JP2010019322A - Bearing unit, motor and electronic equipment using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a shaft from slipping out of a radial bering, by engaging a slipping-out preventive part in the other end direction of the shaft and a slipping-out preventive member in one end direction with a regulating member. <P>SOLUTION: This bearing unit includes the shaft 30 extending to the other end from one end, the radial bering 31, and a housing 12 for storing the radial bering 31 inside. The regulating member 15 is integrally formed in the housing 12. The shaft 30 is formed with the slipping-out preventive part 40b in the other end direction for engaging with one end side of the regulating member 15, and is attached with the slipping-out preventive member 41 in the one end direction for engaging with the other end side of the regulating member 15. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bearing unit that rotatably supports a rotating shaft or a rotating body that rotatably supports a shaft, and a motor and an electronic apparatus using the bearing unit.

  Conventionally, a bearing unit configured to rotatably support a rotating shaft has been used as shown in FIG. A bearing unit 100 shown in FIG. 13 includes a rotating shaft 101, a radial bearing 102 that rotatably supports the outer peripheral surface of the rotating shaft 101, and a thrust bearing 103 that rotatably supports the other end of the rotating shaft 101 in the thrust direction. Have The bearing unit 100 also includes a housing 104 that houses the radial bearing 102 and the thrust bearing 103, and an oil seal 105 that prevents leakage of lubricating oil filled in the housing 104 in order to reduce friction.

  The housing 104 has a cylindrical shape in which one end side into which the rotating shaft 101 is inserted is opened, and a thrust bearing 103 is provided on the other end side serving as a closing portion. In addition, the housing 104 is provided with a radial bearing 102 therein, and an oil seal 105 is provided on one end side serving as an open end.

  The radial bearing 102 has a dynamic pressure generating groove formed on the inner peripheral surface thereof in order to form a dynamic pressure fluid bearing together with the lubricating oil filled in the housing 104. A communication path 106 is formed between the housing 104 and the radial bearing 102.

  This communication path 106 connects one end side and the other end side of the rotating shaft 101 protruding from the radial bearing 102 in the thrust direction, and connects the closed end side and the open end side in the housing 104 to short-circuit the pressure. . As a result, the communication path 106 alleviates a decrease in static pressure on the closed end side of the housing 104 and prevents the lubricating oil from scattering from the open end side due to expansion of residual air in the lubricating oil of the housing 104.

  In the rotating shaft 101, the shaft tip 101a on the other end side is supported by a thrust bearing 103, and the outer peripheral surface of the shaft main body 101b is supported by a radial bearing 102. As a result, the rotating shaft 101 is supported by the housing 104 by projecting from the shaft insertion hole 105 a formed in the oil seal 105 of the housing 104 on the mounting portion 101 c side provided on one end side.

  Further, the rotary shaft 101 is provided with a groove portion 101d for preventing the shaft from slipping between the shaft tip portion 101a and the shaft main body portion 101b. An annular retaining member 107 is provided so as to correspond to the shaft retaining groove 101d. The retaining member 107 is made of a resin material such as polyimide so as to be elastically deformed when the shaft is inserted.

  The oil seal 105 is attached to the end face on the open end side of the housing 104 to prevent leakage of the lubricating oil filled in the housing 104, and is formed in an annular shape using a metal material or a resin material. Thus, the shaft insertion hole 105a is provided.

  When the oil seal 105 is made of metal such as brass, for example, the oil seal 105 is press-fitted into the open end of the housing 104 in which the radial bearing 102, the thrust bearing 103, and the retaining member 107 are inserted, and is attached by adhesion or the like. The oil seal 105 is subjected to an oil repellency treatment in order to prevent the lubricating oil from creeping out from one end surface. Further, when the oil seal 105 is made of a resin material such as polybutylene terephthalate (PBT), a joint portion with the housing 104 made of the same resin material is sealed by thermal welding or ultrasonic welding.

  Then, after the oil seal 105 and the housing 104 are integrated as described above, the rotating shaft 101 described above is inserted through the shaft insertion hole 105 a and supported by the radial bearing 102 and the thrust bearing 103. For example, when assembling the motor 120 having such a bearing unit 100, as shown in FIG. 14A, the housing 104 in a state where the rotating shaft 101 is not attached to the casing 121 of the motor 120 to be the stator 131 is fixed. Is done. The casing 121 is provided with a holder 126 for fixing the housing 104 and a core 125 around which a coil 124 attached to the outer periphery of the holder 126 is wound. On the other hand, the rotating shaft 101 is fixed to the rotor 132 as a part of the rotor assembly 122. A rotor yoke 127 and a ring-shaped rotor magnet 128 are fixed to the rotor assembly 122. A plurality of blades (not shown) that constitute a fan that rotates integrally with the rotor 132 are attached to the outer peripheral portion of the rotor assembly 122. Then, after the lubricating oil 123 is applied to the housing 104 fixed to the casing 121, the rotating shaft 101 integrated with the rotor 132 is inserted, and as shown in FIG. The assembly of the bearing unit 100 is completed. At this time, the lubricating oil 123 is filled to the extent that the shaft insertion hole 105a faces as shown in FIG.

  The bearing unit 100 as described above supports the rotary shaft 101 in the circumferential direction and the thrust direction by the radial bearing 102 and the thrust bearing 103. Further, since the bearing unit 100 has a sealed structure except for the shaft insertion hole 105a, there is no leakage of lubricating oil. Furthermore, since the rotation shaft 101 is prevented from being detached by the shaft retaining member 107, problems such as the removal of the rotation shaft 101 can be prevented to some extent.

  By the way, as shown in FIG. 15, the retaining member 107 has an inner diameter dimension a101 smaller than an outer diameter dimension a102 of the rotating shaft 101. It will be attached. As a result, the retaining member 107 is engaged with the end member 101e on one end side of the shaft retaining groove 101d and the retaining member 107 when the rotary shaft 101 moves in the axial direction of the thrust direction. This prevents the rotating shaft 101 from falling off.

  Accordingly, the retaining shaft 107 is inserted in the rotating shaft 101 having the outer dimension a102 larger than the inner diameter dimension a101 of the retaining member 107 while the retaining member 107 is already provided in the housing 104 at the time of assembly. At this time, when the retaining member 107 has a structure in which the rotating shaft 101 can be easily inserted, the retaining force on the rotating shaft 101 is reduced. Further, the retaining member 107 needs to have a small inner diameter when it is intended to increase the retaining force, and it is necessary to apply a very large force in the assembling process, or the plastic member is not forcibly inserted to cause plastic deformation. The problem that it occurs and does not fulfill the function of retaining is caused.

  Further, the retaining member 107 is formed of, for example, a resin material having elastic characteristics, and the retaining member 107 is already provided in the housing 104 as described above using the elastic characteristics of the resin material or the like. A rotary shaft 101 having an outer dimension a102 larger than the inner diameter dimension a101 is inserted. Therefore, if the retaining member 107 is formed of a resin material or the like, there is a problem that when a strong impact or the like is applied, the retaining member 107 is elastically deformed and the rotating shaft 101 is detached from the radial bearing 102.

