JPH11230166A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the baring function for a long time by turnably and loosely fitting a bearing inward of a bearing holding body around a rotary shaft, and providing an alignment and support means between the bearing holding body and a casing hole part to prevent damages caused by uneven touch. SOLUTION: A stirring roller 21 is held by an oil impregnated sintered bearing 22, a seal ring 23 is provided inside the bearing 22, and the developing agent is prevented from being leaked outside a device by a rubber tip part 23a. The bearing 22 and the seal ring 23 are fitted to a bearing holding body 24, and the holding body 24 is fitted to a bearing fitting hole 7c in a casing by interposing a rubber ring 25 as an elastic body fitted to the outer circumference. The bearing 22 is fitted in a loosely fitting condition, and turnably set between the fitting hole and an inner wall part 24a of the holding body 24. The prescribed clearance is provided in the fitting condition of the holding body 24 to the fitting hole 7c part, and freely set around an outer diameter part 24b of the holding body. Thus, a roller core part 21a and the bearing holding body 24 are elastically aligned by the rubber ring 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device for supporting a shaft member such as a shaft in the fields of various office machines and electronic equipment, and more specifically, to absorb or reduce a fluctuating load or overload applied to the shaft member. The present invention relates to a bearing device that can be used.

[0002]

2. Description of the Related Art Conventionally, as a shaft member, for example, a motor shaft is rotatably supported via a bearing. Most of the bearings used here include rolling bearings and sliding bearings. Generally, when high precision is required, a ball bearing or the like is used, and in other cases, a sleeve-type sintered oil-impregnated bearing or the like is used.

However, rolling bearings such as ball bearings are very costly, and it has been extremely difficult to reduce the cost of products using such bearings.

Although the sleeve type oil-impregnated bearing is inexpensive, the oil-impregnated sintered oil-impregnated bearing is required to have a lubricating oil leakage problem due to long-term use and a shape which cannot be easily obtained by a normal molding method. When a bearing is used as a bearing held by a bearing case and integrated by press-fitting, since the sintered bearing is a porous material, the press-fitting operation may adversely affect the inner diameter and roundness of the bearing. Further, the porous structure of the bearing is sealed by eyelashes, resulting in a decrease in lubrication performance.

[0005]

The rotating shaft is in sliding contact with the inner peripheral surface of the bearing of the bearing device. To smoothly rotate the rotating shaft, the outer peripheral surface of the rotating shaft and the inner peripheral surface of the bearing are in contact. , A minute clearance (gap) is secured. Due to this clearance, when the rotating shaft rotates, the rotating shaft may vibrate in a direction perpendicular to the center axis direction due to a change in load applied to the rotating shaft and imbalance, etc. As a result, the rotating shaft may One-sided contact occurs between the bearing and the bearing, causing seizure due to uneven wear or heat generation, and causing the rotation shaft to be stuck.

As described above, in a bearing using a conventional sintered oil-impregnated bearing, sufficient consideration has not been given to reliability in terms of manufacturing method, mounting method and the like.

SUMMARY OF THE INVENTION An object of the present invention is to provide a highly reliable bearing whose structure is simple and the manufacturing cost of the bearing is reduced.

[0008]

According to a first aspect of the present invention, there is provided a bearing device, comprising: a rotating shaft; a bearing for slidingly supporting the rotating shaft; a bearing holder for integrally holding the bearing; and the bearing holder. And a casing supporting the bearing so that the bearing is rotatable around the axis of the rotating shaft while maintaining the bearing held inside the bearing holder. The bearing holder is provided with alignment support means for aligning the bearing holder between an outer peripheral portion of the bearing holder and a mounting hole to the casing. The rotating shaft is rotatably supported by the casing via an annular elastic body attached along the outer peripheral surface of the sleeve portion of the body.

According to a second aspect of the present invention, in the first aspect, the bearing in which the variable load or the overload generated during the rotation of the rotary shaft is held inside the bearing holder is provided. It is characterized by absorbing or relaxing by freely rotating around the axis.

