JP5430479B2 - Drive motor - Google Patents

Description

  The present invention relates to a motor for driving a predetermined air conditioner such as a fan housed in a case having a passage through which air flows, such as a blower case of a blower unit that constitutes an air conditioner for a vehicle, and particularly, rainwater and the like. The present invention relates to a drive motor designed to be waterproof against moisture.

  For example, when air is introduced from the outside of the passenger compartment by selecting the outside air introduction mode in the air blowing unit of the vehicle air conditioner, the rainwater is also taken into the mist together with the outside air when the weather is rainy, It is known that water droplets adhere to electrical equipment such as the armature included in the drive motor, resulting in poor insulation of the electrical equipment such as the armature or rusting of components. Yes. In response to this, as shown in Patent Document 1, a metal casing extending in an umbrella shape opened from the rotating shaft below the boss portion of the impeller and the cone portion extending from the boss portion, and a lower portion of the casing An internal space is formed with a non-metallic (for example, resin) bottom plate capable of closing the opening, and an armature is accommodated in the internal space. Further, the casing and the bottom plate are formed at the periphery and outward. A motor having a configuration in which the extending flange portions are fixed and fixed together by screwing together is already known.

  In addition, it corresponds to an air conditioner outdoor unit instead of a blower unit for a vehicle air conditioner. In order to prevent moisture from entering the motor when the air conditioner outdoor unit is exposed to water. The brushless motor having the structure is already known as disclosed in Patent Document 2, for example. The waterproof structure of this brushless motor will be briefly described. The cylindrical casing including the stator to be waterproofed is composed of left and right cup-shaped casings divided into two at the substantially central vertical surface in the direction of the rotational axis. As for the mating surface of the cup-shaped casing, a protrusion is provided on the surface of one cup-shaped casing, and a groove is provided on the surface of the other cup-shaped casing so that the protrusion is inserted into the groove and between the groove and the protrusion. By interposing an O-ring, the left and right cup-shaped casings are joined with good airtightness.

  On the other hand, when the magnetic force is switched, there are various vibrations such as magnetic vibration in the rotation direction of the drive motor (direction along the radial direction of the rotation shaft), the flow of air taken in, and subtle misalignment of the rotation shaft. For example, as disclosed in Patent Document 3, a movement that rotates in a circle so that both ends in the longitudinal direction of the rotation shaft rub against the rake (hereinafter referred to as a rake movement) is generated. Are known.

Japanese Utility Model Publication No. 2-139473 JP-A-10-304640 JP 2001-145300 A

  For this reason, it is necessary to adopt a waterproof structure for the drive motor that takes into account two vibration components such as rotational vibration and magnetic vibration and suppresses an increase in the manufacturing cost of the drive motor due to the provision of this waterproof structure.

  However, in the structure of the motor shown in Patent Document 1, when a metal casing and a non-metal (for example, resin) bottom plate are joined, a waterproof effect can be sufficiently obtained. In addition, it is necessary to additionally use a sealing structure in which an elastic member is interposed between the casing and the bottom plate. The added elastic member increases the number of parts of the motor, increasing the number of steps of the motor and the manufacturing cost. Have the disadvantage of incurring an increase in Further, since the casing and the bottom plate are screwed and fixed, vibrations caused by a rotating body such as a rotating shaft or a rotor assembly are applied to the casing via a bearing positioned relatively above in the axial direction of the rotating shaft. In addition to being transmitted, it is transmitted to the bottom plate via a bearing positioned relatively below in the axial direction of the rotating shaft, and further transmitted from the screwed portion to the casing, thus supporting this motor. This also has the disadvantage of being easily transmitted to the member to be performed.

  Moreover, in the structure of the brushless motor shown in Patent Document 2, the cylindrical casing is composed of two cup-shaped casings, and an O-ring is interposed between the cup-shaped casings, so that the casing generated inside the motor is reduced. While the vibration excitation force can be attenuated, since the O-ring is compressed in the axial direction of the rotating shaft, the vibration damping effect in the axial direction of the rotating shaft is relatively small. And with respect to the vibration in the radial direction of the rotating shaft, since the protrusion of one cup-shaped casing is fitted in the groove of the other cup-shaped casing, the vibration cannot be attenuated. Therefore, the structure of the brushless motor disclosed in Patent Document 2 has a disadvantage that the vibration component damping effect cannot be sufficiently obtained.

  Accordingly, the present invention reliably waterproofs the motor internal space while reliably attenuating the transmission amount of the vibration component and suppressing the transmission of vibration to the flange while having a simple structure that suppresses an increase in manufacturing cost. It is an object of the present invention to provide a drive motor that can be used.

