JP2010270843A - Motor and electric generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the rotation efficiency of a rotating shaft in a motor and an electric generator. <P>SOLUTION: The motor or electric generator includes bearings 11 and 12 disposed respectively on both side parts of a rotor 8 of a rotating shaft 7. Each of the bearings 11 and 12 includes an inner ring 13 integrated to the outer circumference of the rotating shaft 7, an outer ring 15 disposed on the outer circumference of the inner ring 13 through a plurality of rolling elements 14, a ring-like retainer 16 holding the plurality of rolling elements 14 between the inner ring 13 and the outer ring 15, and a ring-like shield 19 disposed in an opening between the inner ring 13 and the outer ring 15. The inner circumferential side of the shield 19 of the bearing 11 is fixed to the inner ring 13 with the outer circumferential side thereof being a free end without contact to the outer ring 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a motor and a generator.

  The motor and generator are configured as follows.

  That is, a rotating shaft, a rotor integrated on the outer periphery of the rotating shaft, a stator disposed in proximity to the outer periphery of the rotor in a non-contact state, and both side portions of the rotor of the rotating shaft, And arranged bearings. The bearing includes an inner ring integrally fixed to the outer periphery of the rotating shaft, an outer ring disposed on the outer periphery of the inner ring via a plurality of rolling elements, and a ring that holds the plurality of rolling elements between the inner ring and the outer ring. -Shaped retainer. Further, at least one of the bearings has a configuration in which one end is held by the outer ring and the other end has a contact-type seal that contacts and slides with the inner ring (for example, Patent Document 1 below).

  As for the bearing, a configuration is also known in which one end is held by an outer ring and the other end has a seal that is not in contact with the inner ring.

JP 2004-60514 A

  In the above conventional example, the seal provided on the bearing is held and fixed on the outer ring side, and is in contact with and sliding on the inner ring side. Further, as the operation progresses, the seal is worn, gradually forming a gap, and dust and dust enter.

  Further, in a seal that is not in contact with the inner ring, dust or the like enters through the gap.

  There has been a problem that dust or the like that has entered the bearing causes deterioration of the grease provided in the bearing to increase the rotational load, resulting in a decrease in rotational efficiency.

  In view of the above, an object of the present invention is to suppress an increase in the rotational load of the rotating shaft.

  In order to achieve this object, the motor or generator of the present invention includes a rotating shaft, a load connected to one end of the rotating shaft, a rotor integrated on the outer periphery of the rotating shaft, A stator that is arranged close to the outer periphery in a non-contact state and integrated with a motor jacket, and bearings that are respectively arranged on both sides of the rotor of the rotating shaft, An inner ring integrated on the outer periphery of the rotating shaft, an outer ring disposed on the outer periphery of the inner ring via a plurality of rolling elements, and a ring holding the plurality of rolling elements between the inner ring and the outer ring And a ring-shaped shield disposed in an opening between the inner ring and the outer ring, the shield having an inner peripheral side fixed to the inner ring and an outer peripheral side being in non-contact with the outer ring This is the free end of this Accordingly, it is intended to achieve the intended purpose.

  As described above, the motor or the generator of the present invention includes a rotating shaft, a load connected to one end of the rotating shaft, a rotor integrated on the outer periphery of the rotating shaft, and the rotor on the outer periphery of the rotor. And a stator arranged in a non-contact state and integrated with a motor jacket, and bearings arranged on both sides of the rotor of the rotating shaft, respectively. An inner ring integrated on the outer periphery, an outer ring disposed on the outer periphery of the inner ring via a plurality of rolling elements, and a ring-shaped cage holding the plurality of rolling elements between the inner ring and the outer ring, A ring-shaped shield disposed in an opening between the inner ring and the outer ring, the shield having an inner peripheral side fixed to the inner ring and an outer peripheral side being a free end in a non-contact state with the outer ring Therefore, the rotational efficiency can be improved. Can.

