JP2008267520A - Wear preventing member, rotating mechanism, drive mechanism, and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the wear and abnormal sounds of a sliding bearing in which a power transmission member fixing irregular-shaped portion formed on a rotating shaft is arranged. <P>SOLUTION: This wear preventing member 310 is arranged between the rotating shaft 301 having a plane portion 304 formed on the outer peripheral face ranging from the joining site of a gear 302 to at least one edge for joining the gear 302, and a sliding bearing 303 rotationally supporting the rotating shaft 301 at its end. It comprises an insertion part 311 to be inserted into a gap portion formed between the plane portion 304 of the rotating shaft 301 and the inner peripheral face of the sliding bearing 303, and a collar member 312 arranged outside the sliding bearing for the shaft member to be inserted thereinto. It is rotated together with the rotating shaft 301. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wear prevention device, a rotation mechanism, a drive device, and an image forming apparatus. In particular, a deformed portion for coupling a rotation transmission member to a peripheral surface is formed from a coupling portion of the rotation transmission member to at least one edge portion. The present invention relates to a wear preventing member used for a slide bearing that rotatably supports an end of a rotating shaft, a rotating mechanism using the same, a driving device, and an image forming apparatus.

  In a rotation mechanism in which a rotation shaft and a gear rotate together, the rotation shaft and the gear are connected by a joint. As this joint, a projecting portion is provided on the rotating shaft with a separate member such as a pin to fix the gear, or a plane formed by cutting a part of the rotating shaft is provided, and this plane is combined with a plane portion formed inside the gear. Some things are fixed. The former has a large degree of freedom in the shape of the pin and can transmit a large torque, and there are few processed parts of the rotating shaft, but the cost becomes high because the pin becomes a separate member. The latter has a limited transmission torque because the area of the flat portion is limited by the shaft diameter, but is inexpensive.

  As described above, the shape of the drive transmission portion of the rotating shaft is properly used depending on the purpose of use. However, when a general-purpose component is adopted as a gear, the shape of the rotating shaft needs to be matched to an existing gear mounting method. In particular, the latter is often employed in electromagnetic clutches and the like.

  In such a rotating mechanism, a bearing that supports the rotating shaft is used. When the bearing to be used is a rolling bearing such as a ball bearing, the rotating shaft and the inner ring of the bearing are integrated into the bearing. Since the rolling element is rotated, a highly accurate rotation can be obtained with low friction regardless of the shape of the rotating shaft. However, since the cost of the rolling bearing increases, when the accuracy is not required or when the shaft load is small, the cost is reduced by using a sliding bearing that slides the rotating shaft and the bearing inner ring.

  12 is a perspective view showing a conventional rotating mechanism, and FIG. 13 is an exploded perspective view of the rotating mechanism shown in FIG. The rotating mechanism 200 is fixed so that the rotating shaft 201 and the gear 202 rotate together, and both ends of the rotating shaft 201 are rotatably supported by slide bearings 203. A flat portion 204 is formed by cutting the bearing 203, and the flat portion 204 comes into contact with a gear-side flat portion 207 formed on the hub 206 of the gear 202 to fix the gear 202 to the bearing 203. Here, the plane portion 204 is formed up to the end of the rotating shaft 201 in order to insert the gear 202 into the rotating shaft 201.

  In this state, when a driving force is transmitted from a driving source (not shown) via the gear 202, the gear 202 and the rotating shaft 201 rotate together around the bearing 203. At this time, since the bearing receives a load from the rotating shaft, the material of the bearing has a low frictional resistance and a high slidability so that the rotating shaft can easily rotate. However, as shown in FIG. 14, the rotary shaft 201 is formed with a flat surface portion 204 and has a substantially D-shaped cross section, so that the edge portion 208 of the edge contacts the inner peripheral surface of the bearing 203 for a long time. When sliding, the edge wears the inner diameter of the bearing, the surface becomes rough, and abnormal noise may occur during sliding.

