PURPOSE: To improve fuel atomization over the whole driving range, by installing a suction passage projectingly over a range from a throttle valve to nearly the central part of a volumetric enlargement chamber where branch parts of a suction manifold are concentrated and opening the passage, while forming a choke at a terminal part of the opening.
CONSTITUTION: A suction manifold 1 for four cylinders in a single suction system has each of symmetrical suction passages 1a and 1b, while both these passages 1a and 1b are concentrated at a volumetric enlargement chamber 1c. A throttle body 4 carrying a throttle valve 5 is interconnected to this volumetric enlargement chamber 1c via an insulator 6. At the same time, an umbrella part 3 partitioning a suction passage 1d ranging from the side of the throttle body 4 to nearly the central part of the chamber 1c is projectingly installed in the chamber 1c. And, at the tip end side of this umbrella part 3, a tapered choke 2 is installed, and its tip end 3a is formed into a sharp edge. A choking quantity of this choke is set down to, for example, about 30% of the passage area of a throttle bore D whereby an output drop in time of being fully opened is prevented.
SUZUKI KATSUMI
TAKEDA KEISOU
OGATA MASAMI
TOYOTA MOTOR CO LTD
| JPS5215728A | 1977-02-05 | |||
| JP56147354B | ||||
| JPS5749545B2 | 1982-10-22 | |||
| JP56097551B |
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