JP2004263754A - Bearing device and rotary drive device - Google Patents

Abstract

A bearing device and a rotary drive device using the same achieve high reliability and long life.
The bearing device includes a radial bearing means for receiving a radial load applied to a shaft and a thrust bearing means for receiving a thrust load. Then, a lubricating oil seal member 8 disposed between the shaft 2 and the air gap G and a resin housing member 10 for holding the seal member 8 from the outer periphery are provided. By holding each member with the housing member 10 formed by outsert molding with respect to the seal member 8 and the bearing means 3, a structure that does not cause a gap that causes leakage of lubricating oil is formed. In addition, the formation accuracy of the gap G can be sufficiently ensured.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technology for improving stability and reliability in a bearing device and a rotary drive device using the same.
[0002]
[Prior art]
Used as a long-life bearing device that supports the rotating shaft with high precision, for example, a bearing unit for a cooling fan provided in a heat-generating device such as a CPU (central processing unit), and a recording / reproducing device using a tape-shaped recording medium. There is known a bearing unit of a fan motor for driving a rotating drum, and a configuration using a hydrodynamic bearing is known (for example, see Patent Document 1).
[0003]
As the configuration of the bearing unit, for example, a radial bearing using a sintered impregnated bearing, a hydrodynamic bearing, or a thrust bearing made of a polymer material is used as a bearing means for supporting a metal (stainless steel or the like) shaft. In such a case, an example is provided in which a metal (brass or the like) housing member that holds the bearings and a seal member are provided to suppress leakage of lubricating oil filled in the inner peripheral portion of the radial bearing. In this embodiment, the shaft is rotatably supported by the radial bearing and the thrust bearing, and the shaft is rotated relatively to the housing member. Further, lubricating oil is essential for satisfactory rotation of the shaft, and the sealing member prevents the lubricating oil from leaking to the outside. However, the lubricating oil may ooze out of all the gaps and leak to the outside of the bearing unit, which may shorten the life of the bearing unit. Therefore, the fastening portion of each member must be completely sealed. A method of sealing a fastening portion between a metal housing member and a seal member with an ultraviolet-curing adhesive or the like, or a method of integrally forming a seal member using a housing member made of resin (for example, (See Japanese Patent Application No. 2001-289568 and Japanese Patent Application No. 2002-034331) which have already been submitted.
[0004]
[Patent Document 1]
JP-A-2000-205243 (FIGS. 1 to 4)
[0005]
[Problems to be solved by the invention]
However, the conventional bearing device has the following problems in terms of stability and reliability.
[0006]
For example, in a configuration in which the housing member and the seal member are separate members, it is difficult to completely connect and fasten the two, and it is difficult to reliably prevent leakage of lubricating oil. In addition, it is a complicated and difficult task to apply a polymer packing material such as an adhesive evenly over the entire circumference of the fastening part, and confirm that the sealing material is completely sealed without any gaps. It is also difficult to do. As a result, sufficient reliability cannot be obtained or the cost is very high.
[0007]
The leakage of the lubricating oil leads to a failure to ensure a stable life and causes a reduction in the reliability of the bearing unit, and also has an adverse effect on components disposed outside the bearing unit (such as a chemical attack phenomenon). ) May be caused. For example, in application to a hard disk drive (HDD) device, leakage of lubricating oil made of an organic material causes stiction, haze (fogging of a disk surface), and the like.
[0008]
Further, in the configuration in which the housing member and the seal member are integrally formed, there is no gap between them, but when the housing member is formed in a state where the shaft is supported by the bearing, the seal portion which is a part of the housing member is formed. If it is necessary to reduce the gap formed between the shaft and the shaft, it is difficult to guarantee the accuracy. For example, since the variation in the amount of the gap between the seal portion and the shaft affects the position (height) of the oil surface, if the amount of oil is large, the lubricating oil may be scattered to the outside due to a temperature rise or a pressure change. is there.