The drive motor according to the present invention transmits a rotational force to the rotated member to rotate the rotated member, and is relatively relative to the first opening and the rotated member that are relatively close to the rotated member. A rotary shaft that forms a motor internal space with a housing having a second opening that is spaced apart and a flange that closes the second opening of the housing, and that is rotated by attaching and rotating the member to be rotated. One end portion in the axial direction protrudes from the first opening to the outside, and the other end portion in the axial direction of the rotation shaft is mounted on the housing so as to be included in the motor internal space. The flange is provided with a peripheral elastic member on a surface facing the second opening of the housing, and the peripheral elastic member is compressed by a pressure from a direction along a substantially radial direction of the rotating shaft by the housing. On the other hand, the portion is in contact with the vicinity of the second opening of the outer peripheral surface of the housing so that a compressive force does not act in the direction along the axial direction of the rotating shaft. . Here, the rotated member includes a multi-blade fan housed in a blower case of a blower unit. The peripheral elastic member may be provided integrally with the flange as a separate member from the flange.
The drive motor is attached to a rotation shaft in the motor internal space and rotates with the rotation shaft. The drive motor faces the rotor assembly in a direction along the radial direction of the rotation shaft and rotates the rotation assembly. A stator assembly arranged so as not to rotate together with the shaft, and a control board for controlling the rotation of the rotating shaft and the rotor assembly are also included. For example, the rotating shaft is arranged more than the stator assembly and the rotor assembly. The control board is disposed on the first opening side of the housing in the direction along the axial direction, and the yoke is disposed on the second opening side of the housing in the direction along the axial direction of the rotating shaft. It is for the ventilation unit currently used.

  As a result, the peripheral elastic member is disposed on a portion of the surface of the flange facing the second opening of the housing that is radially outward of the rotating shaft, and the radially inner surface of the rotating shaft of the peripheral elastic member is disposed on the housing. Since it is in a state of being pressed and compressed by the housing toward the outside in the radial direction of the rotating shaft, moisture such as rainwater does not enter the motor internal space from between the peripheral elastic member and the housing. Since the waterproof effect by the peripheral elastic member is not pressed by the housing against the surface of the peripheral elastic member on the axial direction side of the rotating shaft, the peripheral elastic member is not compressed along the axial direction of the rotating shaft, so that the flange from the housing Since the transmission of vibration components such as magnetic vibration and rotational vibration is suppressed, a vibration isolation effect by the peripheral elastic member can also be obtained.

  Furthermore, the drive motor according to claim 1, a boss housing having a bearing portion for rotatably supporting the rotating shaft, a fixing means for holding the bearing portion and fixing to the flange, A rotor assembly that is attached to a rotating shaft and rotates together with the rotating shaft; and a stator assembly that faces the rotor assembly in a direction along a radial direction of the rotating shaft and is arranged not to rotate with the rotating shaft; And a control board for controlling the rotation of the rotation shaft and the rotor assembly in the motor internal space, and at least the rotation shaft, the bearing portion, the boss housing, the rotor assembly, and the control A motor main body is configured by connecting a substrate to the housing side, and the second of the housing is formed by the flange. In closing the opening side, an interposed elastic member having a receiving portion is disposed on the flange, and the receiving portion of the interposed elastic member includes a surface that contacts a surface facing the flange side of the housing, The motor main body may be supported by the receiving portion by surrounding the rotating shaft with the receiving portion by disposing the receiving portion at three or more locations with respect to the interposed elastic member. ). Here, the mode of supporting the motor main body by the receiving portion may be from the left and right directions or from the oblique direction for convenience of vehicle layout as well as from below.

  As a result, when the second opening side of the housing is closed with the flange, the flange is indirectly in contact with the housing via the receiving portion of the interposed elastic member. Transmission of vibration from the housing to the flange can be suppressed.

  On the other hand, the drive motor according to the present invention transmits a rotational force to the rotated member to rotate the rotated member, and the first opening is opened on the side relatively close to the rotated member. And a housing having a second opening that opens on a side relatively spaced from the rotated member, and a flange that closes the second opening of the housing form a motor internal space, and the rotated member A rotating shaft to which the rotating shaft is attached causes one end in the axial direction of the rotating shaft to protrude outside from the first opening, and the other end in the axial direction of the rotating shaft is included in the motor internal space. And a sealing material having an elastic function interposed in an annular space between the first opening of the housing and the rotating shaft. ). The drive motor has a rotor assembly attached to the rotation shaft and rotated together with the rotation shaft in the motor internal space, and is opposed to the rotor assembly in a direction along a radial direction of the rotation shaft and A stator assembly arranged so as not to rotate together with the rotation shaft, and a control board for controlling the rotation of the rotation shaft and the rotor assembly are also included, for example, the rotation shaft more than the stator assembly and the rotor assembly. The control board is disposed on the second opening side of the housing in the direction along the axial direction of the housing, and the yoke is disposed on the first opening side of the housing in the direction along the axial direction of the rotating shaft. It is for the ventilation unit of the specification different from Claim 2 arrange | positioned.

  Thereby, since the sealing material is interposed in the annular space between the first opening of the housing and the rotating shaft, there is no gap between the first opening of the housing and the rotating shaft, and the first opening of the housing Moisture such as rainwater can enter the motor internal space from the space between the rotating shaft and the sealing member is provided with an elastic function so that rotation vibration can be transmitted from the rotating shaft to the housing. It is suppressed.

  The drive motor according to the present invention transmits a rotational force to the rotated member to rotate the rotated member. The drive motor of the present invention has a first opening opened on a side relatively close to the rotated member, and the A motor internal space is formed by a housing having a second opening that opens on a side relatively away from the rotated member, and a flange that closes the second opening of the housing, and the rotated member is attached The rotating shaft to be rotated causes one end of the direction along the axial direction of the rotating shaft to protrude outside from the first opening, and the other end of the direction along the axial direction of the rotating shaft is the motor. The rotating member is mounted on the housing so as to be contained in an internal space, and the rotated member includes a cone portion having a boss portion to which the rotation shaft is fixed, and the cone portion is more than the boss portion. Axis of rotation A first cylindrical portion that extends radially outward to the other end side in the axial direction of the rotary shaft, and the housing extends to one end side in the axial direction of the rotary shaft and The second cylindrical portion has a second cylindrical portion whose diameter is smaller than the inner diameter of the first cylindrical portion, and the first opening through which the rotating shaft can be inserted is provided in the second cylindrical portion, A flange is formed by extending a peripheral portion of the first opening toward the rotation shaft, and the first cylindrical portion is formed in the first cylindrical portion when the drive motor and the rotated member are assembled. The second cylindrical part is accommodated, and a space defined by the first cylindrical part and the second cylindrical part is relatively complicatedly defined (claim). 4). Thereby, since a sealing member can be made unnecessary, the number of parts of a drive motor is reduced.

