamp chamber 16. The lamp chamber 16 functions as a space for accommodating the lamp unit 18.

The lamp unit 18 is a unit using an ADB (Adaptive Driving Beam) technique of a leaf scanning system, and is configured to emit so-called variable high Beam. The lamp unit 18 has an optical unit 20 and a projection lens 27. The optical unit 20 has a rotating reflector 60 and a light source 26. The projection lens 27 is, for example, a convex lens. The shape of the convex lens may be appropriately selected according to the required light distribution characteristics such as the light distribution pattern and the illuminance distribution, and an aspherical lens or a free-form lens may be used. Further, an extension reflector 23 is provided around the projection lens 27.

The rotating reflector 60 is constituted by: the motor 30 serving as a driving source reflects light emitted from the light source 26 while rotating the blade 60b in one direction about the rotation axis R, and forms a light distribution pattern by scanning the reflected light. The blade 60b has an annular reflection region 60a, and the annular reflection region 60a is configured to reflect light emitted from the light source 26 while rotating, thereby forming a desired light distribution pattern.

The blade 60b of the rotating mirror 60 is shaped so that the 2 nd order light source by the reflected light source 26 is formed in the vicinity of the focal point of the projection lens 27. The blade 60b has a twisted shape such that the angle formed by the optical axis Ax and the reflecting surface changes in the circumferential direction around the rotation axis R. This enables scanning of light (light source image) using the light source 26.

The light source 26 is preferably a light source capable of controlling on/off in a short time, and is preferably a semiconductor light emitting element such as an LED, an LD, or an EL element.

The motor 30 is mounted on the substrate 92. The substrate 92 is mounted on and fixed to a mounting surface 94a of the heat sink 94. The rotation axis R of the rotary mirror 60 is inclined with respect to the optical axis Ax or the vehicle front direction in a state where the substrate 92 is mounted on the mounting surface 94 a.

The light source 26 is mounted on the substrate 36. In addition, a lens 38 as a primary optical system is provided in the light exit direction of the light source 26 and between the rotating reflector 60. The lens 38 condenses light emitted from the light source 26 so that the light emitted from the light source 26 is directed toward the reflection region 60a of the rotating reflector 60. The substrate 36 is mounted on the heat sink 40. The heat sink 94 and the heat sink 40 are fixed to the metal plate-like support member 42. The lamp unit 18 is supported via the support member 42 to be tiltable with respect to the lamp body 12 by a unit using an adjustment screw 44 and a nut 46.

The control circuit 48 is connected to the light source 26 and the motor 30 via the respective boards, and performs transmission of a signal for controlling the light source 26 or the motor 30 and reception of a signal output from the motor 30.

In the vehicle headlamp 10, the rotating reflector 60 corresponds to the rotating body 6 of the motor device 1 of the present embodiment, and the motor 30 corresponds to the motor of the motor device 1 of the present embodiment. As described above, the motor device 1 of the present embodiment can be applied to the vehicle headlamp 10.

The embodiments of the motor device of the present invention have been described in detail, but the scope of the present invention is not limited to the above embodiments. In addition, the above embodiment can be modified and changed variously without departing from the scope of the present invention.

Claims

1. A motor device, comprising:

a cylindrical member; and

a stator having a stator core having an inner hole, an insulating member attached to the stator core, and a coil formed of a wire wound around the stator core with the insulating member interposed therebetween,

the stator core is attached to the cylindrical member such that an inner peripheral surface of the stator core is in contact with an outer peripheral surface of the cylindrical member,

the insulating member has a cylindrical portion extending from the stator core along an outer circumferential surface of the cylindrical member,

a protrusion that contacts the outer peripheral surface of the cylindrical member is formed at an end portion of the inner peripheral surface of the cylindrical portion,

a recessed portion is provided on the outer peripheral surface of the cylindrical member at a position facing the projection.

2. The motor apparatus according to claim 1,

the cylindrical member and the stator core are fitted together by press-fitting,

the cylindrical member and the stator core are configured such that the protrusion comes into contact with an outer peripheral surface of the cylindrical member at the start of press-fitting.

3. The motor apparatus according to claim 1 or 2,

the insulating member is made of resin.