Motor

Abstract

To provide a motor with which, while suppressing an increase in component counts, it is possible to prevent entry of water to the inside of a case, to prevent the leakage of a cooling air taken in from a motor holder, and to prevent propagation of vibration of a stator to the holder.SOLUTION: A motor (10) comprises: a stator (12); a center piece (16) that supports the stator; a case (22) which is fixed to the center piece by a first fixing part (60); a motor holder (28) which is fixed to the case by a second fixing part (62); and an elastic member (30) which is provided in the case. The elastic member includes, integrally, a first seal part (74) that seals between the center piece and the case, a second seal part (76) that seals between the case and the motor holder, and a vibration-proof part (78) which is provided in a vibration transmission path (50) connecting the first fixing part and the second fixing part together.SELECTED DRAWING: Figure 11

Description

[Technical field]

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

[0002] Patent document 1 discloses a motor comprising a stator having a center piece, a motor holder fixed to the center piece, a case fixed to the motor holder, and vibration-damping material provided between the center piece and the motor holder. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6560655 Summary of the Invention [Problem to be solved by the invention]

[0004] The motor described above is equipped with vibration-proofing material to prevent the vibration of the stator from being transmitted to the motor holder, but no measures are taken to prevent water from entering the inside of the case or to prevent the cooling air taken in from the motor holder from leaking. Furthermore, if such measures are taken, it is desirable to not increase the number of parts.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a motor that can prevent water from entering the inside of the case, prevent the cooling air taken in from the motor holder from leaking, and prevent vibrations of the stator from being transmitted to the motor holder, all while minimizing an increase in the number of parts. [Means for solving the problem]

[0006] One aspect of the present disclosure is a motor (10) comprising a stator (12), a center piece (16) supporting the stator, a case (22) fixed to the center piece by a first fixing portion (60), a motor holder (28) fixed to the case by a second fixing portion (62), and an elastic member (30) provided on the case, wherein the elastic member integrally has a first sealing portion (74) that seals between the center piece and the case, a second sealing portion (76) that seals between the case and the motor holder, and a vibration-proof portion (78) provided on a vibration transmission path (50) connecting the first fixing portion and the second fixing portion. Effect of the Invention

[0007] According to the present disclosure, a motor is provided that can prevent water from entering the inside of the case, prevent the cooling air taken in from the motor holder from leaking, and prevent vibrations of the stator from being transmitted to the motor holder, all while minimizing an increase in the number of parts. [Brief description of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view of a motor according to an embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] This is a perspective view of the case as seen from the back side. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 2 is a perspective view of a motor including a cross section. [Figure 10] FIG. 2 is a perspective view of a motor including a cross section. [Figure 11] FIG. 2 is a perspective view of a motor including a cross section. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, one embodiment of the present disclosure will be described.

[0010] 1 to 3, the motor 10 includes a stator 12, a rotor 14, a center piece 16, a pair of ball bearings 18, a shaft 20, a case 22, a substrate 24, a connector member 26, a motor holder 28, and an elastic member 30. The motor 10 is, as an example, an outer rotor type brushless motor.

[0011] Arrow A indicates one axial side of motor 10, and arrow B indicates the other axial side of motor 10. The axial direction of motor 10 coincides with the axial directions of each member arranged coaxially with shaft 20. Hereinafter, one axial side of each member will be referred to as "side A," and the other axial side of each member will be referred to as "side B."

[0012] The stator 12 is formed in an annular shape and includes a stator core 32, an insulator 34, and a winding 36. The winding 36 is wound around the stator core 32 with the insulator 34 interposed therebetween.

[0013] The rotor 14 has a rotor housing 38 and a rotor magnet 40. The rotor housing 38 is formed in a cylindrical shape with a top. The rotor magnet 40 is fixed to the inner circumferential surface of the rotor housing 38. The stator 12 is disposed inside the rotor housing 38. The rotor magnet 40 is disposed radially outside the stator 12 and faces the stator 12.

