JP2010216536A - Unidirectional rotation transmitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a unidirectional rotation transmitting device having simple construction for actualizing stable rotation transmitting operation. <P>SOLUTION: The unidirectional rotation transmitting device includes input and output shafts 1, 2 arranged on the same axial center, a pair of opposed bevel gears 3, 4 rotatably fitted into the outer periphery of the input shaft 1, an intermediate bevel gear 5 for meshing with both opposed bevel gears 3, 4, the output shaft 2 and one opposed bevel gear 3 being connected to each other to be integrally rotated, and a first unidirectional clutch 6 for transmitting the positive rotation of the input shaft 1 to one opposed bevel gear 3 and a second unidirectional clutch 7 for transmitting the reverse rotation of the input shaft 1 to the other opposed bevel gear 4, whereby both positive and reverse rotation input to the input shaft 1 is converted into position rotation to be output to the output shaft 2. Thus, it uses a smaller number of components compared with a conventional device in which three unidirectional clutches are incorporated, for hardly causing troubles due to the axial-center misalignment of the clutches when rotated. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a unidirectional rotation transmission device that converts forward and reverse bi-directional rotation input to an input shaft into unidirectional rotation and outputs the unidirectional rotation to an output shaft.

  Some drive units of a copying machine or the like are required to input forward and reverse rotations from a rotational drive source or a reciprocating drive source to an input shaft and to output a one-way rotation to an output shaft. In such a drive unit, a unidirectional rotation transmission device that converts forward / reverse bidirectional rotation input from the drive source to the input shaft into unidirectional rotation and outputs the unidirectional rotation to the output shaft may be used.

  As the one-way rotation transmission device as described above, for example, the one shown in FIGS. 13 and 14 has been proposed (see Patent Document 1). As shown in FIG. 13, the one-way rotation transmission device includes input / output shafts 51 and 52 arranged on the same axis, and a pair of opposed bevel gears 53 that are rotatably fitted on the outer periphery of the output shaft 52. 54, an intermediate bevel gear 55 that meshes with both opposing bevel gears 53, 54, a first one-way clutch 56 disposed between the input shaft 51 and the output shaft 52, and the input shaft 51 and one opposing bevel gear 53. And a third one-way clutch 58 arranged between the other opposed bevel gear 54 and the output shaft 52.

  Each of the one-way clutches 56, 57, and 58 is provided with a plurality of inclined cam surfaces 60 on the inner peripheral surface of the outer ring 59, as shown in FIGS. 14 (a), (b), and (c). Rollers 61 are arranged at circumferential positions where 60 is provided, and each roller 61 is pressed by a spring 62 in a direction locked by a cam surface 60. Among them, the first and third one-way clutches 56 and 58 are incorporated so that each roller 61 is locked by the cam surface 60 when the outer ring 59 rotates forward (left rotation in the figure). The one-way clutch 57 is incorporated so that each roller 61 is locked by the cam surface 60 when the outer ring 59 rotates in the reverse direction (right rotation in the drawing).

  Accordingly, the first and third one-way clutches 56 and 58 rotate when the input shaft 51 or the other opposed bevel gear 54 that rotates integrally with the respective outer ring 59 rotates forward or when the output shaft 52 rotates backward. The second one-way clutch 57 transmits the rotation when the input shaft 51 that rotates integrally with the outer ring 59 rotates in the reverse direction or when one counter bevel gear 53 rotates in the forward direction.

  Next, an operation when rotation is input from the drive source to the input shaft 51 will be described. In FIG. 13 and FIG. 14, the operation when the input shaft 51 rotates forward is indicated by a solid arrow, and the operation when the input shaft 51 rotates reversely is indicated by a one-dot chain arrow.

  When the input shaft 51 rotates in the forward direction, the forward rotation is transmitted to the output shaft 52 by the first one-way clutch 56. At this time, the second one-way clutch 57 does not transmit the positive rotation of the input shaft 51 to one opposing bevel gear 53, and the third one-way clutch 58 transmits the positive rotation of the output shaft 52 to the other opposing bevel gear 53. Since it does not transmit to 54, each bevel gear 53, 54, 55 remains stopped. On the other hand, when the input shaft 51 rotates in the reverse direction, the reverse rotation is transmitted to the one counter bevel gear 53 by the second one-way clutch 57 and forwardly rotates to the other counter bevel gear 54 via the intermediate bevel gear 55. As transmitted. The forward rotation of the other counter bevel gear 54 is transmitted to the output shaft 52 by the third one-way clutch 58. At this time, the first one-way clutch 56 does not transmit rotation because the input shaft 51 rotates in the reverse direction and the output shaft 52 rotates in the forward direction at the same time. That is, in this one-way rotation transmission device, forward rotation is output to the output shaft 52 regardless of whether forward or reverse rotation is input to the input shaft 51.