According to a third aspect of the present invention, in the bearing device according to the first aspect, the bearing holder includes an alignment support means formed between an outer peripheral portion of the bearing holder and a mounting portion to the casing. The outer peripheral surface of the sleeve part of the bearing holder is a cone surface,
The inner peripheral side of the mounting hole of the casing facing the conical surface is formed as a cylindrical surface.

According to a fourth aspect of the present invention, there is provided the bearing device according to the first aspect, wherein the vibration generated by the rotation of the rotation shaft or the rotation is provided by the annular elastic body attached along the outer peripheral surface of the sleeve portion of the bearing holder. Vibration from the shaft drive system transmitted via a shaft is prevented from being transmitted to the casing, and vibration and resonance of the casing are reduced.

According to a fifth aspect of the present invention, in the first aspect, the contents of the bearing housed in the interior of the bearing are provided by an annular elastic body attached along an outer peripheral surface of a sleeve portion of the bearing holder. It is characterized in that the holding body is prevented from leaking to the flange surface side.

According to a sixth aspect of the present invention, in the first aspect, the bearing holder is formed of a self-lubricating material.

According to a seventh aspect of the present invention, in the first aspect, the material hardness of the material forming the bearing holder is higher than the material hardness of the material forming the bearing.

According to an eighth aspect of the present invention, in the first aspect, the heat resistant temperature of the material forming the bearing holder is higher than the heat resistant temperature of the material forming the bearing.

According to a ninth aspect of the present invention, in the first aspect, the bearing holder is formed of a material having no affinity for lubricating oil contained in the bearing.

According to a tenth aspect of the present invention, in the first aspect, the bearing holder is formed of a thermosetting resin.

According to an eleventh aspect of the present invention, in the first aspect, the bearing held inside the bearing holder absorbs or reduces a fluctuating load or an overload generated during rotation of the rotary shaft. In order to freely rotate around the axis of the rotating shaft, the lubricating oil contained in the bearing and the self-lubricating property of the bearing holder are lubricated.

According to a twelfth aspect of the present invention, in the first aspect, the bearing holder masks the bearing to prevent leakage of lubricating oil contained in the bearing.

According to a thirteenth aspect of the present invention, in the first aspect, the axial length of the bearing is substantially half the axial length of the bearing holder, and a part of the through hole of the bearing holder. Is used as a storage space for the oil reservoir from the bearing and the contents that enter from inside the device.

According to a fourteenth aspect of the present invention, there is provided an electrophotographic developing apparatus including the bearing device according to the first aspect.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an image reading apparatus 10 according to the present invention will be described in more detail with reference to FIGS. A schematic configuration of a laser beam printer having a photoconductor is shown in FIG. In the figure, the laser beam output from the semiconductor laser 1 is:
The modulation is performed based on a record information signal from the document reading device 16 or a computer.

This laser beam is swept by the rotating polyhedron 2 and is imaged by the imaging lens 3 on the surface of the photoreceptor 5 via the mirror 4. The photoreceptor 5 is rotated in the direction of arrow A shown in the figure, and the surface is uniformly charged by the main charger 6, and then is exposed by the laser beam that scans in a direction substantially parallel to the rotation axis of the photoreceptor 5. .

As a result, an electrostatic latent image is formed on the surface of the photoreceptor 5, and this electrostatic latent image is developed with a toner supplied from the developing device 7 constructed according to the present invention to form a visible image. Become.

The visible image formed on the photosensitive member 5 is transferred from a transfer paper cassette 8 to a paper feed roller 9 and a registration roller 1.
The toner is charged by the transfer charger 11 on the transfer paper fed by the control unit 0. The transfer paper is peeled off from the surface of the photoconductor 5 by the peeling charger 12, and the fixing device 1
4 is carried.

The fixing device 14 fixes the toner image on the transfer paper, and thereafter the transfer paper is discharged onto a discharge tray 15.
On the other hand, the residual toner on the surface of the photoconductor 5 is collected from the surface of the photoconductor 5 by the cleaner 7.

FIG. 2 is a central sectional view of a developing device 7 having a bearing device according to the present invention. The developing device 7 includes a developing unit 7a and a toner hopper unit 7b, and includes a toner and a carrier. The component developer 17 is magnetically brush-developed on the photoreceptor by a magnet roller 18.

