Abstract:
The spray tip of a diesel fuel injector, downstream of a conventional pressure actuated injector needle valve, includes a plug holder used to support and retain a hollow inner plug valve element, containing a number of radial through orifices communicating with an annular groove in the outer peripheral surface of the plug valve element and an outer hoop valve element with a hoop-skirt valve encircling the inner plug valve element. A shrink-fit exists between the hoop-skirt valve and the inner plug valve element to provide for a zero sac volume spray tip. The hoop-skirt valve operates as an integral hoop valve which is expanded relative to the inner plug valve element when supplied with high pressure fuel to form therewith a fuel discharge annulus.
Abstract:
An internal combustion engine having an annular port and valve arranged to direct flow from dual inner and outer portions of the port in cylinder flow patterns having radially oppositely directed flow components. Various embodiments providing cylinder charge stratification or dual inlet and exhaust valve functions are disclosed.
Abstract:
A nozzle for injecting fuel into a combustion zone including a stationary nozzle body having a main fuel passage therethrough connected to a source of fuel under pressure, an auto-rotating tip disposed on the nozzle body for rotation about a main axis of the latter, a fuel distribution cavity between the tip and the nozzle body connected to the main fuel passage and filled with pressurized fuel, and a plurality of fuel passages in the tip exposed to pressurized fuel in the distribution cavity. Each of the fuel passages is disposed in a plane perpendicular to the main axis and is slanted relative to one of a corresponding plurality of radii emanating from the main axis so that jets of fuel issuing from the fuel passages develop reaction forces on the tip having components tangent to a circle about the main axis which reaction forces spin the tip to disperse fuel in the combustion zone in a volume of revolution about the main axis.
Abstract:
To measure the mass airflow into an engine having a manifold with a given volume, the mass airflow through an induction passage into the manifold is measured by a meter and the measured value is changed by an amount to compensate for changes of air density in the manifold. The manifold pressure and temperature are monitored and the correction value is calculated as where V is the manifold volume, R is a gas constant, T is the temperature and P is the air pressure in the manifold.
Abstract:
A hybrid bearing assembly includes a shaft rotatably supportable within a shaft housing by a hydrodynamic foil bearing acting in parallel with an antifriction bearing. The shaft is supported solely by the antifriction bearing at zero and low shaft speeds, and is supported solely by the foil bearing at the running speed. As the shaft accelerates from low speeds through running speed, support of the shaft is shared between the antifriction bearing and the foil bearing which act in parallel.
Abstract:
A stratified charge spark ignition internal combustion engine is arranged to provide a preferably centered target recess on the end of the piston to redirect fuel spray injected against the recess back into the central portion of the combustion chamber to form a centralized relatively rich core or mixture cloud surrounded by an annular body of air. The size of the centered mixture cloud is load variable as determined by the volume and timing of injection as well as other factors. A preferred embodiment includes a target shape which compensates for limited eccentricity and angularity of the nominally axial injection spray to maintain a relatively even distribution of fuel within the mixture cloud. An alternative arrangement also includes a small ignition antechamber surrounding the end of the injection nozzle.
Abstract:
Creation of a swirling stratified air-fuel charge in an engine combustion chamber is aided by a curved vane or scoop fixedly mounted on the cylinder end and arranged to divide the vortex gas flow introduced through the intake passage into segregated peripheral and core portions. The scoop may also serve as a fuel vaporizing surface and collector for surface quench products. Various arrangements are disclosed for forming a rich mixture in the central core portion adjacent the spark plug to provide the ignition and combustion advantages of a stratified charge.
Abstract:
A rotary engine is provided with a plenum that is charged with relatively high-pressure hot gaseous products from the working chambers during the gas expansion process but after rapid combustion is completed and then discharges these products into a trailing portion of the working chambers during the remainder of their expansion phase to cause mixing of the gases in the trailing portion with the other gases in the chamber.