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21. 发明专利

JPH0671367A GROOVING METHOD 失效
公开(公告)号：JPH0671367A
公开(公告)日：1994-03-15
申请号：JP23111992
申请日：1992-08-31
申请人： KOYO SEIKO CO
发明人： TAKAMURA YASUO , TAKAHASHI TAKESHI
IPC分类号： B21C37/00 , B21D22/02 , B21D53/10 , B21H5/00 , B21J5/12 , F16C17/02 , F16C33/14
摘要： PURPOSE:To provide a grooving method by which a groove in a complicated shape is easily formed. CONSTITUTION:Projected parts 1a, 1a by which a prescribed pattern for grooving is structured on an outer periphery is formed; a groove forming mold 1 in which a tapered through hole 1b in the axial direction is formed is arranged in a prescribed position inside a sleeve 3; an expanding member 2 in a tapered shape is pushed in the tapered through hole 1b of the groove forming mold 1 to push to expand the groove forming mold 1 in the radius direction; the pattern which is structured by the projected parts 1a, 1a on the outer periphery of the groove forming mold 1 is pressed against the inner periphery 3a of the sleeve 3; and the groove in the prescribed pattern is formed on the inner periphery 3a of the sleeve 3.

22. 发明专利

JP2002155943A DYNAMIC PRESSURE BEARING DEVICE 失效
公开(公告)号：JP2002155943A
公开(公告)日：2002-05-31
申请号：JP2000351036
申请日：2000-11-17
申请人： KOYO SEIKO CO
发明人： ONISHI MASAYOSHI , TAKAHASHI TAKESHI , TAKAMURA YASUO
IPC分类号： F16C33/10 , F16C17/10
摘要： PROBLEM TO BE SOLVED: To provide a dynamic pressure bearing device capable of eliminating torque increase due to increase of a flange diameter of a shaft, and preventing leak of lubricating fluid to the external. SOLUTION: The shaft 3 is inserted into a through hole 2 in a housing 2 to be relatively rotatable, a flange 4 of the shaft 3 is engaged in a circular recess part 5 formed in an inner diametric surface of the through hole 2, and a dynamic pressure generating part B1 is formed between the flange 4 and the circular recess part 5 in this dynamic pressure generating bearing device. At least one inclined through passage 13 is formed from a desired position of an upper crossing angular part 11 of a flange upper surface 4a of the shaft 3 with the shaft 3 to reach a lower crossing angular part 12 of a flange lower surface 4b facing the desired position with the shaft 3.

23. 发明专利

JP2002155941A SEALED TYPE THRUST DYNAMIC PRESSURE BEARING 失效
公开(公告)号：JP2002155941A
公开(公告)日：2002-05-31
申请号：JP2000351034
申请日：2000-11-17
申请人： KOYO SEIKO CO
发明人： TAKAHASHI TAKESHI , TAKAMURA YASUO
IPC分类号： F16C33/10 , F16C17/10
摘要： PROBLEM TO BE SOLVED: To provide a thrust dynamic pressure bearing in which bubbles in lubricating oil will not affect a thrust dynamic pressure generating part. SOLUTION: In this sealed type dynamic pressure bearing, a shaft member 1 comprising a shaft body 2 and a flange 3 provided on one end of the shaft body 2, and a housing 4 to store the flange 3 of the shaft member 1 are provided to be relatively rotatable to each other, lubricating oil 5 is filled between the shaft member 1 and the housing 4, and dynamic pressure generating grooves 6 and 7 are provided in an end surface of the flange 3 or a bearing surface of the housing facing the end surface to form the thrust dynamic pressure generating part. In a circumferential surface of the flange 3, a circumferential groove 10 is formed.

24. 发明专利

JP2002155940A DYNAMIC PRESSURE BEARING DEVICE 失效
公开(公告)号：JP2002155940A
公开(公告)日：2002-05-31
申请号：JP2000351033
申请日：2000-11-17
申请人： KOYO SEIKO CO
发明人： ONISHI MASAYOSHI , TAKAHASHI TAKESHI , TAKAMURA YASUO
IPC分类号： F16C33/10 , F16C17/10
摘要： PROBLEM TO BE SOLVED: To provide a dynamic pressure bearing device eliminating torque increase due to enlargement of a flange diameter of a shaft and preventing leakage of lubricating fluid to the outside. SOLUTION: In this dynamic pressure bearing device provided with a relatively rotating housing 1 and the shaft 3 rotating inside a through-hole 2 of the housing 1, the lubricating fluid 6 is sealed between the housing 1 and the shaft 3, a flange 4 of the shaft 3 is fit in an annular recessed part 5 of an inner diameter face of the housing 1, and thrust dynamic pressure generating parts B1 and B2 are provided between the annular recessed part and upper and lower faces of the flange 4. It is characterized by that a communication passage 11 opened to a bottom part 5c of the annular recessed part 5 from the through- hole 2 of the housing 1 is formed in a housing 1 portion on a flange upper face 4a side of the shaft 3.