Japanese Patent Laying-Open No. 2005-069382

  An object of the present invention is to provide a bearing unit that enables easy assembly and prevents the shaft from coming off from the radial bearing even when a strong impact or the like is applied thereto, a motor having the bearing unit, and an electronic apparatus Is to provide.

  In order to solve the above-described problems, a bearing unit according to the present invention includes a shaft extending from one end to the other end, a radial bearing, and a housing that accommodates the radial bearing therein. A member is integrally formed, and the shaft is provided with a stopper in the other end direction that engages with one end of the restricting member, and a stopper in one direction that engages with the other end of the restricting member. Is attached.

  The motor according to the present invention further includes a bearing unit that rotatably supports the rotor with respect to the stator. The bearing unit includes a shaft extending from one end to the other end, a radial bearing, and the radial bearing. The housing is integrally formed with a restricting member, and the shaft is formed with a stopper in the other end direction that engages with one end of the restricting member. One end direction retaining member that engages with the other end side of the member is attached.

  Furthermore, the electronic apparatus according to the present invention is equipped with a motor including a bearing unit that rotatably supports the rotor with respect to the stator. The bearing unit includes a shaft extending from one end to the other end, a radial bearing, And a housing for housing the radial bearing therein, the housing is integrally formed with a restricting member, and the shaft is formed with a stopper in the other end direction that engages with one end of the restricting member. In addition, a one-way direction retaining member that engages with the other end side of the regulating member is attached.

  According to the present invention, it is possible to easily assemble, and even when a strong impact or the like is applied, the other end direction retaining portion and the one end direction retaining member of the shaft are engaged with the restriction member. The shaft can be prevented from coming off from the radial bearing to the other end side.

  Hereinafter, a motor using a bearing unit to which the present invention is applied will be described in detail with reference to the drawings. A motor to which the present invention is applied is used in a heat radiating device 51 provided in an electronic apparatus such as a portable computer 50 that is an information processing apparatus that performs arithmetic processing of various information, as shown in FIG.

  As shown in FIGS. 2 and 3, this type of heat dissipation device 51 has a metal base 52 disposed in a portable computer main body. A heating element 53a that generates heat when operated by being energized like a CPU (Central Processing Unit) is attached to the electronic board 53 installed on the base 52. The base 52 is attached with a heat sink 54, a motor 1 to which the present invention is applied, a fan 2 that is rotated by the motor 1, and a fan case 3 that houses the fan 2. A bearing unit 4 is used for the motor 1 that rotationally drives the fan 2 of the heat dissipation device 51.

  The base 52 is formed in a substantially rectangular shape, and an electronic substrate 53 to which a heating element 53a is attached is installed. A heat sink 54 is attached on the heat generating element 53a via a heat transfer seal 53b. The heat sink 54 is a corrugated or fin-shaped heat sink, and is formed of a metal excellent in heat dissipation, such as aluminum. The heat sink 54 is disposed at a position facing the through hole 55 provided on the side surface of the portable computer main body when the base 52 is mounted in the portable computer main body.

  In addition, the motor 52 is attached to the base 52 so as to be adjacent to the heat sink 54, and a fan case 3 that houses the fan 2 that is rotated by the motor 1 is attached. The fan case 3 is formed with a circular first air inlet 5 that opens a position corresponding to a substantially central portion of the fan 2 rotated by the motor 1. An opening 6 is formed at one end of the portable computer main body so as to face the first air inlet 5 formed in the fan case 3 and communicate with the first air inlet 5. Further, the fan case 3 is formed with an exhaust port 7 for exhausting air sucked from the first intake port 5 to the outside. Note that at least one first intake port 5 may be formed.

  When the motor 1 is driven and the fan 2 is rotated in the direction of the arrow R1 in FIG. 3 by the motor 1, the heat dissipation device 51 as described above draws external air through the opening 6 provided in the portable computer body. 2 and in the direction of arrow D1 in FIG. Furthermore, the heat radiating device 51 sucks air into the fan case 3 through the first air inlet 5. The air sucked into the fan case 3 by the rotation of the fan 2 flows in the direction of arrow D2 in FIGS. 2 and 3, and further flows in the direction of arrow D3 in FIGS. 2 and 3 so as to pass through the heat sink 54. The air is exhausted to the outside of the portable computer main body through the through hole 55.

  The heat generated by the operation of the heat generating element 53a is transmitted to the heat sink 54 attached on the heat generating element 53a through the heat transfer seal 53b. In the heat dissipation device 51, the air that is sucked from the outside of the portable computer body when the fan 2 is rotated by the motor 1 circulates in the plurality of fins of the heat sink 54. The heat radiating device 51 radiates the heat transmitted to the heat sink 54 to the outside of the portable computer main body through the through hole 55 by the circulation of the air.

  Next, the motor 1 used in the heat dissipation device 51 described above will be described. As shown in FIG. 4, the motor 1 includes a stator 10 and a rotor 11.

  As shown in FIG. 4, the stator 10 is provided on a base 52 disposed in the portable computer main body. The stator 10 includes a bearing unit 4 to which the present invention is applied, a coil 13, and a core 14 around which the coil 13 is wound. The core 14 around which the coil 13 to which the drive current is supplied is wound is attached to the outer peripheral portion of the housing 12 of the bearing unit 4 which will be described in detail later.

  As shown in FIG. 4, the rotor 11 that constitutes the motor 1 together with the stator 10 is attached to a rotary shaft 30 that is rotatably supported by a radial bearing 31 of the bearing unit 4, and rotates integrally with the rotary shaft 30. The rotor 11 includes a yoke 19 and the fan 2 in which a plurality of blades 20 that rotate integrally with the yoke 19 are formed. The blade 20 of the fan 2 is formed integrally with the yoke 19 by being outsert-molded on the outer peripheral surface of the yoke 19.

  The yoke 19 has a cylindrical portion 19a and a flat plate portion 19b by being formed in a cylindrical shape closed on one side in the axial direction. A ring-shaped magnet 21 is provided on the inner peripheral surface of the cylindrical portion 19 a of the yoke 19 so as to face the coil 13 of the stator 10. The magnet 21 is a plastic magnet in which S and N poles are alternately magnetized in the circumferential direction, and is fixed to the inner peripheral surface of the cylindrical portion 19a of the yoke 19 with an adhesive or the like. The flat plate portion 19b of the yoke 19 is formed with a boss portion 22 to which the rotary shaft 30 is attached at a substantially central portion. A through hole 23 is formed in the boss portion 22, and an attachment portion 39 provided on one end side of the rotating shaft 30 is press-fitted into the through hole 23. Thus, the yoke 19 is integrated with the rotary shaft 30 and is rotatably attached to the stator 10.

