TWI279062B - Bearing unit, and motor using same - Google Patents

Abstract

A bearing unit is provided which supports a shaft (51) rotatably. It includes the shaft (51), a radial bearing (55) to support the shaft (51) circumferentially, a thrust bearing (58) to support the shaft (51) at one of thrusting-directional ends of the latter, a housing (56) having disposed therein the radial bearing (55) and thrust bearing (58) supporting together the shaft (51) and which is filled with a viscous fluid (67), and a spacer member (65) disposed inside the housing (56) to keep a gap defined between the end face of the radial bearing (55) and one side of a radial projection (54) included in the shaft (51). On the end face of the radial breading (55) opposite to one side of the radial projection (54), there is formed a first dynamic pressure producing recess (63) which produces a dynamic pressure by the viscous fluid. Also, on the side of the thrust bearing (58) opposite to the other side of the radial projection (54), there is formed a second dynamic pressure producing recess (64) which produces a dynamic pressure by the viscous fluid. As the shaft (51) rotates, the viscous fluid is circulated through the first and second dynamic pressure producing recesses (63, 64) to produce a dynamic pressure between the shaft and the radial and thrust bearings, respectively. The space member (65) provided as above permits to control the gap between the radial projection (54) and first and second dynamic pressure producing recesses (63, 64), respectively, with a high accuracy.

Description

(1) The present invention relates to a bearing unit and a yoke 5 which rotatably supports a shaft body, or a technical field to which the invention pertains, and a technical field of the invention. BACKGROUND OF THE INVENTION As an electronic device using a motor, a hard disk drive device having one of the material storage and reading devices of the museum is used in addition to a storage device for large-scale library storage devices and storage devices. In addition, a personal computer with a small size of a notebook, such as a PC (personal computer) card size memory card, or a card type computer with a card type is used. With. The PC card type hard disk drive should be used in a notebook PC or a portable terminal. In such a hard disk drive device, a spindle motor for rotationally driving a hard disk drive as a medium is provided. The main unit rotatably supports the main shaft. The dynamic pressure fluid bearing unit shown by the frictional resistance 1 is used as the bearing unit 1 060 shown in Fig. 1. The shaft is formed in the circumferential direction of the disk-shaped 1061 having a larger diameter than the shaft portion 1 068 and the support shaft 1061. The protruding piece, the embodiment and the drawing of the one end of the radial bearing body 1061 in the axial direction are simply described.) 3 The bearing unit of the bearing unit rotatably supports the rotary storage reading device. As its use is being expanded, a desktop PC or a notebook electronic device. The 1C (integrated circuit) is a small PC card type hard device. The PC card slot for users needs to be inserted as a data signal. The shaft motor uses a small bearing and a small load as shown in each bearing unit. The shaft body 1 062 of the protruding piece provided at one end of the portion 1 0 6 8 and the thrust bearing 1279062 supported on the shaft 1 069

(2) 1063, and a housing 1064 that supports these radial bearings i〇62 and thrust bearings 1063. The inner peripheral surface of the radial bearing 1062, the pair of first dynamic pressure generating grooves 1062a, 1062a formed on the outer peripheral surface of the opposing shaft portion 1068, and the protruding piece of the shaft body 1061 of the radial bearing 1062 At the opposite end face of 1069, a second dynamic pressure generating groove 106 2b is formed. A third dynamic pressure generating groove 1063a is formed on a surface facing the protruding piece 1 069 of the shaft body 1061 of the thrust bearing 1063. These dynamic pressure generating grooves i 〇 62a, 1062b, and 1063 a form a chevron-shaped chevron groove by forming a pair of V-shaped grooves in the rotation direction of the shaft body 1061 by connecting grooves. The radial bearing 1062 of the support shaft portion 1068 and the outer casing 1064 of the collection support thrust bearing 1 063 are formed in a cylindrical shape in which both ends are open. The side of the thrust bearing 1063 of the outer casing 1064 is provided with a cover and sealed. The side opposite to the side on which the thrust bearing 1063 of the outer casing 1064 is disposed is provided with a sealing member 1 0 6 6 through which the shaft insertion hole 1 067 through which the shaft portion 1 068 of the shaft 1061 is inserted is inserted. . The shaft body 1061 is inserted into the shaft portion 1〇68 at the radial bearing 1062, and the projecting piece 1069 at one end is supported by the thrust bearing 1 063. At this time, the shaft body 1〇61 causes the top end of the shaft portion 1〇68 to protrude from the outer casing 1064 via the shaft insertion hole 1067. In the outer casing 1064, when the shaft body 1061 rotates, the first and second dynamic pressure generating grooves are formed in the grooves 1062a and 1062b, and a lubricating oil for generating a viscous fluid of a dynamic pressure is filled. As such, the connection portion 1071 between the outer casing 1 〇 6 4 and the sealing member 1 〇 6 6 filled with the viscous fluid and the connection portion between the outer casing 1064 and the cover 1 065 (3) 1279062

1072' is completely sealed by the adhesive in order to prevent the leakage of the lubricating oil filled in the outer casing 1〇64. On the inner peripheral surface of the sealing member 1〇66, the application surfactant prevents the lubricating oil from moving from the shaft insertion hole 1〇67 to the outside of the casing 1〇64 by the centrifugal force generated by the rotation of the shaft 1061 or the like. . Although the shaft body 1〇61 used in the bearing unit 1〇6〇 described above has the shaft portion 1068 and the disc-shaped protruding piece 1069, there is a large gap in the field in which the protruding piece 1069 in the outer casing 1〇64 is located. In such a dynamic fluid bearing unit 1〇6〇, in order to generate dynamic pressure when the shaft body 1〇61 rotates, it is necessary to maintain the high precision between the protruding piece 1069 of the shaft body 1061 and the radial bearing 1062. The gap and the gap between the protruding piece 1〇69 and the thrust bearing 1063 are maintained, for example, at an accuracy of a number of 111. When these gaps are too large, when the shaft body 1061 rotates, it is not only impossible to sufficiently obtain the dynamic pressure effect of the viscous fluid generated by the first and second dynamic pressure generating grooves 1062a and 1062b, and if the gap becomes uneven, the rotation is performed. The shimmy of the shaft body 1 〇6 1 changes significantly. Gekou shown in Figure 1.

The dynamic pressure generated by the rotation of the shaft body 1〇61 cannot be sufficiently obtained with a large gap of 1 0 7; however, the wobble of the shaft body i〇6l is remarkably deteriorated. The bearing unit i〇6〇j keeps the viscous fluid from leaking in the outer casing 1064, and the cover 1 065 which forms the open end of the cylindrical g-shell 1064 and the connection table of the seal member surname Τ and the money member 1 06 6 are attached. 71, 1072, sealed by an adhesive, and more than 1 066 coated with a surfactant. In order to adopt such a structure, it is not complicated to believe that only the number of parts is increased and the vertical process becomes complicated. In addition, there is also a problem of lack of reliability in the use of seal management practices. 1279062

(4) Disclosure of the Invention An object of the present invention is to provide a novel bearing unit capable of eliminating the problem of the prior bearing unit as described above and a motor 0 using the same. A bearing unit with a reduced number of parts, easy assembly and high reliability, and a motor using the bearing unit.

Still another object of the present invention is to provide a bearing unit in which a shaft or a shaft body member is smoothly rotatable in a stable state and a motor using the shaft unit. Still another object of the present invention is to provide a bearing unit capable of preventing leakage of a viscous fluid such as lubricating oil filled in an outer casing, and a motor using the same.

Still another object of the present invention is to provide a bearing unit which can be easily and surely mounted at a certain mounting position of a stator or the like of a motor, and a motor using the bearing unit. Still another object of the present invention is to provide a bearing unit and a motor using the same, which can reliably discharge static electricity generated at a rotating portion of a shaft body or the like to the outside, and can achieve the use of the bearing unit The electronic machine is truly protected. In order to achieve the above object, a bearing unit according to the present invention has a shaft portion having a circular cross section and a disk-shaped projection having a larger diameter than the shaft portion provided at one end of the shaft portion. The shaft body, the bearing for the circumferential support of the shaft body, and the thrust of the opposite body and supporting the shaft body 1270062

The bearing at one end of the direction, the radial bearing supporting the shaft body, and the bearing are disposed inside, and the viscous fluid is filled, and the outer casing is sealed except for the shaft insertion hole through which the shaft body is inserted, and is disposed inside the outer casing. a spacer member that maintains a space between an end surface of the radial bearing and the other side surface of the protrusion, a other side surface that faces the end surface of the radial bearing of the protrusion or a thrust bearing that faces the other side surface Any one of the end faces forms a dynamic pressure generating portion that generates a dynamic pressure generated by the viscous fluid, a surface that faces the other side surface of the protruding body of the thrust bearing, or either side of the other side surface of the protruding body. A dynamic pressure generating portion that generates a dynamic pressure generated by the viscous fluid is formed. 1 By the spacer member, the interval between the end surface of the radial bearing and the other side surface of the projecting body can be maintained with high precision, so that the dynamic pressure generating portions generate a stable dynamic pressure. The bearing unit according to the present invention is further formed on the surface opposite to the shaft portion of the radial bearing to form a dynamic pressure generating a dynamic pressure generated by the viscous fluid.

unit. In the radial bearing, the dynamic pressure generating portion is also provided, and the shaft body is supported by the dynamic pressure generated by all of the dynamic pressure generating portions in the thrust direction, so that the load is controlled to become rotatable. In the bearing unit according to the present invention, the gap formed between the inner peripheral surface of the shaft insertion hole of the shaft body is sufficient to prevent leakage from the outer casing of the viscous fluid filled in the outer casing, and to prevent stickiness from the void. Fluid leaks and spreads out. The outer casing is integrally formed by molding of a synthetic resin. The inner circumferential surface of the shaft insertion hole formed by the outer casing or facing the inner circumference -10- 1279062

(6)

On either side of the outer peripheral surface of the shaft portion of the shaft body, a gap formed between the outer peripheral surface of the shaft portion and the inner peripheral surface of the shaft insertion hole is enlarged to the outer surface of the outer casing to form an inclined tapered portion. By forming the tapered portion, the viscous fluid filled in the outer casing can be pulled into the outer casing, and the leakage of the outer casing by the fluid can be surely prevented. The viscous fluid is filled into the outer casing at least in a gap formed between the outer peripheral surface of the shaft body and the inner peripheral surface of the shaft insertion hole.

The spacer member has a cylindrical portion fixed to the inner peripheral surface of the outer casing, and an annular sleeve integrally formed with the cylindrical portion and protruding in the radial direction of the cylindrical portion. A portion of the cylindrical portion of the spacer 4 is exposed to the outside through the hole of the outer casing. The outer casing and the spacer member may also be integrally formed. The radial bearing and the spacer member may also be integrally formed. The shaft system is a rotating shaft that is rotatably supported by the outer casing by a radial bearing and a thrust bearing.

In addition, the shaft system is fixed to the shaft body, and the outer casing can also be rotatable to the shaft body via the radial bearing and the thrust bearing. The end side portion of the outer side of the thrust bearing is formed of a synthetic resin, and the radial bearing is welded to the outer casing body made of the synthetic resin to be integrated. Further, the side surface portion of the side of the thrust bearing of the outer casing may be externally molded into the outer casing body of the radial bearing to be integrated with the outer casing body. The end side portion of the outer side of the thrust bearing is lower than the heat-resistant temperature forming temperature of the outer casing body of the radial bearing -11-1279062

(7) The synthetic resin is integrated with the outer casing body. The radial bearing preferably uses a material formed of sintered metal. As the shaft body, a material in which a projecting body made of a synthetic resin is integrally assembled to a shaft portion made of metal can be used. At this time, the protrusions may be formed of a sintered metal and integrally assembled to the material of the metal shaft portion.

