WO2020166497A1

WO2020166497A1 - Reverse input blocking device using coil spring

Info

Publication number: WO2020166497A1
Application number: PCT/JP2020/004736
Authority: WO
Inventors: 輝信飯田
Original assignee: 株式会社オリジン
Priority date: 2019-02-15
Filing date: 2020-02-07
Publication date: 2020-08-20
Also published as: JP6736710B1; CN113508243A; JP2020133713A; CN113508243B

Abstract

Provided is a reverse input blocking clutch which, although lightweight and compact, is able to transmit rotational torque from an input shaft to an output shaft efficiently, and reliably blocks rotation from the output shaft to the input shaft. Resistance torque is applied to a retainer (12) by a resistance torque application means (16), and after transmission of rotation from an input shaft (4) to an output shaft (6) in a forward direction is completed, the input shaft (4) is made to rotate in the reverse direction by a required amount.

Description

Reverse input breaker using coil spring

The present invention utilizes a clutch device for disconnecting/contacting power transmission between an input shaft and an output shaft, particularly a coil spring to transmit only rotation in a positive direction from the input shaft to the output shaft, The rotation from the input shaft to the input shaft in both the forward and reverse directions relates to a reverse input cutoff device that idles and cuts off the output shaft.

Patent Document 1 below discloses an example of a reverse input blocking device that uses a coil spring. The reverse input interruption device disclosed in the cited document 1 includes an input shaft and an output shaft rotatable about a common rotation shaft. A rod having a circular cross section is integrally connected to the output shaft coaxially therewith, and the rod penetrates the center of the input shaft. A coil spring is inserted through the rod, and the coil spring is arranged between the rod and the input shaft. Hook portions are formed at both axial ends of the coil spring, one of the hook portions is engaged with the input shaft, and the other of the hook portions is engaged with an annular retainer rotatable about a common rotation shaft.

In the above-mentioned reverse input cutoff clutch, when the input shaft rotates in the forward direction, the coil spring engaging with the input shaft acts in the tightening direction, and the coil spring is reduced in diameter and is integrally connected to the output shaft. The retainer comes into close contact with the outer peripheral surface of, and the retainer integrally rotates with the input shaft and the output shaft in the forward direction.

　The rotation of the input shaft in the positive direction stops, and the transmission of rotation in the positive direction from the input shaft to the output shaft ends. Immediately after the rotation of the input shaft in the positive direction stops, even if the rotation of the input shaft in the positive direction stops, the retainer rotates somewhat in the positive direction due to inertia, and the retainer of the other side of the stopped coil spring Abut the hook and push it in the direction that the coil spring loosens. As a result, the tightening of the coil spring on the rod integrally connected to the output shaft is released. This allows the rod to rotate relative to the coil spring, and rotation of the output shaft from the input shaft to both the forward and reverse directions is blocked by idling of the output shaft.

Such a reverse input blocking device can be applied to a mechanical component of a so-called smoke exhaust damper as disclosed in Patent Document 2, for example. The smoke exhaust damper is a device that is installed inside a building such as a building and that discharges smoke generated inside the building to the outside of the building when a fire occurs inside the building. The smoke exhaust damper has a blade that communicates with the outside of the building and that can close the smoke outlet, and the blade rotates between a closed position that closes the smoke outlet and an open position that opens the smoke outlet. It is free. The blades are constantly urged by the torsion spring in the direction that the smoke exhaust port is opened, and the rotation in the opening direction from the closed position to the open position is caused by the free fall of the torsion spring to close the open position to the closed position. Rotation in each direction is performed by a motor. In such a case, if a reverse input cutoff device, which is a kind of clutch, is used, it becomes possible to automatically control the power transmission by a simple device. Without doing so, it becomes possible to appropriately connect and disconnect the power transmission mode between the motor and the blade.

JP 2012-122585 A Japanese Patent Laid-Open No. 2001-116331

However, in the above-described reverse input cutoff device, since the retaining force (resistance) of the retainer with respect to the rotation about the central axis is only its own inertia, when the input shaft rotates in the forward direction, the coil spring is The coil spring may rotate with respect to the rod without being sufficiently reduced in diameter, and the efficiency of transmission of the rotational torque from the input shaft to the output shaft may be reduced or may not be transmitted. If the inertia of the retainer is increased to prevent such a risk, the weight and/or size of the retainer and the entire device including the retainer increases. Further, depending on the size of the inertia of the retainer, the rotation in the forward direction due to the inertia of the retainer described above is insufficient, and the tightening of the coil spring on the output shaft is not sufficiently released, and the input from the output shaft is not released. The rotation to the shaft may not be sufficiently blocked.

