JP5563492B2 - Unidirectional rotation transmission device - Google Patents

Description

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

  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.

  An example of the one-way rotation transmission device as described above is described in Patent Document 1. In Patent Document 1, an input / output shaft and a pair of opposed bevel gears are arranged on the same axis, an intermediate bevel gear that meshes with both the opposed bevel gears is provided, and an output shaft and one opposed bevel gear are provided. A first one-way clutch that is connected so as to rotate integrally and transmits the positive rotation of the input shaft to the output shaft or one of the opposed bevel gears, and the second one that transmits the reverse rotation of the input shaft to the other opposed bevel gear. A one-way rotation transmission device provided with a one-way clutch and one in which two one-way clutches transmit rotation in the same direction by reversing the input side and the output side have been proposed.

JP 2010-216536 A

  However, since the one-way rotation transmission device described in Patent Document 1 is integrated as a device with an input / output shaft inserted therethrough, when the device is incorporated into an external device such as a copying machine, the input It is necessary to connect the shaft to the external drive shaft and the output shaft to the external driven shaft by coupling or the like, respectively. In particular, when the external drive shaft and the driven shaft are long, the installation space may not be available.

  Accordingly, an object of the present invention is to provide a one-way rotation transmission device that can be easily incorporated into an external mechanical device.

  In order to solve the above problems, a unidirectional rotation transmission device of the present invention is disposed between an external input shaft and an output rotation member that rotate around mutually parallel axes, and is inserted through the input shaft. Two opposed bevel gears, an intermediate bevel gear that meshes with both opposed bevel gears, a first one-way clutch that transmits forward rotation of the input shaft to one opposed bevel gear, and reverse rotation of the input shaft to the other A second one-way clutch that transmits to the opposite bevel gear, wherein the one opposite bevel gear includes rotation transmission means that enables rotation transmission to and from the output rotation member, and from the input shaft A configuration was adopted in which the input forward and reverse bi-directional rotations were converted into unidirectional rotations and output to the output rotating member.

  Alternatively, two opposed bevel gears that are arranged between an external input rotating member that rotates around parallel axes and an output shaft, and that are inserted through the output shaft, and an intermediate umbrella that meshes with the opposed bevel gears. A gear, a first one-way clutch that transmits the positive rotation of the one opposed bevel gear to an output shaft, and a second one-way clutch that transmits the positive rotation of the other opposed bevel gear to the output shaft. The one counter bevel gear has a rotation transmitting means that enables rotation transmission to and from the input rotating member, and the forward and reverse bi-directional rotation input from the input rotating member is converted into a one-way rotation. A configuration for outputting to the output shaft may be employed.

  If one of the two types of configurations described above is adopted, it is incorporated into an external mechanical device by insertion of an external input shaft or output shaft. It can be large and easy to incorporate.

  In each of the above configurations, an intermediate shaft having a shaft portion in which the intermediate bevel gear is rotatably fitted and a cylindrical portion that is rotatably fitted on the outer periphery of the input shaft or the output shaft is provided, and the intermediate shaft and the intermediate umbrella are provided. The gear, the other opposing bevel gear, and the second one-way clutch are incorporated into a cylindrical housing having a lid that opens at one end and passes the input shaft or output shaft at the other end. It is desirable to prevent the gear from coming off by being rotatably engaged with the cylindrical portion of the intermediate shaft. In this way, all members can be integrated (unitized) so that they do not come apart without inserting an external input shaft or output shaft. It will be easy to handle.

  Here, the cylindrical portion of the intermediate shaft and the one opposing bevel gear may be formed of synthetic resin and engaged by snap fit. The lid portion of the housing may be formed separately from the main body portion.

  Further, if the housing is provided with means for supporting the shaft portion of the intermediate shaft and restricting the movement of the intermediate shaft in the housing axial direction, the axial direction of the housing can be achieved even if a thrust force is generated by the rotation of each bevel gear. The movement of the intermediate shaft can be suppressed, and an increase in rotational torque due to the movement of the intermediate shaft can be prevented.

  As a means for restricting the movement of the intermediate shaft, the tip end portion of the shaft portion of the intermediate shaft is inserted from the lid portion side to the center portion on the inner peripheral surface of the main body portion formed separately from the lid portion of the housing. And a stopper inserted into the shaft support groove is provided on the inner side surface of the lid, and the tip of the shaft portion of the intermediate shaft is formed by the stopper and the inner end wall of the shaft support groove. What is pinched | interposed can be employ | adopted.

  Alternatively, as another means for restricting the movement of the intermediate shaft, the housing is made of synthetic resin, and the distal end portion of the shaft portion of the intermediate shaft extends from the opening side to the central portion on the inner peripheral surface of the main body portion of the housing. A shaft support groove to be inserted is provided, a protrusion is provided in the middle of the shaft support groove, and the protrusion and the inner end wall of the shaft support groove sandwich the tip of the shaft portion of the intermediate shaft. You can also.