  There are the following techniques for extending the life of a bearing in an apparatus using a slide bearing. In Patent Document 1, a pressing plate and a movable clutch member for sliding an axially slidable movable clutch member adjacent to the fixed clutch member in a direction to engage with the fixed clutch member. With a thrust bearing interposed between the required outer peripheral surface of the output shaft through which the thrust bearing is inserted and the inner peripheral surface of the thrust bearing. Are listed.

In Patent Document 2, a fixed cored bar, a magnet roller fixed to the cored bar, a flange rotatably supported by the cored bar, and the inner peripheral surface of the end spigot part are fitted to the outer peripheral surface of the flange. In the developing roller provided with a nonmagnetic sleeve that rotates in the outer diameter direction of the magnet roller by being fixed, an R-shaped portion is provided on the insertion side end face of the flange.
JP-A-11-242392 Japanese Patent Laid-Open No. 10-299790

  However, in order to deal with the above-mentioned problems, it is possible to perform additional processing such as chamfering on the edge of the processed surface end, but performing additional processing on the rotating shaft not only increases the cost, but also increases the area of the flat surface portion. This is not realistic because the torque that can be transmitted decreases.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a wear preventing member that can prevent wear and noise of a slide bearing in which a deformed portion for fixing a power transmission member formed on a rotating shaft is disposed.

  According to the first aspect of the present invention, there is provided a rotating shaft having a deformed portion for coupling the rotation transmitting member to the outer peripheral surface formed from the coupling portion of the rotation transmitting member to at least one edge portion, and the end of the rotating shaft is rotatably supported. A wear preventing member disposed between the sliding bearing and an insertion portion inserted into a gap formed between the deformed portion of the rotating shaft and an inner peripheral surface of the sliding bearing, and the sliding It is a wear preventing member characterized by comprising a collar member that is arranged outside the bearing and into which the shaft member is inserted, and that rotates together with the rotating shaft.

  According to a second aspect of the present invention, in the wear preventing member according to the first aspect, the insertion portion is formed smaller than a gap formed by the deformed portion of the rotating shaft and the slide bearing.

  According to a third aspect of the present invention, in the wear preventing member according to the first aspect, the contour shape of the insertion portion on the side in contact with the plain bearing has an arc shape with a radius larger than the radius of the rotating shaft.

  According to a fourth aspect of the present invention, in the wear preventing member according to the first aspect, the wear preventing member includes a retaining portion that is fitted to the rotating shaft and restricts movement of the rotating shaft in the axial direction.

  According to a fifth aspect of the present invention, in the wear preventing member according to the first aspect, the power transmission member is integrally formed.

  A sixth aspect of the present invention is the wear preventing member according to any one of the first to fifth aspects, wherein the insertion portion is formed of the same material as the rotating shaft.

  According to a seventh aspect of the present invention, in the wear preventing member according to any one of the first to fifth aspects, the insertion portion is formed of a material having a higher slidability than the rotating shaft.

  According to an eighth aspect of the present invention, in the wear preventing member according to any one of the first to fifth aspects, the insertion portion is made of an oil-impregnated material.

  A ninth aspect of the present invention is the wear preventing member according to any one of the first to eighth aspects, wherein a taper portion is formed at a distal end in the longitudinal direction of the insertion portion.

  According to a tenth aspect of the present invention, in the wear preventing member according to any one of the first to ninth aspects, the deformed portion of the rotating shaft is configured as a flat portion.

  The invention according to claim 11 is the wear preventing member according to any one of claims 1 to 10, wherein the power transmission member is a gear.

  According to a twelfth aspect of the present invention, in the wear preventing member according to any one of the first to tenth aspects, the power transmission member is a timing pulley.

  A thirteenth aspect of the invention is a rotating mechanism comprising the wear preventing member according to any one of the first to twelfth aspects.

