Nippondenso Co., Ltd.

Nippon Soken, Inc.

Takeshi Ishii

Akira Fukami

Junzi Mizuno

Hiroki Noguchi

Kunio Okamoto

A canister to be used in the fuel supplying system of an internal combustion engine of a vehicle, is disclosed. The canister is provided with a fuel vapors guiding pipe for guiding the fuel vapors from a fuel vapors inlet port into a bed of adsorbent material accomodated within a housing, and a deflector for deflecting the flow of fuel vapors guided by the guiding pipe so as to be dispersed throughout the bed. The deflector is formed of air-permeable material having a flowing resistance slightly larger than that of the bed into a frusto-conical plate. According to the present invention, one part of the fuel vapors flowing into the bed through the guiding pipe in the fuel vapors adsorbing process flows along the upper surface of the deflector in the direction of the upper portion of the bed and another part of the fuel vapors flows through the deflector in the direction of the lower portion of the bed. Fresh air sucked into the bed in the fuel vapors purging process flows through the bed without being obstructed by the deflector so that the fuel vapors adsorbed by the whole bed are purged.

Canister for internal combustion engine

A fuel evaporative emission control apparatus comprising a vessel having an adsorbent layer therein for adsorbing a vaporized fuel, and a vaporized fuel inlet conduit inserted in the adsorbent layer, wherein the improvement comprises a flow deflector of a hollow conical shape having a diameter gradually increasing upward, the deflector being embedded in the adsorbent layer, the vertical angle (.alpha.) of the flow deflector is adjusted to 60.degree. to 120.degree., the ratio (S1/S2) of the sectional area (S1) of the largest-diameter end portion of the flow deflector to the sectional area (S2) of the adsorbent layer is adjusted to 0.4 to 0.6, the ratio (a/b) of the distance (a) between the largest-diameter end portion of the flow deflector and the top end of the adsorbent layer to the distance (b) between the largest-diameter end portion of the flow deflector and the side end of the adsorbent layer is adjusted to at least 1.5, and the distance (a) is made smaller than the sum (g+b) of said distance (b) and the axial length (g) of the conduit in the adsorbent layer.

Fuel evaporative emission control apparatus for vehicles

In a canister for a fuel evaporative emission control system of an automotive vehicle, a deflector of the conical frustum shape is embedded in the adsorbent layer of the canister. A diameter of the deflector gradually increases upwardly and a bottom of the deflector faces to the end of the inlet conduit. Dimensional relations of various parts of the deflector are specified. The deflector may include a check valve mounted on the underside of the bottom of the deflector.

Canister for fuel evaporative emission control system

A canister for a fuel evaporative emission control system of an engine; A mass of adsorbent contained in a canister casing is divided into at least two layers by a pair of spaced filter plates, so that the fuel vapors can be diffused into all parts of the adsorbent layers under the deflecting action of the filter plate and the uniforming action of a hollow space defined between the paired filter plates.

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Anjo, Japan

Takeshi Ishii