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1. 发明专利

JPH11257363A ROLLING BEARING 失效
公开(公告)号：JPH11257363A
公开(公告)日：1999-09-21
申请号：JP6330798
申请日：1998-03-13
申请人： NIPPON SEIKO KK
发明人： FUJITA YASUNOBU , YAMAMOTO MASAO , YOKOUCHI ATSUSHI , NAKA MICHIHARU
IPC分类号： G11B19/20 , C10M171/00 , C10N40/02 , C10N40/18 , F16C33/78 , H02K5/173
摘要： PROBLEM TO BE SOLVED: To provide a rolling bearing having a long life and low torque characteristics, while maintaining low dusting characteristics. SOLUTION: This bearing consists of an outer ring 2, an inner ring 3, rolling elements 5, a synthetic resin cage 7 to equally hold the rolling elements 5 and a rigid seal plate 9 provided from the neighborhood of an end part of the outer ring 2 to the neighborhood of an end part of the inner ring 3, and lubricating oil 12 is injected in a gap sectioned by the rigid seal plate 9, the outer ring 2 and the inner ring 3. In this case, an elastic member 10A which is attached to an end part of the rigid seal plate 9 and is abutted to a recessed portion 2a formed on the inner peripheral surface of the outer ring 2, and an oil repellent film 11 which is adhered to at least one of an end part 9c of the rigid seal plate 9 and a peripheral part 3a of the inner ring adjacently facing each other in a non-contact state, and contains an ingredient which is not easily wetted by the lubricating oil, are also provided.

2. 发明专利

JPH1162998A ROLLING BEARING WITH SEAL 失效
公开(公告)号：JPH1162998A
公开(公告)日：1999-03-05
申请号：JP22174197
申请日：1997-08-18
申请人： NIPPON SEIKO KK
发明人： YAMAMOTO MASAO , SAKATANI IKUNORI , YOKOUCHI ATSUSHI , NAKA MICHIHARU , FUJITA YASUNOBU
IPC分类号： F16C33/78
摘要： PROBLEM TO BE SOLVED: To provide a rolling bearing with a seal for a hard disc drive to have low dusting properties and low torque characteristics and provide an increased life. SOLUTION: A rolling bearing with a seal comprises an outer ring 1 having an outer ring track on an inner peripheral surface; an inner ring 3 having an inner ring track on an outer peripheral surface; a rolling body 5 rollable between the inner and outer ring tracks; a rigid seal sheet 9A arranged from the vicinity of the end part of the inner peripheral surface of the outer ring to the vicinity of the end part of the outer peripheral surface of the inner ring; and lubrication oil 12 with which a gap specified by a rigid seal plate, the outer ring, and the inner ring is filled. Further, the rolling bearing comprises elastic members 10 and 10A attached to at least one end part 9a of the rigid seal plate, making contact with a recess 1a formed in the inner peripheral surface of the outer ring; and an oil repellant film, attached to at least one of the other end part 9a of the rigid seal sheet, making access to and positioned facing each other in a non-contact state, and the outer peripheral surface 3a of the inner ring, and containing a component hardly wet by lubrication oil.

3. 发明专利

JPH1162972A ROLLING BEARING FOR OSCILLATION MOVEMENT 失效
公开(公告)号：JPH1162972A
公开(公告)日：1999-03-05
申请号：JP23326097
申请日：1997-08-15
申请人： NIPPON SEIKO KK
发明人： YOKOUCHI ATSUSHI , YAMAMOTO MASAO , FUJITA YASUNOBU , NAKA MICHIHARU
IPC分类号： F16C33/76 , F16C33/10
摘要： PROBLEM TO BE SOLVED: To provide a rolling bearing for oscillation movement to suppress oozing of oil though an increased life is maintained, and besides to reduce torque. SOLUTION: A ball 5 is disposed between inner and outer rings 3 and 1, a shield 9 attached to an outer ring 1 is positioned facing the seal surface 3a of the inner ring 3. Lubrication oil is contained in the internal part of a bearing consisting of the inner and outer rings 1 and 3 and the shield 9. Since an oil repellent agency is adhered to at least one of the seal surface 3a and an opposite surface 9c to the seal surface of the shield 9, oozing of lubrication oil is prevented from occurring, and the thickness of an oil film formed on a track for a race is increased.