  A fourteenth aspect of the invention is a rotary mechanism comprising the rotary mechanism according to the fourteenth aspect, wherein the rotary shaft is provided with a swingable universal joint at the tip.

  A fifteenth aspect of the invention is a drive device comprising the rotating mechanism according to the thirteenth or fourteenth aspect.

  A sixteenth aspect of the present invention is a drive device comprising at least two rotational drive transmission mechanisms according to the thirteenth or fourteenth aspect.

  A seventeenth aspect of the invention is an image forming apparatus comprising the driving device according to the fifteenth or sixteenth aspect.

  According to the present invention, since the wear preventing member is provided between the rotary shaft and the slide bearing, wear inside the slide bearing due to the edge of the flat portion of the rotary shaft can be prevented, and abnormal noise can be prevented.

  Embodiments as the best mode for carrying out the present invention will be described below with reference to the drawings.

  Hereinafter, a color laser printer (hereinafter simply referred to as “printer”) will be described as an image forming apparatus to which the rotation mechanism according to the embodiment is applied. In this example, the rotation mechanism according to the present invention is used as the rotation mechanism of the printer.

  In FIG. 1, this printer forms a tandem image forming unit by arranging four image forming units of yellow (Y), cyan (C), magenta (M), and black (K) side by side. In the tandem image forming unit, image forming units 101Y, 101C, 101M, and 101K as individual toner image forming units are arranged in order from the left in the drawing.

  Here, the subscripts Y, C, M, and K of the respective symbols indicate members for yellow, magenta, cyan, and black, respectively. In the tandem image forming unit, the image forming units 101Y, 101C, 101M, and 101K are arranged around the drum-shaped photosensitive drums 21Y, 21C, 21M, and 21K serving as latent image carriers, and charging devices and developing devices. 10Y, 10C, 10M, 10K, a photoconductor cleaning device, and the like.

  At the top of the printer, toner bottles 2Y, 2C, 2M, and 2K filled with yellow, cyan, magenta, and black color toners are arranged. Each color toner is replenished from the toner bottles 2Y, 2C, 2M, and 2K to the developing devices 10Y, 10C, 10M, and 10K of the respective colors by a predetermined replenishment amount through a conveyance path (not shown).

  An optical writing unit 9 as a latent image forming unit is disposed below the tandem image forming unit. The optical writing unit 9 includes a light source, a polygon mirror, an f-θ lens, a reflection mirror, and the like, and irradiates the surface of each of the photosensitive drums 21Y, 21C, 21M, and 21K while scanning the laser beam based on the image data. Is configured to do.

  Further, an endless belt-like intermediate transfer belt 1 is disposed as an intermediate transfer member immediately above the tandem image forming unit. The intermediate transfer belt 1 is wound around a drive roller 1a and a support roller 1b, and a drive motor (not shown) serving as a drive source is connected to a rotation shaft of the drive roller 1a. When this drive motor is driven, the intermediate transfer belt 1 rotates counterclockwise in the figure, and the followable support roller 1b rotates. Inside the intermediate transfer belt 10, primary transfer devices 11Y, 11C, 11M, and 11K for transferring the toner images formed on the photosensitive drums 21Y, 21C, 21M, and 21K onto the intermediate transfer belt 1 are disposed. Has been.

  Further, a secondary transfer roller 4 as a secondary transfer device is disposed downstream of the primary transfer devices 11Y, 11C, 11M, and 11K in the driving direction of the intermediate transfer belt 1. A support roller 1b is disposed on the opposite side between the secondary transfer roller 4 and the intermediate transfer belt 1 and functions as a pressing member. The intermediate transfer belt 1 is provided with an intermediate transfer body cleaning device 12 that collects residual toner from the intermediate transfer belt 1.

  In the printer according to this example, a paper feed cassette 8, a paper feed roller 7, a registration roller 6 and the like are disposed as a paper feed device. Further, a fixing device 5 for fixing the image on the printing paper and a paper discharge roller 3 are arranged downstream of the secondary transfer roller 4 with respect to the traveling direction of the printing paper on which the toner image is transferred by the secondary transfer roller 4. ing.