  Furthermore, the drive motor according to claim 3 or 4 is configured such that at least the rotating shaft, the bearing portion, the boss housing, and the rotor assembly are integrated as a vibrating body through an elastic member for placement. The vibrating body may be fixed to the flange. As a result, the interposed mounting elastic member attenuates the amount of vibration transmitted, so that transmission of vibration components from the vibrating body to the flange can be suppressed.

  As described above, according to the first and second aspects of the present invention, the peripheral elastic member is provided in a portion of the surface of the flange facing the second opening of the housing that is radially outward of the rotating shaft. Since the radially inner surface of the rotating shaft of the peripheral elastic member is in contact with the housing and pressed by the housing toward the radially outer side of the rotating shaft, the peripheral elastic member is placed on the outer peripheral surface of the housing. Since water adheres to the motor internal space from between the peripheral elastic member and the housing and does not enter the interior space of the motor, a waterproof effect by the peripheral elastic member can be obtained. In addition, since the peripheral elastic member is not compressed along the axial direction of the rotating shaft because the housing is not pressed against the surface on the axial direction side of the rotating shaft of the peripheral elastic member, magnetic vibration or rotation from the housing to the flange is not possible. Since the transmission of vibration is suppressed, a vibration isolation effect by the peripheral elastic member can also be obtained. As a result, it is not necessary to apply a sealing material for waterproofing to the motor components housed in the motor internal space with a simple structure, so that an increase in the number of manufacturing steps and an increase in manufacturing costs of the drive motor are suppressed. Generation of noise from the drive motor can also be prevented.

  In particular, according to the invention described in claim 2, since the housing is placed on the receiving portion of the interposed elastic member of the flange, the contact area of the flange with the housing is relatively small, and the magnetic force transmitted from the housing to the flange is reduced. Since vibration and rotational vibration can be suppressed, it is possible to further improve the vibration isolation effect on the flange, and more effectively suppress noise from the drive motor.

  On the other hand, according to the third or fifth aspect of the present invention, the seal member is interposed between the first opening of the housing and the rotation shaft, and the space between the first opening of the housing and the rotation shaft is hermetically sealed. Since it is closed with good performance, there is no gap between the first opening of the housing and the rotating shaft, and it is possible to prevent moisture such as rainwater from entering the motor internal space from there between, and the seal member is elastic. By providing the function, transmission of rotational vibration from the rotating shaft to the housing can be suppressed.

  In particular, according to the fourth aspect of the present invention, moisture such as rainwater can be prevented from entering the motor internal space from the gap between the first opening of the housing and the rotating shaft without a seal member. Since the seal member can be dispensed with and the number of parts of the drive motor can be reduced, the manufacturing cost of the drive motor can be reduced.

  In particular, according to the fifth aspect of the present invention, the interposed mounting elastic member attenuates the transmission amount of the vibration component, so that the transmission of the vibration component from the vibrating body to the flange can be suppressed.

Fig.1 (a) is description about the ventilation unit which uses what concerns on Example 1 among the drive motors which concern on this invention, and the blower case which accommodated this ventilation unit, FIG.1 (b) is FIG. It is AA sectional view taken on the line of a). FIG. 2 is a cross-sectional view illustrating the configuration of the drive motor according to the first embodiment. FIG. 3 is a plan view showing a state where the flange constituting the drive motor according to the first embodiment is viewed from the housing side. FIG. 4 is an enlarged view showing the configuration of the interposed elastic member of the flange, the peripheral elastic member thereof, and the receiving portion. FIG. 5 is a cross-sectional view showing a combined state of the peripheral elastic member of the interposed elastic member of the flange and the receiving portion and the housing. FIG. 6 is a further enlarged cross-sectional view of FIG. 5 for illustrating the configuration of the peripheral elastic member. FIG. 7 is an explanatory diagram for explaining a spring constant of a portion having a receiving portion of the intervening elastic member. FIG. 8A is an explanation of a blower unit using the drive motor according to the second embodiment of the drive motor according to the present invention and a blower case containing the blower unit, and FIG. It is BB sectional drawing of a). FIG. 9 is a cross-sectional view showing the configuration of the drive motor according to the second embodiment. FIG. 10 is a half cross-sectional view showing a configuration of a seal member interposed in an annular space between the rotary shaft and the first opening of the housing constituting the drive motor according to the second embodiment. FIG. 11A is an explanatory diagram showing the configuration of the control board used in the drive motor according to the second embodiment, particularly the configuration on the bottom side, and FIG. It is explanatory drawing which showed the structure of the flange used for the drive motor which concerns, especially the structure of the upper surface side. FIG. 12 shows a modified example of the upper portion of the drive motor shown in FIG. 9, and has a configuration in which the sealing member is not required to be inserted into the annular space between the first opening of the housing and the rotating shaft. It is sectional drawing shown.

