JP2015224742A - Device for converting rotation direction to one direction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for converting rotation direction to one direction of an output shaft irrespective of normal rotation or reverse rotation of an input shaft in which the two rotary bodies are concentrically arranged to have a compact structure.SOLUTION: An inner rotary body 3 is concentrically mounted inside an outer rotary body 2 integrally rotated with an output shaft OS and each of the rotary bodies is connected to an input shaft IS through one-way clutches OC1, OC2. Internal gears are fixed to the outer rotary body 2 and the inner rotary body 3, each of the internal gear is connected by an intermediate gear supported in pivot at a gear supporting member 1 and they rotate in opposite directions from each other. When the outer rotary body 2 is rotated together with the input shaft IS in one direction, the output shaft OS rotates as it is. However, when the inner rotary body 3 is rotated together with the input shaft IS, the outer rotary body 2 is rotated in a reverse direction through the intermediate gear. Accordingly, the output shaft OS is always rotated in one direction irrespective of normal rotation or reverse rotation of the input shaft IS.

Description

  The present invention relates to a rotation direction conversion device that is interposed between a rotating input shaft and an output shaft, and that always rotates an output shaft in one direction regardless of whether the input shaft rotates forward or backward.

  In a power transmission system that rotationally drives mechanical parts or work equipment, a transmission device for changing the rotational speed, torque, and the like is conventionally used so as to match the characteristics of the driven equipment. In addition, there are often intervening devices having various functions such as a clutch that cuts off the connection with a driving source such as a motor and a torque limiter that protects against excessive torque.

  Among the transmission devices used in the power transmission system, there is a rotation direction conversion device that always rotates the output shaft in one direction regardless of whether the input shaft rotates forward or backward. A rotation direction conversion device is used in a copying machine or the like. As an example, Japanese Patent Application Laid-Open No. 2008-216968 discloses a motor capable of normal rotation and reverse rotation for driving a roller in an image forming apparatus via a rotation direction conversion device. A technique is disclosed in which a waste toner is transferred by connecting to a waste toner conveying screw and rotating the screw in one direction regardless of whether the motor is rotating forward or backward. This eliminates the need for a dedicated motor that rotates the screw in only one direction, thereby saving space or reducing costs.

  As a specific structure of the rotation direction conversion device, a plurality of one-way clutches are installed between the input shaft and the output shaft, and they are interposed in the power transmission path to the output shaft according to the forward / reverse rotation of the input shaft. There is known one that switches a one-way clutch to be operated. For example, Japanese Patent Application Laid-Open No. 2004-84783 describes a rotational direction conversion device in which three one-way clutches and a bevel gear are combined, which will be described with reference to FIG.

As shown in the overall diagram on the left side of FIG. 6, an input shaft IS and an output shaft OS are coaxially opposed to each other at the center of the fixed housing HG, and a pair of bevel gears BG1 and BG2 are provided. Opposed to each other. The bevel gears BG1 and BG2 are rotatably fitted to the output shaft OS, and are connected to each other via an idler (intermediate) bevel gear BGM that is pivotally supported by the housing HG. An enlarged cylindrical portion ISE is formed on the input shaft IS, and the tip of the output shaft OS is supported by the cylindrical portion ISE.
A first one-way clutch OC1 is placed between the tubular portion ISE and the tip of the output shaft OS, and a second one-way clutch OC2 is placed between the tubular portion ISE and the shaft portion of the bevel gear BG1. The third one-way clutch OC3 is placed between the shaft portion of the facing bevel gear BG2 and the output shaft OS. These one-way clutches are roller-type one-way clutches that push a roller RO with a spring SP in a direction to lock the roller RO with a cam surface, as shown in FIGS. is there. The first one-way clutch OC1 and the second one-way clutch OC2 are configured such that one one-way clutch is locked and the other is idled in accordance with the forward / reverse rotation of the input shaft IS (tubular portion ISE). The third one-way clutch OC3 is configured to lock when the second one-way clutch OC2 is locked (the rotational directions of the bevel gears BG1 and BG2 are opposite to each other).

