Nippon Oil Corporation

Nsk Corporation

Nippon Mitsubishi Oil Corporation

Jx Nippon Oil Energy Corporation

Kao Corporation

Nippon Oil Company

Yuji Shimomura

Katsuya Takigawa

Satoshi Suda

Ken Sawada

Kazuo Tagawa

Hideo Yokota

Toshio Yoshida

Hiroyuki Hoshino

Shozaburo Konishi

Hajime Nakao

Masahiro Hata

Eiji Akiyama

Junichi Shibata

Shinichi Mitsumoto

Hiroyuki Hirano

Tomoyuki Aizawa

Dai Kinno

Hiroyasu Yoshioka

Kazuya Yamada

Yasuaki Abe

Kanta Sato

Takashi Imanishi

Eiji Inoue

Hiroki Nishii

Masanori Saito

Hiroshi Hasegawa

Takeshi Okido

Umekichi Sasaki

Tetsu Takehara

Hiroshi Kawahara

Jiro Hashimoto

Yasumi Watanabe

Shin Yamamoto

Toshiro Toyoda

Hidenobu Magami

Masataka Negishi

Sadayuki Tanaka

Toshihiko Sato

Daisuke Fujimori

Toshiharu Takamura

Reona Umei

Toshiyuki Obata

A linear motion actuator has a ball screw device having a screw shaft, a nut, and a plurality of balls, a piston mounted on one end of the screw shaft, and a stroke limiting mechanism setting an operation starting point in time of the screw shaft toward a first direction pointed by the one end. The nut has one end face directed to the first direction and a protruding part protruding from the one end face.

Linear motion actuator

In the ball screw device, the circulation path that returns balls from the end point to the start point of the load path includes a return path, scooping paths, and connecting paths. The scooping path has an arc-shaped center line that is curved outward in the radial direction as going toward the reference imaginary flat plane including the center axis of the screw shaft and the center line of the return path in the circumferential direction. The connecting path is arranged on the reference imaginary flat plane and includes a straight path having a linear center line extending in a direction orthogonal to the center axis of the screw shaft. When the radius of curvature of the center line of the scooping path is R, the scooping angle is &#x3b8;, and the entire length of the straight path is S, Rcos(90&#xb0;&#x2212;&#x3b8;)+S is made larger than the diameter of the balls.

Ball screw device

A ball screw device has a screw shaft; a nut; a circulation part; and balls; a housing concave groove provided on the outer circumferential surface of the nut and linearly extending in the axial direction and opening to end surfaces on both outer sides in the axial direction of the nut, a circulation part arranged inside the housing concave groove, and the circulation part being prevented from displacing toward the outer side in the radial direction and displacing in the circumferential direction with respect to the nut by engaging an engaging convex portion of a fixing portion provided in the end portion on each of both outer sides in the axial direction of the circulation part with an engaging recess portion provided in the end portion of each of both outer sides in the axial direction of the housing concave groove.

A friction roller-type reduction gear includes a sun roller concentric with an input shaft, a ring roller having a stationary ring roller element and a moveable ring roller element, intermediate rollers in rolling contact with an outer peripheral surface of the sun roller and an inner peripheral surface of the ring roller, a coupling part coupling the ring roller and the output shaft, and a loading cam mechanism having a cam ring for changing contact surface pressure of each rolling contact surface. The outer surface of the sun roller is a concave curved surface of which a shape of an outer edge in an axial cross-section is a single circular arc-shaped concave curve, and an outer surface of the intermediate roller is a convex curved surface of which a shape of an outer edge in an axial cross-section is a single circular arc-shaped convex curve.

Friction roller-type reduction gear

The working fluid composition for a refrigerating machine of the invention is characterized by comprising an ester of a polyhydric alcohol and a fatty acid with a content of a C5-C9 branched fatty acid of 50-100% by mole, and a fluoropropene refrigerant and/or trifluoroiodomethane refrigerant. The refrigerating machine oil of the invention is characterized by comprising an ester of a polyhydric alcohol and a fatty acid with a content of a C5-C9 branched fatty acid of 50-100% by mole, and by being used together with a fluoropropene refrigerant and/or trifluoroiodomethane refrigerant.

Refrigerator oil and working fluid composition for refrigerator

The working fluid composition for a refrigerating machine of this invention comprises a base oil containing an ether-based compound, an amine salt of an acidic phosphoric acid ester, at least one compound selected from the group consisting of amine-based antioxidants, metal inactivating agents and alicyclic epoxy compounds, and an unsaturated fluorinated hydrocarbon refrigerant. The refrigerating machine oil of the invention comprises a base oil containing an ether-based compound, an amine salt of an acidic phosphoric acid ester, and at least one compound selected from the group consisting of amine-based antioxidants, metal inactivating agents and alicyclic epoxy compounds, and it is to be used together with an unsaturated fluorinated hydrocarbon refrigerant.

Refrigerant oil for freezers and operating fluid composition for freezers

A toroidal continuously variable transmission of the present invention comprises: input side disks () and output side disks () being supported concentric with each other such that the disks can rotate freely; a trunnion () that comprises end sections () on both ends on which tilt shafts () that are concentric with each other are provided, and a support beam section () that extends between both end sections (), the trunnion () being capable of pivotally displacing around the tilt shafts (); a thrust rolling bearing (); and a power roller () that is supported to the inside surface of the trunnion () by way of the thrust rolling bearing () such that it rotates freely; wherein the support beam section () comprises an inside surface having a cylindrical convex surface (); the thrust rolling bearing () comprises an outer race () having an outside surface with a concave section () that fits with the cylindrical convex surface () of the support beam section (), and a plurality of rolling bodies () that are located between the power roller () and a track of an outer race (); and the concave section () of the outer race () has side surface sections () on both sides in the width direction, fits with the cylindrical convex surface () by the cylindrical convex surface () coming in contact with both side surface sections ().

Toroidal continuously variable transmission

The first refrigerating machine oil composition of the invention comprises a predetermined base oil, and at least one ester additive selected from esters of a monobasic fatty acid having 12 or more carbon atoms and a monohydric alcohol having 1-24 carbon atoms, and an ester of a chain-like dibasic acid and a monohydric alcohol. The second refrigerating machine oil composition of the invention comprises a predetermined base oil, and at least one oxygen-containing compound selected from the following (A1)-(A6). The third refrigerating machine oil composition of the invention comprises a predetermined base oil, and at least one oxygen-containing compound selected from the following (A1), (A2), (A4), (A7) and (A8).

Refrigerating machine oil compositions

The refrigerating machine oil of the invention is characterized by comprising an ester of a polyhydric alcohol and fatty acids with a content of a C10-C13 branched fatty acid of 50% by mole or greater. The working fluid composition for a refrigerating machine of the invention is characterized in that the working fluid composition comprises an ester of a polyhydric alcohol and fatty acids with a content of a C10-C13 branched fatty acid of 50% by mole or greater, and a refrigerant.

Refrigerator oil and working fluid composition for refrigerating machine

The present invention provides a refrigerating machine oil, a compressor oil composition, a hydraulic oil composition, a metalworking oil composition, a heat treating oil composition, a lubricating oil composition for machine tools and a lubricating oil composition which comprise a lubricating oil base oil having % Cof not more than 2, % C/% Cof not less than 6 and an iodine value of not more than 2.5.

Growing community of inventors

Yokohama, Japan

Yuji Shimomura