Canister

• US 4,173,207 A
• Filed: 03/22/1978
• Issued: 11/06/1979
• Est. Priority Date: 01/14/1976
• Status: Expired due to Term

• Current Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Hiramatsu, Eiji
• Primary Examiner(s): Myhre, Charles J.
• Assistant Examiner(s): Argenbright, Tony M.
• Application Number:
  US05/889,112
• Time in Patent Office: 594 Days
• Field of Search: 123/136, 220/85 VR, 220/85 VS, 55/387, 55/DIG. 28
• US Class Current: 123/519
• CPC Class Codes: F02M 25/0854 Details of the absorption canister

Abstract

A canister comprising:

a main body having a space therein; an adsorbent material contained in the space of said main body; an inlet pipe attached to said main body for connecting a carburetor float chamber with an upper portion of said space defined between said main body and said adsorbent material; an air suction pipe attached to said main body through which pipe the lower portion of said space defined between said canister and said adsorbent material communicates with the atmosphere; and valve means for selectively connecting said upper portion of said space with a fuel tank, thereby to prevent an evaporation gas from flowing from said fuel tank through said upper portion of said space into said carburetor float chamber.

Claims

1. A canister for an internal combustion engine having a carburetor that includes a float chamber (3) and a purge port (17) positioned adjacent a throttle valve (5) and a fuel tank (12), said canister comprising:

a hollow, main body (18) having a space therein;

an adsorbent material (24) partially filling said space in said main body and defining upper and lower spaces (26 and 28, respectively) in combination with said main body;

a first inlet pipe (31) attached to said main body (18) for permitting passage of fuel evaporation gases from the float chamber (3) of the carburetor (2) to said upper space (26);

an air suction pipe (14) attached to said main body (18) whereby said lower space (28) communicates with the atmosphere through said suction pipe; and

valve means (37, 41 and

     36) separate from said first inlet pipe (31) for providing selected fluid communication between both the fuel tank (12) and said upper space as well as the purge port (17) and said upper space, said valve means comprising;

a valve casing (29) positioned in said housing and having a tubular partition (30) extending downwardly therefrom into said adsorbent material (24);

a first, positive pressure ball-type check valve (37) in said valve casing and in fluid communication with said upper space (26);

a second inlet pipe (32) fluidly connecting the fuel tank (12) to said first check valve (37) and to said upper space (26);

a second, negative pressure ball-type check valve (41) in said valve casing and in fluid communication with said upper space (26);

said second inlet pipe (32) also providing fluid communication between said second check valve (41) and the fuel tank (12), said second check valve (41) acting only when the pressure in the fuel tank (12) is negative;

a third ball-type check valve (36) in said valve casing and in fluid communication with said upper space (26);

an outlet pipe (33) fluidly coupling the purge port (17) and said third check valve (36) for preventing the fuel evaporation gas from flowing back from the carburetor (2) into said upper space (26).