Abstract: The object of the present invention is to provide a spindle motor having a sealing means which can easily be assembled into the motor, a sufficient sealing effect can be obtained thereby, and the cost for machining and molding parts of the sealing means can be reduced.

Abstract: A spindle motor is formed so as to support a pivot of a rotor by a pair of open bearings.

Abstract: The inner ring 2 and the outer ring 3 of the roller bearing 1 as element are formed with silicate glass such as a high silicate glass, a soda-lime glass, aluminosilicate glass, borosilicate glass and an alkali silicate glass, during its manufacturing processes a heat treatment is carried out for making the silicate glass polycrystalized and the thermal expansion coefficient of the inner ring 2 and the outer ring 3 diminished to prevent them from being changed minutely in dimension and the hardness and the strength of the rolling surfaces 2a, 3a increased to diminish the revolution vibration and the revolution noise due to the revolution vibration and prevent the impact due to miniaturization of the apparatus from being generated.

Abstract: A double seal bearing includes a labyrinth seal mechanism. The double seal bearing is provided with a pair of annular inner and outer sealing plates having respective central openings with a remaining slight clearance between each respective sealing plate and one of the inner and outer races, respectively, so as to assure the labyrinth seal function.

Abstract: A pivot bearing assembly comprises a shaft having a main body portion and a reduced portion integrally and coaxially formed therewith, an outer ring-sleeve member coaxially surrounding the shaft, a first bearing arranged between the reduced portion of the shaft and the outer ring-sleeve member, a second bearing arranged between the main body portion of the shaft and the outer ring-sleeve member and a tolerance ring mounted on the outer peripheral surface of the outer ring-sleeve member. The inner ring of the second bearing is a part of the main body portion of the shaft. The outer ring-sleeve member can comprise an outer ring and a sleeve tightly mounted on the outer ring or an outer ring portion and a sleeve portion surrounding the outer ring and integrally formed therewith.

Abstract: A single-piece outer race ring 3, a sleeve-like spacer 11, a plurality of first balls 4, a conventional ball bearing unit 7, a stepped-diameter shaft 1 and the like are assembled into a compound bearing assembly by a bearing maker with high accuracy to enable a user to be free from a cumbersome assembling work of rotating portions or cylindrical rotary shaft and its bearing means of a computer and its peripheral devices. In use, the compound bearing assembly is coaxially mounted in the cylindrical rotary shaft and the like at the user's end to rotatably support the cylindrical rotary shaft and the like in the computer and its peripheral devices.

Abstract: A bearing comprising a metal base body corresponding to a whole or a part of elements of the bearing with a polycrystallized glass layer located on the metal base body, and a method comprising forming a whole or a part of elements of a bearing with molten glass or of a base metal with a laminated glass layer and carrying out a heat treatment for polycrystallizing the glass.

Abstract: The object of tho present invention is to provide a hard disk drive device having a bearing means of larger size and sufficient strength, improved impact resistance, high accuracy of rotation, and high reliabililty

Abstract: A spindle motor including a bearing means which is not seized under the high speed rotational operation and with reduced fretting wear. Consequently, the densification of the hard disk drive device can be achieved.

Abstract: The object of the present invention is to provide a blower including a bearing structure wherein the number of components is reduced, the cost for manufacturing can be reduced, and the diameter of the shaft can be increased. The bearing structure is good at its durability, eliminates or reduces the rotational run out, and provides superior quietness.

Abstract: A compound bearing apparatus including a shaft, a cylindrical outer ring member surrounding the shaft, and a plurality of balls of the first and the second rows interposed between the shaft and the outer ring member is provided.

Abstract: The object of the present invention is to provide a double seal bearing including a labyrinth seal mechanism.

Abstract: A bearing apparatus including inner and outer rings and balls interposed therebetween, the apparatus being characterized in that it comprises:

Abstract: The object of the present invention is to provide a blower in which electrical components such as printed circuit board or electronic parts are isolated from the wind flowing through the blower to protect these components from moisture, dirt, dusts, or other harmful gas or substance contained in the wind, and to prevent the degradation of the insulating property such as the electric insulation or dielectric strength.

Abstract: A heat sink provided with a heat conducting section 8 having a heat absorbing surface in contact with the heat emitting component, and fins 10 formed by being projected from the said heat conducting section 8, said fins 10 having air holes 11, and heat conducting section 8 being provided with clamps 7 for fixing to the heat emitting component.

Abstract: The object of the present invention is to provide a motor, or spindle motor in which only an assembling operation of a completed compound bearing with the motor may be effected on the side of motor maker, the number of steps required for assembling can be reduced because the assembling operation of the bearing is not necessary, the precision of the rotation of the motor is high, the cost for fabrication can be reduced, the resistance against impact and/or resonance is high since the diameter of the shaft can be enlarged.

Abstract: The object of the present invention is to provide a hard disk drive device having a bearing means of larger size and sufficient strength, improved impact resistance, high accuracy of rotation, and high reliability.

Abstract: A spindle motor of the present invention is capable of keeping its ball (5a, 5b)'s pre-load constant, because a sleeve (6) is capable of being resiliently deformed due to its resiliency, and therefore capable of constantly keeping a pre-load applied to the balls (5a, 5b) from inner and inner ring raceways of inner and outer rings (3a, 4a, 3b, 4b) of ball bearings (3, 4). In this motor, a rotor hub (7) has an axial center bore (8). This bore (8) is provided with: a large-diameter bore portions in its opposite axial ends; and, a small-diameter bore portion (8a) axially interposed between the large-diameter bore portions. An inner diameter of the small-diameter bore portion (8a) is smaller than an outer diameter of the sleeve (6).

Abstract: The ball rolling surfaces 11 and 12 of the pocket 7 holding the ball 5 are set in the two spherical surfaces which have a radius larger than the one of the ball 5 and the centers of which are deflected at an equal space from the center of the pocket on the pitch circle of the pocket disposing, and on the inside portions from the edge 9a of the width direction of the pocket and the edge 9b of the height direction of the pocket the contact portions 14 and 15 where the rolling surfaces of the balls and the balls which are positioned at the displacing end contact to form the gaps 16 and 17 on the area determined from the contact portions 14 and 15 to the edge side and make the lubricant G entered through the gaps 16 and 17 into the ball rolling surfaces 11 and 12.

Abstract: The object of the present invention is to provide a spindle motor of high accuracy of rotation irrespective of the temperature differential for driving the hard disk or disks of the hard disk drive device. A spindle motor including a shaft secured on a base to extend vertically therefrom, and a rotor hub journalled rotatably around the shaft through a plurality of anti-friction bearings each of which has outer and inner races and rotational bodies disposed between races, characterized in that a cylindrical sleeve having a through bore is disposed between outer peripheral surface of each anti-friction bearing and an inner peripheral surface of a central bore provided through the rotor hub, the sleeve and the outer races of the anti-friction bearings are made of the ferrous metal material of substantially the same coefficient of expansion, and the inner races of anti-friction bearings and the shaft are also made of the ferrous metal material of substantially the same coefficient of expansion.