JP2020200937A - Power transmission structure using pair of one-way clutch and range hood - Google Patents

Abstract

To provide a power transmission mechanism having an entirely new structure which eliminates a need of positioning when a rotating body is attached to a power shaft and enables the rotating body to be attached to or detached from the power shaft.SOLUTION: In a power transmission mechanism of a rotating body, a rotating body is provided with a first one-way clutch and a second one-way clutch which work in power transmission directions opposite to each other. Further, the rotating body is provided in a manner that the rotating body is inserted into or remove from the power shaft through the first one-way clutch and the second one-way clutch. At least one of the first one-way clutch and the second one-way clutch is provided at the rotating body in a manner that the clutch is allowed to move a predetermined distance. The above object is achieved by the power transmission structure of the rotating body.SELECTED DRAWING: Figure 4

Description

The present invention relates to a power transmission structure of a rotating body and a range hood having the power transmission mechanism.

When a rotating body such as a propeller fan, turbo fan, sirocco fan, or grease filter is attached to a power shaft, various types of power transmission structures (non-rotation) have been devised.
One of them is a method of attaching a D-cut to the power shaft as shown in FIG. 4 of Patent Document 1, but when attaching a fan which is a rotating body, the D-cut of the power shaft is adjusted. It could not be installed unless the positions were aligned in the circumferential direction of the power shaft, and it took time and effort to align the positions.

Further, as described in FIG. 5 and paragraph 0016 of Patent Document 2, a pair of protruding portions 10a are provided on the rotating shaft, and the protruding portions 10a are inserted into the rotating shaft insertion hole 8b of the fan. ing.
This is also not easy to align, and even if it is attached, it often causes abnormal noise and noise due to the slight backlash in the structure. If the protrusion 10a and the rotating shaft insertion hole 8b of the fan are tightly fitted in order to prevent abnormal noise and noise, the alignment becomes more difficult and the fan cannot be pulled out.

On the other hand, as described in Patent Document 3, a drive connection method capable of transmitting a driving force in either direction of rotation by providing a pair of forward and reverse one-way clutches and mounting them on a power shaft has been known for a long time. .. This method is a power transmission structure that has never been used in the field of microwave ovens. Further, unlike Patent Document 1 and Patent Document 2, the rotating body can be attached only from a specific direction, and there is an advantage that the rotating body and the power shaft can be attached without being aligned with each other. ..

However, the method of Patent Document 3 is not suitable for a range hood in which a rotating body such as a sirocco fan or a grease filter needs to be removed from the power shaft for regular cleaning.
This is because if the pair of forward and reverse one-way clutches are attached and drive-connected, the members such as rollers constituting the one-way clutch will firmly mesh with the power shaft. For example, if there is only one one-way clutch in the forward direction, the meshing will be loosened by rotating in the opposite direction, but if the drive connection is made with a pair of forward and reverse one-way clutches as in Patent Document 3, the forward direction, It could not be turned in any of the opposite directions, and it was difficult to pull out the power shaft without engaging with the power shaft.
Moreover, in order to insert the one-way clutch into the power shaft, it is necessary to insert the power shaft exactly in the center of the one-way clutch, and the positioning is not easy. Moreover, when the first one-way clutch is inserted through the power shaft, the power shaft can be rotated only in the rotation direction allowed by the first one-way clutch, and the power shaft cannot be moved back and forth and left and right. Therefore, it is more difficult to insert the power shaft into the second one-way clutch.

Japanese Unexamined Patent Publication No. 2008-202579 Patent No. 5298371 Jikkai Sho 61-77423

An object of the present invention is to provide a power transmission mechanism having a completely new structure, which eliminates the need for positioning when the rotating body is mounted on the power shaft and makes it easy to attach and detach the rotating body from the power shaft.

In the first aspect of the present invention, the rotating body is provided with a first one-way clutch and a second one-way clutch whose power transmission directions are opposite to each other, and the power shaft is provided via the first one-way clutch and the second one-way clutch. It is a power transmission structure of a rotating body provided in a removable manner, and at least one one-way clutch of the first one-way clutch and the second one-way clutch is rotated so as to allow a predetermined amount of movement. The problem was solved by adopting a power transmission structure of a rotating body, which is characterized by being provided on the body.

