Abstract: The invention provides, in one aspect, a lubrication system for internal combustion engines of the kind comprising a crankshaft (1) and an associated oil sump (3), a camshaft in a cylinder head above the oil sump, and a timing belt (5) connecting the crankshaft and camshaft via respective, pulleys (2, 4). In accordance with the invention, the timing belt is adapted to entrain a sufficient quantity of oil from the oil sump to lift it to the cylinder head for lubricating purposes, thereby eliminating the need for a separate oil pump. Preferably, an oil pulley (7) is provided below the crankshaft pulley (2) positioned to be immersed in oil within the oil sump for entraining oil therefrom.

Abstract: A rocker arm assembly includes a U-shaped rocker arm defined by a bottom wall and, two side walls depending upwardly therefrom where the side walls each have a central axle opening to support a transversely extending roller axle. A roller for rolling against a cam is rotatably supported on the roller axle through a roller bearing. The bottom wall of the rocker arm has a centrally located opening providing clearance for rotation of the roller and a spherical socket at a first end of the rocker arm to interface with an upper rounded end of a hydraulic lash adjuster. An oiling channel is provided along the bottom wall extending from the spherical socket, towards the roller, to terminate at the centrally located opening for channeling oil expelled from the hydraulic lash adjuster, wherein reciprocation of the rocker arm flings oil from the channel to the roller and roller bearing for lubrication.

Abstract: A four-stroke internal combustion engine in accordance with the present invention comprises a piston, a valve chamber, a crankcase, an oil chamber separated from the crankcase, and an oil mist feeding passage extending from the oil chamber to the crank case via the valve chamber for supplying oil mist in the oil chamber. The oil mist feeding passage has a first passage extending from the oil chamber to the valve chamber, a second passage extending from the valve chamber to the crankcase, and a third passage extending from the crankcase to the first passage. The first passage has a first opening directed toward the oil chamber. The second passage has a second opening directed toward the crankcase located at a point where it can be closed by the piston when it travels downwardly. The third passage has a third opening directed toward the crankcase located at a point below a bottom dead center of the piston.

Abstract: An oil passage structure of an engine is provided, wherein oil is prevented from being drained from an oil passage when the engine is stopped, and air mixed into the oil in the oil passage can be surely removed. The oil passage structure includes a first oil path or paths for supplying oil to lash adjusters of a cylinder head of the engine, a second oil path that communicates with an oil pump and supplies oil into an upstream portion of each first oil path, and an air vent passage that is connected to a downstream portion of each first oil path and has an opening through which the air is to be removed from the oil path. The second oil path and the opening of the air vent passage are located at higher positions than the first oil path(s).

Abstract: A tappet comprises a foot having a convex cam contact surface and an axially extending hub, a tappet body having a lower body portion with a lower axial bore formed therein to receive the axially extended hub of the foot, and a bearing assembly positioned between the foot and the lower portion of the tappet body. The cam contact surface operates in a frictional relationship with a cam lobe of a rotating cam. The frictional relationship between the cam lobe and the cam contact surface of the foot induces the foot to rotate about the center line of the tappet. The bearing assembly operates to reduce friction as the foot independently rotates axially about a center line of the tappet body.

Abstract: A cam roller pin for mounting a cam roller with a substantially uniform width to a rocker lever includes a substantially cylindrical pin body bounded by a pair of oppositely-disposed ends and having a length which extends from one end to the opposite end, the pin body defining an oblong trough therein which has a length that is at least 30 percent of the length of the pin body. The pin body has an outer surface which defines a passageway extending from the outer surface through the pin body and into one end of the oblong through. The passageway is configured with two portions having different entry locations into the pin body and the passageway provides a path for lubrication from the exterior of the cam roller pin to the oblong trough.

Abstract: A high strength, lightweight camshaft for an internal combustion engine, comprising a shaft body having an axially oriented hollow interior extending a predetermined length from between a pair of spaced points, respectively, adjacent the ends of the shaft body. Plural camshaft journal bearings are spaced apart on the shaft body and include a pair of end camshaft journal bearings positioned adjacent the ends of the shaft body, respectively, with at least one inner camshaft journal bearing positioned intermediate the pair of end camshaft journal bearings. Each end camshaft journal bearing has a lubricant transfer means formed therein for receiving lubricant from an external supply and for transferring lubricant into the hollow interior of the camshaft.

Abstract: To increase available space for intake ports in an internal combustion pushrod type overhead valve engine, pushrod and pushrod bores running adjacent the ports are repositioned away from the ports. New valve lifters are provided with pushrod seats which are offset in the desired direction. Further offset is also provided by boring new valve lifter bores for the new valve lifters, which valve lifter bores have longitudinal axes that are also offset in the desired direction. Rocker arms are also provided with pushrod seats being offset in the same direction and by the same magnitude as the offset pushrod seats and the valve lifters. This offsetting of the pushrods away from the adjacent ports allows additional space for increasing the size and cross-sectional area of the ports to increase the breathing and power of the engine.

