Exhaust gas cleaning system for multi-cylinder internal combustion engines
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsYasuo Ikenoya, Makoto Hirano, Masafumi Araki
Life of this patent
Estimating the term…
Abstract
An improved exhaust gas cleaning system for a multi-cylinder internal combustion engine having an exhaust system with exhaust ports opening into a plurality of combustion chambers. A secondary air supplying system is in communication with the exhaust system for supplying secondary air to the exhaust system. A plurality of reed valve devices are interposed in the secondary air supplying system and are operated to open and close in response to pulsations of exhaust gas developed in the exhaust system during engine operation for controlling supply of secondary air to the respective exhaust ports independently of each other.
Claims18
An exhaust gas cleaning system for a multi-cylinder internal combustion engine comprising a plurality of combustion chambers, an exhaust system having exhaust ports opening into respective combustion chambers, a secondary air supplying system communicating with said exhaust system for supplying secondary air to said exhaust system, and a plurality of reed valve means interposed in said secondary air supplying system and adapted to open or close in response to pulsations of exhaust gas developed in said exhaust system during engine operation for controlling supply of secondary air to said respective exhaust ports independently of each other, said secondary air supplying system including single common inlet passage means leading to the ambient atmosphere for feeding secondary air to said reed valve means and a plurality of outlet passage means connected to said exhaust ports, respectively, said reed valve means including reed valve members and upstream and downstream chambers formed at opposite sides of said reed valve members, respectively, said upstream chambers being formed independently of one another for connection to said common inlet passage means while said downstream chambers are formed independently of one another and communicate with said respective outlet passage means, and a cylinder head cover, said inlet passage means as well as at least part of said outlet passage means, said reed valve members, said upstream and downstream chambers all being in said cylinder head cover.
An exhaust gas cleaning system for a multi-cylinder internal combustion engine of the type having a cylinder block;
- a cylinder head disposed on said cylinder block;
- an intake valve and an exhaust valve mounted in said cylinder head for each cylinder;
- a valve-operating cam mechanism disposed above said intake and exhaust valves for opening and closing said intake and exhaust valves, said cam mechanism including a cam shaft, a cam element mounted on said cam shaft, and a plurality of spaced bearings in said cylinder head each having a cam shaft holder fixedly secured thereto rotatably supporting said cam shaft;
- a cylinder head cover secured to said cylinder head for covering said cam shaft and said cam shaft holders;
- and a plurality of combustion chambers;
- said exhaust gas cleaning system comprising an exhaust system having exhaust ports opening into respective combustion chambers, a secondary air supplying system communicating with said exhaust system for supplying secondary air to said exhaust system, and a plurality of reed valve means interposed in said secondary air supplying system and mounted in said cylinder head cover so as to be located in spaces between adjacent cam shaft holders, said reed valve means being adapted to open or close in response to pulsations of exhaust gas developed in said exhaust system during engine operation for controlling supply of secondary air to said respective exhaust ports independently of each other.
In a multicylinder internal combustion engine having a cylinder block, a cylinder head on said block, a cylinder head cover secured to said cylinder head, a plurality of combustion chambers, intake and exhaust valves in said cylinder head controlling fluid flow to and from the combustion chambers, and an exhaust system having exhaust ports opening into respective combustion chambers, the improvement comprising an exhaust gas cleaning system including secondary air supplying means for supplying secondary air to the exhaust system of the engine, and a plurality of reed valve means each associated with a respective combustion chamber for respectively controlling supply of secondary air to a respective exhaust port of the associated combustion chamber independently of the other exhaust ports, said secondary air supplying means having an inlet passage means which consists of first and second passages for feeding secondary air to upstream chambers of said reed valve means and a plurality of outlet passage means formed independently of each other for each connecting a downstream chamber of said reed valve means and said exhaust port, said inlet passage means, at least part of said outlet passage means, and said upstream and downstream chambers of the reed valve means all being provided in said cylinder head cover.
Dependencies are inferred from the claim text.