JP7385239B2 - Power transmission structure using one-way clutch - Google Patents

Description

The present invention relates to a power transmission structure and a range hood having the power transmission structure.

When attaching rotating bodies such as propeller fans, turbo fans, sirocco fans, and grease filters to the power shaft, various types of power transmission structures (rotation prevention) have been devised.
One method is to make a D-cut on the power shaft, as described in Figure 4 of Patent Document 1, but when installing a fan, which is a rotating body, in accordance with the D-cut on the power shaft, It cannot be installed unless the position is aligned in the circumferential direction of the power shaft, and alignment is time-consuming.
As shown in FIGS. 4 and 5 of Patent Document 2, a method is often used in which a drive pin is press-fitted into a power shaft and engaged with an engagement groove provided in a fan boss of a fan that is a rotating body. It is being This method also requires alignment between the drive pin of the power shaft and the engagement groove of the fan boss, and also has slight structural play, which often causes abnormal sounds and noise. Furthermore, if the engagement is tightened to eliminate play in order to prevent abnormal sounds and noises, not only is it necessary to perform precise positioning, but there is also the problem that it becomes difficult to remove.
Patent Document 3 describes a mechanism for attaching a power shaft to a blade. A pin, which is an engager, is attached to the power shaft in the middle. On the other hand, on the blade side, a washer-like contact plate made of rubber or soft plastic is attached to a metal plate. A pin provided on the power shaft presses against a contact plate provided on the blade so that the pin provided on the power shaft bites into it, thereby fixing the blade and the power shaft.

Japanese Patent Application Publication No. 2008-202579 JP 2016-40492 Publication Publication No. 47-3491

Until now, various methods of attaching a rotating body to a power shaft have been proposed, as in Patent Documents 1 to 3.
However, in the systems of Patent Document 1 and Patent Document 2, it is not easy to align the rotating body and the power shaft, and abnormal sounds and noises may occur.
Furthermore, in the method of Patent Document 3, the fan can be attached not only in the direction of the power shaft, but because the strong torque of the motor is applied to the contact plate made of plate-shaped rubber or soft plastic, The disadvantage was that the parts deteriorated rapidly, and parts had to be replaced when deterioration occurred.
In particular, range hoods include rotating bodies such as a sirocco fan for exhausting air and a grease filter for collecting oil smoke and the like. These rotating bodies are rotated by a motor to recover the exhaust gas and the oil contained in the exhaust gas.
Rotating bodies such as sirocco fans and grease filters are prone to oil and the like from oil smoke generated during cooking, so they require periodic cleaning. Therefore, ease of attachment and detachment is important.

The present invention eliminates the need for positioning around the power shaft when installing rotating bodies such as fans and filters on the power shaft, suppresses abnormal sounds and The objective is to provide a new power transmission structure that can quickly stop or slow down.

One aspect of the present invention includes a power transmission mechanism and a rotating body, wherein the power transmission mechanism transmits rotation of a power shaft of a drive section to the rotary body, and (a) the rotation of the power shaft is transmitted to the rotation body. A rotation prevention mechanism other than a one-way clutch that transmits transmission to a rotating body, or (b) a brake mechanism that attenuates a speed difference between the power shaft and the rotating body, and the rotating body is provided with an attachment/detachment device and can be freely attached and detached. is attached to the power shaft, and includes a one-way clutch that transmits the rotation of the power shaft to the rotating body, and when the output of the drive unit is switched to a low speed side including stopping, at least: The problem was solved by creating a device in which a rotating body and a power transmission mechanism are connected, in which the above (a) or (b) acts.
Since the one-way clutch 50 is provided on the rotating body 4, the rotating body 4 can be mounted on the power shaft 20 without having to position it in the circumferential direction of the power shaft 20. Furthermore, when the output of the drive section 9 is switched to a low speed side including stopping, the rotation speed can be changed to match the output of the drive section 9 to which the operator has switched without any time.

In addition to the above-mentioned aspects, one aspect of the present invention is that the rotation prevention mechanism is configured to connect a rotating body and power transmission, wherein a protrusion provided on the power shaft is brought into pressure contact with an elastic material provided on the rotating body. We attempted to solve this problem by creating a device with connected mechanisms .
This aspect provides a novel and simple detent mechanism in which the protrusion is brought into pressure contact with the elastic member 60.

