摘要:
There is disclosed a hydraulic working oil composition which comprises in the form of a blend, a base oil having a C.sub.A content of at most 5%; 0.01 to 5% by weight of an (A) aminic antioxidant such as 4,4'-dioctyldiphenylamine; 0.01 to 5% by weight of a (B) phenolic antioxidant such as 2,6-ditert-butyl-4-methylphenol; 0.01 to 5% by weight of a (C) phosphoric ester such as tricresyl phosphate; and 0.001 to 5% by weight of a (D) fatty acid amide such as isostearic acid triethylenetetramide and/or polyhydric alcohol ester such as sorbitan monooleate each based on the whole amount of the composition.According to the present invention, there is provided the hydraulic working oil composition capable of effectively preventing premature deterioration of the working oil accompanying the trend towards high pressure and the sludge formation therein, being serviceable for a long period of time and at the same time, exhibiting stable working characteristics by eliminating the phenomenon of cylinder waviness, that is, a phenomenon of causing vibration and/or abnormal noise between a cylinder and a piston, between a rod and a (sealing) guide, or the like in a hydraulic working portion of hydraulic machinery.
摘要:
A lead frame for a semiconductor module comprises a lead frame member having first and second islands and including first, second and third groups of outer leads. The first and second groups of outer leads are located in one direction at opposed sides of the lead frame member, and the third group of outer leads are located between the first and second islands in the direction. When the first and second semiconductor chips are mounted on the first and second islands, respectively, and encapsulated separately with a resin layer, the third group of outer leads serve as external leads.
摘要:
A restriction flange is independently formed and then fitted on one end of each cylindrical holder in a sliding universal joint and abuts a rail portion surface of the transmitting groove to prevent inclination of the holder. The rail portion can also be formed independently of the outer member and then fixed thereto by bolting, welding or caulking.
摘要:
A method for extracting and removing water-soluble substances from a non-water-soluble fluid containing water-soluble substances by using water or an aqueous solution as the extractant and bringing the non-water-soluble fluid and the water or aqueous solution into contact with each other by means of filters.
摘要:
A propeller shaft in a motor vehicle includes a plurality of shaft members and a plurality of joints operatively coupled between the shaft members, between the engine of the motor vehicle and one of the shaft members, and between a differential coupled to drive wheels and one of the shaft members. At least one of the joints comprises a slidable tripod joint. The tripod joint gives the propeller shaft a desired torque transmission capability and axial sliding displacements, and enables the propeller shaft to have a practically sufficient service life for high-speed rotation.
摘要:
Disclosed is a cover tape which comprises at least a base layer (A), an intermediate layer (B), a peeling layer (C), the primary component of which is a thermoplastic resin, and a heat seal layer (D), the primary component of which is a thermoplastic resin that can be heat sealed to a carrier tape. The tensile storage modulus (c) of the thermoplastic resin that constitutes the peeling layer (C) is within the range of 1×106 Pa to 1×108 Pa. The tensile storage modulus (d) of the thermoplastic resin that constitutes the heat seal layer (D) is within the range of 1×108 Pa to 1×1010 Pa. The ratio of (c) and (d) satisfies 1×104≧(d)/(c)≧1×10. This kind of cover tape has the appropriate peel strength and sufficiently low fluctuation in peel strength when heat sealed to a thermoplastic resin carrier tape. Therefore, the tape will not tear even under shock caused by high-speed peeling, and sticking of electronic parts does not occur even when set aside for a long period of time of 24 to 72 hours in a high-temperature environment of 60 to 80° C.
摘要:
Disclosed is a cover film, which includes at least a base layer, an intermediate layer, a releasing layer and a heat seal layer that can be heat-sealed to a carrier tape, and wherein the heat seal layer contains, as a main component, a styrene-acrylic copolymer that has a mass average molecular weight of 5000 to 20000. This cover film is suppressed in variation in release strength when separated from the carrier tape, and is capable of reducing problems in the mounting process of electronic components such as rupture of the cover film during the separation.
摘要:
A cover film including, at least, (A) a substrate layer, (B) an intermediate layer, (C) a release layer and (D) a heat seal layer is provided. The release layer (C) includes a resin composition which includes (a) a styrene-based resin composition and (b) an ethylene-α-olefin random copolymer, with the content of the copolymer (b) in the release layer being 20 to 50 mass %, and which has a Vicat softening temperature of 55 to 80° C., while the heat seal layer (D) includes an acrylic resin having a glass transition temperature of 55 to 80° C. By the cover film, a carrier tape of polystyrene or the like can be so heat-sealed even in a short time as to achieve sufficient peel strength. Further, the resulting heat-sealed carrier tape exhibits little variation in peel strength, so that when peeling, few components fly out of the carrier tape.
摘要:
A pneumatic tire includes: a pair of bead portions 11; bead cores 12 each having a polygonal configuration in cross section; a radial carcass 13 having respective ends thereof wound around the corresponding bead cores from the inner side to the outer side of the tire; one layer of wire chafer 14 disposed on the outer side of the radial carcass 13 with respect to the bead core 12; and a rubber chafer 16 disposed in a contact area between the bead portion 11 and a prescribed rim R, wherein, in a cross section of the tire assembled with the prescribed rim R, the angle formed by the bottom side 12a of the bead core with respect to a bead seat Ra of the prescribed rim R is set in the range of 0±2°, and a portion, on the tire outer surface side, of a spiral filament or an outermost layer filament of steel cords 15 constituting the wire chafer 14 extends at an angle in the range of 90±5° with respect to the extending direction of ply cords constituting the radial carcass 13.