In order to compensate for the toner developed and consumed by the photoreceptor from the two-component developer 17, an appropriate replenishment signal is transmitted by a sensor 19 to a printer CPU (not shown). The drive is transmitted, and a fixed amount of toner is supplied to the developing unit 7a.

The stirring roller 21 is a magnet roller 1
The two-component developer 17 is constantly stirred during the developing operation so that the toner supplied from the toner supply roller 20 is uniformly dispersed in the developer.

(First Embodiment of the Present Invention) FIG. 3 is a sectional view of the developing unit 7a divided from each shaft. In the embodiment, the bearing configuration of the present invention is used at both ends (four places) of the stirring roller 21. FIG. 4 shows a detailed view of the bearing portion.

The stirring roller 21 is an insert-molded part composed of a core 21a and a resin 21b. Core 2
1a is a plating process (hard chrome plating, electroless nickel plating, etc.) on free-cutting steel such as SUM24L, and the exposed both ends are Rmax 0.8 to 2.5 by surface finishing.
Finished to a surface roughness of μm.

As shown in FIG. 4, the shaft holding means of the stirring roller 21 is held by a copper-based oil-impregnated sintered bearing 22, and a shaft seal type developer leakage prevention seal is provided inside the sintered bearing 22 (developer side). Ring (nitrile rubber, fluorine rubber, etc.)
23 is provided, and the rubber tip 23a prevents the developer from leaking out of the apparatus.

Oil-impregnated sintered bearing 22 and seal ring 23
Is mounted on the bearing holder 24 and the bearing holder 24
Is an elastic body (silicone rubber ring) 2
Bearing mounting hole 7 provided in the casing with
The agitation roller 21 is accurately arranged on the developing unit 7 by being mounted on the developing unit 7.

The oil-impregnated sintered bearing 22 is mounted in a loosely fitted state with a maximum clearance of 0.05 mm on a mounting tolerance, and is set to be rotatable with the inner wall 24 a of the bearing holder 24. On the other hand, the fitting state between the bearing holder 24 and the bearing mounting hole 7c is 0.05 to 0.2 mm except for the step portion on the outer periphery of the bearing holder 24 and the housing 7d.
And the bearing case 24 is elastically aligned by the rubber ring 25 against the deflection of the core 21a and the distortion of the casing due to being set to be movable around the portion 24b. The coaxiality between the seal ring 23 and the core 21a is always ensured.

(Second Embodiment of the Present Invention) In the bearing device according to one embodiment of the present invention, loose fitting is set between the sintered bearing 22 and the inner wall 24a of the bearing holder 24 as described above. ing. For example, the outer diameter and tolerance of the sintered bearing 22 are set to φ9
(Tolerance: -0.02 to +0.00) and the bearing holder 24
Φ9 (tolerance +0.00)
To +0.03).

In the normal use state, the seal ring 23 slides between the seal tip portion 23a of the seal ring 23 and the core metal portion 21a having a smaller resistance.
By sliding between the sintered bearing 22 and the bearing holder 24 when the starting load is increased due to, for example, sticking between the metal core 21a and the like,
The stress on the seal tip 23a is suddenly reduced,
It is configured to maintain a good sealing state.

(Third Embodiment of the Invention) In the bearing device according to the first embodiment, as shown in FIG.
e is a cylindrical shape, and the outer diameter portion 24 of the opposing bearing holder 24
b has a conical shape.

FIG. 6 shows the change in torque of the stirring roller by an acceleration test, and the shape of the bearing holder was examined. Condition 1 is that the outer diameter portion 24b of the bearing holder 24 is cylindrical, the clearance with the casing hole 7e is set to 0.2 mm,
Condition 2 is that the clearance with the casing hole 7e is 0.05 mm at the root 24c and 0.2 mm at the tip 24d. As acceleration conditions, the number of rotations was 1.5 times that of normal use,
Under the intermittent driving condition of 10 seconds ON and 3 seconds OFF, the driving torque was measured every 120 hours.

