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 141/10 - Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups , each of these compounds being essential at least one of them being an organic phosphorus-containing compound
C10M 169/06 - Mixtures of thickeners and additives
F16C 33/78 - Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
C10M 107/02 - Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
C10M 115/08 - Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
Provided is a preload inspection method for a wheel bearing device enabling more accurate checking of preload. The invention comprises: a press-fitting step S02 for press-fitting an inner ring 4 to a small-diameter stepped part 3a; a first bearing preload value calculation step S03 for calculating a first bearing preload value P1 on the basis of a first axial direction negative clearance G1; a first rotating torque measurement step S05 for measuring a first rotating torque Ta after the press-fitting step; a swaging step S06 for swaging the small-diameter stepped part to the inner ring after the first rotating torque measurement step; a second bearing preload value calculation step S07 for calculating a second bearing preload value P2 on the basis of a second axial direction negative clearance G2; a second rotating torque measurement step S08 for measuring a second rotating torque Tb after the swaging step; a third bearing preload value calculation step S09 for calculating a third bearing preload value P3 by adding, to the first bearing preload value, a preload change amount ?P based on a differential torque ?T between the first rotating torque and the second rotating torque; and a determination step S10 for determining the suitability of the preload from the second bearing preload value and the third bearing preload value.
G01L 5/00 - Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
F16C 19/18 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
F16C 25/08 - Ball or roller bearings self-adjusting
F16C 33/78 - Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
An electric actuator comprising a case, an electric motor 5 built into the case, and a motion conversion mechanism 4 for converting rotational motion of the electric motor 5 into linear motion, with the electric motor 5 being fixed to the case (gear case 10) at one end of the electric motor 5 in the axial direction thereof, wherein at the other end of the electric motor 5 opposite from the one end that is fixed to the case (gear case 10), a first elastic member 50 is provided between the outer peripheral surface of the electric motor 5 and the inner peripheral surface of the case (motor case 60).
This electric actuator 1 comprises a motor 5 and a motion conversion mechanism 4 for converting rotational motion produced through the driving of the motor 5 into a prescribed motion. A magnet 31 is disposed, as a sensor target, on a movable part moving in the prescribed motion, and a magnetic sensor 32 for detecting position information for the magnet 31 is disposed near the magnet 31. A magnetic shielding plate 34 is disposed between the motor 5 and magnetic sensor 32, and the external surface 5e of the motor 5 and the internal surface 34a of the magnetic shielding plate 34 face each other across a prescribed gap 35.
An electric actuator 1 is provided with a drive section 2, a drive force transmitting mechanism 3, a motion converting mechanism 4, a housing space which houses the drive section 2, the drive force transmitting mechanism 3, and the motion converting mechanism 4, and a vent section 5. The vent section 5 is provided with a vent hole 53 which extends through a partition wall for defining the drive force transmitting mechanism 3, an air flow passage 46 which communicates with the vent hole 53, and a filter 60.
This electric actuator is provided with an electric motor (5), and a motion converting mechanism (4) which converts a rotating motion of the electric motor (5) into linear motion, wherein the motion converting mechanism (4) includes a nut (17) which is supported rotatably, and a screw shaft (18) which moves in an axial direction in conjunction with rotation of the nut (17), and the electric actuator is provided with a case (20) covering an axial-direction end surface (18b) of the screw shaft (18), and wherein a resilient member (30) is provided between the axial-direction end surface (18b) of the screw shaft (18) and an opposing surface (20b) of the case (20), opposing the axial-direction end surface (18b).
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 169/06 - Mixtures of thickeners and additives
C10M 115/08 - Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
C10M 125/22 - Compounds containing sulfur, selenium or tellurium
C10M 129/10 - Hydroxy compounds having hydroxy groups bound to a carbon atom of a six-membered aromatic ring
C10M 135/00 - Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
C10M 135/10 - Sulfonic acids or derivatives thereof
C10M 135/18 - Thio-acids; Thiocyanates; Derivatives thereof having a carbon-to-sulfur double bond thiocarbamic type, e.g. containing the groups
C10M 159/22 - Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products containing phenol radicals
C10M 159/24 - Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products containing sulfonic radicals
F16D 3/20 - Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
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.
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