Nsk Corporation

Nks Ltd.

Yuko Kamamura

Hiroyuki Ikeda

Hisashi Machida

Hiroshi Terakubo

Hiroyuki Iwanami

Masanori Takahashi

Wataru Watanabe

Shoji Horike

Hiroki Mizuno

Takaji Iwasawa

Yasutami Matsumoto

Yukio Ooura

Masatake Ichimaru

Atsushi Kario

Yoshiro Ide

Shigeo Kudou

Suguru Sakakibara

A half toroidal CVT disk having an inner surface portion, an outer surface portion and a toroidal surface having a given machining allowance is centered with said inner surface portion worked prior to the heat treatment of said half toroidal CVT disk as the standard thereof, and then is chucked by a chuck mechanism. The toroidal surface of the chucked half toroidal CVT disk is ground by a grinding mechanism with the grinding wheel for grinding the half toroidal CVT disk in a state that one of said half toroidal CVT disk and said tool is inclined at a given angle with respect to the other.

Method of grinding half toroidal CVT disk

A centerless grinding apparatus () includes an outer diameter surface grinding wheel () for grinding the outer diameter surface of a work () of a substantially cylindrical shape, a regulating wheel () for supporting the outer diameter surface of the work () in conjunction with the outer diameter surface grinding wheel () and an end surface grinding wheel () for grinding the end surface of the work (). The end surface grinding wheel () grinds the end surface of the work () while the outer diameter surface grinding wheel () grinds the outer diameter surface of the work () in a state that the work () is disposed between the outer diameter surface grinding wheel () and the regulating wheel ().

Centerless grinding apparatus and centerless grinding method

A machining apparatusof an end face of a roller includes a rotatable inner disk, a cagehaving a pocket portionfor holding a plurality of rollersat predetermined intervals in a peripheral direction at an outer diameter portion of the inner diskand rotatable independently from the inner disk, and a drive belthung over outer diameter portions of the plurality of rollersheld by the inner diskand the cage, and by rotating the inner disk, the cageand the drive beltin predetermined directions, the rolleris revolved while being rotated and the end face of the roller is crowned by an elastic cup grinding wheel

Machining apparatus and machining method of work end face, roller and roller bearing

A roller bearing includes an inner ring, an outer ring, a plurality of cylindrical rollers each provided between rolling contact surfaces of the inner ring and the outer ring. Each of the cylindrical rollers includes an end face having a peripheral part that is crowned. A flange portion is formed at an outer circumferential face end part of the inner ring and/or an inner circumferential face end part of the outer ring. The peripheral part is crowned in a curving shape represented by an exponential function of y=a&#xb7;exp(&#x2212;b&#xb7;x); where a and b are constants, x is a distance from the rolling contact surface in a radial direction of the cylindrical roller, and y is a crowning fall-off amount from a central part of the end face of the cylindrical roller in an axial direction of the cylindrical roller.

Roller bearing

An intersection between a first circular arc traced around a given measuring point on a toroidal surface on one side by the extreme end of a segment with a length equal to the curvature radius of traction surfaces of discs and a second circular arc traced around a given measuring point on a toroidal surface on the other side by the extreme end of the segment is obtained in a cross section along the central axis of the power roller. A plurality of intersections are obtained by repeating the process for obtaining the intersection for each of different measuring points on the toroidal surfaces. That specific one of the intersections which is situated nearest to the reference surface of the power roller is selected and it is concluded that the selected intersection is the tilting center of the discs.

Power roller for toroidal type continuously variable transmisson

An internal grinding method for grinding an inner surface of a work having a straight line generatrix shape while performing an in-process inner-diameter size measurement intermittently through oscillation synchronized between a grindstone and a measurer; wherein a circumferential surface of the grindstone is trued into a shape inclined with respect to a moving direction of a X-axis slide table moving forward/backward relative to the work so that normal grinding force when the X-axis slide table moves backward is reduced, while the work is supported with inclination with respect to the moving direction of the X-axis slide table so that the X-axis slide table is oscillated in the moving direction.

Internal grinding method and internal grinding machine

Power roller for toroidal type continuously variable transmission

While rotating a spindle the circular hole is worked using a cutting tool Before or after the working operation of the circular hole a chuck is translated in a direction perpendicular to the rotation center axis of the spindle by a slider And, the flat surface as well as the stepped surfaces and inner surfaces which are respectively composed of partially tubular surfaces, are cut or worked.

Trunnion for half-toroidal-type continuously variable transmission and method for working the same

The inner surface of the input side disk is composed of a near-inside-diameter portion, namely, a first arc surface and a near-outside-diameter portion, namely, a second arc surface in such a manner that the first and second arc surfaces and are allowed to continue with each other smoothly. The first arc surface is formed as a single arc whose radius of curvature is R . Also, the second arc surface is recessed in the axial direction of the input side disk further than the extension of the single arc, and the second arc surface is formed so as to have a spiral curve.

Toroidal-type continuously variable transmission

A loading cam mechanism of a toroidal type continuously variable transmission is provided with a cam disc that rotates together with an input shaft. A cam surface is formed on the cam disc. The cam disc includes a disc portion having the cam surface formed thereon and a cylindrical portion protruding from the central portion of the cam surface. The cam disc further includes a lathe-turned portion formed by lathe turning, a milled surface formed by means of an end mill, and a ground surface formed by means of a grindstone. Formed on a corner portion between the cylindrical portion and the disc portion are a first corner curved surface worked by means of an arcuate portion on the distal end portion of the end mill and a second corner curved surface worked by means of an arcuate portion on the distal end portion of the grindstone.

Growing community of inventors

Kanagawa, Japan

Yuko Kamamura