As a result, in the case of the condition 1, an increase in the torque was confirmed after the 20th day, but in the case of the condition 2, a slight increase in the torque was observed, but the torque increased within a substantially constant range. In the case of Condition 1, the developer is wrapped around the rubber ring 25 mounted near the base 24c of the bearing holder, the elastic fitting is lost, and the developer is oil-impregnated from the seal tip 23a. It was presumed that they had entered the coupling bearing 22 side.

By adopting the configuration of Condition 2, the rubber ring 2
There was no wraparound of the developer in 5 parts, and little aggregation of the developer in the clearance section, and a good alignment effect was obtained.

(Fourth Embodiment of the Invention) In the bearing device according to the first embodiment, the rubber ring 25 mounted on the bearing holder 24 is made of silicon rubber and has a hardness Hs (JI).
SA) 41 is adopted. The fitting and fitting state is such that the crushing margin of the rubber ring 25 is set to 0.3 mm, the rotation is stopped in the radial direction at the outer diameter portion of the casing hole 7d, the elastic fitting is performed, and the developer from the outer periphery of the bearing holder 24 is provided. Also serves as leak prevention.

(Fifth Embodiment of the Present Invention) In the bearing device according to the first embodiment, the material of the bearing holder 24 is a thermosetting resin (a phenol resin or the like). The physical property table of the phenol resin is shown. In general, the oil-impregnated sintered bearing 22 is excellent in heat deformation and surface hardness.
The selection is made in consideration of the slip with the side.

[0043]

[Table 1]

(Sixth Embodiment of the Present Invention) In the bearing device according to the first embodiment, the oil-impregnated sintered bearing 22 uses copper-based oil-impregnated sintered having a surface hardness lower than that of the phenolic resin. When the developer leaks due to some cause (defect), damage can be minimized (replacement of the oil-impregnated sintered bearing 22).

(Seventh Embodiment of the Invention) In the bearing device according to the first embodiment, the continuous use heat resistance of the bearing case is higher than that of the bearing.
° C, the bearing case 24 (phenolic resin)
Is 100 to 120 ° C. to prevent effects on the seal ring 23 press-fitted into the bearing case 24, such as a decrease in press-in force and a change in coaxiality with the bearing.

(Eighth Embodiment of the Invention) In the bearing device according to the first embodiment, since the bearing case 24 (phenol resin) has no affinity for the lubricating oil contained in the oil-impregnated sintered bearing 22, oil-impregnated The lubrication of the inner and outer diameters of the coupling bearing 22 is maintained in a stable state for a long time.

(Ninth Embodiment of the Present Invention) In the bearing device according to the first embodiment, the oil-impregnated sintered bearing 22 is used to absorb or reduce a fluctuating load or overload generated during rotation of the core 21a. When freely rotating around the axis of 21a, the lubricating oil contained in the oil-impregnated sintered bearing 22 and the self-lubricating property of the bearing case 24 lubricate the bearing device so that an excessive load is imposed on the bearing device. In addition, smooth drive transmission is performed, and the life of the bearing device can be extended.

(Tenth Embodiment of the Present Invention) In the bearing device according to the first embodiment, the oil-impregnated sintered bearing 22 is rotated around the axis of the metal core 21a while being held inside the bearing case 24. As the outer peripheral surface of the oil-impregnated sintered bearing 22 slides with the inner peripheral surface of the bearing case 24, the porous structure of the outer surface of the oil-impregnated sintered bearing 22 is slightly sealed and masked. Unnecessarily oil-impregnated sintered bearing 22 from part
Can be prevented from flowing out, and the durability of the oil-impregnated sintered bearing 22 is improved.

As a result, the oil pressure of the inner peripheral sliding portion of the oil-impregnated sintered bearing 22 is forcibly prevented from dropping, and the clearance between the oil-impregnated sintered bearing 22 and the metal core 21a is sufficiently filled. Lubricating oil can be supplied.

(Eleventh Embodiment of the Invention) In the bearing device according to the first embodiment, the axial length of the oil-impregnated sintered bearing 22 is substantially half (1/2) of the axial length of the bearing case 24. And a part of the through hole of the bearing case 24 is
A storage space 26 is provided for the oil sump 2 and the contents that enter from the inside of the apparatus.

