Abstract:
A piston cooling nozzle for an internal combustion engine includes a two-part construction comprising a mounting base and a main body. The mounting base includes a substantially flat end panel which is designed to attach directly to a plateau area on the engine block. The mounting base also includes a plug portion which is designed to seal closed an open end of the main body. The main body includes a through hole which is located in communication with an engine oil rifle. The main body represents a single piece component with an extension arm and cooling nozzle head. The extension arm includes a plurality of drilled passageways which are in communication with four flow jet apertures in the cooling nozzle head. The cooling nozzle head has a generally triangular shape and the four flow jet apertures are arranged so as to track the arc-like curvature of the corresponding piston cooling gallery. Oil flowing through the oil rifle passes through the extension arm and exits from the cooling nozzle head as four narrow and well defined jets of oil. These four jets of oil are targeted at an entrance area for the piston cooling gallery. The configuration of the piston cooling nozzle is such that it may be installed directly into an assembled engine without interference. By dividing a single flow stream into four individual jets, there is a increase in the length to diameter ratio resulting in less stream divergence and a more targeted spray.
Abstract:
An improved lubrication system for a two-stroke engine having a lubrication path from an oil sump directly to an induction valve assembly for noise reduction. The oil sump is divided into two chambers with a restricted passage therebetween to ensure lubrication of transmission gears upon startup while reducing drag during operation. A cross-drilled lubrication passage through each crankshaft throw terminates in a second passage proximate a dead-end plug, the second passage being in communication with the piston rod bearing. Each piston skirt includes at least one axial groove in registration with an oil supply passage. Circumferential grooves distribute the oil around the piston skirt from the axial grooves. The pistons may include ceramic top layers for heat insulation to increase the compression ratio possible by raising the ring positions. The engine incorporates an air/oil mixture separator within a balancer shaft chamber and air from the chamber is directed to the intake system.
Abstract:
A ring for protecting the edge of a combustion bowl disposed within a top surface of a light-alloy piston for a diesel engine. The ring is made of fine-grain carbon and serves as bowl edge armor. The ring is galvanically coated before being bonded to the remainder of the piston. The exterior surface of the bowl edge armor is coated with an antioxidation compound.
Abstract:
A Co-based alloy exhibits superior high-temperature strength and resistance properties. In one embodiment, the Co-based alloy contains, in weight percent, from about 0.1 to about 1.2 of C; from about 0.01 to about 2 of at least one of Si and Mn; from about 22 to about 37 of Cr; from about 5 to about 15 of Ni; from about 0.1 to about 3.5 of Re; with a balance being Co and incidental impurities. Co and C, Si, Mn, Cr, Ni, Re, B, Zr, W, Mo, Ta, and Nb impart high-temperature wear resistance to the alloy to withstand repeated temperature cycling in a glass spinnaret. In one embodiment of the present invention, Hf is added to improve molten glass corrosion resistance, while Y and other rare earth elements are added in alternate embodiments to improve high-temperature oxidation resistance. Percentages by weight are disclosed for enhanced high-temperature oxidation resistance, increased fluid wear resistance and enhanced molten glass corrosion resistance.
Abstract:
The rapidly solidified aluminum alloy powder is preformed in a cold or warm environment to form a powder compact having a relative density of 75-93%. Then, the preformed compact is heated and degassed in the atmosphere of an inert gas at temperature of 300.degree. C. to 560.degree. C. for 0.25-3 hours. Immediately thereafter, the compact is subjected to hot coining at 300.degree.-560.degree. C. to obtain a solidified compact having pores at a rate of 2-5%. The solidified compact is then subjected to sizing. Since the inorganic gas prevents reaction between the evaporated water and aluminum while preheating the compact, the hot coining can be carried out in a state where solid state diffusion easily occurs. Thus, the powder particles can be bonded together strongly with a single forging. Also, at the end of hot coining, pores remain in the solidified compact at the rate of 2-5%. Utilizing these pores, the compact can be subjected to sizing to improve its dimensional accuracy. The rotor for an oil pump thus formed can withstand use at high temperatures.
Abstract:
A method for the manufacture of a cooled piston head in which the upper and lower portions of the piston head are made separately a metal plate is placed on the lower side of the upper portion; then the upper portion incorporating the metal plate is joined to the lower portion by friction welding. The metal plate is provided with a central hole for the passage of cooling oil onto the undercrown, and means of communication with a closed cooling chamber defined by a circumferential groove on the head upper portion and the peripheral outer surface of the metal plate.
Abstract:
The design and construction of past piston assemblies having a wrist pin bolted to a connecting rod have excessive weight and structural components, and requires more complex machining techniques and tooling. The present invention overcomes these problem by providing a piston assembly (30) with a wrist pin (36) attached to a piston member (32). Thus, the length of the leg members (80) are short and do not require a portion surrounding the wrist pin (36). The results being reduced piston member (32) and piston assembly (30) weight and lower inertia, a simplified forging or casting process, a more easily machinable cavity (86) within the piston member (32) and a higher quality piston assembly (30).
Abstract:
A piston for a combustion engine includes an external cylindrical body having an inner cavity. In the inner cavity is a partly spherical little-end of a connecting rod and a fluidtight shell or hemispherical dome. An edge portion of the dome is annularly connected a lower part of the cylindrical body so that the shell or dome bears on the little-end along a closed circular contact line or band during rest or minimum pressure parts of the cycle of operation. Oil is supplied under pressure and through a check valve to into an interstice between the little-end and the shell above the contact line. An upper incompressible space is provided between an outer surface of the shell and the cavity. The shell is maintained taut in operation between the little-end and an annular zone by which the edge portion is connected to the lower part of the cylindrical body. The shell is sufficiently thick but resilient to ensure that the shell is capable 1) of transmitting to the little-end the forces exerted by the working gas on the piston through the annular zone, and 2) of deforming under a tension resulting from these same forces, so that the volume of the interstice is cyclically reduced and the area of the contact band increases.
Abstract:
The design and construction of past piston assemblies having a wrist pin retained by a pair of snap rings positioned in a groove. Other past piston assemblies have a stubpin or cap positioned within a bore of a piston member or the wrist pin. In these applications the stubpin or cap is in continuous contact along the interface between the bore and the stubpin or cap. The present invention provides a device for retaining a wrist pin within a pair of bores of a piston member during operation of an engine. The device includes a shank portion having an outer portion thereon and only the outer portion of the shank portion being in contact with an inner surface of the wrist pin. The device and the wrist pin forming a wrist pin assembly. Thus, the device remains positioned within the inner surface and properly positioned the wrist pin assembly within the bores during operation of an engine within a bore of a cylinder liner. This configuration also increases the contact area between the wrist pin and the piston member increasing the life and dependability of the engine.
Abstract:
An internal combustion engine having an engine block containing a plurality of cylinder bores and a piston slidably mounted in each bore. The block is composed of a hypereutectic aluminum-silicon alloy containing from 16% to 30% silicon and having precipitated primary silicon crystals, while the piston is composed of an aluminum-copper alloy containing from 10% to 15% by weight of copper.