  6 (a) and 6 (b), when the cylindrical portion ISE rotates counterclockwise, the roller RO of the first one-way clutch OC1 in FIG. 6 (a) forms a cylindrical portion ISE that forms an inclined cam surface. 6 and the output shaft OS, the roller RO of the second one-way clutch OC2 of FIG. 6B freely rotates so as to push back the spring SP. Therefore, the counterclockwise rotation of the input shaft IS is directly transmitted to the output shaft OS via the first one-way clutch OC1, causing the second one-way clutch OC2 to idle. When the input shaft IS rotates in the reverse direction, the first one-way clutch OC1 is idled, the second one-way clutch OC2 is locked and the bevel gear BG1 is rotated. The bevel gear BG2 is rotated in the opposite direction, and the output shaft OS is rotated counterclockwise via the third one-way clutch OC3 shown in FIG. 6 (c). That is, in the transmission device of FIG. 6, the rotation direction in which the counterclockwise rotation of the input shaft IS is transmitted to the output shaft OS as it is, and the clockwise rotation of the input shaft IS is converted into a counterclockwise rotation and transmitted. It is a conversion device.

JP 2008-216968 A Japanese Patent Application Laid-Open No. 2004-84783

  Rotating direction changing devices in one direction are often used in office equipment such as copiers, but in office equipment, many small parts are placed in a limited small volume space. It is desirable that the direction changing device is small and compact. The rotation direction conversion device of Patent Document 2 has a concentric rotation shaft center between the input shaft and the output shaft, and is easy to use when interposed in the power transmission system. However, since three bevel gears meshing with each other are used, and the idler bevel gear disposed in the housing has a radial rotation shaft, the outer diameter and axial length of the device are reduced. Is difficult.

In addition, the bevel gear is a special gear, and it is difficult to manufacture a small bevel gear having an accurate tooth shape. When the accuracy of the tooth profile is deteriorated, friction loss in power transmission increases, leading to a decrease in transmission efficiency, which also increases noise.
SUMMARY OF THE INVENTION An object of the present invention is to provide a rotational direction converter that rotates an output shaft in one direction regardless of whether the input shaft rotates forward or backward, using a normal spur gear that is easy to manufacture, and the input shaft and the output shaft are concentric. This is to constitute a compact device and solve the above-mentioned problems.

In view of the above problems, the rotational direction conversion device of the present invention has an inner rotating body concentrically installed inside an outer rotating body that rotates integrally with an output shaft, and both rotating bodies are connected via a one-way clutch. When the inner rotary body rotates together with the input shaft, the outer rotary body is driven in the reverse direction via the intermediate gear. That is, the present invention
“A rotation direction conversion device that includes an input shaft and an output shaft arranged concentrically and rotates the output shaft in one direction regardless of the rotation direction of the input shaft,
An outer rotating body that rotates integrally with the output shaft is attached to the output shaft, and an inner rotating body is installed concentrically with the outer rotating body inside the outer rotating body.
The outer rotator and the inner rotator are each connected to the input shaft via a one-way clutch, and according to the rotation direction of the input shaft, either the outer rotator or the inner rotator is It is configured to be connected to the input shaft, and
An internal gear is fixed to each of the outer rotary body and the inner rotary body, and both the internal gears rotate in opposite directions via an intermediate gear that is pivotally supported by a fixed gear support member. Are linked together. "
The rotation direction conversion device is characterized by this.

According to a second aspect of the present invention, it is preferable that both the internal gears are internal gears having the same shape and are arranged in parallel in the axial direction. Furthermore, in this case, as described in claim 3,
“The intermediate gear connecting both internal gears is a combination of two gears of the same shape, and each of the two gears meshes with each other in a part in the axial direction, and the remaining gears. In the part, one gear meshes with the internal gear of the outer rotating body, and the other gear meshes with the internal gear of the inner rotating body. "
A configuration is preferable.

  According to a fourth aspect of the present invention, it is preferable that the outer rotating body is a combination of members divided in the axial direction and the internal gear is formed on one member.

  According to a fifth aspect of the present invention, the gear support member that pivotally supports the intermediate gear is a plate-like member that includes a disk portion equal to the outer diameter of the outer rotating body and an attachment arm portion. It is preferable.

