352 results about "Scavenging" patented technology

The device includes a set of rotatable vanes and a set of stationary vanes which are mounted within a cylindrical housing. The set of rotatable vanes are connected to a post located at the axis of the housing and rotate relative to the post in response to the intake or exhaust fluid impinging on the vanes which are angled relative to the direction of flow of the fluid stream. The set of stationary vanes are rigidly secured to the post and also rigidly secured to the housing walls. The set of stationary vanes are positioned adjacent the set of rotatable vanes and are similarly angled relative to the direction of flow of the fluid stream in order to deflect the fluid stream and impart a swirling motion to the fluid stream in order to provide more complete mixing of the air / fuel mixture of the intake fluid stream or scavenging of the exhaust fluid stream. Tabs which extend radially outwardly from the housing ends secure the device within an intake or exhaust passageway.

In a two-stroke engine (1) according to the present invention, a piston (6) has a communication passage (28) opened to a crank chamber (10). An air intake port (30) is provided on an inner surface (2a) for causing air to flow into the communication passage (28). After a scavenging port (22) is closed by an outer surface (6a) of the piston (6) moving from the bottom dead center to the top dead center, the communication passage (28) is opened in the outer surface (6a) of the piston so as to communicate with the air intake port (30) and the scavenging port (22).

The intermittent linear motor of this invention incorporates features which enhance the exhaust scavenging and cooling processes, as well as simplifying overall construction including a compression plenum below the piston where air displaced during a power stroke by the piston is immediately transferred through the combustion chamber allowing said compressed air to immediately begin scavenging exhaust gases as the piston is returned further displacing spent gases from the motor.

The invention relates to energy conservation and emission reduction, in particular to an emission-reduction two-stroke gasoline engine with scavenging passage wedge turbulent flow return sheets. The emission-reduction two-stroke gasoline engine is characterized in that in order to pursue scientific exploration, many improvements are performed on a spark plug such as internal inductive reactance is added on various fixed electrodes, an external dividing coupling is improved, a casing radiating fin is added, and especially a moving electrode and a micro electrode are arranged. In addition, combustion chambers are matched with various ignition devices, wherein the combustion chambers include combustion chamber with function waves and parabolic combustion chambers to be convexly and concavely matched and with function waves. A double-auxiliary skirt border is additionally arranged on a piston skirt portion. The wedge turbulent flow return sheets (46) are respectively symmetrically arranged on the left side and the right side of a scavenging passage of a cylinder, and each wedge turbulent flow return sheet comprises a scavenging passage (47), a wedge (48) connected with the scavenging passage, a return rid (49) connected with the scavenging passage and a turbulent flow shield (50) connected with the scavenging passage, and accordingly the emission-reduction two-stroke gasoline engine is favorable for generating turbulent flow at the scavenging passage position to resist waste gas returning and further to reduce emission, and finally the effect of reaching the emission reduction standard is achieved. The emission-reduction two-stroke gasoline engine has the advantages of being favorable for assisting guide, assisting emission reduction and noise reduction and assisting lubrication and heat dissipation, being reliable in igniting and improving efficiency.

In a method for operating an internal combustion engine having at least one cylinder which includes a first exhaust valve and a second exhaust valve, the internal combustion engine is operated in a scavenging operating mode in that the closing times of the exhaust valves after an ejection stroke of a four-stroke operating cycle are situated after an opening time of an intake valve, and the second exhaust valve is opened with a time delay relative to the first exhaust valve in the scavenging operating mode.