JP2004183784A - Rotating member for power transmission, power transmitting device, rotational driving device, and image forming part driving device for image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively achieve high accuracy in components and assembling without particularly needing the machining of high accuracy, to suppress the variation in rotation. <P>SOLUTION: This device is provided with an input shaft 13 to which the rotation of a motor 1 is input, a reduction gear 2 for decelerating the rotation of the input shaft 14, and an output shaft 24 for outputting the rotation from the reduction gear 2. The reduction gear 2 has a solar roller 20, an internal ring 21 and a planetary roller 22. The planetary roller 22 has a rolling bearing 30 composed of an inner ring 30a, an outer ring 30b and a plurality of rolling elements 30c, and a frictional member 31. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotating member for power transmission, and more particularly to a rotating member for a power transmitting device used in a power transmitting device that transmits and outputs an input rotation of a motor by frictional contact.
In addition, the present invention relates to a power transmission device, and more particularly to a power transmission device that transmits the rotation of an input motor by frictional contact, outputs the rotation, and changes the speed.
[0002]
Further, the present invention relates to a rotary drive device, and more particularly, to a rotary drive device for rotating a photosensitive drum of a copying machine or the like, detecting an output rotation speed, and performing feedback control of the drive rotation speed.
In addition, the present invention relates to an image forming unit driving device of an image forming apparatus using the above-described rotary driving device.
[0003]
[Prior art]
2. Description of the Related Art In an image forming apparatus such as a copying machine, a printing machine, and the like, a rotation driving device for rotating a photosensitive drum or a roller for feeding a film with high precision is required. This type of conventional device includes a motor and a planetary speed reducer that reduces the rotation of the motor. As the planetary reduction gear, there are a gear reduction gear and a traction, that is, a friction transmission reduction gear, each having a solar wheel, an internal ring, a planet wheel, and a carrier.
[0004]
The traction type reduction gear transmission has a configuration in which a sun wheel, an internal ring and a planet wheel are pressed against each other to transmit torque by friction. The solar car, the internal ring, and the planetary car are each mainly made of an iron-based material.
In such a traction type reduction gear transmission, a structure as shown in Japanese Utility Model Publication No. 63-23643 has been conventionally employed as a support structure for a planetary vehicle. Here, a pair of rolling bearings or bushes is mounted on a support shaft supported by the carrier, and the planetary wheels are rotatably supported via the rolling bearings.
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 63-23643
[0006]
[Problems to be solved by the invention]
In the conventional traction-type reduction gear described above, a rolling bearing or the like is used to support a planetary vehicle or the like. Therefore, when such a structure is used for a light-load power transmission device, there is a problem that the structure is complicated and large in size for the load. Further, a structure for supporting a planetary wheel or the like without using a bearing is also adopted, but in this case, a device for solving the problem of lubrication and the problem of processing accuracy is required.
[0007]
Further, in the traction type reduction gear, there is a problem that each friction wheel needs to be processed with high precision, and the processing cost is increased in order to obtain desired precision.
An object of the present invention is to provide a power transmission device having a small and inexpensive configuration.
Another object of the present invention is to suppress fluctuations in rotation so as to obtain high component accuracy without particularly requiring high-precision processing.
[0008]
[Means for Solving the Problems]
The power transmission rotary member according to claim 1 is used in a power transmission device that transmits and outputs the input rotation of the motor by frictional contact, and is a power transmission rotary member supported by a support shaft, and a rolling bearing. And a friction member. A rolling bearing includes an inner race fixed to a support shaft, an outer race arranged coaxially with the inner race and rotatable relative to the inner race, and a plurality of rolling elements arranged between the inner race and the outer race. Further, the friction member is mounted on the outer periphery of the outer race and comes into frictional contact with a member on the side that transmits rotation.
[0009]
Here, the inner race of the rolling bearing is supported by the support shaft, and the outer race makes frictional contact with the member on the side that transmits rotation via the friction member. Therefore, for example, when the power transmission rotary member is used as a planetary wheel of a planetary mechanism, the planetary wheel can be realized only with the conventional bearing itself and the friction member provided on the outer periphery thereof, and the configuration is simplified. In addition, commercially available rolling bearings can be used, and since there is no iron-based material that requires high-precision machining around, the high precision of commercially available rolling bearings can be used as it is, so it is inexpensive. A high-precision rotation transmitting member such as a planetary vehicle can be realized.
