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US3659564A Expired / Lapsed US ⏱️ 0.0 years remaining

Internal combustion engine with sub-combustion chamber

Assignee: Toyota Central R&D Labs Inc
•
Filing: 1970-03-20
•
Granted: 1972-05-02
•
Expires: 1990-03-20
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Abstract

Abstract An internal combustion engine having a cylinder, including a main combustion chamber, in combination with a sub-combustion chamber provided with an ignition plug and communicating with the main combustion chamber through a small hole in a cylinder wall for jetting out the flame of air-fuel mixture ignited in the subcombustion chamber to the main combustion chamber, the air-fuel mixture being supplied to the sub-combustion chamber through a suction tube from the same carburetor which feeds the main combustion chamber. The carburetor inlet of said suction tube is positioned upstream of a throttle valve and downstream of a venturi portion of the carburetor. A valve is placed at the outlet of the suction tube to the sub-combustion chamber and this valve may be interconnected with a main valve in the suction manifold leading from the carburetor to the main combustion chamber to move in synchronism therewith and with a piston in the cylinder, or it may be arranged to operate automatically in response to the difference of pressure within the sub-combustion chamber and the suction tube.

Inventors

  • 👤 Toshio Suzuki
  • 👤 Yujiro Oshima
  • 👤 Masao Kataoka

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 11:56
CPC Classifications
F; F02; F02B; F02B19/00; F02B19/10; F02B19/1019; F02B19/1023; F02B19/1028; F02M; F02M13/00; F02M13/02; F02M13/04; F02M13/046; F02M31/00; F02M31/02; F02M31/04; F02M31/06; F02M31/08; F02M31/087; F02M31/093; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 201 words
An internal combustion engine having, in combination, a main combustion chamber in a cylinder communicating with a manifold, a sub-combustion chamber separated from said cylinder by a wall, said sub-combustion chamber communicating with said main combustion chamber by at least one small opening in said wall and having an ignition plug for igniting fuel-air mixture therein, a carburetor connected to said cylinder by the manifold for feeding fuel-air mixture thereto and having a main nozzle including a venturi portion for supplying fuel from the fuel source, and a tube for passage of fuel-air mixture connecting said carburetor to said sub-combustion chamber, said carburetor being provided with a throttle valve positioned downstream of said main nozzle, said tube having one open end projecting into said carburetor at a position between said throttle valve and said main nozzle and the other end having an outlet to the sub-combustion chamber, the open end of said tube being directed upstream and positioned just behind the venturi portion and below an end of said main nozzle, said tube having a venturi restriction therein and a fuel passage, one end of which is connected to a fuel chamber, opening at the other end into said venturi restriction.
Claim 2
Dependent Claim 201 words
An internal combustion engine having, in combination, a main combustion chamber in a cylinder communicating with a manifold, a sub-combustion chamber separated from said cylinder by a wall, said sub-combustion chamber communicating with said main combustion chamber by at least one small opening in said wall and having an ignition plug for igniting fuel-air mixture therein, a carburetor connected to said cylinder by the manifold for feeding fuel-air mixture thereto and having a main nozzle including a venturi portion for supplying fuel from the fuel source, and a tube for passage of fuel-air mixture connecting said carburetor to said sub-combustion chamber, said carburetor being provided with a throttle valve positioned downstream of said main nozzle, said tube having one open end projecting into said carburetor at a position between said throttle valve and said main nozzle and the other end having an outlet to the sub-combustion chamber, the open end of said tube being directed upstream and positioned just behind the venturi portion and below an end of said main nozzle, said tube having a venturi restriction therein and a fuel passage, one end of which is connected to a fuel chamber, opening at the other end into said venturi restriction.
Claim 3
Dependent Claim 48 words
An internal combustion engine according to claim 1, wherein said fuel passage is a pipe, said one end connected to the fuel chamber being connected thereto by a fuel duct through a restricted portion therein, said fuel duct being provided between said fuel chamber and said main nozzle.

References Cited (Backward Citations)

FR800872A Cited
US2156665A Cited
US2690741A Cited
US3066661A Cited
US3364911A Cited
US3363611A Cited
US3444848A Cited
US3371914A Cited
US3554174A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-05-02 1975-11-01 1976-05-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-05-02 1979-11-01 1980-05-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-05-02 1983-11-01 1984-05-02 $7700.00 Window Closed / Lapsed

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