Internal-combustion engines – Engine speed regulator – Specific throttle valve structure
Patent
1988-09-13
1989-08-29
Nelli,, Raymond
Internal-combustion engines
Engine speed regulator
Specific throttle valve structure
123319, F02M 908
Patent
active
048607061
ABSTRACT:
A throttle valve comprising a first outer peripheral portion linearly contacting an inner wall of an intake passage at a predetermined throttle angle and a second outer peripheral portion formed in the vicinity of a throttle shaft in such a manner as to gently continue from the first outer peripheral portion and not contacting the inner wall at the predetermined throttle angle. With this arrangement, as there is defined a space between the second outer peripheral portion and the inner wall in the vicinity of the throttle shaft, the generation of scuffing and biting of the throttle valve against the inner wall may be prevented. Further, as the first outer peripheral portion of the throttle valve linearly contacts the inner wall at the closing position, the leakage of suction air upon full closing of the throttle valve may be suppressed. Further, a drainage structure for a motor for opening and closing the throttle valve and a bearing support structure for rotatably supporting the throttle shaft with respect to a throttle housing are also disclosed.
REFERENCES:
patent: 3620195 (1971-11-01), Lamar
patent: 4344396 (1982-08-01), Yamada
patent: 4356801 (1982-11-01), Graham
patent: 4462358 (1984-07-01), Ishida et al.
patent: 4474150 (1984-10-01), Foley et al.
patent: 4480367 (1984-11-01), Johnson et al.
patent: 4519369 (1985-05-01), Kitamura
patent: 4561158 (1985-12-01), Johnson et al.
Imamura Kaneo
Suzuki Takio
Aisan Kogyo Kabushiki Kaisha
Nelli Raymond
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