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91. 发明专利

JPH09210060A MAGNETIC FLUID BEARING UNIT AND MOTOR PROVIDED WITH THE UNIT 失效
公开(公告)号：JPH09210060A
公开(公告)日：1997-08-12
申请号：JP1376696
申请日：1996-01-30
申请人： HITACHI LTD , HITACHI CHEMICAL CO LTD
发明人： TOKUSHIMA HIDEKAZU , MIYASAKA MOTOHIRO , AIZAWA MICHIHIRO , YOMO HIDEO , ARAI KATSUTOSHI
IPC分类号： F16C17/10 , F16C32/04 , F16C33/10 , H02K5/16 , H02K5/167
摘要： PROBLEM TO BE SOLVED: To provide a bearing unit for small motor which does not cause leakage and sputtering of magnetic fluid from the bearing unit in a wide rotation region from low speed to high speed and provides high rotation precision. SOLUTION: It is a bearing unit which supports a rotation body by a radial sliding bearing mounted in a bearing housing which uses magnetic fluid as lubricant in such a manner that it can rotate freely. Radial porous oil impregnating bearings 3a, 3b in which magnetic fluid 6 is impregnated are arranged in a non-magnetic bearing housing 2, and the oil impregnating bearings 3a, 3b are nipped by ringlike permanent magnets 4, 5a, 5b of which magnetic pole is set in one direction so that the magnetic fluid 6 is held in the radial porous oil impregnating bearings.

92. 发明专利

JPH0919100A MOTOR TIGHTLY SEALED TO REDUCED PRESSURE STATE AND ITS MANUFACTURE 失效
公开(公告)号：JPH0919100A
公开(公告)日：1997-01-17
申请号：JP16176695
申请日：1995-06-28
申请人： HITACHI LTD
发明人： ARAI KATSUTOSHI
IPC分类号： G02B26/12 , F16J15/43 , G02B26/10 , H02K5/10 , H02K5/16 , H02K7/08 , H02K21/24
摘要： PURPOSE: To provide a polygon mirror motor tightly sealed to a state of reduced pressure with an extremely small windage loss which has a high rotating accuracy even at a high speed. CONSTITUTION: A magnetic fluid bearing, which utilizes magnetic fluid 9 for lubricating and sealing bearing 7 and 8, is used; a flange 5 is provided at an open end of a housing 5 having a bottom, and a cover capable of maintaining airtightness is arranged in the flange portion; and a polygon mirror motor 1 as a target is tightly sealed to a reduced pressure state within a pressure- reduced chamber without providing any special air vent.

93. 发明专利

JPH08326755A BEARING UNIT 失效
公开(公告)号：JPH08326755A
公开(公告)日：1996-12-10
申请号：JP13811895
申请日：1995-06-05
申请人： HITACHI LTD , HITACHI CHEMICAL CO LTD
发明人： TOKUSHIMA HIDEKAZU , MIYASAKA MOTOHIRO , AIZAWA MICHIHIRO , YOMO HIDEO , ARAI KATSUTOSHI
IPC分类号： F16C33/10
摘要： PURPOSE: To provide a stable bearing unit without oil leakage. CONSTITUTION: A bearing unit bears a rotary shaft 2 rotatably by setting two porous oil retaining slide bearings 4a and 4b impregnated with oil apart from the bearing space 1c between nonmagnetic bearing housings 1a and 1b, and interposing magnetic fluid 5 between the rotary shaft 2 and the porous oil retaining slide bearings 4a and 4b. The retention of the magnetic fluid 5 and circulative oiling are performed between the two porous oil retaining slide bearings 4a and 4b.

94. 发明专利

JP2511915B2 失效
公开(公告)号：JP2511915B2
公开(公告)日：1996-07-03
申请号：JP30643686
申请日：1986-12-24
申请人： HITACHI LTD
发明人： NEMOTO TOMIO , ARAI KATSUTOSHI , AIZAWA KOJI , SEKIDO KENJI
IPC分类号： F16J15/34