[0051]

According to the bearing device of the first aspect, the rotating shaft, the bearing that slides and supports the rotating shaft, the bearing holder that integrally holds the bearing, and the bearing holder that supports the bearing. The bearing is loosely fitted so as to be rotatable around the axis of the rotating shaft while maintaining the state in which the bearing is held inside the bearing holder. The holder has alignment support means for alignment formed between the outer peripheral portion of the bearing holder and a mounting hole to the casing, and is mounted along the outer peripheral surface of the sleeve portion of the bearing holder. Since the rotating shaft is rotatably supported by being elastically supported by the casing with the annular elastic body interposed therebetween, the inner peripheral surface of the bearing always comes into sliding contact with the shaft member such as the rotating shaft. Therefore, the clearance between the rotating shaft and the bearing can be suppressed. That.

Therefore, it is possible to prevent the rotation shaft from being caused by the clearance and the accompanying vibration. In addition, since the bearing has a sufficient centering function, the function as a bearing that suffers from damage due to one-sided contact is maintained for a long time.

Further, the bearing is loosely fitted so as to be rotatable around the axis of the rotating shaft while maintaining the state in which the bearing is held inside the bearing holding body. This eliminates the problems associated with press-fitting, such as changes in the inner diameter of the bearing, loss of roundness, and reduced lubricity due to crushing of the porous structure, which occur when press-fitting into the body. , Mounting accuracy is improved.

According to the bearing device of the second aspect, the bearing in which the load fluctuation or overload generated during rotation of the rotary shaft is held inside the bearing holder is the shaft of the rotary shaft. The inner circumference of the bearing is always in sliding contact with the shaft member, such as the rotating shaft, so that the clearance between the rotating shaft and the bearing can be suppressed. Can be. For this reason, it is possible to prevent the rotation shaft from oscillating due to the clearance and the accompanying vibration.

According to a third aspect of the present invention, in the first aspect, the bearing holder is provided with the alignment support means formed between an outer peripheral portion of the bearing holder and a mounting portion to the casing. , The outer peripheral surface of the sleeve portion of the bearing holder is a conical surface,
By forming the inner peripheral side of the mounting hole portion of the casing facing the conical surface as a cylindrical surface, it has a centering function, so that the bearing function is maintained for a long time without damage due to one-side contact.

If the inner peripheral side of the mounting hole of the casing facing the cylindrical surface is also a cylindrical surface with respect to the cylindrical surface forming the outer peripheral surface of the sleeve portion of the bearing holder, the cylindrical surfaces contact each other, so that the bearing support rigidity is reduced. Alignment function is deteriorated due to excessive force, bearing load cannot be shared evenly, and one-sided contact occurs, resulting in poor long-term reliability. Because of the contact, the bearing together with the bearing holder can be inclined by a slight angle with respect to the rotating shaft against sudden load fluctuation or impact force, so that stable sliding characteristics can be obtained.

According to the bearing device of the fourth aspect, the vibration or rotation generated by the rotation of the rotating shaft is caused by the annular elastic body attached along the outer peripheral surface of the sleeve portion of the bearing holder in the first aspect. Since the vibration from the shaft drive system transmitted through the shaft can be prevented from being transmitted to the casing, the vibration and resonance of the casing can be reduced.

Further, since the elastic body is interposed between the bearing holder and the casing, the impact force can be absorbed even with a high rigidity support, so that the bearing is not damaged. Further, since the bearing together with the bearing holder can be inclined by a slight angle with respect to the rotating shaft, a lubricating oil film is formed on the sliding surface of the bearing by a wedge effect, and stable sliding characteristics can be obtained.

According to the bearing device of the fifth aspect, in the first aspect, the annular elastic body attached along the outer peripheral surface of the sleeve portion of the bearing holder holds the content of the contents housed inside the device. Since the configuration is such that leakage of the bearing holder to the flange surface side is prevented, contamination of the surroundings due to leakage of the contents can be prevented.

According to the bearing device of the sixth aspect, in the first aspect, since the bearing holder is formed of a material having self-lubricating properties, when the bearing rotates around the axis of the rotating shaft, , Resulting in smooth rotation.