In addition to the above-mentioned aspects, one aspect of the present invention is that the brake mechanism is a mechanism in which a friction material is disposed inside a boss portion of the rotating body and comes into contact with the surface of the power shaft, and/or The problem has been solved by providing a device in which a friction material is disposed at the hub portion, and a rotating body is connected to a power transmission mechanism, which is a mechanism that contacts the inner circumferential surface of the boss portion.
This aspect provides a novel friction brake mechanism that brakes the rotation of the power shaft 20.

In addition to the above aspects, one aspect of the present invention is to provide a device in which a rotating body and a power transmission mechanism are connected to each other so as to allow the entire one-way clutch to shift in an appropriate direction. We tried to solve the problem.
By shifting the one-way clutch 50 in an appropriate direction, the power shaft 20 can be inserted even if the power shaft 20 is inserted from a direction slightly deviated from the center of the one-way clutch 50.

In addition to the above aspects, one aspect of the present invention aims to solve the problem by providing a device in which the rotating body is a fan and/or a filter, and a power transmission mechanism is connected to the rotating body .
Fans and filters are rotating bodies that are required to be easily attached and detached for purposes such as cleaning, and are particularly effective in the present invention.

One aspect of the present invention includes an aspect of a device in which a drive unit and a power shaft of the drive unit are connected to the device in which the rotating body and the power transmission mechanism of the above aspect are connected.
Furthermore, the problem was solved by creating a range hood equipped with this device .
The present invention is particularly effective for range hoods, which require periodic cleaning of rotating members such as fans and grease filters due to dirt such as oil.

Because the rotating body is equipped with a one-way clutch, it is now possible to attach the rotating body to the power shaft without having to position it in the circumferential direction of the power shaft.
Furthermore, since it is no longer necessary to engage the drive pin with the engagement groove provided in the boss portion of the rotating body, abnormal sounds and noises can be prevented.
Further, when the output of the drive section is switched to a low speed side including stopping, the rotation speed can be set to match the output of the drive section to which the operator has switched without requiring time.

(A) Front view (B) Top view (C) Bottom view (D) Right side view (E) Perspective view viewed from the lower right (F) Viewed from the upper right of the range hood of the first embodiment of the present invention Perspective view A perspective view of the range hood according to the first embodiment of the present invention, seen from the lower right, with the rectifier plate removed. Cross-sectional view taken along II cross section in Figure 1(A) A perspective view showing the state immediately before the fan is attached to the motor power shaft Exploded view showing assembly of fan boss, one-way clutch, and elastic material Enlarged view of main parts showing the attachment relationship between the one-way clutch and the one-way clutch fixing plate Side view showing the arrangement of the motor, power shaft, shaft pin, and elastic material A perspective view showing how the shaft pin is pressed against an elastic material. Cross-sectional view from the side of a fan equipped with a rotation stopper (shaft pin and elastic material) Cross-sectional view of the main part of the structure around the power shaft equipped with a friction brake (O-ring)

<Example 1>
(Overview of range hood of Example 1)
The range hood 1 according to the present invention will be explained. 1 is a plan view, a front view, a bottom view, a right side view, a perspective view seen from the upper right, and a perspective view seen from the lower right of the range hood 1 in this embodiment, and FIG. 2 is a range hood 1 in this embodiment FIG. 3 is a perspective view seen from the lower right when the rectifying plate 7 of No. 1 is removed, and FIG. 3 is a sectional view in the front-rear direction from the front side to the back side when the range hood is installed.

The range hood 1 of the present invention has a thin hood 2 having an upwardly concave inner panel 5 on the inner surface for collecting steam, oil smoke, etc. generated by cooking performed below or around the hood. The hood 2 is connected to a blower box 3 connected to an exhaust duct (not shown) near a communication port 6 located at the rear of the top. The blower box 3 has a fan 4 therein which is a sirocco fan and generates air flow. Therefore, when the fan 4 operates, the communication port 6 becomes a negative pressure, and the air below the inner panel 5 is sucked in through the communication port 6 and exhausted to the outside through the exhaust duct.

The communication port 6 is provided with a disk-shaped grease filter 8 having a hole through which air flows, and a motor 81 that rotates the grease filter 8, with a power shaft 20 connected to the center of the disk of the grease filter 8 by an attachment/detachment device 10. will be provided.