By providing the rotating body with a first-way clutch and a second-way clutch whose power transmission directions are opposite to each other, drive transmission is possible in both the speed increasing direction and the deceleration direction, and the directions of the rotating shaft and the rotating body The rotating body can be driven and connected by simply passing the power shaft through the two-way clutch without the need to match. Moreover, since the clutches in both forward and reverse directions are combined, the motor does not slip in both forward and reverse directions.
In addition, it is not necessary to align the rotating body when it is attached to the power shaft, and it is easy to attach / detach the rotating body from the power shaft.
Further, if the holding member of the one-way clutch is provided with a cushioning material to provide cushioning, it is possible to prevent the clutch from being strongly engaged with the shaft even if a very strong torque is applied to the power shaft.

(A) front view (B) plan view (C) bottom view (D) right side view (E) perspective view seen from the lower right (F) perspective view seen from the upper right of the range hood according to the first embodiment. Perspective view of the range hood according to the first embodiment as viewed from the lower right when the straightening vane is removed. Sectional View of Range Hood According to Example 1 (I-I Section Section of FIG. 1A) Exploded view showing the power transmission structure according to the first embodiment Enlarged view showing the mounting relationship between the second unidirectional clutch and the second unidirectional clutch holding member according to the first embodiment. Partial sectional view of the fan mounted on the power shaft according to the first embodiment. Exploded view showing the power transmission structure according to the second embodiment

<Example 1>
The range hood 1 according to the present invention will be described. FIG. 1 is a plan view, a front view, a bottom view, a right side view, a perspective view seen from the upper right, a perspective view seen from the lower right, and FIG. 2 is a range in the first embodiment. A perspective view seen from the lower right when the straightening vane 7 of the hood 1 is removed, FIG. 3 shows a cross-sectional view of the range hood according to the first embodiment (I-I cross section of FIG.

The range hood 1 has a thin hood 2 having an upper concave inner panel 5 on the inner surface for collecting steam, oily smoke, and the like generated by cooking performed downward or in the surroundings. The hood 2 is connected to a blower box 3 connected to an exhaust duct (not shown) near the communication port 6 located at the rear of the upper part. The blower box 3 has a fan 4 which is a sirocco fan and generates an air flow inside. Therefore, when the fan 4 operates, the communication port 6 becomes a negative pressure, and the air below the inner surface panel 5 is sucked through the communication port 6 and discharged to the outside through the exhaust duct.

A disk-shaped grease filter 8 having a hole for passing air flow and a power shaft 20 connected to the center of the disk of the grease filter 8 by a detachable unit 10 are connected to the communication port 6 by a detachable unit 10, and a motor 81 for rotating the grease filter 8. Is provided.

The air below the inner panel 5 contains oil smoke or the like generated by cooking, and when the fan 4 operates, it exists in the communication port 6, that is, on the flow path of the air flow generated by the fan 4 and is a fan. It is sucked into the hole of the grease filter 8 located on the upstream side of No. 4 and passes through the hole. The grease filter 8 is rotatably provided by the grease filter motor 81. When the range hood 1 operates (normal operation), the fan 4 generates an air flow and the grease filter motor 81 presses the grease filter 8. Rotate. When the grease filter 8 rotates, air passes through the holes, but oil collides with the surface of the grease filter 8. The range hood 1 collects oil contained in air by rotating the grease filter 8.

Since the attachment / detachment unit 10 that connects the grease filter 8 and the power shaft 20 is located directly above the straightening vane 7, when an operator removes the grease filter 8 from the power shaft 20 for cleaning or the like, the straightening vane 7 is first used. Is removed to expose the grease filter 8 as shown in FIG. 2, and then the attachment / detachment unit 10 is operated.
The structure of the range hood 1 is an example, and is not limited to this.

(One-way clutch mounting structure)
FIG. 4 is an exploded view showing a power transmission structure according to the first embodiment. The fan boss 40 is provided with a first-way clutch mounting portion 41 and a second one-way clutch holding portion 42. The fan boss 40 is a member corresponding to a holding portion provided on the rotating body (fan 4), and the first unidirectional clutch 50 and the second unidirectional clutch 60 are held by the fan boss 40.
The first unidirectional clutch 50 and the second unidirectional clutch 60 are provided with rollers 52 and rollers 62 for contacting and driving and connecting to the power shaft 20, respectively, as components of the unidirectional clutch.
On the inner peripheral surface of the first unidirectional clutch mounting portion 41 provided on the fan boss 40, the first unidirectional clutch 50 capable of transmitting power in the positive direction, which is the rotation direction of the power shaft 20 when the fan motor 9 is driven, 50 A plurality of first one-way clutch mounting keys 411 for fixing the clutch are provided. The first-way clutch mounting key 411 is fitted into the first-way clutch key groove 51 provided on the outer peripheral portion of the first-way clutch 50, and the first-way clutch 50 is integrated with the fan boss 40. ..
Therefore, as soon as the power shaft 20 of the fan motor 9 starts rotating, it is driven and connected to the first one-way clutch 50 that transmits power in the forward direction, and the fan 4 starts rotating.

