公开(公告)号：US20180291300A1

公开(公告)日：2018-10-11

申请号：US15948137

申请日：2018-04-09

申请人： MINEBEA MITSUMI Inc.

发明人： Motojiro TSUNA

IPC分类号： C10M115/08 ,  C10M105/06 ,  C10M105/04 ,  C10M101/02 ,  C10M105/36 ,  C10M169/02 ,  F16C33/66

摘要： A grease composition includes alkylnaphthalene as base oil and a urea compound as thickening agent. The thickening agent is an alicyclic aliphatic diurea compound contained at a ratio of 4 mass % to 10 mass % based on the total mass of the grease composition. A pivot assembly bearing device is provided with rolling bearings filled with the above grease composition. A hard disk drive device is provided with a swing arm which is swingably supported by the pivot assembly bearing device.

公开(公告)号：US20180003233A1

公开(公告)日：2018-01-04

申请号：US15637118

申请日：2017-06-29

申请人： Minebea Mitsumi Inc.

发明人： Motojiro TSUNA

IPC分类号： F16C33/66 ,  B23P15/00 ,  F16C19/54 ,  G11B5/48

CPC分类号： F16C33/6633 ,  B23P15/003 ,  C10M169/06 ,  C10M2203/1006 ,  C10M2203/1025 ,  C10M2205/0285 ,  C10M2207/2805 ,  C10M2207/2835 ,  C10M2215/1026 ,  C10M2223/041 ,  C10N2220/022 ,  C10N2230/02 ,  C10N2230/06 ,  C10N2230/70 ,  C10N2240/02 ,  C10N2250/10 ,  F16C19/54 ,  F16C2370/12 ,  G11B5/4806 ,  G11B5/4813

摘要： A ball bearing according to the present invention is filled with a grease composition. The grease composition contains a synthetic oil other than a synthetic hydrocarbon oil, a synthetic hydrocarbon oil, a mineral oil, and a urea compound. The synthetic oil other than the synthetic hydrocarbon oil is contained in an amount of 10% by mass or more and 60% by mass or less when the total of the synthetic oil other than the synthetic hydrocarbon oil, the synthetic hydrocarbon oil and the mineral oil is taken as 100% by mass.

公开(公告)号：US20220306963A1

公开(公告)日：2022-09-29

申请号：US17654303

申请日：2022-03-10

申请人： MINEBEA MITSUMI Inc.

发明人： Daiki YAMAMOTO ,  Yusuke ASAI ,  Motojiro TSUNA

IPC分类号： C10M169/00 ,  C10M107/38 ,  C10M107/02 ,  C10M119/22 ,  C10M117/04 ,  C10M123/04 ,  C10M137/04

摘要： A grease composition for resin lubrication, the grease composition to be applied to a sliding surface made of resin, the grease composition containing: a fluorine-based base oil (a kinematic viscosity at 40° C. of 300 mm2/s or higher) and a synthetic hydrocarbon oil as base oils; a fluorine-based thickener, and a lithium soap thickener or a lithium complex soap thickener as thickeners; and a fluorine-based surfactant and an extreme pressure additive as additives; and a resin sliding member (slide switch) having a sliding surface made of resin, the sliding surface provided by application with the grease composition.

公开(公告)号：US20200032157A1

公开(公告)日：2020-01-30

申请号：US16523180

申请日：2019-07-26

申请人： MINEBEA MITSUMI INC.

发明人： Yusuke ASAI ,  Daiki YAMAMOTO ,  Takuya KITAJIMA ,  Motojiro TSUNA

IPC分类号： C10M169/00 ,  C10M119/22 ,  C10M119/02 ,  C10M123/04 ,  C10M153/04 ,  C10M145/18

摘要： The invention provides a grease composition for lubrication of a sliding surface made of resin, including a fluorine-based base oil and a synthetic hydrocarbon oil as a base oil; a fluorine-based thickener, and a lithium soap thickener or a lithium complex soap thickener as a thickener; and an extreme pressure additive as an additive. The invention also provides a sliding member including a sliding surface made of a resin wherein the grease composition for lubrication is applied to the sliding surface made of a resin.