JP2015004757A - Rotor support structure and manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor support structure and a manufacturing method thereof which are capable of suppressing occurrence of abnormal noise without impairing attaching/detaching efficiency.SOLUTION: A rotor support structure comprises a rotor and a support shaft that supports the rotor in a freely rotatable manner. The support shaft consists of a cylindrical part in which a hollow part is formed from an end part side along an axis line, an undercut-shaped part provided for an outer peripheral surface of the end part side of the cylindrical part and prevents the rotor from falling, and notched parts formed on both sides of the undercut-shaped part from the end part side in an axis line direction of the support shaft. The undercut-shaped part is an R shape swollen outside the cylindrical part in a cross section of the cylindrical part in an axis line direction, and the notched parts are formed within a range where the undercut-shaped part formed in the cross section of the cylindrical part in the axis line direction.

Description

  The present invention relates to a rotating body support structure and a manufacturing method.

A rotating body, a mounted member that rotatably supports the rotating body, and a snap-fit member that removably supports the rotating body on the mounted member, and a portion that supports the rotating body and a removal of the rotating body There is known a rotating body mounting structure in which a locking portion for locking is provided in a different part (Patent Document 1).
In addition, in the method of manufacturing a cylindrical part using a mold, the part is molded using a mold having a bulge in the longitudinal center of the core that forms the center hole of the part, and is forcedly removed by elastic deformation of the part. Also known is a method of manufacturing a cylindrical part that is formed such that the center hole diameter of the part is larger at the center than at both ends by releasing (Patent Document 2).

JP 2003-206915 A JP 2002-96363 A

  An object of this invention is to provide the rotary body support structure which can suppress generation | occurrence | production of abnormal noise, and the manufacturing method thereof, without impairing attachment / detachment efficiency.

In order to solve the above-mentioned problem, the rotating body support structure according to claim 1,
A rotating body,
A support shaft that rotatably supports the rotating body,
A cylindrical portion in which a hollow portion is formed from an end side along the axis of the support shaft; an undercut shape portion provided on an outer peripheral surface on the end side of the cylindrical portion to prevent the rotating body from dropping; and A notch portion formed on both sides of the undercut shape portion from the end side in the axial direction of the support shaft,
It is characterized by that.

The invention according to claim 2 is the rotating body support structure according to claim 1,
The undercut shape portion has an R shape that bulges outside the cylindrical portion in the axial cross section of the cylindrical portion, and the undercut shape portion is formed in the axial cross section of the cylindrical portion. Formed within the range,
It is characterized by that.

The invention according to claim 3 is the rotating body support structure according to claim 1 or 2,
The undercut shape portion is
D2 + 2 × H> D1,
0.02 ≦ H / D2 ≦ 0.05,
Formed with a relationship of
It is characterized by that.
Here, the inner diameter of the shaft hole of the rotating body is D1, the outer diameter of the cylindrical portion of the support shaft is D2, and the cross-sectional height of the R shape is H.

In order to solve the above-mentioned problem, the manufacturing method of the rotating body support structure according to claim 4,
A movable side mold provided with a cavity for forming an outer peripheral wall portion of a shaft body provided with an undercut shape portion on the end side, and a hollow portion formed from the end side along the axis of the shaft body A core pin that forms a peripheral wall and a bottom inner wall; and a filling step of injecting and filling molten resin into a mold including:
A first mold releasing step of retreating the core pin from the inner peripheral wall and the bottom inner wall of the hollow portion of the shaft body in the mold in which the molten resin filled is solidified;
A second mold release step of forcibly removing the outer peripheral wall portion of the shaft body from the movable mold in a state where the core pin does not exist in the hollow portion of the shaft body after the core pin has moved backward.
It is characterized by that.

According to the first aspect of the present invention, in the support structure of the rotating body, it is possible to suppress the generation of abnormal noise without impairing the attachment / detachment efficiency.
According to invention of Claim 2, compared with the case where it does not have this structure, a rotary body can be attached or detached easily to a support shaft.
According to the third aspect of the present invention, it is possible to prevent the rotating body from falling off without impairing the attachment / detachment efficiency as compared with the case where the present configuration is not provided.
According to invention of Claim 4, the rotary body support structure which can suppress generation | occurrence | production of abnormal noise can be obtained easily, without impairing attachment / detachment efficiency.