The present invention has been made in view of the above facts, and its main technical problem is that it is possible to efficiently transmit rotational torque from an input shaft to an output shaft, despite being lightweight and compact. It is an object of the present invention to provide a new and improved reverse input cutoff clutch in which rotation from the output shaft to the input shaft is surely cut off.

As a result of earnest studies and experiments, the present inventor has applied a resistance torque to the retainer by a resistance torque applying means, and after the rotation of the input shaft in the positive direction has been transmitted to the output shaft, the input shaft is rotated in the reverse direction. It was found that the above-mentioned main technical problems can be achieved by rotating a required amount.

That is, according to the present invention, as a reverse input cutoff device that achieves the above-mentioned main technical problem, an input shaft and an output shaft that are rotatable around a common rotation shaft are provided, and a positive input from the input shaft to the output shaft is provided. A reverse input cutoff device in which rotation in the direction is transmitted, while rotations in both the forward and reverse directions from the output shaft to the input shaft are blocked by idling the output shaft,
Coil springs are commonly mounted on the outer peripheral surfaces of the input shaft and the output shaft, and hook portions are formed at both axial ends of the coil springs, one of the hook portions being on the input shaft and the other of the hook portions. Are respectively engaged with annular retainers rotatable about the common rotation axis,
Resistance torque is applied to the retainer by resistance torque applying means,
When the input shaft rotates in the positive direction, the coil spring contracts in diameter and comes into close contact with the input shaft and the output shaft in common, and the retainer is integrated with the input shaft and the output shaft in the positive direction. Rotate,
When the transmission of the rotation in the positive direction from the input shaft to the output shaft is completed, the input shaft is rotated in the opposite direction by a required amount, and the close contact of the coil spring with the output shaft is released. A reverse input interruption device is provided.

Preferably, a cylindrical limiting member is arranged on the outer circumference of the coil spring. In this case, a notch that aligns with the other of the hook portions is formed at the other axial end of the limiting member, and the other axial end of the limiting member is fitted inside the retainer. Is good. Preferably, the resistance torque applying means is a wave spring, and the wave spring is housed together with the retainer in a fixed retainer housing member.

In the reverse input cutoff device of the present invention, the resistance torque is applied to the retainer by the resistance torque application means, and therefore, when the input shaft rotates in the positive direction, the coil spring contracts to reduce the diameter of the output shaft. It is possible to prevent the coil spring from rotating with respect to the output shaft prior to the close contact. That is, in the reverse input cutoff device of the present invention, when the input shaft rotates in the positive direction, the coil spring surely contracts in diameter and comes into close contact with the input shaft and the output shaft in common, and the output shaft receives the input power. Since it rotates in the forward direction integrally with the shaft, the rotation in the forward direction from the input shaft to the output shaft is efficiently transmitted without increasing the weight and/or size of the retainer and the entire device including the retainer. It becomes possible.

When the transmission of rotation in the positive direction from the input shaft to the output shaft is completed, the input shaft is rotated in the reverse direction by the required amount. As a result, the coil spring that has been reduced in diameter is expanded in diameter and the close contact of the coil spring with the output shaft is reliably released, and rotation in both the forward and reverse directions from the output shaft is blocked by idling the output shaft. become.

It is a figure which shows the structure of suitable embodiment of the reverse input interruption|blocking apparatus of this invention. It is an exploded perspective view of the reverse input interruption|blocking apparatus shown in FIG. It is a figure which shows the input shaft of the reverse input interruption|blocking apparatus shown in FIG. 1 alone. It is a figure which shows the output shaft of the reverse input interruption|blocking apparatus shown in FIG. 1 alone. It is a figure which shows the limiting member of the reverse input interruption|blocking apparatus shown in FIG. 1 alone. It is a figure which shows the retainer of the reverse input interruption|blocking apparatus shown in FIG. 1 alone. It is a figure which shows the retainer accommodation member of the reverse input interruption|blocking apparatus shown in FIG. 1 alone. It is a figure which shows operation|movement when the input shaft of the reverse input interruption|blocking apparatus shown in FIG. 1 is rotated to a positive direction.