The air below the inner panel 5 contains oil smoke etc. generated by cooking, and when the fan 4 operates, it is present at the communication port 6, that is, on the flow path of the air generated by the fan 4, and the fan The grease filter 8 is attracted to the hole in the grease filter 8 located upstream of the grease filter 4, and passes through the hole. The grease filter 8 is rotatably provided by a grease filter motor 81, and when the range hood 1 is operated (normal operation), the fan 4 generates an air flow and the grease filter motor 81 rotates the grease filter 8. Rotate. When the grease filter 8 rotates, air passes through the holes, while oil impinges on the surface of the grease filter 8. The range hood 1 collects oil contained in the air by rotating the grease filter 8.

The attachment/detachment device 10 that connects the grease filter 8 and the power shaft 20 is located directly above the rectifying plate 7, so when an operator removes the grease filter 8 from the power shaft 20 for cleaning etc., first remove the rectifying plate 7. is removed to expose the grease filter 8 as shown in FIG. 2, and then the attachment/detachment device 10 is operated.
The structure of the range hood 1 of the present invention is merely an example, and is not limited to this.

Embodiment 1 includes (a) a rotation prevention mechanism that transmits the rotation of the power shaft 20 other than the one-way clutch 50 to the rotating body 4, and when the output of the drive unit 9 is switched to the low speed side including stopping, the rotation of the power shaft 20 other than the one-way clutch 50 is This is an example in which the anti-rotation mechanism shown in (a) works.

(Outline of power transmission mechanism)
FIG. 4 shows the state immediately before the fan 4 is attached to the power shaft 20. A fan motor 9 drives the fan 4 via a power shaft 20. The attachment/detachment device 10 is attached to the fan 4 so as to be integral with the fan 4, and when attaching the fan 4 to the power shaft 20, the fan 4 is attached to the power shaft 20 by inserting the distal end portion 21 of the power shaft into the attachment/detachment device 10. It will be installed.
By attaching the fan 4 to the power shaft 20 using the attachment/detachment device 10, the driving force of the fan motor 9 is transmitted to the fan 4.

FIG. 5 is an exploded view showing the assembly of the fan boss 40, one-way clutch 50, and elastic member 60. The fan boss 40 is provided on the fan 4 (not shown), and the two are integrated. The fan boss 40 is provided with a one-way clutch fixing plate 51 provided with a donut-shaped hole (one-way clutch mounting hole 513). Keys 512 are provided on three sides of the one-way clutch mounting hole 513 of the one-way clutch fixing plate 51, and are fitted into key grooves 502 provided in the one-way clutch 50 and fixed.
Next, the one-way clutch cover 52 is placed over the one-way clutch 50. Cover attachment holes 521 provided at three locations around the one-way clutch cover 52 are aligned with the fixed plate attachment hole 511 and the fan boss attachment hole 41, and are fixed to the fan boss 40 with attachment screws 53.

An elastic material 60 is fitted into the bulge 524 of the one-way clutch cover 52. A power shaft insertion hole 65 is provided in the center of the elastic member 60, through which the power shaft 20 can be inserted.

(Installation relationship between one-way clutch and one-way clutch fixing plate)
FIG. 6 is an enlarged view of main parts showing the attachment relationship between the one-way clutch 50 and the one-way clutch fixing plate 51.
As described above, the one-way clutch mounting hole 513 on the inner circumferential surface of the one-way clutch fixing plate 51 is provided with keys 512 on three sides that fit into the key grooves 502 of the one-way clutch 50.
Further, the depth a of the keyway 502 of the one-way clutch 50 is configured to be slightly larger than the height d of the key 512 of the one-way clutch fixing plate 51, and the depth a of the keyway 502 of the one-way clutch 50 is slightly larger than the height d of the key 512 of the one-way clutch fixing plate 51. The one-way clutch 50 is provided with play to move toward or away from the power shaft 20.
Further, the width c of the keyway 502 of the one-way clutch 50 is configured to be slightly wider than the width b of the key 512 of the one-way clutch fixing plate 51, and the one-way clutch 50 is configured to fit inside the one-way clutch mounting hole 513. , c-b in the circumferential direction of the power shaft.
Therefore, the one-way clutch 50 can move slightly in an appropriate direction.
In order to insert the power shaft 20 into the one-way clutch 50 provided on the fan 4, it must be inserted accurately into the center of the one-way clutch 50, but due to the play mentioned above, it can be inserted even if it is slightly off-center.
Then, when the fan motor 9 starts, the keyway 502 of the one-way clutch 50 and the key 512 of the one-way clutch fixing plate 51 are engaged, and drive connection is established even if there is play.
Note that play may be provided in the direction of the power axis.
The one-way clutch 50 allows the one-way clutch 50 to shift in an appropriate direction, and the power shaft 20 can be inserted therein without strictly centering the one-way clutch 50. Also, due to the characteristics of the one-way clutch 50, the power shaft 20 It is a member that can be inserted from any direction in the circumferential direction, and the fan 4 can be easily attached to the power shaft 20.

