NTN Corporation

Kuwana, Japan

NTN Corporation

Kuwana, Japan

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Patent
NTN Corporation | Date: 2017-05-17

In a tripod type constant velocity universal joint 1, when D1 represents a large inner diameter being a diameter of a circle connecting radially outer end portions of roller guide surfaces 7 and D2 represents a small inner diameter being a diameter of a circle connecting radially inner end portions of the roller guide surfaces 7, a ratio D2/D1 between the small inner diameter D2 and the large inner diameter D1 is set within a range of from 0.73 to 0.80. Further, when d represents a large diameter of a spline formed in a trunnion hub 8 of a tripod member 3 and PCD represents a pitch circle diameter of the roller guide surfaces 7, a ratio d/PCD between the large diameter d and the pitch circle diameter PCD is set to 0.60 or more.


Patent
NTN Corporation | Date: 2017-05-17

A method of manufacturing a rolling bearing ring includes preparing a coil material (2) and a press machine (3) for obtaining a rolling bearing ring from the coil material (2), setting the coil material (2) on the press machine (3), and obtaining the rolling bearing ring by heating the coil material (2) on the press machine (3) to a temperature not lower than an A_(1) transformation point, thereafter punching a part of the coil material (2) into a ring form, and thereafter quenching a formed object (2A) on the press machine (3).


Patent
Ntn Corporation | Date: 2017-02-08

A magnetic load sensor is provided which is high in axial rigidity. The load sensor includes a pair of parallel plate coupled together by coupling pieces. The coupling pieces are inclined relative to the axial direction such that when an axial load is applied to the parallel plates, the parallel plates are displaced relative to each other in a direction perpendicular to the axial direction, due to deflection of the coupling pieces. A magnetic target is mounted to the parallel plate, and a magnetic sensor element is mounted to the parallel plate such that when the parallel plates are displaced relative to each other in the direction perpendicular to the axial direction, the magnetic target and the magnetic sensor element are displaced relative to each other in the direction perpendicular to the axial direction.


Patent
Ntn Corporation | Date: 2017-02-06

Provided is a portable diagnosis data measurement transmission device that assuredly allows a server to perform malfunction diagnosis based on measurement data without influence of a communication status. The portable diagnosis data measurement transmission device (1) includes: a portable information terminal (2) connected to a server (6) via a communication line network (7); a physical quantity measuring equipment (3) configured to measure a physical quantity of a diagnosis object (4) including a mechanical component; and an A/D converter (5). Whether transmission of a block of measurement data has been completed is confirmed. The measurement data is temporarily stored until completion of the transmission is confirmed. The measurement data is caused to be retransmitted when a communication status shifts to a set allowable state.


A rolling component material of the present invention is a steel material for a rolling component to be used in an environment in which hydrogen enters steel, and is a material used for a rolling component of a rolling bearing, for example, a bearing ring. In the rolling component material, a non-metallic inclusion of the steel material has a radius not greater than a radius d determined by the following formula (1) and not less than 1.0 m, where Pmax is defined as a maximum contact surface pressure acting on a rolling surface of the rolling component, d=64729(Pmax/4)^(1.441)(1).


Patent
NTN Corporation | Date: 2017-02-04

A wheel bearing apparatus has an outer member, an inner member and double row rolling elements contained between outer raceway surfaces and inner raceway surfaces, respectively, of the outer member and the inner member. A vibration damping mechanism is mounted on a portion of the outer member or the inner member except at portions engaging with mating components.


Patent
NTN Corporation | Date: 2017-02-04

A wheel bearing apparatus has an outer member, an inner member and double row rolling elements contained between outer raceway surfaces and inner raceway surfaces, respectively, of the outer member and the inner member. A vibration damping mechanism is mounted on a portion of the outer member or the inner member except at portions engaging with mating components.


The present invention relates to a support bearing for a constant velocity joint in which: a ball rotation surface (33) of a bearing (4) is formed on a shaft section (32) of an outer ring (31) of an inboard-side constant velocity joint (3); a support bearing outer ring (42) is disposed to face the ball rotation surface (33); and balls (43) as a plurality of rolling elements which are held by a retainer (44) are disposed between the ball rotation surface (33) and the rotation surface of the support bearing outer ring (42). With this arrangement, the present invention makes it possible to decrease size and weight.


Patent
NTN Corporation | Date: 2017-05-24

The electric brake device includes an electric motor (4), a brake rotor, a friction pad, a conversion mechanism (6), a braking force command section (18a), a braking force estimation section (24), a controller (2), and a power supply device (30). The controller (2) includes: a power determination section (28) to determine whether an amount of remaining power that can be supplied from a power supply device (3) to the electric motor (4) has become equal to or less than a determined value; and a residual pressure cancellation section (29) to cancel a residual pressure of a braking force by driving the electric motor (4) in a direction opposite to a brake pressing direction such that an estimated value of the braking force obtained by the braking force estimation section (24) becomes equal to or less than a set value, when the power determination section (28) determines that the amount of remaining power has become equal to or less than the determined value.


Patent
NTN Corporation | Date: 2017-07-19

Provided is a railway vehicle bearing abnormality sensing system that can accurately perform abnormality determination for railway vehicle bearings. The system (100) senses an abnormality in a plurality of rolling bearings (17) housed in an axle box (3) provided to a bogie (2). The system (100) includes: vibration detection devices (15) each detecting vibration of a rolling bearing; an analysis device (6) determining an abnormality in the bearings (17) on the basis of detection data detected by the device (15); and reception response detection start module (13) receiving a detection start signal and cause the device (15) to detect vibration of the rolling bearing. The system (100) further includes a measurement start command transmitting device (4), installed apart from a railway vehicle, transmitting the detection start signal to the module (13).

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