4. 发明专利

JPH0921424A BEARING FOR ELECTRIC MOTOR 失效
公开(公告)号：JPH0921424A
公开(公告)日：1997-01-21
申请号：JP19411795
申请日：1995-07-07
申请人： NIPPON SEIKO KK
发明人： FUJITA YASUNOBU , ITO HIROYUKI , MATSUSHIMA TOSHIO , NAGAHASHI KATSUAKI
IPC分类号： F16C33/66 , H02K5/173
摘要： PROBLEM TO BE SOLVED: To provide a bearing for electric motor having the excellent durability, excellent bearing characteristic of torque and noise and the excellent fretting abrasion resistance. SOLUTION: This bearing supports a rotor shaft of an electric motor formed of a rotor shaft, on which a rotor is installed, and a stator core arranged in the periphery of the rotor 1. In each bearing 5a, 5b for electric motor, in which a rolling body 8 is interposed between an outer ring 6 and an inner ring 7, the grease containing the base oil, which contains the ester oil at 30wt.% and which has the viscosity at 80-300mm /sec at 40 deg.C, at 80-95wt.% and containing the thickener, which is made of lithium soap, at 5-20wt.% is filled at 42-60vol% of the space volume of the bearing.

5. 发明专利

JPH11210768A ROLLING BEARING FOR SUPPORTING OSCILLATING MEMBER 失效
公开(公告)号：JPH11210768A
公开(公告)日：1999-08-03
申请号：JP1244798
申请日：1998-01-26
申请人： NIPPON SEIKO KK
发明人： FUJITA YASUNOBU , YOKOUCHI ATSUSHI , YATANI KOICHI
IPC分类号： F16C33/66
摘要： PROBLEM TO BE SOLVED: To provide a lubricated rolling bearing having low torque and abrasion resistance, for supporting an oscillating member. SOLUTION: A lubricated rolling bearing with low torque and abrasion resistance, for supporting an oscillating member, can be obtained by injecting into the bearing a lubricating oil containing a fluorine surfactant material in which a part with an organo-phobic property and a part with an organo-philic property coexist in its molecular structure, and which is adsorbed and collected to the interface between the lubricating oil and the outside while keeping the parts in the molecular structure oriented in such a way that the organo-philic part is oriented to the inside of the lubricating oil while the organo-phobic part is oriented to the outside of the lubricating oil.

6. 发明专利

JPH1113769A ROLLING BEARING FOR HARD DISC DRIVE 失效
公开(公告)号：JPH1113769A
公开(公告)日：1999-01-22
申请号：JP16441097
申请日：1997-06-20
申请人： NIPPON SEIKO KK
发明人： FUJITA YASUNOBU , YATANI KOICHI , HAMAMOTO MAGOZO , TAKAGI TOSHIMI
IPC分类号： F16C33/41 , F16C33/66 , G11B21/02
摘要： PROBLEM TO BE SOLVED: To provide a rolling bearing for HDD to be excellent in fretching wear resistance without exercising an adverse influence on the characteristics of a bearing, reduce the generation of torque and the occurrence of a torque fluctuation, and provide an increased life. SOLUTION: In a rolling bearing formed such that a plurality of rolling bodies 5 are held through a holder 7 between inner and outer rings 2 and 4, a film of lubrication oil is formed on the surfaces of the inner ring 2, the outer ring 4, the holder 7, and the rolling body 5. Further, chamfering is applied on a part of the peripheral edge of an opening at least in a radial direction of the pocket of the holder 7.

7. 发明专利

JPH10318262A ROLLING BEARING 失效
公开(公告)号：JPH10318262A
公开(公告)日：1998-12-02
申请号：JP14114097
申请日：1997-05-16
申请人： NIPPON SEIKO KK
发明人： ITO HIROYUKI , FUJITA YASUNOBU
IPC分类号： F16C33/32 , F16C33/37
摘要： PROBLEM TO BE SOLVED: To prevent the occurrence of wear as much as possible even when use in an oscillating state is effected, and improve durability. SOLUTION: In a rolling bearing wherein a plurality of rolling bodies 3... are loosely fitted in a rolling state between an inner ring 2 and an outer ring 1, the rolling bodies 3... comprise load balls 10a,...10f formed of a high carbon chrome bearing steel (SUJ2) and two kinds of spacer balls (first and second spacer balls 11 and 12) formed of a material (for example, fluororesin and Nylon) having friction resistance different from the load balls 10a,...10f. The spacer balls 11 and 12 are arranged between the load ball 10a and the load ball 10f.

