Patent ID: 6695896
Filing Date: 2004-02-24
Classification: B01D,F02M

Abstract:
An evaporated fuel treatment apparatus for introducing an evaporated fuel generated in a fuel tank of an internal combustion engine to discharge the evaporated fuel to an intake passage, and emitting the evaporated fuel to the atmosphere after adsorbing fuel components contained in the evaporated fuel, said apparatus comprising:a main chamber and a sub-chamber, wherein the main chamber is in communication with said fuel tank, and the sub-chamber is in communication with said main chamber and the atmosphere, respectively; a main adsorbent contained in said main chamber for adsorbing fuel components in an evaporated fuel introduced from said fuel tank; and a sub-adsorbent contained in said sub-chamber for adsorbing fuel components in the evaporated fuel introduced from said main chamber before said evaporated fuel is emitted from said sub-chamber to the atmosphere, wherein said sub-chamber including said sub-adsorbent has an air-flow resistance which is smaller than an air-flow resistance of said main chamber including said main adsorbent, and wherein said sub-adsorbent is formed in a honeycomb shape formed by a large number of partition walls, and each of said partition walls comprises two spaced apart sheets each having an air permeability, and a large number of granular adsorbents sandwiched between said two sheets.