JP2011166855A - Brushless motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brushless motor having improved vibration resistance. <P>SOLUTION: A plurality of outer circumferential protrusions 52 each protruding from an outer periphery 40A of a cylindrical part 40 to the outside of a diameter direction are formed on a center piece 24, and a plurality of first inner circumferential protrusions 56 each protruding from the inner periphery 54A of a core body 54 to the inside of a diameter direction and formed on the center of a pair of adjacent outer circumferential protrusions 52 are formed on a stator 18. Vibration resistance members 26 are each disposed in a diameter direction between the cylindrical part 40 and the core body 54 and between the pair of adjacent outer circumferential protrusions 52. The vibration resistance members 26 each have an arc-like outer periphery 26A facing the inner periphery 54A of the core body 54; a pair of circumferential ends 62 formed on both sides of the outer periphery 26A and engaged in the circumferential direction of the outer circumferential protrusions 52 and the stator 18; and a first outer circumferential recess 64 formed on the outer periphery 26A and engaged in the circumferential direction of the first inner circumferential protrusion 56 and the stator 18. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a brushless motor.

  Patent Document 1 discloses a brushless motor provided with a vibration isolating member formed in an annular shape along the circumferential direction of the stator. In this brushless motor, the vibration isolating member is engaged with the outer peripheral convex portion formed on the center piece and the inner peripheral concave portion, and the first inner peripheral convex portion and the second inner peripheral convex portion formed on the stator. A first outer peripheral recess and a second outer peripheral recess are formed.

JP 2008-259407 A (see FIG. 8)

  However, in the brushless motor described in Patent Document 1, the vibration isolating member has a first outer peripheral recess and a second outer peripheral recess formed between a pair of adjacent inner peripheral recesses. Therefore, in this vibration isolating member, there is a possibility that the volume of the buffer portion formed between the inner peripheral concave portion and the first outer peripheral concave portion or the second outer peripheral concave portion is insufficient. Therefore, there is room for improvement in order to improve the vibration isolation performance.

  Further, in such a brushless motor having a structure that includes a vibration isolating member between the stator and the center piece and elastically supports the stator with respect to the center piece, it is desirable that the balance of the stator with respect to the center piece is maintained. It is.

  This invention is made | formed in view of the said subject, The objective is to provide the brushless motor which can improve a vibration proof performance.

  Another object of the present invention is to provide a brushless motor capable of maintaining the balance of the stator with respect to the center piece.

  In order to solve the above-mentioned problem, the brushless motor according to claim 1 includes a rotary shaft member, a rotor supported by the rotary shaft member, a cylindrical support portion that supports the rotary shaft member, and the cylindrical support. A center piece having a plurality of outer peripheral convex portions projecting radially outward from the portion, and a pair of adjacent annular projections radially inward from the inner peripheral portion, each of which is annularly formed radially outward of the cylindrical support portion. And a stator having a plurality of inner peripheral protrusions formed at the center of the outer peripheral protrusion, and between the adjacent outer peripheral protrusions between the radial directions of the stator and the cylindrical support part, respectively. And an arcuate outer peripheral portion that is formed of an elastic body and faces the inner peripheral portion of the stator, and is formed on both sides in the circumferential direction of the outer peripheral portion, and at least a part of the periphery of the outer peripheral convex portion and the stator. A plurality of vibration-proof members having a pair of circumferential end portions that are locked in the direction, and an outer peripheral recessed portion that is formed on the outer peripheral portion and is locked in the circumferential direction of the stator. Yes.

  According to this brushless motor, a plurality of vibration isolating members are arranged between the stator and the center piece. And the outer periphery recessed part formed in each anti-vibration member is latched in the circumferential direction of the inner peripheral convex part and stator which were formed in the stator, and at least one part of the circumferential direction edge part formed in this each anti-vibration member Are locked in the circumferential direction of the outer peripheral convex part formed in the center piece and the stator. Therefore, even when vibration is generated in the stator, this vibration is absorbed by the vibration isolating member, so that the vibration can be suppressed from being transmitted to the center piece.

  Here, the inner peripheral convex portion of the stator is formed at the center portion of a pair of adjacent outer peripheral convex portions, and the outer peripheral concave portion of the vibration isolating member locked to the inner peripheral convex portion is the periphery of the outer peripheral portion of the vibration isolating member. It is formed at the center of the direction. Therefore, in this vibration isolating member, the volume of the buffer portion formed between the outer peripheral recess and the circumferential end can be increased as compared with the conventional one, so that the vibration isolating performance can be improved.