Next, mounting of the second one-way clutch 60 capable of transmitting power in the opposite direction will be described.
A holding member mounting key 421 is provided on the inner peripheral surface of the second unidirectional clutch holding portion 42 provided on the fan boss 40 of the fan 4. A holding member keyway 652, which is a plurality of recesses, is provided on the outer periphery of the second one-way clutch holding member 65. The fan boss 40 and the second unidirectional clutch holding member 65 are loosely attached by fitting the holding member mounting key 421 of the fan boss 40 and the holding member key groove 652 of the second unidirectional clutch holding member 65 with a clearance. A detailed description of this point will be described later.
Further, the second unidirectional clutch holding member 65 is provided with a second unidirectional clutch holding hole 654. A second unidirectional clutch mounting key 651 that fits with the second unidirectional clutch key groove 61 provided on the outer peripheral surface of the second unidirectional clutch 60 is provided on the inner peripheral surface thereof, and the second unidirectional clutch mounting key 651 is provided. The clutch holding member 65 and the second unidirectional clutch 60 are firmly fitted.

After the first unidirectional clutch 50 and the second unidirectional clutch 60 are fitted to the fan boss 40 which is the holding portion, the clutch disengagement washer 70 is attached to the clutch disengagement washer mounting portion 43 provided on the fan boss 40. Will be done.
Further, a retaining ring 80 is provided so as to press the clutch disengagement washer 70 from above, and the retaining ring 80 is fitted into the retaining ring mounting portion 44 of the fan boss 40 so that the two-way clutch (50, The installation of 60) is completed.

(Power transmission of 1st one-way clutch and 2nd one-way clutch)
In the range hood 1, the power shaft 20 of the fan motor 9 is designed exclusively for exhaust gas, and the fan 4 rotates only in the forward direction. When the fan motor 9 is switched on, the power shaft 20 starts rotating and is immediately driven and connected to the first unidirectional clutch 50. After that, when the fan motor 9 is stopped or the high rotation speed is switched to the low rotation speed, the drive connection between the first one-way clutch 50 and the power shaft 20 is broken.
If only the first unidirectional clutch 50 that is driven and connected in the forward direction is provided, the first unidirectional clutch 50 slowly rotates the pedal of the bicycle that has been rowing firmly when the fan 4 is stopped or the rotation speed is lowered. The drive connection is broken and the vehicle does not decelerate easily, as when the pedal is stopped or the pedal is stopped.
In the present invention, at that time, since the second unidirectional clutch 60 and the power shaft 20 that are driven and connected in the opposite directions are driven and connected, the speed is faster than the case where only the first one direction clutch 50 is driven and connected, as operated by the operator. The rotation speed of the fan 4 drops.

(Attachment relationship between the second one-way clutch and the holding member)
See FIG. 5, which is an enlarged view showing the mounting relationship between the second unidirectional clutch 60 and the second unidirectional clutch holding member 65. The height of the second unidirectional clutch 60 is a, and the height of the second unidirectional clutch holding member 65 is also a. The height of the top portion 4211 and the bottom portion of the holding member mounting key 421 is also a.
Since the heights are the same, the second unidirectional clutch 60 fits snugly into the second unidirectional clutch holding member 65 without popping out of the second unidirectional clutch holding hole 654.
On the other hand, the width d of the holding member key groove 652, which is a recess provided on the outer peripheral portion of the second one-way clutch holding member 65, is made larger than the width c of the holding member mounting key 421 provided on the fan boss 40. The clearance is provided by a predetermined amount (dc). Therefore, the second unidirectional clutch 60 is intentionally moved by the clearance in the circumferential direction of the power shaft 20.