(A) is a schematic cross-sectional view when the output gear 22 is fitted on the support shaft 192, and (b) is a schematic cross-sectional view showing a state in which the output gear 22 is rotatably fitted on the support shaft 192. 3 is a schematic cross-sectional view of a main part of a support shaft 192. FIG. It is a cross-sectional schematic diagram of the metal mold | die for manufacturing the support shaft 192 by injection molding. It is a cross-sectional schematic diagram explaining the flow of the process of injection-molding the support shaft 192. It is a principal part cross-sectional schematic diagram of the support shaft 192 in which the multiple undercut shape part 195 was formed. (A) is a schematic cross-sectional view of a state in which the output gear 22 is inserted into the support shaft 200 of the comparative example, and (b) is a schematic cross-sectional view of the main part of the support shaft 200 of the comparative example. It is a principal part cross-sectional schematic diagram of the metal mold | die which shape | molds the support shaft 200 of a comparative example. 1 is a schematic cross-sectional view illustrating an overall configuration of an image forming apparatus 100 to which a rotating body support structure is applied. (A) is a schematic diagram showing the arrangement of the gear train of the main drive device 180, and (b) is a schematic diagram showing the arrangement of the gear train of the paper discharge drive device 190.

Next, specific examples of embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.
In the following description using the drawings, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones, and are necessary for the description for easy understanding. Illustrations other than the members are omitted as appropriate.

(1) Overall Configuration and Operation of Image Forming Apparatus FIG. 8 is a schematic cross-sectional view showing the overall configuration of an image forming apparatus 100 as an example to which the rotating body support structure according to this embodiment is applied.
The overall configuration and operation of the image forming apparatus 100 will be described below with reference to the drawings.

  The image forming apparatus 100 includes a control device 110, a paper feeding device 120, a photosensitive unit 130, a developing device 140, an exposure device 150, a transfer device 160, and a fixing device 170.

  A paper feeding device 120 is provided at the bottom of the image forming apparatus 100. The sheet feeding device 120 includes a sheet cassette 121 that stores sheets as recording media, and a large number of sheets are stacked on the upper surface of the sheet cassette 121. The sheets stacked on the sheet cassette 121 and positioned in the width direction by a regulating plate (not shown) are pulled out one by one from the upper side and then conveyed to the nip portion of the registration roller pair 123.

  The photoreceptor unit 130 includes a photoreceptor drum 131 that is provided above the sheet feeding device 120 and is driven to rotate. A charging roller 132, a developing device 140, a transfer roller 161, and a cleaning blade 134 are arranged along the rotation direction of the photosensitive drum 131.

  The developing device 140 includes a developing housing 141 in which a developer is accommodated. In the developing housing 141, a developing roller 142 disposed to face the photosensitive drum 131 is disposed, and a layer regulating roll 146 that regulates the layer thickness of the developer is disposed close to the developing roller 142. .

  The exposure apparatus 150 includes a laser beam emitting unit 151 used as a light source, and a rotating polygon mirror (polygon mirror) 152 that deflects and reflects the laser beam LB from the laser beam emitting unit 151, according to image data to be formed. The surface of the photosensitive drum 131 is scanned with the modulated laser beam LB.

  The surface of the rotating photosensitive drum 131 is charged by the charging roller 132, and an electrostatic latent image is formed by the laser beam LB emitted from the exposure device 150. The electrostatic latent image formed on the photosensitive drum 131 is developed as a toner image by the developing roller 142.

  The transfer device 160 includes a rear cover 100b that supports the transfer roller 161 so as to be separable from the photosensitive drum 131, and a transfer roller 161 that forms a nip with the photosensitive drum 131. A transfer voltage is applied to the transfer roller 161, and the toner image on the photoconductive drum 131 is transferred to a sheet passing between the photoconductive drum 131 and the transfer roller 161.

  Residual toner on the surface of the photoconductive drum 131 is removed by the cleaning blade 134 and collected in the housing that supports the photoconductive drum 131. Thereafter, the surface of the photosensitive drum 131 is recharged by the charging roller 132.

The fixing device 170 includes a pair of fixing rollers 171 and 172, and a fixing region is formed by a pressure contact region between the pair of fixing rollers 171 and 172.
The sheet on which the toner image is transferred by the transfer roller 161 is conveyed to the fixing device 170 via the conveyance guide 162 in a state where the toner image is not fixed. The toner image is fixed on the sheet conveyed to the fixing device 170 by the action of pressure bonding and heating by a pair of fixing rollers 171 and 172. The sheet on which the fixing toner image is formed is guided by the conveyance guides 173a and 173b and is discharged from the discharge roller pair 174 to the discharge tray 100c on the upper surface of the image forming apparatus 100.