25. 发明专利

JP2000291647A DYNAMIC BEARING 失效
公开(公告)号：JP2000291647A
公开(公告)日：2000-10-20
申请号：JP10386699
申请日：1999-04-12
申请人： KOYO SEIKO CO
发明人： FUJII YOSHIKI , HIRAOKA TAIJI , TAKAMURA YASUO
IPC分类号： F16C17/04
摘要： PROBLEM TO BE SOLVED: To prevent swing and improve rotation precision by chamfering an outer peripheral fringe of a flange part of a dynamic bearing in which the flange part is eccentric for a shaft part so that an end face of the flange part becomes concentric with the shaft part. SOLUTION: Lubricant for generating dynamic pressure is filled between a housing 1 and a shaft 2, and the shaft 2 is constituted by a shaft part 5 and a flange part 6 which is eccentric for it. Moreover, a dynamic pressure generation groove for radial direction support is formed on an outer peripheral face of the shaft part 5, a dynamic pressure generation groove for axial direction support is formed on end faces 6a, 6b of the flange part 6, and a chamfered part C is formed at an outer peripheral fringe of the flange part 6 so that the end faces 6a, 6b become concentric with the shaft part 5. Consequently, radii in each part in the peripheral direction of the end faces 6a, 6b become the same, and support forces due to dynamic pressure at any place in the peripheral direction of the end faces 6a, 6b become equal. As a result, the center of rotation of the housing 1 does not swing for a shaft core of the shaft 2, and rotation precision is improved.

26. 发明专利

JPH09273543A DYNAMIC PRESSURE BEARING 失效
公开(公告)号：JPH09273543A
公开(公告)日：1997-10-21
申请号：JP8514096
申请日：1996-04-08
申请人： KOYO SEIKO CO
发明人： ONISHI MASAYOSHI , KOBAYASHI YASUHIRO , TAKAMURA YASUO , TAKAHASHI TAKESHI
IPC分类号： F16C17/04 , F16C33/10
摘要： PROBLEM TO BE SOLVED: To provide a dynamic pressure bearing which can prevent leakage of lubricating fluid from a through-hole of a sleeve. SOLUTION: A dynamic pressure bearing has an axial supporting part 9 composed of a dynamic pressure groove 6 in an axial direction of a flange 1 and a bearing surface 7 of sleeve 5 opposed to the dynamic pressure groove 6, a circular fine passage 12 composed of a peripheral surface 10A of a shaft 2 adjacent to one side of a flange 1 and an inner peripheral surface 11 of a sleeve 5 opposed to the peripheral surface 10A, and a lubricant reservoir 14 composed of a truncated conical inner peripheral surface 13 adjacent to the circular fine passage 12, recessed in a diametrally outward direction, and tapered to one end in an axial direction. The circular fine passage 12 prevents leakage of lubricant 8 from the axial support part 9. The lubricant which reaches the lubricant reservoir 14 receives centrifugal force due to rotation of the sleeve 5, and moved toward the axial support part along the truncated conical inner peripheral surface 13 of the sleeve 5.

27. 发明专利

JPH09229053A DYNAMIC PRESSURE BEARING 失效
公开(公告)号：JPH09229053A
公开(公告)日：1997-09-02
申请号：JP3359896
申请日：1996-02-21
申请人： KOYO SEIKO CO
发明人： TAKAHASHI TAKESHI , TAKAMURA YASUO
IPC分类号： F16C17/04
摘要： PROBLEM TO BE SOLVED: To strengthen against moment applied from the outside, and sufficiently exhibit axial supporting force at starting. SOLUTION: This dynamic pressure bearing is formed with pump-out type dynamic pressure generating grooves 5, 6 on the end faces 2A, 2B of flanges 2 of a shaft part 1. The flanges 2 are provided with through holes 7 penetrating in the axial direction in the vicinity of inner ends in the radial direction of the grooves 5, 6. At rotating the shaft part 1, the dynamic pressure generating grooves 5, 6 generate the peak of dynamic pressure in the vicinity of the outer ends in the radial direction of the grooves 5, 6. At starting, the dynamic pressure generating grooves 5, 6 push out fluid to the outside in the radial direction of the flanges 2, and hence fluid on the circumference of the flange can be prevented from being drawn in toward the shaft.