In the outer casing of the bearing unit, it becomes possible to assemble the assembly target portion to which the outer casing is assembled by providing a fixing mechanism for mechanical fixing. The shaft body, the viscous fluid, the radial bearing, and the outer casing can release static electricity to the outside by forming a path to the outside of the outer casing.

The other bearing unit according to the present invention includes a shaft body having a disk-shaped projection that is larger than a shaft portion that is provided at one end portion of the shaft portion and the shaft portion that is circular in cross section, and supports the shaft body. a thrust bearing in the circumferential direction, a thrust bearing supporting the shaft body, and a thrust bearing disposed at one end of the thrust body to support the thrust body of the shaft body, and the radial bearing and the thrust bearing of the support shaft body are matched The internal viscous fluid is filled, and the shaft body is sealed except for the inserted shaft insertion hole; the outer casing is provided with: a first storage holding portion that holds the radial bearing and holds the thrust bearing In the second storage holding portion, the protruding body collecting portion that rotatably collects the protruding body of the shaft body formed between the radial bearing and the thrust bearing, and the first collecting and holding portion and the protruding body are separated The spacer of the position of the part. On either side of the surface facing the projection of the shaft of the spacer or the surface facing the spacer of the projection, a dynamic pressure generating portion for generating a dynamic pressure due to the viscous fluid is formed. -12- 1279062

(8) In the bearing unit, a dynamic pressure generating portion that generates a dynamic pressure due to the viscous fluid is formed on the inner peripheral surface opposed to the shaft portion of the radial bearing. Further, on either side of the surface facing the projecting body of the shaft body or the surface facing the thrust bearing of the projecting body, a dynamic force generating portion for generating a dynamic pressure due to the viscous fluid is formed.

The present invention is a motor including a bearing unit that rotatably holds a rotor for a stator; and the bearing unit constituting the motor has an axis formed at an end portion of a shaft portion and a shaft portion that are circular in cross section A shaft body of a large-diameter disk-shaped projecting body supports a thrust bearing in a circumferential direction of the shaft body, and is disposed to support the projecting body and support one end of the shaft body in the thrust direction.

The bearing is supported, and the radial bearing and the thrust bearing supporting the shaft body are disposed inside while the viscous fluid is filled, and the shaft body is sealed except for the inserted shaft insertion hole, and is disposed inside the casing. a spacer member that maintains a space between the radial bearing and a surface on one side of the protrusion; and an end surface of the radial bearing facing the one side of the protrusion, forming a dynamic pressure generating portion that generates dynamic pressure due to the viscous fluid . The other motor of the present invention includes a bearing unit that rotatably supports the rotor with respect to the stator, and the bearing unit constituting the motor has an axis formed at one end portion of the shaft portion and the shaft portion that are circular in cross section. a shaft body of a large-diameter disk-shaped projecting body, a thrust bearing supporting a circumferential direction of the shaft body, and a thrust bearing for supporting one end of the shaft body in the thrust direction of the shaft body, and supporting the shaft body The radial bearing and the thrust bearing are disposed inside while the viscous fluid is filled, and the shaft body is a sealed outer casing except for the inserted shaft insertion hole; the outer casing is provided with: a radial bearing is accommodated Keep -13- (9) 1279062

The first receiving and holding unit is a second storage holding unit that can be shaped between the radial bearing and the thrust bearing, and the protruding body of the shaft body can be placed in the protruding body collecting portion of the rotating place. The spacer which separates the position of the flute # 昂 1 collection holding portion and the sacral body accommodating portion, and the surface opposite to the spurs of the car body of the Kawasaki sheet are formed so as to be generated by the viscous fluid. The dynamics of the dynamic pressure of the invention can be more clearly explained by the invention. Other objects of the present invention, by way of the following, are illustrated by the following figures.

Let's go. The bearing unit of the preferred embodiment of the invention and the motor of the unit using the 忒 bearing unit are driven. Hereinafter, an embodiment of the motor of the bearing unit to which the present invention is applied will be described with reference to the drawings. Prior to describing the bearing unit of the present invention, an electronic machine using the bearing source of the present invention will be described. The electronic machine is installed in various kinds of companies.

In the computer of the material processing device such as the calculation of the bell shake, or the external storage device that is used as a computer, the drive device is driven by the disk drive. The drive of the drive is used by the PC card slot of the notebook computer, and the structure is very small. The drive device 1 for the present invention is applicable to the present invention, as shown in FIG. As shown in FIGS. 2 to 4, there is provided a casing 2 constituting a main body of the apparatus, a hard disk drive 3 in which the medium is stored in the casing 2, and a bearing unit in which the hard disk drive 3 is rotated and operated. The spindle motor 4 of the applicable motor is held by the main vehicle from the signal storage area of the hard disk drive 3 that is rotated and operated for a long time, for a long time -14-(10)1279062

A storage device 6 for the data signal of the disc drive 3. The casing 2 is formed by face-to-face coupling of the rotating half-type casings 2a, 2b of the magnetic heads 5 which are stored or read up and down, and the group hard disk machine 3 is rotated as shown in FIG. . Is fixed to the rotor 15 of the spindle motor 4 and

The rotary actuator 6 supporting the magnetic spindle 5 of the scanning hard disk drive 3 includes a pair of magnetic head supporting arms 7 and a voice coil 8 which are extended on both sides of the hard disk drive 3. The voice coil 8 is shown in Figure 4. &, is placed between the pair of magnets 9 in the outer casing 2 to form a voice coil 8 horse, telling the singer to be a strong ancestor. The rotary type transmission 6 is produced by the magnetic field generated by the voice coil 8 by the magnetic field generated by the power supply in the voice coil 8 and a pair of magnetic yokes 9; The electromagnetic force caused,

The supporter #7 supports the vehicle "centered in the direction of the arrow I and the arrow F2 in Fig. 2 and Fig. 3. By the drive of the voice coil motor, the head support #7 is rotated by the operation" for the support of the head Heads supported by arms 7

Any storage of the five rotating hard disk drives 3 is positioned to store data or to read stored data. Therefore, the magnetic head 5 can use, for example, a magnetoresistive effect element. Further, the disk drive unit is provided with a connection terminal 12 for electrical connection such as a capacitor on one end of the casing 2. Inside the casing 2, a circuit board 14 such as a general electronic component such as a system LSI (large integrated circuit) 13, an IC (integrated circuit), or the like is disposed. The spindle motor 4 of the hard disk drive 3 is rotated to have a rotor 15 and a stator 16 as shown in FIG. -15- 1279062

〇i) The rotor 15 is provided with a rotor casing 20 formed by a turntable port on which the hard disk drive 3 is placed, and a holding member 18 and a rotor magnet 19 together with the turntable 17. Therefore, the rotor 15 is a rotor casing 20 that is rotatably supported by a bearing unit 30 according to the present invention to be described later. The rotor casing 20 is formed of, for example, a magnetic material such as iron, and a fitting hole 26 is formed in the center portion. The rotor casing 20 is press-fitted into the fitting portion 5 2 ' provided at the tip end portion of the shaft body 51 which acts as the main shaft supported by the bearing unit 30, and the shaft body 5 of the bearing unit 30. One-piece rotary assembly. The turntable 17 is formed to protrude from the outer periphery of the rotor casing 20, and the hard disk drive 3 is placed. The portion of the inner casing 3 which is the inner ring is rotatably supported by the rotor casing 20 by the welding member 18 which is press-welded to the turntable 17 and the upper portion of the turntable 17. Further, the holding member 18 is formed in a ring shape by, for example, stainless steel. The rotor magnet 19, which is disposed on the inner peripheral surface of the cylindrical condition portion of the rotor casing 20, is formed in a ring shape, and the S pole and the drain are alternately magnetized in the surrounding rotation. The magnet 197 is formed, for example, from a sintered metal body of the type. The stator 16 that constitutes the spindle motor 4 together with the rotor 15 described above has a stator casing 2, a casing 56 of the bearing unit 30, and a drive coil 22 having a core 2 3 that is wound, A drive circuit or the like that controls the rotation of the spindle motor 4 is mounted without a flexible printed circuit board of the drawings. The stator case 2 1 is made of, for example, stainless steel, and the flexible printed circuit board is fixed by being adhered to the case 21 . The flexible printed circuit board is electrically connected to the drive coil 22. The U-phase terminal, the ν-phase terminal, the W-phase terminal, and the common terminal of the drive coil 22 are pulled out from the stator case 21 by the flexible printed circuit board to the outside -16 - (12) l279〇62

The flexible printed circuit board is electrically connected to the control circuit portion 25 through the terminals.

The core 23 to which the drive coil 22 is wound is provided, for example, with 9 poles. In this regard, the magnet 19 has a S pole and an N pole, for example, 12 poles, and is alternately formed in the circumferential direction. The T drive current is supplied from the energization control unit 25 to the w° coil 2 2 with a constant energization circuit, and the magnetic flux generated by the drive current supplied to the drive coil 22 and the magnetic field generated by the rotor magnet 19 are mutually In effect, the rotor 15 continuously rotates the stator i 6 with the vehicle centered on the body 51. The cylinder portion 28 is formed upright by 2 shouting 21. The cylindrical portion is "mounted" by the insertion of the bearing unit 3A of the shaft body 51 which is wound into the spindle of the spindle motor 4. That is, the cylindrical portion 28 serves as a mounting portion of the bearing unit 3A.

As described above, the bearing unit 30 of the shaft body 5 including the main shaft 5 constituting the main shaft of the spindle motor 4 is provided at one end portion of the shaft 53 of the shaft body 5 j as shown in Fig. 6 . The large-sized piece 54 of the disk-shaped protrusion having a larger diameter than the shaft portion 53 supports the radial bearing η in the circumferential direction of the shaft body 51, and supports the protruding piece 54 provided at one end of the shaft body 51 in the thrust direction. The thrust bearing ^, and the collection support the % of the outer casing of the radial bearing 55 and the thrust bearing 58. The disc-shaped projecting piece 54 provided at one end of the shaft body 51 abuts against the radial bearing 55 when the shaft body 支撑 is supported by the radial bearing 55 and the thrust bearing 58 and is attached to the outer casing %. The one end face also functions as a detachment preventing sheet which is prevented from coming off by the outer casing %. In the inner peripheral surface of the radial bearing 55 that rotates in the circumferential direction of the branch shaft 51, the outer peripheral surface of the pair of the shaft portions 53 constitutes a pair of pressure generating portion grooves for the dynamic pressure generating portion that generates the dynamic pressure. Slots 61, 62. In with the radial axis -17- 1279062

