Internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTakeshi Ashizawa
Life of this patent
Estimating the term…
Abstract
An internal combustion engine is provided with an exhaust valve which has a tapered plug part, a tube-shaped member which is arranged in a region where the exhaust valve is arranged and which is engaged with the tapered plug part of the exhaust valve at one end part which faces a combustion chamber, and a fluid spring for biasing the tube-shaped member to the side facing the combustion chamber. The tube-shaped member is formed so as to be able to move substantially parallel to the direction of movement of the exhaust valve and the other part abuts against the fluid spring. The fluid spring is formed so as to contract using the change in pressure of the combustion chamber as a drive source when the pressure of the combustion chamber reaches a predetermined control pressure.
Claims8
An internal combustion engine provided with
- an on-off valve which has a shaft-shaped part and tapered plug part and is formed to be able to open and close a passage which is communicated with a combustion chamber,
- a support structure which includes a passage which communicates with the combustion chamber and which supports the on-off valve,
- an interposed member which is arranged in a region where the on-off valve is arranged in the passage which communicates with the combustion chamber and which is engaged with the tapered plug part of the on-off valve at one end part which faces the combustion chamber,
- a spring device for biasing the interposed member to the side which faces the combustion chamber,
- an operating state detecting device which detects an operating state of the internal combustion engine, and
- a movement restricting device which restricts an amount of movement of the interposed member, wherein
- the interposed member is formed to be able to move substantially parallel to a direction of movement of the on-off valve and abuts against the spring device at the other end part at the opposite side from the one end part,
- the spring device is formed so as to contract using a change in pressure of the combustion chamber as a drive source when the pressure of the combustion chamber reaches a predetermined control pressure,
- when the combustion chamber reaches the control pressure during the time period from the compression stroke to the expansion stroke of a combustion cycle, the spring device contracting causes the tapered plug part and the interposed member to move toward the outside of the combustion chamber and the combustion chamber to increase in volume, and
- the engine detects the operating state of the internal combustion engine, selects a maximum pressure of the combustion chamber in accordance with the detected operating state, and uses the selected maximum pressure of the combustion chamber as the basis to restrict the amount of movement of the interposed member.
(canceled)
Dependencies are inferred from the claim text.