95. 发明专利

JPH08109923A MAGNETIC FLUID FEEDING POROUS OIL RETAINING BEARING UNIT 失效
公开(公告)号：JPH08109923A
公开(公告)日：1996-04-30
申请号：JP24749594
申请日：1994-10-13
申请人： HITACHI LTD , HITACHI CHEMICAL CO LTD
发明人： TOKUSHIMA HIDEKAZU , MIYASAKA MOTOHIRO , AIZAWA MICHIHIRO , YOMO HIDEO , ARAI KATSUTOSHI
IPC分类号： F16C17/02 , F16C32/04 , F16C33/10 , F16C33/74
摘要： PURPOSE: To ensure the sealing of the magnetic fluid by arranging a ring-shaped permanent magnet fixed to a magnetically permeable rotary shaft on an opening end side of a housing, placing a porous oil retaining bearing impregnated with the magnetic fluid adjacent thereto keeping a clearance therebetween, and providing a spiral groove for generating the dynamic pressure in the inner circumferential surface of the housing or in the outer circumferential surface of the permanent magnet. CONSTITUTION: The magnetic fluid 4 is kept within a bearing unit 1 by the magnetic attraction of a permanent magnet 6 when a rotary shaft is stopped or driven at a low speed with small dynamic pressure effect to a spiral groove 5. When the rotary shall is driven at a high speed, the impregnated magnetic fluid 4 is inflated by the self heat generation of a porous oil retaining bearing 7 and oozed from the bearing 7, and attracted to the permanent magnet 6. The spiral groove 5 of a housing 3 is provided so as to push back the magnetic fluid 4 by the rotation of a rotary shaft 2, and the magnetic fluid 4 of the spiral groove 5 lubricates the end face of the bearing 7. The magnetic fluid 4 corresponding to the oozed amount is attracted to the bearing 7 by the capillary effect, and this is repeated. The magnetic fluid 4 does not overflow from the housing 3 to realize the sure sealing.

96. 发明专利

JPH084752A BEARING DEVICE, MOTOR AND POLYGON MIRROR MOTOR HAVING THIS DEVICE 失效
公开(公告)号：JPH084752A
公开(公告)日：1996-01-09
申请号：JP13688294
申请日：1994-06-20
申请人： HITACHI LTD
发明人： ARAI KATSUTOSHI , MATSUBAYASHI JUN , NAKAJIMA TAKESHI , SONE NOBUKATSU
IPC分类号： G02B26/12 , F16C17/02 , F16C33/10 , G02B26/10
摘要： PURPOSE:To obtain highly accurate rotation by forming a stable oil film between a slidingly movable clearance in a bearing device used in a motor to be rotated at high speed like a polygon mirror motor. CONSTITUTION:In a bearing device provided with a rotary shaft 8, a porous sintered oil impregnated radial bearing 18 to rotatably support the rotary shaft 8, a bearing support part 4 to support the radial bearing 18 and lubricating oil to lubricate a slidingly movable clearance between the rotary shaft 8 and the radial bearing 18, the bearing device is characterized in that dynamic pressure in the slidingly movable clearance is kept under positive pressure.

97. 发明专利

JPH06307452A ROTOR BEARING DEVICE, MOTOR AND POLYGON MIRROR MOTOR 失效
公开(公告)号：JPH06307452A
公开(公告)日：1994-11-01
申请号：JP10070993
申请日：1993-04-27
申请人： HITACHI LTD
发明人： ARAI KATSUTOSHI , HASHIMOTO ICHIRO , NAKAJIMA TAKESHI , AKASHI SUEO
IPC分类号： F16C17/02 , F16C33/10 , F16C33/74 , F16J15/43 , H02K5/16 , F16J15/40
摘要： PURPOSE:To reduce rotation fluctuation of a rotator by having lubricating oil for lubricating sliding clearance provided between the rotary shaft and a radial bearing and suppressing generation of bubbles generated in lubricating oil by rotation of a rotary shaft. CONSTITUTION:Lubricating oil in a clearance provided between the inner circumference of a fluid communicating hole 22 for a bearing and the outer circumference of a rotary shaft is turned in association with rotation of the rotary shaft so as to be generated the cavity of bubbles and air in lubricating oil in the clearance of the fluid communicating hole 22 for the bearing. Generation phenomenon of bubbles and air cavity is notably appeared when the clearance of the fluid communicating hole 22 for the bearing is enlarged and rotating speed is high. When the rotary shaft is inserted in inner and outer radial bearings 18, 19 at the time of assembly of a motor, fine air in lubricating oil or air particles including in lubricating oil beforehand grow into the bubbles and air cavity. A clearance size a is set to 1/20 or less of the diameter of the rotary shaft. It is thus possible to suppress generation of bubbles or air cavity so as to suppress rotation fluctuation of the rotator.