JP 2004-84783 A (FIGS. 1 to 3)

  Since the conventional one-way rotation transmission device described above incorporates three one-way clutches, the number of parts is large, and the shaft center of each clutch shifts during rotation, resulting in uneven transmission torque or large operating torque. There is a difficulty that it is easy to become.

  Therefore, an object of the present invention is to provide a one-way rotation transmission device that has a simple structure and can obtain a stable rotation transmission operation.

  In order to solve the above-mentioned problems, the present invention provides a first means in which an input shaft and an output shaft are arranged on the same axis, and forward / reverse bi-directional rotation input to the input shaft is converted into unidirectional rotation. In the one-way rotation transmission device that outputs to the output shaft, a pair of opposed bevel gears are arranged on the same axis as the input / output shaft, an intermediate bevel gear that meshes with both the opposed bevel gears is provided, and the output A first one-way clutch that connects the shaft and one opposing bevel gear so as to rotate integrally, and transmits a positive rotation of the input shaft to the output shaft or one opposing bevel gear; and a reverse rotation of the input shaft Is provided to the other opposed bevel gear.

  That is, according to the configuration of the first means, when the input shaft rotates forward, the forward rotation is transmitted to the output shaft or one opposed bevel gear that rotates integrally with the output shaft by the first one-way clutch, When the input shaft rotates in the reverse direction, the reverse rotation is transmitted to the other counter bevel gear by the second one-way clutch and then transmitted as a normal rotation to the one counter bevel gear and the output shaft via the intermediate bevel gear. As a result, two one-way clutches can be incorporated into the one-way rotation transmission device. As a result, the number of parts can be reduced as compared with a conventional device incorporating three one-way clutches, and problems due to misalignment of the respective shafts during rotation can be reduced.

  In addition, as a second means, the present invention arranges the input shaft and the output shaft on the same axis, converts forward and reverse bi-directional rotation input to the input shaft into one-way rotation, and outputs it to the output shaft. In the one-way rotation transmission device, a pair of opposed bevel gears are arranged on the same axis as the input / output shaft, an intermediate bevel gear meshing with both the opposed bevel gears is provided, and the input shaft and one opposed bevel A first one-way clutch that connects the gear and the output shaft to transmit the positive rotation of the input shaft or one counter bevel gear to the output shaft, and the positive rotation of the other counter bevel gear to the output A second one-way clutch that transmits to the shaft was provided.

  That is, according to the configuration of the second means, when the input shaft rotates in the forward direction, the forward rotation of the one counter bevel gear that rotates forward or integrally with the input shaft is used as the output shaft by the first one-way clutch. When the input shaft rotates in the reverse direction, the reverse rotation is transmitted as a normal rotation to the other counter bevel gear via the one counter bevel gear and the intermediate bevel gear, and then output by the second one-way clutch. Since it can be transmitted to the shaft, like the first means, only two one-way clutches can be incorporated in the one-way rotation transmission device, so that the number of parts can be reduced and the problems due to the misalignment of each clutch can be reduced.

  In the first means or the second means, the first one-way clutch and the second one-way clutch have the same specifications, thereby facilitating parts management of the one-way clutch before assembly. Can do.

  If at least one of the pair of opposed bevel gears is provided with a rotation transmitting means capable of transmitting the rotation to and from an external rotating member, the opposing bevel gear having the rotation transmitting means has an input shaft or The entire device can be made compact in the axial direction while also serving as the output shaft.

  A ring gear can be adopted as the rotation transmitting means.

  As described above, the one-way rotation transmission device of the present invention uses two one-way clutches to convert forward and reverse bi-directional rotation input to the input shaft into one-way rotation and output it to the output shaft. As a result, it has a simple structure with fewer parts compared to a conventional device incorporating three one-way clutches, and is less susceptible to malfunctions due to misalignment of each clutch shaft during rotation. Operation is obtained.

