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公开(公告)号：US11959519B2
公开(公告)日：2024-04-16
申请号：US17434793
申请日：2020-02-28
申请人： NTN Corporation
摘要： A preload inspection method for a bearing device for a vehicle wheel comprises: a first bearing preload value calculation step for calculating a first bearing preload value; a first rotating torque measurement step for measuring a first rotating torque; a caulking step for swaging the small-diameter stepped part to the inner ring; a second bearing preload value calculation step for calculating a second bearing preload value; a second rotational torque measurement step for measuring a second rotational torque; a third bearing preload value calculation step for calculating a third bearing preload value by adding, to the first bearing preload value, a preload change amount based on a differential torque between the first rotating torque and the second rotating torque; and a determination step for determining the suitability of the preload from the second bearing preload value and the third bearing preload value.
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公开(公告)号：US11939955B2
公开(公告)日：2024-03-26
申请号：US17599518
申请日：2020-03-06
申请人： NTN CORPORATION
发明人： Hitoshi Saito , Takashi Haseba
CPC分类号： F03D17/00 , F03D7/0264 , F03D80/70 , F05B2240/50 , F05B2260/4031 , F05B2260/80 , F05B2270/327 , F05B2270/807 , Y02E10/72
摘要： A condition monitoring system includes a monitoring terminal, an acceleration sensor, and a data processor. The data processor calculates a diagnostic parameter from data measured by the acceleration sensor, determines a degree of damage to a bearing or a gear included in a wind turbine generator based on the diagnostic parameter, and controls the monitoring terminal to show information indicating a degree of suppression of electric power generated by the wind turbine generator in accordance with the degree of damage to the bearing or the gear.
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公开(公告)号：US20240084853A1
公开(公告)日：2024-03-14
申请号：US17767891
申请日：2020-10-08
申请人： NTN CORPORATION
发明人： Takayuki KAWAMURA , Ryouta KONDOU , Makoto SEKI , Susumu YAMAJI
IPC分类号： F16C33/66 , C10M107/02 , C10M115/08 , C10M169/02 , F16C19/18
CPC分类号： F16C33/6633 , C10M107/02 , C10M115/08 , C10M169/02 , F16C19/183 , F16C2326/02
摘要： To provide an axle bearing having a low torque property and superior bearing lifetime. A hub bearing 6 is configured to rotatably support a wheel of a vehicle, and has a grease composition 10 sealed in an inner space thereof. The grease composition 10 contains a base oil and a thickener. The shear stress of the grease composition at the shear rate of 1,000-10,000 s−1 at 25° C. is 3,000 Pa or less. The viscosity of the grease composition is 1 Pas or less. The yield stress of the grease composition at 25° C. measured by a dynamic viscoelasticity analysis method using a rheometer is 1,300-3,000 Pa.
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公开(公告)号：US20240052887A1
公开(公告)日：2024-02-15
申请号：US18268242
申请日：2021-12-22
申请人： STT INC. , NTN CORPORATION
摘要： To provide a rolling bearing having superior handling property and creep resistance. A rolling bearing 1 includes an inner ring 2 and an outer ring 3 that are raceway rings, and a plurality of balls 4 interposed between the inner ring and the outer ring. The outer ring 3 is fitted to a housing 10. The rolling bearing 1 includes a surface coating film 8 on an outer ring outer diametrical surface 3a that is a fitting surface with the housing 10. The surface coating film 8 contains: a binder containing two or more kinds of thermosetting resins having different average molecular weights; and a solid lubricant. The solid lubricant contains molybdenum disulfide, polytetrafluoroethylene resin, and graphite.
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公开(公告)号：US20240035515A1
公开(公告)日：2024-02-01
申请号：US18025379
申请日：2021-09-16
申请人： NTN Corporation
发明人： Naoki FUJIMURA , Masahiro YAMADA , Chikara OHKI
CPC分类号： F16C33/62 , F16C19/06 , C21D9/40 , C21D1/18 , C21D1/74 , C23C8/32 , C21D2211/003 , C21D2211/008
摘要： A bearing part (10) is composed of a steel, and has a quench-hardened layer (11) in a surface of the bearing part. The quench-hardened layer includes a plurality of martensite crystal grains. The plurality of martensite crystal grains are classified into a first group and a second group. A minimum value of crystal grain sizes of the martensite crystal grains belonging to the first group is larger than a maximum value of crystal grain sizes of the martensite crystal grains belonging to the second group. A value obtained by dividing a total area of the martensite crystal grains belonging to the first group by the total area of the plurality of martensite crystal grains is more than or equal to 0.3. A value obtained by dividing, by the total area of the plurality of martensite crystal grains, a total area of the martensite crystal grains belonging to the first group except for a martensite crystal grain that has a minimum crystal grain size and that belongs to the first group is less than 0.3. An average grain size of the martensite crystal grains belonging to the first group is less than or equal to 1.5 μm. The quench-hardened layer (11) further includes a plurality of cementite grains. A number density of cementite grains each having a grain size of more than or equal to 1 μm is more than or equal to 0.025/μm2.