  A brushless motor according to a second aspect of the present invention is the brushless motor according to the first aspect, wherein the outer peripheral convex portion has a main locking portion and a sub locking portion formed so as to be shifted from each other in the radial direction of the stator. The circumferential end is formed to be spaced apart in the circumferential direction of the main locking portion and the main locked portion locked in the circumferential direction of the stator, the sub locking portion and the stator, and In a state where the load acting on the vibration isolating member from the stator is not less than a value assumed in advance, the sub locking portion and the sub locked portion locked in the circumferential direction of the stator, Has been.

  According to this brushless motor, in a state where the load acting on the vibration isolating member from the stator is less than a value assumed in advance (low load state), the secondary locking portion of the outer peripheral convex portion and the secondary cover of the vibration isolating member are The locking portions are spaced apart from each other in the circumferential direction of the stator, and the main locking portion of the outer peripheral convex portion and the main locked portion of the vibration isolating member are locked in the circumferential direction of the stator. Therefore, in this state, since the spring constant of the vibration isolating member becomes low, low frequency vibration is absorbed by the vibration isolating member.

  On the other hand, in a state where the load acting on the vibration isolation member from the stator is greater than or equal to a value assumed in advance (high load state), the main locking portion of the outer peripheral convex portion and the main locked portion of the vibration isolation member are In addition to being locked in the circumferential direction of the stator, the secondary locking portion of the outer peripheral convex portion and the secondary locked portion of the vibration isolating member are locked in the circumferential direction of the stator. Therefore, in this state, since the spring constant of the vibration isolating member is increased, high frequency vibration is absorbed by the vibration isolating member.

  In this way, by changing the spring constant of the vibration isolating member in accordance with the load acting on the vibration isolating member from the stator, vibration can be effectively absorbed over a wider rotational speed region.

  The brushless motor according to a third aspect is the brushless motor according to the first or second aspect, wherein the stator has a plurality of first inner peripheral convex portions as the plurality of inner peripheral convex portions and radial directions from the inner peripheral portions, respectively. A plurality of second inner peripheral protrusions protruding inward and extending along the circumferential direction of the stator between the adjacent first inner peripheral protrusions and the outer peripheral protrusions, and the vibration isolating member Is a first outer peripheral recess as the outer peripheral recess, and a second outer periphery formed in the outer peripheral portion and locked in the axial direction of the second inner peripheral convex portion and the stator over the extending direction of the second inner peripheral convex portion. It is set as the structure which has a recessed part.

  According to this brushless motor, the second inner peripheral convex portion formed on the stator extends along the circumferential direction of the stator, and the second outer peripheral concave portion formed on the vibration isolating member extends from the second inner peripheral convex portion. The second inner circumferential convex portion and the stator are locked in the axial direction over the existing direction. Therefore, since the locking surface (receiving surface) between the stator and the vibration isolating member is enlarged, the positional accuracy and holding strength of the stator with respect to the center piece can be improved. Thereby, the balance of the stator with respect to the center piece can be maintained.

  A brushless motor according to a fourth aspect of the present invention is the brushless motor according to the third aspect, wherein a protrusion that protrudes radially inward of the stator is formed on the first inner peripheral protrusion, and the first outer peripheral recess The protrusion and the groove locked in the axial direction of the stator are formed.

  According to this brushless motor, the first inner circumferential convex portion and the first outer circumferential concave portion are each formed with a protruding portion and a groove portion that are locked in the axial direction of the stator, and a locking surface between the stator and the vibration isolating member ( The receiving surface is further expanded. Therefore, the positional accuracy and holding strength of the stator with respect to the center piece can be further improved.

  A brushless motor according to a fifth aspect of the present invention is the brushless motor according to the third or fourth aspect, wherein the vibration isolation member is disposed between the outer peripheral convex portion and the second inner peripheral convex portion in the circumferential direction of the stator. It is the structure which has the interposed stopper part.

  According to this brushless motor, since the stopper portion is interposed between the outer peripheral convex portion and the second inner peripheral convex portion in the circumferential direction of the stator, noise generation due to interference between the outer peripheral convex portion and the second inner peripheral convex portion is prevented. Can be suppressed.

  A brushless motor according to a sixth aspect is the brushless motor according to the fifth aspect, wherein the outer peripheral convex portion is formed on the inner side in the radial direction of the stator with respect to the second inner peripheral convex portion, and the main A second locking portion formed on a radially outer side of the stator with respect to the locking portion; and a second locking portion facing the circumferential direction of the stator, wherein the circumferential end portion is the main locking portion. And a main locked portion that is locked in the circumferential direction of the stator, and a load that acts on the vibration isolating member from the stator. In a state that is equal to or greater than a value assumed in advance, the auxiliary locking portion and a secondary locked portion locked in the circumferential direction of the stator, and the stopper portion in the circumferential direction of the stator It is interposed between the secondary locking part and the second inner peripheral convex part. It was being constructed.

