Other

Honda Giken Kogyo Kabushiki Kaisha

Sumitomo Metals, Ltd.

Mitsuo Takashima

Seiichi Koike

Hitoshi Matsumoto

Nobuhiko Ibaraki

Shigekazu Tanaka

Toshinari Sonoda

Shigemasa Kajiwara

Yasuyuki Kimura

Masashi Murata

Kaoru Aoki

Yoshihiko Kamada

Takashi Taguchi

Masato Kurita

Shigeki Muroga

Zenji Iida

Mitsuo Uno

Masahiko Tashiro

Atsushi Iwamoto

Katsuhiro Tsukiyama

Yuichi Namimura

Material for a connecting rod for an internal combustion engine is carburized and quenched, a carburized layer formed on the bearing portion is ground until the portion which exhibits the maximum compressive residual stress, and a shot-peening processing is performed on the ground surface. The invention produces a bearing portion having surface characteristics in which maximum compressive residual stress is imparted, and therefore, remarkable improvement in the fatigue strength in the bearing portion can be obtained. Furthermore, a large number of concavities formed by the shot-peening processing can be efficiently employed as an oil reservoir, so that sliding properties and lubrication can be improved, and the occurrence of problems such as fretting corrosion, galling, and seize can also be solved, and the galling and problems of the seize can be prevented.

Production process for connecting rod for internal combustion engine

A high-strength bolt having excellent delayed fracture resistance and stress relaxation resistance in addition to a tensile strength of 1200 N/mm or higher is disclosed. A steel material for the high-strength bolt includes C: 0.50 to 1.0% by mass (hereinafter, referred to simply as &ldquo;%&rdquo;), Si: 0.5% or less (not including 0%), Mn: 0.2 to 1%, P: 0.03% or less (including 0%) and S: 0.03% or less (including 0%). The steel material has pro-eutectoid ferrite, pro-eutectoid cementite, bainite and martensite structures at less than 20% in total and a pearlite structure as the remainder. The high-strength bolt is produced by drawing the steel material severely to obtain a steel wire, forming the steel wire into a bolt shape through a cold heading, and subjecting the shaped steel wire to a blueing treatment at a temperature within a range of 100 to 400&deg; C.

Method for manufacturing high strength bolt excellent in resistance to delayed fracture and to relaxation

Non-heat treated, soft-nitrided steel parts

In an engine for a vehicle including a bearing cap integral type oil pan which has a plurality of bearing cap sections integrally provided thereon and which is integrally coupled to a cylinder block, connecting bolts are screwed into the bearing cap sections from the cylinder block to integrally couple the cylinder block and the oil pan to each other. An oil pan chamber, which is an as-cast bore made by drawing a die in an axial direction of a crankshaft, is defined to extend continuously in the axial direction of the crankshaft between the bearing cap sections and a bottom wall of the oil pan. Thus, the oil pan can be produced simply, at a low cost, by a casting process and moreover, it is possible to reduce the weight and size of the oil pan and increase the rigidity of the oil pan.

Engine for vehicle

Growing community of inventors

Wako, Japan

Mitsuo Takashima