(prevents rotation)
FIG. 7 is a side view showing the arrangement of the fan motor 9, power shaft 20, shaft pin 25 as a protrusion, and elastic member 60. The attachment/detachment device 10 is fixed to the fan boss 40 and is integrated with the fan 4 (not shown). The fan boss 40 is provided with the elastic material 60 described above. A power shaft 20 extends from the motor 9 of the fan 4 (only a portion of which is shown). By inserting the power shaft 20 into the power shaft insertion hole 65 of the elastic member 60 described above, the power shaft 20 is fitted into the attachment/detachment device 10 through the one-way clutch 50.
A shaft pin (protrusion) 25 that is a protrusion protrudes from the power shaft 20, and when strongly pressed by the elastic member 60, the shaft pin (protrusion) 25 deforms the elastic member 60 and sinks into it. As can be seen from Figure 7.
8 is a perspective view of FIG. 7 viewed from a different angle, and FIG. 9 is a sectional view of the fan 4 from a side. A shaft pin (projection) 25 provided on the power shaft 20 is pressed and bit into the elastic member 60. As described above, the one-way clutch 50 is provided within the one-way clutch cover 52 provided on the fan boss 40.
The power shaft 20 is drivingly connected to the fan 4 through a connection between a shaft pin (projection) 25 and an elastic member 60, and is also drivingly connected to the fan 4 through a one-way clutch 50.

(Effect of Example 1)
As shown in FIG. 4, which shows the state immediately before the fan 4 is attached to the power shaft 20, the fan 4 is attached to the power shaft 20 by inserting the distal end portion 21 of the power shaft into the attachment/detachment device 10. . When the power shaft 20 is inserted into the attachment/detachment device 10, the tip portion 21 of the power shaft passes through the elastic member 60, the one-way clutch 50, and the fan boss 40 in this order, as shown in FIG.
The shaft pin (protrusion) 25 of the power shaft 20 abuts the elastic member 60 and is strongly pressed, and the shaft pin (protrusion) 25 deforms the elastic member 60 and bites into it. The power shaft 20 and the attachment/detachment device 10 are engaged by a locking mechanism (not shown), and the installation of the fan 4 is completed.
The one-way clutch 50 engages with the power shaft 20 in the direction of transmitting the driving force of the fan motor 9, but when the output of the fan motor 9 is switched to a low speed side including stopping, the one-way clutch 50 engages with the power shaft 20. The drive connection with shaft 20 is broken.

(1) When the motor is started or the output is switched to the high speed side When the fan motor 9 is started, in addition to the drive connection by the one-way clutch 50, the elastic member 60 and the shaft pin (protruding part) provided on the power shaft 20 ) 25, two types of drive connection mechanisms coexist.
When the one-way clutch 50 is not provided and only the drive coupling mechanism is provided using the elastic member 60 and the shaft pin (protrusion) 25 provided on the power shaft 20, when the drive start operation of the fan motor 9 is performed, A large torque is applied to the power shaft 20. This large torque tends to deform the elastic member 60 so as to twist the shaft pin (protrusion) 25, which is a protrusion protruding from the power shaft 20.
On the other hand, when the two types of drive coupling mechanisms described above coexist, the drive coupling of the one-way clutch 50 is instantaneously and firmly established, and the more the elastic member 60 is deformed, the more the shaft pin (projection) 25 Before the motor moves, the one-way clutch 50 connects the drive. Therefore, all of the driving force of the fan motor 9 is transmitted to the fan 4 by the one-way clutch 50. Almost no torque is applied to the contact portion between the elastic member 60 and the shaft pin (protrusion) 25, and deterioration of the elastic member 60 due to repeated deformation is prevented.
Even if the elastic member 60 were to be deformed at the contact point with the shaft pin (projection) 25 when the fan motor 9 was operated to start driving, the elastic member 60 would be deformed due to the driving connection by the one-way clutch 50. No more torque is applied, the deformation is eliminated, and deterioration of the elastic material 60 is prevented.

