JP2015122930A - Fan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reverse rotation prevention fan motor that runs at a high speed and has durability.SOLUTION: In a fan motor 1 that has high durability even when running at a high speed and that prevents reverse rotation, a fan 5 is attached to a rotating shaft 4 that is supported by two bearings 3 of a motor 2. Within a motor case 6, a rotor 7 attached to the rotating shaft 4, a stator 8, and a reverse rotation prevention clutch 10, which has an outer ring side supported by the rotor 7 and which has an inner ring side supported by a cylindrical clutch guide 9 formed in the motor case 6 in such a shape as to surround an outer periphery of the bearing 3, are provided.

Description

  The present invention relates to a fan motor used for blowing air and having a reverse rotation prevention function.

Conventionally, in this type of fan motor, a fan motor in which a fan is attached to a rotating shaft of the motor and a reverse rotation preventing means is provided on the rotating shaft has been known. (For example, see Patent Document 1)
Hereinafter, the fan motor will be described with reference to FIGS.

  As shown in FIG. 4, the fan motor 101 has a fan 104 attached to a rotating shaft 103 of a motor 102 and the rotating shaft 103 supported by a reverse rotation preventing bearing 105. As shown in FIG. 5, the reverse rotation preventing bearing 105 is configured to hold an outer ring 106 and an inner ring 108 concentrically and rotatably. A plurality of latches 107 are formed on the inner peripheral side of the outer ring 106. A ball 109 is arranged in the latch 107.

  When the inner ring 108 rotates in the forward rotation direction (arrow a direction), the ball 109 moves to the wide space side in the radial direction of the latch 107 and rotates. Conversely, when the inner ring 108 rotates in the reverse rotation direction (the direction opposite to the arrow a), the ball 109 moves to the narrow space side in the radial direction of the latch 107. That is, the latch 107 regulates the behavior of the ball 109, and the inner ring 108 stops rotating. In this way, the rotation of the rotary shaft 103 is allowed only in the direction of arrow a to prevent reverse rotation.

Japanese Utility Model Publication No. 64-11394

  In such a conventional method for preventing reverse rotation of a fan motor, the ball 109 and the inner ring 108 are in contact with each other even if the fan motor is rotating forward. Therefore, there is a problem that the higher the rotation speed, the higher the temperature due to the friction between the inner ring 108 and the ball 109 and the lack of durability at high speed rotation.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a fan motor for preventing reverse rotation that is durable at high speed.

In order to achieve the above object, the fan motor of the present invention is a fan motor in which an impeller is attached to a rotating shaft, and a rotor and a stator are provided in a casing.
The rotor is rotatably supported by the casing via a reverse rotation prevention clutch, and the reverse rotation prevention clutch is provided on the outer peripheral side of the inner ring and the inner ring so as to be concentric with the inner ring. An outer ring provided with a latch, a cylindrical roller provided for each of the plurality of latches, and a spring connecting the latch and the cylindrical roller, and the inner ring is a clutch guide provided in the casing The outer ring is held by the rotor and achieves the intended purpose.

  As described above, the rotor is rotatably supported by the casing via the reverse rotation prevention clutch, and the reverse rotation prevention clutch is provided on the outer ring side of the inner ring and the inner ring so as to be concentric with the inner ring. The outer ring is provided with a plurality of latches on the circumferential side, the cylindrical rollers provided for each of the plurality of latches, and the springs connecting the latches and the cylindrical rollers, and the inner ring is attached to the casing. Since the outer ring is held by the rotor, and the outer ring is held by the rotor, when the rotor rotates at a high speed to the positive rotation side, the outer ring supported by the rotor also rotates at a high speed and The cylindrical roller provided on the rotator also rotates at high speed. Therefore, the cylindrical roller is separated from the inner ring by centrifugal force, and the temperature rise due to friction between the cylindrical roller and the inner ring is eliminated. Therefore, a high-speed rotation and durable reverse rotation prevention fan motor can be obtained.

1 is a side sectional view showing a configuration of a reverse rotation prevention fan motor according to a first embodiment of the present invention. Cross-sectional schematic view of the reverse rotation prevention clutch of the reverse rotation prevention fan motor Schematic showing the forward rotation state of the reverse rotation prevention clutch of the reverse rotation prevention fan motor Side sectional view showing the configuration of a conventional fan motor for preventing reverse rotation Cross-sectional schematic diagram showing the reverse rotation prevention bearing of the reverse rotation prevention fan motor

  The invention according to claim 1 of the present invention is a fan motor in which an impeller is attached to a rotating shaft, and a rotor and a stator are provided in a casing. The rotor can be rotated to the casing via a reverse rotation prevention clutch. The reverse rotation prevention clutch is provided on the outer ring side of the inner ring, concentrically with the inner ring, and includes an outer ring having a plurality of latches on the inner periphery side, and one each of the plurality of latches. A cylindrical roller, a spring connecting the latch and the cylindrical roller, the inner ring is held by a clutch guide provided in the casing, and the outer ring is held by the rotor. is there. With such a configuration, when the rotor rotates at a high speed toward the positive rotation side, the reverse rotation prevention clutch rotates the outer ring supported by the rotor at a high speed, and the cylindrical roller also rotates at a high speed. Since the roller compresses the spring by centrifugal force and separates from the inner ring, the roller has the effect that temperature rise due to friction between the cylindrical roller and the inner ring is eliminated.

