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公开(公告)号：US20190096443A1
公开(公告)日：2019-03-28
申请号：US16125802
申请日：2018-09-10
Applicant: Nidec Corporation
Inventor： Hiroki YAMADA
Abstract: Provided is a base unit for use in a disk drive apparatus and to be attached to a cover portion to define an enclosed space to be filled with a gas having a density lower than that of air. The base unit includes a base portion arranged to extend radially and support a motor capable of rotating about a central axis extending in a vertical direction; and a lateral wall portion arranged to extend axially upward from an edge portion of the base portion. The base portion includes a part accommodating portion defined by a through hole arranged to pass through the base portion in an axial direction, and arranged to accommodate at least a portion of a predetermined part; and a seal member arranged to close an end portion of the through hole on one axial side. The base portion and the lateral wall portion include a base made of a metal; a coating portion formed by electrocoating a surface of the base with at least a resin; and at least one exposed portion where the surface of the base is exposed. The at least one exposed portion is arranged in at least one of a predetermined first region and a second region. The first region lies on an axially upper end portion of the lateral wall portion, the axially upper end portion being opposite to the cover portion. The second region lies on an outer surface of the base portion, and is arranged to extend outward from an edge of the part accommodating portion so as to have a predetermined width.
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公开(公告)号：US20190097485A1
公开(公告)日：2019-03-28
申请号：US16102816
申请日：2018-08-14
Applicant: Nidec Corporation
Inventor： Hiroki YAMADA
Abstract: A motor includes a support portion arranged to hold a stator and a bearing. The support portion includes a bearing holding portion arranged to extend upward along a central axis, and arranged to hold the bearing with a radially inner surface thereof; and a stator holding portion being tubular, arranged to project upward from an upper surface of the bearing holding portion, and arranged to hold a radially inner surface of the stator with a radially outer surface thereof. An axially lower portion of the stator holding portion includes a decreased thickness portion where the radial thickness of the stator holding portion is smaller than at another portion of the stator holding portion at another axial position.
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3.发明申请公开(公告)号：US20130243356A1
公开(公告)日：2013-09-19
申请号：US13893535
申请日：2013-05-14
Applicant: Seagate Technology LLC , Nidec Corporation
Inventor： Hiroki YAMADA , Junya MIZUKAMI , Tsuyoshi MORITA , Tetsuya MARUYAMA , Takuro IGUCHI , Troy Michael HERNDON , Timothy Edward Langlais
IPC: F16C32/06
CPC classification number: F16C32/0659 , F16C17/107 , F16C33/107 , F16C33/1085 , F16C33/745 , F16C2370/12 , G11B19/2036
Abstract: A fluid dynamic bearing apparatus includes a first minute gap, a second minute gap, a third minute gap, a fourth minute gap, and a fifth minute gap. A flow of a lubricating oil from the fifth minute gap to the fourth minute gap is caused by a plurality of dynamic pressure generating grooves arranged within the fluid dynamic bearing apparatus. This flow causes air bubbles mixed in the lubricating oil within the fifth minute gap to flow toward the third minute gap and be discharged to an outside through the third minute gap. The fluid dynamic bearing apparatus further includes a plurality of dynamic pressure generating grooves and an all around groove.
Abstract translation: 流体动力轴承装置包括第一微小间隙，第二微小间隙，第三微小间隙，第四微小间隙和第五微小间隙。 润滑油从第五分钟间隙到第四微小间隙的流动由布置在流体动力轴承装置内的多个动压产生槽引起。 该流动使第五分钟间隙内的润滑油中混合的气泡朝向第三微小间隙流动，并通过第三微小间隙排出到外部。 流体动力轴承装置还包括多个动压产生槽和全周围槽。
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公开(公告)号：US20190097488A1
公开(公告)日：2019-03-28
申请号：US16102817
申请日：2018-08-14
Applicant: Nidec Corporation
Inventor： Hiroki YAMADA , Atsushi WATASHITA , Keisuke KAWATA
Abstract: A motor includes a shaft, a bearing that rotatably supports the shaft, and a hub fixed to the shaft. The shaft includes a first shaft portion extending in an axial direction, a second shaft portion projecting axially upward from an axially upper end surface of the first shaft portion and including a diameter smaller than that of the first shaft portion, and a screw hole recessed axially downward from the axially upper end surface. The hub includes a shaft fixing hole into and in which the second shaft portion is inserted and fixed. An outer surface of the second shaft portion includes a first region, and a second region axially above the first region, and including surface roughness smaller than that of the first region.
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