  Hereinafter, embodiments of the present invention will be described by dividing them into a first embodiment and a second embodiment with reference to the accompanying drawings.

  First, the blower unit 1 according to the first embodiment will be described with reference to FIGS. 1 to 7.

  A blower unit 1 shown in FIG. 1 is disposed, for example, on the downstream side of a battery to cool a battery (not shown), and is used for sucking and discharging air warmed by the battery. And has a scroll blower case 2, a drive motor 3, and a multiblade fan 4.

  The blower case 2 is formed of resin or the like, and is opposed to the upper side wall 7 having an opening 6 in which the bell mouth 5 is provided as a single body or separately from the upper side wall 7 with a predetermined interval. A lower wall 9 formed in a shape and formed with a motor insertion hole 8 for mounting the drive motor 3, and an outer periphery provided in such a manner that the discharge port 11 is left so as to connect the outer peripheral edges of the upper wall 7 and the lower wall 9. And a wall 10. The outer peripheral wall 10 is formed in a spiral shape starting from the winding start portion 10a and extending along the circumferential direction of the multi-blade fan 4 from here to the distance from the center of the multi-blade fan 4 gradually increasing.

  The multiblade fan 4 is known per se, and as shown in FIGS. 1 and 2, a boss portion 13 fixed to a rotating shaft 12 of the drive motor 3 described below and a boss portion 13 connected to the boss portion 13. And a plurality of blades 15 provided along the circumferential direction of the outer peripheral edge of the cone portion 14 and standing along the axial direction of the rotary shaft 12. The air that is defined by 15 and flows in from the suction port 16 that faces the cone portion 14 is guided to the blade 15 side along the cone portion 14 and passes between the blade 15 and the blade 15. ing.

  As shown in FIGS. 1 and 2, the drive motor 3 includes a rotating shaft 12, a boss housing 21, a stator assembly 18 attached to the outer peripheral surface of the boss housing 21, a control board 19, and a rotor assembly 20. The motor main body 23 is constituted by the housing 21 and the flange 22.

  Among these, the rotating shaft 12 has a substantially circular rod shape, and a rotating member such as the multiblade fan 4 is attached to one end which is the upper end side in the longitudinal direction. The rotating member is rotatable. The rotary shaft 12 is rotatably supported via bearings 25 and 26 on a cylindrical boss housing 21 extending downward along the axial direction of the rotary shaft 12 from a housing 21 having the following configuration. And are not connected. The bearings 25 and 26 are, for example, ball bearings, and the bearing 25 can prevent rainwater flying with the wind from entering a motor internal space 50 described later.

  A stator assembly 18 is disposed on the outer peripheral surface of the boss housing 21 that extends along the axial direction of the rotary shaft 12. In this embodiment, the stator assembly 18 includes a slot insulator 27, a core portion 28, and armature windings 29 and 30. The slot insulator 27 includes an upper portion 27a located on the upper side in the direction along the axial direction of the rotary shaft 12 (on the side opposite to the flange 22), and the lower side in the direction along the axial direction of the rotary shaft 12 (on the flange 22 side). ), And a core portion 28 made of, for example, iron is sandwiched between the upper portion 27a and the lower portion 27b of the slot insulator 27. Further, the armature windings 29 and 30 are wound around the upper portion 27a and the lower portion 27b of the slot insulator 27 several times.

  Further, the rotor assembly 20 is attached to the rotary shaft 12 below the stator assembly 18 in the axial direction of the rotary shaft 12. The rotor assembly 20 faces the stator assembly 18 in a direction along the radial direction of the rotating shaft 12, and is disposed on the inner surface of the yoke 32 so as to face the yoke 32 and the core portion 28 of the stator assembly 18. The magnet 33 is provided. The magnet 33 is a magnet made of sintered ferrite, for example.

  With this configuration, the drive motor 3 rotates the rotor assembly 20 with the rotating magnetic field generated by the stator assembly 18, and further rotates the rotating shaft 12 with the rotation of the rotor assembly 20. The same applies to the drive motor 3 of Example 2 described later.

  The drive motor 3 has a control board 19 on which electronic components that perform control such as switching the current supplied to the armature windings 29 and 30 of the stator assembly 18 with an electronic switch are disposed. The control board 19 includes a heat radiating component 35 such as a transistor. In this embodiment, the control board 19 is fixed to the upper portion 27 a of the slot insulator 27 of the stator assembly 18 by a fixing member 36 such as a screw. And it is arrange | positioned rather than the rotor assembly 20 at the upper end part side among the directions along the axial direction of the rotating shaft 12. FIG.

  And the silicon grease 37 is apply | coated around the thermal radiation components 35, such as a transistor. Thereby, the heat generated by the heat dissipating component 35 is transmitted to the housing 21 described below through the silicon grease 37 and is radiated from the housing 21 to the outside.

  The housing 21 extends in the radial direction of the rotary shaft 12 in the vicinity of the end portion on the boss portion 13 side of the rotary shaft 12 shown in FIG. 1 and is opposite to the boss portion 13 side of the rotary shaft 12. The side opposite to the boss portion 13 is open toward the end on the side, and the overall shape thereof is a substantially open umbrella shape, the first opening on the multi-blade fan 4 side, and the flange It has a cylindrical shape having a second opening on the 22 side. The housing 21 is made of a material having excellent thermal conductivity, for example, a metal such as aluminum. In this embodiment, the housing 21 has a boss housing 21 that extends downward along the axial direction of the rotary shaft 12 from the vicinity of the first opening in the inner surface thereof.

