Toyota Jidosha Kabushiki Kaisha

Aoyama Seisakusho Co., Ltd.

Tokai Trw & Co., Ltd.

Masahito Iwata

Yoshihiro Murase

Satoshi Konagaya

Sadayoshi Hasegawa

Masahito Ishihara

Seiichi Toyonaga

Satoshi Fujiura

Kouichirou Kouguchi

A female thread member capable of preventing seizing caused by inclined insertion, and being smoothly fastened from any directions in which a bolt is inserted, and a fastening member using the female thread member. A non-thread portion is formed on an inner peripheral surface of a female thread member body having a female thread for a length corresponding to at least one pitch from an end surface on a bolt-inserting side, and a projection which comes into contact with a flank surface of a male thread of an inserted bolt is formed on a line extending from a helical line of the female thread. The female thread member is used in combination with the bolt having no incomplete thread portion, and there is no adverse possibility of seizing regardless of any directions in which the bolt is inserted.

Female screw component and fastening component utilizing the same

A method for manufacturing a single-piece type valve sleeve, includes plastic-working a workpiece thereby to form in the workpiece a blind bore and a plurality of grooves in the surface of the bore and extending lengthwise of the bore, plastic-working a portion of the workpiece at the bottom of the bore so as to form a through hole in the workpiece, and plastic-working an inner portion of the workpiece adjacent the mouth of the bore thereby to close one end of the grooves. A single-piece type valve sleeve is produced by the method.

Method for manufacturing a single-piece type valve sleeve

Growing community of inventors

Seto, Japan

Masahito Iwata