Denso Corporation

Toyota Jidosha Kabushiki Kaisha

Eiji Mimura

Tsuyoshi Arai

Shinobu Oikawa

Eiji Murase

Shinsuke Yamamoto

Eiji Itoh

Atsuya Okamoto

Masaaki Konishi

Hideo Kiuchi

Isao Makino

Hisashi Kayano

Akira Kamada

Keisuke Komori

Kiyotaka Yoshimaru

An inside projection is formed in one piece with a second tubular member and projects in a tubular form toward a third tubular member, and an outside projection is formed in one piece with the third tubular member and projects in a tubular form toward the second tubular member, while an inner wall of the outside projection is engaged with an outer wall of the inside projection. Another inside projection is formed in one piece with the second tubular member and projects in a tubular form toward a first tubular member, and another outside projection is formed in one piece with the first tubular member and projects in a tubular form toward the second tubular member, while an inner wall of the outside projection is engaged with an outer wall of the inside projection.

Fuel injection device

A fuel injection valve includes a housing having a nozzle hole, a valve seat, and a fuel passage; a needle that is accommodated in the housing to be capable of reciprocating in an axial direction of the housing and that opens or closes the nozzle hole; a coil; a fixed core; a movable core; a shift permitting member that is provided between the housing and an internal-combustion engine to permit a shift of an attachment position at time of attachment of the housing and the engine; and a friction reducing part that is provided between the engine and the shift permitting member to reduce friction between the engine and the shift permitting member. The friction reducing part permits displacement of the housing in a direction perpendicular to the axial direction of the housing.

Fuel injection valve

A needle has a large-diameter portion, an outer diameter of which is larger than that of a shaft portion of the needle. A needle-side tapered surface is formed at the large-diameter portion on a valve closing side thereof, wherein the needle-side tapered surface is inclined by a needle angle with respect to a center axis of the needle. A core-side tapered surface is formed at a movable core, wherein the core-side tapered surface is inclined by a core angle with respect to the center axis of the needle. The needle and the movable core are brought into contact with each other via the needle-side and the core-side tapered surfaces. The needle angle and the core angle are made to be equal to each other.

A fuel injection valve includes, in part, a pipe, a fixed connector (fixed core), a movable core, a solenoid coil and a needle valve. In the fuel injection valve, a diameter of a fixed action surface of the fixed connector is made smaller than a movable action surface of the movable core. Therefore, magnetic flux around an outer circumferential portion is transmitted from the fixed action surface to the movable action surface substantially in a direction perpendicular to the movable action surface. Thus, an electromagnetic force acting therebetween is efficiently transformed to an attracting force for the movable core.

A first compact ( ) is molded by injection according to the MIM method in which a molding material composed of a mixture of metal powder and a binder is injected into a die for molding, after which a second compact ( ) is molded by injection in close contact with the joining surface ( ) of the first compact ( ) thereby to fabricate a metal composite compact ( ). The second compact ( ) is molded by injection by making it flow and fill a die ( ) in such a manner as to obtain a flow component (R) in the direction parallel to the joining surface ( ) of the first compact ( ) on the same joining surface ( ). In a method according to another embodiment, cavity surfaces ( ) formed on a reference die ( ) and a first replacement die ( ), respectively, are placed in opposed relation to each other thereby to form a first cavity ( ), in which the first compact ( ) is molded by injection. Then, while leaving the first compact ( ) in the cavity surface ( ) of the reference die ( ), only the first replacement die ( ) is replaced by a second replacement die ( ) having a cavity surface ( ) of a different shape thereby to form a second cavity ( ), into which the second compact ( ) is molded by injection.

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Okazaki, Japan

Eiji Mimura