(2) Configuration and Operation of Driving Device In the image forming apparatus 100 configured as described above, the paper feeding device 120, the photosensitive unit 130, the developing device 140, the transfer device 160, and the fixing device 170 are rotationally driven as driving devices. For this purpose, a main drive device 180 including a motor M1 and a paper discharge drive device 190 that rotationally drives the discharge roller pair 174 are used.

(2.1) Main Drive Device FIG. 9A is a schematic diagram showing the arrangement of the gear train of the main drive device 180. As shown in FIG. 9A, the main drive device 180 includes a housing 181, a motor M <b> 1, and a gear train 10, and the housing 181 is fixed to a frame F (not shown) of the image forming apparatus 100. The gears constituting the gear train 10 are rotatably supported.

The gear train 10 includes an input gear 11 and an output gear 12 that meshes with the input gear 11. The input gear 11 is a pinion made of a helical gear and is formed directly on the output shaft of the motor M1.
The output gear 12 is a helical gear similar to the input gear 11 and is made of a resin such as POM (polyacetal), for example, and is rotatably supported on a support shaft standing on the housing 71. A support shaft consists of metals, such as SUS material (stainless steel) and SUM material (free-cutting steel), for example.

The output gear 12 meshes with the relay gears 14, 15, 16, and the relay gears 14, 15, 16 transmit the rotation to the photosensitive unit 130, the developing device 140, the transfer device 160, and the fixing device 170. The relay gear 13 meshes directly with the input gear 11 and transmits rotation to the paper feeding device 120.
Similarly to the output gear 12, the relay gears 13, 14, 15, and 16 are helical gears made of a resin such as POM (polyacetal) and formed by injection molding.

(2.2) Paper Discharge Drive Device FIG. 9B is a schematic diagram showing the arrangement of the gear train of the paper discharge drive device 190. As illustrated in FIG. 9B, the paper discharge driving device 190 includes a housing 191, a motor M <b> 2, and a gear train 20. The housing 191 is fixed to the frame F of the image forming apparatus 100, and the gear train. Each of the gears constituting 20 is rotatably supported.

(2.2.1) Gear train The gear train 20 has an input gear 21 and an output gear 22 as an example of a rotating body meshing with the input gear 21. The input gear 21 is a pinion made of a spur gear, and made of a resin such as POM (polyacetal).
The output gear 22 is a spur gear like the input gear 21 and is made of a resin such as POM (polyacetal), for example, and is freely rotatable on a support shaft 192 as an example of a rotating body support structure that is erected integrally with the housing 191. It is supported by. A plurality of relay gears 23 mesh with the output gear 22, and the relay gears 23 transmit the rotation to the discharge roller pair 174 and the like.

(2.2.2) Rotating Body Support Structure FIG. 1A is a schematic sectional view when the output gear 22 is fitted to the support shaft 192, and FIG. FIG. 2 is a schematic cross-sectional view of the main part of the support shaft 192. The housing 191 is made of synthetic resin, and is integrally formed with a support shaft 192 that rotatably supports the output gear 22 and the relay gear 23 as rotating bodies.

As synthetic resins, ABS (acrylonitrile butadiene styrene), modified PPE (polyphenylene ether), PC (polycarbonate), PET (polyethylene terephthalate), PS (polystyrene), PBT (polybutylene terephthalate), PP (polypropylene), PA (polyamide) ), PMMA (polymethyl methacrylate), PPO (polyphenylene oxide) and the like.
Further, PC / ABS (alloy of polycarbonate and acrylonitrile butadiene styrene) is preferable from the specifications of the image forming apparatus 100 to be applied and the required manufacturing cost.

  The support shaft 192 includes a cylindrical portion 194 having a hollow portion 193 formed from the end side along the axis, an undercut shape portion 195 provided on the outer peripheral surface 194a on the end portion side of the cylindrical portion 194, and an undercut shape. It is comprised from the both sides of the part 195 with the notch part 196 formed in the axial direction from the edge part side. In the drawing, the undercut shape portion 195 is drawn larger than the actual size for the sake of explanation.