[0010]
According to a second aspect of the present invention, there is provided a power transmission rotary member according to the first aspect, wherein the friction member has a friction coefficient of 0.1 or more.
In this case, since the friction coefficient of the friction member is relatively large, the pressing force of the friction transmission portion can be relatively small, and the strength design inside the power transmission device can be easily realized.
According to a third aspect of the present invention, there is provided a power transmitting rotary member according to the first or second rotary member, wherein the friction member is an annular member having elasticity, and an inner diameter of the friction member in a free state is smaller than an outer diameter of the outer ring.
[0011]
In this case, the friction member is attached to the outer ring of the rolling bearing in an extended state, so that the friction member can be prevented from waving and the rotation fluctuation can be further suppressed.
According to a fourth aspect of the present invention, in the power transmission rotary member according to the first or second aspect, the friction member is formed integrally with the outer ring on the outer periphery of the outer ring.
In this case, the friction member is formed integrally by, for example, coating or molding on the outer ring, so that manufacture, assembly, and handling are facilitated.
[0012]
A power transmission device according to claim 5, wherein the speed of the input rotation of the motor is changed and output, wherein the input shaft to which the rotation of the motor is input, a speed change mechanism for shifting the rotation of the input shaft, and a speed change mechanism And an output shaft for outputting rotation from the mechanism. The speed change mechanism is a mechanism having one or more friction transmission units, transmitting the rotation of the input shaft by the friction transmission unit, shifting the output shaft to the output shaft, and outputting the output shaft. Further, the friction transmitting portion has a rolling bearing, a transmitted member, and a friction member. A rolling bearing includes an inner race fixed to a support shaft, an outer race arranged coaxially with the inner race and rotatable relative to the inner race, and a plurality of rolling elements arranged between the inner race and the outer race. The rotation of the outer ring of the rolling bearing is transmitted to the transmitted member. The friction member is provided on at least one contact surface between the rolling bearing and the transmitted member.
[0013]
In this device, rotation from a motor is input to an input shaft, and the input rotation is shifted by a transmission mechanism and output to an output shaft. In the speed change mechanism, rotation is transmitted by a friction transmission unit. More specifically, rotation is transmitted between the outer ring of the rolling bearing and the transmitted member via a friction member.
Here, since the friction transmission portion of the power transmission member is constituted by the rolling bearing and the friction member, a high-precision friction transmission portion can be realized easily and inexpensively, and a power transmission device with less rotation fluctuation can be obtained.
[0014]
According to a sixth aspect of the present invention, in the power transmission device according to the fifth aspect, the friction member is provided on an outer peripheral surface of the rolling bearing.
In this case, attachment of the friction member becomes easy.
According to a seventh aspect of the present invention, in the power transmission device according to the sixth aspect, the friction member is an annular member mounted on an outer peripheral surface of the rolling bearing.
[0015]
In this case, various kinds of friction members can be mounted on the outer peripheral surface of the rolling bearing, and a friction member having an appropriate friction coefficient according to specifications can be easily selected.
The power transmission device according to claim 8 is the device according to claim 7, wherein the friction member is an annular member having elasticity, and an inner diameter of the friction member in a free state is smaller than an outer diameter of the outer ring.
[0016]
Here, similarly to the above, the friction member is attached to the outer ring of the rolling bearing in an extended state, so that the waving phenomenon of the friction member can be suppressed and the rotation fluctuation can be further suppressed.
According to a ninth aspect of the present invention, in the power transmission device according to the fifth aspect, the friction member is provided on a contact surface of the transmitted member.
[0017]
Here, for example, when a friction transmission unit is provided in a planetary mechanism including a plurality of three or more planetary wheels and one internal ring, the internal ring as the transmitted member and the friction member are provided in the sun wheel. Accordingly, the number of parts is reduced as compared with a case where a friction member is provided for each of the plurality of planetary wheels.