  According to this brushless motor, in a state where the load acting on the vibration isolating member from the stator is less than a value assumed in advance (low load state), the secondary locking portion of the outer peripheral convex portion and the secondary cover of the vibration isolating member are The locking portions are spaced apart from each other in the circumferential direction of the stator, and the main locking portion of the outer peripheral convex portion and the main locked portion of the vibration isolating member are locked in the circumferential direction of the stator. Therefore, in this state, since the spring constant of the vibration isolating member becomes low, low frequency vibration is absorbed by the vibration isolating member.

  On the other hand, in a state where the load acting on the vibration isolation member from the stator is greater than or equal to a value assumed in advance (high load state), the main locking portion of the outer peripheral convex portion and the main locked portion of the vibration isolation member are In addition to being locked in the circumferential direction of the stator, the secondary locking portion of the outer peripheral convex portion and the secondary locked portion of the vibration isolating member are locked in the circumferential direction of the stator. Therefore, in this state, since the spring constant of the vibration isolating member is increased, high frequency vibration is absorbed by the vibration isolating member.

  In this way, by changing the spring constant of the vibration isolating member in accordance with the load acting on the vibration isolating member from the stator, vibration can be effectively absorbed over a wider rotational speed region.

  In addition, as described above, when the load acting on the vibration isolating member from the stator is equal to or greater than a preliminarily assumed value and the sub locking portion and the sub locked portion are locked, this sub locking The vibration can also be absorbed by the stopper portion interposed between the stop portion and the second inner peripheral convex portion. Therefore, the vibration isolation performance in a high load state can be further improved.

  A brushless motor according to a seventh aspect is the brushless motor according to any one of the first to sixth aspects, wherein the rotor is disposed on a radially outer side with respect to the stator and the periphery of the rotating shaft member. A rotor magnet provided along a direction, wherein the cylindrical support portion includes a bearing housing portion that houses a bearing that rotatably supports the rotating shaft member, and an inner peripheral portion of the rotor magnet and the stator When the distance between the outer peripheral portion is S1, the interval between the outer peripheral convex portion and the inner peripheral portion of the stator is S2, and the interval between the bearing housing portion and the inner peripheral convex portion is S3, S1> S2, or The configuration satisfies S1> S3.

  According to this brushless motor, even if the inner periphery of the rotor magnet and the outer periphery of the stator are in contact with each other by vibration during rotation of the rotor, the interval S2 or the interval S3 is set narrower than the interval S1, Prior to the contact between the inner peripheral portion of the rotor magnet and the outer peripheral portion of the stator, the outer peripheral convex portion and the inner peripheral portion of the stator are in contact with each other, or the bearing housing portion and the inner peripheral convex portion are in contact with each other. The Thereby, since these fulfill | perform the function as a stopper, it can suppress that the inner peripheral part of a rotor magnet and the outer peripheral part of a stator contact.

  The brushless motor according to an eighth aspect is the brushless motor according to the seventh aspect, wherein the interval S1, the interval S2, and the interval S3 satisfy S1> S2 and S1> S3. ing.

  According to this brushless motor, the contact state between the outer peripheral convex portion and the inner peripheral portion of the stator, and the bearing housing portion and the inner peripheral convex portion before the inner peripheral portion of the rotor magnet and the outer peripheral portion of the stator contact each other. Can be obtained. Thereby, it can suppress more effectively that the inner peripheral part of a rotor magnet and the outer peripheral part of a stator contact.

  A brushless motor according to a ninth aspect is the brushless motor according to the eighth aspect, wherein the interval S2 and the interval S3 satisfy S2 = S3.

  According to this brushless motor, before the inner peripheral portion of the rotor magnet and the outer peripheral portion of the stator are in contact with each other, the contact state between the outer peripheral convex portion and the inner peripheral portion of the stator, and the bearing housing portion and the stator A contact state with the inner peripheral portion can be obtained at the same time. Thereby, it can suppress more effectively that the inner peripheral part of a rotor magnet and the outer peripheral part of a stator contact.

