Motor device

Abstract

One embodiment of the present invention is a motor device, which has: a cylindrical component; and a stator, which has a stator core, an insulating component, and a coil, wherein the stator core has an inner hole, the insulating component is mounted on the stator core, and the coil is composed of a conductive wire wound on the stator core through the insulating component. The stator core is mounted on the cylindrical component in such a way that the inner circumferential surface of the stator core contacts the outer circumferential surface of the cylindrical component. The insulating component has a cylindrical portion extending from the stator core along the outer circumferential surface of the cylindrical component. A protrusion that contacts the outer circumferential surface of the cylindrical component is formed at the end of the inner circumferential surface of the cylindrical portion. A recessed portion is provided on the outer circumferential surface of the cylindrical component at a position opposite to the protrusion.

Description

Technical Field

[0001] The present invention relates to a motor device. Background Art

[0002] Conventionally, it is known that in a motor device having a stator, a stator core is pressed into a cylindrical member, and the stator has a stator core and a coil composed of a conductive wire wound around the stator core via an insulating member. For example, in a motor device described in Japanese Patent Application Laid-Open No. 2013-252054, it is described that the stator is pressed into the bearing holder by inserting the stator into a stator press-fit portion of a bearing holder that is a cylindrical member. Summary of the invention

[0003] Problems to be solved by the invention

[0004] However, when the stator is pressed into the cylindrical member, the inner circumferential surface of the stator and the outer circumferential surface of the cylindrical member rub strongly, sometimes generating chips (cutting chips). Therefore, it is necessary to prevent the chips generated during the press-fitting from affecting the reliability of the motor device.

[0005] Therefore, an object of the present invention is to improve the sealing performance of chips generated by press-fitting a stator into a cylindrical member.

[0006] Means for solving problems

[0007] The first invention illustrated in the present application is a motor device, which has a cylindrical component; and a stator, which has a stator core, an insulating component and a coil, the stator core having an inner hole, the insulating component being mounted on the stator core, the coil being composed of a conductive wire wound on the stator core via the insulating component, the stator core being mounted on the cylindrical component in such a manner that the inner circumferential surface of the stator core contacts the outer circumferential surface of the cylindrical component, the insulating component having a cylindrical portion extending from the stator core along the outer circumferential surface of the cylindrical component, a protrusion being formed at the end of the inner circumferential surface of the cylindrical portion and contacting the outer circumferential surface of the cylindrical component, and a recessed portion being provided on the outer circumferential surface of the cylindrical component at a position opposite to the protrusion.

[0008] Effects of the Invention

[0009] According to the present invention, it is possible to improve the sealing performance of chips generated by press-fitting the stator into the cylindrical member. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a perspective view of the motor device according to the embodiment as seen from one side.

[0011] Figure 2 This is a perspective view of the motor device according to the embodiment as seen from the other side.

[0012] Figure 3 It is a cross-sectional view of the motor device according to the embodiment.

[0013] Figure 4 It is an exploded perspective view of main parts of the motor device according to the embodiment.

[0014] Figure 5 This is an exploded perspective view of the stator of the motor device according to the embodiment, with the coil removed.

[0015] Figure 6 is an enlarged front view of one of the insulators included in the stator.

[0016] Figure 7 is an enlarged front view of another insulator included in the stator.

[0017] Figure 8 It is an enlarged front view of the stator of the motor device according to the embodiment.

[0018] Fig. 9 This is a diagram showing the structure of an assembled state after the stator is pressed into the sleeve when assembling the motor device of the embodiment, as viewed from the circuit board side in the axial direction.

[0019] Fig.10 yes Fig. 9 An enlarged cross-sectional view of the structure in the assembled state.

[0020] Fig.11 This is a partial cross-sectional view of the motor device according to the embodiment at the start of press-fitting in a process of press-fitting a stator into a sleeve.

[0021] Fig.12 This is a partial cross-sectional view of the motor device according to the embodiment when the stator is being pressed into the sleeve.

[0022] Fig.13 yes Fig.12 AA section view.

[0023] Fig.14 This is a partial cross-sectional view of the motor device according to the embodiment at the time of completion of the press-fitting process of the stator into the sleeve.

