Kubota Corporation

Masahiko Sugimoto

Katsushi Inoue

Masahiro Aketa

Toshio Nakahira

Shuichi Yamada

Kentaro Kita

Akihiko Kai

Kazutoshi Okamoto

Hirozumi Kuwabara

Hideo Shimoji

Hiroki Murata

Gen Nakamura

Nobuhiro Yamamoto

Masaji Yukawa

Akira Hayatani

Yasukazu Kamada

An engine promoting activation of a catalyst is provided, including an exhaust manifold, an exhaust lead-out path led out from a manifold exit of the exhaust manifold, a catalyst case provided on the exhaust lead-out path, and a catalyst housed in the catalyst case. The exhaust manifold and the catalyst case are extended in the front-back direction of crankshaft extension and disposed side by side orthogonally to the front-back direction. The engine may further include a supercharger attached to the exit of the exhaust manifold, and the catalyst case is attached to a turbine exit of the supercharger. The engine may further include an exhaust relay pipe attached to the exit of the exhaust manifold, and the catalyst case is attached to a relay pipe exit of the exhaust relay pipe. The engine may further include an exhaust throttle device provided on an exhaust downstream side of the catalyst.

Engine

The present invention has an object to provide an exhaust device for a diesel engine capable of surely burning flammable gas in an exhaust route. In the exhaust device for the diesel engine, liquid fuel () is supplied from a liquid-fuel supply source () to a gas generator (). The gas generator () converts the liquid fuel () to flammable gas () and has a flammable-gas flow outlet () of the with which an exhaust route () is communicated upstream of a diesel-particulate-filter (). The flammable gas () flowed out from the flammable-gas flow outlet () is burnt with oxygen in exhaust gas () to produce combustion heat. The exhaust gas () heated by the thus produced combustion heat can burn the exhaust-gas fine particles remaining at the filter (). The gas generator () is provided with a catalyst chamber () which houses a catalyst (). Catalyst-combustion heat is generated in the catalyst chamber () which is arranged along an external periphery of a peripheral wall () of the exhaust route ().

Exhaust device for a diesel engine

An exhaust device for a diesel engine supplies liquid fuel () from a supply source () of the liquid fuel () to a gas generator () which converts the liquid fuel () to flammable gas () and from which a flammable-gas supply passage () is conducted, the flammable-gas supply passage () having a flammable-gas outlet () communicated with an exhaust-gas route () upstream of a diesel-particulate-filter (), the flammable gas () flowed out of the flammable-gas outlet () being burnt in exhaust gas () to generate combustion heat which can burn fine particles of the exhaust gas () remaining at the filter (). In this exhaust device for a diesel engine, a case () for containing the filter () accommodates at least part of the gas generator ().

A water passage forming member (10) embedded in a connection wall (4) between adjacent bores (3a) (3a) of a multi-cylinder (2) by a casting process is provided with a pair of left and right vertical jacket communication passages (12)(12) for making cylinder jackets (8)(8) within a cylinder block (1) communicate with a head jacket (22), cooling water passages (15) arranged vertically and in multiple stage for making the paired jacket communication passages (12)(12) communicate with each other, and non-hollow portions (11) arranged in multiple stage and alternately with the cooling water passages (15). A pair of left and right cooling water induction portions (13)(13) are disposed in the lower portions of the jacket communication passages (12)(12) and opened toward the cylinder jackets (8)(8), and the paired left and right cooling water induction portions (13)(13) are constructed by spreading a pair of fore and rear cooling water guiding plates (14)(14) projected leftward and rightward, along the respective external circumferential surfaces (3a) (3a) of adjacent fore and rear cylinders (3)(3).

Cylinder cooling apparatus of multi-cylinder engine

Growing community of inventors

Sakai, Japan

Masahiko Sugimoto