According to a tenth aspect of the present invention, in the power transmission device according to the sixth or ninth aspect, the friction member is formed integrally with the outer ring or the transmitted member on a contact surface of the outer ring or the transmitted member.
[0018]
In this case, similarly to the above, the friction member is formed integrally with the outer ring or the transmitted member by, for example, coating, molding, or the like, which facilitates manufacture, assembly, and handling.
In a power transmission device according to an eleventh aspect, in the device according to the fifth aspect, the transmission mechanism includes a sun wheel provided on the input shaft and a carrier fixed to the output shaft. In addition, the rolling bearing is supported by the carrier and makes frictional contact with the sun wheel via the friction member, and the transmitted member cannot rotate, and the inner peripheral surface frictionally contacts the rolling bearing and the friction member. It is a null ring.
[0019]
Here, the speed change mechanism has a planetary mechanism, and a rolling bearing and a friction member are used as the planetary wheels. Also in this case, similarly to the above, a highly accurate planetary mechanism can be realized simply and inexpensively, and an apparatus with less rotation fluctuation can be realized.
According to a twelfth aspect of the present invention, in the power transmission device according to the eleventh aspect, the internal ring has elasticity in a normal direction of rotation and rigidity such that elastic deformation is impossible in a tangential direction due to frictional contact. It is composed of
[0020]
In this case, since the power transmission raceway surface of the internal ring is formed along the contact point with the planetary vehicle, the rotational accuracy of the transmission mechanism depends on the accuracy of the planetary vehicle and the carrier, excluding the internal ring element. Since it is determined, it is convenient in terms of configuration.
In addition, if the internal ring is configured to have an inner diameter smaller than the raceway surface determined by the planetary wheels, it is possible to generate a pressing force for friction transmission by elastic deformation of the internal ring.
[0021]
According to a thirteenth aspect of the present invention, in the power transmission device according to the fifth aspect, the transmission mechanism further includes an input wheel to which rotation of the input shaft is transmitted, and an output wheel to transmit rotation to the output shaft. Has a friction member on the outer peripheral surface, and frictionally transmits rotation between the outer peripheral surface of each of the input wheel and the output wheel via the friction member.
According to a fourteenth aspect of the present invention, in the power transmission device according to the fifth aspect, the speed change mechanism has an input wheel to which rotation of the input shaft is transmitted, and an output having a cylindrical portion on the outer peripheral portion and transmitting rotation to the output shaft. The rolling bearing further has a friction member on the outer peripheral surface, and transmits rotation between the outer peripheral surface of the input vehicle and the inner peripheral surface of the cylindrical portion of the output vehicle via the friction member.
[0022]
A rotation drive device according to claim 15, wherein the rotation drive device is configured to rotationally drive the driven device, detect the output rotation speed, and feedback-control the drive rotation speed, and a motor as a rotation drive source; Item 15. A power transmission device according to any one of Items 5 to 14, a speed detection mechanism for detecting an output rotation speed of the power transmission device, and rotation control means for controlling rotation of the motor based on a detection result of the speed detection mechanism. And
[0023]
In this device, the rotation of a motor is input to a power transmission device, shifted, and output. The output rotation speed of the power transmission device is detected by a speed detection mechanism, and the rotation of the motor is controlled based on the detection result.
Here, since the rotation is transmitted by the power transmission device according to any one of claims 5 to 14, rotation fluctuation can be suppressed, and thus rotation control is facilitated, and desired rotation can be performed with high accuracy. can do.
[0024]
An image forming driving device for an image forming apparatus according to claim 16 is a device for driving a rotator provided in an image forming unit of the image forming apparatus, wherein the rotator is provided corresponding to the image forming unit. And a rotary drive device according to claim 15 connected to the rotary drive device.
Among the image forming apparatuses, for example, a four-tandem tandem type color copier or the like requires a driving device for driving each of the image forming units for four colors. It is desired that a device for driving each image forming unit can control the rotation speed with high precision in order to prevent color unevenness and color shift due to rotation unevenness.
