To provide a grease composition that is capable of effectively preventing an early-flaking caused by hydrogen embrittlement, and a grease-sealed bearing in which the grease composition is sealed. A grease composition 7 contains a base oil, a thickener, and an additive. The additive contains sodium molybdate, and zinc alkyldithiophosphate having a 1-30C primary alkyl group. The grease composition contains 0.1-5 mass% of the sodium molybdate relative to the whole of the grease composition. The grease composition contains 0.1-5 mass% of the zinc alkyldithiophosphate relative to the whole of the grease composition.
C10M 107/02 - Polymères d'hydrocarburesPolymères d'hydrocarbures modifiés par oxydation
C10M 115/08 - Compositions lubrifiantes caractérisées en ce que l'épaississant est un composé organique non macromoléculaire, autre qu'un acide carboxylique ou ses sels contenant de l'azote
C10M 141/10 - Compositions lubrifiantes caractérisées en ce que l'additif est un mélange d'au moins deux composés couverts par plus d'un des groupes principaux , chacun de ces composés étant un composé essentiel l'un d'eux, au moins, étant un composé organique contenant du phosphore
C10M 169/06 - Mélanges d'épaississants et d'additifs
F16C 33/78 - Dispositifs d'étanchéité pour roulements à billes ou à rouleaux avec diaphragme, disque ou bague, avec ou sans parties élastiques
Provided is a quiet propeller (1) including a propeller blade having such a pitch angle not at its root portion but at its blade end edge portion with respect to a relative flow in the rotational direction, as to raise the internal pressure of a liquid thereby to eliminate a cavity, a water bubble or a cavitation at the blade root portion at the time of a high-speed rotation so that the propeller is rotated at a high speed by a small prime mover and by a prime mover capable of moving much fluid backward. In the quiet propeller (1), a propeller blade (3) is curved backward at its leading end portion to form a slope portion 3(d), and a rotational front side end portion (3a) in the slope portion (3d) is formed into an arcuate shape in the side view whereas a rotational rear side end portion (3b) is so gradually extended backward from the rotational front side end portion (3a) as to become straight from the blade root to the blade end, thereby to form a deflecting slope face (3e). At the rotating time, the fluid is pushed toward the back axis from the deflecting slope face (3e) in the slope portion.
The present invention provides a grease composition for use in constant velocity joints, which comprises the following components (a) to (g) and a constant velocity joint comprising the grease composition sealed or encapsulated therein: (a) a base oil;
(b) a diurea thickener represented by the following general formula: R1NH-CO-NH-C6H4-p-CH2-C6H4-p-NH-CO-NHR2
wherein R1 and R2 each independently represents an alkyl group having 8 to 20 carbon atoms, an aryl group having 6 to 12 carbon atoms or a cycloalkyl group having 6 to 12 carbon atoms;
(c) a molybdenum dialkyl dithiocarbamate insoluble in the base oil; (d) a molybdenum dialkyl dithiocarbamate soluble in the base oil; (e) molybdenum disulfide;
(f) at least one member selected from the group consisting of calcium phenate and calcium sulfonate; and
(g) a sulfur-containing extreme-pressure agent free of phosphorus.
The grease composition can efficiently prevent a temperature rise of a constant velocity joint and can impart excellent durability to the joint.
C10M 115/08 - Compositions lubrifiantes caractérisées en ce que l'épaississant est un composé organique non macromoléculaire, autre qu'un acide carboxylique ou ses sels contenant de l'azote
C10M 125/22 - Composés contenant du soufre, du sélénium ou du tellure
C10M 129/10 - Composés hydroxylés comportant des groupes hydroxyle liés à un atome de carbone d'un cycle aromatique à six chaînons
C10M 135/00 - Compositions lubrifiantes caractérisées en ce que l'additif est un composé organique non macromoléculaire contenant du soufre, du sélénium ou du tellure
C10M 135/18 - ThioacidesThiocyanatesLeurs dérivés comportant une liaison double carbone-soufre du type thiocarbamique, c.-à-d. contenant les groupes
C10M 159/22 - Mélanges réactionnels comportant un excès de base neutralisante, p. ex. produits appelés superbasiques ou hautement basiques contenant des radicaux phénol
C10M 159/24 - Mélanges réactionnels comportant un excès de base neutralisante, p. ex. produits appelés superbasiques ou hautement basiques contenant des radicaux sulfoniques
C10M 169/06 - Mélanges d'épaississants et d'additifs
F16D 3/20 - Joints universels dans lesquels la flexibilité est réalisée par pivots ou organes de liaisons coulissants ou roulants une des pièces d'accouplement pénétrant dans un manchon de l'autre pièce d'accouplement et reliée à celle-ci par des organes coulissants ou tournants
The present invention relates to a vertical axis windmill and a wind power generation system, and especially to a vertical axis windmill in which a support frame is provided as wind power dam to form a plurality of shaft-installation sections, a plurality of vertically long blades each of which has a tilted part at the upper and lower ends respectively being disposed in multi-levels to improve wind-receiving rate with increased wind-receiving area and wind-receiving power thereby providing a wind power generator with low installation cost and increased total power generation per a certain area.
F03D 3/02 - Mécanismes moteurs à vent avec axe de rotation sensiblement perpendiculaire au flux d'air pénétrant dans le rotor comportant plusieurs rotors
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