[0009]
Therefore, an object of the present invention is to achieve high reliability and long life in a bearing device and a rotary drive device using the same.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a member for lubricating oil seal disposed with a gap between the shaft and a resin housing member for holding the member and bearing means from the outer periphery. It is something.
[0011]
Therefore, according to the present invention, a structure (seamless structure) in which both members are joined together without any gap can be realized by holding the sealing member from the outer periphery with the resin housing member. Therefore, it is not necessary to seal the gap between the sealing member and the housing member with an adhesive or the like. In addition, the amount of the gap between the sealing member and the shaft is guaranteed by the processing accuracy and the molding accuracy of the member (that is, it is not affected by the molding accuracy of the housing member), so that the variation in the gap is sufficiently reduced. be able to.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention relates to a bearing device and a rotary drive device using the same.For example, in a configuration using a hydrodynamic bearing or the like, it is possible to prevent leakage of lubricating oil due to shock, environmental change, etc. It is suitable for various devices that require highly accurate shaft support.
[0013]
First, a configuration of a bearing device according to the present invention will be described with reference to FIGS.
[0014]
In the embodiment described below, radial bearing means and thrust bearing means are provided as bearing means for supporting a shaft (rotating shaft). For the thrust bearing means at the shaft end, a pivot type bearing is used. The illustrated configuration (first embodiment) and the configuration using a hydrodynamic bearing (second embodiment) are illustrated.
[0015]
FIG. 1 is a cross-sectional view illustrating a configuration example of a bearing device (or a bearing unit) according to the first embodiment. In this example, the tip of the shaft is processed into a spherical portion, and the portion is received by a member formed of a polymer material to constitute a thrust bearing means.
[0016]
The bearing device 1 includes a shaft (rotating shaft) 2 formed in a round bar shape from a metal material such as stainless steel or a resin material or the like, and bearing means 3 for supporting the shaft. That is, as the bearing means 3, a radial bearing means 4 for receiving a radial load and a thrust bearing means 5 for receiving a thrust load are provided.
[0017]
As the radial bearing means 4 that rotatably supports the shaft 2 in the radial direction, a sintered oil-impregnated bearing, a hydrodynamic bearing, or the like is used. As an example, a case where a hydrodynamic bearing is used will be described. For example, the bearing is formed of a copper-based or copper-iron-based sintered metal in a groove for generating a dynamic pressure (a so-called herring which has a "-" shape). Bone groove) is formed, and the lubricating oil is held by using a porous structure peculiar to the sintered metal. In this example, two groups of dynamic pressure generating grooves 4a, 4a, ... and 4b, 4b, ... are formed in the inner peripheral portion of the cylindrical radial bearing means 4 in the circumferential direction (the direction along the shaft rotation). Although a hydrodynamic bearing is used, a configuration in which a groove for generating dynamic pressure is formed on the peripheral surface of the shaft 2 may be used. Further, the application of the present invention is not limited to the hydrodynamic bearing, and it is of course possible to implement the invention in various forms using a metal bearing or the like.
[0018]
An annular engagement groove 2a is formed at a position near the tip of the shaft 2, and an annular stopper (for) member 6 is attached to this. The retaining member is made of, for example, a polymer material such as nylon (linear aliphatic polyamide) or a metal component (such as an E-ring), and an external force is applied in the axial direction by vibration or the like, or a pressure change occurs. In the event that such a situation occurs, the shaft 2 functions as a stopper that prevents the shaft 2 from moving in the direction of the center axis and coming off.
[0019]
Around the retaining member 6, a member (hereinafter, referred to as a "space forming member") 7 formed using a polymer material such as nylon, polyimide, and liquid crystal polymer (LCP) or a metal such as brass is provided. Has been. The space forming member 7 is arranged to form a predetermined space around the stopper member 6 in consideration of the fact that the stopper member 6 is fixed to the shaft 2 and rotates together.
