Kubota Corporation

Takahito Hamasaki

Kentaro Nagai

Hideyuki Goto

Yoshinori Tanaka

Hiroki Oso

Hideyuki Koyama

Takahiro Yamazaki

Tadashi Nakano

Yoshikazu Takemoto

Manabu Miyazaki

Tomoya Akitomo

Akira Tanaka

Kumiko Sakaguchi

Hiroshi Kuwasaki

Masaya Mori

An engine with an EGR device includes an engine case, and an EGR pipe that introduces an EGR gas into an intake path. The EGR pipe is arranged to pass through an inside of the engine case. A part of the EGR pipe in the engine case is arranged to face a cooling water path in the engine case. The engine case is defined by a cylinder head. The cooling water path is arranged to surround a whole circumference of the EGR pipe.

Engine with EGR device

There is provided an engine capable of reducing oil consumption. The engine includes a cylinder head, a cylinder head cover mounted above the cylinder head, a rocker arm covered by the cylinder head cover, and a breather chamber provided inside the cylinder head cover. As a front-rear direction is defined by a longitudinal direction of the cylinder head cover, the breather chamber has a blow-by gas inlet at one side in the front-rear direction, a blow-by gas outlet at another side in the front-rear direction, and an oil discharging guide chamber at an intermediate part in the front-rear direction. The blow-by gas inlet is opened on a bottom wall of the breather chamber, and a peripheral wall of the oil discharging guide chamber is protruded downwardly from the bottom wall of the breather chamber toward between the rocker arm provided at a side of the blow-by gas outlet and the blow-by gas inlet.

Engine

There is provided a cylinder head cooling apparatus of an engine capable of enhancing cooling efficiency around an auxiliary combustion chamber wall. The cylinder head cooling apparatus of an engine including a cylinder head having therein an intake port, an exhaust port, an auxiliary combustion chamber, and a cooling water jacket, in which an intake port wall, an exhaust port wall, and an auxiliary combustion chamber wall are placed in the cooling water jacket, the cooling water jacket includes a cooling water inlet and a cooling water outlet, engine cooling water flowed from the cooling water inlet into the cooling water jacket flows out from the cooling water outlet through the cooling water jacket, wherein a cooling water guide wall is provided upstream of the auxiliary combustion chamber wall in a cooling water passing path of the cooling water jacket, and the upstream cooling water guide wall is formed into a shape whose width gradually widens toward a downstream side.

Cylinder head cooling apparatus of engine

A piston for an engine includes a skirt part, and a resin coating film and a recess formed on a surface of the skirt part. A plurality of the resin coating films are discretely arranged in spots on the surface of the skirt part, and a mesh-like groove is formed by the recess provided between the resin coating films. The recess formed on the skirt part between the resin coating films adjacent to each other in a piston circumference direction is set to be adjacent to another resin coating film in a piston moving direction. An end part of the resin coating film in the piston moving direction is formed in a concave shape when seen in a piston radius direction.

Piston for engine

Growing community of inventors

Sakai, Japan

Takahito Hamasaki