It is side surface sectional drawing of the brushless motor which concerns on one Embodiment of this invention. FIG. 2 is an enlarged plan view of main parts of a stator core, a plurality of vibration isolation members, and a center piece shown in FIG. 1. It is the principal part expansion perspective view of the stator core and center piece which are shown by FIG. 1, Comprising: It is the figure which abbreviate | omitted illustration of the several vibration isolator. It is a top view of the vibration isolator shown by FIG. It is a side view of the vibration isolator shown by FIG. It is a principal part enlarged plan view which shows the state which assembled | attached the vibration isolator shown by FIG. 1 to the stator core and the center piece. FIG. 7 is an enlarged plan sectional view of a main part of FIG. 6. It is a principal part enlarged plan view of FIG. It is a principal part expanded side view which shows the assembly | attachment state of the stator core shown by FIG. 8, a center piece, and the vibration isolator. It is a principal part enlarged view of the brushless motor shown by FIG. It is a principal part enlarged plan view which shows the modification of the main latching | locking part shown by FIG.

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

  The brushless motor 10 shown in FIG. 1 is suitably used as a fan motor such as a blower motor mounted on a vehicle such as a passenger car. For example, the brushless motor 10 includes a motor housing 12, an end housing 14, and a motor body 16. It is provided as a main configuration.

  The motor housing 12 and the end housing 14 are assembled together, and a motor main body 16 is accommodated therein. The motor main body 16 includes a stator 18, a rotor 20, a rotary shaft member 22, a center piece 24, and a plurality of vibration isolation members 26.

  The stator 18 includes a stator core 28 and a plurality of stator coils 30. The stator core 28 has a plurality of radially formed tooth portions 28A, and the plurality of stator coils 30 are wound around the plurality of tooth portions 28A, respectively. Although not shown in detail in FIG. 1, the stator core 28 is configured to include a laminated core and an insulator attached to the surface of the laminated core.

  The rotor 20 includes a rotor housing 32 and a rotor magnet 34. The rotor housing 32 is formed in a bottomed cylindrical shape, and a cylindrical fitting portion 32 </ b> B is formed at the center of the bottom portion 32 </ b> A of the rotor housing 32. The center portion in the longitudinal direction of the rotary shaft member 22 is fitted to the fitting portion 32B, whereby the rotor 20 is rotated integrally with the rotary shaft member 22.

  The rotor magnet 34 is provided along the circumferential direction of the rotating shaft member 22 and is fixed to the inner circumferential surface of the outer cylindrical portion 32C of the rotor housing 32, and is in the radial direction with respect to the stator core 28 (tooth portion 28A) described above. It is arranged facing the inside. In the brushless motor 10, when a rotating magnetic field is generated in the stator 18, the rotor 20 is rotated by an attractive force and a repulsive force acting between the stator 18 and the rotor magnet 34.

  The center piece 24 includes a center piece main body 36 and a cap 38. The center piece main body 36 is integrally assembled with the end housing 14, and a cylindrical portion 40 extending in the axial direction of the stator 18 is formed at the center thereof. The cylindrical portion 40 is formed with a press-fit hole 42 penetrating along the axial direction at the center thereof. On the other hand, a cylindrical insertion portion 44 is formed in the cap 38, and the cap 38 is integrally assembled to the cylindrical portion 40 by press-fitting the insertion portion 44 into the press-fitting hole 42. In addition, this cap 38 and the cylindrical part 40 comprise the cylindrical support part in this invention.

  The insertion portion 44 is formed with a through hole 46 penetrating in the axial direction, and the rotary shaft member 22 is inserted into the through hole 46. Further, bearing accommodating portions 48 and 49 are formed in the cap 38 and the cylindrical portion 40, and bearings 50 and 51 are accommodated in the bearing accommodating portions 48 and 49, respectively. The rotating shaft member 22 is rotatably supported by the bearings 50 and 51. Further, the distal end side of the rotating shaft member 22 protrudes to the outside through an opening 32D formed in the bottom portion 32A of the motor housing 12, and is connected to an external drive mechanism or the like (not shown).

  Each anti-vibration member 26 is for elastically supporting the stator 18 with respect to the center piece 24, and is made of an elastic body such as rubber. The assembly structure of the vibration isolating member 26, the stator core 28, and the cylindrical portion 40 is as follows.

  That is, as shown in FIGS. 2 and 3, the outer peripheral portion 40 </ b> A of the cylindrical portion 40 is formed with a plurality of outer peripheral convex portions 52 that protrude outward in the radial direction.