  Next, the operation of the printer will be described. The photosensitive drums 21Y, 21C, 21M, and 21K are rotated by the individual image forming units, and the photosensitive drums 21Y, 21C, 21M, and 21K are first rotated by the charging devices 17Y, 17C, 17M, and 17K. , 21C, 21M, and 21K are uniformly charged. Next, image data is irradiated with writing light from a laser from the optical writing unit 9 to form electrostatic latent images on the photosensitive drums 21Y, 21C, 21M, and 21B. Thereafter, toner is attached by the developing devices 10Y, 10C, 10M, and 10K, and the electrostatic latent images are visualized to form yellow, cyan, magenta, and black on the photosensitive drums 21Y, 21C, 21M, and 21K, respectively. The monochrome image is formed. Further, the drive roller 1a is driven to rotate by a drive motor (not shown), the other support roller, the secondary transfer roller 4 are driven to rotate, the intermediate transfer belt 1 is rotated and conveyed, and the visible image is transferred to the primary transfer device. The images are sequentially transferred onto the intermediate transfer belt 1 by 11Y, 11C, 11M, and 11K. As a result, a composite color image is formed on the intermediate transfer belt 1. The surface of the photoconductive drums 21Y, 21C, 21M, and 21K after image transfer is cleaned by removing residual toner with a photoconductor cleaning device to prepare for image formation again.

  In accordance with the timing of image formation, the leading edge of the printing paper is fed from the paper feed cassette 8 by the paper feed roller 7 and conveyed to the registration roller 6 and temporarily stops. Then, the sheet is conveyed between the secondary transfer roller 4 and the intermediate transfer belt 1 while taking timing with the image forming operation. Here, the intermediate transfer belt 1 and the secondary transfer roller 4 form a so-called secondary transfer nip across the printing paper, and the secondary transfer roller 4 transfers the toner image on the intermediate transfer belt 10 onto the printing paper. Next transfer.

  The printing paper after the image transfer is sent to the fixing device 5, where the fixing device 5 applies heat and pressure to fix the transferred image, and is discharged outside the apparatus. On the other hand, the intermediate transfer belt 1 after the image transfer is removed by the intermediate transfer body cleaning device 12 to remove residual toner remaining on the intermediate transfer belt 1 after the image transfer, so that the tandem image forming unit prepares for another image formation.

  Next, a rotation mechanism used for the various rotation drive units of the printer described above will be described. 2A and 2B show a rotating mechanism according to the first embodiment, in which FIG. 2A is a perspective view of the rotating mechanism, FIG. 2B is an enlarged perspective view from a direction different from FIG. FIG. 3 is a perspective view showing a wear preventing member used in the rotating mechanism shown in FIG. As in the rotation mechanism 200 shown in the conventional example, the rotation mechanism 300 has a gear 302 attached to a rotation shaft 301, and slide bearings 303 are arranged at both ends of the rotation shaft 301. As shown in FIG. 2C, the rotating shaft 301 is formed with a flat portion 304 as a deformed portion for attaching the gear 202 to one end portion of the rotating shaft 301, and the rotating shaft 301 comes out of the bearing 303. Grooves 307 and 308 are formed to which the retaining members for preventing the above are locked.

  In the rotation mechanism 300 according to this example, the wear prevention member 310 is inserted between the rotation shaft 301 and the slide bearing 303. As shown in FIG. 3, the wear preventing member 310 includes an insertion portion 311 inserted between the inner peripheral surface of the bearing 303 and the flat portion 304 of the rotating shaft 301, and the insertion portion 311 is erected. The flange member 312 is in contact with the outer surface of the bearing 303. The insertion portion 311 has a crescent-shaped cross section. Further, the shaft member 312 is formed with a shaft through hole 313 similar to the cross-sectional shape of the rotating shaft 301, and the rotating shaft 301 is penetrated therethrough. For this reason, the wear preventing member 310 rotates together with the rotating shaft 301.