Further, the second dynamic pressure generating portion groove 63 constituting the dynamic pressure generating portion that generates the dynamic pressure is also formed on the opposite end surface of the projecting piece 54 of the shaft body 51 of the (13) 55. Further, a third dynamic pressure generating portion groove 64 constituting a dynamic pressure generating portion that generates a dynamic pressure is formed on a surface facing the protruding piece 54 of the shaft body 51 of the thrust bearing 58. The first dynamic pressure generating portion grooves 61 and 62 formed on the inner circumferential surface of the radial bearing 55 facing the outer circumferential surface of the shaft portion 53 are as shown in Fig. 7 on the inner circumferential surface of the radial bearing 55. A pair of grooves 61a which are V-shaped are formed in the circumferential direction in the circumferential direction by the connecting grooves 6 1 b continuously as the herringbone grooves formed. The first and second movements; the pressure generating portion grooves 6 1 and 62 are formed in the rotation direction R! of the shaft body 5 1 so that the distal ends of the V-shaped pair of grooves 6 1 a are formed. In the present example, the first dynamic pressure generating portion grooves 61 and 62 are formed in parallel in the vertical direction in which the cylindrical radial bearing 55 is formed. The number and size of the dynamic pressure generating portion grooves 61, 62 provided in the radial bearing 55 are appropriately selected in accordance with the size and length of the radial bearing 55. The second dynamic pressure generating portion groove 63 formed on one end surface of the radial bearing 55 is also located on the outer periphery of one end surface of the radial bearing 55 as shown in Fig. 8 to form a pair of grooves in a V shape. The groove 63a is formed continuously as a herringbone groove formed by the connecting groove 63b in the circumferential direction. At this time, the second dynamic pressure generating portion groove 63 is formed in the rotational direction R! of the shaft body 51 in the direction in which the distal ends of the V-shaped pair of grooves 63a are formed. The third dynamic pressure generating groove 64 formed on the surface opposed to the protruding piece 54 of the shaft body 51 of the thrust bearing 58 is also located on the outer circumference of the disk-shaped thrust bearing 58 as shown in FIG. To form a V-shaped pair of grooves 64a in the week -18- 1279062

The third dynamic pressure generating portion groove 64 is formed at a time when the connecting groove 64b is continuously formed as a herringbone groove, and the distal end of the V-shaped pair of grooves 64a is formed. The direction of rotation Ri of the body 51 is formed. The dynamic pressure generating portion grooves 61 to 64 of any one of the first to third embodiments are supported by the shaft body 5 1 , the second bearing 55 and the thrust bearing 58 to continuously rotate in the outer casing 56. The flow of the lubricating oil 67 which is filled with the viscous fluid filled in the outer casing 56 causes dynamic pressure between the shaft body 51, the radial bearing 55 and the thrust bearing 58. The support of the body 51. That is, the radial bearing 55 and the bearing function as a dynamic/force fluid bearing. The moving pole i generated by the rotation of the shaft 51 reduces the friction coefficient between the # bearing 55 and the thrust bearing 58 to "Small" gives a smooth rotation. This: The radial bearing 55 is formed of a sintered metal having a porous texture. The thrust bearing 58 is formed of a metal such as steel. The bearing unit 30 of the present invention The thrust is pushed, and the end surface of the radial bearing 55 and the bearing 58 are provided with an annular diameter, 1 ^ W interval 65. The inside of the spacer member 65 is a weight ratio formed in the shaft 51 - The outer diameter of the protruding piece 54 of the Μ π 鸲 portion is slightly larger than the outer peripheral surface of the spacer member 65. The I1 is slid from the outer peripheral surface of the yoke yoke 56, and the Ik member 65 has the following function. In the case of the present invention, as shown in Fig. 6, the imaginary sleeve unit 3〇, and the radial bearing 55 of the sheet 54; the early face of the glaze 51 and the radial bearing 5 5 The gap C between the end surfaces, the 1 of the male glaze glaze 55, and the face opposite the thrust bearing 58 of the protruding piece 54 and the thrust bearing 58 Empty, sound .? , ,, ', C2 ‘It is necessary to maintain a very high level of precision. For example, it is necessary to break the spindle of the bearing unit 3 β used in the magnetic and de-mechanical driving device 1 and the shaft 51 is stably rotated, and it is necessary to maintain the dimension -19. 1279062

(15) The accuracy of the number of gaps C1 and C2 is several μηι. When the accuracy is too large, the dynamic pressure generating portion grooves 6 1 to 6 4 of any of the first to third embodiments are not able to sufficiently transmit the effect of the dynamic pressure, and since the amount of the gap becomes uneven, the rotation 51 The wobble at the time of rotation becomes significantly large. Therefore, in the bearing unit 30 according to the present invention, as shown in Figs. 5 and 6, the spacer member 65 is disposed around the protruding piece 5 4 provided on the shaft body 51 to reduce the outer circumference of the protruding piece 54. The gap near the surface, thereby reducing the instability caused by the movement of the lubricating oil 67 when the body 51 is rotated, can obtain stable rotation of the shaft 51. In the bearing unit 3 of the present invention shown in Figs. 55 and 6, by arranging the male member 65 around the outer periphery of the protruding piece 54, the one end of the radial bearing 55 of the protruding piece 54 of the shaft body 51 can be maintained. The gap Ci between the end surface of the facing surface and the radial bearing", and the gap C2 between the surface facing the thrust bearing 58 of the protruding piece 54 and the thrust bearing 58 are each 4111. In this way, the spacer member 65 is provided, and the first dynamic pressure generating portion groove 63 provided in the radial bearing 55 and the third dynamic pressure generating portion groove 64 provided in the thrust bearing 58 are filled in the outer casing 56. The lubricating oil is uniformly distributed, and the dynamic pressure generation effect in the portion formed by the second dynamic pressure generating portion groove 63 and the third dynamic pressure generating portion groove 64 can be sufficiently obtained. Further, due to the gap C1 between the surface facing the one end of the radial bearing 55 of the protruding piece 54 of the shaft body y and the one end surface of the radial bearing 55, and the thrust bearing u of the protruding piece 54 The gap ^ between the face and the thrust bearing 58 becomes the same, and the wobble at the time of rotation of the shaft 51 can be reduced. Thereby, since the accuracy of the relative position in the axial direction of the outer casing 56 of the shaft body can be highly improved, the bearing unit -20, 1279062 can be extended.

(16) Element 30 and the life of the spindle motor 4 using the bearing unit 3〇 improve reliability. The outer casing % constituting the bearing unit 3A shown in Figs. 5 and 6 includes a cylindrical outer casing main body 71, a bottom closed portion constituting one end of the closed outer casing main body 71 and integrally forming an end portion with the outer casing main body 7 1 . 72. An upper closing portion 73 integrally formed with the casing body 71 constituting the other end of the casing body 71. In the central portion of the upper closing portion 73, a shaft insertion hole 7 through which the shaft portion of the shaft body 51 that is supported by the radial bearing 55 and the thrust bearing 58 stored in the outer casing 56 is inserted without being restrained is provided. . The outer casing 56 formed as above is externally molded to form a resin material by enclosing the radial bearing 55, the spacer member 65 and the thrust bearing 58 which are stacked in this order, as shown in FIG. The radial bearing 55 is disposed on the inner circumference of the casing body 7丨, and the thrust bearing is “positioned at the bottom of the casing body 71 such that the spacing member 65 is interposed between the radial bearing 55 and the thrust bearing 58. In this case, the shaft body 5 i also inserts the shaft portion 5 3 into the cylindrical radial bearing 5 5 in advance, and is radially connected to the bearing 5 5 and the thrust bearing 5 8 . When the shaft body 51 is combined with the integrally formed outer casing 56, the protruding piece 54 provided at one end faces the thrust bearing 58, and the assembly part 52 provided at the other end is provided by The shaft insertion hole of the upper closing portion 73 of the outer casing body 71 is protruded. Thus, the outer casing 56 is integrally formed by enclosing the radial bearing 55, the partition member 65, and the thrust bearing 58 and supporting the shaft body 51. When the shaft body 5 turns, it flows in any one of the dynamic pressure generating grooves 61 to 64 of any one of the first to H 3 Φ k Lubricating oil as a viscous fluid that generates dynamic pressure 67 • 21 - 1279062

(17) Filled. The filling of the lubricating oil 67 is to be inserted into the outer casing 56 of the shaft body 51 in the filling groove in which the lubricating oil 67 is stored. Subsequently, the filling tank into which the outer casing 56 is thrown is vacuum-extracted by a vacuum apparatus. Thereafter, the vacuum-extracted charging tank is taken out in the atmosphere, and the lubricating oil 67 is filled in the outer casing 56. ,

At this time, when the lubricating oil 67 is swollen due to temperature change, it is prevented from leaking into the outside of the casing 56 through the shaft insertion hole 75, and when the temperature is contracted, the shaft body 51 and the shaft are not inserted. The filling of the gap 79 formed between the holes 75 is insufficient. That is, the height i of the oil surface of the lubricating oil crucible due to the temperature change is set within the range of the shaft insertion hole 75. The filling of the outer casing 56 of the lubricating oil 67 is performed by using a vacuum apparatus. The pressure inside the outer casing 56 is lower than the outside. Its Z, the lubricating oil 6 7 is easily prevented from being exposed by the outer casing 56.

The bearing unit 30 of the present invention is formed by forming a radial bearing 55 with a sintered metal, the lubricating oil 67 is saturated with the radial bearing 55, and by the rotation of the shaft 51, dynamic pressure is generated. The lubricating oil 67 is also filled in any one of the dynamic pressure generating grooves 61 to 64 of any of the first to third. That is, the lubricating oil 67 is filled into all the spaces in the outer casing 56. Further, the synthetic resin material constituting the outer casing 56 is not particularly limited, but it is desirable to use a material which increases the contact angle of the lubricating oil 67 which does not adhere to the lubricating oil 67 filled in the outer casing 56. Therefore, the outer casing 56 is preferably formed using a fluorinated ethylene synthetic resin such as polyimide, polyamide, or polyacetal. Further, the use of polycarbonate (pc), propylene, butadiene, styrene copolymer (ABS), etc. • 22-1279062

Synthetic resins are also available. In addition to this, very high precision forming is formed by a liquid crystal polymer. However, the shaft insertion hole formed in the upper closing portion 73 of the outer casing 56 is the shaft portion 53 of the shaft body 51 that is inserted through the shaft insertion hole 75, and is not in the inner circumferential surface of the shaft insertion hole 75. It is formed by rotating and contacting and having an inner diameter slightly larger than the outer diameter of the shaft portion 53. At this time, as shown in FIGS. 6 and 10, the shaft insertion hole 75 has a function of preventing leakage of the lubricating oil 67 filled in the outer casing 56 between the inner circumferential surface and the outer circumferential surface of the shaft portion 53 from the outer casing 56. In this way, a gap 79 for preventing leakage of the lubricating weir 67 filled in the outer casing 56 between the shaft body 5 and 6 is formed to form an upper closing portion of the shaft insertion hole. 73. The oil seal is formed. 1 You can form a mixture of four yimide polyamines, polyamides, or nylons, so that the inner circumferential angle of the lubricating oil π to the shaft insertion hole 75 is approximately 6G degrees. The bearing unit according to the present invention comprises: an inner peripheral surface of the = shaft insertion hole 75, and is not in the upper closing portion 73, because the upper portion of the lubricating oil 67 is closed, so It is possible to prevent the oil 67 from the shaft body from sliding through the shaft insertion hole 75 to the outside of the outer casing 56, and to provide a taper portion on the side of the shaft insertion hole 7 of the shaft body 51. 77. The outer peripheral surface of the crucible body 51 formed between the inner peripheral surfaces of the tapered portion 77 and the outer peripheral insertion hole of the body 2 is inclined to be larger than the axis. The tapered portion 77 is expanded outside the outer wall 56. The outer peripheral surface of the inner peripheral surface of the hole 75 is formed into a pressure taper with the wheel, and the resulting -23-1284962

The amount of force in which the lubricating oil 67 of the nB is filled into the outer casing 56 is filled in the outer casing 56. When the shaft 5 1 rotates, the timings 4, n, and 'because the lubricating oil is drawn into the inside of the outer casing 56, the radial bearing 55 and the thrust which are formed by the pressure fluid bearing are provided by the weir. The dynamic pressure of any one of the first to third of the bearing 58 generates any one of the grooves 6 1 to 64, and the lubricating oil 67 does infiltrate to generate dynamic pressure, thereby realizing the stability of the shaft body 51. The support is also prevented from leaking the lubricating oil 67 filled in the outer casing 56.