Even when the output of the fan motor 9 is switched to the high speed side, that is, when switched from low speed to high speed, no large torque is applied to the elastic member 60, as described above.

(2) When the output of the motor is switched to the low speed side that includes stopping When the worker switches the output of the fan motor 9 to the low speed side that includes stopping, the worker suddenly pedals the bicycle that was being pedaled at high speed slowly. As the one-way clutch 50 is rotated, the drive connection of the one-way clutch 50 is cut off, and a force is applied in the opposite direction to the rotating direction. By being received by the drive connection, the drive connection acts as a rotation stopper, and the rotational speed of the power shaft 20 is reduced to match the output of the fan motor 9.
During the switching operation to the low speed side, including stopping, a large torque is not applied as when starting the fan motor 9, and air resistance of the fan 4 is also applied, so the elastic member 60 is not significantly deformed by the operation. Therefore, deterioration of the elastic material 60 is prevented.

If only the one-way clutch 50 was used, it would take time for the rotation speed of the fan 4 to reach the rotational speed of the fan 4 as operated by switching to the low speed side including stopping, but the reactivity accompanying the switching increases. In addition, if only the one-way clutch 50 is used, it takes time for the rotation speed of the fan 4 to drop, and the operator may mistake the operation for switching to the low speed side as unsuccessful and repeat the operation many times. It could happen. On the other hand, in this embodiment, the rotation speed of the fan 4 matches the output of the fan motor 9 earlier than when driving and connecting with only the one-way clutch 50, so that the fan 4, which was rotating at high speed, The rotation sound decreases to the rotation sound of the matched output, and the operator is informed that the operator has switched the output of the fan motor 9.

<Modification of Example 1>
In the first embodiment, the shaft pin (protrusion) 25 is a protrusion that protrudes from the power shaft 20, but instead of the shaft pin (protrusion) 25, an E-ring may be provided on the power shaft 20.
Further, in the first embodiment, the rotating body is the fan 4, but the rotating body may be the grease filter 8.

<Example 2>
Embodiment 2 is equipped with (b) a brake mechanism that attenuates the speed difference between the power shaft 20 and the rotating body 4, and when the output of the drive unit 9 is switched to the low speed side including stopping, the brake mechanism of (b) is provided. This is an example in which this works.
The one-way clutch 50 connects the drive force from the fan motor 9 only in the direction (positive direction) in which the drive force from the fan motor 9 is transmitted to the fan 4 via the power shaft 20. Therefore, when the output of the fan motor 9 is switched to a low speed side including stopping, the fan 4, especially the sirocco fan, is heavy and has a large rotating moment, so it takes time to stop.
Therefore, as shown in FIG. 10, an O-ring mounting groove 26 was provided inside the fan boss 40, and a friction material made of an O-ring 70 was fitted into the fan boss 40 and brought into contact with the surface of the power shaft to apply the brake.
While the fan 4 and the power shaft 20 are drivingly connected by the one-way clutch 50, the fan 4 and the power shaft 20 rotate at the same rotation speed, and no friction occurs between them. However, when the output of the fan motor 9 is switched to a low speed side including stopping, the drive connection by the one-way clutch is broken. While the rotational speed of the fan 4 does not drop for a while, the rotational speed of the power shaft 20 drops immediately, resulting in a difference in rotational speed between the two.
Therefore, the surface of the power shaft comes into contact with the O-ring 70, which is a friction material provided inside the fan boss 40, and functions as a friction brake to reduce the rotational speed difference between the two. Alternatively, the surface of the power shaft and the O-ring 70 are driven and connected by friction, and function so that no difference in rotation occurs.
Then, when the rotation speed of the power shaft 20 reaches a speed corresponding to the output of the fan motor 9, the friction generated between the two disappears. For example, when a worker operates the output of the fan motor 9 from high speed to low speed, the rotation speed of the fan 4 (fan boss 40) and rotating shaft 20 reaches the low rotation speed as per the operation. coincide with each other, and the friction between the O-ring 70 provided on the inner circumferential surface of the fan boss 40 and the power shaft 20 is also eliminated.
As described above, when the output of the fan motor 9 is switched to a low speed side including stopping, the rotation speed of the fan 4 can be made to match the output of the motor 9 without requiring time.
Further, since the brake is activated only when the output of the drive unit is switched to a low speed side including stopping, a large torque is not applied to the brake, and deterioration of the brake is suppressed.