[0014] The center piece 16 has a plate-shaped portion 42 and an axial core portion 44. The plate-shaped portion 42 is formed in a plate shape and is disposed with the axial direction of the motor 10 as the plate thickness direction. The axial core portion 44 protrudes from the plate-shaped portion 42 to the A side. The axial core portion 44 is disposed coaxially with the central axis of the motor 10. The plate-shaped portion 42 and the axial core portion 44 may be formed integrally or separately. The axial core portion 44 is press-fitted into the inside of the stator core 32, so that the stator 12 is supported by the axial core portion 44. A through hole 44A is formed in the center of the axial core portion 44, penetrating in the axial direction of the motor 10. In addition, recesses 44B are formed at the end portion on the A side and the end portion on the B side of the axial core portion 44.

[0015] Each ball bearing 18 is housed in the recess 44B. Each ball bearing 18 has an outer ring 18A, a plurality of balls 18B, and an inner ring 18C. The outer ring 18A is press-fitted into the inside of the shaft core portion 44, whereby each ball bearing 18 is held in the shaft core portion 44. The inner ring 18C is rotatably supported by the outer ring 18A via the plurality of balls 18B.

[0016] The shaft 20 is formed in a rod shape and made of iron. The shaft 20 extends along the axial direction of the motor 10 and is disposed on the central axis of the motor 10. The shaft 20 is inserted into the through hole 44A. The shaft 20 is press-fitted into the inner ring 18C of each ball bearing 18, and is rotatably supported by the center piece 16 via each ball bearing 18. A rotor housing 38 is fixed to the shaft 20 so as to be integrally rotatable. An end portion on the A side of the shaft 20 is formed as a fixing portion 20A for fixing a rotating member such as a fan. The fixing portion 20A protrudes from the rotor housing 38 to the arrow A side.

[0017] The case 22 is disposed on the B side of the plate-shaped portion 42. The case 22 has a cylindrical portion 46, a cover portion 48, and a flange portion 50. The cylindrical portion 46 is provided on the central axis of the motor 10. The cylindrical portion 46 is formed in a shape in which a part of the case 22 extends cylindrically to the A side. The B side portion of the shaft 20 is inserted into the inside of the cylindrical portion 46.

[0018] The cover portion 48 is formed around the cylindrical portion 46. The cover portion 48 is formed in a plate shape and is disposed with the axial direction of the motor 10 as the plate thickness direction. The cover portion 48 is disposed facing the plate portion 42 on the B side of the plate portion 42. The cover portion 48 covers the plate portion 42 from the B side relative to the center piece 16 (i.e., the side opposite the fixed portion relative to the center piece 16). A space for accommodating the substrate 24 described below is formed between the plate portion 42 and the cover portion 48. The entire case 22 including the cover portion 48 is formed of resin.

[0019] The flange portion 50 is formed around the cover portion 48. The flange portion 50 expands from the outer periphery of the cover portion 48 toward the outer periphery of the case 22. The flange portion 50 is disposed on the B side of the plate-shaped portion 42, and faces the plate-shaped portion 42 in the axial direction of the motor 10.

[0020] The substrate 24 is formed in a plate shape and is disposed with the axial direction of the motor 10 as the plate thickness direction. The substrate 24 is fixed to the plate-shaped portion 42 with screws or the like, and is thereby provided on the plate-shaped portion 42. Electronic components and the like for supplying current to the windings 36 are mounted on the substrate 24. The portion of the shaft 20 on side B penetrates the substrate 24 and the above-mentioned plate-shaped portion 42. The connector member 26 has a plurality of connection terminals (not shown). Each connection terminal is connected to the substrate 24.

