Abstract: Between rotation shaft 1a and the frame 4, two bearings 5 having inner races 5b narrower in width compared with outer races 5a are disposed and each of end faces of outer races 5a is made to abut each other. Since in general, the outer race and the inner race are secured in the size precision, by making each end faces of the outer race to abut each other, an assembling precision between two bearings 5 is secured. Further, spacing secured between inner races 5b enables to displace the inner ring 5b minutely due to the preload to be given to the end face of the inner races 5b at the time of assembling of the spindle motor, which is expected to absorb a minute play inevitable to the bearings, as a result to increase the rotation precision after completion of the spindle motor.

Abstract: A compound bearing assembly for a swing arm is disclosed, which comprises a stepped shaft 1 having a large-diameter portion 1a and a small-diameter portion 1b, the large-diameter portion 1a having an inner raceway groove 2a directly formed in the inner periphery, a sleeve-like outer race ring 5 surrounding the stepped shaft 1 and having a distinct-member outer race ring 3 provided adjacent one end and also having an outer raceway groove directly formed in the inner periphery of a portion adjacent the outer end, a plurality of balls 4 provided between the inner raceway groove 2a directly formed in the large-diameter portion 1a and an outer raceway groove 2a formed in the distinct-member outer race ring 3, and a plurality of other balls 8a provided between an inner raceway groove formed in an inner race ring 7a fitted on the small-diameter portion 1b of the stepped shaft 1 and the outer raceway groove 2b directly formed in the inner periphery of the sleeve-like outer race ring 5.

Abstract: A spindle motor including a double row bearing apparatus 2 for supporting a rotor hub 9 rotatably on a base 1. A labyrinth seal mechanism is incorporated into the bearing apparatus. The double row bearing apparatus includes a two-stepped shaft 3 and a pair of rows of rotating bodies 5a and 5b interposed between the shaft and a sleeve outer race 4 surrounding the shaft. A pair of inner and outer sealing plates 13a and 13b are provided between the spacing defined between the sleeve outer race and the inner race fitted around the reduced diameter portion of the shaft to form a labyrinth seal. A pair of inner and outer sealing plates 14a and 14b are also provided between the sleeve outer race and the inner race fitted around the enlarged diameter shaft portion to form a labyrinth seal. Thus, there is no necessity for the manufacturer of the motor to incorporate the additional sealing mechanism into the motor.

Abstract: A composite bearing which provides an outer ring and an inner ring arranged coaxially to provide a gap relatively fixed to one of the opposing parts of the bearing, ball grooves in the opposing surfaces of said inner ring and outer ring, balls which can rotate freely in said grooves, the bearing being arranged on outer ring and inner ring and balls, but at least on one side of balls, which is cylindrically-shaped and has an outer surface fixed to an outer ring sleeve, and an internal surface having a bearing part (inner ring) and a friction bearing which maintains gap g to within the specified value for the permitted range of inclination for inner ring and outer ring.

Abstract: A drive unit has improved precision and requires fewer manufacturing steps than the prior art. The drive unit comprises a base plate 1 having a predetermined shape in cross-section so as to form a pair of frame portions 2 in its opposite sides. The plate 1 is made of metal, formed by using an extrusion process, and provided with: a concave portion 4 with a central hole 3a through which a motor M is mounted on the plate 1; and, a mounting hole 3c through which a swing arm is mounted on the plate 1. The motor M has its spindle 5 mounted in the central hole 3a of the plate 1 in an insertion manner. The swing arm 6 has its base portion supported by a pivot 8 through a pair of ball bearings 7. The pivot 8 is mounted on the plate 1 through the mounting hole 3c in an insertion manner.

Abstract: A present invention is to provide a thin parts installation structure and their manufacturing method. There is provided a circuit on a wiring substrate, an adhesive is painted to a selected part installation position on the wiring substrate, a conductive adhesive is painted in a position where the terminal area of electronic parts contact the wiring pattern circuits. The electronic part is put in the selected position of wiring the substrate such that the terminals of the electronic parts contact the conductive adhesive prior to curing the adhesives, and followed by both the non-conductive adhesive and conductive adhesive are stiffened.

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 compound bearing apparatus of the present invention comprising a shaft, a sleeve outer ring surrounding the shaft, two rows of rotating bodies disposed between the shaft and the sleeve including a first row of the rotating bodies interposed between an outer rolling contact recess formed directly on the outer periphery of the shaft and a first inner rolling contact recess formed on the inner peripheral surface of the sleeve outer ring, and a second row of the rotating bodies interposed between an outer rolling contact recess formed on the outer periphery of an inner ring fitted onto the shaft and a second inner rolling contact recess formed on the inner peripheral surface of the sleeve, and a pair of inner and outer sealing plates having a through hole at the central portion thereof; wherein at the one side of the apparatus where the first row of the rotating bodies is provided, the sealing plates are mounted between the sleeve outer ring and the shaft with leaving between the plates and the sleeve outer rin

Abstract: A magnetic disk unit of the present invention has a construction in which: a rotor, on which a magnetic disk is loaded, is integrally formed with a sleeve portion of a ball bearing unit, or with a spindle of a spindle motor for driving the disk, or with an inner or an outer race of the ball bearing unit in a disk drive unit of the magnetic disk unit, so that: alignment operations of the rotor with the ball bearing unit are eliminated in assembling operations of the magnetic disk unit; and, the rotor is free from radial vibrations to improve the disk in recording density and reliability, whereby the number of parts of the magnetic disk unit and the number of assembling operation or steps of the magnetic disk unit are reduced, which leads to reduction of the manufacturing cost of the magnetic disk unit.