<Modification 1 of Example 2>
A friction material may be provided on the power shaft 20 side so as to come into contact with the inner circumferential surface of the fan boss 40.
Although the O-ring 70 is shown in Example 2 as an example of the friction material, it goes without saying that any material and shape may be used as long as it produces friction.

<Modification 2 of Example 2>
In the second embodiment, the brake is a friction brake, but a non-contact type brake such as an electromagnetic brake using eddy current may be used. A disk is provided on the power shaft 20, and this disk is sandwiched between magnets such as electromagnets provided on the fan boss 40. When a difference in rotational speed occurs between the fan 4 and the power shaft 20, an eddy current is generated and rotational resistance (braking force) is generated.

As described above, by providing a one-way clutch on the rotating body, the rotating body can be attached to the power shaft without positioning, and when the output of the drive unit is switched to the low speed side including stopping, it is possible to attach the rotating body to the power shaft without positioning. A completely new power transmission mechanism is provided that allows the rotation speed to match the output of the drive unit switched by the operator.

1 Range hood 2 Hood 3 Blower box 4 Fan (rotating body)
5 Inner panel 6 Communication port 7 Rectifier plate 8 Grease filter 81 Grease filter motor (drive part)
9 Fan motor (drive part)
10 Attachment/detaching device 20 Power shaft 21 Tip portion 25 of power shaft Shaft pin (projection)
26 O-ring mounting groove 40 Fan boss (boss part)
41 Fan boss mounting hole 50 One-way clutch 502 Keyway 51 One-way clutch fixing plate 511 Fixing plate mounting hole 512 Key 513 Clutch mounting hole 52 One-way clutch cover 521 Cover mounting hole 524 Swelling part 53 Mounting screw 60 Elastic material 65 Power Shaft insertion hole 70 O-ring (friction material/brake mechanism)

Claims (7)

Equipped with a power transmission mechanism and a rotating body,
The power transmission mechanism transmits the rotation of the power shaft of the drive unit to the rotating body,
(a) A detent mechanism other than a one-way clutch that transmits the rotation of the power shaft to the rotating body, or
(b) comprising a brake mechanism that attenuates the speed difference between the power shaft and the rotating body;
The rotating body is provided with an attachment/detachment device and is detachably attached to the power shaft,
comprising a one-way clutch that transmits rotation of the power shaft to the rotating body,
A device in which a rotating body and a power transmission mechanism are connected, in which at least (a) or (b) acts when the output of the drive unit is switched to a low speed side including stopping.
2. The apparatus for connecting a rotating body and a power transmission mechanism according to claim 1, wherein the rotation prevention mechanism is a projection provided on the power shaft that is pressed against an elastic member provided on the rotating body.
The brake mechanism may be a mechanism in which a friction material is disposed inside a boss portion of the rotating body and comes into contact with the surface of the power shaft, and/or a friction material is disposed on the power shaft and a friction material is disposed inside the boss portion. An apparatus in which the rotating body and power transmission mechanism according to claim 1 or 2 are connected, the mechanism being in contact with the peripheral surface.
4. A device connecting a rotating body and a power transmission mechanism according to claim 1 , wherein the entire one-way clutch is provided to allow displacement in an appropriate direction.
The device according to any one of claims 1 to 4, wherein the rotating body is a fan and/or a filter.
Further, a device in which a drive unit and a power shaft of the drive unit are connected to a device in which the rotating body and the power transmission mechanism according to any one of claims 1 to 5 are connected.
A range hood comprising the device according to claim 6.

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