  That is, in the present invention, the inner peripheral side of the ring-shaped shield disposed in the opening between the inner ring and the outer ring of the bearing is fixed to the inner ring, and the outer peripheral side is a free end in a non-contact state with the outer ring. Therefore, the shield and the rotating shaft do not come into contact with each other, and as a result, the rotational load does not increase and the rotational efficiency can be improved.

  In addition, since the shield has an arcuate cross-sectional shape, when the rotating shaft rotates, the gap between the outer ring and the outer ring is reduced by opening it outward with centrifugal force. Etc. can be suppressed.

  Furthermore, since the shield has an arcuate cross-sectional shape, pressure is generated toward the outer periphery of the shield when the rotary shaft rotates, so that intrusion of dust from the outside can be suppressed. .

The perspective view which shows one Embodiment of this invention Sectional view Enlarged sectional view of the main part 3 is an enlarged cross-sectional view of the main part of FIG. 3 is an enlarged cross-sectional view of the main part of FIG. Perspective view of the bearing Perspective view of cage of the bearing

  Hereinafter, an embodiment in which the present invention is applied to a blower motor will be described with reference to the accompanying drawings.

  1 and 2 show the blower motor of this embodiment. A suction port 2 is provided on the lower surface of the main body case 1, a discharge port 3 is provided on the side surface of the main body case 1, and A motor 4 is attached to the upper surface.

  Further, a centrifugal fan 5 is provided in the main body case 1, and a lower end of the rotating shaft 7 of the motor 4 is passed through a circular shaft support portion 6 provided in a substantially central shaft portion thereof. The centrifugal fan 5 is attached to the lower end portion of the rotating shaft 7 in a substantially fixed state (including detachable if necessary).

  As shown in FIGS. 2 and 3, the motor 4 includes a rotating shaft 7, a rotor 8 integrated with the outer periphery of the rotating shaft 7, and an outer periphery of the rotor 8 that is not in contact with the rotor 8. A stator 10 that is closely arranged in a state and integrated with a molded resin body 9 and bearings 11 and 12 that are arranged on both sides of the rotor 8 of the rotating shaft 7 are arranged.

  A centrifugal fan 5 is fixed to the rotary shaft 7, and if the stator 10 is energized to rotate the rotary shaft 7, the centrifugal fan 5 is rotated to rotate the suction port 2 into the main body case 1. The air is sucked into the air and then discharged from the discharge port 3.

  As shown in FIG. 3, the bearings 11 and 12 have ring-shaped inner rings 13a and 13b integrated on the outer periphery of the rotating shaft 7, and a plurality of rolling elements 14a and 14b on the outer periphery of the inner rings 13a and 13b. Ring-shaped outer rings 15a, 15b arranged between the inner rings 13a, 13b and the outer rings 15a, 15b, ring-shaped cages 16a, 16b holding the rolling elements 14a, 14b, and the inner rings A ring-shaped shield 19 is provided between the first openings 17a and 17b on the centrifugal fan 5 side and the second openings 18a and 18b on the anti-centrifugal fan side between the outer rings 15a and 15b. I have.

  As shown in FIGS. 4 and 5, the inner end of the shield 19 is fixed to the inner ring 13, and the outer end of the shield 19 is close to the outer ring 15, but is not in contact with the outer ring 15. It is arranged with.

  Specifically, as shown in FIG. 5, the shield 19 has an arcuate cross-sectional shape. In FIG. 5, the broken line indicates the rotation axis 7 before the rotation, and the solid line indicates the rotation axis 7 when it rotates. .

  In other words, the shield 19 is made of a thin metal plate having an arcuate cross section, and its inner end is fixed to the inner ring 13 as described above. As the end side spreads outward, it is deformed from a broken line to a solid line.

  As shown in FIGS. 3 to 5, the bearing 11 on the centrifugal fan 5 side is provided with a cylindrical bearing bracket 20 that is fixed to the molded resin body 9 that covers the stator 10. The cylindrical portion covers the outer periphery of the outer ring 15a of the bearing 11. A through hole 21 is provided in the top of the bearing bracket 20, and the rotary shaft 7 is passed through the through hole 21.