  As described above, the one-way rotation transmission device of the present invention is incorporated into an external mechanical device by inserting an external input shaft or output shaft, so that the mechanical device having a long input shaft or output shaft is used. It can be easily assembled without coupling.

  Further, since the rotation transmission device itself does not have an input / output shaft, there is an advantage that the structure of the device can be simplified, the size can be reduced, and the cost can be reduced.

Front sectional view of the one-way rotation transmission device of the first embodiment Sectional drawing of the principal part along the II-II line of FIG. a and b are sectional views taken along lines IIIa-IIIa and IIIb-IIIb 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 Va-Va and Vb-Vb in FIG. 4, respectively. a is a front sectional view showing a modification of the intermediate shaft support structure, and b is a sectional view taken along line VI-VI of a. a is a front sectional view showing another modification of the intermediate shaft support structure, and b is a sectional view taken along line VII-VII of a. a is a front sectional view showing still another modification of the intermediate shaft support structure, and b is a sectional view taken along line VIII-VIII of a.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment. As shown in FIG. 1, the one-way rotation transmission device is arranged between an external input shaft A and an output rotation member (not shown) that rotate around mutually parallel axes, and is inserted through the input shaft A. Two opposed bevel gears 1 and 2, an intermediate bevel gear 3 meshing with both opposed bevel gears 1 and 2, an intermediate shaft 4 having a shaft portion 4a into which the intermediate bevel gear 3 is rotatably fitted, and an input shaft A And a first one-way clutch 5 disposed between one (left side of the drawing) opposed bevel gear 1 and a second one disposed between the input shaft A and the other (right side of the drawing) opposed bevel gear 2. And a directional clutch 6. The other opposite bevel gear 2, the intermediate bevel gear 3, the intermediate shaft 4, and the second one-way clutch 6 have a cylindrical housing having a lid 7 that opens at one end and passes the input shaft A at the other end. 8 is built in. Of these constituent members, the opposing bevel gears 1 and 2 and the intermediate shaft 4 are each made of synthetic resin. Other members may be made of metal or synthetic resin.

  The one counter bevel gear 1 includes a ring gear 1a serving as a rotation transmission means that enables rotation transmission between the external output rotation member and an engagement portion that engages with the intermediate shaft 4 as will be described later. 1b. The rotation transmission means is not limited to the ring gear, and a pulley or the like can be employed. Further, a lid 9 through which the input shaft A is passed is fitted on the inner periphery on one end side thereof, and the first one-way clutch 5 is prevented from coming off.

  The intermediate shaft 4 is integrally formed with a shaft portion 4 a into which the intermediate bevel gear 3 is fitted and a cylindrical portion 4 b that is rotatably fitted into the outer periphery of the input shaft A. Moreover, it has the engaging part 4c engaged with the engaging part 1b of one opposing bevel gear 1 in the end of the cylinder part 4b.

  Here, as shown in FIGS. 1 and 2, the engaging portion 1 b of the one opposing bevel gear 1 is formed by projecting four engaging pieces 1 c on the inner peripheral side of the bevel gear 1, The engaging part 4c of the shaft 4 is provided with an outward claw at the tip of four engaging pieces 4d inserted on the inner peripheral side of the engaging part 1b of one opposing bevel gear 1. A gap in the circumferential direction is formed between the engagement pieces 1c of one opposed bevel gear 1 and between the engagement pieces 4d of the intermediate shaft 4, and the one opposed bevel gear 1 is intermediated by a snap fit. The shaft 4 is rotatably engaged.

  The housing 8 has a lid portion 7 and a cylindrical main body portion 8a having both ends opened separately, and the lid portion 7 is fitted into the inner periphery of the other end portion of the main body portion 8a. Each component incorporated in the housing 8 is prevented from coming off. Further, a shaft support groove 8b into which the tip of the shaft portion 4a of the intermediate shaft 4 is inserted from the lid portion 7 side (the other end side) to the center portion is provided on the inner peripheral surface of the main body portion 8a. 4 is assembled in a state in which the tip of the shaft portion 4a is brought into contact with the inner end wall (wall surface of the groove end at the center of the housing 8) 8c of the shaft support groove 8b, and is pulled out to the opening side (one end side) of the housing 8. There is no such thing.

  As described above, the intermediate shaft 4 is prevented from being detached by the housing 8, so that the one counter bevel gear 1 engaged with the intermediate shaft 4 is also prevented from coming off. Therefore, in this one-way rotation transmission device, even when the input shaft A is not inserted, all the structural members can be integrated (unitized) so as not to be scattered.

