Abstract:
A lubricating system for a two cycle internal combustion engine as applied to an outboard motor wherein small amounts of lubricant can be pumped by a diaphragm type pump through the use of an air bleed that mixes air with the lubricant being pumped. Pulsation variations are minimized by supplying the pump with lubricant with a constant volume delivery chamber.
Abstract:
A piston for internal combustion engines, which has inclined surface portions in the skirt area to allow formation of hydrodynamic wedges of lubricant, these surface portions being constructed as skirt recesses (13 or 14) which are open either towards the upper or towards the lower end of the piston skirt. The transition zone from these skirt recesses to the bearing surface of the working surface of the piston is constituted by oblique surfaces which are inclined inwardly from the surface of the skirt. The oblique surfaces terminate in a circumferential direction within the bearing surfaces of the piston. The oblique surfaces constitute ramps on which a hydrodynamic wedge of lubricacting oil can form. The particular advantage of disposing the oblique surfaces in skirt depressions which are only open at one end lies in that when the hydrodynamic wedge of lubricating oil builds up as a result of the translatory motion of the piston, the oil which forms the wedge of lubricant cannot escape in a peripheral direction which thereby increases the frictional quality (or aqua-planing effect) between the working surfaces of the piston and cylinder.
Abstract:
In combination with an internal combustion engine having a crankcase in which an air/oil mist mixture exists during normal operation of the engine, a pump having a crankshaft journalled in a crankcase, a cylinder, a piston coupled to said crankshaft to reciprocate in the cylinder, an intake and a return passage each communicating the pump crankcase with said engine compartment, and one-way valves in each of said passages arranged so that reciprocation of the pump piston will circulate the air/oil mist mixture from the engine compartment through the pump crankcase to provide lubrication to the compressor crankshaft and piston.
Abstract:
An apparatus comprising a cylinder, a piston located in part in the cylinder and movable relative thereto, an elastic tube member sealingly engaging the piston and the cylinder at spaced locations and at least partially defining a working chamber, the tube member stretching and contracting and the working chamber varying in volume upon relative movement of the piston and the cylinder, the tube member having a portion sliding against the inner wall of the cylinder as the volume of the working chamber varies and a ring member encircling the tube member and located between the tube member and the cylinder inner wall in the connection region of the tube member and the piston.
Abstract:
A method and a device for draining oil from the gear case of an oil-injected rotary compressor is disclosed in which a pressure is taken out from the compressor to pressurize the gear case so as to drive the oil, against the action of gravity, to a low pressure area of the compressor.
Abstract:
An oil pressure detecting apparatus for an internal combustion engine comprises an LC oscillator having an inductance variable in dependence upon variation in the oil pressure of the engine. The frequency or voltage of an output signal of the oscillator is compared with that of a reference signal having a predetermined relation to the number of revolutions of the engine, thereby to determine if the oil pressure is within an acceptable range.