  In the motor 1 having the above-described configuration, a drive current is supplied to the coil 13 on the stator 10 side from a drive circuit unit provided outside the motor 1 with a predetermined energization pattern. In the motor 1, when a drive current is supplied to the coil 13, the rotor 11 rotates integrally with the rotary shaft 30 by the action of the magnetic field generated in the coil 13 and the magnetic field from the magnet 21 on the rotor 11 side. When the rotor 11 rotates, the fan 2 having the plurality of blades 20 attached to the rotor 11 rotates integrally with the rotor 11. The fan 2 is rotated integrally with the rotor 11, thereby sucking outside air through the opening 6 provided in the portable computer body as shown in FIGS. 2 and 3, and further, the portable computer. The body is circulated and exhausted to the outside of the portable computer main body through the through hole 55 while flowing through the heat sink 54 provided in the portable computer main body. By this suction, circulation and exhaust, heat generated from the heating element 53a is radiated to the outside of the portable computer main body, and the heating element 53a and the portable computer 50 are cooled.

  Next, the bearing unit 4 to which the present invention is applied, which is used in the motor 1 and rotatably supports the rotor 11, will be described in detail. As shown in FIG. 5, the bearing unit 4 includes a rotary shaft 30 that is integrally attached to the boss portion 22 of the yoke 19, a radial bearing 31 that supports the rotary shaft 30 in the circumferential direction, and a radial bearing 31 that is internally provided. And a housing 12 having a regulating member 15 for preventing the rotary shaft 30 from coming off from the radial bearing 31 by inserting the rotary shaft 30 through the shaft insertion hole 47 on one end side, and a thrust of the rotary shaft 30 A thrust bearing 32 that supports one end in the direction, an elastic member 33 that supports the thrust bearing 32, and the elastic member 33 and the housing 12, the rotary shaft 30, the radial bearing 31, the regulating member 15, the thrust bearing 32, and And a sealing member 34 for sealing the elastic member 33 and the like. Hereinafter, the direction in which the seal member 35 is provided with respect to the rotating shaft 30 will be described as one end direction (the direction of the arrow A1 in the drawing), and the direction in which the thrust bearing 32 is provided with respect to the rotating shaft 30 is the other end. The direction (arrow A2 direction in the figure) will be described.

  As shown in FIG. 4, the housing 12 is provided so as to be connected to the base 52. The housing 12 includes a substantially disc-shaped restricting member 15 and a housing portion 16 formed at a substantially central portion of the restricting member 15.

  The restricting member 15 is formed in a substantially disk shape as shown in FIG. 6 from a metal material such as stainless steel (SUS). A through hole 17 through which the rotary shaft 30 is inserted is formed at a substantially central portion of the restricting member 15, and a restricting portion 18 that prevents the rotary shaft 30 from coming out of the radial bearing 31 is formed around the through hole 17. ing. A housing portion 16 is formed around the restriction portion 18 as shown in FIG. Further, as shown in FIGS. 4 and 6, one or more second intake ports 15 a may be formed around the housing portion 16. The motor 1 exhausts air sucked into the fan case 3 from the first intake port 5 to the outside through the exhaust port 7 or air sucked into the fan case 3 from the second intake port 15 a from the exhaust port 7. The air sucked into the fan case 3 from both the first air inlet 5 and the second air outlet 15a can be exhausted from the air outlet 7 to the outside. In addition, a plurality of attachment portions 15 b are provided on the outer peripheral portion of the regulating member 15. The motor 1 is attached to the base 52 by, for example, screws or the like (not shown) through these attachment portions 15b.

  As shown in FIG. 5, the housing portion 16 is formed of a resin such as polybutylene terephthalate (PBT) in a cylindrical shape with respect to one end surface side at a substantially central portion on one end surface side of the regulating member 15 formed of a metal material. It is formed integrally with the regulating member 15 by being outsert-molded with the material. That is, in the housing 12, the regulating member 15 is formed of a metal material, and the housing portion 16 is formed of a resin material. The housing part 16 has one end side opening part 16a which becomes an insertion end of the rotating shaft 30, and the other end side opening part 16b in which the thrust bearing 32 is disposed. The one end side opening portion 16a of the housing portion 16 is formed with an end side step portion 16c into which the seal member 35 is fitted when integrated with the seal member 35 that seals the one end side opening portion 16a. The one end side step portion 16c is provided so that, for example, one end surface of the seal member 35 and one end surface of the housing portion 16 are substantially on the same plane when the seal member 35 is fitted. Also, the other end side step portion into which the sealing member 34 is fitted when the other end side opening portion 16b of the housing portion 16 is integrated with the sealing member 34 that seals the other end side opening portion 16b. 16d is formed. The other end side step portion 16d is provided such that, for example, the other end surface of the sealing member 34 and the other end surface of the housing portion 16 are substantially flush with each other when the sealing member 34 is fitted.

  Inside the housing portion 16 of the housing 12 having the above-described configuration, a radial bearing 31 is fixed by press-fitting or bonding, or by bonding together with press-fitting. The housing portion 16 is filled with a lubricating oil 36 that is a viscous fluid that reduces the rotational friction of the rotary shaft 30. A core 14 around which a coil 13 to which a drive current is supplied is wound is attached to the outer peripheral portion of the housing portion 16. The housing 12 is not limited to the one formed separately from the base 52, and may be formed integrally with the base 52 and the fan case 3.

  The rotary shaft 30 includes a shaft tip portion 37 that is supported at the thrust bearing 32 by forming the other end in the axial direction as an insertion end into the radial bearing 31 in a circular arc shape or a tapered tip shape, and one end side of the shaft tip portion 37. The shaft main body 38 is inserted into the radial bearing 31 and supported rotatably, and the mounting is provided continuously at one end of the shaft main body 38 and attached to the boss 22 of the yoke 19. Part 39. The shaft body 38 has an axial length that is substantially the same as the axial length of the radial bearing 31, and an outer diameter that is substantially the same as the inner diameter of the radial bearing 31. Further, the shaft tip portion 37 has an outer diameter smaller than the outer diameter of the shaft main body portion 38, and the attachment portion 39 has an outer diameter substantially the same as the outer diameter of the shaft main body portion 38.

  Further, as shown in FIG. 7, a groove portion 40 is provided between the shaft tip portion 37 and the shaft main body portion 38. The groove portion 40 is formed in the circumferential direction of the rotary shaft 30 at a position corresponding to the restriction portion 18 of the restriction member 15 and has a substantially U-shaped cross section. That is, between the shaft tip portion 37 and the shaft main body portion 38, a small diameter that is continuous with the shaft tip portion 37 and the shaft main body portion 38 and has an outer diameter smaller than the outer diameter of the shaft tip portion 37 and the shaft main body portion 38. A portion 40a is provided. Further, the groove portion 40 includes a second end direction retaining portion 40b and a first end direction retaining portion 40c which are provided in a planar shape substantially perpendicular to the rotation shaft 30 with the small diameter portion 40a interposed therebetween.