  Each of the one-way clutches 5, 6 is provided with a plurality of inclined cam surfaces 11 on the inner peripheral surface of the outer ring 10 as shown in FIGS. 3A and 3B, respectively. 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 5 and 6 have the same specification, and in the first one-way clutch 5, 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 6 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 5 transmits the rotation when one counter bevel gear 1 that rotates integrally with the outer ring 10 rotates reversely or when the input shaft A rotates forward, and the second one-way clutch 5 6 transmits rotation when the other counter bevel gear 2 that rotates integrally with the outer ring 10 rotates forward or when the input shaft A rotates backward.

  Next, an operation when rotation is input to the input shaft A from a drive source (not shown) will be described. In FIG. 1 and FIG. 3, the operation when the input shaft A rotates forward is indicated by a solid arrow, and the operation when the input shaft A rotates reversely is indicated by a one-dot chain line arrow (the second embodiment described later is shown). The same is true for each figure shown).

  When the input shaft A rotates forward, the forward rotation is transmitted to the one opposing bevel gear 1 by the first one-way clutch 5, and the forward rotation of the bevel gear 1 is output to the external output rotating member. . At this time, the forward rotation of one counter bevel gear 1 is transmitted as a reverse rotation to the other counter bevel gear 2 via the intermediate bevel gear 3, but the second one-way clutch 6 does not transmit the rotation.

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

  As described above, this one-way rotation transmission device outputs rotation in one direction to the output rotation member regardless of whether forward or reverse rotation is input from the input shaft A, and can be incorporated into an external mechanical device. Since it is performed by inserting the input shaft A, it can be easily incorporated into a mechanical device having a long input shaft A without coupling.

  4 and 5 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, the external input rotation member of this embodiment has the same configuration as the output rotation member of the first embodiment (not shown), and the external output shaft B has the same configuration as the input shaft A of the first embodiment ( (See FIG. 4). And as shown to Fig.5 (a), (b), the 1st one-way clutch 14 distribute | arranged between one opposing bevel gear 1 and the output shaft B, and the other opposing bevel gear 2 and output shaft. Each of the second one-way clutches 15 arranged between B is incorporated such that each roller 12 is locked by the cam surface 11 when the outer ring 10 rotates forward. The configuration of the other parts is the same as in the first embodiment.

  In this embodiment, when a forward rotation is input from the external input rotating member to one of the opposed bevel gears 1, the forward rotation is transmitted to the output shaft B by the first one-way clutch 14. At this time, the forward rotation of one counter bevel gear 1 is transmitted as reverse rotation to the other counter bevel gear 2 via the intermediate bevel gear 3, but the second one-way clutch 15 does not transmit the rotation.

  On the other hand, when reverse rotation is input from the external input rotating member to one counter bevel gear 1, the reverse rotation of the bevel gear 1 is transmitted to the other counter bevel gear 2 as normal rotation via the intermediate bevel gear 3. Is done. The forward rotation of the other counter bevel gear 2 is transmitted to the output shaft B by the second one-way clutch 15. At this time, the first one-way clutch 14 does not transmit rotation because the one counter bevel gear 1 rotates in the reverse direction and the output shaft B rotates in the forward direction at the same time.

  As described above, the one-way rotation transmission device of this embodiment outputs a one-way rotation to the output shaft B regardless of whether forward or reverse rotation is input from the input rotation member, and to an external mechanical device. Is performed by inserting the output shaft B, so that it can be easily incorporated into a machine having a long output shaft B without coupling.

  6 to 8 show modifications of the support structure for the intermediate shaft 4. In the example shown in FIGS. 6A and 6B, a rod-like stopper 7a to be inserted into the shaft support groove 8b of the main body portion 8a is provided on the inner surface of the lid portion 7 of the housing 8, and the stopper 7a and the shaft support are provided. The tip end portion of the shaft portion 4a of the intermediate shaft 4 is sandwiched between the inner end wall 8c of the groove 8b and the movement of the intermediate shaft 4 in the axial direction of the housing 8 is restricted. Therefore, even if a thrust force is generated by the rotation of the bevel gears 1, 2, and 3, the intermediate shaft 4 does not move in the direction of the housing 8 axis, and an increase in rotational torque due to the movement of the intermediate shaft 4 is prevented. be able to.

  On the other hand, in the example shown in FIGS. 7A and 7B and FIGS. 8A and 8B, the main body 8a and the lid 7 of the housing 8 are integrally formed of synthetic resin, and the main body of the housing 8 is formed. A shaft support groove 8d into which the tip of the shaft portion 4a of the intermediate shaft 4 is inserted from the opening side to the center portion is provided on the inner peripheral surface of the portion 8a. Protrusions 8f and 8g are provided in the middle of the shaft support groove 8d, and the distal end portion of the shaft portion 4a of the intermediate shaft 4 inserted to the inner end portion of the shaft support groove 8d by snap fitting is connected to the shaft support groove 8d. The protrusions 8f and 8g are sandwiched between the inner end wall 8e. Of these, FIG. 7 shows an example in which a protrusion 8f protruding from the bottom of the shaft support groove 8d is provided, and FIG. 8 shows an example in which protrusions 8g protruding from both side walls of the shaft support groove 8d are provided. In each of these examples, since the intermediate shaft 4 is restricted from moving in the axial direction of the housing 8, an increase in rotational torque can be prevented as in the example of FIG. Further, since the main body portion 8a and the lid portion 7 of the housing 8 are integrally formed, the number of parts can be reduced.

