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1. 发明专利

JPH0749094A VANE TYPE VACUUM PUMP 失效
公开(公告)号：JPH0749094A
公开(公告)日：1995-02-21
申请号：JP19449493
申请日：1993-08-05
申请人： HITACHI LTD
发明人： HORIOKA KAZUO , USAMI TOSHIKAZU , HIROYAMA HIROO , AKIYAMA TOSHIKATSU
IPC分类号： F04C25/02 , F04C18/344 , F04C28/28 , F04C29/02 , F04C29/10
摘要： PURPOSE:To provide a vacuum pump of high reliability without leakage of a lubricant by preventing leakage of the lubricant due to positional deviation of an oil seal and reverse rotation of an oil seal lip. CONSTITUTION:A second groove 5b for releasing a lubricant pressure to a discharge port is formed in addition to a first groove 5a for reducing a pressure of an oil seal portion 6 during rotation of a vacuum pump.

2. 发明专利

JPS6313967A MAGNETIC FLUID SEALING DEVICE 失效
公开(公告)号：JPS6313967A
公开(公告)日：1988-01-21
申请号：JP15784586
申请日：1986-07-07
申请人： HITACHI LTD
发明人： HIROYAMA HIROO , KAWAIKE KAZUHIKO , ARAI KATSUTOSHI , FURUKAWA YOSHIO
IPC分类号： F16J15/43 , F16J15/40
摘要： PURPOSE:To extend a life of a seal, by providing discs fixed to a shaft above and below a magnetic fluid sealing device between the shaft and a magnetic ring. CONSTITUTION:A permanent magnet 9 and magnetic rings 10 are located on the inside circumference of an upper cover 8 of a stationary casing, and they are fixed to a non-magnetic case. There are provided above and below the annular magnetic rings 10 discs 14a and 14b fixed to a shaft 1 with gaps 13a and 13b defined between the discs 14a and 14b and the magnetic rings 10. Accordingly, an oil splash which is a large particle of a lubricating oil 6 does not contact a magnetic fluid, thereby preventing a reduction in resistance pressure of a seal.

3. 发明专利

JPS6272966A MAGNETIC FLUID SEAL DEVICE 失效
公开(公告)号：JPS6272966A
公开(公告)日：1987-04-03
申请号：JP20997785
申请日：1985-09-25
申请人： HITACHI LTD
发明人： HIROYAMA HIROO , ARAI KATSUTOSHI , KAWAIKE KAZUHIKO , FURUKAWA YOSHIO
IPC分类号： F16J15/43 , F16J15/40
摘要： PURPOSE:To stabilize the sealing characteristic of a magnetic fluid seal device used in a high speed rotary machine, by feeding cooled magnetic fluid into gaps between magnetic rings and a shaft through storage chambers with the use of a cooling facility and a pump. CONSTITUTION:On the inner peripheral side of a nonmagnetic housing 2, a permanent magnet 4 is held between planer magnetic rings 3, and a shaft 1 pierces through the magnetic rings 3 at the center of the latter. Magnetic fluid 5 is applied in gaps between the magnetic rings 3 and the shaft 1. Storage chambers 6 for reserving magnetic fluid 5 are defined between the magnetic rings 3 and the nonmagnetic housing 2 on the magnetic ring 3 side at the upper and lower positions of the housing 2. Magnetic fluid which is always cooled is automatically fed into holes 11 through the storage chambers 6 by means of a cooling facility 10 and a pump 9. Therefore, an increase in temperature of magnetic fluid 5 caused by the heat of shearing friction generated by the rotation of the shaft 1 is restrained due to the heat transmission of the magnet rings 3, and substantially no lowering of sealing characteristic is caused, thereby dissipation of magnetic fluid 5 is slight.

4. 发明专利

JPS5243049A BEARING HOLDING APPARATUS 失效
公开(公告)号：JPS5243049A
公开(公告)日：1977-04-04
申请号：JP11888475
申请日：1975-10-03
申请人： HITACHI LTD
发明人： ARAI KATSUTOSHI , KANEKO RIYOUICHI , HIROYAMA HIROO , OKANO KINPEI
IPC分类号： F16C27/00 , F16C32/00 , F16C35/02
摘要： PURPOSE:Mapping out the simplification of the constitution of bearing holding apparatus in simultaneous use of control oil and cooling fluid.