  The other end direction retaining portion 40 b is the other end surface of the shaft main body portion 38, has an outer diameter substantially the same as the inner diameter of the radial bearing 31, and has an outer diameter larger than the inner diameter of the restricting portion 18 of the restricting member 15. ing. The other-end direction retaining portion 40b has a predetermined distance from the one end surface 18a of the restricting portion 18 when the rotating shaft 30 is inserted into the radial bearing 31 and supported by the radial bearing 31 and the thrust bearing 32. Is provided. Thereby, the other-end-direction retaining part 40b can prevent the rotational performance of the rotating shaft 30 from deteriorating due to contact with the one end surface 18a of the restricting part 18 when the rotating shaft 30 is driven to rotate. Further, the other-end direction retaining portion 40b is a regulating portion when the rotary shaft 30 is moved in the other end direction (in the direction of arrow A2 in FIG. 7), which is the shaft withdrawal direction, with respect to the radial bearing 31 due to impact or the like. By being engaged with the one end face 18a of 18, the further movement of the rotary shaft 30 in the other end direction, which is the direction of shaft disengagement, is restricted. Thereby, the bearing unit 4 can prevent the rotating shaft 30 from coming off from the radial bearing 31 in the other end direction (the direction of arrow A <b> 2 in FIG. 7). At this time, the bearing unit 4 can absorb an impact or the like by the housing portion 16 via the restricting portion 18, and can prevent the impact from being transmitted to the sealing member 34.

  In addition, the narrow-diameter portion 40a is formed with an attachment groove portion 40d to which the one-end direction retaining member 41 that prevents the rotary shaft 30 from coming off from the radial bearing 31 in one end direction is engaged and attached. For example, the mounting groove 40d is formed in the circumferential direction on the small-diameter portion 40a at the corner formed by the small-diameter portion 40a and the one-end-direction retaining portion 40c, and is approximately the same as the axial thickness of the one-direction retaining member 41. They have the same axial width and are formed so that the cross section is substantially U-shaped. The mounting groove portion 40d positions the axial direction of the one-end direction retaining member 41 so as to have a predetermined interval between the one end surface 41a of the one-end direction retaining member 41 and the other end surface 18b of the restricting portion 18. Therefore, the one-end direction retaining member 41 that is engaged with and attached to the mounting groove portion 40d has the one end surface 41a of the one-way direction retaining member 41 and the other end surface 18b of the regulating portion 18 when the rotary shaft 30 is driven to rotate. It is possible to prevent the rotation performance from deteriorating due to contact.

  Further, the one-end-direction retaining member 41 is arranged such that when the rotating shaft 30 is moved in one end direction (in the direction of arrow A1 in FIG. 7), which is the shaft-removing direction, with respect to the radial bearing 31 due to impact or the like. Engagement with the other end surface 18b restricts the rotation shaft 30 from being moved further in the one end direction, which is the direction of shaft disengagement. Thereby, the bearing unit 4 can prevent the rotating shaft 30 from coming off from the radial bearing 31 in the one end direction (the direction of the arrow A1 in FIG. 7). At this time, the bearing unit 4 can absorb an impact or the like by the housing portion 16 via the restriction portion 18. Further, the one-way retaining member 41 attached by being engaged with the mounting groove 40d is circumferentially disposed on the small-diameter portion 40a at the corner formed by the mounting groove 40d and the one-way retaining portion 40c. Since the other end surface 41b is also engaged with the one end direction retaining portion 40c when engaged with the other end surface 18b of the restricting portion 18, the force applied to the one end direction retaining member 41 is increased. It can also be received by the one-end direction retaining portion 40c, and can be prevented from being elastically deformed to the other end side.

  Here, the one-way direction retaining member 41 engaged with the groove portion 40 is a C-ring formed of a metal material such as stainless steel (SUS). The one-end direction retaining member 41 has an outer diameter larger than the inner diameter of the through hole 17 of the restricting portion 18. The one-end-direction retaining member 41 has one end surface 41a that is the other end surface 18b of the restricting portion 18 when the rotary shaft 30 moves in one end direction (the direction of arrow A1 in FIG. 7) due to an impact or the like. The rotation shaft 30 can be prevented from coming off from the radial bearing 31 in the one end direction (the direction of the arrow A1 in FIG. 7). Note that the one-way direction retaining member 41 is not limited to the C-ring, but is divided from the other-end opening 16b of the housing portion 16 after the rotary shaft 30 is inserted into the radial bearing 31, such as a split ring or a spring washer. Any member may be used as long as it is engaged with and attached to the attachment groove portion 40d of the groove portion 40 of the rotating shaft 30. Further, the one-way direction retaining member 41 is not limited to the one fitted and attached to the attachment groove portion 40d, and may be attached to the small diameter portion 40a without providing the attachment groove portion 40d.

  Further, a tapered portion 42 is formed between the shaft main body portion 38 and the mounting portion 39 as shown in FIG. The tapered portion 42 is opposed to the shaft insertion hole 47 of the seal member 35 with a predetermined interval. The tapered portion 42 is inclined so that the outer diameter gradually decreases toward the mounting portion 39 side. Accordingly, the gap 43 between the taper portion 42 and the shaft insertion hole 47 of the seal member 35 gradually increases toward the outside of the housing portion 16. As a result, the taper portion 42 forms a pressure gradient in the gap 43 between the rotating shaft 30 and the seal member 35, and the lubricating oil 36 filled to the extent that it faces the gap 43 inside the housing portion 16. Force to be pulled into the interior of 16 is generated. Therefore, the bearing unit 4 can prevent the lubricating oil 36 from leaking from the housing portion 16 because the lubricating oil 36 is drawn into the housing portion 16 when the rotary shaft 30 is driven to rotate.

  The radial bearing 31 that supports the rotating shaft 30 in the circumferential direction is formed in a cylindrical shape using, for example, a copper-based or copper-iron-based sintered metal. The radial bearing 31 holds a lubricating oil 36 filled in the housing portion 16 using a porous structure unique to sintered metal. The radial bearing 31 may be formed using brass, stainless steel, or a polymer material. The radial bearing 31 constitutes a hydrodynamic bearing together with the lubricating oil 36, and dynamic pressure generating grooves 44 and 45 are formed on the inner peripheral surface through which the rotary shaft 30 is inserted.

  As shown in FIG. 8, the dynamic pressure generating grooves 44 and 45 have a V shape on the inner peripheral surface of the radial bearing 31 and are continuously formed in the circumferential direction. Each of the dynamic pressure generating grooves 44 and 45 is formed such that the V-shaped tip is directed in the rotation direction R <b> 2 of the rotation shaft 30. Here, the dynamic pressure generating grooves 44 and 45 are formed in parallel in the vertical direction in the axial direction of the radial bearing 31. The number and size of the dynamic pressure generating grooves provided in the radial bearing 31 can be changed as appropriate depending on the size and length of the radial bearing 31.

  When the rotary shaft 30 inserted through the radial bearing 31 formed as a hydrodynamic bearing rotates continuously in the direction of the arrow R2 in FIG. 8 about the central axis CL, the lubricating oil filled in the housing portion 16 is filled. 36 circulates in the dynamic pressure generating grooves 44 and 45. The radial bearing 31 as the hydrodynamic fluid bearing supports the rotating shaft 30 that rotates by generating dynamic pressure between the outer peripheral surface of the rotating shaft 30 and the inner peripheral surface of the radial bearing 31. The dynamic pressure generated at this time makes the friction coefficient between the rotating shaft 30 and the radial bearing 31 extremely small, and realizes smooth rotation of the rotating shaft 30.