Hereinafter, a more detailed description will be given with reference to the accompanying drawings illustrating a preferred embodiment of a reverse input blocking device configured according to the present invention.

Referring to FIG. 1 and FIG. 2, a reverse input interrupting device, generally designated by reference numeral 2, constructed according to the present invention includes an input shaft 4, an output shaft 6, a coil spring 8, a limiting member 10, a retainer 12, The retainer housing member 14 and the resistance torque applying means 16 are provided. In FIG. 1 (and FIG. 8), the coil spring 8 and the retainer 12 are shown with hatching for easy understanding.

As shown in FIG. 3, the input shaft 4 includes a connecting portion 18 which is a plate-like member having a predetermined thickness, and an acting portion 20 which projects in the axial direction at the center of one end face in the axial direction of the connecting portion 18. A through hole 22 having a circular cross section is formed in the center of the input shaft 4 and linearly penetrates in the axial direction. The outer peripheral shape of the connecting portion 18 is a shape in which a pair of diametrically opposed portions on the circumference (such portions are indicated by reference numeral 24) are deformed in parallel and linearly. The action portion 20 has a cylindrical shape surrounding the through hole 22, and an engaging groove 26 having a U-shaped cross section that linearly extends in the axial direction is formed at a predetermined portion of the outer peripheral surface thereof. The engagement groove 26 is formed in the center of the pair of portions 24 formed in the connecting portion 18, as seen in the circumferential direction, as can be understood by referring to the left diagram of FIG. 3. The input shaft 4 is rotationally driven by connecting a drive source such as a motor (not shown) to the outer circumference of the connecting portion 18.

Referring to FIG. 1 together with FIG. 4, the output shaft 6 has a generally cylindrical shape, and its outer diameter is substantially the same as the outer diameter of the action portion 20 of the input shaft 4 (see FIG. 1). I want to be). A pair of connecting grooves 28 are formed on the inner peripheral surface of the output shaft 6 so as to face each other and extend linearly in the axial direction. A rotation shaft of a driven member (not shown) is inserted inside the output shaft 6, and the rotation shaft engages with the pair of connection grooves 28, whereby the output shaft 6 can rotate integrally with the driven member.

Describing with reference to FIGS. 1 and 2, the coil spring 8 is formed by winding a wire rod, and

hook portions

30a and 30b are formed on both axial ends thereof, respectively. One of the hook portions 30a extends inward in the radial direction, and the other 30b extends outward in the radial direction. Each hook portion extends linearly in a normal direction to a circle formed by winding the wire rod. The inner diameter of the coil spring 8 is constant in the axial direction except for the

hook portions

30a and 30b. The diameter of the coil spring 8 will be described later.

Describing with reference to FIG. 1 together with FIG. 5, the limiting member 10 has a cylindrical shape, and the inner diameter of the limiting member 10 is larger than the outer diameters of the action portion 20 of the input shaft 4 and the output shaft 6. A notch 32 having a U-shaped cross section is formed at the axial end of the limiting member 10.

Describing with reference to FIG. 1 together with FIG. 6, the retainer 12 is an annular plate-shaped member, and its inner diameter is slightly larger than the outer diameter of the limiting member 10. An engagement groove 34 having a U-shaped cross section is formed on the inner peripheral surface of the retainer 12. The retainer 12 is housed in the fixed retainer housing member 14 shown in FIG.

Describing with reference to FIG. 1 together with FIG. 7, the retainer housing member 14 is composed of a cup-shaped main body 36 and a shield body 38 that is combined with the main body 36 and closes the inside thereof. The main body 36 includes an annular end plate 40 and a cylindrical side wall 42 that extends from the outer peripheral edge of the end plate 40 in the axial direction. A circular recess 44 is formed in the center of the inner surface of the end plate 40, and an inner annular protrusion 46 and an outer annular protrusion 48 are concentrically formed on the outer side of the circular recess 44, respectively. An annular groove 50 is formed on the inner surface of the extended end of the side wall 42. The shield body 38 is an annular plate member, and has a circular recess 51 formed at the center of one side surface and an annular projection 52 protruding outward in the radial direction. The shield body 38 axially faces the end plate 40 of the main body 36 with the circular concave portion 51 axially facing the end plate 40 of the main body 36 and the outer peripheral edge of the shield body 38 aligned with the open end of the side wall 42 of the main body 36. By being forced in the direction, the annular protrusion 52 is fitted into the annular groove 50 and is coupled to the main body 36.

