Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Koyo Seiko Company, Ltd.

Hirokazu Komai

Kenji Takahashi

Kazuo Uchida

Shuji Nagano

Takao Ichimura

Takashi Fujimoto

Katsunori Ueda

Nobuaki Murakami

Takashi Kawabe

Satoshi Yoshikawa

Takeshi Hasegawa

Kazuhiro Geshi

An engine cylinder liner construction in which a cylinder liner that is cast into a cylinder block has a tubular portion and a number of spines integrally formed on an outer surface of the tubular portion, the engine cylinder liner construction includes a chamfered portion formed at an end portion m of the tubular portion which faces a cylinder head by chamfering the end portion together with the spines located thereat in a tapered fashion.

Engine cylinder liner construction

A cylinder head for an in-cylinder injection spark-ignition type internal combustion engine is formed with an injection passage for providing communication between a fuel injection valve and a combustion chamber. The injection passage includes a first and second passage sections disposed on the fuel injection valve side and on the combustion chamber side. The first passage section is formed, for example, into a truncated cone shape or a right circular cylindrical shape so that the cross sectional area decreases toward the fuel injection valve side or the area is constant over its entire length. The second passage section is formed to have the cross sectional area which increases toward the combustion chamber side. The fuel injected from the fuel injection valve flows into the combustion chamber via the injection passage having a gradually increasing cross sectional area, so that turbulence of fuel spray due to sudden divergent flow does not occur, resulting in an improved fuel combustion efficiency. Also, a seal seating face is formed on the inner face of the first passage section. By using a seal jig having a shape complementary to the seal seating face, a pressure leak test of cylinder head and a fuel leak test of fuel system can be achieved reliably and easily.

Cylinder head for an in-cylinder injection spark-ignition type internal

A rocker arm with a roller made with a metal plate and utilized in a valve actuating System of an engine is provided. The roller mounting rocker arm includes a rocker arm body (11) having a pair of side walls (11c) and a connecting portion 12 for connecting the side walls (11c), a roller (7) mounted between the side walls (11c), a pivot engageable recess (12a) formed on the connecting portion by drawing, and a valve stem receiving portion (14) formed at the other end of the side walls (11c). This roller mounting rocker arm has a high rigidity and is suitable for mass-production, and low cost is realized.

Method for manufacturing a rocker arm with a roller

A rocker arm with a roller made with a metal plate and utilized in a valve actuating system of an engine is provided. The roller mounting rocker arm includes a rocker arm body (11) having a pair of side walls (11c) and a connecting portion 12 for connecting the side walls (11c), a roller (7) mounted between the side walls (11c), a pivot engageable recess (12a) formed on the connecting portion by drawing, and a valve stem receiving portion (14) formed at the other end of the side walls (11c). This roller mounting rocker arm has a high rigidity and is suitable for mass-production, and low cost is realized.

Rocker arm with roller and a method for manufacturing the same

Growing community of inventors

Kyoto, Japan

Hirokazu Komai