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公开(公告)号：US20230418275A1
公开(公告)日：2023-12-28
申请号：US18243685
申请日：2023-09-08
申请人： NTN CORPORATION
发明人： Hiroyuki IWANAGA , Takashi HASEBA
CPC分类号： G05B23/0221 , G16Y40/20 , G16Y40/10
摘要： The condition monitoring system is for monitoring the conditions of a piece of equipment and includes: a sensor configured to be installed to the piece of equipment; a data instrumentation unit configured to receive a sensing signal from the sensor to acquire instrumentation data from the sensing signal under a predefined instrumentation condition; and a data diagnosis unit configured to receive the instrumentation data from the data instrumentation unit and use the instrumentation data to perform a diagnosis process to diagnose the conditions of the piece of equipment. The data diagnosis unit includes an edge application and an industrial IoT platform. The edge application includes a data collection and analysis module, and the data collection and analysis module is configured to calculate a feature for the instrumentation data from the data instrumentation unit and broadcast the feature to the industrial IoT platform.
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公开(公告)号：US11841051B2
公开(公告)日：2023-12-12
申请号：US17616474
申请日：2020-06-05
申请人： NTN Corporation
CPC分类号： F16C33/6651 , F16C19/364 , F16C33/4635 , F16C33/4676 , F16C33/4682
摘要： In a tapered roller bearing, a large-diameter-side annular portion includes large-diameter-side pocket surfaces opposed to large end surfaces of respective tapered rollers; and oil retaining recesses each having an opening spanning an inner peripheral surface of the large-diameter-side annular portion and each of the large-diameter-side pocket surfaces. Each of the oil retaining recesses has an inner surface having a radially inwardly facing surface portion which is an inclined surface that is radially inwardly inclined toward the corresponding tapered roller.
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公开(公告)号：US20230356777A1
公开(公告)日：2023-11-09
申请号：US18223143
申请日：2023-07-18
申请人： NTN CORPORATION
发明人： ISHIHARA Norio , ITOU Atsushi
CPC分类号： B62D7/18 , B62D15/023
摘要： Provided is a steering system which includes a hub unit with a steering function and a control device. A steering actuator includes a motor and a linear drive mechanism configured to convert a rotational output from the motor to a linear motion. An angle sensor is configured to sense a rotational angle of the motor and capable of generating two or more angle sensor values. A position sensor is configured to sense a position of the linear drive mechanism which represents an amount of displacement of an output rod and capable of outputting the same in the form of a position sensor value. The control device is configured to compare each of the angle sensor values sensed and generated by the angle sensor against the position sensor value sensed by and output from the position sensor to determine whether any one of the angle sensor values is incorrect.
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公开(公告)号：US20230340989A1
公开(公告)日：2023-10-26
申请号：US17799350
申请日：2021-01-19
申请人： NTN Corporation
发明人： Tomoki KAKUKO
CPC分类号： F16C19/181 , F16C41/00 , F16C2233/00 , F16C2326/02
摘要： In a bearing cap in which a sensor support part is formed on a bottom surface section of a cap body and in which an insertion hole for a rotational speed sensor is formed in the sensor support part, a recess that accommodates a tip portion of the rotational speed sensor is formed in the portion of the bottom surface section where the sensor support part is formed. The sensor support part includes a first wall section and a second wall section that are disposed, facing each other across a virtual line L passing through a center axis G1 of the bottom surface section and a center axis G2 of the insertion hole, and that are formed along the circumferential edge of the recess. Protrusions protruding from the bottom surface section are continuously provided on the outer circumferential surfaces of the first wall section and the second wall section.
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公开(公告)号：US11773901B2
公开(公告)日：2023-10-03
申请号：US17486011
申请日：2021-09-27
申请人： NTN CORPORATION
CPC分类号： F16C23/08 , F16C19/38 , F16C23/086 , F16C33/34 , F16C33/49 , F16C2206/04 , F16C2223/30 , F16C2240/54 , F16C2240/60
摘要： Provided is a self-aligning roller bearing for supporting a main shaft of a wind power generator, the self-aligning roller bearing including an inner ring, an outer ring, two rows of rollers, and retainers. Each of the rollers has an outer peripheral surface formed with a DLC coating having a multilayer structure. The DLC coating has a film thickness of 2.0 μm or larger. A base material of each of the rollers has an external surface having a surface roughness of Ra≤0.3 and RΔq≤0.05. The DLC coating having the multilayer structure includes layers having stepwisely increasing film hardnesses such that a layer situated closer to outside has a higher hardness.
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