  In the rotation direction conversion device of the present invention, an inner rotating body is installed concentrically inside an outer rotating body that rotates integrally with an output shaft, and each rotating body is connected to an input shaft via a one-way clutch. Thus, only one rotating body is driven in accordance with forward / reverse rotation of the input shaft. Internal gears are fixed to both of the rotating bodies, and the internal gears are connected by an intermediate gear supported by a gear support member and rotate in opposite directions. Therefore, when the inner rotator rotates with the input shaft, the outer rotator rotates in the reverse direction via the intermediate gear, and the output shaft always rotates in one direction regardless of whether the input shaft rotates forward or backward. .

In the rotation direction conversion device of the present invention, the outer rotator and the inner rotator are installed concentrically with the input shaft and the output shaft, and the inner rotator is accommodated inside the outer rotator. Further, since the entire rotation direction changing device is mounted on a fixed part of a copying machine or the like so as to be supported by a gear support member that supports an internal gear, a housing or the like is provided outside the outer rotating body. There is no need. Therefore, the rotation direction conversion device is downsized, and in particular, the radial dimension can be reduced.
The two internal gears fixed to the concentric outer rotating body and the inner rotating body, and the intermediate gear that is gear-coupled so as to rotate the internal gears in the opposite directions are in the same direction as the input / output shaft. Rotate around the rotation axis. These gears can use spur gears with excellent dimensional accuracy even if they are small in size, so that it is possible to avoid a decrease in power transmission efficiency or an increase in noise in the rotation direction changer.

When the internal gears of the outer rotating body and the inner rotating body are made to have the same shape and arranged in parallel in the axial direction as in the invention of claim 2, the two internal gears are shared. In addition, it is possible to achieve a manufacturing cost merit by using a common intermediate gear meshing with the internal gear. By arranging the two internal gears in parallel in the axial direction, it is also possible to suppress an increase in the size of the outer rotating body that is a component having the largest diameter in the rotational direction conversion device.
The invention of claim 3 limits the structure of the intermediate gear in the invention of claim 2. Since the intermediate gear is a gear provided to rotate the internal gears of the outer rotating body and the inner rotating body in opposite directions, it is necessary to install a plurality of intermediate gears. Two gears are combined. Each of the two gears meshes with each other in a part in the axial direction, and in the remaining part, one gear meshes with the internal gear of the outer rotating body, and the other gear engages with the inner tooth of the inner rotating body. Engage with gears. Thereby, the drive mechanism which rotates the internal gears of the outer rotator and the inner rotator in the opposite directions with a simple configuration with a small occupied space is realized.

  According to the invention of claim 4, the outer rotating body has a structure in which members divided into two in the axial direction are combined, and the internal gear is formed on one of the members divided into two. In this way, after the inner rotating body is accommodated in the outer rotating body, one member forming the internal gear is combined, and the inner gear of the inner rotating body and the inner gear of the outer rotating body can be easily connected to the shaft. Can be aligned in the direction.

  According to a fifth aspect of the present invention, the gear support member that pivotally supports the intermediate gear is a plate-like member that includes a disk portion equal to the outer diameter of the outer rotating body and an attachment arm portion. The gear support member is a member that forms a fixed portion of the rotational direction conversion device of the present invention. When such a plate-shaped member is used, the overall weight of the rotational direction conversion device is reduced, and the mounting arm portion This structure can be easily adapted to the part of the device to which the rotation direction changing device is attached.

It is a figure which shows the whole structure of the rotation direction converter of this invention. It is a figure which shows the rotary body of the rotation direction converter of FIG. It is a figure which shows the reverse rotation mechanism part of the rotation direction converter of FIG. It is a figure which shows the intermediate | middle gear etc. of the rotation direction converter of FIG. It is a figure explaining the action | operation of the rotation direction converter of FIG. It is a figure which shows the structure of the conventional rotation direction converter.

Hereinafter, the rotation direction conversion device of the present invention will be described with reference to the drawings.
As shown in the overall view of FIG. 1, the rotational direction conversion device of the present invention includes an input shaft IS and an output shaft OS that are concentrically arranged to face each other. The input shaft IS is a shaft having a stepped portion, and a small-diameter portion ISS is formed at the tip, and the small-diameter portion ISS is a central hole of a plate-like gear support member 1 (detailed structure will be described later). And extends in the direction of the output shaft OS. The gear support member 1 is a fixed connecting member for attaching the rotation direction conversion device of the present invention to a copying machine or the like to which the present invention is applied. The input shaft IS has a stepped portion on the side surface of the gear support member 1. It is supported so as to be rotatable.