8. 发明专利

JPH10111230A METHOD FOR PREDICTING LIFE OF PAPER FRICTION MATERIAL 失效
公开(公告)号：JPH10111230A
公开(公告)日：1998-04-28
申请号：JP26887896
申请日：1996-10-09
申请人： NIPPON SEIKO KK
发明人： ITO HIROYUKI , FUJITA YASUNOBU , UMEZAWA SAKANORI , MIYOSHI TATSURO
IPC分类号： G01N3/32
摘要： PROBLEM TO BE SOLVED: To shorten the time required for a pressure endurance test by performing a predetermined number of times of pressure endurance before a break limit to predict the number of times of the pressure endurance on the basis of the strength ratio of the obtained tensile strength to the tensile strength of a new article. SOLUTION: A pressure endurance test is performed with a simple substance of a paper friction material as a test piece by pressure number of times (for example ten thousand times and twenty thousand times) on two points A, B before a ratio of tensile strength reaches the degradation limit value (about 50% of the case of a new article). The tensile strength of the test piece in two points A, B is measured to obtain the strength ratio (for example 82% at point A and 72% at point B) of the new article to the test piece. These two points A, B are plotted on a one sided logarithmic graph to obtain the pressure number of times (for example eighty thousand times) in an intersection point of the extension of a straight line interconnecting two points A, B and a degradation limit line L, and set this value as the pressure endurance life. Thus, the break life of the paper friction material can be predicted without performing the pressure endurance test up to the break limit to substantially shorten the test time.

9. 发明专利

JPH09112561A RETAINER FOR ROLLING BEARING 失效
公开(公告)号：JPH09112561A
公开(公告)日：1997-05-02
申请号：JP26666795
申请日：1995-10-16
申请人： NIPPON SEIKO KK
发明人： ITO HIROYUKI , FUJITA YASUNOBU
IPC分类号： F16C33/38
摘要： PROBLEM TO BE SOLVED: To make abrasion of the whole inner ring raceway and the outer ring raceway proceed uniformly and thereby improve durability by differing from each other the properties of the opposing sides in the circumferential direction of the retainer for a rolling bearing at a part of the inside circumference of respective pockets for retaining a plurality of rolling elements in a rolling free manner. SOLUTION: A retainer 6a' is provided with a pocket 7 for retaining a ball 5 in a rolling free a manner in a plurality of places in the circumferential direction of an annular main part 11. Among a pair of elastic pieces 12a, 121b arranged for composing these pockets 7, the inside circumference of one of the elastic pieces 12a is made in a spherical recessed surface 13 and the inside circumference of the other elastic piece 12b is made in a cylindrical surface 14. Thus resistance of respective balls 5 acting when the balls 5 roll in one direction and resistance of respective balls 5 acting when the balls 5 roll in the other direction are differed from each other, and even when the inner ring and the outer ring making relative rotations through respective balls 5 make a reciprocating oscillation at respective same places, the respective balls 5 and the retainer 6a' are made to make a revolving motion and abrasion of the inner ring raceway and the outer ring raceway are uniformly proceed.

10. 发明专利

JPH06228586A ELECTRO RHEOLOGICAL FLUID COMPOSITION 失效
公开(公告)号：JPH06228586A
公开(公告)日：1994-08-16
申请号：JP3620193
申请日：1993-02-02
申请人： NIPPON SEIKO KK
发明人： FUJITA YASUNOBU , YOKOUCHI ATSUSHI
IPC分类号： C10M169/04 , C10N20/06 , C10N30/02 , C10N40/14
摘要： PURPOSE:To provide an ER fluid which is not limited in the kinds of fine solid particles and dispersion medium and can retain an ER effect for a long period of time without sedimentation of the fine solid particles even in an electric field-free state. CONSTITUTION:An electrical insulating dispersion medium is blended with fine solid particles and a thixotropic agent to prepare an ER fluid. Addition of the thixotropic agent forms a network structure in the ER fluid to impart thixotropic properties to the ER fluid. The network structure is broken by application thereto of an external shear force such as vibration or agitation, but restored to the original state to prevent sedimentation of the fine solid particles when the ER fluid is allowed to let stand.

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