JP6481656B2 - Planetary gear mechanism and image forming apparatus - Google Patents

Description

  The present invention relates to a planetary gear mechanism and an image forming apparatus.

  A plurality of planetary gears, an internal gear that meshes with the planetary gear, a sun gear that is arranged coaxially with the internal gear, and that transmits to the planetary gear, and supports the plurality of planetary gears so that they can rotate. In a planetary gear mechanism having a carrier that is freely floating supported and in which an internal gear or a sun gear is fixed so as not to rotate, a hole through which a rod-like member can penetrate is provided in the direction of the rotation axis of the carrier, and is opposed to the carrier A planetary gear mechanism having a mounting portion for mounting a rod-like member on a facing surface portion is known (Patent Document 1).

JP 2013-213559 A

  An object of the present invention is to provide a planetary gear mechanism and an image forming apparatus that are inexpensive and can suppress vibration, noise, and rotation unevenness due to carrier backlash.

In order to solve the above-mentioned problem, the planetary gear mechanism according to claim 1,
A sun gear that rotates by receiving a driving force via an input shaft;
An internal gear provided on the inner surface of the cylindrical body and arranged coaxially with the sun gear;
A planetary gear that revolves while rotating in mesh with the sun gear and the internal gear;
A rotating member that supports the shaft of the planetary gear, and whose peripheral portion is in rotation contact with the inner surface of the cylindrical body and rotates around the input shaft by the revolution of the planetary gear,
A part of the rotating member and a side surface facing the input shaft direction of the internal teeth of the internal gear meshing with the planetary gear are arranged so as to overlap when viewed from the drive transmission direction.
It is characterized by that.

In order to solve the above problem, the planetary gear mechanism according to claim 2 ,
A sun gear that rotates in response to a driving force;
An internal gear provided on the inner surface of the cylindrical body and arranged coaxially with the sun gear;
A planetary gear that revolves while rotating in mesh with the sun gear and the internal gear;
The peripheral portions of the disk portions that support the planetary gear shaft facing each other are arranged so as to face the side surfaces of the cylindrical body facing the input shaft direction, and are rotated by the revolution of the planetary gear. A rotating member that comprises:
It is characterized by that.

The invention according to claim 3 is the planetary gear mechanism according to claim 1 or 2 ,
The internal gear is composed of a plurality, and the peripheral edge portion is disposed so as to be sandwiched between side surfaces facing the input shaft direction of the adjacent internal gear.
It is characterized by that.

In order to solve the above problem, the planetary gear mechanism according to claim 4 ,
A sun gear that rotates in response to a driving force;
An internal gear provided on the inner surface of the cylindrical body and arranged coaxially with the sun gear;
A planetary gear that revolves while rotating in mesh with the sun gear and the internal gear;
The peripheral portions of the disk portions that face each other and support the shaft of the planetary gear are arranged so as to be sandwiched between the side surfaces facing the input shaft direction of the adjacent internal gear, and by the revolution of the planetary gear, A rotating member that rotates;
A case body in which the internal gear is housed in a non-rotatable manner,
It is characterized by that.

The invention according to claim 5 is the planetary gear mechanism according to any one of claims 2 to 4 ,
The rotating member is integrally formed with a first disc portion, a second disc portion facing the first disc portion, and an output element that projects from the second disc portion in the drive transmission direction and outputs a driving force. ing,
It is characterized by that.

The invention according to claim 6 is the planetary gear mechanism according to claim 5 ,
The output element is an input element of any one of a gear-type transmission mechanism, a contact joint mechanism, and a non-contact joint mechanism that transmits a driving force of the rotating member to a driven body.
It is characterized by that.

The invention according to claim 7 is the planetary gear mechanism according to claim 4 ,
The case body has a bulging portion that penetrates the output element so that the output element is exposed to the outside of the case body, and is fastened with an attached body that attaches the case body to an outer surface of the bulging portion. A male screw is formed,
It is characterized by that.

The invention according to claim 9 is the planetary gear mechanism according to any one of claims 1 to 8,
The internal gear has a convex part and a concave part that fit between adjacent internal gears,
It is characterized by that.

In order to solve the above-mentioned problem, the planetary gear mechanism according to claim 10,
A sun gear that rotates in response to a driving force;
An internal gear provided on the inner surface of the cylindrical body and arranged coaxially with the sun gear;
A planetary gear that revolves while rotating in mesh with the sun gear and the internal gear;
The shaft of the planetary gear is supported, and a part of the planetary gear is rotationally supported so as to overlap with a side surface of the cylindrical body facing the input shaft direction of the inner teeth when viewed from the drive transmission direction. A rotating member that rotates by the revolution of the planetary gear,
A case body in which the internal gear is housed in a non-rotatable manner ,
It is characterized by that.