  The flange 22 is capable of closing the second opening side of the housing 21 and is formed of, for example, polypropylene (PP) resin or the like, and as shown in FIG. The recess 39 is opened so as to face the housing 21 side. But this hollow part 39 is a slight space comprised by the dimension of an axial direction 10 mm or less, for example. Further, the flange 22 may be formed of iron or the like. The flange 22 extends outward from the flange 22 as shown in FIG. 3 in order to fix the drive motor 3 to another apparatus, for example, the blower case 2 of the blower unit 1 constituting the vehicle air conditioner. Each extending portion 40 has a through-hole 40a.

  Therefore, by assembling the housing 21 and the flange 22 to each other, a motor internal space 50 is formed in the drive motor 3 as shown in FIG. The motor internal space 50 includes at least the end portion on the opposite side of the control board 19 and the rotary shaft 12 from the boss portion 13, and the stator assembly 18 and the rotor assembly in the space section below the control board 19. 20 is included.

  As a result, in the drive motor 3 according to the present invention, since all the parts arranged below the flange 22 in the conventional drive motor are arranged above the flange 22, the flange in the conventional drive motor Since the lower case attached below 22 is not necessary, the lower side of the drive motor 3 is formed in a substantially flat shape as shown in FIG. 1B and FIG. However, it is possible to avoid the drive motor 3 from protruding outside the duct, and the layout of the drive motor 3 when the blower unit 1 is mounted on a vehicle or the like can be improved. As the drive motor 3 is configured as described above, the dimension H1 (shown in FIG. 1B) along the axial direction of the rotary shaft 12 of the drive motor 3 is set to the lower case of the conventional drive motor. The thickness can be made relatively small.

  By the way, in this embodiment, the housing 21 has, as shown in FIG. 2, a flange facing surface facing the flange 22 side at the periphery of the opening on the flange 22 side, and from the flange facing surface toward the flange 22. Thus, a plurality of protrusions 41 protruding along the axial direction of the rotary shaft 12 are provided. A screw hole 42 extending along the axial direction of the rotary shaft 12 is opened at the top of the protruding portion 41 on the protruding side, and a screw 44 can be attached. Further, an annular washer 43 is mounted on the outer peripheral surface of the protrusion 41 as shown in FIGS. This washer 43 has flat surfaces on both sides.

  As shown in FIG. 2 and FIG. 3, the flange 22 is formed with a notch 45 extending along the circumferential direction around the rotation shaft 12 at a portion facing the flange facing surface of the housing 21. The interposed elastic member 46 is fitted in the notch 45 in a press-fit state.

  The intervening elastic member 46 is formed of a material generally used for elastic members for vehicle air conditioners, such as ethylene-propylene-diene rubber (EPDM), butyl rubber (IIR), elastomer, etc. 4, the protrusion 41 has a through-hole 47 into which the protrusion 41 can be attached, and a peripheral elastic member 48 on the outer peripheral side of the flange 22 from the through-hole 47.

  The peripheral elastic member 48 is arranged in a thin annular shape relative to the flange 22 as shown in FIGS. 3 and 4, and as shown in FIGS. The tip extends from the receiving portion 49 described later toward the housing 21 side. When the housing 21 and the flange 22 are joined to each other, the front end portion of the peripheral elastic member 48 has an inner surface located on the outer peripheral surface 21a side of the housing 21 as shown in FIG. The outer surface 21a of the housing 21 is pressed toward the outer side (indicated by the arrow in FIG. 6) and is compressed toward the outside and is in a state of being in contact with the outer surface 21a while buckling. On the other hand, the top 48a of the peripheral elastic member 48 is not in contact with the outer peripheral surface 21a of the housing 21 even when the housing 21 and the flange 22 are joined, as shown in FIGS. The peripheral elastic member 48 is not compressed in the direction along the axial direction of the rotary shaft 12.

  As a result, since the space between the housing 21 and the flange 22 is tightly closed by the peripheral elastic member 48, it is possible to prevent the rainwater flying along with the wind from entering from that time, and the peripheral elastic member Since 48 is not compressed in the axial direction of the rotary shaft 12, rotational vibration and magnetic vibration from the housing 21 are difficult to be transmitted to the flange 22 through the peripheral elastic member 48, and hence through the interposed elastic member 46. Even if the elastic member 48 is provided, there is no problem that transmission of vibration to the flange 22 is promoted due to this. Moreover, since the shape of the peripheral elastic member 48 is simple, even if this peripheral elastic member 48 is adopted, the manufacturing cost of the drive motor 3 does not increase greatly, and the increase in the manufacturing cost can be suppressed. It is.

  On the other hand, as shown in FIGS. 4 and 5, the interposed elastic member 46 is circular with respect to the center point of the through hole 47 between the outer periphery of the flange 22 and the peripheral elastic member 48 in the periphery of the through hole 47. A receiving portion 49 extending along the circumferential direction protrudes along the axial direction of the through hole 47. The receiving portion 49 has an arc shape (fan shape) that is less than a half of a circle, and has a flat surface so that it can be in close contact with the surface of the washer 43. On the other hand, the receiving portion 49 is divided into a plurality of portions 49 a and 49 b by a slit 51 extending along the radial direction of the through hole 47 in this embodiment. However, the receiving part 49 may omit the washer 43 so as to be in close contact with the flange facing surface of the housing 21, and the shape of the receiving part 49 may not be divided into a plurality of parts by the slit 51.