  According to the rotation mechanism 300 according to this example, the insertion portion 311 of the wear preventing member 310 fills the gap between the inner periphery of the bearing 303 and the flat portion 304 of the rotation shaft 301, and rotates together with the rotation shaft 301. It is possible to prevent the edge of the flat portion 304 of the shaft 301 from coming into contact with the inner periphery of the slide bearing 303, and to prevent wear and abnormal noise inside the bearing. In addition, if the length of the insertion portion 311 of the wear preventing member 310 is at least the thickness of the slide bearing 303, wear can be reliably prevented. Further, as shown in FIG. 4, the insertion portion 311 of the wear preventing member 310 is configured such that the radius R of the wear preventing member is larger than the radius r of the rotating shaft as shown in FIG. Contact can be prevented.

  In this example, the wear preventing member 310 is made of the same material as the rotating shaft 301. If the wear preventing member 310 is made of the same material as that of the rotating shaft 301, the friction coefficient does not fluctuate due to the rotation of the rotating shaft. If the material of the wear preventing member is made to be more slidable than a metal shaft such as polyacetal, it can be a bearing wear preventing member that does not increase the rotational load. Furthermore, by using an oil-impregnated material for the wear preventing member, it is possible to provide a bearing wear preventing member that enhances lubrication inside the bearing by rotation of the rotating shaft and enhances slidability.

  Furthermore, the shape of the deformed portion of the rotating shaft may be a cross-sectional oval shape provided in two locations facing the flat portion, a polygonal shape provided with a plurality of flat portions, or a curved surface having a diameter different from the shaft diameter, etc. The shape of the wear preventing member may be changed in accordance with the shape of the rotating shaft so as to close the gap between the rotating shaft and the bearing. In addition, when the power transmission member is a timing pulley for attaching a timing belt, not only the driving load but also the tension load for securing the winding amount is applied to the bearing due to the tension of the belt. By attaching the wear prevention member, abnormal wear can be prevented. It is also effective when an electromagnetic clutch or the like is used as the power transmission member.

  Next, a second embodiment will be described. FIG. 5 is a perspective view showing a wear preventing member according to the second embodiment. In the rotation mechanism according to this example, the wear prevention member 320 can obtain the same effect as the wear prevention member 310 of the first example if it prevents the contact of the upstream edge in the rotation direction. As shown in FIG. 4, the wear prevention member 320 is formed on the upstream half of the insertion portion 311 of the wear prevention member 310 by the gap between the rotary shaft and the bearing when the insertion portion 321 is formed in the flange member 322. A corresponding insertion portion 321 is arranged. According to this example, it is possible to prevent wear due to the shaft edge while reducing the cost of the material forming the wear preventing member 320. The end of the insertion portion 321 of the wear preventing member 320 is curved.

  Next, a third embodiment will be described. 6A and 6B are views showing a wear preventing member according to a third embodiment, in which FIG. 6A is a perspective view, and FIG. 6B is a cross-sectional view corresponding to the line BB in FIG.

  Here, in the rotation mechanism in which the rotation shaft and the gear rotate integrally, after passing the gear through the rotation shaft 301, as shown in FIG. 7, grooves 307 and 308 of the rotation shaft 301 (FIG. 2C). ))), It is necessary to attach a retaining member 305 from the bearing 303 of the rotary shaft 301.

  In the wear preventing member 330 according to the present example, an insertion portion 331 is formed on the plate portion 332, and a retaining portion 334 that is inserted into the groove portion 308 of the rotating shaft 301 via the extending portion 333 is provided on the plate portion 332. It is integrally formed. In the wear preventing member 330 according to this example, the wear preventing member 330 includes a retaining portion 334, and the wear preventing member 330 also has a retaining function. According to this example, since the number of parts of the rotating mechanism can be reduced, not only the cost can be reduced, but also the assemblability can be improved.