  On the other hand, a core main body portion 54 is formed in the center of the stator core 28 in an annular shape on the radially outer side of the cylindrical portion 40. Each inner peripheral portion 54A of the core main body portion 54 has a radially inner side. A plurality of first inner peripheral convex portions 56 protruding in the direction are formed. The plurality of first inner peripheral protrusions 56 and the plurality of outer peripheral protrusions 52 described above are provided at equal intervals in the circumferential direction of the stator 18, and each first inner peripheral protrusion 56 is a pair of adjacent outer peripheral protrusions. 52 is formed at the center.

  In addition, each first inner peripheral protrusion 56 is formed with a protrusion 58 that protrudes radially inward of the stator 18. Furthermore, a plurality of second inner peripheral convex portions 60 that protrude inward in the radial direction are formed on the inner peripheral portion 54A of the core main body portion 54, respectively. The second inner peripheral convex portion 60 is formed in a protrusion extending along the circumferential direction of the stator 18 between the adjacent first inner peripheral convex portion 56 and the outer peripheral convex portion 52.

  The second inner circumferential convex portion 60 and the above-described protrusions 58 are configured to be thinner in the axial direction of the stator core 28 than the first inner circumferential convex portion 56, and are formed in the central portion of the core body portion 54 in the axial direction of the stator core 28. ing.

  As shown in FIG. 2, each anti-vibration member 26 is disposed between the core body portion 54 and the cylindrical portion 40 in the radial direction and between a pair of adjacent outer peripheral convex portions 52. Each anti-vibration member 26 is formed with an arc-shaped outer peripheral portion 26A facing the inner peripheral portion 54A of the core main body 54, and circumferential end portions 62 are formed on both sides in the circumferential direction of the outer peripheral portion 26A. (See also FIGS. 4 and 5).

  As shown in FIG. 6 and FIG. 7, a first outer peripheral recess 64 is formed in the center of the outer peripheral portion 26 </ b> A in the circumferential direction, and a groove 66 is formed in the first outer peripheral recess 64. ing. Furthermore, long groove-like second outer peripheral recesses 68 are respectively formed on both sides of the first outer peripheral recess 64.

  As shown in FIGS. 6 and 7, the vibration isolating member 26 is disposed between the core body portion 54 and the cylindrical portion 40 in the radial direction and between a pair of adjacent outer peripheral convex portions 52. Then, the 1st outer periphery recessed part 64 is latched in the circumferential direction of the 1st inner peripheral convex part 56 and the stator 18, and the 2nd outer peripheral recessed part 68 is the 2nd inner peripheral convex part 60 over the extension direction of the 2nd inner peripheral convex part 60. The groove 66 is locked in the axial direction of the stator 18, and the groove 66 is locked in the axial direction of the protrusion 58 and the stator 18.

  As shown in FIGS. 7 and 8, a main locking portion 52 </ b> A and a sub locking portion 52 </ b> B are formed on the side wall portion of the outer circumferential convex portion 52 that faces the circumferential end 62. The main locking portion 52A is formed on the radially inner side of the stator 18 with respect to the second inner circumferential convex portion 60, and the sub-locking portion 52B is formed on the radially outer side of the stator 18 with respect to the main locking portion 52A. The inner circumferential convex portion 60 is opposed to the circumferential direction of the stator 18.

  On the other hand, a main locked portion 62A and a sub locked portion 62B are formed on each of the circumferential end portions 62 described above. The main locked portion 62A is formed on the inner peripheral portion 26B side of the vibration isolation member 26, and the sub locked portion 62B is on the outer peripheral portion 26A side of the vibration isolation member 26 with respect to the main locked portion 62A. Is formed. Further, the sub locked portion 62B is offset to the inner side in the circumferential direction of the outer peripheral portion 26A with respect to the main locked portion 62A.

  In the state where the vibration isolating member 26 is disposed between the core body portion 54 and the cylindrical portion 40 in the radial direction and between the pair of adjacent outer peripheral convex portions 52, the main locked portion 62A is The sub locking portion 62B is locked in the circumferential direction between the sub locking portion 52B and the stator 18, and is locked in the circumferential direction between the locking portion 52A and the stator 18.

  Further, in this vibration isolating member 26, in a state where the load acting on the vibration isolating member 26 from the stator 18 is not less than a value assumed in advance, the vibration isolating member 26 is elastically deformed and the sub-engaged portion 62B. Are appropriately set such that the elastic modulus and the clearance between the sub-latched portion 62B and the sub-latching portion 52B are latched in the circumferential direction of the sub-latching portion 52B and the stator 18. In addition, the above-mentioned presumed value is appropriately set when the brushless motor 10 is designed.

  Further, as shown in FIGS. 7 and 8, the vibration isolating member 26 is formed with a stopper portion 70 between the auxiliary locking portion 52 </ b> B and the second inner peripheral convex portion 60 in the circumferential direction of the stator 18. (See also FIG. 9).