  And the site | part which has the receiving part 49 among the interposition elastic members 46 is more than numerical value S1 of the spring constant of the direction along the rotation direction (radial direction of the rotating shaft 12) of the rotating shaft 12, as FIG. 7 shows. The value S2 of the spring constant in the direction along the axial direction of the rotating shaft 12 is set to be larger.

  Further, motor components that are vibration sources such as the rotor assembly 20 and the rotating shaft 12 are connected only to the housing 21 and not connected to the flange 22.

  As a result, as shown in FIG. 5, the interposed elastic member 46 is attached to the notch 45 of the flange 22, and the protrusion 41 is inserted into the through hole 47 of the interposed elastic member 46, and then the pressing plate 54 is interposed. However, when the screw 44 is connected to the screw hole 42 of the protrusion 41, only the receiving portion 49 of the interposed elastic member 46 is connected to the housing 21 via the protrusion 41 except for the peripheral elastic member 48. The housing 21 and the flange 22 are not directly connected.

  Therefore, the amount of vibration transmitted from the housing 21 to the flange 22 is always damped by the interposed elastic member 46 interposed therebetween, so that the amount of rotational vibration and magnetic vibration transmitted from the housing 21 to the flange 22 is relatively small. It becomes possible to suppress that the flange 22 and by extension the blower case 2 connected with the flange 22 vibrate. For this reason, the noise of the drive motor 3 and the air blowing unit 1 becomes low, and it becomes possible to provide the air blowing unit 1 with high silence. Moreover, since the housing 21 and the flange 22 are basically in contact with each other only at the receiving portion 49 as described above, the contact area between the two is relatively small. Further deterred.

  The blower unit 1 according to the second embodiment will be described with reference to FIGS. However, the same configurations and functions as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and the description thereof is basically omitted.

  As shown in FIGS. 8 and 9, the drive motor 3 according to the second embodiment also includes a rotating shaft 12, a boss housing 21, a stator assembly 18 attached to the outer peripheral surface of the boss housing 21, and a control board 19. The motor body 23 is formed by the rotor assembly 20, the housing 21, and the flange 22.

  The rotating shaft 12 is one of the vibrators, and as shown in FIG. 8, a rotated member such as the multiblade fan 4 is attached by attaching a rotated member such as the multiblade fan 4 to one end thereof. As shown in FIG. 9, the boss housing 21 is rotatably supported via bearings 25 and 26. These boss housing 21 and bearings 25 and 26 are also components constituting the vibrating body.

  A stator assembly 18 is disposed on the outer peripheral surface of the boss housing 21 that extends along the axial direction of the rotary shaft 12. The stator assembly 18 includes an iron core portion and armature windings wound around the side outer peripheral surface of the core portion a plurality of times.

  Further, the rotor shaft 20 is attached to the rotating shaft 12, which is one of the components constituting the vibrating body, on the upper side of the rotating shaft 12 in the axial direction from the stator assembly 18. The rotor assembly 20 faces the stator assembly 18 in a direction along the radial direction of the rotary shaft 12, and the inner surface of the yoke 32 faces the yoke 32 and the armature winding of the stator assembly 18. And a magnet 33 provided in the. The magnet 33 is also a sintered ferrite magnet, for example, as in the first embodiment.

  Furthermore, the drive motor 3 includes a relatively thin plate-like control board 19 on which electronic components that perform control such as switching the current supplied to the armature winding of the stator assembly 18 with an electronic switch are disposed. Have. More specifically, the control board 19 includes a heat dissipation component 35 such as a transistor. The control board 19 is disposed on the lower end side of the stator assembly 18 and the rotor assembly 20 in the direction along the axial direction of the rotary shaft 12 in the second embodiment. The control board 19 is disposed on the bottom side. Further, as shown in FIG. 11A, the control board 19 is formed with a plurality of through holes 55 for connecting to the flanges 22 in an appropriate arrangement.

  The housing 21 extends in the radial direction of the rotary shaft 12 in the vicinity of the end of the rotary shaft 12 on the boss portion 13 side shown in FIG. 8 and is opposite to the boss portion 13 side of the rotary shaft 12. The side opposite to the boss portion 13 is open toward the end on the side, and the overall shape thereof is a substantially open umbrella shape, the first opening on the multi-blade fan 4 side, and the flange It has a cylindrical shape having a second opening on the 22 side. The housing 21 is made of a material having excellent thermal conductivity, for example, a metal such as aluminum.

  The flange 22 is also capable of closing the second opening side of the housing 21 as in the first embodiment, and is made of a resin such as polypropylene (PP) resin. However, the flange 22 may be formed of metal as a material. A columnar portion 56 having an insertion protrusion 56a that can be inserted into the through-hole 55 of the control board 19 at the tip end is provided on the surface of the flange 22 on the recess 39 side as shown in FIG. 11B. It is provided corresponding to the arrangement of 19 through holes 55. Thereby, the control board 19 is supported from below by the flange 22 via the columnar portion 56.

  Therefore, by assembling the housing 21 and the flange 22 to each other, a motor internal space 50 is formed in the drive motor 3 as shown in FIG. The motor internal space 50 according to the second embodiment includes at least the control board 19 and the rotation shaft 12 at an end portion opposite to the boss portion 13 shown in FIG. The stator assembly 18 and the rotor assembly 20 are included.