(Mounting the fan on the power shaft)
The width of the second unidirectional clutch holding portion 42 is b, and the widths of the second unidirectional clutch holding member 65 and the second unidirectional clutch 60 are designed so that the relationship with a is a <b. That is, there is a gap 90 (ba) between the clutch disengagement washer 70 and the second unidirectional clutch 60 attached to the second unidirectional clutch holding member 65. (See Fig. 6)
Therefore, the second unidirectional clutch 60 integrated with the second unidirectional clutch holding member 65 is intentionally moved by a predetermined amount (ba) by the distance of the clearance 90 in the axial direction of the power shaft 20. There is a clearance in.
FIG. 6 is a partial cross-sectional view of a fan mounted on the power shaft according to the first embodiment, and only a part of the fan 4 is shown. From the motor side, the retaining ring 80, the clutch disengagement washer 70, the gap 90, the second unidirectional clutch 60 held by the second unidirectional clutch holding member 65, and the first unidirectional clutch 50 are provided in this order. I understand.
It can be seen that the gap 90 allows the second unidirectional clutch 60 to move in the axial direction of the power shaft 20 as well.

In addition, the maximum diameter e of the second unidirectional clutch holding member 65 and the maximum diameter f of the second unidirectional clutch holding portion 42 are designed so that e <f. As a result, the second unidirectional clutch holding member 65 is allowed to move freely in the second unidirectional clutch holding portion 42 by a predetermined amount (fe). This movement is a movement in the plane orthogonal to the power axis.

As described above, in the first embodiment, the second unidirectional clutch 60 integrated with the second unidirectional clutch holding member 65 has an in-plane direction orthogonal to the power axis, a power axis direction, a power axis circumferential direction, and power. It is configured so that it can be moved by a predetermined amount in all directions that are oblique to the axial direction.
Assuming that the power axis direction is the z-axis direction, moving by a predetermined amount (ba) in the power axis direction means moving in the z-axis direction.
Moving a predetermined amount (fe) in the plane orthogonal to the power axis means moving in the x-axis direction and the y-axis direction.

As a result, it moves by a predetermined amount in a direction oblique to the power axis direction. That is, moving a predetermined amount in a direction oblique to the power axis direction means moving around the x-axis and the y-axis.
Moving by a predetermined amount (dc) in the circumferential direction of the power axis means moving around the z-axis.

In summary, the second unidirectional clutch 60 can move a predetermined amount in the x-axis direction, the y-axis direction, and the z-axis direction, so that the space in which the second unidirectional clutch 60 can move is one size larger than that of the second unidirectional clutch 60. It becomes a cylindrical space. Among them, since the second unidirectional clutch 60 can move freely and change its direction, the upper surface and the bottom surface of the second unidirectional clutch 60 are inclined obliquely, that is, in the direction of the power axis. On the other hand, it can be moved diagonally.
By moving the second one-way clutch 60 in a direction oblique to the power shaft direction, it becomes easier to put the clutch 60 into the power shaft 20.

Further, in the above-described embodiment, a space is provided to move a predetermined amount.
It can also be configured to directly move the second unidirectional clutch 60 in a direction oblique to the power axis without providing a space.
For example, a spherical sliding bearing is provided in the fan boss 40, and a rotation stopper that fits the spherical surface of the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring is provided to stop the inner ring from rotating, and the outer peripheral surface of the inner ring is provided with respect to the inner peripheral surface of the outer ring. The second unidirectional clutch 60 may be fitted inside the inner ring so that the spherical surface can be moved in a direction oblique to the power axis direction.

When mounting the fan 4 on the power shaft 20, the fan 4 is held, and the second unidirectional clutch 60 located closest to the motor 9 side of the fan at the time of mounting is inserted into the power shaft 20. Since the second one-way clutch 60 can freely change its direction and move by a predetermined amount, it is easy to put it in the power shaft 20.
Next, the power shaft 20 is inserted into the first one-way clutch 50. As described above, the second one-way clutch 60 can freely change its direction and move by a predetermined amount. It is very easy to install the one-way clutch 50 toward the center.

In the first embodiment, as described above, the second unidirectional clutch 60 first inserted into the power shaft 20 is allowed to move by a predetermined amount, but the first unidirectional clutch 50 is moved by a predetermined amount. It does not prevent you from doing so. In this case, even if the power shaft 20 is inserted in the center of the second unidirectional clutch 60 and then tried to be inserted into the first unidirectional clutch 50, the end of the roller 52 which is a component of the first unidirectional clutch 50 May hit the power shaft 20, making it difficult to insert. Since the first unidirectional clutch 50 is configured to move by a predetermined amount, when the power shaft 20 is inserted, the power shaft 20 is naturally accepted by the first unidirectional clutch 50.