Abstract: A compound ball bearing comprises a bearing assembly including a spindle 1, a sleeve 2 surrounding the spindle 1, and an inner ring 6 fitted on the spindle or an outer ring fitted in the sleeve, and balls 5, 9 provided between the spindle 1 and the sleeve 2, between the spindle and outer ring or between the inner ring 6 and sleeve 2. A base 16 of a motor is formed as a one-piece unit with the spindle. The vibration accuracy of the spindle 1 can be improved.

Abstract: A compound ball bearing type pulley comprises a bearing assembly including a spindle 1, a sleeve 2 surrounding the spindle 1 with outer flanges 22a, 22b formed on upper and lower ends of the sleeve and an inner ring fitted on the spindle. Balls 5, 9 are provided and between the spindle 1 and sleeve 2, between the inner ring 6 and sleeve 2. Conventional outer rings are not necessary and the outer diameter of the pulley can be made smaller.

Abstract: A compound bearing assembly for a swing arm of a hard disc drive is disclosed, which comprises a stepped shaft 1 having a large-diameter portion and a small-diameter portion 1b, the large-diameter portion 1a having an inner raceway groove 2a directly formed in the outer periphery, a distinct-component outer race ring 3 disposed around the large-diameter portion 1a and having an outer raceway groove 2b formed in the inner periphery, a plurality of balls provided between the inner and outer raceway grooves 2a and 2b, a ball bearing unit 5 having an inner and an outer race ring 5a and 5b and a plurality of balls 6 provided therebetween, the inner race ring 5a being fitted on the small-diameter portion 1b of the stepped shaft, and a sleeve-like spacer 1 between the distinct-component outer race ring 3 and the outer race ring 5b of the ball bearing unit 5 and having opposite end small-diameter portions, on which the outer race rings 3 and 5b are fitted, respectively.

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 miniature inner rotor type of rotary machine having a high durability and anti-vibration property, includes a double row bearing apparatus (2) and comprises a stepped shaft (10). The shaft has a larger diameter shaft portion (10a) around which an inner rolling contact recess (11a) is formed and a reduced diameter shaft portion (10b), a first outer race (12), first balls (13) interposed between the large diameter shaft portion and the first outer race, and a ball bearing (17) comprising an inner race (14) to be fitted over the reduced diameter shaft portion (10b), a second outer race (15), and second balls (16) to be interposed between the inner race (14) and the second outer race (15).

Abstract: A double row bearing apparatus comprises a stepped shaft having larger and smaller diameter shaft portions, an inner race way groove provided on the outer peripheral surface of the larger diameter portion, balls interposed between the inner race way groove and an outer race way groove formed on an inner surface of an outer race surrounding the larger diameter portion, and a ball bearing including inner and outer races and balls interposed therebetween, wherein the ball bearing is fitted removably at its inner race over the smaller diameter portion of the stepped shaft.

Abstract: The object of the present invention is to provide a vibration-proof miniature motor of high endurance including a compact enough double row bearing apparatus having a shaft of sufficient mechanical rigidity.

Abstract: The object of the present invention is to provide a hard disk drive device including a compact enough double row bearing apparatus having a shaft of sufficient mechanical rigidity.In accordance with the present invention, A hard disk drive device comprising a double row bearing apparatus, including a stepped shaft having larger and smaller diameter shaft portions, an inner race way groove provided on the outer peripheral surface of the larger diameter portion, balls interposed between the inner race way groove and an outer race way groove formed on an inner surface of an outer race surrounding the larger diameter portion, and a ball bearing including inner and outer races and balls interposed therebetween. The ball bearing is fitted at its inner race over the smaller diameter portion of the shaft, and the lower end of said larger diameter shaft portion of the double row bearing apparatus is installed and secured on a base of the hard disk drive device.

Abstract: A ball bearing for a small size fan for supporting an axis of rotation of an impeller is formed of four or five balls (21), a crown-shaped cage (25), an inner ring (22), and an outer ring (23). By using an optimized number of the balls (21) under the working condition of a ball bearing for a small size fan, structually useless portions are eliminated. Further, by adopting the crown-shaped cage (25), reduction of the cost and the friction torque is attained, and a ball bearing having necessary and sufficinet durability is provided. By incorporating the ball bearing in a small size fan, reduction of the cost, simplification of the structure, and reduction of the electric power consumption of the small size fan are facilitated, thereby improving the commerciality as a small size fan.

Abstract: To provide a stainless steel for anti-friction bearings, which is obtained by making its eutectic carbide contents finer in particle diameter and suppressing the generation of non-metallic substances to an extremely low level, thus having a homogenious and dense structure and permitting highly accurate machining. The provided stainless steel is composed of 0.60 to 0.75% of carbon, 10.5 to 13.5% of chromium, 1.0% or below of silicon and 0.3 to 0.8% of manganese, % being by weight, the remainder of the composition being iron and inevitably introduced impurities, has a hardness of HRC 58 or above, contains eutectic carbide particles of 10 .mu.m and below in diameter, and has oxygen and titanium concentrations each of 10 ppm or below.

Abstract: In the motor, the compound bearing assembly is assembled from stepped-diameter shaft 1, sleeve-like outer race ring 5, first balls 4, second balls 8a, and inner race ring 7 a, and has a base-end portion of large-diameter portion la of the stepped-diameter shaft 1 fixedly mounted on a base member 10 of the motor at right angles to permit the stepped-diameter shaft 1 to extend upward. After that, the compound bearing assembly is fixedly mounted in a central hub portion 12 of a rotor 11 of the motor in an insertion manner to complete the motor provided with the compound bearing assembly. Consequently, it is easy for the motor manufacturer to assemble his product or motor with the compound bearing assembly at high accuracy. (See FIG.