  Therefore, even in the drive motor 3 according to the second embodiment, since all the parts arranged below the flange 22 in the conventional drive motor are arranged above the flange 22, the flange 22 in the conventional drive motor is arranged. As shown in FIGS. 8B and 9, the lower side of the drive motor 3 has a substantially flat shape, and the blower unit 1 is installed in the duct. In addition, it is possible to avoid the drive motor 3 from protruding outside the duct, and the layout of the drive motor 3 when the blower unit 1 is mounted on a vehicle or the like can be improved. As the drive motor 3 is configured as described above, the dimension H2 (shown in FIG. 8B) along the axial direction of the rotary shaft 12 of the drive motor 3 is set to the lower case of the conventional drive motor. The thickness can be made relatively small.

  Incidentally, as shown in FIG. 9, the housing 21 is cylindrical along the axial direction of the rotary shaft 12 between the first opening on the multiblade fan 4 side and the side peripheral surface of the rotary shaft 12. An annular space 57 extending in the direction is provided, and a seal member 58 is interposed in the annular space 57.

  The sealing member 58 is formed of, for example, nitrile rubber (NBR) or the like and has elasticity. As shown in FIG. 10, the sealing plate 58 has an annular plate-like bottom wall portion 60 having a circular hole 59 in the center. And an outer peripheral wall portion 61 that extends from the outer peripheral edge of the bottom wall portion 60 along the axial direction of the circular hole 59 and contacts the inner peripheral surface of the flange 22 when mounted in the annular space 57. The bottom wall 60 has a shape that is thinned for a while along the axial direction of the circular hole 59 and extends in an oblique direction from the inner peripheral edge of the bottom wall portion 60, and its end in the extending direction is the rotation axis when mounted in the annular space 57. The inner peripheral wall portion 62 is in contact with the 12 side peripheral surfaces. In this embodiment, the sealing member 58 is provided with a leaf spring 63 extending from the outer peripheral wall portion 61 to the bottom wall portion 60.

  As a result, the seal member 58 is mounted between the housing 21 and the rotary shaft 12 with good airtightness and in a state in which the rotary shaft 12 is rotatable. It is possible to prevent water or the like from entering the internal space 50 of the motor from above, and to suppress transmission of magnetic vibration and rotational vibration of the rotating shaft 12 to the housing 21.

  Further, the rotary shaft 12, the boss housing 21, the rotor assembly 20, and the bearings 25 and 26 constituting the vibrating body of the drive motor 3 are integrated as shown in FIG. 9 and 11 (a), a plurality of support portions 66 extending radially outwardly in the radial direction of the rotating shaft 12 are provided, and the extending direction of the support portions 66 is A protrusion 67 extending downward is formed at the tip of the. 9 and 11B, a notch 68 is formed in the flange 22 at a position corresponding to the protrusion 67 of the support portion 66 when the flange 22 is mounted on the housing 21. The mounting elastic member 69 is attached to the notch 68. Further, the mounting elastic member 69 is formed with a through hole 71 into which the protrusion 67 of the support portion 66 can be inserted, and the strip 72 extends radially and linearly from the through hole 71.

  Thereby, the vibration from the rotating shaft 12, the boss housing 21, the rotor assembly 20, and the bearings 25 and 26 constituting the vibrating body of the drive motor 3 is transmitted to the flange 22 through the mounting elastic member 69. The vibration is attenuated by the mounting elastic member 69 and the amount of vibration to the flange 22 can be reduced.

  Furthermore, as shown in FIG. 11A, a connection device 70 having a spring function is provided on the bottom surface side of the control board 18, and the connection board 70 connects the control board 19 and the stator assembly 18 to each other. In addition to securing an electrical path, magnetic vibration and rotational vibration from a rotating body including the rotating shaft 12 are suppressed from being transmitted to the control board 19.

  On the other hand, as shown in FIG. 12, the drive motor 3 may be configured not to have the seal member 58 by combining the housing 21 and the cone portion 14 constituting the rotated member such as the multiblade fan 4. That is, the cone portion 14 is located on the motor inner space 50 side (the other end side in the axial direction of the rotating shaft 12) along the axial direction of the rotating shaft 12 outside the boss portion 13 in the radial direction of the rotating shaft 12. ) Has a cylindrical portion 74 extending toward the top. The housing 21 has a cylindrical portion 75 extending toward the boss portion 13 (one end side in the axial direction of the rotating shaft 12) along the axial direction of the rotating shaft 12. The outer diameter of the cylindrical portion 75 is relatively smaller than the inner diameter of the cylindrical portion 74, while the inner diameter dimension forms a cylindrical space 57 between the rotary shaft 12. The size is possible. The end of the tubular portion 75 on the boss portion 13 side has a through hole 76 through which the rotary shaft 12 can be inserted, and the peripheral edge of the through hole 76 is connected to the rotary shaft 12 along the radial direction of the rotary shaft 12. A flange 77 extending toward the top is formed.

  Thereby, when the driven member such as the multi-blade fan 4 and the drive motor 3 are assembled, the cylindrical portion 75 of the housing 21 is accommodated in the cylindrical portion 74 of the cone portion 14. A space (labyrinth-like space) formed by a portion extending along the axial direction of the rotary shaft 12 and a portion extending along the radial direction of the rotary shaft 12 above the space portion is formed between the cylindrical portions 75. Partitioned. Therefore, it is possible to prevent external moisture from entering the motor internal space 50 from the through-hole 76 and the cylindrical space 57, so that the seal member 58 is unnecessary.

