Abstract: The invention provides a weather-resistant exterior building material which has been unavailable in the past with respect to characteristics of keeping harmful insects such as white ants, and so forth away therefrom, light weight, a long service life, insusceptibility to variation in temperature, hygroscopicity, and easiness in fabrication, and an exterior article made up of the same. The weather-resistant exterior building material according to the invention makes use of a compact formed of RB ceramic, CRB ceramic, or fire-resistant CRB ceramic.

Abstract: A ceramic material suitable for use in production of paving tiles, construction tiles, flooring in offices, flooring in machinery plants and so forth is obtained by a method comprising steps of mixing defatted bran derived from rice bran with a thermosetting resin before kneading, subjecting a kneaded mixture thus obtained to a primary firing in an inert gas at a temperature in a range of 700 to 1000° C., pulverizing the kneaded mixture after the primary firing into carbonized powders, kneading the carbonized powders with which ceramic powders, a solvent, and a binder as desired are mixed into a plastic workpiece (kneaded mass), pressure-forming the plastic workpiece at pressure in a range of 10 to 100 MPa, and subjecting a formed plastic workpiece thus obtained again to firing in an inert gas atmosphere at a temperature in a range of 100 to 1400° C.

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 land formed on the inner peripheral surface of the outer ring of a bearing is pressed under predetermined pressure against the outer peripheral surface of a rotating finishing roller. Burrs and/or fine foreign materials formed on the land are unremovably embedded in the land by pressing projections formed on the land. When a relative movement between the outer ring and the land is performed, the land is more smoothened and the burrs and/or the fine foreign materials are fully and further unremovably embedded in the land. When a spiral groove is formed on the outer peripheral surface of the finishing roller, the amount of the burrs and/or fine foreign materials embedded in the land is reduced.

Abstract: A motor of long life and high precision in its rotation wherein the variation on the rotation and the noises generated thereby are suppressed by maintaining the radial clearance between the components of the bearing device constantly in an appropriate value even if the thermal expansion of the components is caused by rising the temperature thereof.

Abstract: A motor of long life and high precision in its rotation wherein the variation on the rotation and the noises generated thereby are suppressed by maintaining the radial clearance between the components of the bearing device even if the thermal expansion of the components is caused by rising the temperature thereof.

Abstract: A motor of high precision in its rotation wherein the variation of the resonant frequency or the rotational run out due to thermal expansion of the component of the bearing device through the increasing temperature thereof is difficult to occur.

Abstract: A finishing ball (10) having a larger outer diameter (D2) than the inner diameter (D1) of a cylindrical bore (6a) defined by the land (6) of a bearing (1) and a higher hardness than that of the land (6) is allowed to be pushed into and pass through the land (6). Parts of burrs (C) produced on the land (6) by cutting operation or grinding operation and fine foreign materials attached to the land (6) are detachably embedded in the land and the remainder of the burrs (C) and the remainder of the fine foreign materials (D) are fully removed away from the land (6).

Abstract: There is provided a maintenance-free sleeve bearing arrangement that is light in weight, has a long service life and does not require resupply of oil during operation. The sleeve bearing arrangement is comprised mainly of a shaft and a sleeve bearing, wherein the sleeve bearing formed of CRB ceramics, and/or the shaft formed of the CRB ceramics are used.

Abstract: The invention provides a special type bearing device that is insusceptible to damage, is light in weight, has a long service life, and excellent wear resistance, is insusceptible to the effect of change in temperature, is easy to fabricate, and has little offensiveness towards mating members. Further, the same is capable of sufficiently retaining a lubricant such as oil and grease, and retaining the lubricant for a long period of time without the need of supplying oil during operation, thereby rendering it maintenance-free. That is, the special type bearing device as described above comprises an axis, a pair of rotating bodies fixedly attached to the axis, and a supporting body with which the rotating bodies are in contact, wherein any one of the axis, the rotating bodies, and the supporting body is made of RB ceramic or CRB ceramic.

Abstract: There is provided a porous material suitable for use in a bearing rolling element, having such properties as a small contraction ratio of the dimensions of a formed workpiece formed thereof to those of a finished product, excellent hot oil resistance, small contraction change, insusceptibility to damage, light weight, a long service life, and ability to retain oil and grease for a long period of time.