In order to solve the above problem, an image forming apparatus according to claim 10 ,
A rotating body,
A drive source for driving the rotating body;
The planetary gear mechanism according to any one of claims 1 to 9 , wherein the rotational speed of the drive source is reduced and transmitted to the rotating body.
It is characterized by that.

According to the first aspect of the present invention, the inclination of the rotating member can be suppressed as compared with a configuration in which the peripheral edge of the rotating member is not rotationally supported on the inner surface of the internal gear hollow portion.
According to invention of Claim 2 , the inclination of a rotation member can be suppressed.
According to invention of Claim 3 , the inclination of a rotation member can be suppressed.
According to invention of Claim 4 , the inclination of a rotating member can be suppressed.
According to the fifth aspect of the present invention, assembly errors can be suppressed.
According to the sixth aspect of the present invention, a plurality of drive transmission mechanisms can be selected.
According to invention of Claim 7 , it can attach to a to-be-attached body easily.
According to invention of Claim 8 , it can assemble, preventing the phase shift of an internal gear.
According to invention of Claim 9 , the inclination of a rotation member can be suppressed.
According to the invention of claim 1 0, it is possible to suppress vibration, noise and uneven rotation.

1 is a schematic cross-sectional view showing an internal configuration of an image forming apparatus. It is a disassembled perspective view which shows an example of the planetary gear mechanism which concerns on 1st Embodiment. (A) is a partial cross-sectional perspective view which shows an example of a planetary gear mechanism, (b) is a longitudinal cross-sectional view. (A) is a perspective view with the viewpoint on the first disc portion side of the carrier, (b) is a perspective view with the viewpoint on the output shaft side, and (c) is an output of the carrier with the sun gear integrated therewith. It is the perspective view which put a viewpoint on the axial side. It is a perspective view of an internal gear. It is a perspective view which shows the assembly | attachment to the carrier of a planetary gear. It is a perspective view of the internal gear with which the carrier which rotationally supported the planetary gear was assembled | attached. FIG. 2 is an exploded perspective view of a planetary gear mechanism having a plurality of stages according to the first embodiment. 6 is a partial cross-sectional perspective view of a geared motor according to Embodiment 2. FIG. (A) is a perspective view of the external-tooth reduction mechanism which concerns on Example 3, (b) is a front view. It is a longitudinal cross-sectional view of the planetary gear mechanism according to the second embodiment. It is a perspective view of the internal gear concerning 2nd Embodiment. It is a perspective view which shows the form of the output element of the output shaft of a carrier. (A) is a perspective view which shows an example of the planetary gear mechanism which concerns on 2nd Embodiment, (b) is a perspective view which shows an example of a case body.

Next, the present invention will be described in more detail with reference to the drawings with reference to embodiments and specific examples. However, the present invention is not limited to these embodiments and specific examples.
Also, in the description using the following drawings, it should be noted that the drawings are schematic and the ratio of each dimension and the like are different from the actual ones, and are necessary for the description for easy understanding. Illustrations other than the members are omitted as appropriate.
In order to facilitate understanding of the following description, in the drawings, the front-rear direction is the X-axis direction, the left-right direction is the Y-axis direction, and the up-down direction is the Z-axis direction.

“First Embodiment”
(1) Overall Configuration and Operation of Image Forming Apparatus FIG. 1 is a schematic cross-sectional view showing the internal configuration of the image forming apparatus 1 according to this embodiment. Hereinafter, the overall configuration and operation of the image forming apparatus 1 will be described with reference to the drawings.

  The image forming apparatus 1 includes a control device 10, a paper feeding device 20, a photoreceptor unit 30, a developing unit 40, a transfer unit 50, and a fixing device 60. On the upper surface (Z direction) of the image forming apparatus 1, a discharge tray 1a for discharging and storing a sheet on which an image is recorded is formed.

  The control device 10 includes an image forming device control unit 11 that controls the operation of the image forming device 1, a controller unit 12 that prepares image data according to a print processing request, an exposure control unit 13 that controls lighting of the exposure head LH, It has a power supply device 14 and the like. The power supply device 14 applies a voltage to a charging roller 32, a developing roller 42, a primary transfer roller 52, a power supply roller 54 and the like, which will be described later, and also includes an exposure head LH, a paper feeding device 20, a fixing device 60, and each sensor provided. To supply power.