The undercut shape portion 195 is formed as an R shape that bulges outside the outer peripheral surface 194 a in the axial section of the cylindrical portion 194.
The undercut shape portion 195 is formed so as to have the relationship of the expressions (1) and (2).
D2 + 2 × H> D1 (1)
0.02 ≦ H / D2 ≦ 0.05 (2)
Here, the inner diameter of the shaft hole of the output gear 22 supported by the support shaft 192 is D1, the shaft diameter of the outer peripheral surface 194a of the support shaft 192 is D2, and the R-shaped cross-sectional height is H.

As an example, when the inner diameter D1 of the shaft hole of the output gear 22 is 4 mm, the R-shaped cross-section height H of the undercut shape portion 195 is 0.077 mm to 0.18 mm, and the rotation inserted into the support shaft 192 is performed. The output gear 22 as a body is prevented from falling off from the support shaft 192. Therefore, the assembling work for assembling the discharge driving device 190 to the frame F of the image forming apparatus 100 is facilitated.
Further, by providing a chamfered shape of C0.1 to C0.25 on both end faces of the shaft hole of the output gear 22, the output gear 22 can be easily inserted into the support shaft 192.

  Notches 196 are formed on both sides of the undercut shape portion 195. The notch portion 196 is formed within the range where the undercut shape portion 195 is formed in the axial cross section of the cylindrical portion 194 from the end portion of the support shaft 192 (see FIG. 2). The stress generated in the shape portion 195 is relieved.

  The notch portion 196 is provided with a size corresponding to the range in which the undercut shape portion 195 is formed in the axial section of the cylindrical portion 194 from the end portion of the support shaft 192, and is an output gear fitted into the cylindrical portion 194. The movement of 22 is restricted by the undercut shape portion 195 in the axial direction. Therefore, the parting line PL of the mold that forms a notch 196 described later does not reach the sliding surface of the shaft hole of the output gear 22, and is accompanied by uneven wear and rotation of the shaft hole in the sliding surface. Abnormal noise is suppressed.

If the undercut shape portion 195 is formed in at least one outer peripheral surface 194 a on the end portion side of the cylindrical portion 194, the output gear 22 as a rotating body fitted into the support shaft 192 is connected to the support shaft 192. It can be prevented from falling off.
As shown in FIG. 5, a plurality of undercut shape portions 195 may be formed at equal intervals on the outer peripheral surface 194 a on the end portion side of the cylindrical portion 194. As will be described later, when the undercut shape portion 195 is forcibly punched and molded, the mold release resistance is evenly distributed, so that galling generated in the mold can be suppressed.

(3) Manufacturing Method of Rotating Body Support Structure FIG. 6A is a schematic cross-sectional view showing a state where the output gear 22 as a rotating body is fitted on the support shaft 200 of the comparative example, and FIG. 6B is a comparative example. It is a principal part cross-sectional schematic diagram of the support shaft 200 of.
Hereinafter, before explaining the manufacturing method of the support shaft 192 as the rotating body support structure according to the present embodiment, a rotating body support structure using a snap fit and a problem of the manufacturing method will be described as a comparative example.

(3.1) Rotating Body Support Structure and Manufacturing Method of Comparative Example As shown in FIG. 6A, the support shaft 200 includes a cylindrical portion 202 in which a hollow portion 201 is formed from the end side along the axis, The snap fit portion 203 is provided on the outer peripheral surface 202a of the cylindrical portion 202, and notches 204 are formed on both sides of the snap fit portion 203 in the axial direction from the end side.

As shown in FIG. 6B, the snap fit portion 203 has a claw portion 204 that protrudes outside the outer peripheral surface 202 a in the axial cross section of the cylindrical portion 202. The claw portion 204 prevents the output gear 22 as a rotating body inserted and inserted into the support shaft 200 from falling off the support shaft 200.
Further, the snap fit portion 203 is bent toward the hollow portion 201 side of the support shaft 200, so that the output gear 22 as a rotating body is inserted into the support shaft 200.

FIG. 7 is a schematic cross-sectional view of an essential part of a mold used to mold the support shaft 200 of the comparative example.
The claw portion 204 protruding outside the outer peripheral surface 202 a of the cylindrical portion 202 is formed by the slide core S. After injecting and filling the molten resin, the slide core S moves away from the outer peripheral surface 202a of the cylindrical portion 202 as the movable side moves, so that a snap fit portion 203 and a claw portion 204 are formed.

