IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0437848
(2003-05-14)
|
우선권정보 |
JP-0140438 (2002-05-15) |
발명자
/ 주소 |
- Tanaka, Tsuneo
- Minato, Akihiko
- Arakawa, Yoshihiro
|
출원인 / 주소 |
|
대리인 / 주소 |
McCormick, Paulding & Huber LLP
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
1 |
초록
▼
A valve driving device reduces the volume of the pressure chamber and decreases the energy supplied during driving to open the main valve. As a result of this initial energy, the main valve is lifted by inertial motion. When the main valve is opened (lifted), a first actuating valve is opened, and h
A valve driving device reduces the volume of the pressure chamber and decreases the energy supplied during driving to open the main valve. As a result of this initial energy, the main valve is lifted by inertial motion. When the main valve is opened (lifted), a first actuating valve is opened, and high-pressure actuating fluid is supplied to the pressure chamber. When in this process the pressure in the pressure chamber falls below the pressure of a low-pressure chamber, a second actuating valve opens independently, and low-pressure actuating fluid is introduced into the pressure chamber. By this means negative pressure in the pressure chamber can be prevented, and the main valve can be held in a lift position equivalent to the initial energy. When the main valve is to be closed, an actuator forcibly opens the second actuating valve. Then, high-pressure actuating fluid in the pressure chamber passes through the second actuating valve, presses and opens a third actuating valve on the downstream side, and is discharged to a path.
대표청구항
▼
1. A valve driving device of an internal combustion engine, to drive the opening and closing of a main valve serving as an intake valve or an exhaust valve of said internal combustion engine, comprising: a pressure chamber, to which is supplied pressurized actuating fluid in order to open said mai
1. A valve driving device of an internal combustion engine, to drive the opening and closing of a main valve serving as an intake valve or an exhaust valve of said internal combustion engine, comprising: a pressure chamber, to which is supplied pressurized actuating fluid in order to open said main valve; a high-pressure actuating fluid supply source, connected to said pressure chamber; a low-pressure actuating fluid supply source, connected to said pressure chamber; a first actuating valve, provided between said pressure chamber and said high-pressure actuating fluid supply source, which is opened for a prescribed period in an initial opening period of said main valve, and which supplies high-pressure actuating fluid from said high-pressure actuating fluid supply source to said pressure chamber; a second actuating valve, provided between said pressure chamber and said low-pressure actuating fluid supply source, comprising a check-valve which, after said prescribed interval in the initial opening period of said main valve has elapsed, is opened based on the pressure difference when the pressure of said pressure chamber falls below the pressure of said low-pressure actuating fluid supply source, and which introduces low-pressure actuating fluid from said low-pressure actuating fluid supply source into said pressure chamber; a third actuating valve, provided between said second actuating valve and said low-pressure actuating fluid supply source or in said low-pressure actuating fluid supply source, comprising a check-valve which is opened when an inlet-side pressure is higher than a prescribed pressure setting which is higher than the pressure of said low-pressure actuating fluid supply source and is lower than the pressure of said high-pressure actuating fluid supply source, and by which means actuating fluid of said pressure chamber is discharged; and, an actuator, which forcibly opens said second actuating valve in order to close said main valve. 2. The valve driving device of an internal combustion engine according to claim 1, wherein said third actuating valve is provided between said second actuating valve and said low-pressure actuating fluid supply source; the second actuating valve and third actuating valve are comprised by a single valve unit; and said low-pressure actuating fluid supply source is connected to said valve unit.3. The valve driving device of an internal combustion engine according to claim 1, wherein said second actuating valve comprises a valve body, moveable in the axial direction; a poppet valve portion which receives the pressure on the side of said pressure chamber and is pressed toward the closed-valve side is provided on one end of the valve body; and wherein said actuator comprises an electrical actuator which, when turned on, presses against the other end of said valve body to drive said valve body to the open-valve side.4. The valve driving device of an internal combustion engine according to claim 1, wherein a valve stopper is provided which defines the maximum opening of said second actuating valve.
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