[0025]
Therefore, in the apparatus according to claim 16, the rotary drive device described in claim 15 is used for driving a rotating body such as a photosensitive drum of each image forming unit. Here, as described above, a high-precision rotation speed can be obtained at low manufacturing cost, and a high-quality image can be obtained.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
[First Embodiment]
FIG. 1 shows a rotary drive device according to a first embodiment of the present invention.
The rotation drive device shown in FIG. 1 detects a motor 1, a planetary traction reduction device (power transmission device) 2 that reduces the speed of rotation from the motor 1 and outputs the rotation, and an output rotation speed of the reduction device 2. And a speed detection mechanism 3. Further, the rotation drive device further includes a controller 4 to which an output from the speed detection mechanism 3 is input, and a drive device 5 for controlling the rotation speed of the motor 1 according to a control signal from the controller 4.
[0027]
The motor 1 includes a cup-shaped rotor hub 10, a rotor magnet 11 fixed to the inner wall of the rotor hub 10, a bracket 12 disposed at the center, a coil 13 disposed between the rotor magnet 11 and the bracket 12, And a rotating shaft 14. The bracket 12 includes a cylindrical bearing holder 15 and a motor flange 16 formed to extend radially outward at an output end (left end in FIG. 1) of the bearing holder 15. Have. The rotating shaft 14 is rotatably supported on the inner peripheral portion of the bearing holder 15 via a pair of bearings 17 and 18 such as ball bearings. In addition, the tip of the rotating shaft 14 enters the reduction gear 2 and forms a sun roller 20 which is an input part of the reduction gear 2. The outer ring of the bearing 17 on the side of the reduction gear 2 is provided with a spring 19 for applying a preload to the bearings 17 and 18.
[0028]
The speed reduction device 2 reduces the rotation speed of the motor 1 rotating at a high speed to a desired rotation speed, for example, 1 rotation / second, and includes a sun roller 20, an internal ring 21, a plurality of ( (Three in the present embodiment, but only two appear in the figure), a carrier 23 that supports a plurality of planetary rollers 22, and an output shaft 24. The sun roller 20, the internal ring 21, the plurality of planetary rollers 22, and the carrier 23 are housed in a housing 25. A hole through which the output shaft 24 penetrates is formed on the end face of the housing 25 opposite to the motor, and the output shaft 24 is rotatably supported by the housing 25 via a pair of bearings 26 and 27. The internal ring 21 is formed integrally with the housing 25 on a part of the housing 25.
[0029]
The planetary roller 22 is rotatably supported in a cantilever manner with respect to the carrier 23 by a rod 28, and frictionally contacts the rolling bearing 30, the sun roller 20, and the internal ring 21 as shown in an enlarged view in FIG. And a friction member 31 to be used.
The rolling bearing 30 used in the present embodiment is a commercially available shield-type (grease-filled) ball bearing, and is disposed coaxially with the inner ring 30a pressed into the rod 28 and on the outer periphery of the inner ring 30a. It has an outer race 30b and a plurality of rolling elements 30c arranged between the inner race 30a and the outer race 30b. Seals are provided on both sides to prevent the grease filled between the inner race 30a and the outer race 30b from leaking.
[0030]
The friction member 31 is an elastic member formed in a ring shape by BR, NBR, SBR, urethane rubber, thermoplastic elastomer, or the like, and is mounted over the outer periphery of the outer ring 30b of the rolling bearing 30 over a predetermined width. The coefficient of friction with respect to the sun roller 20 and the internal ring 21 is set to be 0.1 or more. Further, the inner diameter of the friction member 31 in the free state (non-mounted state) is formed smaller than the outer diameter of the outer ring 30 b of the rolling bearing 30. Therefore, when the friction member 31 is mounted on the outer periphery of the outer ring 30b, the friction member 31 is mounted in an extended state, whereby the waving phenomenon of the friction member 31 can be suppressed. The friction member 31 can be fixed to the outer periphery of the outer ring 30b without using an adhesive, but may be fixed firmly using an adhesive. Further, the friction member 31 may not be mounted as a separate member, but may be coated on the outer periphery of the outer ring 30b or may be integrally formed by resin molding.