According to the bearing device of the present invention, since the bearing holder is made of a material having a material hardness higher than that of the bearing material in the first embodiment, even if a problem such as leakage of the developer occurs. If only the bearings are replaced, damage can be minimized.

According to the bearing device of the eighth aspect, in the first aspect, the bearing holder is formed of a material having a higher heat-resistant temperature than the material of the bearing. Prevent changes in coaxiality.

According to the bearing device of the ninth aspect, in the first aspect, since the bearing holder is formed of a material having no affinity for the lubricating oil contained in the bearing, lubrication is performed from the outer peripheral surface of the bearing. Even if oil oozes out, there is no problem such as unnecessary absorption of oil leakage on the bearing holder side, which may cause a decrease in lubricity or a component of the lubricating oil damaging the holding part of the bearing holder. .

Further, when a material having no affinity for the lubricating oil is used, an oil-repellent material which may accelerate the oozing of the lubricating oil is not required depending on the combination with the lubricating oil contained in the bearing. It is advantageous.

According to the tenth aspect of the present invention, since the bearing holder is made of a thermosetting resin in the first aspect, the mechanical properties such as self-lubricating properties, wear properties, heat resistance, etc., and chemical substances are used. Therefore, a high-performance bearing device can be obtained at low cost. Further, the use of a resin material is more effective in preventing lubricating oil from flowing out than using a metal material.

According to the eleventh aspect of the present invention, in the first aspect, the bearing held inside the bearing holder absorbs or reduces a load variation or an overload generated during rotation of the rotating shaft. When rotating around the rotation axis as much as possible, the lubricating oil component contained in the bearing and the self-lubricating property of the material forming the bearing holder provide smooth rotation.

According to the bearing device of the twelfth aspect, in the first aspect, the bearing is configured to rotate around the rotating shaft while being held inside the bearing holder, so that the outer peripheral surface of the bearing is provided. Slides on the inner peripheral surface of the bearing holder, whereby the porous structure on the outer peripheral surface of the bearing is slightly sealed and masked, so that the lubricating oil contained in the bearing flows out of this part unnecessarily. Can be prevented, and the durability of the bearing is improved.

As a result, it is possible to supply a sufficient amount of lubricating oil to completely fill the clearance between the bearing and the rotary shaft by forcibly preventing a decrease in the oil pressure of the inner peripheral sliding portion of the bearing.

According to a thirteenth aspect of the present invention, in the first aspect, a part of the through hole for fitting the shaft member into the bearing holder is formed by the lubricating oil component of the bearing and the inside of the device. Since it is configured to be used as a storage part for contents that enter the interior, it is possible to prevent the leakage of the lubricating oil component and the surrounding contamination due to leakage of the contents.

According to the bearing device of the fourteenth aspect, if the bearing device of the first aspect is applied to a bearing device such as a stirring shaft of an electrophotographic developing device, the inner peripheral surface of the bearing is always a shaft such as a rotating shaft. Since it comes into sliding contact with the member, the clearance between the rotating shaft and the bearing can be suppressed.

Therefore, it is possible to prevent the rotation shaft from oscillating due to the clearance and the accompanying vibration. Further, since it has a sufficient centering function, the function as a bearing is maintained for a long time without damage due to one side contact.

Further, since the press-fitting step of the bearing component is not required, the dimensional control of the bearing component and the reduction of the assembly cost can be achieved, and an inexpensive developing device can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a laser beam printer using a developing device equipped with a bearing device according to an embodiment of the present invention.

FIG. 2 is a central sectional view of a developing device equipped with a bearing device according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of the developing unit according to the embodiment of the present invention, which is divided from each shaft portion.

FIG. 4 is a detailed view of a bearing unit in one embodiment according to the present invention.

FIG. 5 is a detailed view of a bearing unit according to one embodiment of the present invention.