  However, a dividing line PL is formed on the mating surface of the slide core S. Although the dividing line PL depends on the processing accuracy of the mating surface of the slide core S, a step of 0.01 mm to 0.02 mm is likely to occur, and the step remains on the outer peripheral surface 202 a of the cylindrical portion 202, and the output gear 22. There is a possibility that abnormal noise is generated due to uneven wear and rotation of the shaft hole in the sliding surface of the shaft hole.

  As a result, lubricant was supplied to the sliding surface of the shaft hole of the output gear 22 as the support shaft 200 and the rotating body to suppress uneven wear of the shaft hole and abnormal noise accompanying rotation. There have been problems such as an increase in cost due to the use of a lubricant, and a depletion of the lubricant due to a long-term use, thereby reducing the effect of suppressing abnormal wear due to shaft shaft uneven wear and rotation.

(3.2) Molding of Support Shaft FIG. 3 is a schematic cross-sectional view showing an example of a mold for producing a support shaft 192 as a rotating body support structure by injection molding, and FIG. 4 is an injection molding of the support shaft 192. It is a cross-sectional schematic diagram explaining the flow of the process to do.
As shown in FIG. 3, the support shaft 192 as the rotating body support structure according to this embodiment is provided with a cavity CA that forms an outer peripheral wall portion of a cylindrical portion 194 provided with an undercut shape portion 195 on the end side. The movable side mold MA, the core pin MB forming the inner peripheral wall 193a and the bottom inner wall 193b of the hollow part 193 formed from the end side along the axis of the cylindrical part 194, and the molded support shaft 192 on the movable side It is manufactured by injection molding using a mold having an ejector pin EP for protruding from the mold MA.

  Specifically, a filling step S1 (FIG. 4 (a)) for injecting and filling molten resin from the gate G into the mold, and the inside of the hollow portion 193 in the mold in which the injected and filled molten resin is solidified. In the state where the core pin MB does not exist in the hollow portion 193 of the cylindrical portion 194 after the first mold release step S2 (FIG. 4B) for retracting the core pin MB from the peripheral wall 193a and the bottom inner wall 193b and the core pin MB retracts. The outer peripheral wall portion 194a of the cylindrical portion 194 including the undercut shape portion 195 is manufactured through a second release step S3 (FIG. 4C) forcibly removing it from the movable side mold MA.

According to the manufacturing method of the rotating body support structure according to the present embodiment, in the mold opening operation of the mold, first, the core pin MB is removed from the inner peripheral wall 193a and the bottom inner wall 193b of the hollow portion 193 in the mold in which the molten resin is solidified. A first release step S2 (FIG. 4B) for retreating is performed.
As a result, the hollow portion 193 is formed from the end portion side of the cylindrical portion 194 in the cavity CA of the movable side MA that forms the outer peripheral wall portion 194a of the cylindrical portion 194 provided with the undercut shape portion 195. become.

  Then, after the core pin MB is retracted, the ejector pin EP is moved upward in the state where the core pin MB is not present in the hollow portion 193 of the cylindrical portion 194, and the formed support shaft 192 is protruded to include the undercut shape portion 195. A second release step S3 (FIG. 4 (c)) for forcibly removing the outer peripheral wall portion 194a of the cylindrical portion 194 from the movable side mold MA is performed.

By such an operation, the undercut shape portion 195 is bent toward the inside of the hollow portion 193 formed from the end portion side of the cylindrical portion 194, and the stress acting on the undercut shape portion 195 from the cavity CA of the movable side MA is relieved. The
Further, since the undercut shape portion 195 is formed as an R shape that bulges outside the outer peripheral surface 194a in the axial section of the cylindrical portion 194, the support shaft 192 that is a molded product and the movable side are formed at the time of release. The frictional force acting between the mold MA is further alleviated.

  As a result, when the movable side MA is forcibly removed from the outer peripheral wall portion of the cylindrical portion 194, there is no possibility that the undercut shape portion 195 is damaged. Further, the frictional force acting between the support shaft 192, which is a molded product, and the movable-side mold MA at the time of mold release is relaxed, and the life of the mold can be extended.