  The controller unit 12 converts print information input from an external information transmitting apparatus (for example, a personal computer) into image information for forming a latent image and outputs a drive signal to the exposure head LH at a preset timing. . The exposure head LH of the present embodiment is configured by an LED head in which a plurality of light emitting elements (LEDs) are linearly arranged along the main scanning direction.

  A paper feeding device 20 is provided at the bottom of the image forming apparatus 1. The sheet feeding device 20 includes a sheet stacking plate 21, and a plurality of sheets P as recording media are stacked on the upper surface of the sheet stacking plate 21. The paper P loaded on the paper stacking plate 21 and whose position in the width direction is determined by a regulating plate (not shown) is pulled out one by one from the top by the paper pulling unit 22 (−X direction), and then registered. It is conveyed to the nip portion of the pair 23.

  The photoconductor unit 30 includes a photoconductor drum 31 that is provided in parallel above the paper feeding device 20 (in the Z direction) and serves as an image carrier that is rotationally driven. A charging roller 32, an exposure head LH, a developing unit 40, a primary transfer roller 52, and a cleaning blade 34 are arranged along the rotation direction of the photosensitive drum 31. A cleaning roller 33 for cleaning the surface of the charging roller 32 is disposed opposite to and in contact with the charging roller 32.

The developing unit 40 has a developing housing 41 in which a developer is accommodated. In the developing housing 41, a developing roller 42 disposed to face the photosensitive drum 31, and a pair of augers 44 that stir and convey the developer to the developing roller 42 side obliquely below the back side of the developing roller 42, 45 is arranged. A layer regulating member 46 that regulates the layer thickness of the developer is disposed in proximity to the developing roller 42.
Each of the developing units 40 is configured in the same manner except for the developer contained in the developing housing 41, and each forms a toner image of yellow (Y), magenta (M), cyan (C), and black (K). .

  The surface of the rotating photosensitive drum 31 is charged by the charging roller 32, and an electrostatic latent image is formed by the latent image forming light emitted from the exposure head LH. The electrostatic latent image formed on the photosensitive drum 31 is developed as a toner image by the developing roller 42.

  The transfer unit 50 includes an intermediate transfer belt 51 to which each color toner image formed on the photoconductive drum 31 of each photoconductor unit 30 is transferred, and each color toner image formed on each photoconductor unit 30 to the intermediate transfer belt. A primary transfer roller 52 that sequentially transfers (primary transfer) to 51 is provided. Further, a secondary transfer roller 53, which is an example of a transfer unit that collectively transfers (secondary transfer) each color toner image transferred on the intermediate transfer belt 51 onto the paper P, and secondary transfer to the secondary transfer roller 53. The power supply roller 54 is an example of a power supply member that supplies power to the bias.

  Each color toner image formed on the photosensitive drum 31 of each photosensitive unit 30 is transferred to an intermediate transfer belt by a primary transfer roller 52 to which a predetermined transfer voltage is applied from a power supply device 14 or the like controlled by the image forming apparatus control unit 11. Electrostatic transfer (primary transfer) is sequentially performed on 51, and a superimposed toner image in which toners of respective colors are superimposed is formed.

  The superimposed toner image on the intermediate transfer belt 51 is conveyed to a region (secondary transfer portion T) where the secondary transfer roller 53 is disposed as the intermediate transfer belt 51 moves. When the superimposed toner image is conveyed to the secondary transfer unit T, the paper P is supplied from the paper feeding device 20 to the secondary transfer unit T in accordance with the timing. A predetermined transfer voltage is applied to the power supply roller 54 from the power supply device 14 or the like controlled by the image forming apparatus control unit 11, and the intermediate transfer is performed on the paper P that is fed from the registration roller pair 23 and guided by the conveyance guide. Multiple toner images on the belt 51 are collectively transferred.

  Residual toner on the surface of the photosensitive drum 31 is removed by the cleaning blade 34 and collected in the waste developer container. The surface of the photosensitive drum 31 is recharged by the charging roller 32. Residues that cannot be completely removed by the cleaning blade 34 and adhere to the charging roller 32 are captured and accumulated on the surface of the cleaning roller 33 that rotates in contact with the charging roller 32.