FIG. 6 is a diagram showing a durability test result of a rotating shaft using a bearing device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Semiconductor laser 2 Rotating polyhedron 3 Imaging lens 4 Mirror 5 Photoreceptor 6 Main charger 7 Developing unit 7a Developing unit 7b Toner hopper unit 7c Bearing mounting hole 7d Casing 7e Casing hole 8 Transfer paper cassette 9 Feed roller 10 Registration roller REFERENCE SIGNS LIST 11 transfer charger 12 peeling charger 13 transport belt 14 fixing device 15 paper discharge tray 16 cleaner 17 two-component developer 18 magnet roller 19 sensor 20 toner supply roller 21 stirring roller 21a stirring roller core 21b stirring roller resin portion 22 sintering Oil-impregnated bearing 23 Developer leakage prevention seal ring 23a Seal tip 24 Bearing holder 24a Bearing holder inner wall 24b Bearing holder outer diameter part 24c Bearing holder root 24d Bearing holder tip 25 Elastic body (rubber ring) 2 Storage space

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Jun Yamaguchi 22-22 Nagaikecho, Abeno-ku, Osaka City, Osaka Inside (72) Inventor Yu Wakabayashi 22-22 Nagaikecho, Abeno-ku, Osaka City, Osaka (72) Inventor: Tomohiko Kimura 22-22 Nagaikecho, Abeno-ku, Osaka, Osaka

Claims (14)

[Claims] 1. A bearing device comprising: a rotating shaft; a bearing that slides and supports the rotating shaft; a bearing holder that integrally holds the bearing; and a casing that supports the bearing holder. The bearing is loosely fitted so as to be rotatable around the axis of the rotating shaft while keeping the bearing held inside the bearing holder, and the bearing holder is An annular support provided along an outer circumferential surface of a sleeve portion of the bearing holder, the aligning support means being provided between the outer peripheral portion of the bearing holder and the mounting hole for the casing; A bearing device elastically supported by the casing with the elastic body interposed therebetween to rotatably support the rotating shaft. 2. A variable load or overload generated during rotation of the rotary shaft is absorbed by the bearing held inside the bearing holder by freely rotating around the axis of the rotary shaft. The bearing device according to claim 1, wherein the bearing device is relaxed. 3. The centering support means, wherein the bearing holder is formed between an outer peripheral portion of the bearing holder and a mounting portion to the casing, and an outer peripheral surface of a sleeve portion of the bearing holder is a conical surface. The bearing device according to claim 1, wherein an inner peripheral side of the mounting hole portion of the casing facing the conical surface is formed as a cylindrical surface. 4. A vibration generated by rotation of the rotation shaft or a shaft drive system transmitted through the rotation shaft by an annular elastic body attached along a sleeve portion outer peripheral surface of the bearing holder. The bearing device according to claim 1, wherein vibration is prevented from being transmitted to the casing, and vibration and resonance of the casing are reduced. 5. An annular elastic body attached along the outer peripheral surface of the sleeve portion of the bearing holder prevents leakage of contents contained in the device to the flange surface side of the bearing holder. The bearing device according to claim 1, wherein: 6. The bearing device according to claim 1, wherein the bearing holder is formed of a material having a self-lubricating property. 7. The bearing device according to claim 1, wherein a material hardness of a material forming the bearing holder is higher than a material hardness of a material forming the bearing. 8. The bearing device according to claim 1, wherein a heat-resistant temperature of a material forming the bearing holder is higher than a heat-resistant temperature of a material forming the bearing. 9. The bearing device according to claim 1, wherein the bearing holder is formed of a material having no affinity for lubricating oil contained in the bearing. 10. The bearing device according to claim 1, wherein the bearing holder is formed of a thermosetting resin. 11. The bearing held inside the bearing holder rotates freely around the axis of the rotary shaft to absorb or reduce a fluctuating load or overload generated during rotation of the rotary shaft. When moving, lubricating oil contained in the bearing,
The bearing device according to claim 1, wherein the bearing device is lubricated by the self-lubricating property of the bearing holder. 12. The bearing device according to claim 1, wherein the bearing holder masks the bearing to prevent leakage of lubricating oil contained in the bearing. 13. The bearing according to claim 1, wherein the axial length of the bearing is substantially half the axial length of the bearing holder, and a part of the through hole of the bearing holder intrudes from the oil reservoir from the bearing and the inside of the device. The bearing device according to claim 1, wherein the bearing device is used as a storage space for incoming contents. 14. An electrophotographic developing apparatus comprising the bearing device according to claim 1.