Claims
- 1. An intake air duct serving as a passage for supplying air to an engine, the intake air duct comprising:a first intake air passage; a second intake air passage; an opening-and-closing valve swingably disposed in said second intake air passage so as to open and close said second intake air passage; an interlocking member swingably disposed outside said first intake air passage and said second intake air passage such that swinging of the opening-and-closing valve results in the swinging of the interlocking member; and a coiled spring disposed swingably outside said first intake air passage and said second intake air passage, and having a swinging end brought into contact with a surface of said interlocking member, the swinging end sliding on a surface of said interlocking member during the swinging of said interlocking member; said second intake air passage being opened by said opening-and-closing valve when a first urging force, which acts onto said coiled spring, is larger than a second urging force, which is exerted by a spring elasticity of said coiled spring, and being closed when the first urging force is smaller than the second urging force, and/said first urging force results from a negative pressure exerted in said second intake air passage applied to the opening-and-closing valve causing said opening-and-closing valve swinging in the opening direction, and further causing the swinging of the interlocking member.
- 2. The intake air duct according to claim 1, wherein said coiled spring has a wire end opposite the swinging end, the wire end extending inwardly within the coiled spring, the wire end being secured outside the second air intake passage.
- 3. The intake air duct according to claim 1, wherein at least one of a leading end, of said coiled spring surface of said interlocking member, on which said coiled spring slides, has a sliding member, which exhibits a small friction resistance.
- 4. The intake duct according to claim 1, further comprising a cover which covers said interlocking member and said coiled spring.
- 5. The intake air duct according to claim 1, wherein said interlocking member has a guide groove which guides said coiled spring swinging end.
- 6. The air intake duct according to claim 5, wherein said coiled spring has a sliding member having a substantially semi-spherical shape, and said guide groove has a second guide groove having a cross-section arcuate shape.
- 7. The intake air duct according to claim 1, wherein said opening-and-closing valve has a cushioning member which contacts with a step disposed in said second intake air passage.
Priority Claims (8)
Number |
Date |
Country |
Kind |
10-106740 |
Apr 1998 |
JP |
|
10-153139 |
Jun 1998 |
JP |
|
10-321714 |
Nov 1998 |
JP |
|
10-321746 |
Nov 1998 |
JP |
|
10-321748 |
Nov 1998 |
JP |
|
11-68573 |
Mar 1999 |
JP |
|
11-222530 |
Aug 1999 |
JP |
|
12-32968 |
Feb 2000 |
JP |
|
Parent Case Info
This is a continuation-in-part of application Ser. No. 09/293,148, filed on Apr. 16, 1999.
US Referenced Citations (8)
Foreign Referenced Citations (2)
Number |
Date |
Country |
64-22866 |
Jul 1987 |
JP |
3-43576 |
Sep 1989 |
JP |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09/293148 |
Apr 1999 |
US |
Child |
09/633068 |
|
US |