  The fixing device 60 includes a fixing unit 600, a conveyance roller pair 68, and a discharge roller pair 69. The fixing unit 600 includes a heating module 61 and a pressure module 62, and a fixing nip portion N (fixing area) is formed by a pressure contact area between the heating module 61 and the pressure module 62.

The paper P on which the toner image is transferred in the transfer unit 50 is conveyed to the fixing device 60 via the conveyance guide in a state where the toner image is not fixed. The toner image is fixed on the sheet P conveyed to the fixing device 60 by a pair of heating module 61 and pressure module 62 by the action of pressure bonding and heating.
The sheet P on which the fixing toner image is formed is discharged from the discharge roller pair 69 to the discharge tray 1 a on the upper surface of the image forming apparatus 1 via the conveyance roller pair 68.

(2) Planetary gear mechanism FIG. 2 is an exploded perspective view showing an example of the planetary gear mechanism 100, FIG. 3A is a partial sectional perspective view showing an example of the planetary gear mechanism 100, and FIG. 4 (a) is a perspective view with the viewpoint on the first disc portion 151 side of the carrier 150, (b) is a perspective view with the viewpoint on the output shaft 153 side, and (c) is a sun gear 120A provided integrally. FIG. 5 is a perspective view of the internal gear 130, FIG. 6 is a perspective view showing the assembly of the planetary gear 140 to the carrier 150, and FIG. 7 is the planetary gear 140. It is a perspective view of the internal gear 130 with which the carrier 150 which rotatably supported was assembled.
Hereinafter, the configuration and operation of the planetary gear mechanism 100 will be described with reference to the drawings.

(2.1) Overall Configuration of Planetary Gear Mechanism FIG. 2 shows an example in which the planetary gear mechanism according to the present embodiment has a three-stage configuration, but the planetary gear mechanism according to the present embodiment is required. Depending on the reduction ratio, it can be overlaid.

  As shown in FIGS. 3A and 3B, the planetary gear mechanism 100 includes an input shaft 110, a sun gear 120 that rotates by receiving a driving force from the input shaft 110, and an inner shaft arranged coaxially with the sun gear 120. The toothed gear 130, the sun gear 120 and the internal gear 130 mesh with each other, support a plurality of planetary gears 140 that revolve while rotating, and the shaft 141 of the planetary gear 140, and rotate around the input shaft 110 by the revolution of the planetary gear 140. It comprises a carrier 150 as a rotating member.

(2.2) Input shaft One end of the input shaft 110 is connected to a motor M (not shown) as a drive source, and transmits the driving force of the motor M to the sun gear 120. In the present embodiment, the D surface 121 formed in the shaft hole of the sun gear 120 is fitted into the D surface 111 formed on the shaft to transmit the driving force.
The input shaft 110 rotatably supports the carrier 150 through the center hole 153a of the output shaft 153 of the carrier 150 of the planetary gear mechanism 100 in which the other end side is stacked in a plurality of stages.

(2.3) Carrier As shown in FIGS. 4A and 4B, the carrier 150 as an example of the rotating member includes a first disc portion 151 and a second disc facing the first disc portion 151. The output shaft 153 protruding in the input shaft direction from the portion 152 and the second disc portion 152 is integrally formed.

  The first disc portion 151 and the second disc portion 152 are formed with groove portions 154 and 155 that open in the radial direction by opening the respective peripheral portions 151a and 152a. The groove portions 154 and 155 have a bottom portion formed in a circular shape, and have a snap-fit structure for rotating and supporting the shaft portion 141 of the planetary gear 140 and positioning the inserted shaft portion 141 (see FIG. 6).

The first disc portion 151 has a larger-diameter flange shape than the second disc portion 152, and the peripheral portion 151a is rotatably supported by the inner surface 132 of the hollow portion of the internal gear 130, which will be described later. With 140 revolutions, the input shaft 110 rotates about the rotation center.
The second disc portion 152 has a smaller diameter than the tip circle of the internal tooth 133 of the internal gear 130 and is inserted into the input shaft 110 in a state in which the planetary gear 140 is incorporated, so that the planetary gear 140 is the internal gear. It meshes with the internal teeth 133 formed on the inner surface 132 of the hollow portion 130 (see FIG. 7).

An output shaft 153 protruding in the axial direction of the input shaft 110 is integrally formed on the outer surface of the second disc portion 152.
In the case where a plurality of stages are overlapped, as shown in FIG. 3C, the carrier 150 other than the most downstream (final stage) in the drive transmission direction has the sun gear 120A as the output shaft and the second disc part. 152 is integrally provided.