In the vehicle relating to the present invention, the saponin*30 is retained by the retention-α nx ^ _ %, and the dynamic pressure generating grooves 61 to 64 of any one of the first to third embodiments are infiltrated to generate a motion. pressure

The lubricating oil 6 7 of I is as shown in Fig. 6 and Fig. 1 and is faced with the inner peripheral surface of the tapered portion 7 7 and the shaft insertion hole 7 5 formed by the outer casing 56 from the shaft body 51. The formed voids 79 are filled. That is, the full lubricating oil 67 is filled in the gap 'in the outer casing 56' and is further impregnated into the bearing 55 formed of sintered metal.

Therefore, there will be described a gap 79 formed between the tapered portion 7 7 formed by the shaft body 51 and the inner peripheral surface of the shaft insertion hole 7 5 . The minimum interval of the gap 79 corresponds to the interval C3 formed between the outer peripheral surface of the shaft body 51 and the inner peripheral surface of the shaft insertion hole 75, and the interval C3 is desirably about 20 to 200 Km and 100 μm or so. Satisfactory. When the interval C3 is smaller than 20 μΠ1, it is difficult to ensure the molding precision when the outer casing 56 of the bearing unit 30 is integrally molded by synthetic resin. When the interval C3 of the gap 79 is larger than 200 μη, when the impact is applied to the bearing unit 30, the lubricating oil 6 7 filled in the outer casing 56 is scattered outside the outer casing 56 to reduce the impact resistance. The lubricating oil 6 7 filled in the outer casing 56 is shock-resistant as it is scattered on the outer casing 56, as shown by the following formula (1) '-24 - 1279062 (20) (1) G = (12 γ cos/3 / 2 pc 2) / g. Here, 7 : surface tension of lubricating oil β : contact angle of lubricating oil Ρ · · density of lubricating oil C : interval between rotating shaft and the insertion hole of the vehicle g · · free falling acceleration according to formula (1), resistant The impact G is inversely proportional to the square of the interval c of the gap 79. The amount of oil surface rise hy due to thermal expansion is as shown in the following formula (2), and h = = V a Δί/2 π Rc (2) means 0 Here, V Lubricating oil filling amount a Thermal expansion coefficient At Temperature change amount R Shaft radius according to the formula (7), because the oil level rising amount h is inversely proportional to the size of the interval c, so the interval c is narrowed. Though the impact resistance G is increased by y, the increase in the oil surface height h of the lubricating oil 6 7 due to the rise in temperature becomes intense, and the thickness of the shaft insertion hole 7 5 in the axial direction becomes necessary. 2 π im~3 mm shaft diameter shaft portion 53 shaft body 5 In the bearing unit 30 of the bearing unit 30, the interval c 31 of the gap 79 formed between the shaft portion 53 and the shaft insertion hole 7 -25 - (21) 1279062 is about 1 00 μηι, and the height of the shaft insertion hole 75 is 1 For the degree of 1 mm, lw pass's impact resistance is 1000G or more, and the temperature resistance can withstand up to 80 〇C, and it can be gentleman, ~, gt, and it can be used to prevent lubrication from being filled in outside. The high-reliability bearing unit of the oil 67 is 3〇. Further, the bearing of the present invention is taken as an outer casing το 30, because the space C3 of the gap 79 formed between the outer peripheral surface of the shaft body 51 and the inner surface of the shaft insertion hole 75 is provided to the outer casing. The outer portion of the outer surface of the rib 5 is enlarged and inclined by a tapered portion 77. Therefore, the space C3 formed by the gap 7 9 formed between the outer peripheral surface of the shaft body 51 and the inner peripheral surface of the shaft insertion hole 75 is formed. The pressure taper, and the centrifugal force generated when the bran is rotated by the shaft 51, produces a force that pulls the lubricating oil 67 filled in the outer casing 56 into the interior of the outer casing 56. The receiving unit 30, the gap 79 between the inner peripheral surfaces of the shaft y, the inner peripheral surface of the shaft, and the inner peripheral surface of the shaft yoke are sealed by the surface 缄 to prevent the lubricating oil 67 from scattering. Next, referring to FIG. 11 and FIG. 12, 〇-d relates to other examples of the present invention.

The bearings b,, . . . , 8 〇 shown in FIGS. 11 and 12 can be formed by externally molding the outer casing 86. Further, in the 6> shown in Figs. 11 and 12, the % bearing unit 80 is given a common symbol in the portion common to the bearing unit 30 of the above-mentioned $6, and the omitted words are as shown in Fig. 11. The resulting bearing injury is partially assembled 90. This partially assembles the thrust bearing 58 and the spacer member 81. The unit 8A, as shown in Fig. 12, has a shaft body 5 1 , a radial bearing 5 5 , a partition member 8 , a cylindrical portion 82 and a ring '26. (22) Ϊ 279062, a sleeve 83 - Body composition. The annular sleeve 83 is formed on the inner peripheral surface of the cylindrical portion 82 so as to protrude toward the outer peripheral surface of the protruding piece 54 of the vehicle body 51 over the entire circumference. As shown in FIG. 12, the shaft body 51, the radial bearing 55, the spacer member 8丨, and the axial bearing 58 are prepared to be temporarily assembled as a partial assembly 9 ^ for the partial assembly 90, As shown in Fig. 11, the outer casing 86 is plastically molded in a synthetic tree. By thus preparing the partial assembly 9 in advance, the outer molding of the outer casing 86 can be performed more easily. Others, a bearing φ TO 疋 : 疋 according to still another example of the present invention will be described with reference to FIG. The bearing unit 91 is now common to the bearing unit 3 of Fig. 6 described above. The details are given and the detailed description is omitted. The difference from the bearing unit 30 shown in Fig. 6 is as follows. That is, the radial bearing 94^ spacer member 95 is integrally formed. As described above, the radial bearing 94 and the spacer member 95 are integrally formed, and the number of parts can be reduced to achieve a reduction. Referring to Fig. 14, a bearing unit according to still another example of the present invention will be described. In the bearing unit 101, the same portions as those of the bearing unit 3 of Fig. 6 described above are given the same reference numerals, and detailed description thereof will be omitted. The difference from the bearing unit 3 shown in FIG. 6 is that a portion of the spacer member 1〇2 is fitted to the through hole 1 〇3 provided in the outer casing 56 and the protruding portion 104 facing the outside of the outer casing 56 is set up. In this manner, the spacer member 1〇2 is fixed to the outer casing 56 by fitting the protruding portion 1〇4 to the through-hole 〇3, and the outer casing 56 can be surely fixed. However, a synthetic resin such as polyalkyleneamine, polyamine, or nylon used as a molding material for the outer casing 56 is not sufficiently bonded to the metal by adhesion. The bearing unit according to the present invention is made of synthetic resin -27-1279062

(23) The outer casing 56 is positioned, and the outer casing 56 made of synthetic resin is fitted to the cylindrical portion 28 made of metal and fixed. Therefore, the outer casing 56 cannot be surely bonded to the cylindrical portion 28 made of metal by using an adhesive.

On the other hand, the spacer member 10 2 disposed in the outer casing 56 is formed of a metal such as iron, brass, or aluminum. Therefore, a projection portion 104 is provided in a portion of the spacer member 102 formed of metal, and by engaging the projection portion 104 with the outer portion of the outer casing 56, the bonding surface of the outer casing 56 and the cylindrical portion 28 can be obtained. By changing to the metal-like portion, the outer casing 56 can be surely bonded to the cylindrical portion 28 made of metal using an adhesive. Further, the protruding portion 104 provided in the spacer member 102 may be provided in a plurality as shown in Fig. 15. By providing the protruding portion 104 made of metal facing the outside of the outer casing 56, the area of the metal portion contacting the protruding portion 104 becomes large, and the outer casing 56 can be surely bonded to the metal using the adhesive. The cylindrical portion 28 is made.

A bearing unit relating to still another example of the present invention will be described with reference to Figs. 16 and 17. In this example, the same components as those of the bearing unit 30 of Fig. 6 described above are given the same reference numerals, and detailed description thereof will be omitted. The bearing unit 110 constructed as shown in Fig. 16 integrally forms the spacer member 11 1 on the inner circumference of the outer casing 56. In the production of such a bearing unit 1 1 〇, as shown in Fig. 17A, the outer casing main body 71 including the upper closing portion 73 is formed by external molding of the bearing 55 in the first resin forming step. At this time, the spacer member 11 1 is formed integrally with the outer casing 56. Next, as shown in Fig. 17B, the radial bearing 5 5 assembled by the casing body 7 1 is inserted through the shaft body 5, and the shaft -28-1279062 is disposed on the protruding portion 5 of the opposite shaft body 51.

(24) The bottom of the outer casing body 7 1 disposed on the thrust bearing 58 is externally molded with a synthetic resin material, and a bottom closure portion 7 2 having a bottom portion of the closed casing body 7 1 is formed. According to such a forming process, a dynamic pressure fluid bearing unit having a small number of parts and high reliability can be easily produced. Further, the synthetic resin material which is molded to form the bottom seal 'closed portion 72 on the bottom side of the outer casing main body 7 1 is a material which can be formed by using a temperature lower than the temperature of the synthetic resin constituting the outer casing main body 7丨. . By using such a material ' does not affect the forming accuracy of the previously formed outer casing body 71, the outer casing 56 that integrates the bottom closing portion 72 with the outer casing body 71 can be formed. In the bearing unit of the present invention and the motor of the bearing unit, the radial bearing, the thrust bearing, and the shaft body, and the spacer member are housed in a integrally formed outer casing using synthetic resin, and the shaft body 51, such as As shown in FIG. 1A, since the outer portion of the outer casing 56 is protruded through the gap 79 having a space C3 sufficient to prevent leakage of the outer casing 56 as the lubricating oil 67 filled in the viscous fluid of the outer casing 56, it can be surely prevented by Leakage of the outer casing 56 of the lubricating oil 67 filled in the outer casing 56. φ Since the leakage of the outer casing 56 of the lubricating oil 67 filled in the outer casing 56 can be prevented, the lubricating oil 67 can be used to generate the grooves 61 to 64 in the first to third dynamics of the dynamic pressure generating portion. Any of the grooves circulate. Then, the bearing unit relating to the present invention, as shown in Fig. 6, is between the surface facing the one end of the radial bearing 55 of the projecting piece 54 of the shaft body 5 i and the one end surface of the radial bearing 55. The gap C i and the gap c2 between the surface facing the thrust bearing 58 of the protruding piece 5 4 and the thrust bearing 58 can maintain extremely high precision; since there is no eccentricity to achieve a stable state The rotation of the lower shaft 5丨, so -29- 1279062

It is useful to use a data access device like a hard disk drive device. With regard to the bearing unit of the present invention, since the protruding piece 54 of the rotating shaft body 51 and the gap between the bearing 55 and the thrust bearing 58 can be raised;

The precision of Cl and C2 flows through the second and third dynamic pressure generating grooves 63 and 64 of the dynamic pressure generating portion, whereby the dynamic pressure can be fixed and the two-precision rotation state of the vehicle body can be obtained. Further, since the radial bearing 55 is also formed as a 'door (7)', the grooves 6 1 and 6 2 are generated by the first dynamic pressure of the danger, so that the shaft body 1 is made only by the direction and the thrust direction. The frictional resistance is small and the load of the singular J is strong, and the L-shaped bearing comes to the structure of the branch building. In this way, the shaft body 5 1 supported by the dynamic pressure fluid bearing is extremely small in load, so that stable rotation can be ensured even at a high speed, and reliability such as life can be improved. In the above-mentioned respective bearing units, since the outer casing 56 is formed of a synthetic resin, it is possible to perform molding or the like, and i can be easily manufactured with high precision without an assembly process.

