Engine intake system

Internal-combustion engines – Additional air supply

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Details

123190A, 123559, 123432, F02B 2900, F02B 3300

Patent

active

045548900

ABSTRACT:
An engine intake system including a main intake passage leading to a combustion chamber through a main intake valve, a supercharging passage leading to the combustion chamber, and a supercharging pump provided in the supercharging passage. A rotary type timing valve is located in the supercharging passage and includes a rotor having inlet ports communicating with the supercharging passage at an upstream portion of the supercharging passage and an outlet port connected with the inlet port through a valve passage formed in the rotor. The rotor is driven in synchronism with engine rotation, the outlet port being arranged so that it is cyclically communicated with the supercharging passage at a downstream portion of the supercharging passage as the rotor rotates. There is provided a passage port provided in the downstream portion of the supercharging passage for cooperation with the outlet port in the rotor, the passage port including at least two port segments which are arranged so that one of the port segments is communicated with the outlet port in the rotor earlier than the other port segment. A shut-off valve is provided in the one port segment and movable between a closed position and an open position, a valve actuator for actuating the shut-off valve for changing opening period of the timing valve in accordance with the engine speed.

REFERENCES:
patent: 1578581 (1926-03-01), Casna
patent: 3948227 (1976-04-01), Guenther
patent: 4315489 (1982-02-01), Tadokoro
patent: 4470394 (1984-09-01), Tadokoro et al.
patent: 4484556 (1984-11-01), Okimoto et al.
patent: 4498429 (1985-02-01), Satow et al.

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