  Next, a fourth embodiment will be described. FIG. 8 is a perspective view showing a friction preventing member according to the fourth embodiment. The friction preventing member 340 according to this example is formed integrally with the gear 302. The friction preventing member 340 is formed with an insertion portion 341 and a retaining portion 342 of the gear 302. The retaining portion 342 is fitted into a groove portion 308 (see FIG. 2C) formed on the rotating shaft 301 to prevent the rotating shaft 301 from coming out of the bearing 303. According to the friction preventing member 340, the number of parts can be reduced, the cost can be reduced, and the assemblability can be improved.

  Next, a fifth embodiment will be described. FIG. 9 is a perspective view showing a wear preventing member according to the fifth embodiment. The friction preventing member 350 according to the present example includes an insertion portion 351 inserted between the inner peripheral surface of the bearing 303 and the flat portion 304 of the rotating shaft 301, and the insertion portion 351 is provided upright, It is comprised from the collar member 352 in which the shaft through-hole 353 was formed while contacting a side surface. A tapered portion 354 is formed at the distal end of the insertion portion 351 of the wear preventing member 350. According to this example, the wear prevention member 350 can be easily attached to the slide bearing 303 during assembly.

  Next, a sixth embodiment will be described. FIG. 10 is a perspective view showing a rotation mechanism according to the sixth embodiment. The rotating mechanism 400 according to this example is configured by connecting a universal joint 410 to the tip of the rotating shaft 301 of the rotating mechanism 300 according to the first embodiment. In this example, the universal joint 410 is intended to transmit the driving force generated by the rotation of the rotating shaft 301 to the driven shaft. Since the universal joint 410 is swingable, the driving force can be transmitted even if the rotational axis center positions of the driving side and the driven side are slightly deviated.

  Here, if the rotation shaft centers of the drive shaft and the driven shaft are deviated, the joint swings and the rotation shaft receives a force from the universal joint when transmitting the drive force. Therefore, a vertical force is applied to the rotation shaft. Will act. When a vertical force is applied to the rotating shaft in this way, the rotating shaft is tilted by the gap between the rotating shaft and the bearing, and the parallelism between the rotating shaft and the bearing is deteriorated, so that the sliding portion becomes a point from contact with the line. It becomes the contact in. Under such conditions, the frictional force due to the rotation is more applied to the contact portion. Therefore, if there is a flat portion on the rotating shaft of the sliding portion, the wear of the bearing due to the edge of the flat portion increases. . Therefore, according to the rotation mechanism 400 provided with the wear preventing member according to the present invention, it is possible to prevent the wear inside the shaft from being promoted.

  Next, a seventh embodiment will be described. FIG. 11 is a perspective view showing a driving apparatus according to the seventh embodiment. The driving device 500 according to this example is disposed in the image forming apparatus, and includes a motor 510 and two rotation mechanisms 520 and 530. The motor 510 and the rotation mechanisms 520 and 530 are unitized. . According to the driving device 500, even if an increase in bearing load occurs due to a decrease in shaft position accuracy that is likely to occur when a plurality of rotating mechanisms are driven by a single motor, the sliding bearings of the rotating mechanisms 520 and 530 In addition to effectively preventing the occurrence of wear and abnormal noise, the ease of assembly and service maintenance can be improved.

