Abstract:
The idle exhaust pressure relief system (34, 37, 32, 33) in an outboard motor (10) is utilized to simultaneously heat the engine crankcase (18) or other parts of the fuel supply system to prevent the puddling of fuel typically occurring at lower engine temperatures. Because the idle exhaust pressure relief system is inherently operable to conduct hot exhaust gases out of the exhaust manifold (26) only at idle or low speed operation, heat is supplied to the crankcase only at temperatures when fuel puddling typically occurs.
Abstract:
In a two cycle internal combustion engine (2), a fuel-air flow passage and reservoir (52) is provided along the exhaust bridge (34) and between the piston (4) and the cylinder inner wall (36) for lubricating the exhaust bridge (34). The piston (4) has a flat spot (50) machined on its side wall (38) to form an axially extending flow passage and reservoir closed at its top end by the piston rings (40) and at its bottom end by a lower portion (60) of the piston side wall (38) which is not machined and which is closely adjacent the cylinder inner wall (36). When the piston (4) is in its power stroke, crankcase pressure forces fuel-air mixture through holes (56, 58) in the piston side wall (38) at the flat surface (50) into the flow passage and reservoir (52). If the exhaust bridge (34) heats and expands into the cylinder (6), the piston (4) will not rub on it.
Abstract:
In a two cycle internal combustion engine (2) having a cylinder liner (14), a fuel-air flow passage (52) is provided from the crankcase (8) to the exhaust bridge (38) in the cylinder liner (14) and the exhaust bridge (39) in the cylinder block (12) along the interface between the cylinder liner (14) and the cylinder block (12). A plurality of apertures (57-60) are provided through the cylinder liner (14) communicating with the fuel-air flow passage (52). A second fuel-air flow passage (56) is provided between the piston (4) and the cylinder liner (14) and in communication with the apertures (57-60) to facilitate fuel-air mixture flow through the exhaust bridge (38) to improve lubrication and cooling thereof.
Abstract:
In a marine propulsion system including an internal combustion engine, a mixing tube assembly (14) is disposed between an exhaust manifold and a discharge pipe for discharging mixed water and exhaust. The mixing tube assembly is adapted for connection to the exhaust manifold (12) by means of a resilient connector member, such as a flanged rubber boot (18). This form of connection allows the adjacent surfaces of the mixing tube and the manifold to be non-machined, and provides suspension of the mixing tube from the manifold. The mixing tube includes an exhaust passage (42) having a water jacket (54, 56) therearound for cooling exhaust passing therethrough. A water inlet (58) is provided for introducing water into the water jacket. Water is discharged from the water jacket through a circumferential water discharge outlet (62), and exhaust is discharged from the exhaust passage through an exhaust outlet (46). A mixing cavity (64) is disposed downstream of the water jacket and the exhaust passage for receiving discharged water and exhaust and mixing the water with the exhaust prior to discharge through a discharge outlet.
Abstract:
A marine propeller (4) combines decreasing overall pitch from hub (6) to blade tip (20) and increasing progressiveness of pitch with increasing radii from hub to tip, and provides uniform loading from hub to tip. The blade has a maximum transverse dimension (36, 46, 48) between the high pressure surface (26) of the blade and a straight line chord (34, 34a, 34b) between the leading edge (22) and the trailing edge (24) of the blade. The ratio of this maximum transverse dimension to the length of the chord is ever increasing from hub to tip. A parabolic blade rake along the maximum radial dimension line (50) of the blade is provided in combination.
Abstract:
A single cable shift assembly includes a casing (30) mounted to a surface adjacent the pull-pull cables (14, 16) of a shift/throttle control linkage. A pair of pulleys (34, 36) direct cables (14, 16) in opposite directions. A slide (38) within casing (30) includes anchors (40, 42) for securing the cable ends to spaced positions along the longitudinal axis of the slide. The slide is provided with a connector pin (44) that secures the control cable (48) to the slide and translates linear movement of the control cable into linear movement of the slide.
Abstract:
Adherent, PTFE coatings on polymer surfaces can be produced at temperatures well below the sintering temperature of PTFE, by contacting the surface with a dilute dispersion of PTFE particles and heating the surface to its softening point (in the vicinity of its glass transition temperature) to dry it and to cause the individual particles to become embedded in and surrounded by the polymer.
Abstract:
A timing circuit for stabilizing idling of an internal combustion engine, particularly marine racing applications where idle speed must be reduced to enable gear engagement, notwithstanding the use of a racing cam otherwise requiring higher idling speed. Delay means (8) provides a radical reduction in spark timing along a negative slope (16) relative to a baseline curve (6) up to a predetermined speed such as 900 rpm at which there is maximum relative timing delay (18). A speed increases in this range, there is more retard because of the negative slope, which further retarded timing slows engine speed, hence providing self-stabilization. As engine speed decreases in such range, there is less retard, and the advanced timing increases engine speed, again providing self-stabilization. At engine speed increases above the predetermined speed such as 900 rpm, there is a rapid advance in timing along a steeper positive slope (20) to merge with the baseline curve (6). Cranking and warm-up control circuitry (12) and acceleration detection circuitry (14) are also provided for eliminating or reducing the relative timing delay under conditions where maximum spark advance is desired.
Abstract:
Metal chelates and therapeutic or diagnostic conjugates of site-specific compounds, metal chelates, and metal ions are described. The metal chelates consist of at least two molecular components linked together. One molecular component is a chelate having a high affinity for metal ions and a high Ks value. The other molecular component is a chelate having a low Ks value and the ability to undergo rapid metal exchange.
Abstract:
An article of protective wear is disclosed which has a multilayer/multipolymer configuration so that enhanced protection against more than one type of material, such as hydrocarbons and chemical warfare agents, is provided. More specifically, the article has a first layer (68) comprising a hydrocarbon resistant resin and a second layer (64) having a resin modified butyl rubber layer, the butyl rubber base being characterized in having crosslinks formed by a resin rather than by sulphur or sulphur bearing materials. Also disclosed is a method of formation of such articles.