Abstract: A problem of the present invention is to prevent a magnetic property from degrading and suppress eddy currents efficiently. A motor permanent-magnet (1) according to the present invention includes a coating film (12) near a surface where an eddy current tends to flow in a great magnitude. The eddy current is cut off by an electrical nonconductive a matrix (13) intervening between magnetic phases (14) as well as small dispersed eddy currents flow in respective magnetic phases (14). In this motor permanent-magnet (1), the coating film (12) suppresses the eddy currents, which originally become great in magnitude near the surface, to make the eddy current small.

Abstract: There is provided a rare-earth permanent magnet optimized to an IPM type motor for a car, capable of improving corrosion resistance, abrasion resistance, and impact resistance. The rare-earth permanent magnet 16 is configured by forming an electroplated Ni coating film 21, of which thickness is 15 ?m or more and 30 ?m or less and of which shape is a columnar crystal structure, on a surface of a R—Fe—B system permanent magnet (R is a rare-earth element) 22. The electroplated Ni coating film 21 has a high hardness region, where the Vickers hardness is 300 or more and 600 or less, and a low hardness region, where the Vickers hardness is 150 or more and 300 or less. The rare-earth permanent magnet 16 is used in a state where the rare-earth permanent magnet 16 is inserted into a slot of a yoke in a rotor of an IPM type motor for a car.

Abstract: [Problem] To provide a process for producing a permanent magnet for use in an automotive IPM motor, which excels in all of corrosion resistance, abrasion resistance, and impact resistance. [Means for Resolution] The production process characterized in that it comprises forming on the surface of an R—Fe—B based permanent magnet a 3 to 15 ?m thick Ni film as a first layer by electroplating method, followed by a 3 to 15 ?m thick Cu or Sn film as a second layer by electroplating method, and a 4 to 7 ?m thick Ni—P alloy film as a third layer by electroless plating method, provided that the third layer has a Vicker's hardness of 2.5 to 4.5 with respect to the Vicker's hardness of the Cu or Sn electroplated film provided as the second layer taken as 1.

Abstract: A permanent magnet type rotor comprises an inner member 2 having an outer ring portion 21; an approximately annular outer member 1 having soft magnetism and an inner circumference contacting with an outer circumference of the outer ring portion; and plural permanent magnets 3 disposed at equal intervals on the outer circumference of the outer member toward the circumferential direction. At least one of the inner member 2 and the outer member 1 is made from a sintered material, and the inner member 2 and the outer member 1 are mutually sintered and bonded. Thickness and weight of a dynamotor itself can be reduced and high output and high efficiency can be achieved.

Abstract: A permanent magnet type rotor comprises an inner member 2 having an outer ring portion 21; an approximately annular outer member 1 having soft magnetism and an inner circumference contacting with an outer circumference of the outer ring portion; and plural permanent magnets 3 disposed at equal intervals on the outer circumference of the outer member toward the circumferential direction. At least one of the inner member 2 and the outer member 1 is made from a sintered material, and the inner member 2 and the outer member 1 are mutually sintered and bonded. Thickness and weight of a dynamotor itself can be reduced and high output and high efficiency can be achieved.

Abstract: A valve operating system for an internal combustion engine has an engine valve having a valve shaft portion and a valve body portion at an end tip of the valve shaft portion. The engine valve is supported on the body of the engine for opening and closing operations. A double cylindrical piston forms an air pressure chamber, with the air pressure biasing the valve in a valve closing direction. A driving member for driving the engine valve in a valve opening direction is operatively connected to the rear end of the valve shaft portion.

Abstract: A valve operating device for the intake or exhaust valves of an internal combustion engine wherein a plurality of cam followers are disposed adjacent to each other for operation by different cams in mutually different modes dependent on the speed of rotation of a camshaft. A selective coupling mechanism disposed in and between the cam followers has switching pins movable between a connecting position in which the cam followers are interconnected and a disconnecting position in which the cam followers are disconnected. An oil passage is provided in one or more of the cam followers and the switching pin therein is arranged to control the rate of flow of oil through the oil passage defined in that cam follower in response to movement of the switching pin between the connecting and disconnecting positions. The oil supplied through the oil passage is used for lubricating the cam and cam following sliding surfaces in one embodiment and for operating hydraulic valve lash adjusters in another embodiment.