[0024] Fig.15 It is a horizontal cross-sectional view of a vehicle headlamp to which the motor device according to the embodiment is applied. DETAILED DESCRIPTION

[0025] The present invention relates to Japanese patent application No. 2018-184374 filed with the Japan Patent Office on September 28, 2018, the entire contents of which are incorporated herein by reference.

[0026] Hereinafter, embodiments of the motor device according to the present invention will be described.

[0027] (1) Schematic Structure of Motor Device 1 According to Embodiment

[0028] Below, refer to Figure 1 to Figure 4 A schematic structure of the motor device 1 according to the embodiment will be described.

[0029] Figure 1 This is a perspective view of the motor device 1 according to the embodiment as seen from one side. Figure 2 This is a perspective view of the motor device 1 according to the embodiment as seen from the other side. Figure 3 It is a cross-sectional view of the motor device 1 according to the embodiment. Figure 4 It is an exploded perspective view of main parts of the motor device 1 according to the embodiment.

[0030] 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 of the shaft 5 which is the rotation axis of the motor ( Figure 3 axis CTR).

[0031] like Figure 1 to Figure 3 As shown, the motor device 1 of the embodiment includes a circuit board 3, a yoke 4, a shaft 5, a rotating body 6, a cover 2 covering the rotating body 6, and a stator 8, and is a device that rotates the rotating body 6 by a DC brushless motor.

[0032] The cover 2 is made of resin, for example, and has a rectangular parallelepiped shape with a bottom. Figure 4 As shown, a sleeve 9 (an example of a cylindrical member) is mounted on the cover 2. The sleeve 9 is made of metal such as iron or aluminum, and is disposed in a hole provided in the center of the circular bottom of the cover 2. The cover 2 and the sleeve 9 are integrated by insert molding.

[0033] The circuit board 3 and the coil (winding) 83 of the stator 8 are connected via a conducting pin 84 (an example of a conductive member; see Figure 3 and Figure 4 ) is turned on, and a control circuit (not shown) is mounted on the circuit board 3. The circuit board 3 provides current to the coil 83.

[0034] like Figure 4 As shown, the circuit board 3 has a first surface 3a as a surface on the yoke 4 side and a second surface 3b as a surface on the cover 2 side. The second surface 3b is a surface on the back side of the first surface 3a. The first surface 3a is a main mounting surface on which main circuit components are mounted.

[0035] An inner hole 3 h is formed near the center of the circuit board 3 , and the circuit board 3 and the sleeve 9 are connected by press-fitting the inner hole 3 h into the outer peripheral surface of the sleeve 9 .

[0036] The circuit board 3 has two through holes 32. Figure 2 and Figure 3 As shown, the screws 22 pass through the through holes 32 and are fastened to the cover 2, thereby limiting the circumferential displacement of the circuit board 3 relative to the cover 2. The cover 2 is configured to be arranged opposite to the second surface 3b of the circuit board 3 on the opposite side of the first surface 3a, and covers the second surface 3b of the circuit board 3.

[0037] like Figure 4 As shown, the cover 2 has two openings 24, and the circuit board 3 has two through holes 34. As described later, in the motor device 1 of this embodiment, the other end of the conducting pin 84 fixed at one end to the coil 83 of the stator 8 passes through the through hole 34 of the circuit board 3 and is welded on the second surface 3b (the surface on the cover 2 side) of the circuit board 3. The opening 24 of the cover 2 is provided to effectively perform the welding operation of the conducting pin 84.

[0038] like Figure 3 As shown in FIG. 1 , 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 metal, for example, and the yoke 4 and the support portion 41 are joined by pressing the support portion 41. The support portion 41 is pressed by the force of the coil spring 53 provided between the support portion 41 and the bearing 52. Figure 3 The inner surface of the yoke 4 ( Figure 3 ) in the left direction.

[0039] 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 passes through the sleeve 9 and is supported by a bearing 51 and a bearing 52 at one end and the other end of the sleeve 9 in the axial direction, respectively.

[0040] like Figure 2 and Figure 4 As shown, the yoke 4 is substantially annular. A magnet 7 is pressed into the inner peripheral surface of the yoke 4 (see Figure 3 The magnet 7 is magnetized so that the N pole and the S pole are alternately arranged in the circumferential direction. The yoke 4 is made of a magnetic body and prevents the magnetic field formed by the magnet 7 from leaking to the outside of the magnet 7.