[0020]
In this example, the resin-made space forming member 7 is formed in a cylindrical shape with a bottom having a concave portion 7a, and the end surface of the shaft 2 is formed into a spherical shape and is point-contacted with the bottom surface (flat surface) of the concave portion 7a. ing. As described above, with respect to the thrust bearing means 5 for supporting the shaft 2 in the thrust direction, for example, by adopting a form in which a convex curved surface is formed on the shaft end 2b and this is brought into contact with the space forming member 7, Since a receiving member for receiving the end is not required (the space forming member 7 also serves as the receiving member), it is preferable from the viewpoints of simplification of the configuration, reduction of the number of parts and cost. Further, the present invention is not limited to this example, and it is of course possible to implement in various forms such that a protrusion (or a receiving portion) is formed integrally with the space forming member and this is brought into contact with the shaft end.
[0021]
The space forming member 7 shown in this example is provided with a stepped portion 7b, which constitutes a receiving recess into which the radial bearing means 4 is partially fitted (the reason is as follows). This will be described in a manufacturing method described later.)
[0022]
A lubricating oil sealing member (hereinafter referred to as a “seal member”) 8 has a minute gap “G” formed between its inner peripheral surface 8a and the shaft 2 (formed radially on the exposed side of the shaft 2). (A void), and is formed in a cylindrical shape using a resin material, for example, a polymer material such as nylon or polytetrafluoroethylene, or a metal. The seal member 8 is formed with a step 8b, which forms a receiving recess into which the radial bearing means 4 is partially fitted (the reason will be explained in a later-described manufacturing method). Yes.) Note that a part 9 of the lubricating oil filled in the device exists in the gap G (see the large circle in FIG. 1). The depression 8c formed in the seal member 8 is formed corresponding to a protrusion formed at the end of the radial bearing means 4, and the protrusion is a mark for distinguishing the direction in the axial direction. (Mark).
[0023]
The housing member (or holding member) 10 holds the seal member 8 and the radial bearing means 4 and the like from the outer periphery, and is formed using a resin material (for example, a polymer material such as polyimide, polyamide, nylon, or LCP). Is done. In this example, the housing member 10 has a role of completely and seamlessly fastening the radial bearing means 4, the space forming member 7, and the seal member 8 without any gap. Thereby, leakage of the lubricating oil can be prevented.
[0024]
Further, in this example, a device for preventing leakage of the lubricating oil in a portion where the shaft 2 is exposed to the outside is devised.
[0025]
That is, as shown enlarged in the great circle of FIG. 1, in the vicinity of the place where the shaft 2 is exposed to the outside, the portion forming the gap G between the shaft 2 and the seal member 8 has a tapered portion (a truncated cone shape). 2c), and is formed so that the shaft diameter increases as it proceeds inward (in a direction approaching the radial bearing means 4) along the shaft 2.
[0026]
Since the gap G is formed between the tapered portion 2c having a gradually increasing diameter toward the inside and the inner peripheral surface 8a of the seal member 8 opposed thereto, the gap (gap amount) increases toward the inside of the device. It becomes smaller gradually. When the drawing pressure caused by the capillary action is described as “p”, there is a relationship of “p = 2γ cos θ / c” (where, γ: surface tension of lubricating oil, θ: contact angle of lubricating oil, c: void amount). , P is inversely proportional to the void amount c (p∝1 / c). Therefore, the smaller the gap amount c, the greater the generated retraction pressure, and the more the lubricating oil 9 is drawn into the inner direction with the smaller gap amount c, so that the lubricating oil 9 moves to the outside and leaks. Never. In addition, when the shaft diameter is constant, a portion having a small gap amount and a portion having a large gap portion are generated due to eccentricity when viewed from the axial direction, and the lubricating oil is biased toward the portion having a small gap amount. When formed, the gap amount is varied along the axial direction, and the same clearance portion exists in the cut surface (elliptical surface) inclined with respect to the axis, which is caused by eccentricity. The bias of the lubricating oil is reduced. And, by the action of the centrifugal force at the time of rotation of the shaft, a sealing effect of making it difficult for the lubricating oil to scatter outside can be obtained.