1 is a schematic configuration diagram of a printer according to an embodiment. 1 shows a rotating mechanism according to a first embodiment, wherein (a) is a perspective view of the rotating mechanism, (b) is an enlarged perspective view from a direction different from (a), and (c) is a perspective view showing a rotating shaft. FIG. It is a perspective view which shows the abrasion prevention member used for the rotation mechanism shown in FIG. It is a schematic diagram which shows the modification of the abrasion prevention apparatus shown in FIG. It is a perspective view which shows the abrasion prevention member which is a 2nd Example. It is a figure which shows the abrasion prevention member which is a 3rd Example, (a) is a perspective view, (b) is sectional drawing equivalent to the BB line in (a). It is a perspective view of the rotation mechanism which shows retaining. It is a perspective view which shows the friction preventing member which is a 4th Example. It is a perspective view which shows the abrasion prevention member which is a 5th Example. It is a perspective view which shows the rotation mechanism which is a 6th Example. It is a perspective view which shows the drive device which is a 7th Example. It is a perspective view which shows the conventional rotation mechanism. It is a disassembled perspective view of the rotation mechanism shown in FIG. It is a schematic diagram which shows the arrangement state of a rotating shaft and a bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 200 ... Rotating mechanism 201 ... Rotating shaft 202 ... Gear 203 ... Bearing 204 ... Plane part 206 ... Hub 207 ... Gear side plane part 208 ... End part 300 ... Rotating mechanism 301 ... Rotating shaft 302 ... Gear 303 ... Sliding bearing 304 ... Plane part 305... Preventing members 307 and 308... Groove portion 310... Wear preventing member 311... Inserting portion 312 .. Shaft member 313 .. Shaft through hole 320. Wear preventing member 321 .... Inserting portion 322. 332 ... Plate part 333 ... Extension part 334 ... Engagement piece 340 ... Wear prevention member 341 ... Insertion part 342 ... Detachment part 350 ... Wear prevention member 351 ... Insertion part 352 ... Shaft member 353 ... Shaft through hole 354 ... Tapered part 400 ... Rotating mechanism 410 ... Universal joint 500 ... Drive device 510 ... Motors 520, 530 ... Rotating mechanism

Claims (17)

A deformed portion for coupling the rotation transmission member to the outer peripheral surface is disposed between the rotation shaft formed from the coupling portion of the rotation transmission member to at least one edge and a slide bearing that rotatably supports the end of the rotation shaft. An anti-abrasion member,
An insertion portion that is inserted into a gap formed between the deformed portion of the rotary shaft and an inner peripheral surface of the slide bearing, and a flange member that is disposed outside the slide bearing and into which the shaft member is inserted. A wear preventing member that rotates together with the rotating shaft.   The wear preventing member according to claim 1, wherein the insertion portion is formed smaller than a gap portion between the deformed portion of the rotating shaft and the slide bearing.   The wear preventing member according to claim 1, wherein a contour shape of the insertion portion on a side in contact with the plain bearing is an arc shape having a radius larger than a radius of the rotating shaft.   The wear preventing member according to claim 1, further comprising a retaining portion that is fitted to the rotating shaft and restricts movement of the rotating shaft in the axial direction.   The wear preventing member according to claim 1, wherein the wear preventing member is formed integrally with the power transmission member.   The wear preventing member according to any one of claims 1 to 5, wherein the insertion portion is made of the same material as the rotating shaft.   The wear preventing member according to any one of claims 1 to 5, wherein the insertion portion is made of a material having a higher slidability than the rotating shaft.   The wear preventing member according to any one of claims 1 to 5, wherein the insertion portion is made of an oil-impregnated material.   The wear preventing member according to any one of claims 1 to 8, wherein a tapered portion is formed at a longitudinal end of the insertion portion.   The wear preventing member according to any one of claims 1 to 9, wherein the deformed portion of the rotating shaft is configured as a flat portion.   The wear preventing member according to any one of claims 1 to 10, wherein the power transmission member is a gear.   The wear preventing member according to any one of claims 1 to 10, wherein the power transmission member is a timing pulley.   A rotation mechanism comprising the wear preventing member according to any one of claims 1 to 12.   15. A rotating mechanism comprising the rotating mechanism according to claim 14, wherein the rotating shaft is provided with a swingable universal joint at the tip.   A drive device comprising the rotation mechanism according to claim 13 or 14.   15. A drive device comprising at least two rotational drive transmission mechanisms according to claim 13 or 14.   An image forming apparatus comprising the driving device according to claim 15.