  Further, in the outer peripheral portion of the through hole 21, a portion between the free end of the shield 19 and the outer ring 15a is sandwiched between the top of the bearing bracket 20 and the outer ring 15 as shown in FIGS. 22 is provided in a non-contact state with the shield 19.

  In the above configuration, when the stator 10 is energized, the rotor 8 rotates together with the fan, whereby the air sucked from the suction port 2 of the main body case 1 is discharged from the discharge port 3.

  At this time, both ends of the rotating shaft 7 are rotatably supported by the bearings 11 and 12 as described above.

  In this state, as shown in FIG. 3, the bearing 11 on the centrifugal fan 5 side is not covered with the mold resin body 9 as shown in FIGS. 3 to 5, so that dust enters from the centrifugal fan 5 side. There is a fear.

  However, as can be understood from FIGS. 4 and 5, the intrusion path is between the free end of the shield 19 and the outer ring 15 a, but this part is also covered by the top of the bearing bracket 20. Since the intrusion route becomes long, it becomes difficult to enter.

  In the present embodiment, as described above, the shield 19 is formed of a thin metal plate having an arcuate cross-sectional shape, and the inner periphery thereof is fixed to the inner ring 13 as described above. Then, a centrifugal force is received, and the free end side spreads outward as shown in FIG. 5 so that the line is deformed from a broken line to a solid line. As a result, dust becomes more difficult to enter.

  Further, as described above, the shield 19 made of a thin metal plate having an arcuate cross-sectional shape receives a centrifugal force when the rotating shaft 7 rotates during rotation, and pressure is generated toward the outer peripheral side of the shield 19. Therefore, intrusion of dust from the outside can be suppressed.

  Furthermore, in the present embodiment, as shown in FIGS. 4 and 5, the outer ring 15 is provided with a recess 23 facing the shield 19 toward the outside of the bearings 11 and 12, and the space in the recess 23 is shielded. Since the 19 free ends are stored, the space between the free end of the shield 19 which is a dust intrusion path and the outer ring 15 is narrowed. As a result, the dust is more difficult to enter.

  Furthermore, in this embodiment, as shown in FIGS. 5 to 7, a plurality of storage portions 24 opened at one end of the cage 16 are provided, and the rolling elements 14 are stored in the respective storage portions 24, so that the counter-opening portions 25 are provided. Since the ring-shaped cage 16 is disposed between the inner ring 13 and the outer ring 15 with the side facing the centrifugal fan 5, the rear side immediately between the free end of the shield 19 and the outer ring 15, which is a dust entry path. In addition, the presence of the ring-shaped cage 16 increases the inflow resistance of dust and makes it more difficult to enter.

  Furthermore, in this embodiment, as shown in FIGS. 4 to 7, the wide portion 26 is integrally formed on the side opposite to the opening 25 of the cage 16, and the wide portion 26 provided on the side opposite to the opening 25 serves as a shield for the outer ring 15. 19 is stored in the recess 23 provided toward the outside of the bearings 11 and 12 at a position facing the bearing 19, so that the space between the free end of the shield 19 and the outer ring 15 as a dust intrusion path is narrowed. Dust is more difficult to penetrate.

  Furthermore, in order to make it easy to make the wide portion 26, the cage 16 is made of synthetic resin.

  Furthermore, in the present embodiment, as described above, the bearing sheet 22 sandwiched between the top of the bearing bracket 20 and the outer ring 15a is provided in a non-contact state with the shield 19, so that the dust intrusion path becomes complicated and the inflow It can increase resistance and make it more difficult to penetrate.

  In the present embodiment, as shown in FIG. 3, the rotary shaft 7 on the opposite side of the centrifugal fan 5 is not exposed from the mold resin body 9, so that the bearing 12 on the opposite side of the centrifugal fan 5 is molded. It will be covered with the resin body 9, and it will become difficult for dust to enter from the centrifugal fan 5 side.