28. 发明专利

JPH0979250A DYNAMIC PRESSURE BEARING DEVICE 失效
公开(公告)号：JPH0979250A
公开(公告)日：1997-03-25
申请号：JP26088495
申请日：1995-09-12
申请人： KOYO SEIKO CO
发明人： TAKAMURA YASUO , TAKAHASHI TAKESHI
IPC分类号： F16C17/04 , H02K5/167
摘要： PROBLEM TO BE SOLVED: To provide a dynamic pressure bearing device in which is a shaft separated from a thrust plate to be worked which is improved in working and assembling accuracy, accordingly, and which can hold dynamic pressure balance improved in a radial/thrust direction at rotary motion time. SOLUTION: In a dynamic pressure bearing device respectively fixedly providing a shaft 3 in the center part of a rotary member 1 and a sleeve 8 in the center part of a fixed member 2, fitting these shaft, and forming a dynamic pressure bearing, a thrust plate 7 is fixedly provided in the shaft 3 with a protrusive part 1b provided in the rotary member, by a screw 5. The thrust plate 7 is arranged in a circumferential recessed part space 10 formed in an internal circumferential surface of the sleeve 8, and respectively a thrust dynamic pressure bearing is formed between the thrust plate 7 and the circumferential recessed part space 10. The thrust plate 7 may be fixed to the shaft 3 through an O ring.

29. 发明专利

JPH0925929A DYNAMIC BEARING 失效
公开(公告)号：JPH0925929A
公开(公告)日：1997-01-28
申请号：JP20050395
申请日：1995-07-13
申请人： KOYO SEIKO CO
发明人： TAKAHASHI TAKESHI , TAKAMURA YASUO
IPC分类号： F16C17/10
摘要： PROBLEM TO BE SOLVED: To supply fluid to both dynamic bearings regardless of the volumetric size of a fluid sump part for supplying the fluid to the dynamic bearings by forming a step part with its diameter lager than the shaft diameter on the shaft main body of the shaft part in the fluid sump part and dividing the fluid sump part into a radial dynamic bearing side and an axial dynamic bearing side by means of this step part. SOLUTION: A step part 12 with its diameter larger than the shaft diameter of a shaft main body 2 is formed on the angle part between the shaft main body 2 and a flange 3 so that it may project in its non-contact state toward the slant peripheral surface of the sleeve 4 and an oil sump part 11 is substantially divided into an oil sump part 9 on a radial dynamic bearing side and an oil sump part 10 on an axial dynamic bearing side by means of this step 12. Also, as the tip of the step part 12 is so constructed as approaching to the slant peripheral surface 14 of the sleeve 4, the oil sump part 11 can be easily divided, with the tip position of the step part 12 located in any position of the width of the slant peripheral 14. Therefore, fluid supply to both dynamic bearings can be achieved certainly without any trouble such as no fluid supply to one side dynamic bearing.

30. 发明专利

JPH08219147A DYNAMIC PRESSURE BEARING AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH08219147A
公开(公告)日：1996-08-27
申请号：JP2262295
申请日：1995-02-10
申请人： KOYO SEIKO CO
发明人： TAKAHASHI TAKESHI , TAKAMURA YASUO
IPC分类号： F16C17/04 , F16C33/10 , F16C33/14
摘要： PURPOSE: To enlarge a load capacity, and prevent an opposing surface from being injured by a groove projection part. CONSTITUTION: The groove 6 for generating dynamic pressure is formed on a thrust bearing surface 2 by plastic working. In a projection part 7 which is held between the grooves 6 and 6, the edge part 7B-1 of a projection end part 7B is bent, and a flat bearing surface 7A which is enclosed with the edge part 7B-1 of the projection end part 7B is provided. It is possible to prevent an opposing surface from being injured since the edge part 7B-1 is bent. And it is possible to increase a load capacity since the bearing surface 7A is provided.

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