NTN Corporation

Kuwana, Japan

NTN Corporation

Kuwana, Japan
SEARCH FILTERS
Time filter
Source Type

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: 2017-01-25

One object of the present invention is to provide a wheel bearing apparatus which can improve the workability in press-fitting operation of a protective cover and sealability in the fitting section as well as workability in the manufacturing steps and accordingly the reliability in quality of the wheel bearing apparatus. According to the present invention, there is provided a wheel bearing apparatus comprising an outer member; an inner member including a hub wheel and at least one inner ring; double row rolling elements contained between the outer raceway surfaces and inner raceway surfaces respectively of the outer member and the inner member; and a cup-shaped steel protection cover mounted on the inner-side end of the outer member characterized in that the fitting portion of the protection cover comprises a cylindrical portion adapted to be metal-contact fitted into a cylindrical fitting surface formed on the inner circumference of the end of the outer member and a radially reduced portion axially extending from the cylindrical portion; that an elastic member of synthetic rubber is integrally adhered to the radially reduced portion via vulcanizing adhesion, the elastic member comprising an annular projection radially outwardly projecting from the outer circumference of the cylindrical portion and a contact lip radially outwardly extending with an inclination at the inner-side of the annular projection; and that when the protection cover is fitted into the outer member, the annular projection is closely contacted with the fitting surface with being elastically deformed and the contact lip is elastically contacted with the inner-side end of the outer member.


Patent
NTN Corporation | Date: 2017-01-18

A wind turbine (100) includes vibration sensors (90A-90F) for detecting conditions of apparatuses in the wind turbine (100). Each of detection outputs of the vibration sensors (90A-90F) is transmitted to an information processing device (200). The information processing device (200) is arranged inside a support column (40) of the wind turbine (100). The information processing device (200) transmits the detection outputs to a management server (300) over a network (900).


Patent
NTN Corporation | Date: 2017-02-01

A rotation transmission device includes an electromagnetic clutch (50) including an armature (51), a rotor (52) having an outer tubular portion (52a) and an inner tubular portion (52b), and an electromagnet (53). A bearing support tube (57) is provided at the outer end surface of a core (53b) supporting an electromagnetic coil (53a) of the electromagnet (53). A bearing (58) is mounted in the bearing support tube (57) so as to be axially fixed in position and not to be pulled out of the bearing support tube (57). The small-diameter tubular portion (52c) is provided at the end of the inner tubular portion (52b) of the rotor (52), and press-fitted in the bearing (58) such that the rotor (52) and the electromagnet (53) form a unit. This makes it easier to assemble the electromagnetic clutch (50), and to control the overlap distance between the outer tubular portion (52a) of the rotor (52) and the core (53b) of the electromagnet (53).


Patent
NTN Corporation | Date: 2017-03-29

Provided is an electric brake device that is able to achieve redundancy when an abnormality occurs in a load sensor, without increasing the size of the load sensor. The electric brake device includes a brake rotor, a friction pad, an electric motor (2), a transmission mechanism, braking force command section (26a), braking force estimation section (30), motor rotation angle detector (28), and a controller (7). The braking force estimation section (30) includes a load sensor (13) configured to detect elastic deformation of a determined member forming the electric brake device. The controller (7) includes sensor abnormality detector (37) configured to store a sensor output of the load sensor (13) at a motor rotation angle at which a braking force becomes zero, and infer the occurrence of plastic deformation in the load sensor (13) from transition of the stored sensor output.


Patent
NTN Corporation | Date: 2017-04-05

A wheel bearing apparatus for rotatably supporting a wheel includes: an inner member 10 having two rows of raceway grooves 16a, 16b on an outer circumference thereof; an outer member 30 having two rows of raceway grooves 36a, 36b on an inner circumference thereof; and a plurality of rolling elements 28a, 28b interposed between the raceway grooves 16a, 16b of the inner member 10 and the raceway grooves 36a, 36b of the outer member 30. The raceway grooves 16a, 16b of the inner member 10 and the raceway grooves 36a, 36b of the outer member 30 are formed by hardened steel cutting. In relation to at least the raceway groove 16b on the outboard side out of the raceway grooves 16a, 16b of the inner member 10, h/d exceeds 0.50 where h is the depth of the groove and d is the diameter of the rolling elements. This provides a wheel bearing apparatus being compact and capable of withstanding a high applied load without inviting an increase in the size of the bearing.