(2.4) Internal Gear As shown in FIG. 5, the internal gear 130 includes a cylindrical cylinder 131 having a hollow portion as a whole and an internal tooth formed at the center of the inner surface 132 of the cylinder 131. 133.
Both sides of the inner surface 132 on which the inner teeth 133 are formed are cylindrical, and the peripheral edge portion 151a of the first disc portion 151 of the carrier 150 is in contact with one end side to rotatably support the carrier 150 from the outside.

  The cylindrical body 131 is formed with a convex portion 131a protruding in the axial direction of the input shaft 110 and a concave portion 131b that fits the convex portion 131a. When the cylindrical body 131 is formed by overlapping a plurality of stages, the convex portion 131a and the concave portion 131b are fitted. Accordingly, the planetary gear mechanism 100 is coaxially overlapped.

(2.5) Material The input shaft 110, the sun gear 120, the internal gear 130, the planetary gear 140, and the carrier 150 of the planetary gear mechanism 100 are formed of a molded product using a synthetic resin material. Synthetic resin materials include POM (polyacetal), PA (polyamide), PC (polycarbonate), PET (polyethylene terephthalate), PPS (polyphenylene sulfide), LCP (liquid crystal polymer), or synthetic fibers made of glass fiber or carbon fiber. Examples include reinforced synthetic resin added.

(2.6) Carrier Support Structure The planetary gear mechanism 100 configured as described above has an output shaft 153 formed by protruding the carrier 150 in the axial direction of the input shaft 110 on the outer surface of the second disc portion 152. The peripheral edge portion 151 a of the first disc portion 151 is in contact with one end of both sides of the inner surface 132 of the internal gear 130 and is rotatably supported by the penetrating input shaft 110.
As a result, the carrier 150 that rotates and supports the plurality of planetary gears 140 that rotate while revolving while meshing with the sun gear 120 and the internal gear 130 is supported at both ends with the planetary gears 140 interposed therebetween, and vibration due to rattling of the carrier 150, Noise and rotation unevenness are suppressed.

The input shaft 110 rotates and supports the carrier 150 that is stacked in multiple stages through the center hole 153a of the output shaft 153 of the carrier 150, and each carrier 150 is positioned coaxially.
Therefore, it is the structure which can suppress the dispersion | variation in the coaxial degree of each planetary gear mechanism 100 superimposed.

(2.7) Operation The input shaft 110 is rotated by driving the motor M, and the sun gear 120 fitted to the input shaft 110 is rotationally driven. When the sun gear 120 is driven to rotate, each of the three planetary gears 140 rotates around its own shaft portion 141 as the rotation center. Each of the three planetary gears 140 revolves around the input shaft 110 because it meshes with the internal teeth 133 of the internal gear 130.

  When the revolution of the three planetary gears 140 is started, the shaft portion 141 of the planetary gear 140 also revolves around the input shaft 110, and the carrier 150 that supports the planetary gear 140 decelerates against the rotation of the sun gear 120. Start spinning. When deceleration rotation of the carrier 150 is started, deceleration rotation of the output shaft 143 formed integrally with the carrier 150 is started.

When the planetary gear mechanism 100 is configured by overlapping a plurality of stages as shown in FIG. 3 (three stages in the example of FIG. 3), the planetary gear mechanism 100 is provided on the outer surface of the second disk portion 152 of the carrier 150 and is rotated at a reduced speed. The sun gear 120 </ b> A that acts as an input to the second stage planetary gear mechanism 100.
In the second stage planetary gear mechanism, the second stage planetary gear 140 that meshes with the second stage internal gear 130 and the second stage sun gear 120A is supported by the second stage carrier 150, The outer periphery of the second stage sun gear 120A is revolved while rotating. Then, the second stage carrier 150 that supports the shaft portion 141 of the revolving planetary gear 140 rotates at a reduced speed.

  A sun gear 120A is provided on the outer surface of the second disk portion 152 of the second stage carrier 150 that rotates at a reduced speed, and the third stage meshes with the third stage internal gear 130 and the third stage gear 120A. The planetary gear 140 of the eye is supported by the third-stage carrier 150 and revolves around the outer periphery of the third-stage sun gear 120A while rotating. An output shaft 153 through which the input shaft 110 passes is provided on the outer surface of the second disk portion 152 of the third-stage carrier 150 that supports the shaft portion 141 of the revolving planetary gear 140, and the output shaft 153 has three stages. Decelerated rotation is transmitted.