[0041] like Figure 3 As shown, the stator 8 is arranged to face the first surface 3 a 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 composed of a conductive wire wound around the stator core 81 via the insulating member 82 .

[0042] 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 in which the rotor is located radially outward of the stator 8 .

[0043] (2) Structure of stator 8 according to the embodiment

[0044] Next, refer to Figures 5 to 8 , the structure of the stator 8 is described in further detail.

[0045] Figure 5 It is an exploded perspective view of the stator 8 without the coil 83 . Figure 6 It is an enlarged front view of the first insulator 82A when viewed from the yoke 4 side in the axial direction. Figure 7 It is an enlarged front view of the second insulator 82B when viewed from the rotating body 6 side in the axial direction. Figure 8 It is an enlarged front view of the stator 8 (a view when viewed from the yoke 4 side).

[0046] Figure 5 The stator core 81, the insulating member 82 (the first insulator 82A and the second insulator 82B), and the conducting pin 84 are shown. The insulating member 82 is made of resin and is manufactured by, for example, injection molding.

[0047] like Figure 5 As shown, the stator core 81 is a plurality of magnetic steel plates arranged axially (in Figure 3 The stacked body formed by stacking and fixing the stator core 81 (in the left-right direction) has a plurality of teeth 811. In the example of this embodiment, the teeth 811 are arranged at 90-degree intervals along the circumferential direction of the stator core 81.

[0048] An inner hole 81h is formed in the center portion of the stator core 81. The inner peripheral surface 81a of the inner hole 81h is pressed into the outer peripheral surface of the sleeve 9 when the stator 8 is connected to the sleeve 9. That is, the stator core 81 is mounted on the sleeve 9 in such a manner that the inner peripheral surface 81a of the inner hole 81h of the stator core 81 contacts the outer peripheral surface of the sleeve 9.

[0049] like Figure 5 As shown, the insulating member 82 is made of an insulating material such as rubber or resin, and insulates the coil 83 from the teeth 811, and is composed of a first insulator 82A and a second insulator 82B that clamp the stator core 81 from both sides. The first insulator 82A and the second insulator 82B have an inner hole 82Ah and an inner hole 82Bh for inserting the sleeve 9.

[0050] like Figure 5 and Figure 6 As shown, the first insulator 82A has tooth cover portions 821A at intervals of 90 degrees along the circumferential direction of the inner hole 82Ah corresponding to the teeth 811 of the stator core 81. The first insulator 82A has an inner peripheral wall 823A extending axially at the periphery of the inner hole 82Ah. That is, the inner peripheral wall 823A extends axially on the side opposite to the side where the stator core 81 is provided, with the tooth cover portion 821A as a reference. The wall portion 822A extends axially on the side where the stator core 81 is provided, with the tooth cover portion 821A as a reference.

[0051] like Figure 5 and Figure 7 As shown, the second insulator 82B has a tooth cover portion 821B corresponding to the teeth 811 of the stator core 81 at intervals of 90 degrees along the circumferential direction of the inner hole 82Bh. The second insulator 82B has a cylindrical portion 823B extending axially at the periphery of the inner hole 82Bh. That is, the cylindrical portion 823B extends axially on the side opposite to the side where the stator core 81 is set, with the tooth cover portion 821B as a reference. The wall portion 822B extends axially on the side where the stator core 81 is set, with the tooth cover portion 821B as a reference.

[0052] As described above, the first insulator 82A and the second insulator 82B respectively include an inner peripheral wall 823A and a cylindrical portion 823B extending along the circumference of the inner hole 81h of the stator core 81 and along the axial direction of the sleeve 9 into which the stator 8 is pressed, and isolating the teeth 811 of the stator core 81 from the coil 83. The inner peripheral wall 823A and the cylindrical portion 823B are provided, so that the coil 83 and the teeth 811 are reliably insulated.