Front sectional view of the one-way rotation transmission device of the first embodiment a and b are sectional views taken along lines AA and BB in FIG. 1, respectively. Front sectional view of the unidirectional rotation transmission device of the second embodiment a and b are sectional views taken along lines AA and BB in FIG. 3, respectively. Front sectional view of the one-way rotation transmission device of the third embodiment a and b are sectional views taken along lines AA and BB in FIG. 5, respectively. Front sectional view of the unidirectional rotation transmission device of the fourth embodiment a and b are sectional views taken along lines AA and BB in FIG. 7, respectively. Front sectional view of the one-way rotation transmission device of the fifth embodiment a and b are sectional views taken along lines AA and BB in FIG. 9, respectively. Front sectional view of the unidirectional rotation transmission device of the sixth embodiment a and b are sectional views taken along lines AA and BB in FIG. 11, respectively. Front sectional view of a conventional one-way rotation transmission device a, b, and c are cross-sectional views taken along lines AA, BB, and CC, respectively, of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment. As shown in FIG. 1, the one-way rotation transmission device includes input / output shafts 1 and 2 arranged on the same axis, and a pair of opposed bevel gears 3 that are rotatably fitted on the outer periphery of the input shaft 1. 4, an intermediate bevel gear 5 that meshes with both opposed bevel gears 3, 4, a first one-way clutch 6 disposed between the input shaft 1 and one (output side) opposed bevel gear 3, and the input shaft 1. And a second one-way clutch 7 disposed between the other (input side) opposed bevel gear 4. The input shaft 1 and the output shaft 2 are rotatably supported by inner peripheral surfaces of through holes formed in both end lid portions 8a and 8b of the cylindrical casing 8, respectively. Further, the intermediate bevel gear 5 is rotatably fitted with a shaft portion 5a in a circular hole 8c formed in the inner peripheral surface of the casing 8. Although not shown, the casing 8 is divided into two parts so that the input / output shafts 1 and 2, the bevel gears 3, 4 and 5, and the one-way clutches 6 and 7 are integrated. It has become.

  The output shaft 2 is provided with two stages of a small-diameter cylindrical portion 2a that is rotatably supported by the casing lid portion 8b and a large-diameter cylindrical portion 2b to which the output-side counter bevel gear 3 is connected. The front end of the input shaft 1 is inserted into the cylindrical portions 2 a and 2 b of the output shaft 2 and is prevented from coming off by a retaining ring 9. Each of the opposed bevel gears 3 and 4 has cylindrical portions 3a and 4a for accommodating the one-way clutches 6 and 7, respectively. The opposed bevel gear 3 on the output side has a large cylindrical portion 3a of the output shaft 2. It is fitted in the inner periphery of the diameter cylinder portion 2b so as not to rotate, and rotates together with the output shaft 2.

  Each of the one-way clutches 6, 7 is provided with a plurality of inclined cam surfaces 11 on the inner peripheral surface of the outer ring 10, as shown in FIGS. 2 (a) and 2 (b). Rollers 12 as engaging elements are arranged at the directional positions, and each roller 12 is pressed by a spring 13 in a direction locked by the cam surface 11. Both the one-way clutches 6 and 7 have the same specifications, and in the first one-way clutch 6, each roller 12 is locked by the cam surface 11 when the outer ring 10 rotates in the reverse direction (right rotation in the figure). The second one-way clutch 7 is incorporated such that each roller 12 is locked by the cam surface 11 when the outer ring 10 rotates forward (left rotation in the figure).

  Accordingly, the first one-way clutch 6 transmits the rotation when the output-side counter bevel gear 3 that rotates integrally with the outer ring 10 rotates in the reverse direction or when the input shaft 1 rotates in the forward direction, and the second one-way clutch 6 The clutch 7 transmits rotation when the input-side counter bevel gear 4 that rotates integrally with the outer ring 10 rotates forward or when the input shaft 1 rotates reversely.

  Next, an operation when rotation is input to the input shaft 1 from a drive source (not shown) will be described. 1 and 2, the operation when the input shaft 1 rotates forward is indicated by a solid arrow, and the operation when the input shaft 1 rotates reversely is indicated by a dashed-dotted arrow (another embodiment to be described later is shown). Each figure is the same).