Referring to FIGS. 1 and 2, in the illustrated embodiment, the resistance torque imparting means 16 is an annular wave spring, which is disposed inside the retainer housing member 14 and resists the retainer 12. Apply torque. The resistance torque applying means is not limited to the wave spring, and may have any property as long as resistance torque is applied to the retainer 12. For example, the resistance torque applying means is disposed on the outer peripheral surface of the retainer 12 and is provided in the retainer housing member 14. It may be a leaf spring that applies resistance torque by friction between the retainer and the retainer. Alternatively, the retainer may be made of metal so that the retainer torque is applied by magnetic force.

Next, with reference to FIGS. 1 and 2, a state in which the above-described components are combined will be described.
The input shaft 4 and the output shaft 6 are coaxially juxtaposed so that the acting portion 20 is adjacent to the output shaft 6 in the axial direction, and are arranged in a mutually rotatable state about a common rotation axis o. The coil spring 8 is commonly mounted on the outer peripheral surface of the action portion 20 of the input shaft 4 and the outer peripheral surface of the output shaft 6, and the limiting member 10 is arranged on the outer periphery of the coil spring 8. Here, the outer diameter of the coil spring 8 in the free state is equal to or slightly smaller than the inner diameter of the restricting member 10, and the coil spring 8 is inside the restricting member 10 in the free state or in a slightly reduced diameter. Is located in. When the coil spring 8 is arranged inside the limiting member 10, the inner diameter of the coil spring 8 is larger than the outer diameter of the output shaft 6, and the output shaft 6 rotates relative to the coil spring 8. It will be possible. One of the hook portions 30a of the coil spring 8 is engaged with the engagement groove 26 of the input shaft 4, and the other 30b is engaged with the engagement groove 34 of the retainer 12. At this time, the axial end portion of the limiting member 10 is loosely fitted inside the retainer 12 having an annular shape, with the other hook portion 30b aligned with the notch 32. The retainer 12 is housed inside the retainer housing member 14 together with the resistance torque applying means 16 (wave spring in the illustrated embodiment). The retainer 12 is axially pressed by the resistance torque imparting means 16, and the retainer 12 is imparted with a resistance torque due to friction between the retainer 12 and the fixed retainer housing member 14. Inside the retainer housing member 14, the axial end of the output shaft 6 is aligned with the inside of the circular recess 44 formed in the main body 36, and the resistance torque applying means 16 is aligned with the circular recess 51 formed in the shield body 38. R.

Next, the operation of the reverse input blocking device shown in FIG. 1 will be described with reference to FIG.
As shown by the arrows in FIG. 8, when the input shaft 4 is rotated in the forward direction (clockwise as viewed from the right in the AA sectional view in the illustrated embodiment) by the motor of the drive source, the same figure is used. As shown in the BB end view, the action portion 20 rotates in the forward direction, and the hook portion 30a engaged in the engagement groove 26 is pushed in the direction in which the coil spring 8 contracts. At this time, in the reverse input cutoff device of the present invention, since the resistance torque is applied to the retainer 12 by the resistance torque applying means 16, when the input shaft 4 rotates in the forward direction, the coil spring 8 is It is possible to prevent the coil spring 8 from rotating with respect to the output shaft 6 before the coil spring 8 is contracted to be in close contact with the output shaft 6. That is, in the reverse input cutoff device of the present invention, when the input shaft 4 rotates in the positive direction, the coil spring 8 surely contracts in diameter and comes into close contact with both the input shaft 4 and the output shaft 6 in common. Since the output shaft 6 rotates in the positive direction together with the input shaft 4, the forward direction from the input shaft 4 to the output shaft 6 is increased without increasing the weight and/or size of the retainer 12 and the entire device including the retainer 12. Rotation can be efficiently transmitted. At this time, the input shaft 4, the output member 6, the coil spring 8, the limiting member 10, and the retainer 12 integrally rotate in the positive direction against the resistance torque by the resistance torque applying means 16.