(4) Action / Effect A support shaft 192 as a rotating body support structure according to the present embodiment includes a cylindrical portion 194 in which a hollow portion 193 is formed from the end side along the axis, and an end portion side of the cylindrical portion 194. An undercut shape portion 195 provided on the outer peripheral surface 194a and a notch portion 196 formed on both sides of the undercut shape portion 195 in the axial direction from the end side.
Therefore, the output gear 22 as a rotating body is prevented from falling off the support shaft 192, and the output gear 22 can be easily inserted into the support shaft 192.

  The undercut shape portion 195 is formed as an R shape that bulges outside the outer peripheral surface 194 a in the axial section of the cylindrical portion 194, and chamfers of C0.1 to C0.25 are formed on both end surfaces of the shaft hole of the output gear 22. By providing the shape, the insertion of the output gear 22 into the support shaft 192 is further facilitated.

  According to the rotating body support structure according to the present embodiment, the cutout portion 196 has a size corresponding to the range in which the undercut shape portion 195 is formed in the axial section of the cylindrical portion 194 from the end portion of the support shaft 192. The output gear 22 that is provided and fitted in the cylindrical portion 194 is supported by the undercut shape portion 195 in the axial direction so as to be freely rotatable. For this reason, the dividing line PL of the mold forming the notch 196 does not reach the sliding surface of the shaft hole of the output gear 22, and the abnormal noise caused by the uneven wear and rotation of the shaft hole in the sliding surface. Is suppressed.

  As mentioned above, although embodiment concerning this invention was explained in full detail, this invention is not limited to the said embodiment, A various change is made within the range of the summary of this invention described in the claim. Is possible.

For example, in the present exemplary embodiment, the rotating body support structure is described as being applied to the paper discharge driving device 190 provided in the image forming apparatus 100. However, the rotating body support structure is not limited to a gear as a rotating body, and may be a cylinder. It may be in the form of a roller.
Further, the present invention can be applied not only to a driving device but also to a gear train of a photosensitive unit or a developing device.

DESCRIPTION OF SYMBOLS 100 ... Image forming apparatus 110 ... Control apparatus 120 ... Paper feeding apparatus 130 ... Photoconductor unit
140... Developing device
150... Exposure apparatus
160 ... Transfer device
170... Fixing device
180 ... Main drive unit
190 ... paper discharge drive
191: Housing 192, 200 ... Support shaft 193, 201 ... Hollow part 193a ... Inner peripheral wall
193b ... Bottom inner wall 194, 202 ... Cylindrical part 194a, 202a ... Outer peripheral surface
195: Undercut shape part 196 ... Notch part 203 ... Snap fit part 204 ... Claw part MA ... Movable side type MB ... Core pin EP ... Ejector pin PL ... Dividing line (mold)

Claims (4)

A rotating body,
A support shaft that rotatably supports the rotating body,
A cylindrical portion in which a hollow portion is formed from an end side along the axis of the support shaft; an undercut shape portion provided on an outer peripheral surface on the end side of the cylindrical portion to prevent the rotating body from dropping; and A notch portion formed on both sides of the undercut shape portion from the end side in the axial direction of the support shaft,
A rotating body support structure characterized by that. The undercut shape portion has an R shape that bulges outside the cylindrical portion in the axial cross section of the cylindrical portion, and the undercut shape portion is formed in the axial cross section of the cylindrical portion. Formed within the range,
The rotating body support structure according to claim 1. The undercut shape portion is
D2 + 2 × H> D1,
0.02 ≦ H / D2 ≦ 0.05,
Formed with a relationship of
The rotating body support structure according to claim 1 or 2, wherein
Here, the inner diameter of the shaft hole of the rotating body is D1, the outer diameter of the cylindrical portion of the support shaft is D2, and the cross-sectional height of the R shape is H. A movable side mold provided with a cavity for forming an outer peripheral wall portion of a shaft body provided with an undercut shape portion on the end side, and a hollow portion formed from the end side along the axis of the shaft body A core pin that forms a peripheral wall and a bottom inner wall; and a filling step of injecting and filling molten resin into a mold including:
A first mold releasing step of retreating the core pin from the inner peripheral wall and the bottom inner wall of the hollow portion of the shaft body in the mold in which the molten resin filled is solidified;
A second mold release step of forcibly removing the outer peripheral wall portion of the shaft body from the movable mold in a state where the core pin does not exist in the hollow portion of the shaft body after the core pin has moved backward.
A method of manufacturing a rotating body support structure, comprising:

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