(3) Drive transmission device using planetary gear mechanism The planetary gear mechanism 100 fixes one of rotation of the sun gear 120, revolution of the planetary gear 140 (rotation of the carrier 150), and rotation of the internal gear 130, one Connected to the input and one to the output.

"Example 1"
FIG. 8 is an exploded perspective view of a drive transmission device 200 using a multi-stage planetary gear mechanism 100.
The drive transmission device 200 includes an input shaft 110 penetrating the entire body, a sun gear 120 inserted through the input shaft 110, a carrier 150 that rotatably supports the planetary gear 140, and the planetary gear 140 meshingly protruding in the axial direction of the input shaft 110. This is a multi-stage planetary gear mechanism in which the planetary gear mechanism 100 composed of the internal gear 130 in which the convex portion 131a and the concave portion 131b fitted with the convex portion 131a are formed is overlapped in three stages.

  In the planetary gear mechanism 100 in which the three stages are overlapped, the cylindrical body 131 of the internal gear 130 is accommodated in the case body 210 via the partition plate 211, and the input side of the driving force is supported by the cover body 212. The output shaft 153 of the third stage carrier 150 protrudes from one end of the accommodated case body 101 and is connected to a driven part (not shown).

  In the drive transmission device 200 configured as described above, the rotational driving force input from one end of the input shaft 110 while the case body 210 is fixed is transmitted from the output shaft 153 to the driven portion while being decelerated.

"Example 2"
FIG. 9 is a partial cross-sectional perspective view of the geared motor 300 according to the present embodiment.
The geared motor 300 includes a motor 310 as a drive source, an input shaft 110 that fits the output shaft 311 of the motor 310 and receives the rotational driving force of the motor 310, the sun gear 120 inserted through the input shaft 110, and the planetary gear 140. The planetary gear mechanism 100 is composed of a rotation supporting carrier 150, a planetary gear 140 meshed with each other and a convex portion 131a protruding in the axial direction of the input shaft 110, and an internal gear 130 formed with a concave portion 131b fitted with the convex portion 131a. It is a motor with a reduction gear that is stacked and housed in the case body 320 as a unit.

  In the geared motor 300, the rotational driving force of the motor 310 is transmitted from the output shaft 311 to the input shaft 110, and is decelerated from the output shaft 153 of the planetary gear mechanism 100 to be output. The geared motor 300 can be used as a drive transmission device in which the overlaid planetary gear mechanism 100 is housed integrally in a case body 320 and the entire size is reduced.

"Example 3"
FIG. 10A is a perspective view of an external gear speed reduction mechanism 400 according to the present embodiment, and FIG.
In the external gear reduction mechanism 400, the internal gear 130 constituting the planetary gear mechanism 100 has external teeth 134 on the outer surface, and transmits reduced rotation to a driven body that meshes with the external teeth 134.

  In the external gear speed reduction mechanism 400, the rotational driving force input from one end of the input shaft 110 is reduced by the planetary gear mechanism 100, the internal gear 130 rotates while the output shaft 153 of the carrier 150 is fixed, and the internal gear The reduced speed rotation of the gear 130 is transmitted to the gear 135 that meshes with the external teeth 134 provided on the outer surface of the internal gear 130.

“Second Embodiment”
11 is a longitudinal sectional view of the planetary gear mechanism according to the present embodiment, FIG. 12 is a perspective view of the internal gear according to the present embodiment, FIG. 13 is a perspective view showing the form of the output element of the output shaft of the carrier, and FIG. (A) is a perspective view which shows an example of the planetary gear mechanism which concerns on this embodiment, (b) is a perspective view which shows an example of a case body.
Hereinafter, the configuration and operation of the planetary gear mechanism 100A will be described with reference to the drawings, but the same components as those of the planetary gear mechanism 100 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. To do.

(1) Planetary gear mechanism (1.1) Overall configuration of planetary gear mechanism FIG. 11 shows an example in which the planetary gear mechanism according to the present embodiment has a three-stage configuration. The gear mechanism can be superposed according to the required reduction ratio.

  As shown in FIG. 11 (in the drawing, the planetary gear 140A is shown in cross section in the lower side of the figure), the planetary gear mechanism 100A is rotated by receiving a driving force from the case body 110A and a driving source (not shown). Supporting the sun gear 120, the internal gear 130A disposed coaxially with the sun gear 120, the plurality of planetary gears 140A revolving while meshing with the sun gear 120 and the internal gear 130A, and the rotating shaft 141A of the planetary gear 140A. The carrier 150A is a rotating member that is rotated by the revolution of the planetary gear 140A.