[0031]
The carrier 23 is a ring-shaped member, and the output shaft 24 is inserted into a hole at the center and fixed to each other so as not to rotate relative to each other. Note that the carrier 23 and the output shaft 24 can be formed integrally.
The speed detecting mechanism 3 is disclosed in detail in Japanese Patent Application Laid-Open No. 2002-078290, which is an application of the present applicant. And a vessel 36. With such a configuration, the rotation speed of the carrier 23, that is, the output shaft 24 is detected, and the detection result is sent to the controller 4.
[0032]
The controller 4 is a control circuit configured by a CPU or the like that can output a motor drive signal, and outputs a motor drive signal based on the detection output from the photodetector 36 so that the output rotation speed becomes a desired set value. Circuit. The driver device 5 is a device for driving the motor 1 based on a motor drive signal from the controller 4.
[0033]
Next, the operation will be described.
When the rotation shaft 14 rotates by driving the motor 1, the rotation is input to the reduction gear 2. This rotation is reduced by a reduction ratio determined by the outer diameter and inner diameter of each of the sun roller 20, the planetary roller 22, and the internal ring 21, and is output via the carrier 23 and the output shaft 24.
[0034]
At this time, the rotation speed of the carrier 23 is detected as a pulse signal by the pulse disk 35 and the photodetector 36 fixed to the side surface of the carrier 23, and the pulse signal is input to the controller 4. The controller 4 detects a phase difference between the rotation speed detection pulse obtained by the photodetector 36 and the reference pulse, and inputs a motor drive signal to the drive device 5 to eliminate the phase difference. Then, the rotation speed of the motor 1 is increased or decreased by a drive signal from the drive device 5.
[0035]
By such feedback control, the rotation speed of the motor 1 is controlled so that the output rotation speed of the reduction gear 2 becomes a desired set speed.
In this device, the planetary roller 22 is composed of a rolling bearing 30 and a friction member 31. The rolling bearing 30 is of a grease-filled type. Therefore, the traction oil required in the conventional device becomes unnecessary. Since no traction oil is required, high-precision processing of the seal surface of the seal member and the mating member with which the seal member slides is unnecessary. Further, since the rolling bearing 30 is formed with high precision, it is possible to easily obtain extremely high processing precision and assembling precision, and it is possible to use a versatile commercially available product, so that it is inexpensive and highly accurate. A mechanism with little fluctuation can be realized at low cost. Also, higher strength can be ensured as compared with the case where the planetary rollers are formed of resin or the like.
[0036]
[Modification of First Embodiment]
(A) In the first embodiment, the friction member 31 is attached to the outer ring 30b of the rolling bearing 30. However, the friction member 31 is attached to the outer friction surface of the sun roller 20 and the inner friction surface of the internal ring 21. The planetary roller 22 may be provided only by the rolling bearing 30.
[0037]
(B) In the first embodiment, the internal ring 21 is formed integrally with the housing 25. However, the internal ring 21 may be formed as a separate member from the housing 25. An example of this case is shown in FIGS. FIG. 3 is a front view when the internal ring 40 (or 40 ′) is incorporated, and FIG. 4 is a diagram illustrating the internal rings 40 and 40 ′ alone.
[0038]
As shown in FIG. 4A, the internal ring 40 used in this example has an annular main body 40a and a plurality of mounting legs 40b formed to extend in the axial direction from the main body 40a. (FIG. 4 illustrates four attachment legs). The mounting legs 40b are formed at equal intervals in the circumferential direction, and the distal ends thereof are fixed to the housing 25. In addition, as another example of the internal ring, a shape as shown in FIG. In the internal ring 40 'shown in FIG. 4 (b), the mounting legs 40b' are formed so as to extend along both sides of the annular main body 40a 'in the axial direction. Are fixed to the housing 25, respectively. Therefore, the internal rings 40 and 40 ′ cannot rotate relative to the housing 25.
[0039]
In the above-described configuration, the internal rings 40 and 40 'are made of a member such as spring steel having elasticity in the normal direction of rotation and rigidity that cannot be elastically deformed by frictional contact in the tangential direction. I have.