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, alminosilicate 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 bearing structure for a flat motor, having a rotor provided with a permanent magnet which is rotatively supported by the bearing structure mounted on a casing and by a stator structure mounted on the casing, in which the rotating magnetic field generated by the stator structure in opposition to the permanent magnet causes the rotor to rotate, and wherein either the outer race or the inner race of a compound bearing structure having a single row ball bearing and a cylindrical bearing, is fixed to the bearing structure mounted on the casing, while the other face is fixed to the rotor.

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 spindle motor having a pivot which tip portion can easily be formed by a spherical surface having high precision, high hardness, the diameter of which can be determined as desired, the tip portion 6a of the pivot 6 is formed by cutting a steel ball used in a bearing or the like having any diameter. The pivot 6 having a spherical surface 6a is formed by fixing the pivot tip portion 6a to one side surface 6c of a substantially cylindrical shaft portion 6b. As a result, the spherical surface having a high precision, high hardness which diameter can be determined as desired can easily be formed at the tip portion 6a of the pivot 6.

Abstract: There is provided a porous material suitable for use in a bearing retainer, having such properties as a small contraction ratio of the dimensions of a formed workpiece to those of a finished product, excellent hot oil resistance, small contraction change, insusceptibility to damage, light weight, a long service life, and ability to retain oil and grease for a long period of time. The porous material suitable for use in the bearing retainer is obtained by a process comprising the steps of mixing degreased bran derived from rice bran with a thermosetting resin before kneading, subjecting a kneaded mixture to a primary firing in an inert gas at a temperature in a range of 700 to 1000° C.

Abstract: The object of the present invention is to provide a compound bearing apparatus having arrangements for preventing the lubricant present around the rotating bodies from leaking out to the outside as well as the interior space between two rows of rotating bodies of the bearing apparatus. This is effected for the purpose of providing the compound bearing apparatus and a spindle motor and a swing arm assembly for a hard disk drive device including such bearing apparatus in which the sufficient amount of lubricant can be retained around the rotating bodies to obtain long life feature and having substantially no noise or vibration due to the loss of lubricant.

Abstract: A blower includes a durable and quiet bearing structure which eliminates or reduces rotational run out, and a bearing wherein the number of essential components and cost for manufacturing is reduced, and the diameter of the shaft can be increased. The blower has an impeller adapted to be rotated upon energizing the blower. The blower has a bearing apparatus which supports the rotational center portion of the impeller, in which the bearing apparatus has a sleeve, and a stepped shaft including a larger diameter portion and a reduced diameter portion provided at one end thereof. A first rolling contact groove is formed at an appropriate position on the outer peripheral surface of the larger diameter portion. A second rolling contact groove is formed on an inner peripheral surface of the sleeve so as to correspond with the first rolling contact groove.

Abstract: A motor and a method of manufacturing the motor are provided for preventing undesirable deformation of the sleeve hole caused by a press fitting force during press fitting process, thus facilitating the assembly process and improving the productivity. A recess is formed on an inner peripheral wall of a center cylindrical portion at the center of a flange body. When press fitting a sleeve body into a hole (sleeve fitting hole) of a flange assembly unit for integrating both members, the annular recess of the flange assembly unit serves to reduce the contact area between the sleeve body and the flange body. The press fitting force exerted to the contact area is reduced. Therefore the deformation of the inner diameter of the sleeve body that has been press fitted is minimized, thus suppressing deformation of the inner diameter portion of the sleeve body and the flange body.

Abstract: A spindle motor comprising a double row bearing device including a shaft, a sleeve surrounding the shaft, and a pair of upper and lower rows of balls, a cylindrical bearing holder extending upwardly from a base of the spindle motor for accommodating the sleeve within a vertical bore of the holder, and a rotor hub mounted on the shaft for journaling the rotor hub rotatably on the base, the spindle motor is characterized in that a reduced inner diameter portion of an inner diameter smaller than the outer diameter of the sleeve is formed on the inner surface of the bore of the bearing holder between the upper and lower larger inner diameter portions to urge the sleeve inwardly by the reduced inner diameter portion to deform it elastically to form a squeezed portion protruding inwardly of the sleeve between the upper and lower rows of balls.