1, 2 Opposing bevel gear 1a Ring gear 1b Engagement part 3 Intermediate bevel gear 4 Intermediate shaft 4a Shaft part 4b Tube part 4c Engagement part 5, 14 First one-way clutch 6, 15 Second one-way clutch 7 Lid Portion 7a Stopper 8 Housing 8a Body 8b, 8d Shaft support grooves 8c, 8e Inner end walls 8f, 8g Projection A Input shaft B Output shaft

Claims (7)

Two opposed bevel gears that are arranged between an external input shaft and an output rotating member that rotate around mutually parallel axes, and that are inserted through the input shaft, and an intermediate bevel gear that meshes with both the opposed bevel gears; A first one-way clutch that transmits forward rotation of the input shaft to one opposing bevel gear; and a second one-way clutch that transmits reverse rotation of the input shaft to the other counter bevel gear, One opposed bevel gear has a rotation transmission means that enables rotation transmission to and from the output rotation member, and converts the forward / reverse bi-directional rotation input from the input shaft into a unidirectional rotation and the output rotation In the one-way rotation transmission device that outputs to the member,
An intermediate shaft having a shaft portion in which the intermediate bevel gear is rotatably fitted and a cylindrical portion that is rotatably fitted on the outer periphery of the input shaft is provided, the intermediate shaft, the intermediate bevel gear, the other opposite bevel gear, Two one-way clutches are incorporated into a cylindrical housing having a lid that opens at one end and passes the input shaft at the other end, and the one counter bevel gear is rotatable on the cylindrical portion of the intermediate shaft. A one-way rotation transmission device characterized by being engaged and prevented from coming off. Two opposed bevel gears disposed between an external input rotating member and an output shaft that rotate around mutually parallel axes, the intermediate bevel gears meshing with the opposed bevel gears; A first one-way clutch that transmits a positive rotation of the one opposed bevel gear to an output shaft, and a second one-way clutch that transmits a positive rotation of the other opposed bevel gear to an output shaft, One counter bevel gear has a rotation transmission means that enables rotation transmission to and from the input rotation member, and the forward and reverse bi-directional rotation input from the input rotation member is converted into one direction rotation and the output In the one-way rotation transmission device that outputs to the shaft,
It said intermediate bevel gear intermediate shaft is provided with and the cylindrical portion to be fitted to the rotatable outer periphery of the shaft portion and the front Kide force shaft to be fitted to rotatably the intermediate bevel gear and the other opposing bevel gear and the intermediate shaft When the second and one-way clutch, one end built into the cylindrical housing with a lid through which pre Kide force axis open other end, said one of the opposing bevel gear cylindrical portion of the intermediate shaft One-way rotation transmission device characterized in that it is rotatably engaged with and prevented from coming off. The one-way rotation transmission device according to claim 1 or 2 , wherein the cylindrical portion of the intermediate shaft and one opposed bevel gear are respectively formed of synthetic resin and engaged by snap fitting. The one-way rotation transmission device according to any one of claims 1 to 3, characterized in that the cover portion of the housing formed by the body part and the separate. The one-way rotation transmission according to any one of claims 1 to 4 , wherein the housing is provided with means for supporting a shaft portion of the intermediate shaft and restricting movement of the intermediate shaft in the housing axial direction. apparatus. The means for restricting the movement of the intermediate shaft is inserted into the inner peripheral surface of the main body formed separately from the lid of the housing from the lid side to the center of the shaft portion of the intermediate shaft. A shaft support groove is provided, and a stopper to be inserted into the shaft support groove is provided on the inner surface of the lid, and the tip of the shaft portion of the intermediate shaft is sandwiched between the stopper and the inner end wall of the shaft support groove. The one-way rotation transmission device according to claim 5 , wherein the one-way rotation transmission device is attached. The means for restricting the movement of the intermediate shaft is a shaft in which the housing is made of synthetic resin, and the distal end portion of the shaft portion of the intermediate shaft is inserted from the opening side to the center portion on the inner peripheral surface of the main body portion of the housing. A support groove is provided, a protrusion is provided in the middle of the shaft support groove, and the tip of the shaft portion of the intermediate shaft is sandwiched between the protrusion and the inner end wall of the shaft support groove. The unidirectional rotation transmission device according to claim 5 .

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