Furthermore, since each of the above-mentioned bearing units can prevent the leakage and scattering of the outer casing 56 of the oil: 7 filled in the outer casing 56, it is used when the disk drive is driven, because there is no lubricant contaminated by the hard disk. π 』 蹲, so I know the high-powered disk drive device. However, although the above-mentioned shaft body is formed as a protruding piece of the shaft portion and the protruding body, the shaft portion and the protruding piece may be formed separately, and the following may be referred to as FIG. 18 to FIG. Any of the examples of the bearing unit using the shaft body formed by separating the vehicle portion and the protruding piece. -30- 1279062 (26) In the same portions as those of the bearing unit 30 of Fig. 6 described above, the same reference numerals will be given to the same reference numerals, and the detailed description will be omitted. The shaft portion 353 of the straight shape and the disc-shaped protruding piece 354 of the bearing unit 300 shown in Fig. 18 are formed of separate members. The shaft portion 353 is formed of a metal such as stainless steel. Since the shaft portion 353 is formed in a straight shape formed by only the tapered portion on the outer peripheral surface, it is possible to perform centerless grinding. Since the shaft portion 3 5 3 has a shape that is unsatisfactory for centerless grinding, it can be easily formed while maintaining high precision roundness. The projecting piece 3 54 is attached to one end of the shaft portion 35, and the synthetic resin material or the sintered metal material is formed by external molding to form a shaft body 351 formed integrally with the shaft portion 35. Further, on one end of the shaft portion 353 which is formed by the outer surface of the protruding piece 354, a synthetic resin material or a groove portion 35 5 into which the sintered metal material is to be inserted is formed. By providing such a coupling groove portion 35 5 , the protruding piece 354 and the shaft portion 353 are firmly integrated. The protruding piece 3543 of the shaft body 351 shown here is formed by molding the outer portion of the shaft portion 353 in a later step, so that a dynamic pressure generating groove can be formed at the time of molding. That is, the second dynamic pressure generating groove 363 may be formed on a surface facing the one end surface of the radial bearing 55 supported by the outer casing 56, and may be formed on the other surface facing the thrust shaft 58. The third dynamic pressure creates a groove 364. The second dynamic pressure generating groove 363 formed by the surface of the protruding piece 354 is formed like the second dynamic pressure generating groove 63 formed on one end surface of the radial bearing 55, as shown in FIG. On the outer side of the protruding piece 354, (27) · l279〇62 will form a V-shaped pair of grooves 3 63 a ^ U ^ | 乍 as a person continuously formed by the distance 1, # Μ 363b in the circumferential direction The glyphs of the glyphs are sinuous, and the secrets are formed. At this time, the 筮9 toughness pressure generating groove 363 is formed into a v-shape, and the second direction of the shaft body 351 is formed. K-side

Further, a groove 364 is formed at the third pressure of the other % # A opposite to the thrust bearing 58 of the protruding piece 3 54, and is also formed as a surface.

^ ^ As shown in Fig. 20, located at the abrupt H: outer circumference: this will be a V-shaped one, the groove one: the piece: the groove formed by the connecting groove_ continuously formed by the chevron-shaped groove: The third dynamic pressure generating groove 364' is formed in a v-shaped tip end (four) in the rotational direction Ri of the shaft body 351. By using such a shaft body 351, since the radial bearing 55 and the thrust bearing 58 are not necessary to form a dynamic pressure generating groove, these turning bearing 55 and thrust bearing 58 become easy to manufacture. Further, in the protruding piece 3 54, only one of the second dynamic pressure generating grooves or the third dynamic pressure generating grooves 363, 364 may be formed, and even if it is formed in this way, since it is not in the diameter It is necessary to provide a dynamic pressure generating groove to one of the bearing 55 or the stop bearing 55, so that the bearing becomes easy to manufacture. Further, in the protruding piece 3 54, no dynamic pressure is generated, and the groove is formed only in a flat disk shape. In such a shaft body 351, the formation of the shaft portion 353 becomes easy and the manufacture of the bearing unit 3A becomes easy. However, the bearing unit 3A according to the present invention is attached to the shaft body 5 as shown in Fig. 5! The fulcrum rotor 15 is mounted with the rafter casing 21 to constitute the spindle motor 4. Therefore, the bearing unit 3 〇 needs to be positioned and securely mounted to the outer -32-1279062

(28) Shell 21 〇 Next, an example of a bearing unit provided with a mechanical fixing mechanism in which the stator casing of the spindle motor is positioned and fixed and mountable, and a spindle motor using the bearing unit will be described with reference to Figs. In the same portions as the spindle motor 4 of Fig. 5 described above, the same reference numerals are given to the same portions, and detailed description thereof will be omitted.

The bearing unit 1300 of the spindle motor 1 14 shown in Fig. 21 is formed in the outer casing 56 as a step portion 13 1 which constitutes a catch portion of a mechanical fixing mechanism for the stator casing 21. The step portion 133 is formed on the outer periphery of the side provided by the upper Qin seal portion 73 of the outer casing 56 projecting from the shaft body 51. Further, the cylindrical portion 28 of the stator casing 21 constituting the stator 16 of the spindle motor 114 corresponds to the mounting portion of the casing 56 of the bearing unit 130. The bearing unit 130 which forms the step portion 13 1 constituting the engaging portion in the outer casing 56 is inserted into the cylindrical portion 28 of the stator casing 21 formed of a metal such as stainless steel, and is provided in the cylinder. The riveting part of the top side of the part 2 8

The 1 3 2 deformation causes the step portion 1 3 1 to be caught, and is mechanically fixed to the stator case 2 1 . In this manner, the rivet portion 1 3 2 is provided by the cylindrical portion 28 to which the outer casing 56 is inserted, and the bearing unit 1300 is mounted, and the load that is not given to the bearing unit 1300 is available to the spindle motor 114. The location is fixed and installed. As the material of the outer casing 56 of the bearing unit 130, even if it is formed of a synthetic resin such as polyalkenamide, polyamide or nylon which is insufficiently bonded to the metal, since the bearing unit 1 3 0 Since the cylindrical portion 28 is fixed by the caulking mechanism, the outer casing 56 of the synthetic resin can be mechanically fixed to the cylindrical portion 28 made of metal. -33- 1279062

(29) As means for mechanically fixing the bearing unit according to the present invention to a motor such as a spindle motor, in addition to the above-described caulking means, it may be assembled by means of hot melt. The means for hot-melting is to provide a bump for hot-melting on the outer side of the outer casing formed of the synthetic resin of the bearing unit, and to fit the bump to the side of the stator casing, and fix the bearing unit to the heat-deformed portion. Stator housing. Further, a threaded portion may be integrally provided on the outer casing of the bearing unit, and the threaded portion may be locked into a screw hole on the side of the stator casing to be assembled. Further, a flat portion is provided on the outer circumferential surface of the cylindrical outer casing forming the bearing unit, or a protruding portion is provided on the outer circumferential surface of the outer casing, and the flat portion and the concave portion corresponding to the flat portion and the protruding portion are disposed on The cylindrical portion of the stator casing is assembled by positioning the bearing unit at a position where the stator casing of the motor is mounted. In the bearing unit used in the above-described spindle motor, although the shaft body is rotatably supported by the outer casing, the outer casing can be supported by rotating the shaft body. An example of a spindle motor using a bearing unit that fixes a shaft body will be described with reference to the drawings. In the same manner as the bearing unit 30 of Fig. 5 and the main shaft motor 4 using the bearing unit 30, the same reference numerals are given to the same portions, and detailed description thereof will be omitted. As shown in Fig. 23, the shaft-fixed spindle motor 204 is fixed to the stator housing 1 21 by the shaft body 51 of the bearing unit 203. The shaft body 5 1 presses the mounting portion 52 provided on the side protruding from the outer casing 56 into the mounting hole 152 which is bored in the stator casing 121, and is fixed to the stator casing 1 2 1 . The bearing unit 203 is fixed by the shaft body 5 1 , and the outer casing 56 is rotated to the shaft body 5 1 without being restrained by the 1279062 (30)

The outer casing supported on the outer side of the bearing 153 再 is turned to the outer surface of the iron, and the rotation of the iron 19 is rotated, according to the side of the stator casing 121 fixed to the shaft body 51 of the tree state, as shown in the figure. As shown in FIG. 23, the outer casing 56 of the unit 230 is provided with a cylindrical coil assembly portion around the outer periphery of the coil assembling portion I53, and the winding of the drive coil 222 is assembled. The spindle motor 2〇4 is a rotor. 115 is attached to the side of the outer casing % which is pivotally supported by the pair of shafts. The rotor 115 presses the rear fitting hole 154 which is pierced in the center portion of the casing 12 to the bottom of the casing 56 of the bearing unit 23 to be closed. The fitting portion 155 around the outer circumference I of the portion 72 is rotatably assembled integrally with the body 6. The outer casing 56 of the rotor 115 is formed in the fitting hole 154 and the outer periphery of the fitting portion 155. The mounting position of the spindle motor is a cylindrical shape of the rotor casing 12, and the rotor 2 is also disposed opposite to the driving coil 22 on the side of the stator 116. In the outer periphery of the rotor casing 120, the hard disk machine 3 is formed. Cut the disk 1 7. The hard disk drive 3 is also used internally, ? Tin Zhouting inner side portion of the turntable 1 and the grasping member 17 of the turntable 18 is supported to wash - the outer rotor body may W20-

The bearing unit of the present invention can also be fixed to the pumping body 51. The bearing relating to the present invention is selected from the fact that the vehicle of the present invention is formed of a support metal made of grease as described above and not only the shaft body can be rotated. The outer casing is made rotatable, and the structure of the motor or the like can be used to accommodate the unit's outer casing of the shaft body with the electrical edge material, and it is impossible to confirm -35-1279062

(31) The static electricity charged by the shaft body due to the rotation is discharged to the outside of the bearing unit. The following problems occur when a bearing unit that cannot discharge static electricity due to the rotation of the shaft body to the outside of the bearing unit is used in the disk drive device. Since the discharge mechanism or the discharge path of the shaft body which is the rotating portion of the bearing unit is not provided, the static electricity is brought to the hard disk drive which is supported without being restrained by the shaft body. For example, a magnetoresistive element head that is brought to a scanning hard disk drive for accessing a data signal because the withstand voltage performance is about 1 〇 〇 V