Patent
NTN Corporation | Date: 2017-09-27

According to the present invention, there is provided a gear comprising teeth formed on the outer circumference of the gear and a central hole formed at the center of the gear; an intermediate region between a peripheral portion near the teeth and a boss near the central hole formed to have a thickness thinner than those of the peripheral portion and the boss; a plurality of weight-lightening apertures formed circumferentially and equidistantly in the intermediate region; and a vibration absorbing member of synthetic rubber formed on both side surfaces of the intermediate region integrally each other through the weight-lightening apertures, the vibration absorbing member is attached to the radially outer side than an outer diameter of a bearing to be arranged adjacent to the vibration absorbing member. According to the present invention, there is also provided an electric actuator comprising an electric motor mounted on a housing; a speed reduction mechanism for transmitting rotational force of the motor to a ball screw mechanism; and the ball screw mechanism being able to convert the rotational motion of the electric motor to the axial linear motion of a driving shaft and comprising a nut and a screw shaft; the nut being formed with a helical screw groove on its inner circumference, securing on its outer circumference an output gear forming part of the speed reduction mechanism and the screw shaft being formed on its outer circumference with a helical screw groove corresponding to the helical screw groove of the nut, adapted to be inserted into the nut via a large number of balls, and supported not rotationally but axially movably relative to the housing characterized in that the output gear is secured on the outer circumference of the nut with being sandwiched by an inner ring of one supporting bearing and a flange portion of the nut, and that the output gear is configured by a gear defined in any one of claims 1 to 5.


Patent
NTN Corporation | Date: 2017-09-27

A corrugated portion is formed in one end edge portion of the metallic shaft main body (2), and a triangular corrugated portion (11) is formed in an end edge portion of the shaft auxiliary body (3) on the metallic shaft main body side. The metallic shaft main body (2) and the shaft auxiliary body (3) are integrated by being linearly arranged by way of meshing that brings a side of the triangular corrugated portion (9) on the main body side and a side of the triangular corrugated portion (11) on the auxiliary body side into contact with each other. A fiber orientation angle () of the fiber reinforced plastic of the shaft auxiliary body (3) is set so as to be in the same direction as a direction of stress generated in a hypotenuse of each triangular portion under a torque load state.


Patent
NTN Corporation | Date: 2017-09-27

An electric linear motion actuator is provided which includes an outer ring member (21), a rotary shaft (34), planetary rollers (49), and a carrier (40) including a disk (41a), and in which the outer ring member (21) is formed on its inner diameter surface with a helical rib (51), and each of the planetary rollers (49) is formed in its outer diameter surface with circumferential grooves (52) in which the helical rib (51) is engaged. When the rotary shaft (34) rotates, due to the frictional contact of the planetary rollers (49) with the rotary shaft (34), the planetary rollers (49) rotate about their axes while revolving around the rotary shaft (34) so that the outer ring member (21) axially linearly moves. The electric linear motion actuator further includes thrust roller and retainer assemblies (53) each mounted between one of the planetary roller (49) and the surface of the disk (41a) of the carrier (40) that is opposed to the one of the planetary rollers, and each guided by a raceway (49a), i.e., an end surface of the corresponding planetary roller (49). The electric linear motion actuator further includes a common raceway disk (57) common to all of the thrust roller and retainer assemblies (53), the common raceway disk being mounted between the thrust roller and retainer assemblies (53) and the surface of the disk of the carrier that is opposed to the thrust roller and retainer assemblies. Therefore, the number of components constituting such a thrust roller bearing can be reduced, and the carrier (40) can be easily assembled.

Loading NTN Corporation collaborators
Loading NTN Corporation collaborators