Kuwana, Japan
Kuwana, Japan

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Patent
NTN Corporation | Date: 2017-05-10

The present invention provides a lubricant composition which can be used as a lubricant for a rolling component, the composition capable of maintaining enhanced lubrication performance over a long period of time even under high temperature conditions such as temperatures of 180C or higher, and a rolling bearing including the lubricant composition sealed therein. A lubricant composition-sealed bearing 1 includes a lubricant composition 7 that is sealed in the peripheries of the rolling bodies 4. The lubricant composition 7 contains a base oil and an antioxidant. The base oil is an oil mixture of an alkyl diphenyl ether oil and at least one oil selected from a poly--olefin oil and an ester oil, and contains the alkyl diphenyl ether oil in an amount of 50% or more by weight of the total base oil. The antioxidant is 2,2,4-trimethyl-1,2-dihydroquinoline or a polymer thereof, and is contained in an amount of 0.1% to 10% by weight of the total lubricant composition.


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.

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