[0021] The motor holder 28 has a first annular portion 52, a second annular portion 54, and a plurality of mounting portions 56. The first annular portion 52 is located on the A side of the plate-shaped portion 42 and surrounds the rotor 14. The second annular portion 54 is located on the B side of the first annular portion 52 and surrounds the plate-shaped portion 42. The second annular portion 54 faces the flange portion 50 in the axial direction of the motor 10. The plurality of mounting portions 56 are formed on the outer periphery of the motor holder 28. The plurality of mounting portions 56 are attached to an object to which the motor 10 is to be attached, thereby fixing the motor 10 to the object to which the motor 10 is to be attached.

[0022] The motor holder 28 is formed with an intake portion 58 that extends radially outward of the motor 10. The intake portion 58 has an intake port 58A and an intake passage 58B for taking in cooling air. The intake port 58A opens toward the A side, and the intake passage 58B extends radially of the motor 10 and communicates with the intake port 58A and the inside of the rotor housing 38. The cooling air taken in from the intake port 58A is supplied to the inside of the rotor housing 38 through the intake passage 58B, whereby the stator 12 is cooled by the cooling air.

[0023] As shown in FIG. 3, the case 22 is fixed to the center piece 16 by a plurality of first fixing portions 60, and the motor holder 28 is fixed to the case 22 by a plurality of second fixing portions 62.

[0024] The first fixing portion 60 is composed of an extension portion 64 (see FIG. 4) extending from the flange portion 50 of the case 22 to the A side, and a protruding portion 66 (see FIG. 3) protruding from the outer periphery of the base portion 72 in the radial direction of the motor 10. A claw portion 64A is formed at the end of the extension portion 64 on the A side, and a through hole 66A is formed in the protruding portion 66, penetrating in the axial direction of the motor 10. Then, as described later, with the first seal portion 74 interposed between the plate-shaped portion 42 and the flange portion 50 (see FIGS. 9 and 10), the extension portion 64 is inserted into the through hole 66A from the B side, and the claw portion 64A is engaged with the peripheral portion of the through hole 66A on the A side, thereby fixing the case 22 to the center piece 16.

[0025] The second fixing portion 62 is composed of a locking hole 68 (see FIG. 4) formed in the outer periphery of the case 22 and a locking portion 70 (see FIGS. 3 and 5) formed in the second annular portion 54 of the motor holder 28. The locking hole 68 is formed by a through hole that penetrates the motor 10 in the radial direction. The locking portion 70 is formed by a claw portion that protrudes radially outward from the second annular portion 54. As will be described later, with the second seal portion 76 interposed between the second annular portion 54 and the flange portion 50 (see FIGS. 9 and 10), the locking portion 70 is locked to the edge portion on side A of the locking hole 68, thereby fixing the motor holder 28 to the case 22.

[0026] 4 and 6 to 11, the elastic member 30 integrally includes a base portion 72, a first seal portion 74, a second seal portion 76, and a vibration-proof portion 78. The elastic member 30 may be made of, for example, rubber or elastomer. The elastic member 30 may be molded integrally with the case 22 or may be molded separately.

[0027] The base portion 72, the first seal portion 74, and the second seal portion 76 are formed in an annular shape and extend in the circumferential direction of the case 22 (see FIG. 4). The base portion 72 is formed in a plate shape with the plate thickness direction being the axial direction of the case 22, and is provided on the surface of the flange portion 50 on the B side. The first seal portion 74 and the second seal portion 76 are formed as protrusions protruding from the base portion 72 to the B side. The first seal portion 74 is disposed radially inward of the case 22 with respect to the second seal portion 76 and the multiple first fixing portions 60. The second seal portion 76 is disposed radially outward of the case 22 with respect to the multiple first fixing portions 60.

[0028] The first seal portion 74 is interposed between the plate portion 42 and the flange portion 50 in an elastically compressed state when the case 22 is fixed to the center piece 16 by the multiple first fixing portions 60, thereby sealing the gap between the plate portion 42 and the flange portion 50 (see FIGS. 9 and 10). The gap between the plate portion 42 and the flange portion 50 is sealed by the first seal portion 74, thereby ensuring waterproof performance that prevents water (see arrow a in FIG. 9) from entering the inside of the case 22.