I is very low, so I am worried that it will be destroyed due to static electricity. Therefore, when a bearing unit according to the present invention is used, it is preferable to have a disk drive device or the like that accesses a data signal that is removed by a small amount of static electricity. Electrostatic discharge to the external structure. Hereinafter, a bearing unit capable of discharging static electricity generated by the rotation of the shaft body to the outside of the casing and a spindle motor using the bearing unit will be described. In the following description, the same components as those of the bearing unit and the spindle motor shown in Figs. 5 and 6 will be given the same reference numerals, and detailed description thereof will be omitted. A spindle motor 2 1 4 capable of discharging the static electricity generated by the rotation of the shaft body 51 to the outside of the outer casing 56 is used, as shown in FIG. 24, and the spindle motor shown in FIG. 5 described above. 4 Similarly, the drive unit 0 for the drive is used for the bearing unit 1 6 0 of the spindle motor 2 1 4 as shown in Fig. 24, such as 1279062

(32) Fig. 25 shows that the outer casing 156 is formed of a conductive resin using a mixed conductive material. The conductive resin is a conductive resin in which graphite metal powder having conductivity is incorporated into polycarbonate, polyester, nylon, polyalkylene, liquid crystal polymer or the like. Further, it is possible to precisely form a graphite carbon nanotube having electrical conductivity for use in a synthetic resin. The lubricating oil 157 filled in the outer casing 丨56 formed of such a conductive resin also uses a material having conductivity. For the lubricating oil crucibles 5-7, for example, a conductive material such as a conductive carbon compound may be blended in an oil such as an vinegar (Ester), an ester system, a peroxygen system or a fluorine system. The radial bearing 丨 5 5 disposed in the outer casing 156 is formed of a sintered metal, brass or stainless steel formed of a conductive metal material as described above. Further, the shaft body 51 supported by the outer casing 156 is also formed of a conductive metal such as stainless steel. The bearing unit 16A formed using the above-described material has a conductive lubricating oil 157 filled with the shaft body 51 by the shaft body 51, and a discharge path to the radial bearing 55 and the electrically conductive outer casing 156. That is, the bearing unit 16 is formed to form a discharge path in which the static electricity generated by the rotation of the shaft 51 in the outer casing 156 is released to the outside of the outer casing 156. The spindle motor 214' using the bearing unit 16 6 having such a discharge path is electrostatically generated by the rotation of the shaft 51, as shown in Fig. 24, and can be discharged to the metal stator case 21 provided in the stator 16 The cylinder is 2 8 . Thus, the bearing unit 1 〇 spindle motor 214 relating to the present invention is used because the static electricity generated by the rotation of the shaft body 51 can be discharged to the stator -37-1279062

(33) The outer casing 21, so that the static electricity can be prevented from being charged to the hard disk drive 3 by the turntable 17. As a result, the static electricity of the head which is accessed by the data signal is released, and the damage is surely prevented. In order to form a discharge path from the rotating shaft of the bearing unit to the stator housing of the spindle motor, the bearing unit 1〇1, 11 0 ' shown in Figs. 14 and 15 described above is lubricated in the housing 56. The oil 6 7 can form a discharge path from the shaft body 51 to the outside of the outer casing 56 by using a material having electrical conductivity. Thus, by using the Lu bearing unit having the discharge path from the shaft body to the outside of the casing, it is possible to avoid the influence of static electricity and to securely protect the components of the hard disk drive device constituting the magnetic head or the like. The bearing unit of the present invention having a discharge path can prevent the leakage of the lubricating oil filled in the outer casing as described above. Therefore, the magnetic head or the hard disk in the hard disk drive device is not contaminated by the lubricating oil, so that it can be sure The protective head or hard disk 'can constitute a hard disk drive device capable of safely recording and reproducing information signals. Further, other examples of the bearing unit according to the present invention will be described with reference to the drawings. The bearing unit is also the same as the bearing unit 3〇 shown in FIGS. 5 and 6 described above, and is used in the spindle motor of the hard disk drive device, so that the bearing element shown in FIG. 5 and FIG. 6 above is used. The common parts of the spindle motor 4 are given the same reference numerals and the detailed description is omitted. The bearing unit 3 30 of the present example is fitted to the cylindrical portion of the stator casing 21 of the spindle motor 304 as shown in Fig. 26 . 28 and installed. At this time, the outer circumference of the upper layer closing portion 73 of the outer casing 256 by which the bearing unit 323 protrudes by the shaft body 51 - 38 - Ϊ 279062

(34) The hook 28a provided on the tip end of the cylindrical portion 28 is caught and fixed in the stator casing 21. As shown in FIGS. 27 and 28, the bearing unit 330 of the present example including the shaft 51 that constitutes the main shaft of the spindle motor 304 has a circle formed at the end portion of the shaft portion 53 to have a larger diameter than the shaft portion 53. The shaft body 51 of the protruding piece 54 of the disc-shaped projection body supports the radial bearing 55 in the circumferential direction around the shaft body 51, and supports the thrust bearing of the protruding piece 54 provided at one end of the thrust direction of the shaft body 51. 58 and a housing 256 that supports the radial bearing 55 and the thrust bearing 58. The housing 256 is formed of a synthetic resin, and has a first storage support portion 910 that is formed by a cylindrical radial bearing 55. The second storage support portion 911 of the thrust bearing 58 and the protruding piece storage support portion 913»the second storage support portion 911 and the protruding piece storage support portion 9 1 3 which are collected by the protruding piece 54 of the shaft body 51 are formed continuously. The first storage support portion 9 1 0 is formed with an inner diameter smaller than the inner diameter of the second storage support portion 9 1 1 , and the inner diameter of the storage support portion 9 1 3 is the first storage support portion 910 and the second An intermediate inner diameter of each inner diameter of the collection support portion 911 is formed. As shown in Fig. 27, the first collection support portion 910 is housed and supported by a cylindrical radial bearing 55. In the second storage support portion 911, the disk-shaped thrust bearing 58 is supported by the storage. In the inner portion of the protruding piece storage portion 913, the protruding piece 54 of the shaft body 51 is housed in a state of being formed with a slight gap between the upper and lower sides and the outer periphery. The inner circumference of the outer casing 256 projects the inside of the outer casing 256 and the spacer 1000 is perforated throughout the circumference. Spacer 1 〇 〇0 is formed in the interval 1 - 39 - 1279062

The position between the support portion 9 10 and the second collection support portion 9 1 1 is collected. A shaft insertion hole 1 0 0 1 having a size sufficient to be inserted into the shaft portion 53 of the shaft body 5 1 is formed at the center portion of the spacer 1 0 0 0. As shown in FIG. 27, the shaft body 5 1 is inserted into the shaft insertion hole 1 0 0 1 and inserted into the bearing 55, so that the mounting portion 52 is provided in the upper closing portion 73. The shaft insertion hole 7 5 is protruded and disposed in the outer casing 256. At this time, the protruding piece 5 4 is located in the protruding piece holder 913, and the thrust bearing 58 is placed in the state of being placed in the collection portion 9 1 1 of the younger brother 2.

The inner peripheral surface of the radial bearing 55 that is rotated in the circumferential direction of the shaft body 51 of the first collection support portion 910 of the outer casing 256 is opposite to the circumferential portion of the shaft portion 53 as shown in Fig. 29 On the other hand, the first dynamic pressure generating grooves 261 and 262 are formed, and a pair of grooves 261a which are V-shaped on the inner circumferential surface of the radial bearing 55 are continuously formed by the connecting grooves 26 lb in the circumferential direction. The gravitational grooves are formed by the dynamic pressure generating grooves 261 and 262, and the tip end of the V-shaped pair of grooves 26U is also formed in the rotation direction R2 of the shaft body 51. In this example, the chain The first dynamic pressure generating grooves 261 and 2 62 are formed side by side in the axial direction of the cylindrical bearing 55.

Further, as shown in FIGS. 27 and 30, the second dynamic pressure is formed as shown in FIGS. 27 and 30, with the opening/pointing/paper disposed on the surface of the spacer 155 in the outer casing 256 of the casing 5 收藏. The second dynamic pressure generating groove 263 is generated, and as shown in FIG. 30, on the outer side of the door and the 隔J spacer 1 000, a pair of grooves 2 having a V shape will be formed. 6 3 a is in the circumferential & - finely formed by the connecting groove 263b as a herringbone groove pattern # 。 continuously formed in a ring shape. At this time, the second dynamic pressure generates the groove 2 6 3 to form a v-shaped makeup

The tip end of the pair of grooves 263a, 263a of w is formed by breaking the center of the rotation direction R J of the shaft body 5 1 . -40- 1279062

Further, the third dynamic pressure generating groove 264 is formed on a surface facing the protruding piece 54 of the shaft body 51 of the thrust bearing 58. As shown in FIGS. 28 and 29, the third dynamic pressure generating groove 264 is located on the outer periphery of the disk-shaped bearing "the pair of grooves 26 which are V-shaped" in the circumferential direction. The connection 1 groove 264b is formed as a herringbone groove formed continuously in a ring shape. The front end of the pair of grooves 264a and 264a forming the v-shape is formed in the rotation direction r2 of the shaft body 51.

The dynamic pressure generating grooves 261, 262, 263, and 264 of any one of the first to third, when the shaft body 51 is supported by the outer casing % by the radial bearing 55 and the thrust bearing 58, and is rotated by ▲ The flow of the lubricating oil 67 filled with the viscous fluid in the outer casing 56 is supported between the shaft body 51 and the radial bearing 55 and the thrust bearing 58 by the shaft body 51 that generates the dynamic pressure. That is, the radial bearing 55 and the thrust bearing 58 function as a dynamic pressure fluid bearing. The dynamic pressure generated by the rotation of the shaft 51 is such that the coefficient of friction between the shaft body 51 and the radial bearing 55 and the thrust bearing 58 is extremely small, so that the shaft 51 is smoothly rotated.

The outer casing 256 and the thrust bearing 58' constituting the bearing unit 306 of the present invention are formed by synthetic resin and the groove 263 is generated by the second dynamic pressure formed by the spacer ι and the thrust bearing The third dynamic pressure generating groove 264 formed at 58 can be formed integrally when the outer casing 256 and the thrust bearing are formed. Therefore, the second and third dynamic pressure generating grooves 263 and 264 can be formed. Since it can be molded by a plastic mold, it is easier to form than when a metal material is formed by cutting or the like. The bearing unit 3 3 0 ' of this example generates a groove for the second and third dynamic pressures of the lubricating oil 67. The concentration of the grooves 263, 264, and when the shaft 51 is rotated - 41 - (37) 1279062

To generate a stable dynamic pressure, ^ the gap between the spacer 1000 and the shaft 'best second ink-moving force generating groove 263 generates the interval between the protruding piece 54 of the groove 264 of the groove 51, and the third dynamic pressure The interval between the <& thrust bearing 58 and the protruding piece 54 of the shaft body 51 is reduced. A casing 256 constituting the radial bearing 5 5 7 early 30 3 0 in the housing body 271 body 271 by the state of the wide 1, the shaft body 51, the thrust bearing 58

Enough to form. In this way, the outer casing body 271 can be formed by external molding, and the outer casing body 271 can be formed by closing the bottom portion 272, for example, plastic 〇丄 〇丄 〇丄Mechanical assembly process and easy to manufacture. In Fig. 31, the manufacturing process of the bearing unit 33A of the present example will be described. The bearing sheet 70 3 3 0 of the present example is a shaft insertion step ST2 via a first resin outer molding step st, a thrust bearing insertion step ST3, a second resin outer molding step ST4, and a fueling step ST5. And the steps of the adjustment of the other lubricating and lubricating oils and the adjustment of the lubricating oil filling are manufactured.