  The rotation direction changing device is provided with an outer rotating body 2 whose outer shape is cylindrical, and an output shaft OS is fitted on the end face thereof. As shown in the left side view of FIG. 1, the output shaft OS is formed with a flat portion for preventing rotation by cutting off a part of a circular cross-sectional shape. It is attached to rotate integrally.

As shown in FIG. 2 which is a single product diagram, the outer rotating body 2 is an outer internal gear plate 2B in which a first internal gear IG1 is formed at the end of the outer rotating body main body 2A in a substantially half length in the axial direction. Are fitted together. That is, the outer rotating body 2 is divided into two members, but one outer rotating body 2A is a cup-shaped member having stepped space portions 21 and 22, and has a small diameter. A first one-way clutch OC1 (see FIG. 1) is fixed to the space portion 21, and the inner rotator 3 is rotatably accommodated in the large-diameter space portion 22 in a coaxial state.
As shown in FIG. 2, a second internal gear IG2 having the same shape as the first internal gear IG1 is formed on one end surface of the inner rotating body 3, and a space portion 31 is formed on the opposite side. A second one-way clutch OC2 is fitted into and fixed to the space 31 (see FIG. 1).

  The first one-way clutch OC1 of the outer rotating body 2 and the second one-way clutch OC2 of the inner rotating body 3 are ring-shaped parts, and the inner diameter sides thereof are respectively fitted and fixed to the small-diameter portion ISS of the input shaft IS. ing. In this embodiment, these one-way clutches are roller-type one-way clutches as shown in FIGS. 6A and 6B. The first one-way clutch OC1 and the second one-way clutch OC2 are In accordance with forward / reverse rotation of the input shaft IS, one of them is connected to the input shaft IS and rotates together, and the other operates to idle.

As shown in FIG. 3, there is a gap between the first internal gear IG1 fixed to the outer rotating body 2 (outer internal gear plate 2B) and the second internal gear IG2 fixed to the inner rotating body 3. Three sets of intermediate gears MGA and MGB in which two gears are set are arranged. As shown in FIG. 4, the intermediate gears MGA and MGB are gears of the same form in which a cylindrical part s is coupled to a gear part g forming a gear, and are opposed to each other on a support shaft 11 erected on the gear support member 1. It is inserted into and pivotally supported. As a result, the cylindrical portions s of the intermediate gears MGA and MGB function as a spacer for determining the axial position of the gear portion g, and the gear portions g of both intermediate gears mesh with each other in a part in the axial direction ( In addition to the cross section BB in FIG. 2, in the remaining part, the intermediate gear MGA is the first internal gear IG1 (cross section AA in FIG. 2), and the intermediate gear MGB is the second internal gear IG2 (FIG. 2). Of the cross section C-C).
That is, the first internal gear IG1 and the second internal gear IG2 are gear-coupled to the two intermediate gears MGA and MGB that are supported by the fixed gear support member 1 and rotate in the opposite directions, respectively, The rotating body 2 and the inner rotating body 3 are rotationally driven in opposite directions. Since the rotational axes of both rotating bodies are parallel, a normal spur gear is used for each gear of this embodiment, and the tooth profile is a cycloid gear with high tooth strength based on a cycloid tooth profile curve. It has become.

Next, the operation of the rotation direction conversion device of the present invention will be described with reference to FIG.
As shown in FIG. 5A, when the input shaft IS rotates in the forward direction (for the sake of convenience, the clockwise rotation as viewed from the right is assumed to be the forward rotation), the first one-way clutch OC1 of the outer rotating body 2 is connected. The outer rotating body 2 rotates in the same direction together with the input shaft IS and is transmitted to the output shaft OS as it is, so that the output shaft OS rotates forward. Although the forward rotation of the outer rotator 2 reverses the inner rotator 3 via the intermediate gears MGA and MGB (see the broken line in FIG. 5A), the second one-way clutch OC2 of the inner rotator 3 rotates inward. Since the idle rotation occurs when the body 3 is reversed, the reverse rotation of the inner rotating body 3 does not adversely affect the input shaft IS.