  Further, as shown in FIGS. 5 and 9, the radial bearing 31 is connected to the housing portion 16 so as to communicate one end portion and the other end portion in the thrust direction of the rotary shaft 30 protruding from the radial bearing 31. A passage 46 is formed. Specifically, a circumferential groove 46 a formed in the thrust direction is formed on the outer circumferential surface of the radial bearing 31. Further, one end surface groove portion 46b continuous with one end of the circumferential surface groove portion 46a is formed on one end surface 31a of the radial bearing 31, and the other end surface 31b of the radial bearing 31 is continuous with the other end of the circumferential surface groove portion 46a. The other end surface groove portion 46c is formed. The circumferential groove portion 46 a, the one end surface groove portion 46 b, and the other end surface groove portion 46 c function as the communication path 46 when the radial bearing 31 is accommodated in the housing portion 16. As shown in FIG. 5, the communication path 46 is a space in the gap portion of the shaft insertion hole 47 that is a space on one end side of the radial bearing 31 inside the housing portion 16 and a space on the other end side of the radial bearing 31. The space around the shaft tip portion 37 of the rotary shaft 30 communicates with the space.

  By forming such a communication path 46, the bearing unit 4 can prevent the generation of dynamic pressure due to the rotation of the rotating shaft 30 and the decrease in the static pressure in the space around the shaft tip portion 37 of the rotating shaft 30. it can. Accordingly, it is possible to prevent expansion of air staying inside the housing portion 16 and leakage of the lubricating oil 36 due to this. Thus, the bearing unit 4 communicates the space between the one end side and the other end side of the radial bearing 31, that is, the space on the one end side inside the housing portion 16 and the space on the other end side, by the communication passage 46. be able to. And the bearing unit 4 short-circuits the pressure difference inside the housing part 16 by this communication path 46, and prevents the static pressure of the space on the other end side from decreasing, so that the air staying inside the housing part 16 is reduced. Swelling and generation of air dissolved in the lubricating oil 36 can be suppressed, and leakage of the lubricating oil 36 can be prevented. Here, the communication passage 46 is formed by providing each groove on the radial bearing 31 side. However, the communication passage is formed by providing a groove on the housing side or by providing a groove on the housing and the radial bearing. You may make it form.

  As shown in FIGS. 5 and 7, the thrust bearing 32 that supports the rotating shaft 30 supported by the radial bearing 31 in the thrust direction seals the other end side opening 16 b of the housing portion 16. Is provided on the elastic member 33 provided in the substantially central portion of the. The thrust bearing 32 is formed as a pivot bearing that rotatably supports a shaft tip portion 37 of the rotary shaft 30 formed in an arc shape or a tapered tip shape.

  The elastic member 33 is, for example, a rubber sheet having elastic characteristics, and is provided with a thrust bearing 32 on one end surface thereof, and at a substantially central portion of the sealing member 34 that seals the other end side opening 16b of the housing portion 16. Is provided. When the rotary shaft 30 is moved in the other end direction (in the direction of arrow A2 in FIGS. 5 and 7), which is the axial disengagement direction, with respect to the radial bearing 31 due to impact or the like, Until the end-direction retaining portion 40b is engaged with the one end surface 18a of the restricting portion 18, an impact applied to the thrust bearing 32 via the rotating shaft 30 is elastically deformed and buffered, and the impact is sealed. Propagation to the member 34 is prevented. The elastic member 33 is not limited to a rubber sheet, and is made of a sheet and / or a sponge formed of at least one of rubber and foamed resin material, and can cushion an impact applied to the thrust bearing 32. Anything can be used.

  The sealing member 34 is formed of, for example, a resin material such as PBT, and an elastic member 33 that supports the thrust bearing 32 is provided at a substantially central portion of one end surface. When the sealing member 34 is press-fitted into the other end side opening 16 b of the housing portion 16, the sealing member 34 is locked to the other end side step portion 16 d of the housing portion 16 and is fitted to the housing portion 16. And the sealing member 34 is integrally provided by heat-welding or ultrasonic-welding to the housing part 16 similarly resin-molded after performing the oil-repellent treatment TL. And the sealing member 34 seals the other end side opening part 16b of the housing part 16 by heat-welding or ultrasonic-welding to the housing part 16, and providing integrally. Further, the sealing member 34 includes a shaft main body portion 38 of the rotating shaft 30, a radial bearing 31, a restricting portion 18 of the restricting member 15, a one-way retaining member 41, and a thrust bearing 32 by the housing portion 16 and a seal member 35 described later. The elastic member 33 and the like are sealed in the housing portion 16.

  The seal member 35 is formed using, for example, a resin material such as PBT or a metal material such as brass, and is formed in an annular shape having an outer diameter that can be fitted into the opening on one end side of the housing portion 16. Then, when the seal member 35 is press-fitted into the one end side opening portion 16a of the housing portion 16 that accommodates the radial bearing 31, the thrust bearing 32, etc., as will be described later, the seal member 35 is locked to the one end side step portion 16c of the housing portion 16. The housing portion 16 is fitted. When the seal member 35 is formed of a resin material, the seal member 35 and the housing portion 16 that is also resin-molded are thermally welded or ultrasonically welded after the oil-repellent treatment TL is applied. Are integrated. Further, when the seal member 35 is formed of a metal material, it is press-bonded and integrated to be integrated, and thereafter an oil repellency treatment is performed on the upper end surface to prevent the lubricating oil 36 from scooping out. The seal member 35 includes the housing portion 16 and the sealing member 34, and the shaft main body portion 38, the radial bearing 31, the restricting portion 18 of the restricting member 15, the one-way retaining member 41, the thrust bearing 32, and the elastic member. The member 33 and the like are sealed in the housing portion 16.

  Further, the seal member 35 functions as a shaft insertion hole 47 through which the annular hole portion passes through the rotation shaft 30. The seal member 35 has an inner diameter slightly larger than the outer diameter of the shaft main body portion 38 so that the rotating shaft 30 inserted into the shaft insertion hole 47 rotates without slidingly contacting the inner peripheral surface of the shaft insertion hole 47. It is formed to have. The shaft insertion hole 47 has a gap 43 between the inner peripheral surface and the outer peripheral surface of the shaft main body portion 38 with an interval sufficient to prevent the lubricating oil 36 filled in the housing portion 16 from leaking. It is formed. The seal member 35 in which the shaft insertion hole 47 is formed functions as an oil seal portion that prevents the lubricating oil 36 from leaking.

  In the bearing unit 4 to which the present invention having the above-described configuration is applied, the rotating shaft 30 is moved in the other end direction (arrow A2 direction in the figure), which is the axial disengagement direction, with respect to the radial bearing 31 due to impact or the like. When the other end direction retaining portion 40b of the rotating shaft 30 is engaged with the one end surface 18a of the restricting portion 18 of the restricting member 15, an impact or the like can be buffered by the housing portion 16. As described above, it is possible to restrict the rotation shaft 30 from moving in the direction of the other end, which is the shaft removal direction, and to prevent the rotation shaft 30 from coming off from the radial bearing 31 in the other end direction (the direction of arrow A2 in the figure). At this time, the bearing unit 4 can absorb an impact or the like by the housing portion 16 via the restricting portion 18, and can prevent the impact from being transmitted to the sealing member 34.