  Furthermore, in the present embodiment, as shown in FIGS. 3, 6, and 7, the bearing 12 on the opposite side of the centrifugal fan 5 is provided with a plurality of storage portions 24 that are open on one end side of the cage 16 b. In the state where the rolling element 14b is housed in this state, the ring-shaped retainer 16b is disposed between the inner ring 13b and the outer ring 15b with the counter-opening 25 side facing the centrifugal fan 5 side. The presence of the ring-shaped cage 16b immediately behind the free end of the shield 19 that is the path and the outer ring 15b increases the inflow resistance of dust and makes it less likely to enter.

  In the above embodiment, since the present invention is applied to a motor, a load (not shown) to be rotationally driven is connected to the rotating shaft 7, but the present invention is applied to a generator. In this case, a driving body for rotationally driving the rotary shaft 7 is connected to generate power.

  That is, the present invention can be effective for both a motor and a generator.

  As described above, the motor or the generator of the present invention includes a rotating shaft, a load connected to one end of the rotating shaft, a rotor integrated on the outer periphery of the rotating shaft, and the rotor on the outer periphery of the rotor. And a stator arranged in a non-contact state and integrated with a motor jacket, and bearings arranged on both sides of the rotor of the rotating shaft, respectively. An inner ring integrated on the outer periphery, an outer ring disposed on the outer periphery of the inner ring via a plurality of rolling elements, and a ring-shaped cage holding the plurality of rolling elements between the inner ring and the outer ring, A ring-shaped shield disposed in an opening between the inner ring and the outer ring, the shield having an inner peripheral side fixed to the inner ring and an outer peripheral side being a free end in a non-contact state with the outer ring. Improve rotational efficiency It is possible.

  That is, in the present invention, the inner peripheral side of the ring-shaped shield disposed in the opening between the inner ring and the outer ring of the bearing is fixed to the inner ring, and the outer peripheral side is a free end in a non-contact state with the outer ring. Therefore, the shield and the rotating shaft do not come into contact with each other, and as a result, the rotational load does not increase and the rotational efficiency can be improved.

  In addition, since the shield has an arcuate cross-sectional shape, when the rotating shaft rotates, the gap between the outer ring and the outer ring is reduced by opening it outward with centrifugal force. Etc. can be suppressed.

  Therefore, it is widely used for various electronic devices, automobiles, trains, and the like.

DESCRIPTION OF SYMBOLS 1 Main body case 2 Suction port 3 Discharge port 4 Motor 5 Centrifugal fan 6 Shaft support 7 Rotating shaft 8 Rotor 9 Mold resin body 10 Stator 11 Bearing 12 Bearing 13 Inner ring 13a Inner ring 13b Inner ring 14 Rolling body 14a Rolling body 14b Outer ring 15b 15a outer ring 15b outer ring 16 retainer 16a retainer 16b retainer 17 opening 17a opening 17b opening 18 opening 18a opening 18b opening 19 shield 20 bearing bracket 21 through hole 22 bearing seat 23 recess 24 storage part 25 opposite opening part 26 wide opening part

Claims (20)