  In this brushless motor 10, as shown in FIG. 10, the distance between the inner peripheral portion 34 </ b> A of the rotor magnet 34 and the outer peripheral portion 28 </ b> B of the stator core 28 (tooth portion 28 </ b> A) is S <b> 1. When the interval between the inner peripheral portion 28C is S2 and the interval between the bearing housing portion 48 and the first inner peripheral convex portion 56 is S3, S1> S2 or S1> S3 is satisfied.

  Next, the operation and effect of one embodiment of the present invention will be described.

  According to the brushless motor 10, as shown in FIG. 2, a plurality of vibration isolation members 26 are arranged between the stator 18 and the center piece 24. The first outer circumferential recess 64 formed in each vibration isolating member 26 is locked in the circumferential direction of the first inner circumferential convex portion 56 formed in the stator 18 and the stator 18, and is formed in each vibration isolating member 26. The circumferential end 62 is engaged with the outer peripheral convex portion 52 formed on the center piece 24 and the circumferential direction of the stator 18. Accordingly, even when vibration is generated in the stator 18, this vibration is absorbed by the vibration isolation member 26, so that transmission of this vibration to the center piece 24 can be suppressed.

  Here, the first inner peripheral convex portion 56 is formed at the center of a pair of adjacent outer peripheral convex portions 52, and the first outer peripheral concave portion 64 locked to the first inner peripheral convex portion 56 is the outer peripheral portion of the vibration isolation member 26. It is formed at the center in the circumferential direction of 26A. Therefore, as shown in FIGS. 4 to 7, in this vibration isolator 26, the volume of the buffer portion 72 formed between the first outer circumferential recess 64 and the circumferential end 62 is larger than that of the conventional one. Since it can be increased, the vibration isolation performance can be improved.

  Further, according to the brushless motor 10, when the load applied from the stator 18 to the vibration isolation member 26 is less than a value assumed in advance (low load state), the sub locking portion 52B and the sub locked portion The portions 62B are spaced apart from each other in the circumferential direction of the stator 18, and the main locking portion 52A and the main locked portion 62A are locked in the circumferential direction of the stator 18. Therefore, in this state, since the spring constant of the vibration isolating member 26 is lowered, the vibration isolating member 26 absorbs the low frequency vibration.

  On the other hand, in a state where the load acting on the vibration isolation member 26 from the stator 18 is greater than or equal to a value assumed in advance (high load state), the main locking portion 52A and the main locked portion 62A are connected to the periphery of the stator 18. In addition to being locked in the direction, the sub locking portion 52B and the sub locked portion 62B are locked in the circumferential direction of the stator 18. Therefore, in this state, since the spring constant of the vibration isolating member 26 is increased, high frequency vibrations are absorbed by the vibration isolating member 26.

  In this way, by changing the spring constant of the vibration isolation member 26 according to the load acting on the vibration isolation member 26 from the stator 18, vibration can be effectively absorbed over a wider rotational speed region. Can do.

  Moreover, according to the brushless motor 10, the second inner peripheral convex portion 60 formed on the stator 18 extends along the circumferential direction of the stator 18, and the second outer peripheral concave portion 68 formed on the vibration isolation member 26. Is locked in the axial direction of the second inner peripheral convex portion 60 and the stator 18 over the extending direction of the second inner peripheral convex portion 60. Accordingly, since the locking surface (receiving surface) between the stator 18 and the vibration isolating member 26 is enlarged, the positional accuracy and holding strength of the stator 18 with respect to the center piece 24 can be improved. Thereby, the balance of the stator 18 with respect to the center piece 24 can be maintained.

  In particular, the first inner peripheral convex portion 56 and the first outer peripheral concave portion 64 are respectively formed with a protrusion 58 and a groove portion 66 that are locked in the axial direction of the stator 18, so that the stator 18 and the vibration isolation member 26 are locked. The surface (receiving surface) is further expanded. Therefore, the positional accuracy and holding strength of the stator 18 with respect to the center piece 24 can be further improved.

  Further, according to the brushless motor 10, since the stopper portion 70 is interposed between the secondary locking portion 52B and the second inner peripheral convex portion 60 in the circumferential direction of the stator 18, the secondary locking portion 52B (outer periphery) Generation of noise due to interference between the convex portion 52) and the second inner peripheral convex portion 60 can be suppressed.

