Toyota Boshoku Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Oyota Jidosha Kabushiki Kaisha

Takahiro Yamazaki

Kazuya Yoshijima

Yoshiaki Sumiya

Hirotsugu Kojima

Kunihiro Yamaura

Hiroshi Koyama

A composite member, which is formed by integrating an OCV housingand a cylinder head cover, is fixed to a cam capby a bolt. The boltis passed through a bolt insertion holeof the composite memberand fastened to the cam cap. A step portionis formed in a shankbetween a headand a threaded rodof the bolt. A circumferential grooveis formed in the shankbetween the step portionand the headof the bolt. The circumferential grooveextends along the outer circumferential surface of the shank. An annular sealing memberis fitted in the groove. The threaded rodof the boltis then screwed into the internal threadof the cam cap, which is a coupled member. At this time, the step portionof the boltcontacts a contacting portionin the bolt insertion holeof the OCV housing. Also, the sealing membercontacts the inner circumferential surface of the bolt insertion holeof the cylinder head cover

Composite member fixing structure

A cylinder head cover is formed by a synthetic resin outer shell, which is molded by inserting a metal valve case, which holds a oil control valve, in a mold. The valve case has a bolt fastening portion for fastening the valve case, together with the outer shell, to the cam cap. The valve fastening portion has a bolt insertion hole. The bolt fastening portion also has a flange that extends radially outward. The flange has through holes. The flange is embedded in the outer shell, and synthetic resin forming the outer shell fills the through holes.

Cylinder head cover

A tubular valve casing formed of metal is molded with an outer shell portion formed of synthetic resin. A valve body is inserted into the valve casing through an opening formed at an end of the valve casing and incorporated in the valve casing. An annular projection is formed in the outer shell portion and projects toward the end surface of the valve casing corresponding to the opening. A seal ring is arranged between the projection and the valve body.

A valve case, which is a metal component, and an outer shell portion of a cylinder head cover, which is a resin component, are joined together through a seal material. First, a recess formed in the valve case is filled with a seal material in a liquid form. A skin layer is then formed by curing the surface of the seal material. Subsequently, the outer shell portion is formed by supplying a synthetic resin material onto the valve case in such a manner as to cover the skin layer, which is provided on the surface of a non-cured portion of the seal material. At this stage, the skin layer is broken by supply pressure of the synthetic resin material and thus the synthetic resin material and the non-cured portion of the seal material are joined together as an integral body.

Growing community of inventors

Okazaki, Japan

Takahiro Yamazaki