5. 发明专利

JPH099560A LASER BEAM SCANNER MOTOR 失效
公开(公告)号：JPH099560A
公开(公告)日：1997-01-10
申请号：JP12984996
申请日：1996-05-24
申请人： HITACHI LTD
发明人： ARAI KATSUTOSHI , KAWAIKE KAZUHIKO , HIROYAMA HIROO , FURUKAWA YOSHIO
IPC分类号： F16C17/10 , F16C33/74 , H02K5/167 , H02K7/08 , H04N1/113
摘要： PROBLEM TO BE SOLVED: To obtain a laser beam scanner motor including a bearing having long service life and excellent in high speed and high accuracy rotation performance. SOLUTION: A rotor 20 for mounting a polygon mirror is fitted over a rotary shaft 21 supported by a magnetic fluid bearing 22 comprising a radial sliding bearing 26 and a thrust sliding bearing 27 disposed coaxially at the opposite end parts in the protruding bearing supporting part 23b of a housing 23. Stator side motor part 25 and rotor side motor part 24 are disposed on the outside of the outer circumference of bearing supporting part 23b. The housing 23 is made of a nonmagnetic material while the rotary shaft 21 is made of a magnetically permeable material and the radial sliding bearing 26 is composed of a permanent magnet ring 29 also serving as a magnetic fluid sealing means. The thrust sliding bearing 27 has the function of radial sliding bearing and made of a sintered alloy to be impregnated with the magnetic fluid.

6. 发明专利

JPH01320314A BEARING DEVICE 失效
公开(公告)号：JPH01320314A
公开(公告)日：1989-12-26
申请号：JP15233388
申请日：1988-06-22
申请人： HITACHI LTD
发明人： ARAI KATSUTOSHI , KAWAIKE KAZUHIKO , HIROYAMA HIROO , UNO TAKESHI
IPC分类号： F16C17/10 , F16C32/04 , F16C33/10 , F16C33/74 , F16C33/82 , F16J15/43
摘要： PURPOSE:To prevent magnetic fluid from deteriorating in performance, to elongate life, to improve reliability and to reduce cost by arranging a magnetic fluid seal and bearing members with spaces among them, and making bearings have a lubricating fluid circulation mechanism utilizing rotation of a shaft. CONSTITUTION:A magnetic fluid seal 2 constituted with a permanent magnet 3, a magnetic pole piece 4, a cover 5 and magnetic fluid 12 in coaxial with a bearing housing 14, and a first and a second radial bearing 6, 7, a thrust bearing 8 are arranged. Further, the magnetic fluid seal 2 is arranged on keeping a space (c) to the first radial bearing 6, and passages a-d for lubricating fluid 11 are formed with the bearing housing 14, the first and the second radial bearing 6, 7 and a rotary shaft 1. Therefore, the magnetic fluid does not overflow or disperse on account of thermal expansion, lubricating fluid is circulated by rotation of the rotary shaft 1, deterioration in performance is prevented, and elongation in life, improvement on reliability and reduction in cost can be achieved.

7. 发明专利

JPS62132028A BEARING DEVICE 失效
公开(公告)号：JPS62132028A
公开(公告)日：1987-06-15
申请号：JP26928885
申请日：1985-12-02
申请人： HITACHI LTD
发明人： HIROYAMA HIROO
IPC分类号： F16C27/00
摘要： PURPOSE:To obtain a miniaturized and stable damping device by constituting double vibration parts so as to attenuate vibration by the throttle effect due to the clearances formed between a bearing holder and a bearing case. CONSTITUTION:A bearing holder 5 is oscillatedly turned following the turning vibration of a shaft 1, and for this vibration the lubricating oil 4 in the cylindrical clearance 7 formed on both the inner and outer circumferential surfaces of the bearing holder 5 flows in the circumferential and axial directions to absorb vibration. In this case, the bearing device is double provided with clearances a, b narrow in the axial direction. Accordingly, the axial flow of the lubricating oil 4 is subject to restriction by the throttle effect of the clearances a, b, and a miniaturized and stable damping device can be obtained.