  Further, in the bearing unit 4, the other end direction retaining portion 40b of the rotating shaft 30 is formed of a metal material, and the restricting portion 18 of the housing is formed of a metal material. Similarly, the other end direction retaining portion 40b is engaged with the one end surface 18a of the restricting portion 18 of the restricting member 15 formed of a metal material, so that the rotating shaft 30 can be reliably attached even when a strong impact or the like is applied. It is possible to prevent the radial bearing 31 from coming off in the other end direction (the direction of the arrow A2 in the figure).

  Further, the bearing unit 4 is configured such that when the rotary shaft 30 is moved in one end direction (in the direction of the arrow A1 in FIGS. 5 and 7), which is the axial disengagement direction, with respect to the radial bearing 31 due to impact or the like. The one-end-direction retaining member 41 attached by being engaged with the mounting groove portion 40d of the groove portion 40 is engaged with the other end surface 18b of the restricting portion 18 of the restricting member 15, so that it is further in the one-end direction which is the axial disengagement direction. The movement of the rotary shaft 30 can be restricted, and the rotary shaft 30 can be prevented from coming off from the radial bearing 31 in the one end direction (the direction of arrow A1 in the figure). At this time, the bearing unit 4 can absorb an impact or the like by the housing portion 16 via the restriction portion 18.

  Further, the bearing unit 4 is attached by being engaged with the mounting groove portion 40d of the groove portion 40 of the rotating shaft 30 after the rotating shaft 30 is inserted into the radial bearing 31 such that the one-way direction retaining member 41 is a C ring or the like. Therefore, unlike the conventional retaining member, it is not necessary to apply a strong force to the rotating shaft 30 to insert the rotating shaft 30 in order to elastically deform the restricting member once when the shaft is inserted. it can.

  Furthermore, since the bearing unit 4 can form the one-end-direction retaining member 41 with a metal material such as stainless steel (SUS), the other end surface 18b of the restricting portion 18 of the restricting member 15 similarly formed of a metal material. , It is possible to reliably prevent the rotary shaft 30 from coming off from the radial bearing 31 in one end direction (the direction of arrow A1 in the figure) even when a strong impact or the like is applied.

  In addition, the bearing unit 4 prevents the rotation shaft 30 from coming off in the other end direction when the rotation shaft 30 moves in the other end direction (in the direction of arrow A2 in the figure), which is the shaft removal direction, with respect to the radial bearing 31 due to impact or the like. The portion 40b is engaged with the one end surface 18a of the restricting portion 18. Even in this case, the elastic member 33 that supports the thrust direction of the rotating shaft 30 buffers the shock received through the rotating shaft 30 until the engaging member is engaged. 34 can be prevented.

  Thereby, the bearing unit 4 does not need to be firmly and integrally provided between the opening 16b on the other end side of the housing portion 16 and the sealing member 34 by welding or caulking, and the sealing member 34 itself is also strong. There is no need to have mechanical strength, and the sealing member 34 that seals the opening 16b on the other end side of the housing portion 16 can be formed of a resin material. In the bearing unit 4, the housing portion 16 and the sealing member 34 are both formed of a resin material, so that the other end opening 16 b of the housing portion 16 and the sealing member 34 are thermally welded or ultrasonically welded. Etc., and can be easily assembled, and the sealing performance in the housing portion 16 can be improved.

  Further, in the bearing unit 4, the housing 12 and the regulating member 15 having the regulating portion 18 are formed of a metal material. Therefore, even when a strong impact or the like is applied, the rotating shaft 30 is reliably moved in one direction from the radial bearing 31. And it can prevent coming off to the other end direction. Furthermore, since the opening 16b on the other end side of the housing part 16 formed of a resin material and the sealing member 34 can be integrally provided by heat welding or ultrasonic welding, the sealing performance in the housing part 16 is improved. Can be made.

  In other words, the bearing unit 4 to which the present invention is applied enables easy assembly and prevents the rotary shaft 30 from coming out of the radial bearing 31 in one end direction and the other end direction even when a strong impact or the like is applied. It is possible to improve the sealing performance in the housing portion 16.

  Next, a manufacturing method of the bearing unit 4 to which the present invention configured as described above is applied will be described with reference to FIG.

  The manufacturing method of the bearing unit 4 to which the present invention is applied includes a step of inserting the radial bearing 31 into the housing portion 16, a step of sealing one end side of the housing portion 16, a step of inserting the rotating shaft 30, The step includes engaging the direction retaining member 41 with the rotary shaft 30, injecting the lubricating oil 36, and sealing the other end side of the housing portion 16.

  In the step of inserting the radial bearing 31 into the housing portion 16, as shown in FIG. 10A, the one end side opening portion 16a is formed in the housing portion 16 which is cylindrical and has one end side and the other end side opened in the axial direction. Then, the radial bearing 31 described above is inserted. In this step, the radial bearing 31 is placed on the one end face 18a of the restricting portion 18 of the restricting member 15 with the one end face of the radial bearing 31 facing the outside of the housing portion 16 from the one end side opening 16a. And positioned and attached. Then, the process proceeds to a step of sealing one end side of the housing part 16.

  In the step of sealing one end side of the housing part 16, as shown in FIG. 10B, the sealing member 35 that is sealed except for the shaft insertion hole 47 is one end side of the one end side opening part 16 a of the housing part 16. It is fitted to the stepped portion 16c. And the one end side opening part 16a of the housing part 16 and the sealing member 35 are integrated by performing oil-repellent treatment TL, for example by heat welding or ultrasonic welding. Thereby, the one end side of the housing part 16 is sealed except for the shaft insertion hole 47. And it moves to the step which inserts the rotating shaft 30.

  In the step of inserting the rotating shaft 30, as shown in FIG. 10C, the rotating shaft 30 to which the rotor 11 (not shown) is already attached is inserted into the housing portion 16 from the one end side opening 16 a of the housing portion 16. To do. In this step, the shaft main body 38 of the rotating shaft 30 is supported by the radial bearing 31. Then, the process proceeds to the step of engaging the end-direction retaining member 41 with the rotary shaft 30.

  In the step of engaging the one end direction retaining member 41 with the rotary shaft 30, the one end direction retaining member 41 is inserted into the housing portion 16 from the other end side opening 16 b of the housing portion 16 as shown in FIG. Is engaged with and attached to the attachment groove 40d of the rotary shaft 30 inserted into the interior of the rotary shaft 30. Accordingly, the rotation shaft 30 is prevented from coming off from the radial bearing 31 in the other end direction by engaging the other end direction retaining portion 40b with the one end surface 18a of the regulating portion 18 of the regulating member 15. At the same time, the one-end-direction retaining member 41 is engaged with the other end surface 18b of the restricting portion 18 of the restricting member 15, so that it is prevented from coming off from the radial bearing 31 in the one-end direction. Then, the process proceeds to the step of injecting the lubricating oil 36.

  In the step of injecting the lubricating oil 36, as shown in FIG. 11 (d), a predetermined amount of lubricating oil 36, which is a viscous fluid, is injected into the housing portion 16 sealed by the sealing member 34 and the sealing member 35. To do. Then, the process proceeds to a step of sealing the other end side of the housing part 16.