[Second embodiment]
FIG. 5 shows a second embodiment of the present invention.
[0040]
The device of this embodiment is a so-called parent-child circumscribed reduction device, and includes a motor 1, a reduction device 50, a speed detection mechanism 3 for detecting an output rotation speed of the reduction device 50, a controller 4, and a drive. Device 5. The configurations of the motor 1, the speed detection mechanism 3, the controller 4, and the drive device 5 are the same as those in the first embodiment.
[0041]
The reduction gear 50 is a mechanism for reducing the rotation of the motor 1 and outputting the rotation. The reduction gear 50 includes a cylindrical housing 51, and an output shaft 54 rotatably supported by a pair of bearings 52 and 53 at the center of the housing 51. , An output wheel 55 fixed to the output shaft 54, and an intermediate wheel 56.
The motor 1 is fixed to a side surface of the housing 51, and its rotating shaft 14 extends inside the reduction gear 50. The output wheel 55 is a disk-shaped member having a boss 55a at the center and a cylindrical portion 55b formed at the outer periphery. The boss 55a is fixed to the output shaft 54, and the cylindrical portion 55b is arranged to face the rotating shaft 14 of the motor 1.
[0042]
The intermediate wheel 56 is disposed between the rotating shaft 14 and the outer peripheral surface of the cylindrical portion 55b of the output wheel 55, and is supported by a support rod 57 supported by the housing 51. The structure of the intermediate wheel 56 is exactly the same as the structure of the planetary roller 22 of the first embodiment. And a member 31. The friction member 31 is in frictional contact with the outer peripheral surface of the rotating shaft 14 and the outer peripheral surface of the cylindrical portion 55b of the output wheel 55.
[0043]
In the device having such a configuration, the rotation of the motor 1 is transmitted to the output wheel 55 via the rotary shaft 14 and the intermediate wheel 56, and further transmitted to the output shaft 54. The rotation speed of the output vehicle (output shaft) 55 is detected by the speed detection mechanism 3, and the rotation speed is feedback-controlled by the controller 4 and the drive device 5 as in the first embodiment. Here, since the intermediate wheel 56 is formed of a rolling bearing, fluctuations in the rotation speed can be suppressed, and the rotation speed of the output shaft 54 can be controlled to a desired rotation speed with high accuracy.
[0044]
Also in this embodiment, the intermediate wheel 56 may be constituted only by rolling bearings, and friction members may be provided on the outer peripheral surface of the rotating shaft 14 and the outer peripheral surface of the cylindrical portion 55b of the output wheel 55.
[Third embodiment]
FIG. 6 shows a third embodiment of the present invention.
[0045]
The device of this embodiment is a so-called parent-child type inscribed reduction device, and includes a motor 1, a reduction device 60, a speed detection mechanism 3 for detecting an output rotation speed of the reduction device 60, a controller 4, And a drive device 5. The configurations of the motor 1, the speed detection mechanism 3, the controller 4, and the drive device 5 are the same as those in the first embodiment.
[0046]
The speed reducer 60 is a mechanism for reducing the speed of rotation of the motor 1 and outputting the reduced speed. The speed reducer 60 includes a cylindrical housing 61, and an output shaft 64 rotatably supported by a pair of bearings 62 and 63 at the center of the housing 61. , An output wheel 65 fixed to the output shaft 64, and an intermediate wheel 66.
The motor 1 is fixed to a side surface of the housing 61, and its rotating shaft 14 extends inside the speed reducer 60. The output wheel 65 is a disk-shaped member having a boss 65a at the center and a cylindrical portion 65b at the outer periphery. The boss 65a is fixed to the output shaft 64, and the rotary shaft 14 of the motor 1 is disposed inside the cylindrical portion 65b.
[0047]
The intermediate wheel 66 is disposed between the rotating shaft 14 and the inner peripheral surface of the cylindrical portion 65b of the output wheel 65, and is supported by a support rod 67 supported by the housing 61. The structure of the intermediate wheel 66 is exactly the same as the structure of the planetary roller 22 of the first embodiment. And a member 31. The friction member 31 is in frictional contact with the outer peripheral surface of the rotating shaft 14 and the inner peripheral surface of the cylindrical portion 65b of the output wheel 65.
