Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Hideki Miyamoto

Shinichi Murata

Hirofumi Higashi

Noriyuki Miyamura

Tetsuo Kataoka

Setsuo Nishihara

Michiyasu Yoshida

Masahiko Kubo

Katsuhiko Miyamoto

Nobuaki Murakami

Noboru Nakamura

Yu Yokoyama

Takeshi Hasegawa

Yoshiyuki Hoshiba

Kiyotaka Hosono

Tomoharu Sakai

Hiroshi Kamada

Takafumi Shigemori

Toshiaki Umemura

There is provided a combustion chamber structure in an internal combustion engine in which, at a peripheral portion of a combustion chamber, a gap between a cylinder head lower face and a piston upper face is small in intake-to-intake and exhaust-to-exhaust zones and gradually increases toward an intake-to-exhaust zone. According to such design, the mixture in the peripheral portion of the combustion chamber can smoothly flow from the intake-to-intake and exhaust-to-exhaust zones to the intake-to-exhaust zone along the peripheral face of the cylinder. The flow of air-fuel mixture from the intake-to-intake zone collides at the center of the intake-to-exhaust zone with the flow of mixture from the exhaust-to-exhaust zone, and the combined flow goes over a conical tapered portion in the upper face of the piston and vigorously enters a central recessed portion thereof. Therefore, it is possible to satisfactorily mix an air-fuel mixture with a simplified configuration.

Combustion chamber structure in an internal combustion engine

In a valve-moving apparatus for an internal combustion engine, lever members are integrally formed with rocker shaft parts and arm parts, the lever members are provided with large-diameter parts larger in diameter than support parts, disposed between support parts of the rocker shaft parts supported by support members of the engine and the arm parts; rocker arms driven by cams are rotatably supported on the large-diameter parts; and change-over mechanisms for selectively engaging the large-diameter parts and the rocker arms are disposed in the large-diameter parts, thereby improving rigidity of the large-diameter parts and achieving improved reliability of the change-over mechanisms.

Valve-moving apparatus for internal combustion engine

An internal combustion engine of the present invention comprises at least first and second cylinder banks each including a plurality of cylinders or a single cylinder, a first valve operating mechanism provided for each of the cylinders of the first cylinder bank for operating an intake valve or an exhaust valve of the cylinder to open and close, and a second valve operating mechanism having a valve operating characteristic different from that of the first valve operating mechanism and provided for each of the cylinders of the second cylinder bank for operating an intake valve or an exhaust valve of the cylinder to open and close.

Internal combustion engine for vehicle

In a valve-moving apparatus for an internal combustion engine, cam shafts having a low-speed cam and a high-speed cam and rocker shaft parts are provided; arm parts 33 having rocking ends opposing the intake valve or the exhaust valve are integrally mounted on the rocker shaft parts; a low-speed rocker arm and a high-speed rocker arm are rotatably mounted; engaging means for selectively attaching the rocker arms are disposed in the rocker shaft parts; and arm springs for endowing the rocker arms 35 with biasing forces are disposed, wherein the low-speed and high-speed arm springs are set to low-speed spring specifications to achieve interchangeability.

The cylinder head of an internal combustion engine according to the present invention comprises a head base portion and an extended head portion connected to the head base portion. The extended head portion allows to arrange a variable valve timing mechanism in the cylinder head of the present invention, together with the valve system of the engine itself. The head base portion has the same interior as that of a prior cylinder head of DOHC type and a height equal to that of an another prior cylinder head of SOHC. The DOHC and SOHC cylinder head can be processed in a common manufacturing line whereby the head base portion can be also processed in the common manufacturing line.

Cylinder head of an internal combustion engine

Growing community of inventors

Kyoto, Japan

Hideki Miyamoto