(1.2) Internal gear As shown in FIGS. 12A and 12B, the internal gear 130A includes a cylindrical cylinder 131A having a hollow portion as a whole, and the center of the inner surface 132A of the cylinder 131A. It consists of 133A of internal teeth formed in the part.
Both sides of the inner surface 132A on which the inner teeth 133A are formed have a cylindrical shape, a first inner surface 132Aa having a large diameter that does not protrude beyond the tip circle of the inner teeth 133A, and a small diameter first protruding from the tip circle of the inner teeth 133A. It consists of two inner surfaces 132Ab, and peripheral portions 151Aa and 152Aa of a first disk portion 151A of a carrier 150A described later are in contact with each other to rotatably support the carrier 150A from the outside.

(1.3) Carrier The carrier 150A is an output element that is exposed in the drive transmission direction from the first disc portion 151A, the second disc portion 152A facing the first disc portion 151A, and the second disc portion 152A. The output shaft 153A is integrally formed.

  The first disc portion 151A has a larger-diameter flange shape than the second disc portion 152A, and the peripheral edge portion 151Aa abuts on the first inner surface 132Aa of the hollow portion of the internal gear 130A and is rotatably supported. The The second disc portion 152A has a smaller diameter than the tip circle of the internal tooth 133A of the internal gear 130A, and the peripheral portion 152Aa is a second portion of the hollow portion of the internal gear 130A in a state where the planetary gear 140A is incorporated. It abuts on the inner surface 132Ab and is rotatably supported (see FIG. 11).

As a result, the carrier 150A has a first inner surface 132Aa of the internal gear 130A together with the planetary gear 140A that revolves while rotating and meshing with the internal teeth 133A of the internal gear 130A without requiring a support shaft at the center of rotation. It rotates while being supported by the second inner surface 132Ab.
Therefore, the carrier 150A is rotationally supported at two points of the first inner surface 132Aa and the second inner surface 132Ab of the internal gear 130A that are separated from each other in the drive transmission direction, and does not require another rotational support structure such as a support shaft or a bearing. Rotational unevenness can be suppressed with a simple configuration.

An output shaft 153A for outputting the driving force exposed in the drive transmission direction is integrally formed on the outer surface of the second disc portion 152. Therefore, as compared with the planetary gear mechanism in which the carrier and the output shaft are configured as separate parts, it is possible to provide a simple and inexpensive planetary gear mechanism 100A by reducing components and suppressing assembly errors.
In the case where a plurality of stages are overlapped, the sun gear 120A is provided integrally with the second disk portion 152A as an output shaft, except for the carrier 150A arranged at the most downstream (final stage) in the drive transmission direction. ing.

  As shown in FIG. 13, the output shaft 153A is formed as an input element of a drive transmission mechanism that transmits the driving force of the carrier 150A to the driven body. Examples of the drive transmission mechanism include a gear transmission mechanism, a contact joint mechanism, and a non-contact joint mechanism.

When the drive transmission mechanism is a gear transmission mechanism, a gear 153Aa is formed on the output shaft 153A (see FIG. 13A).
When the drive transmission mechanism is a contact joint mechanism, a coupling 153Ab is formed on the output shaft 153A (see FIG. 13B).
When the drive transmission mechanism is a non-contact joint mechanism, a magnetic coupling 153Ac is formed on the output shaft 153A (see FIG. 13C).
Therefore, a plurality of drive transmission mechanisms can be selected.

  As shown in FIG. 14A, the case body 110A accommodates the internal gear 130A in a non-rotatable manner, and an output shaft 153A of the carrier 150A is provided on one end side which becomes the attachment surface 110Aa to the attached body. A bulging portion 111A penetrating the inside is formed so as to be exposed toward the outside of the case body 110A. As shown in FIG. 14B, a male screw 111Aa is formed on the outer surface of the bulging portion 111A. The male screw 111Aa is fastened to a female screw formed on an attached body to which the case body 110A is attached.

  As a result, when the case body 110A is attached to the attached body, the male screw 111Aa can be directly fastened to the attached body without providing a fastening portion for fastening on the attachment surface 110Aa. Inside, the bulging part 111A can be enlarged, and various output elements exposed to the outside from the bulging part 111A can be provided.

DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus 10 ... Control apparatus 20 ... Paper feeding apparatus 30 ... Photoconductor unit 40 ... Developing unit 50 ... Transfer unit 60 ... Fixing apparatus 100, 100A, 200 ... Planetary gear mechanism 110 ... Input shaft 110A ... Case body 120, 120A ... Sun gear 130, 130A ... Internal gear 131, 131A ... Cylindrical body 132, 132Aa, 132Ab ...・ Inner surface (cylinder)
133, 133A ... Internal teeth 134 ... External teeth 140, 140A ... Planetary gear 141 ... Shaft 141A ... Rotating shaft 150, 150A ... Carrier 151, 151A ... First circle Plate part 152, 152A ... 2nd disk part 153, 153A ... Output shaft 300 ... Geared motor 400 ... External tooth reduction mechanism

Claims (10)

A sun gear that rotates by receiving a driving force via an input shaft;
An internal gear provided on the inner surface of the cylindrical body and arranged coaxially with the sun gear;
A planetary gear that revolves while rotating in mesh with the sun gear and the internal gear;
A rotating member that supports the shaft of the planetary gear, and whose peripheral portion is in rotation contact with the inner surface of the cylindrical body and rotates around the input shaft by the revolution of the planetary gear,
A part of the rotating member and a side surface facing the input shaft direction of the internal teeth of the internal gear meshing with the planetary gear are arranged so as to overlap when viewed from the drive transmission direction.
A planetary gear mechanism characterized by that. A sun gear that rotates in response to a driving force;
An internal gear provided on the inner surface of the cylindrical body and arranged coaxially with the sun gear;
A planetary gear that revolves while rotating in mesh with the sun gear and the internal gear;
The peripheral portions of the disk portions that support the planetary gear shaft facing each other are arranged so as to face the side surfaces of the cylindrical body facing the input shaft direction, and are rotated by the revolution of the planetary gear. A rotating member that comprises:
A planetary gear mechanism characterized by that. The internal gear is composed of a plurality, and the peripheral edge portion is disposed so as to be sandwiched between side surfaces facing the input shaft direction of the adjacent internal gear.
The planetary gear mechanism according to claim 1 or 2 , wherein the planetary gear mechanism is provided. A sun gear that rotates in response to a driving force;
An internal gear provided on the inner surface of the cylindrical body and arranged coaxially with the sun gear;
A planetary gear that revolves while rotating in mesh with the sun gear and the internal gear;
The peripheral portions of the disk portions that face each other and support the shaft of the planetary gear are arranged so as to be sandwiched between the side surfaces facing the input shaft direction of the adjacent internal gear, and by the revolution of the planetary gear, A rotating member that rotates;
A case body in which the internal gear is housed in a non-rotatable manner,
A planetary gear mechanism characterized by that. The rotating member is integrally formed with a first disc portion, a second disc portion facing the first disc portion, and an output element that projects from the second disc portion in the drive transmission direction and outputs a driving force. ing,
The planetary gear mechanism according to any one of claims 2 to 4 , wherein the planetary gear mechanism is provided. The output element is an input element of any one of a gear-type transmission mechanism, a contact joint mechanism, and a non-contact joint mechanism that transmits a driving force of the rotating member to a driven body.
The planetary gear mechanism according to claim 5 , wherein: The case body has a bulging portion that penetrates the inside of the case body, and an external thread that is fastened to an attached body that attaches the case body to the outer surface of the bulging portion is formed.
The planetary gear mechanism according to claim 4 . The internal gear has a convex part and a concave part that fit between adjacent internal gears,
The planetary gear device according to any one of claims 1 to 7 , wherein A sun gear that rotates in response to a driving force;
An internal gear provided on the inner surface of the cylindrical body and arranged coaxially with the sun gear;
A planetary gear that revolves while rotating in mesh with the sun gear and the internal gear;
The shaft of the planetary gear is supported, and a part of the planetary gear is rotationally supported so as to overlap with a side surface of the cylindrical body facing the input shaft direction of the inner teeth when viewed from the drive transmission direction. A rotating member that rotates by the revolution of the planetary gear,
A case body in which the internal gear is housed in a non-rotatable manner,
A planetary gear mechanism characterized by that. A rotating body,
A drive source for driving the rotating body;
The planetary gear mechanism according to any one of claims 1 to 9 , wherein the rotational speed of the drive source is reduced and transmitted to the rotating body.
An image forming apparatus.

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