[0048]
In the device having such a configuration, the rotation of the motor 1 is transmitted to the output wheel 65 via the rotating shaft 14 and the intermediate wheel 66, and further transmitted to the output shaft 64. The rotation speed of the output vehicle (output shaft) 65 is detected by the speed detection mechanism 3, and the rotation speed is feedback-controlled by the controller 4 and the drive device 5, as in the first embodiment. Here, since the intermediate wheel 66 is formed of a rolling bearing, fluctuations in the rotation speed can be suppressed, and the rotation speed of the output shaft 64 can be controlled to a desired rotation speed with high accuracy.
[0049]
Also in this embodiment, the intermediate wheel 66 may be constituted only by rolling bearings, and friction members may be provided on the outer peripheral surface of the rotary shaft 14 and the inner peripheral surface of the cylindrical portion 65b of the output wheel 65.
[Image forming apparatus]
FIG. 7 shows a schematic configuration of an image forming apparatus in which the rotary drive device according to each of the embodiments is employed. The image forming apparatus 100 is a so-called four-tandem type full-color image forming apparatus that multi-transfers a recording sheet to an unfixed visible image of four colors and then fixes the recording sheet, and is arranged along a sheet conveyance path. It has image forming units 102A to 102D for each color (B, C, M, Y). The image forming units 102A to 102D include photoconductor drums 104A to 104D as image carriers, developing units 105A to 105D, blades, charging devices, optical devices, and the like, respectively. A transfer belt 103 is disposed below the image forming units 102A to 102D. The transfer belt 103 is a device for conveying a transfer sheet to a transfer position of a toner image by each of the photosensitive drums 104A to 104D. The upper portion of the transfer belt 103 is in contact with the lower surface of each of the photosensitive drums 104A to 104D. As another embodiment of the image forming apparatus, there is an apparatus in which each color image once synthesized on the transfer belt is finally transferred to a recording sheet.
[0050]
In the image forming apparatus 100 as described above, the above-described rotary driving device is used for driving each of the photosensitive drums 104A to 104D. By employing the above-described rotation driving device in such an image forming apparatus 100, the rotation of the photosensitive drums 104A to 104D can be controlled with high precision at low manufacturing cost, and a high-quality image can be obtained. .
[0051]
【The invention's effect】
As described above, in the present invention, at least one of the friction wheels in the traction-type speed reduction device is configured using the rolling bearing, so that an inexpensive and high-precision friction wheel can be realized. When such a friction wheel is used as a power transmission device or a rotary drive device, a device that can be easily controlled in rotation with little rotation fluctuation by inexpensive means can be realized.
[Brief description of the drawings]
FIG. 1 is a sectional configuration diagram of a rotary drive device according to a first embodiment of the present invention.
FIG. 2 is an enlarged partial view of FIG. 1;
FIG. 3 is a partial cross-sectional configuration diagram showing a modification of the first embodiment.
FIG. 4 is a perspective view of an internal ring according to the modification.
FIG. 5 is a sectional configuration diagram of a rotary drive device according to a second embodiment of the present invention.
FIG. 6 is a sectional configuration diagram of a rotary drive device according to a third embodiment of the present invention.
FIG. 7 is a schematic configuration diagram of an image forming apparatus employing the rotation drive device.