[0027]
Further, in order to prevent leakage of the lubricating oil, a method of applying a surfactant to the exposed portion of the shaft 2 and the surface of the seal member 8 may be used. By applying the surfactant, the contact angle θ with the lubricating oil increases, and as a result, the drawing pressure p decreases. That is, since the internal suction pressure p is relatively increased by weakening the external suction pressure p, leakage and movement of the lubricating oil can be prevented.
[0028]
Next, a method for manufacturing the bearing device according to the present invention will be described with reference to FIG. This drawing is a process diagram showing an example of an assembling process of the bearing device 1, and the bearing device is manufactured according to the following process.
[0029]
(1) Shaft insertion process (2) Mounting process of space forming member and seal member (3) Housing member forming process (4) Lubricating oil filling and oil amount adjusting process.
[0030]
First, in the step (1), the shaft 2 to which the retaining member 6 is attached is inserted into the radial bearing means 4. Then, in step (2), the space forming member 7 and the seal member 8 are attached to the radial bearing means 4. That is, a step 7b of the space forming member 7 and a step 8b of the sealing member 8 are fitted around the outer peripheral edge of each end in the axial direction of the radial bearing means 4, so that a part of the radial bearing means 4 is formed. The space is formed in the recesses of the space forming member 7 and the seal member 8. At the end of this step, the shaft 2 is already rotatably supported by the bearing means 3.
[0031]
In the next step (3), the housing member 10 is formed by outsert molding using a polymer material such as nylon.
[0032]
Thereafter, in step (4), lubricating oil is filled into the apparatus by vacuum impregnation to adjust the amount of oil (for example, an excess amount of oil that is exposed to the outside due to thermal expansion under a predetermined temperature condition is removed).
[0033]
In the bearing device 1 thus manufactured, a plurality of members (the radial bearing means 4, the space forming member 7, and the seal member 8) can be seamlessly fastened by outsert molding of the housing member 10, so that a gap between the members is provided. And leakage of the lubricating oil can be completely prevented. Further, there is no need to manage the packing applied to the fastening portion as in the related art, and the process management is simplified.
[0034]
In the above step (2), the seal member 8 may be formed. However, if the gap between the seal member and the shaft is small, as described above, the A method of attaching to the bearing means 4 is preferable. The reason is to sufficiently guarantee the accuracy of the gap. For example, if the void amount c is larger than the allowable value, the drawing pressure p due to the capillary force becomes too small, and thus the void amount has an upper limit. Therefore, when it is necessary to increase the oil amount, it is necessary to increase the length of the gap G in the axial direction (the thickness of the inner peripheral portion of the seal member). As a result, the mold portion for forming the gap G has a thin and long shape in the axial direction, which makes it difficult to manufacture the mold technically. Alternatively, when sufficient molding accuracy cannot be obtained, the variation in the amount of voids increases. Therefore, if the sealing member is formed before the step (2), the accuracy can be sufficiently ensured, and the accuracy of the gap is guaranteed. In addition, since the impact resistance is inversely proportional to the square of the void amount c, reducing the void amount and reducing its variation leads to prevention of scattering of the lubricating oil due to the impact (however, if the void amount becomes small, Note that the amount of change in the position of the oil surface increases due to thermal expansion due to temperature rise.)
[0035]
Since the space forming member constituting the bearing device is not limited to a resin material, for example, a metal material can be used, and FIG. 3 shows a configuration example.
[0036]
The illustrated bearing device 1A is different from the above-described bearing device 1 in the following points (therefore, the description of other portions is omitted by using the same reference numerals as those assigned to the portions in the bearing device 1). Yes.)
[0037]
The space forming member 7A is formed of, for example, stainless steel, brass, a pressed material, a sintered material, or the like.
[0038]
The thrust bearing means 5A has a thrust bearing member 11 for receiving the spherically shaped shaft end 2b, and the thrust bearing member 11 is arranged and attached to the concave portion 7a of the space forming member 7A. . The thrust bearing member 11 is formed separately from the space forming member 7A by using a resin material such as nylon, polyimide, polyamide, and liquid crystal polymer or a low friction material such as rubidium.