A rotating shaft, a load connected to one end of the rotating shaft, a rotor integrated with the outer periphery of the rotating shaft, and the outer periphery of the rotor are arranged in close contact with the rotor in a non-contact state, and placed on the motor jacket And a stator disposed on both sides of the rotor of the rotating shaft, and the bearing is integrated with an inner ring integrated with an outer periphery of the rotating shaft, and an outer periphery of the inner ring. An outer ring arranged via a plurality of rolling elements, a ring-shaped cage holding the plurality of rolling elements between the inner ring and the outer ring, and a ring arranged in an opening between the inner ring and the outer ring The shield is a motor whose inner peripheral side is fixed to the inner ring and whose outer peripheral side is a free end in a non-contact state with the outer ring. The motor according to claim 1, wherein the shield has an arcuate cross-sectional shape. 3. The motor according to claim 1, wherein the outer ring is provided with a recess facing the outside of the bearing at a position facing the shield, and the free end of the shield is stored in the recess space. The ring-shaped cage of the bearing disposed on the load side is provided with a plurality of storage portions that are open on one end side, and the rolling element is stored in each storage portion, and the non-open side is the load side The motor according to claim 1, wherein the ring-shaped cage is disposed between the inner ring and the outer ring. The motor according to claim 1, wherein the rotation shaft on the side opposite to the load is not exposed to the outside of the motor jacket. The ring-shaped cage of the bearing disposed on the anti-load side is provided with a plurality of storage portions opened at one end side, and the rotor is disposed on the counter-open side in a state where the rolling elements are stored in the storage portions. The motor according to claim 1, wherein the ring-shaped cage is disposed between the inner ring and the outer ring on the side. The motor according to claim 1, wherein a wide portion is integrally formed on the side opposite to the opening of the cage. The motor according to claim 1, wherein the outer ring side of the wide part of the cage is stored in a recessed space of the outer ring. The motor according to any one of claims 1 to 8, wherein the cage is formed of a synthetic resin. The bearing disposed on the load side holds the outer ring with a cylindrical cylindrical bearing holding portion, and the bearing holding portion is provided with a through hole, and the rotating shaft passes through the through hole. The portion between the free end of the shield and the outer ring at the outer peripheral portion of the through-hole is provided with a bearing sheet sandwiched between the top and the outer ring in a non-contact state with the shield. The motor as described in any one. A rotating shaft, a load connected to one end of the rotating shaft, a rotor integrated with the outer periphery of the rotating shaft, and the outer periphery of the rotor are arranged in close contact with the rotor in a non-contact state, and placed on the motor jacket. And a stator disposed on both sides of the rotor of the rotating shaft, and the bearing is integrated with an inner ring integrated with an outer periphery of the rotating shaft, and an outer periphery of the inner ring. An outer ring arranged via a plurality of rolling elements, a ring-shaped cage holding the plurality of rolling elements between the inner ring and the outer ring, and a ring arranged in an opening between the inner ring and the outer ring A generator having an inner peripheral side fixed to the inner ring, and the outer peripheral side being a free end in a non-contact state with the outer ring. The generator according to claim 11, wherein the shield has an arcuate cross-sectional shape. The generator according to claim 11 or 12, wherein the outer ring is provided with a recess facing the outside of the bearing at a location facing the shield, and the free end of the shield is stored in the recess space. The ring-shaped cage of the bearing disposed on the load side is provided with a plurality of storage portions that are open on one end side, and the rolling element is stored in each storage portion, and the non-open side is the load side The generator according to any one of claims 11 to 13, wherein the ring-shaped cage is disposed between the inner ring and the outer ring. The generator according to claim 11, wherein the rotation shaft on the opposite load side is not exposed to the outside of the motor jacket. The ring-shaped cage of the bearing disposed on the anti-load side is provided with a plurality of storage portions opened at one end side, and the rotor is disposed on the counter-open side in a state where the rolling elements are stored in the storage portions. The generator according to any one of claims 11 to 15, wherein the ring-shaped cage is disposed between the inner ring and the outer ring on the side. The generator according to any one of claims 11 to 16, wherein a wide portion is integrally formed on the side opposite to the opening of the cage. The generator according to any one of claims 11 to 17, wherein the outer ring side of the wide part of the cage is stored in a recessed space of the outer ring. The generator according to any one of claims 11 to 18, wherein the cage is made of a synthetic resin. The bearing disposed on the load side holds the outer ring with a cylindrical cylindrical bearing holding portion, and the bearing holding portion is provided with a through hole, and the rotating shaft passes through the through hole. The portion between the free end of the shield and the outer ring at the outer peripheral portion of the through hole is provided with a bearing seat sandwiched between the top and the outer ring in a non-contact state with the shield. The generator as described in any one.

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