摘要:
An exhaust gas purification device comprising a three way catalyst, an oxidizing catalyst and a NOx absorbent which are arranged in this order in the exhaust passage. A rich air-fuel mixture is burned in the combustion chamber, and the exhaust gas discharged from the engine is initially introduced into the three way catalyst. Secondary air is fed into the exhaust passage between the three way catalyst and the oxidizing catalyst so that the air-fuel ratio of the exhaust gas flowing into the oxidizing catalyst and the NOx absorbent becomes lean.
摘要:
A two-stroke engine including a pair of intake valves which are symmetrically arranged with respect to a symmetrical plane including the axis of the cylinder. A masking wall is provided for each intake valve to mask the valve opening between the valve seat and the peripheral portion of the intake valve, which is located on the exhaust valve side, for the entire time for which the intake valve is open. These masking walls are also symmetrically arranged with respect to the symmetrical plane.
摘要:
A gate array for implementing a digital integrated circuit includes first cells and second cells of different kinds which are selectively usable depending upon the application of the gate array, i.e. the first cells for applications which need only a low driving ability and the second cells for applications which need a high driving ability.
摘要:
A two-stroke engine having an intake valve and an exhaust valve which are arranged on the cylinder head. The peripheral portions of the inner wall of the cylinder head around the intake and the exhaust valves are cut away, and the peripheral portions of the top portion of the inner wall of the cylinder bore around the intake and the exhaust valves are cut away. A masking wall is formed on the inner wall of the cylinder head to mask the valve opening between the valve seat and the peripheral portion of the intake valve, which is located on the exhaust valve side, for the entire time for which the intake valve is open.
摘要:
A two-cycle internal combustion engine comprises a cylinder head having an intake port and exhaust port opened to a combustion chamber, to which compressed fresh air is introduced via an intake valve. An inclined concavity is formed on a top face of a piston. An exhaust valve is opened earlier than the intake valve when the speed of the downward movement of the piston is relatively high, so that a part of exhaust gas in the exhaust port flows back to the combustion chamber in that condition. An exhaust gas swirl rotating around a cylinder axis is formed when the exhaust gas flows back and the fresh air is slowly introduced onto the exhaust gas swirl in that condition. The inclined concavity serves to smoothly guide the exhaust swirl.
摘要:
A two-cycle internal combustion engine comprises a cylinder head having two intake ports and an exhaust port opened to a combustion chamber, to which compresses fresh air is introduced via two intake valves. The intake and exhaust valves are operated in response to a crank angle. During an idling or light load running condition, an air control valve closes the second intake port. The exhaust valve is opened earlier than the second intake valve, and the first intake valve is opened later than the second intake valve, while the speed of the downward movement of the piston is relatively high. An exhaust gas swirl rotating around a cylinder axis is formed when the exhaust gas flows back into the condition chamber and the fresh air is slowly introduced via the first intake valve onto the exhaust gas swirl in the idling or light load condition. A large amount of fuel is rapidly introduced into the combustion chamber via the second intake valve in a heavy load condition.
摘要:
A valve actuating apparatus for intake and exhaust valves in an internal combustion engine having a swing rocker arm consisting of two arms rotatably interconnected by means of a connecting shaft, one of the arms being rotatably connected to a rocker arm shaft and the other bearing against a valve stem so that the two arms can selectively occupy an operative position, in which the two arms extend substantially straight to form a single rocker arm, and an inoperative position in which a relative rotation between the two arms takes place to absorb the rotation of the cam. A lock pin is provided in one of the first and second arms to prevent relative rotation of the two arms and to lock them to the operative position, and an actuator for releasing the lock at a predetermined time, the locking means and unlocking means having directions of operation substantially perpendicular to and across the axis of the connecting shaft.
摘要:
An apparatus for controlling the proportion of air and fuel in the air-fuel mixture of the internal combustion engine includes a carburetor having a main system fuel tube, a main system air-bleeding passage, a slow system fuel tube and a slow system air-bleeding passage, and an electromagnetic control valve having an air-inlet port, a first outlet port communicating with the main system air-bleeding passage and a second outlet port communicating with the slow system air-bleeding passage, and internally provided with a moving-coil type linear motor. The electromagnetic control valve is adapted to cause the first outlet port to start to communicate with the air-inlet port a predetermined period of time after the second outlet port has started communicating with the air-inlet port, when an analog electric signal is applied to the linear motor.
摘要:
A multi-cylinder engine comprising a carburetor housing forming therein at least two branch mixture passages. Each of the branch mixture passages is connected to a respective intake port. A throttle valve of the carburetor is provided for each cylinder. Each of the throttle valves is arranged in the respective branch mixture passage and attached onto a common throttle shaft. A wedge shaped groove is formed on the bottom inner wall of each of the branch mixture passages, and the common throttle shaft is arranged in the wedge shaped groove for causing the mixture to flow only along the upper wall of the branch mixture passage. A single common connecting passage and branch connecting passages which are connected to the common connecting passage are provided. Each of the branch connecting passages opens into the respective intake port in the vicinity of the rear face of the valve head of the corresponding intake valve and is tangentially connected to the inner wall of the corresponding intake port, said wall extending circumferentially about the axis of the corresponding intake valve.
摘要:
An internal combustion engine comprising a first raised portion formed on the inner wall of the cylinder head, a second raised portion formed on the top face of the piston at a position opposite to the first raised portion with respect to the axis of the piston, and a third raised portion formed on the inner wall of the cylinder head above the second raised portion. A first flat squish area is formed between the flat peripheral top face of the piston and flat bottom face of the first raised portion. A second spherical shell shaped squish area is formed between the spherical bottom wall of the third raised portion and the spherical rear face of the second raised portion. A pair of spark plugs is arranged on the top face of the combustion chamber. One of the spark plugs is arranged in the vicinity of said first raised portion, and the other spark plug is arranged in the vicinity of said third raised portion.