[0053] Refer again Figure 5 and Figure 6 A notch 823Ah is formed on the inner peripheral wall 823A of the first 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, thereby facilitating the press-fitting operation of the stator 8 to the sleeve 9. That is, the first insulator 82A has the notch 823Ah on the periphery of the inner hole 82Ah corresponding to the exposed surface of the stator core 81.

[0054] In addition, in the notch portion 823Ah, a protrusion 823Aj is provided from the inner peripheral wall 823A toward the radially outer side. The protrusion 823Aj is provided in order to reliably perform insulation between the coil 83 and the teeth 811 in the notch portion 823Ah.

[0055] Reference Figure 5 and Figure 7 The second insulator 82B has a cylindrical portion 824B extending in the axial direction and for the conduction pin 84 to pass through. The cylindrical portion 824B is supported by a wall portion 822B formed in the axial direction, thereby ensuring sufficient strength of the cylindrical portion 824B.

[0056] In addition, no notch portion is provided in the cylindrical portion 823B of the second insulator 82B.

[0057] After the stator core 81 is clamped from both sides by the first insulator 82A and the second insulator 82B, a conductive wire is wound around the tooth cover portion 821A, the teeth 811, and the tooth cover portion 821B to form the coil 83. Figure 8 The stator 8 is assembled as shown.

[0058] After the stator 8 is assembled, Figure 5 As shown, the conducting pin 84 is passed through the cylindrical portion 824B, and one end of the conducting pin 84 and one end of the coil 83 are welded together.

[0059] (3) Pressing of the stator 8 into the sleeve 9

[0060] Next, refer to Figure 8 to Figure 10 The press-fitting of the stator 8 into the sleeve 9 when assembling the motor device 1 according to the present embodiment will be described.

[0061] Fig. 9 This is a diagram showing the structure of the assembled state after the stator 8 is pressed into the sleeve 9 when the motor device 1 of the present embodiment is assembled, viewed from the first surface 3a side of the circuit board 3 in the axial direction. In addition, when the motor device 1 of the present embodiment is assembled, before the stator 8 is pressed into the sleeve 9, the circuit board 3 is in a state fixed to the cover 2. Fig.10 yes Fig. 9 An enlarged cross-sectional view of the structure in the assembled state.

[0062] like Fig.10 As shown, when the stator 8 is pressed into the sleeve 9, the process is as follows: the inner peripheral surface 81a of the inner hole 81h of the stator core 81 of the stator 8 is brought into contact with the outer peripheral surface 9a of the sleeve 9 along the axial direction (the pressing direction D from the first surface 3a toward the second surface 3b of the circuit board 3). When pressing, the cover 2 is fixed to the device, and the stator 8 is pressed in a predetermined amount along the pressing direction by a pressing jig.

[0063] In addition, as described above, when the stator 8 is pressed in, one end of the conducting pin 84 is welded to the coil 83, so the operator can avoid pressing the stator 8 in the wrong direction by confirming whether the end of the conducting pin 84 is welded.

[0064] In the present embodiment, when the stator 8 is press-fitted by the press-fitting jig, a portion of the stator core 81 is exposed. Therefore, by pressing the jig so as to contact the exposed surface of the stator core 81 , the stator 8 can be reliably press-fitted into the sleeve 9 .

[0065] More specifically, if Figure 8 As shown, the stator core 81 of the stator 8 has an exposed surface when viewed from one side of the pressing jig in the axial direction of the sleeve 9, so by making the press-fit jig contact with the exposed surface and pressing the sleeve 9 in the axial direction ( Figure 8 By pressing in the inner direction of the paper surface), the inner circumferential surface 81a of the inner hole 81h of the stator core 81 can be reliably pressed into the outer circumferential surface 9a of the sleeve 9.

[0066] Figure 8The exposed surface of the stator core 81 shown includes a peripheral region 811a along the periphery of the inner hole 81h of the stator core 81 in the surface of the stator core 81. The peripheral region 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 pressed into the sleeve 9, and the stator 8 can be pressed in more reliably by making the press-in jig contact with the peripheral region 811a.

[0067] As reference Figure 6 As described above, the inner peripheral wall 823A of the first insulator 82A is provided with a notch 823Ah. Therefore, after the first insulator 82A is assembled to the stator core 81, Figure 8 As shown, the protruding region 811p of the surface of the stator core 81 exposed by the notch 823Ah forms the exposed surface. 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.