98. 发明专利

JPH0580270A POLYGON MIRROR OR POLYGON MIRROR MOTOR 失效
公开(公告)号：JPH0580270A
公开(公告)日：1993-04-02
申请号：JP23927891
申请日：1991-09-19
申请人： HITACHI LTD
发明人： UNO TAKESHI , AKASHI SUEO , ARAI KATSUTOSHI
IPC分类号： B41J2/44 , G02B26/10 , G02B26/12
摘要： PURPOSE:To provide the polygon mirror or polygon mirror motor which has a small rotational irregularity by applying a setting adhesive to the surface of the polygon mirror at a different-diameter place and rotating the polygon mirror at a high speed by a motor which has magnetic flux bearings. CONSTITUTION:Large unbalance of the polygon mirror 36 is corrected by dripping the adhesive (weight) on the outer peripheral part of the polygon mirror 36 and small unbalance which can not be removed by the method is corrected by dripping the adhesive inside the outer peripheral part. Consequently, the unbalance can stably and efficiently be corrected without applying any external force to the mirror 36 nor producing any dust after the fitting of the mirror 36. Further, this corrected polygon mirror 36 is driven by the motor which has the magnetic fluid bearing units 23-30 to provide the long-life polygon mirror which has the small rotational irregularity.

99. 发明专利

JPH0565921A CERAMIC BEARING 失效
公开(公告)号：JPH0565921A
公开(公告)日：1993-03-19
申请号：JP22690791
申请日：1991-09-06
申请人： HITACHI LTD
发明人： AIZAWA KOJI , ARAI KATSUTOSHI , OKADA RYOJI , YAMADA MASAYUKI
IPC分类号： F16C33/24
摘要： PURPOSE:To simplify structure with the minimum machining to a bearing and improve reliability by forming the bearing of impulse ceramics, a metal case for enclosing the impulse ceramics, keep plates and a filler. CONSTITUTION:A metal case 2 divided into two is provided with four-piece segmental ceramics 1 and keep plates B1 disposed alternately. A filler C is put into a clearance between the inner peripheral side of the metal case 2 and the outer peripheral side of the ceramics 1, and clearance parts between the keep plates B1 and ceramics 1 to fix them adhesively. The filler C is put also into both end face clearances between the keep plates 1 and ceramics 1 to fix also the vertical direction adhesively. The ceramics 1 is thus fixed adhesively to the metal case 2 divided into two. Accordingly, even with the action of impact load, this impact load can be received uniformly by the layer of the filler C without the generation of stress concentration, so that the damage of the ceramics 1 is prevented to obtain a bearing of high reliability.

100. 发明专利

JPH046667A ROTARY EQUIPMENT AND MOTOR OR ITS BEARING COMPONENT 失效
公开(公告)号：JPH046667A
公开(公告)日：1992-01-10
申请号：JP10761790
申请日：1990-04-25
申请人： HITACHI LTD
发明人： ARAI KATSUTOSHI , NAKANO MASAAKI , TAKAHASHI TAKESHI , UNO TAKESHI
IPC分类号： G11B19/20 , F16C17/02 , F16C32/00 , H02K29/00
摘要： PURPOSE:To enhance support stiffness of a rotating body, to attain positioning with high precision, to ensure fluid lubrication and to prevent scattering of magnetic fluid by arranging permanent magnets on a shaft, magnetizing the magnetic fluid on a radial bearing slide face to support the fluid on the shaft securely and forming a thrust bearing with the permanent magnets arranged opposite to each other. CONSTITUTION:Since permanent magnets 4a, 4b are arranged in a hollow of a shaft 1 opposite to a slide face of radial bearing 2a, 2b, magnetic fluid 3a(3b) of the sliding face of the bearings 2a, 2b is magnetized and supported on the surface of the shaft strongly. Thus, sure fluid lubrication is ensured and the fluid is not scattered by rotation of the shaft. Moreover, thrust bearing components 5a, 5b, 15a, 15b utilize the magnetic force of the permanent magnets to balance the magnetic forces of two sets of permanent magnets 5a, 5b, 15a, 15b to support the shaft 1 in noncontact state. Thus, the gap between opposed faces of the magnets is made narrow to increase the magnetic force thereby position the shaft 1 in the axial direction with high precision. Thus, flowout or scattering of the magnetic fluid is not caused and the smooth and highly precise rotation is maintained.

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