  In the step of sealing the other end side of the housing portion 16, as shown in FIG. 11D, the sealing member 34 that supports the elastic member 33 is the other end side of the other end side opening portion 16 b of the housing portion 16. It is fitted to the step portion 16d. The other end side opening 16b of the housing portion 16 and the sealing member 34 are integrated by, for example, heat welding or ultrasonic welding after the oil repellent treatment TL is performed. Thereby, the other end side of the housing part 16 is sealed. Then, by the sealing member 34, the sealing member 35, and the housing portion 16, the shaft main body portion 38 of the rotating shaft 30, the radial bearing 31, the restricting portion 18 of the restricting member 15, the one-way retaining member 41, the thrust bearing 32, and the elastic member. 33 etc. are sealed in the housing part 16. Through the above steps, the assembly process of the bearing unit 4 is completed as shown in FIG.

  Here, the step of injecting the lubricating oil 36 is performed after the step of engaging the end-direction retaining member 41 with the rotary shaft 30 is performed. However, the present invention is not limited to this. If it is after fitting, you may make it perform the step which inject | pours the lubricating oil 36 before fitting until the sealing member 34 is fitted.

  As described above, the manufacturing method of the bearing unit 4 to which the present invention is applied can obtain the bearing unit 4 having the above-described functions and effects through the above-described steps. Further, in the manufacturing method of the bearing unit 4, after the rotary shaft 30 is inserted through the radial bearing 31, the one-end-direction retaining member 41 is engaged with the mounting groove portion 40 d from the other end side opening portion 16 b of the housing portion 16. Can be attached. Such a manufacturing method of the bearing unit 4 does not require insertion of the rotating shaft 30 by applying a strong force for elastically deforming the restricting member when inserting the shaft, unlike the conventional bearing unit 4, and can be easily assembled. It can be carried out.

  Further, in the method of manufacturing the bearing unit 4, the other end side opening 16 b of the housing portion 16 and the sealing member 34 can be integrally provided by heat welding, ultrasonic welding, or the like. The manufacturing method of the bearing unit 4 does not need to be firmly and integrally provided between the other end side opening 16b of the housing portion 16 and the sealing member 34 by welding or caulking, unlike the conventional bearing unit 4. As a result, the assembly can be easily performed and the sealing performance in the housing portion 16 can be improved.

  And the bearing unit 4 to which the present invention manufactured by the manufacturing method as described above is applied is a simple assembly, and the rotating shaft 30 is surely arranged in one direction from the radial bearing 31 even when a strong impact or the like is applied. While being able to prevent coming off in the other end direction, the sealing performance in the housing part 16 can be improved.

  The motor 1 to which the present invention is applied is a motor including a bearing unit that rotatably supports a rotor 11 with respect to a stator 10, and includes the above-described bearing unit 4 as the bearing unit. is there. Such a motor 1 can be easily assembled and can prevent the rotating shaft 30 from coming out from the radial bearing 31 in one end direction and the other end direction even when a strong impact or the like is applied. It is possible to improve the sealing performance.

  The portable computer 50 to which the present invention is applied is a portable computer 50 equipped with the motor 1 having a bearing unit that rotatably supports the rotor 11 with respect to the stator 10. Such a bearing unit 4 is provided. Such a portable computer 50 can prevent the rotary shaft 30 from coming out from the radial bearing 31 in one direction and the other direction more reliably even when a strong impact or the like is applied by simple assembly. The sealing performance in the part 16 can be improved.

  The motor 1 to which the present invention is applied is not limited to being used as a motor of the heat radiating device 51 of the portable computer 50, and is not limited to the portable computer 50 or the like of various electronic devices having the heating element 53a. It can be used as a heat dissipation device. Further, the bearing unit 4 according to the present invention as described above is not limited to being used as a bearing of a motor of a heat dissipation device 51 or a spindle motor of a disk drive, and can be used as a bearing of various motors. . Furthermore, the bearing unit 4 according to the present invention can be widely used not only for a motor but also for a mechanism including a rotating shaft and a mechanism for supporting a component rotating with respect to the shaft.

  Further, the bearing unit 4 to which the present invention is applied is not limited to supporting the rotating shaft 30 in a rotatable manner, and may support the rotating body in a rotatable manner with respect to the shaft.

  Next, the motor 60 having the bearing unit 4 that rotatably supports the rotating body with respect to the shaft will be described. In addition, what has the structure similar to the motor 1 which supports the rotating shaft 30 rotatably mentioned above attaches | subjects the same code | symbol, abbreviate | omits description, and demonstrates only a structure different from the motor 1 hereafter.

  The motor 60 includes a stator 61 and a rotor 62 as shown in FIG. The stator 61 is provided on a base 52 disposed in the portable computer main body. The stator 61 includes a yoke 19, a coil 13, and a core 14 around which the coil 13 is wound. A core 14 around which a coil 13 to which a drive current is supplied is wound is attached to the inner peripheral surface of the cylindrical portion 19 a of the yoke 19. Further, the base 52 on which the stator 61 is disposed has at least one third air inlet 52 a for sucking air into the fan case 3 as shown in FIG. 12 around the stator 61. Also good.

  The rotor 62 that constitutes the motor 60 together with the stator 61 is attached to the housing 63 of the bearing unit 4 that is rotatably supported with respect to the shaft 30, and rotates integrally with the housing 63. The rotor 62 includes the bearing unit 4 to which the present invention is applied and the fan 2 in which a plurality of blades 20 that rotate integrally with the housing 63 of the bearing unit 4 are formed. The blade 20 of the fan 2 is formed integrally with the housing 63 by being outsert-molded on the outer peripheral surface of the regulating member 64. The housing 63 has a regulating member 64 and a housing portion 16, and the regulating member 64 is a second member relative to the regulating member 15 used in the motor 1 that rotatably supports the rotating shaft 30 described above. Since the configuration is the same except that the intake port 15a and the mounting portion 15b are not provided, description thereof will be omitted. A ring-shaped magnet 21 is provided on the outer peripheral surface of the housing portion 16 so as to face the coil 13 of the stator 61. The magnet 21 is a plastic magnet in which S and N poles are alternately magnetized in the circumferential direction, and is fixed to the outer peripheral surface of the housing 63 with an adhesive.

  In the motor 60 having the above-described configuration, a drive current is supplied to the coil 13 on the stator 61 side from a drive circuit unit provided outside the motor 60 according to a predetermined energization pattern. When the drive current is supplied to the coil 13, the motor 60 rotates the rotor 62 integrally with the housing 63 by the action of the magnetic field generated in the coil 13 and the magnetic field from the magnet 21 on the rotor 62 side. When the rotor 62 rotates, the fan 2 having the plurality of blades 20 attached to the rotor 62 also rotates together with the rotor 62. Then, as the fan 2 rotates, the motor 60 exhausts the air sucked into the fan case 3 from the first intake port 5 to the outside through the exhaust port 7, as shown in FIGS. Air sucked into the fan case 3 from the third intake port 52a is exhausted to the outside through the exhaust port 7, or sucked into the fan case 3 from both the first intake port 5 and the third intake port 52a. The air is exhausted from the exhaust port 7 to the outside. By this suction, circulation, and exhaust, heat generated from the heating element 53a can be radiated to the outside of the portable computer main body, and the heating element 53a and the portable computer 50 can be cooled.