[0068] Assume that if the inner peripheral wall 823A of the first insulator 82A is set at Figure 6 If the state shown is closer to the outside, the peripheral area 811a of the exposed surface can be expanded. Figure 3 As shown in FIG. 1 , the overall shape of the stator 8 cannot be enlarged to ensure a gap between the magnets 7, so enlarging the peripheral area 811a of the exposed surface sacrifices the radial dimensions of the coil 83 and the tooth 811, which affects the performance of the motor. Therefore, the notch 823Ah is partially provided along the circumferential direction on the inner peripheral wall 823A of the first insulator 82A, thereby forming a protruding area 811p of the exposed surface of the stator core 81. Therefore, it is possible to ensure an effective exposed area without affecting the performance of the motor.

[0069] In the example of the present embodiment, protruding regions 811p are formed at four locations of the exposed surface along the periphery of the inner hole 81h of the stator core 81. The press-in operation is performed by pressing the stator 8 in the press-in direction D using a press-in jig that simultaneously contacts the protruding regions 811p at the four locations of the exposed surface. Since the protruding regions 811p at the four locations are relatively close to the outer peripheral surface 9a of the sleeve 9, the stator 8 can be reliably pressed in.

[0070] In the example of this embodiment, the protruding areas 811p of the exposed surface of the stator core 81 are arranged at equal intervals along the circumferential direction of the inner hole 81h of the stator core 81. In this example, the protruding areas 811p of the exposed surface of the stator core 81 are arranged at equal intervals in the circumferential direction at four locations between adjacent teeth 811 of the stator core 81. That is, Figure 8In the embodiment, since the protruding region 811p is provided toward the portion where the coil 83 is not wound, the influence on the arrangement of the coil 83 in the stator 8 is small.

[0071] As reference Figure 6 As described above, the first insulator 82A has a protrusion 823Aj extending from the inner peripheral wall 823A toward the radially outer side in the notch portion 823Ah. Figure 8 As shown, the protrusion 823Aj of the first insulator 82A is configured to surround at least a portion of the protruding region 811p of the exposed surface of the stator core 81. Therefore, insulation between the teeth 811 and the coil 83 in the protruding region 811p can be reliably performed.

[0072] In addition, unlike the inner peripheral wall 823A of the first insulator 82A, no notch is provided in the cylindrical portion 823B of the second insulator 82B. Therefore, when the stator 8 is assembled and the stator 8 is observed from the second insulator 82B side, no protruding area protruding radially outward from the inner hole 81h is formed on the exposed surface of the stator core 81. That is, the protruding area is provided only on the surface of the stator core 81 on the first insulator 82A side in the axial direction of the sleeve 9, and is not provided on the surface of the stator core 81 on the second insulator 82B side in the axial direction of the sleeve 9. Therefore, by confirming the exposed surfaces of the stator core 81 on both sides of the stator 8, it is also possible to prevent the operator from erroneously assembling the stator 8 in the wrong direction when pressing the stator 8 into the sleeve 9.

[0073] (4) Sealing when the stator 8 is pressed into the sleeve 9

[0074] When the stator 8 is pressed into the sleeve 9, the inner circumferential surface of the stator 8 and the outer circumferential surface of the sleeve 9 may generate chips (cuttings) due to strong friction. In this case, the generated chips move to the circuit board 3 and adhere to it, which may cause a problem such as an electrical short circuit. Therefore, in the motor device 1 of this embodiment, it is configured to reliably seal between the stator 8 and the sleeve 9 as described below so that the chips that may be generated during the press-in will not move to the circuit board 3.

[0075] Below, refer to Figure 11 to Figure 14 The sealing when the stator 8 is press-fitted into the sleeve 9 will be described. Fig.11 This is a partial cross-sectional view of the motor device 1 according to the embodiment at the start of press-fitting in a process of press-fitting the stator 8 into the sleeve 9 . Fig.12 This is a partial cross-sectional view of the motor device 1 according to the embodiment, in the middle of the press-fitting process of the stator 8 into the sleeve 9 . Fig.13 yes Fig.12 AA section view. Fig.14It is a partial cross-sectional view of the motor device 1 according to the embodiment at the time of completing the press-fitting in the process of press-fitting the stator 8 into the sleeve 9 .