  In addition, as described above, in a state where the load acting on the vibration isolation member 26 from the stator 18 is equal to or greater than a preliminarily assumed value and the sub-engagement portion 52B and the sub-engagement portion 62B are engaged. The vibration can also be absorbed by the stopper portion 70 interposed between the sub-engaging portion 52B and the second inner peripheral convex portion 60. Therefore, the vibration isolation performance in a high load state can be further improved.

  Further, as shown in FIG. 10, according to the brushless motor 10, even if the inner peripheral portion 34A of the rotor magnet 34 and the outer peripheral portion 28B of the stator core 28 try to contact with each other by vibration or the like when the rotor 20 rotates, the distance S1. Since the interval S2 or the interval S3 is set to be narrower, the outer peripheral convex portion 52 and the inner periphery of the stator core 28 are placed before the inner peripheral portion 34A of the rotor magnet 34 and the outer peripheral portion 28B of the stator core 28 are in contact with each other. The portion 28C is brought into contact with the bearing housing portion 48 or the first inner peripheral convex portion 56 is brought into contact with the portion 28C. Thereby, since these serve as a stopper, it is possible to suppress the contact between the inner peripheral portion 34 </ b> A of the rotor magnet 34 and the outer peripheral portion 28 </ b> B of the stator core 28.

  In this case, if the intervals S1, S2, and S3 satisfy S1> S2 and S1> S3, the inner periphery 34A of the rotor magnet 34 and the outer periphery of the stator core 28 Prior to contact with the portion 28B, a contact state between the outer peripheral convex portion 52 and the inner peripheral portion 28C of the stator core 28 and a contact state between the bearing housing portion 48 and the first inner peripheral convex portion 56 can be obtained. it can. Thereby, it can suppress more effectively that the inner peripheral part 34A of the rotor magnet 34 and the outer peripheral part 28B of the stator core 28 contact.

  In particular, when the interval S2 and the interval S3 are configured to satisfy S2 = S3, the outer peripheral convex portion 52 is formed before the inner peripheral portion 34A of the rotor magnet 34 and the outer peripheral portion 28B of the stator core 28 come into contact with each other. And the contact state between the inner peripheral portion 28C of the stator core 28 and the contact state between the bearing housing portion 48 and the first inner peripheral convex portion 56 can be obtained simultaneously. Thereby, it can suppress more effectively that the inner peripheral part 34A of the rotor magnet 34 and the outer peripheral part 28B of the stator core 28 contact.

  Next, a modification of one embodiment of the present invention will be described.

  In the above embodiment, the main locked portion 62A and the sub locked portion 62B are formed with a step, but the main locked portion 62A and the sub locked portion 62B are continuous with each other. It may be formed by an inclined surface that is inclined with respect to the radial direction of the stator 18 so as to be separated from the circumferential end 62 as it goes outward in the radial direction of the stator 18.

  Further, in the above embodiment, the main engagement portion 52A and the sub engagement portion 52B are formed in a continuous planar shape, and the sub engagement portion 62B is separated from the sub engagement portion 52B. Although the locking portion 62A and the sub-latched portion 62B are formed with a step, they may be formed as follows.

  That is, as shown in FIG. 11, the main locked portion 62A and the sub locked portion 62B are formed in a continuous planar shape, and the sub locking portion 52B is separated from the sub locked portion 62B. Thus, the main locking part 52A and the sub locking part 52B may be formed with a step.

  Although not particularly illustrated, the main locking portion 52A and the sub locking portion 52B, and the main locking portion 52A and the sub locking portion so that the sub locking portion 52B is separated from the sub locked portion 62B. Each of 52B may be formed with a step.

  For example, when it is not necessary to change the spring constant of the vibration isolation member 26, the entire circumferential end 62 may be locked in the circumferential direction of the outer peripheral convex portion 52 and the stator 18.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited above, In addition to the above, in the range which does not deviate from the main point, it can implement in various deformation | transformation.

DESCRIPTION OF SYMBOLS 10 ... Brushless motor, 12 ... Motor housing, 14 ... End housing, 16 ... Motor body, 18 ... Stator, 20 ... Rotor, 22 ... Rotating shaft member, 24 .. Centerpiece, 26... Anti-vibration member, 26 A. Outer periphery, 26 B. Inner periphery, 28... Stator core, 28 A. ..Rotor housing, 34... Rotor magnet, 36... Centerpiece body, 38... Cap (a part of cylindrical support part), 40. ... outer periphery, 42 ... press-fitting hole, 44 ... insertion part, 46 ... through hole, 48, 49 ... bearing housing part, 50, 51 ... bearing, 52 ... outer periphery Convex part, 52A ... main locking part, 52B ... Sub-locking portion, 54... Core body portion, 54A... Inner peripheral portion, 56... First inner peripheral convex portion (inner peripheral convex portion), 58. 62 ... circumferential end, 62A ... main locked portion, 62B ... sub locked portion, 64 ... first outer peripheral recess (outer peripheral recess), 66 ... groove, 68 ..Second outer peripheral recess, 70 ... stopper, 72 ... buffer