[0039]
In this bearing device 1A, since the space forming member 7A is made of metal, the thrust bearing member 11 made of a resin material or a low friction material is provided in consideration of extending the life. By increasing the rigidity of the space forming member 7A and realizing a configuration that can withstand high temperatures, the resin injection temperature and pressure conditions in the molding (outsert molding of the housing member 10) performed after the space forming member 7A is mounted. Etc. are alleviated. That is, in the present example, there is a concern that the cost is increased due to the thrust bearing member 11, but the molding condition is relaxed without selecting the resin material, so that the total cost can be reduced.
[0040]
Next, a configuration example of the bearing device according to the above-described second embodiment will be described with reference to FIG. The difference between the bearing device 1B shown in the present embodiment and the bearing device 1 is that a shaft end portion has a T-shape when viewed from the side, and a hydrodynamic bearing (thrust Bearing means). Therefore, the following description will focus on this difference, and the same reference numerals will be given to components having the same functions as in the case of the bearing device 1, and a detailed description thereof will be omitted.
[0041]
In the bearing device 1B, the retaining member 12 provided at the tip of the shaft 2 has a disk shape with a predetermined thickness, and is formed of a metal such as brass or stainless steel, or a polymer material such as nylon or LCP. Have been. The dynamic pressure generating grooves 13a, 13a,..., And 14a are formed on both end surfaces in the axial direction of the retaining member 12, that is, the surface 13 facing the radial bearing means 4 and the surface 14 facing the space forming member 7. , 14a,... Are respectively formed.
[0042]
The space forming member 7 has a recess 7 a for receiving the retaining member 12, thereby forming a space around the retaining member 12. The gap formed between the retaining member 12 and the space forming member 7 and the gap formed between the retaining member 12 and the radial bearing means 4 are filled with lubricating oil.
[0043]
As described above, in the bearing device 1B, the thrust bearing means 5 has a configuration of a hydrodynamic bearing type using the retaining member 12 and the space forming member 7, and the shaft 2 is relatively moved by the hydrodynamic bearing. Since it is rotatably supported on the optical disk drive, it has little vibration and is suitable for application to, for example, a motor for a recording device such as an optical disk drive or a hard disk drive.
[0044]
The method of manufacturing the bearing device 1B is basically the same as the above-described steps (1) to (4), except that the portions of the retaining member 12 where the dynamic pressure generating grooves 13a and 14a are formed Lubricating oil must be supplied between the bearing means 4 and the space forming member 7 to generate a predetermined dynamic pressure during rotation of the shaft (this is determined by the precision of the retaining member 12 and the space forming member 7). Is done.)
[0045]
Further, in this example, the configuration in which the dynamic pressure generating grooves 13a and 14b are formed in the retaining member 12 is shown, but the present invention is not limited to this, and the end face of the radial bearing means 4 facing the retaining member 12 is shown. Alternatively, various forms such as forming a dynamic pressure generating groove on the surface of the space forming member 7 facing the retaining member 12 are possible.
[0046]
Next, a rotary drive device according to the present invention will be described.
[0047]
FIG. 5 is a cross-sectional view showing an example of the configuration of the rotary drive device and showing application to a fan motor. In this embodiment, a configuration including the bearing device 1 is shown (a configuration using the bearing devices 1A and 1B is of course possible).
[0048]
The rotation drive device 15 includes a rotor portion 16 and a stator portion 17 having the bearing device 1.
[0049]
The rotor section 16 that constitutes a rotating body (rotor) includes a rotor yoke 18, a magnet 19, and blades 20, 20,..., And a boss 21 formed at a position to be the center of rotation has a shaft ( The end of the rotation shaft 2 is fixed by press fitting or the like. An annular magnet (such as a plastic magnet) 19 magnetized along the circumferential direction is adhered and fixed to the inner peripheral surface of the rotor yoke 18, and is attached to the outer peripheral surface of the cylindrical portion 16 a constituting the rotor portion 16. Are provided with a predetermined angle interval along the circumferential direction.