[Explanation of symbols]
1 ---- Motor
2,50,60 --- reduction gear
3 ---- speed detection mechanism
4 ---- Controller
5 ---- Drive device
20 ---- Sun Roller
21 --- internal ring
22 --- Planetary roller
23 --- Carrier
24 --- Output shaft
30 --- Rolling bearing
31 --- friction member
55, 65 --- output vehicle
56,66 --- Intermediate wheel
100 --- Image Forming Apparatus

Claims (16)

A power transmission rotating member used for a power transmission device that transmits and outputs the input rotation of the motor by frictional contact and is supported by a support shaft,
An inner ring fixed to the support shaft, an outer ring arranged coaxially with the inner ring on the outer periphery of the inner ring so as to be relatively rotatable, and a plurality of rolling elements disposed between the inner ring and the outer ring. Bearings,
A friction member mounted on the outer circumference of the outer ring and frictionally contacting a member on the side that transmits rotation,
A power transmission rotary member comprising: The rotating member for power transmission according to claim 1, wherein the friction member has a friction coefficient of 0.1 or more. The friction member is an annular member having elasticity,
The inner diameter of the friction member in a free state is smaller than the outer diameter of the outer ring,
The power transmission rotating member according to claim 1. The power transmission rotating member according to claim 1, wherein the friction member is formed integrally with the outer ring on an outer periphery of the outer ring. A power transmission device that shifts and outputs the rotation of an input motor,
An input shaft to which the rotation of the motor is input,
A transmission mechanism that changes the rotation of the input shaft;
An output shaft that outputs rotation from the transmission mechanism,
The speed change mechanism is a mechanism having one or more friction transmission units, transmitting the rotation of the input shaft by the friction transmission unit, shifting the output shaft to the output shaft, and outputting the output shaft,
The friction transmission unit,
A rolling bearing comprising: an inner ring fixed to a support shaft; an outer ring disposed coaxially with the inner ring on the outer periphery of the inner ring so as to be relatively rotatable; and a plurality of rolling elements disposed between the inner ring and the outer ring. When,
A transmitted member to which the rotation of the outer ring of the rolling bearing is transmitted,
Having a friction member provided on at least one contact surface of the rolling bearing and the transmitted member,
Power transmission device. The power transmission device according to claim 5, wherein the friction member is provided on an outer peripheral surface of the rolling bearing. The power transmission device according to claim 6, wherein the friction member is an annular member mounted on an outer peripheral surface of the rolling bearing. The friction member is an annular member having elasticity,
The inner diameter of the friction member in a free state is smaller than the outer diameter of the outer ring,
The power transmission device according to claim 7. The power transmission device according to claim 5, wherein the friction member is provided on a contact surface of the transmitted member. The power transmission device according to claim 6, wherein the friction member is formed integrally with the outer ring or the transmitted member on a contact surface of the outer ring or the transmitted member. The transmission mechanism has a sun wheel provided on the input shaft, and a carrier fixed to the output shaft,
The rolling bearing is supported by the carrier and frictionally contacts the sun wheel via the friction member,
The transmitted member is an internal ring that cannot rotate and has an inner peripheral surface in friction contact with the rolling bearing via the friction member.
The power transmission device according to claim 5. The power transmission device according to claim 11, wherein the internal ring is formed of a member having elasticity in a normal direction of rotation and having a rigidity that cannot be elastically deformed by the frictional contact in a tangential direction. . The transmission mechanism further includes an input wheel to which rotation of the input shaft is transmitted, and an output wheel to transmit rotation to the output shaft,
The rolling bearing has the friction member on an outer peripheral surface, and frictionally transmits rotation between the outer peripheral surfaces of the input wheel and the output wheel via the friction member.
The power transmission device according to claim 5. The transmission mechanism further includes an input wheel to which rotation of the input shaft is transmitted, and an output wheel having a cylindrical portion on an outer periphery and transmitting rotation to the output shaft,
The rolling bearing has the friction member on the outer peripheral surface, and transmits rotation between the outer peripheral surface of the input wheel and the inner peripheral surface of the cylindrical portion of the output wheel via the friction member,
The power transmission device according to claim 5. A rotary drive device for rotationally driving the driven device, detecting the output rotational speed and performing feedback control of the drive rotational speed,
A motor as a rotary drive source,
A power transmission device according to any one of claims 5 to 14,
A speed detection mechanism for detecting an output rotation speed of the power transmission device,
Rotation control means for performing rotation control of the motor based on a detection result of the speed detection mechanism,
A rotary drive device comprising: An apparatus for driving a rotating body provided in an image forming unit of the image forming apparatus,
An image forming unit driving device for an image forming apparatus, comprising: the rotation driving device according to claim 15, provided corresponding to the image forming unit and connected to the rotating body.

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