[0029] The second seal portion 76 is interposed between the second annular portion 54 and the flange portion 50 in an elastically compressed state when the motor holder 28 is fixed to the case 22 by the multiple second fixing portions 62, thereby sealing the gap between the second annular portion 54 and the flange portion 50 (see FIGS. 9 and 10). The gap between the second annular portion 54 and the flange portion 50 is sealed by the second seal portion 76, thereby ensuring a leak-proof performance that prevents a portion of the cooling air (see arrow b in FIG. 10) supplied to the inside of the rotor housing 38 through the intake passage 58B from leaking between the motor holder 28 and the case 22.

[0030] The vibration-proofing portion 78 is provided on the flange portion 50, which is a vibration transmission path that connects the first fixed portion 60 and the second fixed portion 62. Providing the vibration-proofing portion 78 on the flange portion 50 ensures vibration-proofing performance that prevents vibrations of the stator 12 (see arrow c in FIG. 11) from being transmitted to the motor holder 28 through the flange portion 50. In addition, the motor holder 28 described above is not directly supported by the center piece 16, but is indirectly supported by the center piece 16 via the case 22 and the elastic member 30. In other words, the motor holder 28 is in a floating state relative to the center piece 16 due to the floating structure.

[0031] The vibration-proofing portion 78 extends in the circumferential direction of the case 22 (see FIG. 7). The vibration-proofing portion 78 also extends from the base portion 72 to the A side (see FIGS. 9 to 11). The flange portion 50 is formed with a slit 80 having the same shape as the vibration-proofing portion 78, and the slit 80 penetrates the case 22 in the axial direction. The vibration-proofing portion 78 is accommodated in the slit 80. By being accommodated in the slit 80, the vibration-proofing portion 78 is formed as a through portion 82 that penetrates the case 22 in the axial direction of the case 22 in its entirety. Note that a portion of the vibration-proofing portion 78 does not have to penetrate the case 22.

[0032] As shown in Figs. 7 and 8, the vibration-proof part 78 has a zigzag part 84 extending in a zigzag pattern. When viewed from the axial direction of the case 22, the zigzag part 84 has an extension part 84A extending in the radial direction of the case 22 and an intersection part 84B extending in a direction intersecting the radial direction of the case 22 (for example, a direction perpendicular to the radial direction of the case 22, that is, the circumferential direction of the case 22). The vibration-proof part 78 also has an enclosing part 86 that encloses the first fixed part 60. Furthermore, the vibration-proof part 78 has a traversing part 87 that traverses between the first fixed part 60 and the second fixed part 62. The traversing part 87 may have a zigzag shape, a maze shape, or a branch shape.

[0033] More specifically, the vibration-proof section 78 has a first vibration-proof section 88 indicated by a thick dot and a second vibration-proof section 90 indicated by a thin dot. The first vibration-proof section 88 and the second vibration-proof section 90 both extend in the circumferential direction of the case 22. The first vibration-proof section 88 and the second vibration-proof section 90 are independent of each other, and the first vibration-proof section 88 and the second vibration-proof section 90 have a range R where they overlap in the circumferential direction of the case 22.

[0034] A portion of the flange portion 50 radially inward of the first vibration-isolating portion 88 (hereinafter also referred to as the "inner portion 92") and a portion of the flange portion 50 radially outward of the first vibration-isolating portion 88 (hereinafter also referred to as the "outer portion 94") are connected in a range R. That is, in the range R, connecting portions 96A and 9B that connect the inner portion 92 and the outer portion 94 are formed. The connecting portion 96A extends in the radial direction of the case 22, and the connecting portion 9B connects the connecting portions 96A to each other.