  When the input shaft 1 rotates in the forward direction, the forward rotation is transmitted to the opposed bevel gear 3 on the output side by the first one-way clutch 6, and the output shaft 2 rotates in the forward direction integrally with the bevel gear 3. At this time, the forward rotation of the counter bevel gear 3 on the output side is transmitted as a reverse rotation to the counter bevel gear 4 on the input side via the intermediate bevel gear 5, but the second one-way clutch 7 does not transmit the rotation. .

  On the other hand, when the input shaft 1 rotates in the reverse direction, the reverse rotation is transmitted to the input-side counter bevel gear 4 by the second one-way clutch 7. Then, the reverse rotation of the input-side counter bevel gear 4 is transmitted as a normal rotation to the output-side counter bevel gear 3 via the intermediate bevel gear 5, and the output shaft 2 rotates in the same direction as the bevel gear 3. At this time, the first one-way clutch 6 does not transmit rotation because the input shaft 1 rotates in the reverse direction and the output-side counter bevel gear 3 rotates in the forward direction at the same time.

  As described above, this one-way rotation transmission device uses the two one-way clutches 6 and 7 to output a normal rotation to the output shaft 2 regardless of whether forward or reverse rotation is input to the input shaft 1. As a result, it has a simple structure with a reduced number of parts compared to the above-mentioned conventional device incorporating three one-way clutches (FIGS. 13 and 14), and a problem due to the misalignment of each clutch during rotation. Is less likely to occur, and a stable rotation transmission operation can be obtained. Further, in the above-described conventional device, one of the one-way clutches has a different specification (diameter dimension) from the other, whereas in this device, each of the one-way clutches 6 and 7 has the same specification. Therefore, it is easy to manage parts of the one-way clutch before assembly.

  3 and 4 show a second embodiment. The one-way rotation transmission device of this embodiment is one in which two one-way clutches are incorporated in the same direction with the input side and output side of the first embodiment reversed. That is, as shown in FIG. 3, the input shaft 14 of this embodiment has the same configuration as the output shaft 2 of the first embodiment, and the output shaft 15 has the same configuration as the input shaft 1 of the first embodiment. As shown in FIGS. 4A and 4B, the first one-way clutch 16 disposed between one (input side) opposed bevel gear 3 and the output shaft 15, and the other (output side). The second one-way clutch 17 disposed between the counter bevel gear 4 and the output shaft 15 is incorporated so that the rollers 12 are locked by the cam surface 11 when the outer ring 10 rotates forward. Yes. The configuration of the other parts is the same as in the first embodiment.

  In this embodiment, when the input shaft 14 rotates positively integrally with the opposed bevel gear 3 on the input side, the normal rotation is transmitted to the output shaft 15 by the first one-way clutch 16. At this time, the forward rotation of the input-side counter bevel gear 3 is transmitted as a reverse rotation to the output-side counter bevel gear 4 via the intermediate bevel gear 5, but the second one-way clutch 17 does not transmit the rotation. .

  On the other hand, when the input shaft 14 rotates reversely integrally with the input-side counter bevel gear 3, the reverse rotation of the bevel gear 3 is transmitted as a normal rotation to the output-side counter bevel gear 4 via the intermediate bevel gear 5. The forward rotation of the output-side counter bevel gear 4 is transmitted to the output shaft 15 by the second one-way clutch 17. At this time, the first one-way clutch 16 does not transmit the rotation because the opposed bevel gear 3 on the input side rotates reversely and the output shaft 15 rotates forward at the same time.

  As described above, this embodiment also employs two one-way clutches 16 and 17 to construct a mechanism that converts forward and reverse bi-directional rotations input to the input shaft 14 into forward rotations and outputs them to the output shaft 15. Therefore, it has the same features as the first embodiment.

  5 and 6 (a) and 6 (b) show the third embodiment, and FIGS. 7 and 8 (a) and 8 (b) show the fourth embodiment, respectively. In each of these embodiments, the one-way rotation transmission device can transmit rotation between the pair of opposed bevel gears 3 and 4 of the first and second embodiments with an external rotation member (not shown). The ring gears 3b and 4b are provided as rotation transmission means, and the counter bevel gears 3 and 4 also serve as an output shaft or an input shaft.