[0076] exist Fig.11 , Fig.12 as well as Fig.14 In each figure, (b) represents an enlarged view of part E in (a).

[0077] like Fig.11 As shown in FIG. 1 , the cylindrical portion 823B of the second insulator 82B extends from the stator core 81 toward the circuit board 3 along the outer peripheral surface of the sleeve 9. A protrusion 825B is formed at the end of the inner peripheral surface 823Bs of the cylindrical portion 823B. The protrusion 825B is provided for the purpose of sealing so that the chips generated during the pressing of the stator 8 into the sleeve 9 do not fall onto the circuit board 3.

[0078] As described above, the second insulator 82B is a resin component manufactured by injection molding, for example, and therefore the end portion of the inner peripheral surface 823Bs corresponds to a dividing surface of the mold. Fig.11 The burr Br is generated as shown.

[0079] like Fig.11 As shown in (b), the outer peripheral surface 9a of the sleeve 9 has a small diameter outer peripheral surface 9a1 continuously formed in the press-in direction, an outer peripheral surface 9a2 linearly expanded from the diameter of the outer peripheral surface 9a1, and a large diameter outer peripheral surface 9a3. In addition, a recessed portion 93d is provided on the outer peripheral surface 9a3 of the sleeve 9 over the entire circumference.

[0080] (4-1) Pressing start time

[0081] like Fig.11 As shown, the structure is such that, at the start of the press-in process when the stator 8 is pressed into the sleeve 9, the protrusion surface 825Bs of the protrusion 825B contacts the outer peripheral surface 9a3 of the sleeve 9. Fig.11 82Bs is in the downward direction of the second insulator 82B, so the protrusion surface 825Bs is in contact with the outer peripheral surface 9a3 during the entire press-fitting process. Therefore, it is possible to prevent the chips generated by the strong friction between the inner peripheral surface of the stator 8 and the outer peripheral surface of the sleeve 9 during the press-fitting process from moving from the gap between the inner peripheral surface 823Bs of the second insulator 82B and the outer peripheral surface 9a3 to the circuit board 3. That is, the space between the stator 8 and the sleeve 9 is sealed so that the chips do not move to the circuit board 3.

[0082] (4-2) Press in midway

[0083] Fig.12 Shows from Fig.11 The state of pressing. Fig.12 In the state, Fig.11Compared with the state of , the second insulator 82B moves downward relative to the sleeve 9.

[0084] like Fig.12 As shown in (b), in this state, the protrusion 825B is located on the outer peripheral surface 9a3, but since the burr Br is formed on the protrusion surface 825Bs, the protrusion surface 825Bs becomes a state of floating from the outer peripheral surface 9a3. Fig.13 As shown, a gap is generated between the protrusion surface 825Bs and the outer peripheral surface 9a3, and the sealing between the stator 8 and the sleeve 9 is incomplete.

[0085] (4-3) Pressing end time

[0086] At the end of the press, if Fig.12 As shown in the figure, a recessed portion 93d is provided on the outer peripheral surface 9a3 of the sleeve 9 at a position opposite to the protrusion 825B. Therefore, the burr Br formed on the protrusion surface 825Bs of the protrusion 825B is accommodated in the recessed portion 93d, and the protrusion surface 825Bs is in contact with the outer peripheral surface 9a3 without a gap. Therefore, when the stator 8 is pressed 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, so that the reliability of the motor device 1 is not affected.

[0087] (5) Application Examples of the Motor Device 1 of the Embodiment

[0088] Next, as an application example of the motor device 1 of the present embodiment described above, refer to Fig.15 A vehicle headlamp on which the motor device 1 according to the present embodiment can be mounted will be described in outline. Fig.15 It is a horizontal cross-sectional view of a vehicle headlamp. Fig.15 The vehicle headlamp 10 shown is a left-side headlamp mounted on the left side of the front end of the vehicle, and has the same structure as the headlamp mounted on the right side except that it is bilaterally symmetrical. Therefore, the left-side vehicle headlamp 10 is described in detail below, and the description of the right-side vehicle headlamp is omitted.