Claims (9)

A rotating shaft member;
A rotor supported by the rotating shaft member;
A center piece having a cylindrical support portion that supports the rotating shaft member, and a plurality of outer peripheral convex portions that respectively protrude radially outward from the cylindrical support portion;
A stator having a plurality of inner peripheral convex portions formed annularly on the radially outer side of the cylindrical support portion, each projecting radially inward from the inner peripheral portion and formed at the central portion of a pair of adjacent outer peripheral convex portions;
An arc shape that is disposed between the pair of outer peripheral convex portions adjacent to each other in the radial direction between the stator and the cylindrical support portion, and that is configured by an elastic body and that faces the inner peripheral portion of the stator. An outer peripheral portion, a pair of circumferential end portions formed on both sides of the outer peripheral portion in the circumferential direction and at least a part of which are locked in the circumferential direction of the outer peripheral convex portion and the stator, and formed on the outer peripheral portion. A plurality of vibration isolating members having a circumferential convex portion and an outer circumferential concave portion locked in the circumferential direction of the stator;
Brushless motor with The outer peripheral convex portion has a main locking portion and a sub locking portion formed to be shifted from each other in the radial direction of the stator,
The circumferential end is
A main locked portion locked in the circumferential direction of the main locking portion and the stator;
In a state where a load acting on the vibration isolating member from the stator is greater than a value assumed in advance, the sub locking portion and the stator are separated from each other in the circumferential direction of the stator. A sub-latched portion that is latched in the circumferential direction of the stator;
have,
The brushless motor according to claim 1. The stator is
A plurality of first inner peripheral protrusions as the plurality of inner peripheral protrusions;
A plurality of second inner circumferential protrusions extending along the circumferential direction of the stator between the adjacent first inner circumferential protrusion and the outer circumferential protrusion, respectively, projecting radially inward from the inner circumferential part;
Have
The vibration isolator is
A first outer peripheral recess as the outer peripheral recess,
A second outer peripheral concave portion formed in the outer peripheral portion and locked in the axial direction of the stator over the second inner peripheral convex portion in the extending direction;
have,
The brushless motor according to claim 1 or 2. The first inner peripheral convex portion is formed with a protruding portion that protrudes radially inward of the stator,
The first outer peripheral recess is formed with a groove that is locked in the axial direction of the protrusion and the stator.
The brushless motor according to claim 3. The vibration-proof member has a stopper portion interposed between the outer peripheral convex portion and the second inner peripheral convex portion in the circumferential direction of the stator.
The brushless motor according to claim 3 or 4. The outer peripheral convex part is
A main locking portion formed on the radially inner side of the stator with respect to the second inner circumferential convex portion;
A sub-locking portion formed on the outer side in the radial direction of the stator with respect to the main locking portion and opposed to the second inner circumferential convex portion and the stator in the circumferential direction;
Have
The circumferential end is
A main locked portion locked in the circumferential direction of the main locking portion and the stator;
In a state where a load acting on the vibration isolating member from the stator is greater than a value assumed in advance, the sub locking portion and the stator are separated from each other in the circumferential direction of the stator. A sub-latched portion that is latched in the circumferential direction of the stator;
Have
The stopper portion is interposed between the sub locking portion and the second inner peripheral convex portion in the circumferential direction of the stator,
The brushless motor according to claim 5. The rotor has a rotor magnet disposed along a circumferential direction of the rotary shaft member and disposed on a radially outer side with respect to the stator.
The cylindrical support portion has a bearing accommodating portion that accommodates a bearing that rotatably supports the rotating shaft member,
The interval between the inner peripheral portion of the rotor magnet and the outer peripheral portion of the stator is S1, the interval between the outer peripheral convex portion and the inner peripheral portion of the stator is S2, and the interval between the bearing housing portion and the inner peripheral convex portion is S3. If S1> S2 or S1> S3 is satisfied,
The brushless motor as described in any one of Claims 1-6. The interval S1, the interval S2, and the interval S3 satisfy S1> S2 and S1> S3.
The brushless motor according to claim 7. The interval S2 and the interval S3 satisfy S2 = S3.
The brushless motor according to claim 8.

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