[0050]
The bearing device 1 is disposed on the stator unit 17 as shaft support means for rotatably supporting the shaft 2 that rotates together with the rotor unit 16. That is, the bearing device 1 is received in the concave portion 23 of the cylindrical support portion 22a formed in the stator yoke 22 constituting the stator portion 17, and is fixed by press-fitting or bonding. A coil portion 26 including a core 24 and a coil 25 is provided in a portion of the outer peripheral portion of the support portion 22a facing the inner peripheral surface of the magnet 19, and a coil portion 26 including the magnet 19 and the rotor yoke 18 is provided. The driving means 27 is constituted.
[0051]
A hole 28a is formed in the case 28 of the rotary drive device 15, and when the rotor portion 16 is rotated by energizing the coil portion 26, as shown by an arrow A in FIG. Then, the air is discharged to the outside through an air outlet (not shown) formed in the case 28.
[0052]
By mounting the bearing device 1 (or 1A, 1B) on such a fan motor, it is possible to realize a configuration that has no leakage of lubricating oil, has a long service life, and is excellent in reliability. Further, by using a hydrodynamic bearing type configuration as the radial bearing means 4, a motor having high reliability and high-speed rotation without lubricating oil leakage can be manufactured. Therefore, for example, it is suitable for a cooling fan of a device that requires high cooling performance. In application to a cooling system related to a heating element such as a CPU used in a computer, a configuration in which heat generated from the heating element is transmitted to a heat sink and the heat sink is air-cooled by a fan is exemplified.
[0053]
In addition, since the installation posture of the rotary drive device 15 does not matter in the direction along the axis 2, it can be used upside down from the state shown in FIG. .
[0054]
Further, the rotary drive device according to the present invention is not limited to a fan motor, and can be widely applied to motors of various devices (such as a rotary device for a disk-shaped recording medium and a rotary head drum device).
[0055]
According to the above configuration, the following advantages can be obtained.
[0056]
After attaching necessary members such as a space forming member and a seal member to the support means of the rotating shaft such as a radial bearing, the periphery of each member is left except for a small gap G in an exposed portion of the shaft. Since a structure in which a housing member formed of a polymer material or the like holds the space without any gap is employed, leakage of lubricating oil from inside the bearing device is eliminated. Therefore, it has a long life and excellent reliability.
[0057]
・ Since the manufacturing process is simple, there is no need to manage the packing with an adhesive or the like or check the sealing state.
[0058]
-A long life and high reliability can be obtained at low cost by using a hydrodynamic bearing using a sintered metal and resin molding of the housing member at low cost.
[0059]
The required accuracy can be guaranteed even when the gap between the seal member and the shaft is relatively small, and variations in the gap G can be reduced.
[0060]
【The invention's effect】
As is clear from the above description, according to the first and eighth aspects of the invention, there is no leakage of the lubricating oil, and a long life and high reliability can be obtained. In addition, for this reason, there is no inconvenience such as the device configuration and the manufacturing process being significantly complicated.
[0061]
According to the second and ninth aspects of the present invention, by providing a shaft retaining member and a member for forming a necessary space around the member, the shaft is prevented from being subjected to a shock, a change in atmospheric pressure or internal pressure, or the like. Missing can be prevented.
[0062]
According to the third and tenth aspects of the invention, the housing member is formed from a polymer material, whereby the sealing member and the like can be held from the outer periphery without any gap, and leakage of lubricating oil can be prevented.
[0063]
According to the fourth and eleventh aspects of the invention, in a configuration using a hydrodynamic bearing as the radial bearing means, highly accurate shaft support can be realized, and adverse effects due to leakage of lubricating oil can be prevented.
[0064]
According to the fifth and twelfth aspects of the present invention, the configuration of the thrust bearing means is simplified, which is advantageous in reducing the number of parts and man-hours and the cost.