8. 发明专利

JPS61272497A TURBO MOLECULAR PUMP 失效
公开(公告)号：JPS61272497A
公开(公告)日：1986-12-02
申请号：JP11382285
申请日：1985-05-27
申请人： HITACHI LTD
发明人： ARAI KATSUTOSHI , KAWAIKE KAZUHIKO , HIROYAMA HIROO
IPC分类号： F04D19/04
摘要： PURPOSE:To make bearing supporting rigidity appropriate by supporting the rotary shaft of a rotor with more than two mechanical bearings and making the supporting rigidity of the lower bearing smaller than that of the upper bearing, and providing a vibration absorbing means on the lower bearing side. CONSTITUTION:The rotary shaft 10 of a rotor 6 is supported by an upper bearing 12 and lower bearing 16 formed in a global bearing. The lower bearing 16 supports a pivot 11 and coupled to an elastic supporting body 19 having a diaphragm 18, and soaked in lubricant 17. Comparing with supporting rigidity of the upper bearing 12, that of the lower bearing 16 is made to be set lower. Therefore, the rotor is rotatably supported by mechanical bearings and supported elastically by a bearing placed on the lower side of the rotor, and bearing supporting rigidity of the rotor can be made appropriate.

9. 发明专利

JPS6127308A Bearing device 失效
标题翻译：轴承装置
公开(公告)号：JPS6127308A
公开(公告)日：1986-02-06
申请号：JP14685484
申请日：1984-07-17
申请人： Hitachi Ltd
发明人： HIROYAMA HIROO
IPC分类号： F16C27/00
CPC分类号： F16C27/00
摘要： PURPOSE:To reduce the weight of the moving part of a bearing support part and to enable stable operation up to a high speed range, by a method wherein a viscous damper is formed on the inner periphery side of a bearing with the plane surfaces, positioned opposite to each other, of a bearing holder and a bearing case. CONSTITUTION:A shearing gap 8 is formed on the inner periphery side of a ball bearing 5 with plane surfaces, positioned opposite to each other, of a bearing holder 3 and a bearing case 6 to form a viscous damper. As noted above, a damping device is located on the inner periphery side of the ball bearing 5, and this reduces weight and size, reduces the mass of the bearing holder 3 and decreases radial load exerted on a gearing 2, stabilizes vibration characteristic of a vertical type rotary machine, and enables to perform stable rotation up to a high speed operation range. Location of the viscous damper part on the inner periphery side causes friction heat, generated by the bearing 2, to be apt to escape to the bearing case 6 through the shearing gap 8, resulting in an increase in the cooling effect of the bearing 2.
摘要翻译：目的：为了减轻轴承支撑部件的运动部件的重量，并能够在高速范围内进行稳定运转，通过在轴承的内周侧形成有粘性阻尼器的方法，彼此相对的是轴承座和轴承箱。构成：在滚珠轴承5的内周侧上形成有与轴承座3和轴承箱6相对定位的平面的剪切间隙8，形成粘性阻尼器。如上所述，阻尼装置位于滚珠轴承5的内周侧，这样减轻了重量和尺寸，减小了轴承座3的质量并减小了施加在齿轮2上的径向载荷，从而使振动特性稳定立式旋转机，能够在高速运转范围内进行稳定的旋转。内周侧的粘性阻尼器部位的位置使得由轴承2产生的摩擦热容易通过剪切间隙8逸出到轴承箱6，导致轴承2的冷却效果增加。

10. 发明专利

JPS52107455A SELF COOLING BEARING SYSTEM 失效
公开(公告)号：JPS52107455A
公开(公告)日：1977-09-09
申请号：JP2322676
申请日：1976-03-05
申请人： HITACHI LTD
发明人： KANEKO RIYOUICHI , ARAI KATSUTOSHI , HIROYAMA HIROO
IPC分类号： F16C37/00
摘要： PURPOSE:To provide a self cooling type bearing system which doesn't require a secondary device by increasing the thermal conductivity of oil film without harming vibration characteristic of a rotating element.

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