In the first resin outer molding step ST1, the outer casing main body 271 is molded around the radial bearing 55. In order to obtain good lubrication in the thrust direction, it is necessary to ensure the concentricity of the annular third dynamic pressure generating groove 264 formed by the thrust bearing 58 and the shaft of the shaft body 51. The radial bearing 55 is housed and supported in the first storage support portion 910. The second dynamic pressure generating groove 263 of the spacer 1000 on which the outer casing 256 is formed is formed at the same time as the outer casing main body 271 at the time of external molding of the first resin, and is formed very easily. In the insertion step ST2 of the next shaft body 51, the second storage support portion 9 provided by the bearing 58 is pushed by the end - 42 - (38) 1279062 in the casing body 271 to form an open bottom portion. The shaft body 51 is inserted. At this time, the shaft body 51 causes the assembly portion 52 of the crucible 4 to protrude from the shaft insertion hole 75 that is not in the upper closing portion 73, and is disposed in the housing body from the state in which the secondary sheet 54 is positioned in the protruding piece storage portion 913. 271. In the insertion step ST3 of the next thrust bearing, the second storage holding portion 9U is provided. The push wheel bearing 58 is inserted in the second resin outer molding step ST4, since the outer side of the sleeve member 58 is externally molded, and the synthetic resin material is externally molded to form a bottom closed 呷 π] =! Γ 256, the thrust bearing 58 It is fixed in the second housing 256 of the second collection (four). ,. Then, in the refueling step ST5, the lubricating oil is filled outside =: the outer casing 256' except the shaft insertion 5 formed in the upper closing portion 73, the shaft portion 53, the protruding piece 54, the radial bearing of the shaft body 51 The thrust bearing 58 is enclosed and integrally maintained. , the bearing unit 33G used in the example of the thrust bearing Μ, is tied to the Ge

, S s, sintered metal material is produced in units of several μηι, K pressure, cover, and the size of the movable groove 264 is stamped, rolled, etched, etc., due to 1 «sighing Material. When the thrust bearing 58 is also formed of a synthetic resin, it is possible to provide a crucible because the dynamic pressure generating groove of the resin molding 264, m LV , is easy to manufacture, and the manufacturing cost can be reduced. The synthetic resin forming the thrust bearing 58 causes the squat of the dragon or the like to be in contact with the thrust bearing 58 of the shaft of the shaft body 5 1 after the rotation of the lubricity of the shaft J. And can form a highly reliable bearing unit. Old _, as shown in Fig. 26 and Fig. 27, the bearing unit 33 〇 can also be used as shown in Fig. ι 9 -43-1279062 (39) and Fig. 20. The second and/or third dynamic pressure of the protruding piece 354 generates the shaft body 351 of the grooves 363 and 364. At this time, neither or either of the spacers 1,000 of the outer casing 256 and the thrust bearing 58 become unnecessary. The dynamic pressure generating groove is provided. As a result, the manufacture of the outer casing 256 or the thrust bearing 58 used becomes easy. The above bearing unit relating to the present invention has the maximum outer dimensions of the radial bearing and the outer dimensions of the protruding piece provided on the shaft body. Satisfactoryly about the same, and relatively small radial bearings and protruding pieces are used. Therefore, the outer dimensions of the outer casing itself can be reduced. ί Although the outer dimensions of the thrust bearing become the protruding pieces and radial bearings of the shaft body The maximum size is slightly larger, but it should stop The portion of the outer diameter of the push bearing is absorbed in the thickness of the outer diameter of the outer casing, so that the outer shape of the outer casing does not become large. The bearing unit of any of the above examples of the present invention is provided in the upper part. The outer casing is closed except that a part of the shaft insertion hole portion through which the shaft body of the closing portion is inserted is closed. That is, since it is only sufficient to prevent the shaft insertion hole portion from being filled into the outer casing. Since the gap in which the lubricating oil of the fluid leaks is formed, and the other is sealed, it is possible to form a bearing unit having high reliability and a high reliability such as leakage of lubricating oil in the casing to the outside or scattering, and a motor having the bearing unit. To prevent leakage or scattering of lubricating oil, it is possible to prevent fouling and reliable protection of the hard disk machine when applied to the spindle motor of the disk drive device. Furthermore, the bearing unit to which the present invention is applied can be used for the shaft body. The radial direction and the thrust direction are maintained by the structure of all dynamic pressure bearing support. -44 - (40) (40) The first-class horse of the measuring pole can be stable to the shell. The viscous species of the horses are confirmed to be driven by the main shafts of the shafts, and the seeding machines or the biasable refillable discs are prepared by the magnetic horses. Use the order to stop the drive and use it to make the bearing machine have a suitable hot shaft. The disc can be dismissed for the magnetic effect, and it is the cause of the rubbing. If it is, the speed element is low. And the order is transferred, but the oil sheet is also often high-bearing, sliding bearing, non-sliding shaft for the shaft oil-lubricated bearing. The structure of the rotation is suitable for the use of the shaft. , Decent! This is the transfer of the transferee's flow table to the axis of the shaft, the loss of rotation is repetitive. The main damage is the bond body up to 1279062. Further, the bearing unit of the present invention, and It is not limited to a motor, and can be widely used for a mechanism that includes a mechanism for rotating a shaft and a member that rotates the shaft to the shaft. INDUSTRIAL APPLICABILITY As described above, the present invention can reliably generate a dynamic pressure when the shaft body is rotated to generate a dynamic pressure and can generate a stable dynamic pressure, so that the shaft body or the member supported by the shaft body can be smoothly stabilized. The rotation. In particular, the invention is

It is useful to reduce the frictional resistance of the shaft when it is rotated. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a bearing unit previously used. Figure 2 is a plan view showing a disk drive driving device of a data storage reading device which is a motor using a bearing unit related to the present invention

-45. 1279062

(41) An example that applies. Fig. 3 is an exploded perspective view showing the internal mechanism of the disk drive device shown in Fig. 2.

Fig. 4 is a more detailed exploded perspective view showing the internal mechanism of the disk drive device shown in Fig. 2. Fig. 5 is a cross-sectional view showing a spindle motor in a state in which a bearing unit according to the present invention is assembled in a stator.

Figure 6 is a longitudinal sectional view showing a bearing unit relating to the present invention. Fig. 7 is a perspective view showing a dynamic pressure generating groove formed on the inner peripheral surface of the radial bearing. Fig. 8 is a perspective view showing a radial bearing formed by a dynamic pressure generating groove on one end surface. Fig. 9 is a perspective view showing a thrust bearing formed by a dynamic pressure generating groove.

Fig. 10 is a perspective view showing a gap formed by the outer peripheral surface of the rotary shaft and the inner peripheral surface of the shaft insertion hole provided in the outer casing. Fig. 1 is a longitudinal sectional view showing another example of the bearing unit of the present invention. Fig. 1 is a cross-sectional view showing a state in which a radial bearing, a thrust bearing, and a spacer member which are used in combination with the bearing unit of Fig. 11 are combined. Fig. 1 is a longitudinal sectional view showing still another example of the bearing unit of the present invention. Fig. 14 is a longitudinal sectional view showing still another example of the bearing unit of the present invention. -46- 1279062 42) The sub-examples of his other single-segment bearing shafts are shown. Table diagram The section of the section 15 is shown to the vertical section. The surface of the table is 6 J 1it, the closed view of the longitudinal section of the longitudinal section is formed into a plastic bearing shaft, and the outer casing is externally placed. The outer diameter of the bearing shell is shown in the opposite direction. The figure 1 of the system diagram B is shown as 17 , and the outer section of the drawing diagram is formed into a single piece of the body axis of the 8 J 1 element of the model. The groove productivity of the body axis of the protrusion and the axis diagram is set on the surface of the display system 9 11 . The bottom of the groove is formed by the groove. Partial perspective view of the shaft of the system 2. Fig. 2 is a cross-sectional view showing the spindle motor in a state in which the bearing unit is positioned in the stator and assembled. Fig. 2 is a perspective view showing a bearing unit in which a catching portion is provided as an assembling means for positioning and assembling the stator of the spindle motor. Fig. 23 is a cross-sectional view showing a spindle motor using a fixed shaft body and a bearing unit which is rotatable on the outer casing side. Fig. 24 is a cross-sectional view showing a spindle motor using a bearing unit having an electrostatic discharge function. Fig. 2 is a cross-sectional view showing a bearing unit having an electrostatic discharge function. Fig. 26 is a sectional view showing a spindle motor using a bearing unit relating to the present invention. -47- 1279062

(43) Fig. 2 is a cross-sectional view showing a bearing unit using another example of the spindle motor shown in Fig. 26. Fig. 2 is a perspective view showing the explosion of the bearing unit using the outer casing provided with the spacer. Figure 2 is an exploded perspective view of the bearing unit shown by cutting the radial bearing. Figure 30 is a perspective view showing a spacer provided on the outer casing.

Fig. 3 is a process diagram showing a structure in which a shaft body is assembled to a casing provided with a spacer and a bearing unit is produced. Schema representation symbolic description

2,2a,2b Case 3 Hard disk drive 4,1 14,204,214,304 Spindle motor 5 Magnetic head 6 Rotary transmission 7 Magnetic head support arm 8 Voice coil 9 Magnet 14 Circuit board 11 Support shaft 12 Connection terminal 13 System LSI (large integrated circuit) 14 circuit board 15, 1 15 rotor 16, 1 16 stator - 48 · 1279062 (44) 17 turntable 18 holding member 19 rotor magnet 20, 120 rotor housing 21, 121 stator housing 22, 222 driving coil 23 core 25 control circuit unit 26, 154 mating hole 28, 82 cylindrical portion 28a hook 3〇, 80, 91, 101, 130, 160, bearing unit 230, 300, 330, 1060 51, 35 1, 1061 axle body 52 mounting part 53, 3 5 3, 1068 shaft part 54, 3 54, 1069 protruding piece 55, 94, 1 55, 1062 radial bearing 56, 86, 1 56, 256, 1064 housing 58, 1063 thrust bearing 61a, 63a, 6 4a, 261a,: 2 6 1 b, grooves 263a, 264a, 3 63 a, 364a 61, 62, 261, 262, 63, 1062a, first dynamic pressure generating grooves 63, 263, 363,1062b 2nd dynamic pressure generating groove 1279062 (45)

63b, 64b, 261b, 263b, 363b, 364b 64, 264, 364 65, 81, 95, 102, 111 66 67, 157 71, 271 72, 272 73 75,1 0 0 1, 1 067 77 79, 1070 83 90 103 264b, 3rd dynamic pressure generating groove spacing member external electrode lubricating oil housing body bottom closing portion upper closing portion shaft insertion hole taper portion gap annular sleeve partial assembly through hole

104 13 1 132 152 153 355 155 910 91 1

Protruding section difference part Riveting part Mounting hole Coil assembly part Combination groove part Mating part First collection support part Second collection support part -50- 1279062 (46)

913 1000 1065 1066 1071, 1072 Tabs Collection Supports Spacers Covers Sealing Members Connections

-51-

Claims (1)