The clearance described above does not affect the drive connection of the second unidirectional clutch 60 with the power shaft 20. When the second unidirectional clutch 60 is driven and connected to the power shaft 20, a recess (holding member key groove 652) provided on the outer peripheral portion of the holding member mounting key 421 provided on the fan boss 40 and the second unidirectional clutch holding member 65 is provided. This is because the side wall of) rotates by the amount of the clearance, comes into contact with it, and is pressed by the driving force, so that it does not move after that.

(Engagement of power shaft and bidirectional clutch)
(Cushioning material provided on the second one-way clutch holding member)
FIG. 5 shows that the cushioning material 653 is provided in places on the side wall of the holding member keyway 652 of the second unidirectional clutch holding member 65.
As described above, in order to disengage the power shaft 20 from the power shaft 20 in which the first one-way clutch 50 in the forward direction is engaged, the power shaft 20 is rotated in the opposite direction to loosen the engagement and disengage. Similarly, in order to disengage the second unidirectional clutch 60 in the opposite direction from the power shaft 20, it is necessary to rotate the power shaft in the forward direction.
However, both the first unidirectional clutch 50 and the second unidirectional clutch 60 provided on the fan boss 40 of the fan 4 firmly engage the power shaft 20 so that the power shaft 20 can rotate in either the forward or reverse direction. It may disappear. In such a state, it becomes difficult to pull out the power shaft 20 from the fan 4.
Such biting is caused by the fact that a strong torque is instantaneously applied to the one-way clutch. In order to prevent biting, in the second unidirectional clutch holding member 65 in which the second unidirectional clutch 60 is mounted, a cushioning material 653 is provided on the side wall of the holding member keyway 652. Even if a strong torque is instantaneously applied to the second one-way clutch 60, the holding member mounting key 421 provided on the fan boss 40 hits the cushioning material 653, and the impact can be absorbed to prevent biting.
Further, the second unidirectional clutch 60 integrated with the second unidirectional clutch holding member 65 is provided with a clearance that moves a predetermined amount (dc) in the circumferential direction of the power shaft 20 as described above. When the second unidirectional clutch 60 is driven and connected, the second unidirectional clutch holding member 65 rotates by the clearance, and the holding member mounting key 421 provided on the fan boss 40 on the side wall of the holding member key groove 652. When hitting, an impact sound may be generated. The cushioning material 653 also has an effect of preventing the generation of this impact sound.

In the first embodiment, as compared with the first one-way clutch 50 that is driven and connected in the forward direction to transmit the power of the fan motor 9, a cushion is provided on the second one-way clutch 60 side that is driven and connected in the opposite direction in which a large torque is less likely to be applied. Material 653 was attached.
However, it does not prevent the cushioning material from being provided in the first one-way clutch 50 that is driven and connected in the forward direction. Since the first-way clutch 50 applies a larger torque, biting is more likely to occur, and there is also an advantage in providing a cushioning material on the first-way clutch 50 side.
In any case, if at least one one-way clutch is not strongly engaged with the power shaft 20, the fan 4 can be easily pulled out from the power shaft 20.

<Modification 1 of Example 1>
In the first embodiment, the holding member mounting key 421 is provided on the inner peripheral surface of the fan boss 40, and the fan boss 40 and the second one-way clutch are fitted into the holding member key groove 652 of the second one-way clutch holding member 65. The mode was such that the holding member 65 was loosely attached.
In this embodiment, the holding member mounting key 421 of the metal fan boss 40 and the holding member key groove 652 of the second unidirectional clutch holding member 65 to which the cushioning material is mounted collide with each other. Therefore, in order to improve the shock absorption performance, instead of directly fitting the second unidirectional clutch holding member 65 into the metal fan boss 40, a resin annular member provided with a holding member mounting key 421 on the inner peripheral surface. May be fitted into the fan boss 40.
In this way, the metal fan boss 40, the resin annular member, the second unidirectional clutch holding member 65 with the cushioning material, and the second unidirectional clutch 60 are arranged in this order from the outside. Further, since a large torque is not applied in the reverse direction, the second one-way clutch holding member 65 can be made of resin.

<Modification 2 of Example 1>
In the first embodiment, the second unidirectional clutch 60 was fitted into the second unidirectional clutch holding portion 42 of the fan boss 40 via the second unidirectional clutch holding member 65. As a modification 2, the second unidirectional clutch holding member 65 may be omitted, and the second unidirectional clutch 60 may be provided on the second unidirectional clutch holding portion 42 so as to allow the second unidirectional clutch 60 to move directly by a predetermined amount.