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

(Embodiment 1)
As shown in FIG. 1, the fan motor 1 includes a motor 2 and a fan 5 attached to a rotating shaft 4 of the motor 2. The motor 2 includes a motor case 6 serving as a casing, a rotor 7 and a stator 8 incorporated in the motor case 6, and a rotating shaft 4 fixed to the rotor 7. The rotating shaft 4 is supported by two bearings 3 fitted in bearing fitting portions of the motor case 6. The rotating shaft 4 is integrated with the rotor 7 and is rotatable. The motor case 6 is provided with a cylindrical clutch guide 9 that is concentric with the rotating shaft 4 and protrudes inward so as to surround the outer periphery of the bearing 3. An anti-reverse clutch 10 is provided with the rotor 7 supported on the outer ring side and the clutch guide 9 supported on the inner ring side.

  As shown in FIG. 2, the reverse rotation prevention clutch 10 has a plurality of latches 12 formed on the inner peripheral side of the outer ring 11. Each latch 12 is provided with a cylindrical roller 14 connected by a spring 15. In the latch 12, the gap with the inner ring 13 is wider than the diameter of the cylindrical roller 14 in the direction in which the outer ring 11 is reversed. On the other hand, the gap with the inner ring 13 is formed narrower than the diameter of the cylindrical roller 14 in the direction in which the outer ring 11 rotates forward.

The spring 15 has one end fixed to the wide gap between the latch 12 and the inner ring 13, that is, the rear side in the forward rotation direction of the outer ring 11, and the other end connected to the cylindrical roller 14.

  The cylindrical roller 14 disposed between the inner ring 13 and the latch 12 is configured to be pressed against the gap between the inner ring 13 and the latch 12 by a spring 15. That is, the spring 15 is attached so that an elastic force that presses the outer ring 11 forward in the forward rotation direction works. With this configuration, when the outer ring 11 rotates in the reverse direction, the cylindrical roller 14 pushed by the spring 15 moves to the side where the gap between the latch 12 and the inner ring 13 is narrow. Therefore, the cylindrical roller 14 functions as a wedge and prevents reverse rotation. On the other hand, when the outer ring 11 rotates in the forward direction, the cylindrical roller 14 moves to the side where the gap between the latch 12 and the inner ring 13 is wider, so that it can rotate without acting as a wedge.

  As shown in FIG. 3, in the reverse rotation prevention clutch 10, when the rotor 7 rotates at high speed in the forward rotation side, the outer ring 11 supported by the rotor 7 also rotates at high speed, and the cylindrical roller 14 also rotates. Therefore, centrifugal force in the direction indicated by the arrow acts on the cylindrical roller 14, compresses the spring 15, and does not come away from the inner ring 13 and contact. Therefore, the temperature rise due to the friction between the cylindrical roller 14 and the inner ring 13 is eliminated, and the durability at high speed rotation can be improved.

  As shown in FIG. 2, a pocket 16 provided so as to hook the cylindrical roller 14 is formed on the rear side of the latch 12 in the forward rotation side, that is, on the wide side of the gap with the inner ring 13. In other words, the forward rotation side rear end of the latch 12 is provided with a portion protruding toward the forward rotation side front. The pocket 16 has a function of storing the cylindrical roller 14 and securing a gap with the inner ring 13 when the outer ring 11 rotates in the forward rotation direction. Therefore, contact between the cylindrical roller 14 and the inner ring 13 can be prevented, and durability at high speed rotation can be increased.

  It can be used for a rotating body that prevents reverse rotation and requires high-speed rotation.

DESCRIPTION OF SYMBOLS 1 Fan motor 2 Motor 3 Bearing 4 Rotating shaft 5 Fan 6 Motor case 7 Rotor 8 Stator 9 Clutch guide 10 Reverse rotation prevention clutch 11 Outer ring 12 Latch 13 Inner ring 14 Cylindrical roller 15 Spring 16 Pocket 101 Fan motor 102 Motor 103 Rotating shaft 104 Fan 105 Anti-reverse bearing 106 Outer ring 107 Latch 108 Inner ring 109 Ball

Claims (5)

A fan motor having an impeller attached to a rotating shaft and having a rotor and a stator in a casing, wherein the rotor is rotatably supported by the casing via a reverse rotation prevention clutch, and the reverse rotation prevention clutch includes an inner ring An outer ring provided concentrically with the inner ring on the outer peripheral side of the inner ring, and provided with a plurality of latches on the inner peripheral side, a cylindrical roller provided one for each of the plurality of latches, the latch and the cylinder A fan motor that includes a spring that connects the shape rollers, the inner ring is held by a clutch guide provided in the casing, and the outer ring is held by the rotor. The latch is formed such that a gap between the inner ring and the outer ring is narrowed toward the front side in the forward direction of the outer ring, and the front side in the forward direction of the outer ring of the latch is larger than the diameter of the cylindrical roller. Narrow, and the rear side of the outer ring of the latch forms a space wider than the diameter of the cylindrical roller, and one end of the spring is connected to the rear side of the latch of the outer ring in the forward direction. Item 3. The fan motor according to item 1. The fan motor according to claim 2, wherein the spring has an elastic force so as to press the cylindrical roller against the front side in the forward rotation direction of the outer ring. 4. The fan motor according to claim 2, wherein the latch is provided with a pocket for housing the cylindrical roller on the rear side in the forward rotation direction of the outer ring. 5. The said clutch guide is a cylindrical type, Comprising: It is provided so that the said rotating shaft may be enclosed in the inner wall of the said casing, It fits in the inner hole of the said inner ring | wheel, and hold | maintains the said reverse rotation prevention clutch. Fan motor.

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