  The embodiment of the invention has been described by taking an outer rotor type motor in which the rotor assembly rotates on the outer periphery of the stator assembly as an example. However, naturally, the rotor assembly rotates on the inner peripheral side of the stator assembly. It is also possible to apply to an inner rotor type motor. Moreover, this drive motor can be used in the ventilation unit of a vehicle air conditioner.

DESCRIPTION OF SYMBOLS 1 Blower unit 2 Blower case 3 Drive motor 4 Multi-blade fan 12 Rotating shaft 13 Boss part 14 Cone part 15 Blade 18 Stator assembly 19 Control board 20 Rotor assembly 21 Housing 22 Flange 46 Interposing elastic member 48 Peripheral elastic member 48a Top portion 49 Receiving portion 50 Motor internal space 57 Circular space 58 Seal member 69 Mounting elastic member 74 Tubular portion 75 Tubular portion 76 Through hole 77 Flange

Claims (5)

A rotational force is transmitted to the rotated member to rotate the rotated member,
A housing having a first opening relatively close to the rotated member and a second opening relatively spaced from the rotated member, and a flange that closes the second opening of the housing. Forming a space,
A rotating shaft that attaches and rotates the member to be rotated causes one end of the rotating shaft in the axial direction to protrude outward from the first opening, and the other end of the rotating shaft in the axial direction extends to the motor. It is mounted on the housing so as to be enclosed in the internal space,
The flange is provided with a peripheral elastic member on a surface facing the second opening of the housing, and the peripheral elastic member is compressed by pressing from a direction along a substantially radial direction of the rotating shaft by the housing. On the other hand, the drive motor is in contact with a portion near the second opening of the outer peripheral surface of the housing so that a compressive force does not act in a direction along the axial direction of the rotating shaft. A bearing portion for rotatably supporting the rotating shaft, a boss housing having a fixing means for holding the bearing portion and fixing to the flange, and rotating together with the rotating shaft attached to the rotating shaft A rotor assembly; a stator assembly that faces the rotor assembly in a direction along a radial direction of the rotating shaft and is arranged not to rotate with the rotating shaft; and control of rotation of the rotating shaft and the rotor assembly Including a control board for performing in the motor internal space,
At least the rotating shaft, the bearing portion, the boss housing, the rotor assembly, and the control board are connected to the housing side to constitute a motor main body,
When closing the second opening side of the housing with the flange, an interposing elastic member having a receiving portion is disposed on the flange, and the receiving portion of the interposing elastic member is on a surface facing the flange side of the housing. The motor main body portion is supported by the receiving portion by surrounding the rotating shaft with the receiving portion by disposing the receiving portion at three or more locations with respect to the interposed elastic member. The drive motor according to claim 1. A rotational force is transmitted to the rotated member to rotate the rotated member,
A housing having a first opening that opens on a side relatively close to the rotated member and a second opening that opens on a side relatively spaced from the rotated member; and the second of the housing A motor internal space is formed with a flange that closes the opening of
A rotating shaft for attaching and rotating the member to be rotated causes one end portion in the axial direction of the rotating shaft to protrude outside from the first opening, and the other end portion in the axial direction of the rotating shaft is used as the motor. It is mounted on the housing so as to be enclosed in the internal space,
A drive motor, wherein a sealing material having an elastic function is interposed in an annular space between the first opening of the housing and the rotating shaft. A rotational force is transmitted to the rotated member to rotate the rotated member,
A housing having a first opening that opens on a side relatively close to the rotated member and a second opening that opens on a side relatively spaced from the rotated member; and the second of the housing A motor internal space is formed with a flange that closes the opening of
A rotating shaft for attaching and rotating the member to be rotated projects one end of the rotating shaft along the axial direction of the rotating shaft to the outside from the first opening, and extends in the direction along the axial direction of the rotating shaft. The other end is mounted on the housing so as to be included in the motor internal space,
The rotating member includes a cone portion having a boss portion to which the rotation shaft is fixed, and the cone portion is the other side in the axial direction of the rotation shaft at a radially outer side of the rotation shaft than the boss portion. A first tubular portion extending toward the end of the
The housing includes a second cylindrical portion that extends toward one end in the axial direction of the rotating shaft and has an outer diameter that is smaller than an inner diameter of the first cylindrical portion. The first opening into which the rotating shaft can be inserted is provided in the cylindrical portion, and a flange is formed by extending a peripheral portion of the first opening toward the rotating shaft,
When the drive motor and the rotated member are assembled, the second cylindrical portion is housed in the first cylindrical portion, and the first cylindrical portion and the second cylindrical portion are A drive motor characterized in that the space defined by is relatively intricately partitioned. A bearing portion for rotatably supporting the rotating shaft, a boss housing having a fixing means for holding the bearing portion and fixing to the flange, and rotating together with the rotating shaft attached to the rotating shaft A rotor assembly; a stator assembly that faces the rotor assembly in a direction along a radial direction of the rotating shaft and is arranged not to rotate with the rotating shaft; and control of rotation of the rotating shaft and the rotor assembly And a control board for carrying out
At least the rotating shaft, the bearing portion, the boss housing, and the rotor assembly are integrated as a vibrating body, and the vibrating body is fixed to the flange via a mounting elastic member. The drive motor according to claim 3 or claim 4.

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