I would like to ask the members to express whether this case is changed in the original essence g 1279|) 绍124434 Patent application Chinese application patent scope replacement (May 1993) Pick up, apply for patent scope 1 · A bearing unit, which has: a shaft body having a circular cross section and a shaft body of a disc-shaped projecting body having a larger diameter than the shaft portion provided at one end of the shaft portion, and a bearing for circumferentially supporting the shaft body, facing the protruding body a thrust bearing disposed at one end of the thrust body of the shaft body, a radial bearing supporting the shaft body and the thrust bearing disposed inside, filled with a viscous fluid, and the shaft inserted except the shaft body a housing that is sealed outside the insertion hole and a spacer member that is disposed inside the housing to maintain an interval between an end surface of the radial bearing and a surface of the protrusion; and a tip of the protrusion and the radial bearing a moving pressure generating portion that generates a dynamic pressure derived from the viscous fluid is formed on either one of the facing side surface or the end surface of the thrust bearing facing the other side; Any one of a surface of the thrust bearing facing the other side of the protruding body or a surface facing the other side of the protruding body is formed with a dynamic pressure generating portion that generates a dynamic pressure derived from the viscous fluid. The outer casing is integrally formed by a molded body of a synthetic resin. 2. The bearing unit according to claim 1, wherein a third dynamic pressure generating portion that generates a dynamic pressure derived from the viscous fluid is formed on an inner circumferential surface of the radial bearing that faces the shaft portion. . 3. The bearing unit according to item 1 of the patent application, wherein the above-mentioned shaft body The gap formed between the inner peripheral surface of the shaft insertion hole and the inner peripheral surface of the shaft insertion hole is sufficient to prevent leakage of the viscous fluid filled in the outer casing from the outer casing. 4. The bearing unit according to the first aspect of the invention, wherein the inner circumferential surface of the shaft insertion hole or the outer circumferential surface of the shaft portion of the shaft body facing the inner circumference is formed on one surface The gap formed between the outer peripheral surface of the shaft portion and the inner peripheral surface of the shaft insertion hole is formed into an inclined tapered portion which is expanded to the outer surface of the outer casing. 5. The bearing unit according to claim 1, wherein the viscous fluid is filled into the outer casing to form at least between an outer circumferential surface of the shaft body and an inner circumferential surface of the shaft insertion hole. Inside the gap. 6. The bearing unit according to claim 1, wherein the spacer member has a cylindrical portion fixed to an inner circumferential surface of the outer casing, and is formed integrally with the cylindrical portion and protrudes in a radial direction of the cylindrical portion The inner annular sleeve. 7. The bearing unit according to claim 1, wherein a part of the cylindrical portion of the spacer member is exposed to the outer cymbal via the hole of the outer casing. The bearing unit according to claim 1 of the patent scope, wherein The radial bearing and the spacer member are integrally formed. 9. The bearing unit of claim 1, wherein the outer casing and the spacing member are integrally formed. A bearing unit according to the first aspect of the invention, wherein the shaft system is rotatably coupled to the rotating shaft of the branch body by the radial bearing and the thrust bearing relative to the outer casing. Mwmii 1 1. The bearing unit according to the first aspect of the invention, wherein the shaft system is fixed to a shaft body, and the outer casing is rotatable relative to the outer casing via the radial bearing and the thrust bearing. A bearing unit according to the first aspect of the invention, wherein the end side portion of the above-mentioned thrust bearing arrangement side of the outer casing is formed of a synthetic resin and is made of synthetic resin provided with the radial bearing The formed shell body is welded and integrated. A bearing unit according to item 12 of the patent application, wherein the welding is ultrasonic welding. [1] The bearing unit according to Item 1, wherein the end side portion of the above-mentioned thrust bearing arrangement side of the outer casing is formed by an outer casing body provided with the radial bearing, and the above The housing body is integrated. 1 . The bearing unit according to claim 14 , wherein an end side portion of the above-mentioned thrust bearing arrangement side of the outer casing is formed by a heat resistant temperature of a casing body to which the radial bearing is disposed The lower synthetic resin is integrated with the above casing body. The bearing unit according to claim 1, wherein the radial bearing is formed by a sintered metal. The bearing unit according to the first aspect of the invention, wherein the protruding body is formed of a synthetic resin and is integrally assembled to the shaft portion made of metal. The bearing unit according to claim 1, wherein the protruding body is formed of a sintered metal and is integrally assembled to the above-mentioned shaft made of metal unit. The bearing unit according to claim 1, wherein the outer casing has a fixing mechanism for mechanically fixing the assembly target portion to be assembled to the outer casing. The bearing unit according to claim 1, wherein the shaft body, the viscous fluid, the radial bearing, and the outer casing form a discharge path toward the outside of the casing. A bearing unit according to claim 20, wherein at least a portion of the shaft body and the radial bearing are formed of metal. 2 2. A bearing unit according to item 20 of the patent application, wherein the outer casing is formed by a synthetic resin having electrical conductivity. 2 3. The bearing unit according to claim 20, wherein the electrically conductive material is mixed with the viscous fluid. The bearing unit according to claim 20, wherein the outer casing is formed of a synthetic resin, and at least a portion of the discharge member is provided continuously over the inner and outer circumferences. A bearing unit comprising: a shaft portion having a circular cross section; and a shaft body of a disc-shaped projecting body having a larger diameter than the shaft portion provided at one end of the shaft portion; a circumferentially supported bearing, a thrust bearing disposed to the protruding body and supporting one end of the shaft body in the thrust direction, a radial bearing supporting the shaft body and the thrust bearing disposed inside, filled with a viscous fluid And in addition to the above-mentioned shaft inserted through the shaft inserted into the new year a casing that is sealed outside the hole; the casing is provided with a first storage holding portion that is held by the radial bearing, and a second storage holding portion that holds the thrust bearing and holds the radial bearing and the thrust a protrusion collecting portion that rotatably collects the protruding body of the shaft body formed between the bearings, and a spacer that separates the position of the first storage holding portion and the protruding body collecting portion, and the spacer and the spacer a surface of the shaft body facing the protrusion or a surface of the protrusion facing the spacer, wherein a dynamic pressure generating portion that generates a dynamic pressure from the viscous fluid is formed; The end side portion of the thrust bearing arrangement side is formed of synthetic resin and is welded and integrated with the outer casing body made of synthetic resin in which the radial bearing is disposed. The bearing unit according to claim 25, wherein the inner peripheral surface of the radial bearing facing the shaft portion is formed with a dynamic pressure generating portion that generates a dynamic pressure derived from the viscous fluid. The bearing unit of claim 25, wherein the surface of the thrust bearing opposite to the protrusion or the surface of the protrusion facing the thrust bearing is formed to have a origin a dynamic pressure generating portion of the dynamic pressure of the viscous fluid. 2 . The bearing unit according to claim 25, wherein a gap formed between the shaft body and an inner circumferential surface of the shaft insertion hole is configured to prevent self-adhesion of the viscous fluid filled in the outer casing Leakage of the outer casing. 2 9. According to the bearing unit of the 25th item of the patent application, wherein the above-mentioned shaft system is i! month I-7 A123⁄4, one can be said to be on the opposite side of the bearing shaft, and C ί 2 The direction of the direction of the direction of the special support to the upper part of the application to the base of the axis can be based on the axis of the axis of the axis of the system, the description of the axis and the axial direction of the Rotating, the corresponding bearing shaft of the outer shaft pair of the casing is melted by the shell of the pusher. The above is the upper part of the shaft. The ff element is the main bearing shaft of the shaft. 5 5 2 2 The first perimeter Tnj. o runj. The spear spear specializes, please apply the support of the outer surface of the outer shell of the root body of the roots of the roots of the roots. The motor has a bearing unit that rotatably supports the rotor for the stator; the bearing unit has: a bearing unit having: Circular shaft section And a shaft body of a disc-shaped projecting body having a larger diameter than the shaft portion provided at one end of the shaft portion, and a bearing of the shaft body circumferential branch is disposed, and the shaft body is disposed to support the shaft body a thrust bearing at one end of the thrust direction, a radial bearing supporting the shaft body and the thrust bearing disposed inside, filled with a viscous fluid, and sealed in addition to the shaft insertion hole through which the shaft body is inserted An outer casing and an inner end of the outer casing and the end surface of the radial bearing a spacer member that maintains a space between the faces on one side of the protrusion; and a first dynamic pressure generation that generates a dynamic pressure due to the viscous fluid is formed on an end surface of the radial bearing facing the one side of the protrusion a second dynamic pressure generating portion that generates a dynamic pressure derived from the viscous fluid is formed on a surface facing the one side of the protruding body of the thrust bearing, and the outer casing is formed of a synthetic resin. One piece is formed. 3. The motor of claim 3, wherein the inner peripheral surface facing the shaft portion of the radial bearing is formed with a third dynamic pressure generating portion that generates a dynamic pressure derived from the viscous fluid. The motor according to the third aspect of the patent application, wherein the gap formed between the shaft body and the inner peripheral surface of the shaft insertion hole is sufficient to prevent the viscous fluid filled in the outer casing from the outer casing. leakage. The motor according to the third aspect of the invention, wherein the inner circumferential surface of the shaft insertion hole or the outer circumferential surface of the shaft portion of the shaft body facing the inner circumference is formed on one surface An inclined tapered portion in which a gap formed between the outer peripheral surface of the shaft portion and the inner peripheral surface of the shaft insertion hole is expanded toward the outer surface of the outer casing. The motor of claim 3, wherein the viscous fluid is filled into the outer casing to form at least between an outer circumferential surface of the shaft body and an inner circumferential surface of the shaft insertion hole. Within the gap. The motor according to the third aspect of the invention, wherein the spacer member has a cylindrical portion fixed to an inner circumferential surface of the outer casing, and the cylinder The annular sleeve which is integrally formed and protrudes inward in the radial direction of the cylindrical portion. According to a third aspect of the invention, the rotor is assembled to the shaft body and rotates integrally with the shaft body. 40. The motor of claim 33, wherein the rotor is supported by the outer casing and rotates integrally with the outer casing. 4 1 . A motor including a bearing unit that rotatably supports a rotor for a stator; and the bearing unit includes: a shaft portion provided to have a circular cross section and an end portion provided on the shaft portion A shaft body of a disk-shaped projecting body having a large diameter of a shaft portion supports a radial bearing in a circumferential direction of the shaft body, and is disposed to the protruding body and supports a thrust end of the shaft body in a thrust direction The bearing, the radial bearing supporting the shaft body and the thrust bearing are disposed inside, and are filled with a viscous fluid, and the outer casing is a closed structure except for the shaft insertion hole through which the shaft body is inserted. a first storage holding portion that holds the radial bearing and holds the second storage holding portion that is held by the thrust bearing, and a protrusion of the shaft body formed between the radial bearing and the thrust bearing a slidably-collecting protrusion collecting portion, a spacer that separates a position between the first storage holding portion and the protruding body collecting portion, and a surface that faces the protruding body of the spacer of the spacer There are dynamic pressure is generated in the origin of the viscous fluid dynamic pressure generating portion; The end portion side portion of the above-described thrust bearing arrangement side of the outer casing is formed of a synthetic resin, and is welded and integrated with a casing body made of a synthetic resin in which the radial bearing is disposed. The motor according to the fourth aspect of the invention, wherein the inner peripheral surface facing the shaft portion of the radial bearing is formed with a dynamic pressure generating portion that generates a dynamic pressure derived from the viscous fluid. 43. The motor according to claim 41, wherein the thrust shaft is A moving pressure generating portion that generates a dynamic pressure derived from the viscous fluid is formed on the surface on which the projections are opposed. -9-