  In each of these embodiments, a cylindrical casing 18 having both ends opened is used, and an intermediate portion between the cylindrical shaft 19a through which the input shaft 1 of the third embodiment or the output shaft 15 of the fourth embodiment is passed. A support member 19 including a cylindrical portion 19b that is passed through the shaft hole of the bevel gear 20 is provided. The support member 19 is fixed by bringing a part of the cylindrical portion 19a into contact with the inner peripheral surface of the casing 18 and fitting the column portion 19b into a circular hole 18a formed in the inner peripheral surface of the casing 18, The input shaft 1 or the output shaft 15 is rotatably supported by the inner peripheral surface of the cylindrical portion 19a, and the intermediate bevel gear 20 is rotatably supported by the column portion 19b. Further, the input shaft 1 or the output shaft 15 supported by the support member 19 is prevented from coming off by two retaining rings 9.

  And each counter bevel gears 3 and 4 transmit rotation with an external rotation member with the ring gears 3b and 4b provided in the site | part which protruded from the casing 18, and also serve as an output shaft or an input shaft. The output shaft 2 of the first embodiment (the input shaft 14 of the second embodiment) is unnecessary. Regarding the configuration of the other parts and the rotation transmission operation, the third embodiment is the same as the first embodiment, and the fourth embodiment is the same as the second embodiment. As a result, in the third and fourth embodiments, the entire apparatus is more compact in the axial direction than in the first and second embodiments.

  In addition, the rotation transmission means between the external rotation members provided in each counter bevel gear is not limited to the ring gear as in the embodiment, and a pulley or the like may be employed.

  9 and 10 show a fifth embodiment. As shown in FIG. 9, the one-way rotation transmission device of this embodiment is fitted to the input / output shafts 21 and 22 arranged on the same axis and the outer periphery of the input shaft 21 as in the first embodiment. A pair of opposed bevel gears 23, 24 and an intermediate bevel gear 25 meshing with both opposed bevel gears 23, 24 are provided. Each bevel gear 23, 24, 25 and two one-way clutches 26, 27 are cylindrical. It is accommodated in the casing 8. The configuration in which the input / output shafts 21 and 22 and the intermediate bevel gear 25 are rotatably supported by the casing 8 is the same as that of the first embodiment.

  On the other hand, the difference of this embodiment from the first embodiment is that the input shaft 21 and one (input side) counter bevel gear 23 are connected so as to rotate integrally, the input shaft 21 and the output shaft 22 A first one-way clutch 26 is disposed therebetween, and a second one-way clutch 27 having a larger radial dimension than the first one-way clutch 26 is provided between the other (output-side) counter bevel gear 24 and the output shaft 22. And that the one-way clutches 26 and 27 are assembled in the same direction.

  The output shaft 22 includes a small-diameter cylindrical portion 22a that is rotatably supported by the casing lid portion 8b and a large-diameter cylindrical portion 22b that accommodates the two one-way clutches 26 and 27 in two stages. Yes. The input-side counter bevel gear 23 rotates integrally with the input shaft 21 by key connection, and the output-side counter bevel gear 24 is inserted between the input shaft 21 and the second one-way clutch 27. A cylindrical portion 24a.

  The basic configuration of each of the one-way clutches 26 and 27 is the same as that of the first embodiment. Each one-way clutch 26, 27 is assembled so that each roller 12 is locked by the cam surface 11 when the outer ring 10 rotates in the reverse direction, as shown in FIGS. 10 (a) and 10 (b). It is. That is, the first one-way clutch 26 transmits rotation when the input shaft 21 rotates forward, and the second one-way clutch 27 transmits rotation when the output-side counter bevel gear 24 rotates forward. It has become.

  Therefore, when the input shaft 21 rotates positively integrally with the input-side counter bevel gear 23, the normal rotation is transmitted to the output shaft 22 by the first one-way clutch 26. At this time, the forward rotation of the input-side counter bevel gear 23 is transmitted as a reverse rotation to the output-side counter bevel gear 24 via the intermediate bevel gear 25, but the second one-way clutch 27 does not transmit the rotation. .

  On the other hand, when the input shaft 21 reversely rotates integrally with the input-side counter bevel gear 23, the reverse rotation of the bevel gear 23 is transmitted as a normal rotation to the output-side counter bevel gear 24 via the intermediate bevel gear 25. The The forward rotation of the output-side counter bevel gear 24 is transmitted to the output shaft 22 by the second one-way clutch 27. At this time, the first one-way clutch 26 does not transmit rotation because the input shaft 21 rotates in the reverse direction and the output shaft 22 rotates in the forward direction at the same time.