[0065]
According to the sixth and thirteenth aspects of the invention, the lubricating oil in the gap is less likely to leak to the outside because the drawing pressure increases as the drawing pressure approaches the inside. In addition, the bias of the lubricating oil due to the eccentricity of the shaft is reduced, and the reliability is improved.
[0066]
According to the seventh and fourteenth aspects of the present invention, the configuration of the thrust bearing means is effective in reducing vibration and utilizing a retaining member and a member for securing a space around the retaining member. Is done.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a configuration example of a bearing device according to the present invention.
FIG. 2 is an explanatory view of a method of manufacturing the bearing device shown in FIG.
FIG. 3 is a sectional view showing a modified example of the bearing device of FIG. 1;
FIG. 4 is a cross-sectional view showing another example of the configuration of the bearing device according to the present invention.
FIG. 5 is a sectional view schematically showing a configuration example of a rotary drive device according to the present invention.
[Explanation of symbols]
1, 1A, 1B ... bearing device, 2 ... shaft, 3 ... bearing means, 4 ... radial bearing means, 5, 5A ... thrust bearing means, 6 ... retaining member, 7, 7A ... second member, 8 ... One member (member for lubricating oil seal), 9: lubricating oil, 10: housing member, 12: retaining member, 15: rotational drive device, 27: drive means

Claims (14)

In a bearing device provided with a shaft and bearing means for rotatably supporting the shaft,
A bearing device, comprising: a member for a lubricating oil seal disposed with a gap between the shaft and the shaft; and a resin housing member for holding the member and the bearing means from the outer periphery. The bearing device according to claim 1,
Radial bearing means for receiving a radial load applied to the shaft and thrust bearing means for receiving a thrust load applied to the shaft are provided as the bearing means, and a retaining member for the shaft and a space around the retaining member are secured. And a second member formed as a separate member from the first member for the lubricating oil seal is provided,
The bearing device, wherein the radial bearing means, the first member, and the second member are held by the housing member. The bearing device according to claim 1,
A bearing device wherein a polymer material is used for the housing member. The bearing device according to claim 2,
A bearing device comprising a hydrodynamic bearing as the radial bearing means. The bearing device according to claim 2,
A bearing device, wherein the thrust bearing means has a configuration in which an end surface of the shaft is formed into a curved surface and is brought into contact with the second member. The bearing device according to claim 1,
A bearing in which a portion of the shaft that forms a gap between the lubricating oil sealing member and the member for forming a lubricating oil is tapered, and the diameter of the shaft increases as approaching the inside along the shaft. apparatus. The bearing device according to claim 2,
A bearing device comprising a hydrodynamic bearing using the retaining member and the second member as the thrust bearing means. In a rotary driving device including a rotating body, a shaft that rotates together with the rotating body, bearing means for rotatably supporting the shaft, and driving means for rotating the rotating body,
A rotary drive device comprising: a member for lubricating oil sealing disposed with a gap between the shaft and the shaft; and a resin housing member for holding the member and the bearing means from the outer periphery. The rotary drive device according to claim 8,
Radial bearing means for receiving a radial load applied to the shaft and thrust bearing means for receiving a thrust load applied to the shaft are provided as the bearing means, and a retaining member for the shaft and a space around the retaining member are secured. And a second member formed as a separate member from the first member for the lubricating oil seal is provided,
The rotary drive device, wherein the radial bearing means, the first member, and the second member are held by the housing member. The rotary drive device according to claim 8,
A rotary drive device, wherein a polymer material is used for the housing member. The rotary drive device according to claim 9,
A rotary drive device using a hydrodynamic bearing as the radial bearing means. The rotation drive device according to claim 9,
A rotary drive device, wherein the thrust bearing means has a configuration in which an end surface of the shaft is formed into a curved surface and is brought into contact with the second member. The rotary drive device according to claim 8,
A portion of the shaft that forms a gap between the lubricating oil sealing member and the member for tapering is tapered, and the shaft diameter increases along the axis toward the interior. Drive. The rotation drive device according to claim 9,
A rotary drive device comprising a hydrodynamic bearing using the retaining member and the second member as the thrust bearing means.

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