[0035] It should be noted that the shape of the elastic member 30 described above is merely one example, and various modifications are possible.

[0036] Next, the effects of this embodiment will be described.

[0037] As described above in detail, the motor 10 according to this embodiment includes the stator 12, the center piece 16 that supports the stator 12, the case 22 fixed to the center piece 16 by the first fixing portion 60, the motor holder 28 fixed to the case 22 by the second fixing portion 62, and the elastic member 30 provided on the case 22. The elastic member 30 integrally includes a first seal portion 74 that seals between the center piece 16 and the case 22, a second seal portion 76 that seals between the case 22 and the motor holder 28, and a vibration-proof portion 78 provided on the flange portion 50, which is a vibration transmission path that connects the first fixed portion 60 and the second fixed portion 62.

[0038] Therefore, the first seal portion 74 can prevent water from entering the inside of the case 22, the second seal portion 76 can prevent the cooling air taken in from the motor holder 28 from leaking, and the vibration-proof portion 78 can prevent vibrations of the stator 12 from being transmitted to the motor holder 28 through the flange portion 50. Moreover, an increase in the number of parts can be suppressed compared to when the first seal portion 74, the second seal portion 76, and the vibration-proof portion 78 are configured separately.

[0039] Moreover, the vibration-isolating portion 78 has a zigzag portion 84 that extends in a zigzag pattern. Therefore, for example, compared to when the vibration-isolating portion 78 extends in a straight line, the range in which the vibration-isolating portion 78 extends can be expanded, and the vibration-isolating performance can be improved.

[0040] Furthermore, the vibration-proof portion 78 has a through-portion 82 that passes through the case 22 in the axial direction of the case 22. Therefore, vibrations can be absorbed along the entire axial direction of the case 22.

[0041] Furthermore, the vibration-proof portion 78 has an intersection portion 84B that intersects with the radial direction of the case 22 when viewed from the axial direction of the case 22. Therefore, vibrations transmitted in the radial direction of the case 22 can be efficiently absorbed by the intersection portion 84B.

[0042] Further, the vibration-proofing portion 78 has a first vibration-proofing portion 88 extending in the circumferential direction of the case 22 and a second vibration-proofing portion 90 extending in the circumferential direction of the case 22, and the first vibration-proofing portion 88 and the second vibration-proofing portion 90 have a range R in which they overlap in the circumferential direction of the case 22. A portion of the case 22 that is radially inward from the first vibration-proofing portion 88 (i.e., an inner portion 92) and a portion of the case 22 that is radially outward from the first vibration-proofing portion 88 (i.e., an outer portion 94) are connected by a connecting portion 96A and a connecting portion 96B in the range R. Therefore, since the inner portion 92 and the outer portion 94 are configured to be integrally connected, an increase in the number of parts can be suppressed compared to a structure in which the inner portion 92 and the outer portion 94 are configured separately.

[0043] In addition, the motor holder 28 is not directly supported by the center piece 16, but is supported by the center piece 16 via the case 22 and the elastic member 30. Therefore, it is possible to prevent vibrations of the stator 12 from being directly transmitted from the center piece 16 to the motor holder 28.

[0044] While one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above, and it goes without saying that the present disclosure can be implemented in various modified forms without departing from the spirit and scope of the present disclosure.