<Example 2>
FIG. 7 is an exploded view showing the power transmission structure according to the second embodiment. The attachment of the first one-way clutch 50 to the fan boss 40 is the same as that of the first embodiment, but the attachment of the second one-way clutch 60 is different from that of the first embodiment. A second unidirectional clutch holding member 66 made of a flexible material provided with a large number of flexible protrusions is fitted on the inner peripheral surface of the fan boss 40. A second unidirectional clutch mounting key 651 is provided on the inner peripheral surface of the second unidirectional clutch holding member 66 formed of the flexible material, and is provided on the outer peripheral surface of the second unidirectional clutch 60. The second unidirectional clutch 60 is fixed by fitting the second unidirectional clutch keyway 61.
Since the second unidirectional clutch 60 is held by the second unidirectional clutch holding member 66 made of a flexible material, the second unidirectional clutch 60 is allowed to move by a predetermined amount.
<Modified example of Example 2>
The second unidirectional clutch holding member 66 made of a flexible material is a flexible material or structure that can drive and connect the second unidirectional clutch 60 in the opposite direction and allows a predetermined amount of movement. It doesn't matter what it is.
For example, it may be made of a material having closed cells such as a sponge.

As shown in the above examples and modifications, the power transmission structure is provided with the first one-way clutch 50 and the second one-way clutch 60 whose power transmission directions are opposite to each other, and is a novel type that is easy to attach and detach. A power transmission structure is provided.

1 Range hood 2 Hood 3 Blower box 4 Fan 5 Inner panel 6 Communication port 7 Rectifier plate 8 Grease filter 9 Fan motor 10 Detachable unit 20 Power shaft 40 Fan boss (holding part)
41 1st unidirectional clutch mounting part 411 1st unidirectional clutch mounting key 42 2nd unidirectional clutch holding part 421 Holding member mounting key 4211 Top 43 Clutch disengagement washer mounting part 44 Retaining ring mounting part 50 1st unidirectional clutch ( Positive direction)
51 1st direction clutch Keyway 52 Roller 60 2nd direction clutch (reverse direction)
61 2nd unidirectional clutch keyway 62 Roller 65 2nd unidirectional clutch holding member 651 2nd unidirectional clutch mounting key 652 Holding member keyway (recess)
653 Cushioning material 654 Second unidirectional clutch holding hole 66 Second unidirectional clutch holding member 70 made of flexible material Clutch retaining washer 80 Retaining ring 81 Grease filter motor 90 Gap

Claims (8)

The rotating body is provided with a first one-way clutch and a second one-way clutch whose power transmission directions are opposite to each other, and is detachably provided on the power shaft via the first one-way clutch and the second one-way clutch. It is a power transmission structure of
A power transmission structure for a rotating body, characterized in that at least one of the first one-way clutch and the second one-way clutch is provided on the rotating body so as to allow a predetermined amount of movement. .. The one-way clutch at least one of the first one-way clutch and the second one-way clutch is attached to a holding portion provided on the rotating body via a one-way clutch holding member so as to allow a predetermined amount of movement. The power transmission structure for a rotating body according to claim 1, wherein the rotating body is provided. The one-way clutch holding member is
It has a holding hole for holding the one-way clutch inside, and a plurality of recesses are provided on the outer periphery.
The holding portion provided on the rotating body has a holding portion.
A fitting convex portion that fits into the concave portion of the outer peripheral portion of the one-way clutch holding member with a clearance is provided on the inner peripheral portion of the holding portion provided on the rotating body, and the one-way clutch holding member is moved by the predetermined amount. The power transmission structure according to claim 2, wherein the one-way clutch holding member is fitted so as to allow it. Claims 1 to 3 in which the direction of moving the predetermined amount is at least one of an in-plane direction orthogonal to the power axis, a power axis direction, a power axis circumferential direction, and a direction oblique to the power axis direction. The power transmission structure according to any one of the above items. Claims 2 to 2 in which a cushioning material is provided on the side wall of the concave portion of the outer peripheral portion of the outer peripheral portion of the one-way clutch member and / or the fitting convex portion of the appropriate portion of the holding portion provided on the rotating body. The power transmission structure according to any one of 4. The power transmission structure according to any one of claims 2 to 5, wherein the one-way clutch holding member is made of a flexible material so as to allow movement by the predetermined amount. The power transmission structure according to any one of claims 1 to 6, wherein the rotating body is a fan or a filter. A range hood having the power transmission structure according to any one of claims 1 to 7.

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