  As shown in FIG. 5B, when the input shaft IS reversely rotates, the second one-way clutch OC2 of the inner rotator 3 is in a connected state, the first one-way clutch OC1 is idled, and the outer rotator 2 Is disconnected from the input shaft IS. The reverse rotation of the inner rotating body 3 causes the outer rotating body 2 to rotate forward via the second internal gear IG2, the intermediate gear MGB, the intermediate gear MGA, and the first internal gear IG1, and an output integrated therewith. The axis OS is rotated forward.

  In the rotation direction conversion device of the present invention, the outer rotator 2 is a component having the largest diameter, and a housing for housing the rotator is not provided outside thereof. As shown in FIG. 4, the gear support member 1 that fixes and supports the rotation direction conversion device is a plate-like member that includes a disk portion 12 having the same outer diameter as the outer rotating body 2 and an arm portion 13 for attachment. Therefore, the entire rotation direction changing device is reduced in size, and in particular, the radial dimension is reduced. The arm portion 13 is a portion that functions as a mounting bracket. However, since the arm portion 13 has a plate shape, it can be easily formed in a shape suitable for a part such as a copying machine to which the rotation direction changing device is mounted.

  The outer rotator 2 is divided into an outer rotator main body 2A for housing the inner rotator 3 and an outer internal gear plate 2B. The end surface of the inner rotator 3 abuts the outer internal gear plate 2B and The end face of the internal gear plate 2B is in contact with the gear support member 1, and both rotating bodies are supported in the thrust direction. Further, since the intermediate gears MGA and MGB are also supported in the thrust direction on the end surfaces of the gear support member 1 and the inner rotator 3, the axis of the rotator does not tilt, and the outer rotator 2, the inner rotator 3, etc. Can be rotated in a stable state.

  As described above in detail, the present invention provides a rotation direction conversion device that rotates an output shaft in one direction regardless of whether the input shaft is rotated forward or backward. The rotating body is installed concentrically, and the output shaft is rotated in one direction by using two one-way clutches and a reverse rotation mechanism to constitute a compact device. In the above embodiment, a roller-type one-way clutch is used as the one-way clutch. It goes without saying that can be used. Also, instead of the intermediate gear of the above embodiment in which the gear portion and the cylindrical portion are integrated, these are fitted as separate parts into the shaft of the gear support member, or the involute tooth profile or the like as the tooth profile of each gear Obviously, various modifications can be made to the above-described embodiment, such as adopting a special-shaped tooth pattern.

DESCRIPTION OF SYMBOLS 1 Gear support member 2 Outer rotating body 2A Outer rotating body main body 2B Outer internal gear plate 3 Inner rotating body IS Input shaft OS Output shaft OC1, OC2 One-way clutch IG1, IG2 Internal gear MGA, MGB Intermediate gear

Claims (5)

A rotation direction conversion device comprising an input shaft and an output shaft arranged concentrically and rotating the output shaft in one direction regardless of the rotation direction of the input shaft,
An outer rotating body that rotates integrally with the output shaft is attached to the output shaft, and an inner rotating body is installed concentrically with the outer rotating body inside the outer rotating body.
The outer rotator and the inner rotator are each connected to the input shaft via a one-way clutch, and according to the rotation direction of the input shaft, either the outer rotator or the inner rotator is It is configured to be connected to the input shaft, and
An internal gear is fixed to each of the outer rotary body and the inner rotary body, and both the internal gears rotate in opposite directions via an intermediate gear that is pivotally supported by a fixed gear support member. The rotation direction changing device is characterized by being connected in such a manner. The rotational direction conversion device according to claim 1, wherein both of the internal gears are internal gears having the same shape and are arranged in parallel in the axial direction. The intermediate gear that connects both the internal gears is a combination of two gears having the same shape, and each of the two gears meshes with each other in a part in the axial direction, and the remaining gears. 3. The rotation direction conversion device according to claim 2, wherein, in the portion, one gear meshes with the internal gear of the outer rotator, and the other gear meshes with the internal gear of the inner rotator. The rotational direction conversion device according to claim 2 or 3, wherein the outer rotating body is a combination of members divided in two in the axial direction, and the internal gear is formed on one member. The gear support member that pivotally supports the intermediate gear is a plate-like member that includes a disk portion equal to the outer diameter of the outer rotating body and an arm portion for attachment. The rotation direction changing device as described.