[0045] With respect to the present disclosure, the following notes are disclosed. (Appendix 1) A stator (12); A center piece (16) supporting the stator; a case (22) fixed to the center piece by a first fixing portion (60); a motor holder (28) fixed to the case by a second fixing portion (62); An elastic member (30) provided in the case; Equipped with The elastic member is a first seal portion (74) for sealing between the center piece and the case; a second seal portion (76) that seals between the case and the motor holder; a vibration isolating portion (78) provided in a vibration transmission path (50) connecting the first fixed portion and the second fixed portion; Integral to the Motor (10). (Appendix 2) The vibration-proof portion has a zigzag portion (84) extending in a zigzag shape. 2. The motor according to claim 1. (Appendix 3) The vibration-proof portion has a through-portion (82) that passes through the case in the axial direction of the case. 3. The motor according to claim 1 or 2. (Appendix 4) The vibration-proof portion has an intersection portion (84B) that intersects with the radial direction of the case when viewed from the axial direction of the case. 4. The motor according to claim 1, (Appendix 5) The vibration-proof portion has a crossing portion (87) that crosses between the first fixed portion and the second fixed portion. 5. The motor according to claim 1 , (Appendix 6) The vibration isolating portion is a first vibration-isolating portion (88) extending in a circumferential direction of the case; a second vibration-isolating portion (90) extending in a circumferential direction of the case; having The first vibration isolating portion and the second vibration isolating portion have an overlapping range (R) in a circumferential direction of the case, A portion (92) of the case that is radially inner than the first vibration-isolating portion and a portion (94) of the case that is radially outer than the first vibration-isolating portion are connected within the range. 6. The motor according to claim 1 , (Appendix 7) the motor holder is supported by the center piece via the case and the elastic member; 7. The motor according to any one of claims 1 to 6. [Explanation of symbols]

[0046] 10...motor, 12...stator, 14...rotor, 16...center piece, 18...ball bearing, 20...shaft, 22...case, 24...board, 26...connector member, 28...motor holder, 30...elastic member, 32...stator core, 34...insulator, 36...winding, 38...rotor housing, 40...rotor magnet, 42...plate-shaped portion, 44...shaft core portion, 46...cylindrical portion, 48...cover portion, 50...flange portion, 52...first annular portion, 54...second annular portion , 56...mounting portion, 58...take-in portion, 60...first fixing portion, 62...second fixing portion, 64...extending portion, 66...protruding portion, 68...engaging hole, 70...engaging portion, 72...base portion, 74...first sealing portion, 76...second sealing portion, 78...vibration-proof portion, 80...slit, 82...penetrating portion, 84...zigzag portion, 84A...extending portion, 84B...intersecting portion, 86...enclosure portion, 87...crossing portion, 88...first vibration-proof portion, 90...second vibration-proof portion, 92...inner portion, 94...outer portion, 96A...connecting portion, 96B...connecting portion

Claims

1. A stator (12); A center piece (16) supporting the stator; a case (22) fixed to the center piece by a first fixing portion (60); a motor holder (28) fixed to the case by a second fixing portion (62); An elastic member (30) provided on the case; Equipped with The elastic member is a first seal portion (74) for sealing between the center piece and the case; a second seal portion (76) that seals between the case and the motor holder; a vibration isolating portion (78) provided in a vibration transmission path (50) connecting the first fixed portion and the second fixed portion; Integral to the Motor (10).

2. The vibration-proof portion has a zigzag portion (84) extending in a zigzag shape.

2. The motor according to claim 1.

3. The vibration-proof portion has a through-portion (82) that passes through the case in the axial direction of the case.

2. The motor according to claim 1.

4. The vibration-proof portion has an intersection portion (84B) that intersects with the radial direction of the case when viewed from the axial direction of the case, 2. The motor according to claim 1.

5. The vibration-proof portion has a crossing portion (87) that crosses between the first fixed portion and the second fixed portion.

2. The motor according to claim 1.

6. The vibration isolating portion is A first vibration isolating portion (88) extending in a circumferential direction of the case; A second vibration isolating portion (90) extending in a circumferential direction of the case; having The first vibration isolating portion and the second vibration isolating portion have an overlapping range (R) in a circumferential direction of the case, A portion (92) of the case that is radially inner than the first vibration-isolating portion and a portion (94) of the case that is radially outer than the first vibration-isolating portion are connected in the range.

2. The motor according to claim 1.

7. the motor holder is supported by the center piece via the case and the elastic member; 2. The motor according to claim 1.

Images