IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0392904
(2006-03-30)
|
등록번호 |
US-7331322
(2008-02-19)
|
우선권정보 |
JP-2005-102498(2005-03-31) |
발명자
/ 주소 |
- Seki,Yoshitaka
- Nakagome,Hiroshi
- Nagashii,Toshihisa
- Akaoka,Hitoshi
- Hariu,Jun
|
출원인 / 주소 |
|
대리인 / 주소 |
Birch, Stewart, Kolasch & Birch, LLP
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
4 |
초록
▼
An intake duct structure having an intake path extending forwardly from a cleaner box, penetrating through an area near a head pipe of a vehicle body frame, and opening at a front end portion of a front cowl. During low speed operation of the engine, an intake valve closes a main intake path MR from
An intake duct structure having an intake path extending forwardly from a cleaner box, penetrating through an area near a head pipe of a vehicle body frame, and opening at a front end portion of a front cowl. During low speed operation of the engine, an intake valve closes a main intake path MR from a front end intake port and opens a sub-intake path SR from a lower portion intake port. On the other hand, during high speed operation of the engine, the intake valve opens the main intake path MR and closes the sub-intake path SR. The lower portion intake port opens forward of a head pipe inside a front cowl and obliquely downwardly toward the rear. With this arrangement, entry of rainwater into the intake path can be minimized during low speed operation of the engine.
대표청구항
▼
What is claimed is: 1. An intake duct structure, comprising: an intake duct extending forwardly from an air cleaner box to penetrate through an area near a head pipe of a vehicle body frame and opening at a front end portion of a front cowl; a main intake port opening toward a front of a vehicle at
What is claimed is: 1. An intake duct structure, comprising: an intake duct extending forwardly from an air cleaner box to penetrate through an area near a head pipe of a vehicle body frame and opening at a front end portion of a front cowl; a main intake port opening toward a front of a vehicle at the front end portion of the front cowl; and a valve selecting either a main intake path from the main intake port or a sub-intake path from a sub-intake port, the valve closing the main intake path and opening the sub-intake path during a low speed operation of an engine, and the valve opening the main intake path and closing the sub-intake path during a high speed operation of the engine, wherein the sub-intake port opens forward of the head pipe inside the front cowl and in a direction different from the main intake port. 2. The intake duct structure according to claim 1, wherein driving of the valve is accomplished by a diaphragm operated using an engine intake negative pressure. 3. The intake duct structure according to claim 2, wherein the sub-intake port opens in a space covered by the front cowl on both sides and in a lower surface of the main intake path such that an axis is inclined so as to be oriented rearwardly. 4. The intake duct structure according to claim 2, further comprising a suction piston connected to the diaphragm, and during the low speed operation of the engine, the suction piston ascends to pull the intake valve up to the flow path fully closed position, whereas during high speed operation of the engine, the suction piston descends to push the intake valve down to the flow path fully open position. 5. The intake duct structure according to claim 1, wherein the sub-intake port opens in a space covered by the front cowl on both sides and in a lower surface of the main intake path such that an axis is inclined so as to be oriented rearwardly. 6. The intake duct structure according to claim 1, wherein the valve directly closes the sub-intake port disposed in a wall surface of the main intake path. 7. The intake duct structure according to claim 1, wherein the intake duct includes an in-cowl duct, an in-frame duct, and a box-side duct, thus forming the main intake path that penetrates through a front end portion of the vehicle body frame from a front end portion of the front cowl to the air cleaner box. 8. The intake duct structure according to claim 1, wherein a portion of the intake duct forward of the head pipe slopes downward toward to main intake port, and a portion of the intake duct rearward of the head pipe slopes downward toward the fair cleaner box. 9. The intake duct structure according to claim 1, wherein the intake duct branches into both sides of the head pipe. 10. The intake duct structure according to claim 1, further comprising a duct cover formed integrally with an outer side at a front end of the vehicle body frame, the duct cover including an intake port immediately forward of head pipe. 11. An intake duct structure, comprising: an intake duct extending forwardly from an air cleaner box to penetrate through an area near a head pipe of a vehicle body frame and opening at a front end portion of a front cowl; a main intake port opening toward a front of a vehicle at the front end portion of the front cowl; and a valve selecting either a main intake path from the main intake port or a sub-intake path from a sub-intake port, the valve closing the main intake path and opening the sub-intake path during a low speed operation of an engine, and the valve opening the main intake path and closing the sub-intake path during a high speed operation of the engine, wherein the sub-intake port opens forward of the head pipe inside the front cowl and in a direction substantially perpendicular to the main intake port. 12. The intake duct structure according to claim 11, wherein driving of the valve is accomplished by a diaphragm operated using an engine intake negative pressure. 13. The intake duct structure according to claim 12, wherein the sub-intake port opens in a space covered by the front cowl on both sides and in a lower surface of the main intake path such that an axis is inclined so as to be oriented rearwardly. 14. The intake duct structure according to claim 12, further comprising a suction piston connected to the diaphragm, and during the low speed operation of the engine, the suction piston ascends to pull the intake valve up to the flow path fully closed position, whereas during high speed operation of the engine, the suction piston descends to push the intake valve down to the flow path fully open position. 15. The intake duct structure according to claim 11, wherein the sub-intake port opens in a space covered by the front cowl on both sides and in a lower surface of the main intake path such that an axis is inclined so as to be oriented rearwardly. 16. The intake duct structure according to claim 11, wherein the valve directly closes the sub-intake port disposed in a wall surface of the main intake path. 17. The intake duct structure according to claim 11, wherein the intake duct includes an in-cowl duct, an in-frame duct, and a box-side duct, thus forming the main intake path that penetrates through a front end portion of the vehicle body frame from a front end portion of the front cowl to the air cleaner box. 18. The intake duct structure according to claim 11, wherein a portion of the intake duct forward of the head pipe slopes downward toward to main intake port, and a portion of the intake duct rearward of the head pipe slopes downward toward the air cleaner box. 19. The intake duct structure according to claim 11, wherein the intake duct branches into both sides of the head pipe. 20. The intake duct structure according to claim 11, further comprising a duct cover formed integrally with an outer side at a front end of the vehicle body frame, the duct cover including an intake port immediately forward of head pipe.
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