  11 and 12 show a sixth embodiment. The one-way rotation transmission device of this embodiment is constructed by incorporating two one-way clutches in the reverse direction with the input side and output side of the fifth embodiment reversed. That is, as shown in FIG. 11, the input shaft 28 of this embodiment has the same configuration as the output shaft 22 of the fifth embodiment, and the output shaft 29 has the same configuration as the input shaft 21 of the fifth embodiment. As shown in FIGS. 12A and 12B, the first one-way clutch 30 disposed between the input shaft 28 and the output shaft 29 is configured so that each roller 12 is rotated when the outer ring 10 rotates forward. The second one-way clutch 31 that is incorporated so as to be locked by the cam surface 11 and disposed between the input shaft 28 and the other (input side) counter bevel gear 24 is configured so that each of the outer rings 10 rotates in the reverse direction. The roller 12 is incorporated so as to be locked by the cam surface 11. The structure of other parts is the same as that of the fifth embodiment.

  In this embodiment, when the input shaft 28 rotates in the forward direction, the forward rotation is transmitted to the output shaft 29 by the first one-way clutch 30. At this time, the forward rotation of the output-side counter bevel gear 23 that rotates integrally with the output shaft 29 is transmitted as a reverse rotation to the input-side counter bevel gear 24 via the intermediate bevel gear 25, but the second one-way clutch 31 does not transmit rotation.

  On the other hand, when the input shaft 28 rotates in the reverse direction, the reverse rotation is transmitted to the counter bevel gear 24 on the input side by the second one-way clutch 31. Then, the reverse rotation of the input-side counter bevel gear 24 is transmitted as a normal rotation to the output-side counter bevel gear 23 via the intermediate bevel gear 25, and the output shaft 29 rotates positively integrally with the bevel gear 23. At this time, the first one-way clutch 30 does not transmit rotation because the input shaft 28 rotates reversely and the output shaft 29 rotates forward at the same time.

  That is, in the fifth and sixth embodiments described above, as in the first to fourth embodiments, the forward / reverse bidirectional rotation input to the input shaft is converted into the forward rotation using two one-way clutches. Thus, a mechanism for outputting to the output shaft can be constructed.

  In each of the above-described embodiments, the one-way clutch using a roller as an engagement element is used. However, other types of one-way clutches using a sprag or the like as an engagement element may be used.

1, 14, 21, 28 Input shaft 2, 15, 22, 29 Output shaft 3, 4, 23, 24 Opposite bevel gears 3b, 4b Ring gears 5, 20, 25 Intermediate bevel gears 6, 16, 26, 30 First One-way clutches 7, 17, 27, 31 Second one-way clutches 8, 18 Casing 10 Outer ring 11 Cam surface 12 Roller 13 Spring 19 Support member

Claims (5)

  In the one-way rotation transmission device, wherein the input shaft and the output shaft are arranged on the same axis, and the forward / reverse bidirectional rotation input to the input shaft is converted into one-way rotation and output to the output shaft, the input / output shaft A pair of opposed bevel gears on the same axis and providing an intermediate bevel gear that meshes with both of these opposed bevel gears, and connecting the output shaft and one opposed bevel gear so as to rotate integrally, Provided is a first one-way clutch that transmits the forward rotation of the input shaft to the output shaft or one counter bevel gear, and a second one-way clutch that transmits the reverse rotation of the input shaft to the other counter bevel gear. One-way rotation transmission device characterized by that.   In the one-way rotation transmission device, wherein the input shaft and the output shaft are arranged on the same axis, and the forward / reverse bidirectional rotation input to the input shaft is converted into one-way rotation and output to the output shaft, the input / output shaft A pair of opposed bevel gears on the same axis, and providing an intermediate bevel gear that meshes with both the opposed bevel gears, and connecting the input shaft and one opposed bevel gear so as to rotate integrally, A first one-way clutch that transmits a positive rotation of the input shaft or one opposed bevel gear to the output shaft; and a second one-way clutch that transmits a positive rotation of the other opposed bevel gear to the output shaft. A one-way rotation transmission device provided.   The one-way rotation transmission device according to claim 1 or 2, wherein the first one-way clutch and the second one-way clutch have the same specifications.   4. One-way according to claim 1, wherein at least one of the pair of opposed bevel gears is provided with a rotation transmission means capable of transmitting rotation with an external rotation member. Rotation transmission device.   The one-way rotation transmission device according to claim 4, wherein the rotation transmission means is a ring gear.

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