[0089] like Fig.15 As shown, the vehicle headlamp 10 includes a lamp body 12 having a recessed portion opened toward the front. The front opening of the lamp body 12 is covered by a transparent front cover 14 to form a lamp chamber 16. The lamp chamber 16 functions as a space for accommodating a lamp unit 18.

[0090] The lamp unit 18 is a unit that adopts the ADB (Adaptive Driving Beam) technology of the blade scanning method, and is configured to irradiate the 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 uses a convex lens, for example. The shape of the convex lens can be appropriately selected according to the required light distribution pattern or illumination distribution and other light distribution characteristics, and an aspherical lens or a free-form surface lens can be used. In addition, an extended reflector 23 is provided around the projection lens 27.

[0091] The rotating reflector 60 is configured to reflect the light emitted from the light source 26 while rotating the blade 60b in one direction around the rotation axis R by the motor 30 as a driving source, and form a light distribution pattern by scanning the reflected light. In addition, the blade 60b has an annular reflection area 60a, and the annular reflection area 60a is configured to reflect the light emitted from the light source 26 while rotating, so as to form a desired light distribution pattern.

[0092] The shape of the blade 60b of the rotating reflector 60 is configured so that the secondary light source of the light source 26 based on the reflection is formed near the focus of the projection lens 27. In addition, the blade 60b has a twisted shape so that the angle between the optical axis Ax and the reflecting surface changes as it moves toward the circumferential direction centered on the rotation axis R. Thus, scanning using the light from the light source 26 (light source image) can be performed.

[0093] The light source 26 is preferably a light source that can be controlled to turn on and off in a short time, and is preferably a semiconductor light emitting element such as an LED, LD, or EL element.

[0094] The motor 30 is mounted on the substrate 92. The substrate 92 is mounted and fixed on the mounting surface 94a of the heat sink 94. When the substrate 92 is mounted on the mounting surface 94a, the rotation axis R of the rotating reflector 60 is inclined with respect to the optical axis Ax or the vehicle front direction.

[0095] The light source 26 is mounted on a substrate 36. In addition, a lens 38 as a primary optical system is provided in the light emitting direction of the light source 26 and between the light source 26 and the rotating reflector 60. The lens 38 converges the emitted light of the light source 26 so that the light emitted from the light source 26 is directed toward the reflection area 60a of the rotating reflector 60. The substrate 36 is mounted on a heat sink 40. The heat sink 94 and the heat sink 40 are fixed to a metal plate-shaped support member 42. Furthermore, the lamp unit 18 is supported via the support member 42 so as to be freely tiltable relative to the lamp body 12 by a unit using an adjustment screw 44 and a nut 46.

[0096] The control circuit 48 is connected to the light source 26 and the motor 30 via the respective substrates, and transmits a signal for controlling the light source 26 or the motor 30 and receives a signal output from the motor 30 .

[0097] 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.

[0098] Although the embodiments of the motor device of the present invention have been described in detail above, the scope of the present invention is not limited to the above embodiments. In addition, the above embodiments can be variously improved and modified within the scope not departing from the gist of the present invention.

Claims

1. A motor device, comprising: a cylindrical member; and The stator comprises a stator core, an insulating member and a coil, wherein the stator core has an inner hole, the insulating member is mounted on the stator core, and the coil is composed of a conducting wire wound on the stator core via the insulating member. The stator core is mounted on the cylindrical member in such a manner that the inner peripheral surface of the stator core contacts the outer peripheral surface of the cylindrical member. The insulating member has a cylindrical portion extending from the stator core along the outer peripheral surface of the cylindrical member. A protrusion that contacts the outer peripheral surface of the cylindrical member is formed in a cylindrical shape at the end of the inner peripheral surface of the cylindrical portion. A recessed portion is provided on the outer peripheral surface of the cylindrical member over the entire circumference at a position facing the end of the protrusion.

2. The motor device according to claim 1, wherein: The cylindrical member and the stator core are mounted together by press-fitting. The cylindrical member and the stator core are configured such that the protrusion contacts the outer peripheral surface of the cylindrical member when press-fitting starts.

3. The motor device according to claim 1 or 2, wherein: The insulating member is made of resin.

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