摘要:
A valve seat and cylinder head arrangement wherein the valve seat is formed by a pressing and electrical heating operation to form a bonded valve seat.
摘要:
A method and apparatus for testing a ceramic member applies mechanical stress to the member by application of mechanical force and simultaneously applies thermal stress by creating a temperature gradient in the member by localized heating of a portion thereof. The mechanical stress is impact stress or may be applied by application of a static load to the ceramic member. The method is especially applied to the proof-testing a plurality of ceramic members for quality assurance, particularly engine valve members.
摘要:
Internal combustion engines with a cylindrical working chamber (1) in which there slides a piston (3), and which is closed by a cylinder head (4) with a device (5) for injecting atomized liquid fuel under high pressure and operating on the two-stroke cycle with a loop-scavenging system across the cylinder head, with two axisymmetric valves with coincident axes, one of these, an external, inlet valve (7) interacting with a seat (15) in the cylinder head and the other, an exhaust valve (6), exhibiting a tubular shape with a bearing surface applied against a seat (16) formed at the lower part of the inlet valve (7), the inlet valve opening towards the working chamber and the exhaust valve opening in the opposite direction, in order to delimit an exhaust passage (8) between them, the injection device (5) emerging in the working chamber substantially at the centre of a central hub (21) borne by the cylinder head and about which the exhaust valve (6) slides.
摘要:
A fuel injection control system for an internal combustion engine which can eliminate lean misfiring and rich misfiring at asynchronous injection and exhausting of non-combustioned HC. When the asynchronous injection is performed at engine cranking or at acceleration, a judgement is made as to whether the injected fuel will be divided by closure of an intake valve. When division is not detected, fuel injection is performed in normal manner. When division is detected, rate of the fuel division is computed. As a result of computation, fuel injection is performed when judgement is made that a predetermined amount of the injected fuel will be introduced into the cylinder. Furthermore, the amount of fuel not introduced into the cylinder is computed to reduce a corresponding amount from a fuel injection amount for the next cycle. On the other hand, when judgement is made that the predetermined amount of fuel will not be introduced into the cylinder, fuel injection does not take place.
摘要:
The surface of a workpiece is provided with a surface layer. Initially, the workpiece is inductively heated by a HF/MF generator to a first temperature and subsequently heated further by a laser beam with coating material being applied to the region of the laser beam in an amount sufficient to form a surface layer on the workpiece. The generator and the laser source are able to operate simultaneously to effect a high quality surface layer of relatively thin thickness.
摘要:
A mounting aid arranged for receiving a valve-actuating sub-assembly intended for installation coaxially about a valve stem. The sub-assembly includes a valve coil spring, a spring retainer having a central aperture and a split collar. The mounting aid has a closing disc having an outer circumference and being arranged for engaging an outer radial surface of the spring retainer coaxially therewith; an axial extension attached to the closing disc at the outer circumference thereof; and hold-back means formed on the end of the extension for releasably securing the sub-assembly to the axial extension.
摘要:
Valve lifts are measured with a reference engine assembled correctly, at at least two crank angles, and the relationship between the crank angle and the valve lifts is memorized in an arithmetic unit. Thereafter, the crank shaft of an engine, the valve actuating system of which is to be examined, is indexed at the above-mentioned crank angles in the assembled state of the engine, and the valve lifts are measured at these crank angles. The measured data are delivered to the arithmetic unit which performs an arithmetic operation to determine whether there is any abnormality in the valve actuating system and to make the display of the result of the determination.
摘要:
An exhaust gas purifying system for an internal combustion engine including at least one combustion chamber connected to an intake port through an intake valve. The system comprises a first passage for passing a portion of exhaust gases discharged from the combustion chamber, a second passage for passing air, a fluid passage, at least one fluid injection nozzle having its one end connected to the fluid passage and the other end extending into the intake port toward the combustion chamber, the fluid injection nozzle adapted to open when the intake valve opens, and means responsive to engine operating condition for connecting the fluid passage to the first passage to permit injection of exhaust gases through the fluid injection nozzle into the combustion chamber during acceleration and for connecting the fluid passage to the second passage to permit injection of air through the fluid injection nozzle into the combustion chamber during normal operation or idling.
摘要:
A DEVICE FOR VACUUM TESTING THE SEAL BETWEEN THE HEAD OF AN INTAKE OR EXHAUST VALVE OF AN INTERNAL COMBUSTION ENGINE, AND ITS SEAT. THE DEVICE APPLIES A VACUUM TO ONE SIDE OF THE HEAD OF THE VALVE TO TEST THE SEAL BETWEEN THE HEAD AND THE SEAT, THE MAGNITUDE OF THE VACCUM ATTAINABNLE BEING MEASURED TO PROVIDE AN INDICATION OF THE QUALITY OF THE SEAL. THIS SAME VACUUM IS USED TO SEAT THE HEAD OF THE VALVE AND TO HOLD THE DEVICE IN ENGAGEMENT WITH AN APPROPRIATE PART OF THE ENGINE. THUS, IT IS NOT NECESSARY TO COMPLETELY INSTALL THE VALVE, AS IN THE CASE OF A DEVICE REQUIRING THE PRESENCE OF THE VALVE SPRING TO HOLD THE HEAD OF THE VALVE ON ITS SEAT. ALSO, IT IS NOT NECESSARY TO PROVIDE ANY SEPARATE MEANS FOR HOLDING THE TESTING DEVICE IN PLACE.