Then, when the transmission of the rotation in the positive direction from the input shaft 4 to the output shaft 6 is completed, the input shaft 4 moves in the reverse direction (in the illustrated embodiment, when viewed from the right side of the AA sectional view, the counterclockwise direction). ) Is rotated the required amount. As a result, the diameter of the coil spring 8 which has been reduced in diameter is expanded, the close contact of the coil spring 8 with the output shaft 6 is reliably released, and the output shaft 6 becomes rotatable relative to the coil spring 8 again (FIG. 1). Return to the state shown in). That is, the rotation of the output shaft 6 in both the forward and reverse directions is blocked by the output shaft 6 idling. In the illustrated embodiment, since the tubular limiting member 10 is arranged on the outer periphery of the coil spring 8, the outer diameter of the coil spring 8 is the inner periphery of the limiting member 10 in order to increase the diameter of the coil spring 8. The contact of the coil spring 8 with the surface is limited, and the coil spring 8 is reliably prevented from being held in an excessively expanded state. If the coil spring 8 is held in a state where the diameter thereof is excessively expanded, so-called creep occurs in the coil spring 8 and there is a possibility that the coil spring 8 is damaged when the diameter is reduced or expanded again. Further, even if the input shaft 4 is excessively rotated in the opposite direction, the outer peripheral surface of the coil spring 8 comes into close contact with the inner peripheral surface of the restricting member 10, and the other hook portion 30b pushes the retainer 12 in the opposite direction to input. A state in which the coil spring 8 is excessively expanded by simply rotating the member 4, the coil spring 8, the limiting member 10, and the retainer 12 integrally in the opposite direction against the resistance torque of the resistance torque imparting means 16. Will never be held in. Therefore, it is not necessary to precisely control the motor when the input shaft 4 is rotated in the reverse direction, and the motor control system may be simple.

As described above, the reverse input blocking device of the present invention has been described in detail with reference to the attached drawings, but the reverse input blocking device of the present invention is not limited to the above-described embodiment, and various modifications can be considered. .. For example, in the above-described embodiment, the outer diameter of the working portion of the input shaft and the outer diameter of the output shaft are substantially the same, but instead of this, the outer diameter of the working portion of the input shaft is set to the outer diameter of the output shaft. The diameter may be larger than the diameter so that the coil spring is always in close contact with the acting portion of the input shaft (tightened state).

2: Reverse input cutoff device 4: Input shaft 6: Output shaft 8: Coil spring 10: Limiting member 12: Retainer 14: Retainer housing member 16: Resistance torque applying means (wave spring)
30: Hook part

Claims

An input shaft and an output shaft rotatable about a common rotation shaft are provided, and rotation in the positive direction from the input shaft to the output shaft is transmitted, while forward/reverse from the output shaft to the input shaft. Rotation in both directions is a reverse input cutoff device in which the output shaft idles and is cut off,
Coil springs are commonly mounted on the outer peripheral surfaces of the input shaft and the output shaft, and hook portions are formed at both axial ends of the coil springs, one of the hook portions being on the input shaft and the other of the hook portions. Are respectively engaged with annular retainers rotatable about the common rotation axis,
Resistance torque is applied to the retainer by resistance torque applying means,
When the input shaft rotates in the positive direction, the coil spring contracts in diameter and comes into close contact with the input shaft and the output shaft in common, and the retainer is integrated with the input shaft and the output shaft in the positive direction. Rotate,
When the transmission of the rotation in the positive direction from the input shaft to the output shaft is completed, the input shaft is rotated in the opposite direction by a required amount, and the close contact of the coil spring with the output shaft is released. Reverse input cutoff device.
The reverse input cutoff device according to claim 1, wherein a cylindrical limiting member is arranged on the outer periphery of the coil spring.
The notch that is aligned with the other end of the hook portion is formed at the other axial end of the limiting member, and the other axial end of the limiting member is fitted inside the retainer. Reverse input cutoff device described.
The reverse input cutoff device according to any one of claims 1 to 3, wherein the resistance torque applying means is a wave spring, and the wave spring is housed together with the retainer in a fixed retainer housing member.