JPH02126034U

JPH02126034U -

Info

Publication number: JPH02126034U
Application number: JP3324189U
Authority: JP
Priority date: 1989-03-27
Filing date: 1989-03-27
Publication date: 1990-10-17

Description

[Brief explanation of drawings]

第１図は本考案の一実施例に係る内燃機関の吸
気ポートの縦断面図、第２図は第１図の―線
に沿う断面図、第３図は第２図の―線に沿う
断面図、第４図は第２図の―線に沿う断面図
、第５図は特開昭５５−１０９７２４号公報に開
示された吸気ポートおよびそのまわりの構造の断
面図（ただし符号は変えてある）、第６図は従来
形吸気ポートの断面図、第７図は第６図の―
線に沿う断面図、第８図は第７図の―線に沿
う断面図、第９図は第７図の―線に沿う断面
図、である。１０……吸気ポート、１２……吸気バルブ、１
２ａ……吸気バルブ１２のステム、１２ｂ……吸
気バルブ１２の傘部、１４……バルブガイド、１
４ａ……バルブガイド１４の下端、１４ｂ……バ
ルブガイド１４の外壁円、１６……分岐壁、１６
ａ……分岐壁１６の下端、１８……バルブシート
、１８ａ……バルブシート内径円、２０……主吸
気路、２２……渦巻部、２２ａ……渦巻部２２の
上壁、２２ｂ……渦巻部２２の下壁、２２ｃ……
渦巻部２２の外壁、２２ｄ……渦巻部２２の内壁
、２４……導入部、２４ａ……導入部２４の上壁
、２４ｂ……導入部２４の下壁、２４ｃ……導入
部２４の外壁、２４ｄ……導入部２４の内壁、２
６……渦巻部２２と副吸気路３０との外壁交わり
部、２８……渦巻部２２と最終端部、３０……副
吸気路、３０ａ……副吸気路３０の上壁、３０ｂ
……副吸気路３０の下壁、３０ｃ……副吸気路３
０の外壁、３０ｄ……副吸気路３０の内壁、ＴＭ
……渦巻部２２と最終端部２８における外壁２２
ｃの接線、ＴＳ……副吸気路３０の最終端部にお
ける外壁３０ｃの接線、Ｓ……スワール、ｍ……
微小乱流。 Fig. 1 is a longitudinal cross-sectional view of an intake port of an internal combustion engine according to an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is a cross-sectional view taken along the - line in Fig. 2. Figure 4 is a sectional view taken along the line - in Figure 2, and Figure 5 is a sectional view of the intake port and its surrounding structure disclosed in JP-A-55-109724 (however, the symbols have been changed). ), Figure 6 is a sectional view of a conventional intake port, and Figure 7 is a cross-sectional view of the conventional intake port.
FIG. 8 is a sectional view taken along line ``-'' in FIG. 7, and FIG. 9 is a sectional view taken along line ``-'' in FIG. 7. 10...Intake port, 12...Intake valve, 1
2a... Stem of intake valve 12, 12b... Cap portion of intake valve 12, 14... Valve guide, 1
4a... Lower end of the valve guide 14, 14b... Outer wall circle of the valve guide 14, 16... Branch wall, 16
a... Lower end of branch wall 16, 18... Valve seat, 18a... Valve seat inner diameter circle, 20... Main intake path, 22... Spiral part, 22a... Upper wall of swirl part 22, 22b... Spiral Lower wall of section 22, 22c...
Outer wall of the spiral part 22, 22d...Inner wall of the spiral part 22, 24...Introduction part, 24a...Upper wall of the introduction part 24, 24b...Lower wall of the introduction part 24, 24c...Outer wall of the introduction part 24, 24d...Inner wall of introduction part 24, 2
6... External wall intersection of the spiral portion 22 and the sub-intake passage 30, 28... The swirl portion 22 and the final end, 30... Sub-intake passage, 30a... Upper wall of the sub-intake passage 30, 30b
... lower wall of sub-intake passage 30, 30c... sub-intake passage 3
0 outer wall, 30d...inner wall of sub-intake passage 30, TM
...The outer wall 22 at the spiral portion 22 and the final end portion 28
tangent to c, TS... tangent to outer wall 30c at the final end of sub-intake passage 30, S... swirl, m...
Microturbulence.

Claims

[Claims for Utility Model Registration] A main air intake passage having a spiral spiral part and an introduction part extending in a substantially straight line; branching from the main intake passage in the middle of the introduction part and communicating with the terminal end of the spiral part. In an intake port of an internal combustion engine consisting of an auxiliary intake passage extending approximately linearly; An intake port for an internal combustion engine, characterized in that the upper wall of the sub-intake passage intersects with the auxiliary intake passage, and the upper wall of the sub-intake passage is steeper than the slope of the upper wall of the spiral portion and smoothly descends to the downstream side.