  The motor 60 to which the present invention having the above-described configuration is applied is a motor including a bearing unit that rotatably supports the rotor 11 with respect to the stator 10, and the motor as described above is used as the bearing unit. 1 is provided with the same bearing unit 4. Such a motor 1 can be easily assembled and can prevent the rotating shaft 30 from coming out from the radial bearing 31 in one end direction and the other end direction even when a strong impact or the like is applied. It is possible to improve the sealing performance.

It is a perspective view which shows an example of the electronic device with which the motor using the bearing unit to which this invention was applied was incorporated. It is sectional drawing which shows the cross section along the II line | wire shown in FIG. It is a perspective view which shows the thermal radiation apparatus using the motor with which this invention was applied. It is sectional drawing which shows the structure of the motor to which this invention was applied. It is sectional drawing which shows the bearing unit to which this invention was applied. It is a top view which shows the main-body part of a housing. It is sectional drawing which expands and shows the other end surface side of the bearing unit shown in FIG. It is a perspective view which shows the dynamic pressure generation groove formed in the internal peripheral surface of a radial bearing. It is a perspective view which shows the shape of each groove part which comprises the communicating path formed between a housing part and a radial bearing. It is a figure for demonstrating the manufacturing method of the bearing unit to which this invention was applied, (a) is sectional drawing which shows the step which inserts a radial bearing in a housing part, (b) is one end of a housing part It is sectional drawing which shows the step which seals the side, (c) is sectional drawing which shows the step which inserts a rotating shaft, and the step which engages an end direction stopper member with a rotating shaft. FIG. 11 is a continuation view of FIG. 10 for explaining the manufacturing method of the bearing unit to which the present invention is applied, and (d) is a step of injecting the lubricating oil 36 and a step of sealing the other end side of the housing portion 16. (E) is sectional drawing which shows the bearing unit to which this invention was applied. It is sectional drawing which shows the structure of the 2nd Example of the motor to which this invention was applied. It is sectional drawing which shows the conventional bearing unit. It is a figure for demonstrating the assembly of the bearing unit used for the conventional motor, (a) is sectional drawing which shows the state before an assembly, (b) is sectional drawing which shows the state after an assembly. (C) is an expanded sectional view which shows that lubricating oil is filled to the part which faces the shaft insertion hole of a bearing unit. It is an expanded sectional view which shows the retaining member which comprises the conventional bearing unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor, 2 Fan, 3 Fan case, 4 Bearing unit, 5 1st inlet port, 6 opening, 7 Exhaust port, 10 Stator, 11 Rotor, 12 Housing, 13 Coil, 14 Core, 15 Control member, 15a 2nd 15b mounting portion, 16 housing portion, 16a one end side opening portion, 16b other end side opening portion, 16c one end side step portion, 16d other end side step portion, 17 through hole, 18 regulating portion, 18a one end surface, 18b Other end surface, 19 York, 19a Cylindrical portion, 19b Flat plate portion, 20 Blade, 21 Magnet, 22 Boss portion, 23 Through hole, 30 Rotating shaft, 31 Radial bearing, 31a One end surface, 31b Other end surface, 32 Thrust bearing, 33 Elastic member, 34 Sealing member, 35 Seal member, 36 Lubricating oil, 37 Shaft tip, 38 Shaft body, 39 Mounting portion, 4 Groove portion, 40a narrow diameter portion, 40b other end direction retaining portion, 40c one end direction retaining portion, 40d mounting groove portion, 41 one end direction retaining member, 41a one end surface, 41b other end surface, 42 taper portion, 43 gap, 44 movement Pressure generating groove, 45 Dynamic pressure generating groove, 46 Communication path, 46a Circumferential groove portion, 46b One end surface groove portion, 46c Other end surface groove portion, 47 Shaft insertion hole, 50 Portable computer, 51 Heat dissipation device, 52 Base, 52a Third Inlet, 53 Electronic board, 53a Heat generating element, 53b Heat transfer seal, 54 Heat sink, 55 Through hole, 60 Motor, 61 Stator, 62 Rotor, 63 Housing, 64 Restriction member, 100 Bearing unit, 101 Rotating shaft, 101a Shaft tip Part, 101b shaft main body part, 101c mounting part, 101d groove part, 101e end part, 102 Radial bearing, 103 Thrust bearing, 104 Housing, 105 Oil seal, 105a Shaft insertion hole, 106 Communication path, 107 Retaining member, 120 Motor, 121 Casing, 122 Rotor assembly, 123 Lubricating oil, 124 Coil, 125 Core, 126 Holder 127 rotor yoke, 128 rotor magnet, 131 stator, 132 rotor

Claims (12)

A shaft extending from one end to the other,
Radial bearings,
A housing for housing the radial bearing therein,
The housing is integrally formed with a regulating member,
A bearing unit in which the shaft is provided with a one-end-direction retaining member that engages with the other end side of the restricting member and is formed with a second-end direction retaining portion that engages with one end side of the restricting member. .   The bearing unit according to claim 1, wherein the one-end-direction retaining member is attached to the shaft with a predetermined distance from the regulating member.   The bearing unit according to claim 1, wherein the one-end direction retaining member and the regulating member are made of a metal material.   The bearing unit according to claim 1, wherein the housing is outsert molded on the retaining member.   The bearing unit according to claim 1, wherein the radial bearing is a hydrodynamic bearing. A thrust bearing that supports the other end of the shaft;
An elastic member for supporting the thrust bearing;
The bearing unit according to claim 1, further comprising a sealing member that supports the elastic member and seals the elastic member in the housing.   The bearing unit according to claim 1, wherein the thrust bearing supports the other end of the shaft so as to have a predetermined interval between the other-end-direction retaining portion and the regulating member.   The bearing unit according to claim 6, wherein the thrust bearing is a pivot bearing.   The bearing unit according to claim 6, wherein the elastic member includes a sheet and / or a sponge formed of at least one of rubber and a foamed resin material. The sealing member is made of a resin material,
The bearing unit according to claim 6, wherein the sealing member is integrally formed with the housing by welding. A stator, a rotor, and a bearing unit that rotatably supports the rotor;
The bearing unit is
A shaft extending from one end to the other,
Radial bearings,
A housing for housing the radial bearing therein,
The housing is integrally formed with a regulating member,
The motor in which the one end direction retaining member that engages with the other end side of the restriction member is attached to the shaft, and the other end direction retaining portion that engages with the one end side of the restriction member. A motor including a stator, a rotor, and a bearing unit that rotatably supports the rotor is mounted.
The bearing unit is
A shaft extending from one end to the other,
Radial bearings,
A housing for housing the radial bearing therein,
The housing is integrally formed with a regulating member,
An electronic device in which the shaft is provided with a one-end-direction retaining member that engages with the other end side of the regulating member and is formed with a second-end-direction retaining portion that engages with one end side of the regulating member. .

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