Abstract: The system provides a lubricating fluid between a wall which defines a cavity and a member which passes through the cavity. The system includes a passageway for supplying lubricating fluid to the cavity at a velocity and a fluid outlet for introducing the fluid from the passageway to the cavity such that a centrifugal force, corresponding to the velocity of the fluid supplied from the passageway, acts on the fluid flowing from the fluid outlet to cause the fluid to have a laminar flow over the cavity wall.

Abstract: An internal combustion engine has a valve cover enclosing a plurality of rocker arm assemblies and associated valve stems and springs. The valve cover is provided with an integral manifold that is supplied with pressurized lubricant. There is at least one opening from the manifold to each rocker arm assembly. Within each opening is a jet body that supplies lubricant under high pressure directly onto an associated rocker arm assembly and associated valve stem and valve spring.

Abstract: A lubricating system for a valve seat of an internal combustion engine produces a lubricant oil film on the valve seat (7) of a seat ring (2) providing the valve seat. At least a part of the seat ring (2) providing the valve seat surface (7) is made of a porous material (6, 9) readily containing lubricant oil. The outer cylindrical surface of the seat ring (2) is formed with an annular groove (4) along its circumferential direction. A cylinder head (1) to which the seat ring (2) is fastened is formed with an oil passage (5) for feeding lubricant oil to the groove (4). Feeding of the lubricant oil through the oil passage (5) to the groove (4) causes the valve seat surface (7) providing the part of the seat ring (6, 9) made of the porous material to contain lubricant oil. The lubricant oil thus contained produces a lubricant oil film on the valve seat surface (7), which prevents wear in the valve head and the valve seat surface.

Abstract: A structure of internal combustion engine comprises a cylinder member composed of a cylinder which accomodates a piston connected with a crankshaft, a crankcase provided to accomodate said crankshaft, a rocker case provided to accomodate a valve actuating mechanism, an oil return passage constituting means for leading oil in said rocker case into said crankcase, and a restraining means for restraining an air flow within said crankcase from entering into said oil return passage constituting means. By the effect of the restraining means provided in relation to the oil return passage constituting means, the air flow generated by the rotation of the crankshaft does not work as a dynamic pressure of hingering the flowingdown of oil.

Abstract: Oil is supplied from an oil pump as working oil to hydraulic lash adjusters and also as lubricating oil to journals and cams of a camshaft. The oil passage system includes a first supply passage connected to the oil pump, a second supply passage connected between the first supply passage and a first distribution passage coupled to a group of hydraulic lash adjusters, a joint passage connected to the first distribution passage, and a second distribution passage coupled to the joint passage and connected to another group of hydraulic lash adjusters. The second distribution passage is connected by air vent passages to a lubricating oil passage which supplies the camshaft with the lubricating oil. The joint passage is connected to one of the camshaft journals by a relief passage having a relief valve.

Abstract: A lubricating system for an internal combustion engine is disclosed. This system includes a pair of passages formed between a crank chamber for reserving oil and an air-oil separating chamber accommodating a mechanism for actuating overhead valves. The pair of passages are constituted by a breather passage formed in the upper portion of a cylinder and the oil-returning passage formed in the lower portion of the cylinder. The breather passage has a valve for allowing a fluid to pass solely toward the air-oil separating chamber and a large oil-circulating resistance is imparted to the fluid flowing toward the air-oil separating chamber through the oil-returning passage, thereby circulating an oil mist in one direction only by using the reciprocal motion of each piston. Even when the engine is inclined, oil is prevented from flowing back from the crank chamber to the separating chamber through the oil-returning passage.

Abstract: A rocker arm assembly for an internal combustion engine is provided which is lightweight and inexpensive to manufacture, which securely mounts and supports a pair of rocker arms and associated structures on the cylinder head of an internal combustion engine, and which provides and maintains a supply of lubricant to the rocker arm bearing structures, valves and push rods. The rocker arm assembly includes a two part pedestal which clamps the shaft on which the rocker arms are journaled to the engine. The base portion of the pedestal includes a pair of positioning projections which position and support the pedestal so that the proper alignment of the rocker arms relative to the longitudinal axis of the engine is achieved and maintained.

Abstract: An improvement in an engine having conventional components including at least one valve, pivotally mounted rocker arm for operating the valve, reciprocally moveable member for effecting pivotal movement of the rocker arm, the improvement being characterized by a cover that is adapted for being sealingly emplaced about the rocker arm and having a plurality of oil inlet apertures to allow oil to be applied to the rocker arm at its points of contact that need lubrication and having at least one oil drain aperture to allow oil to drain therefrom; and oil reservoir for containing the oil, oil drain conduit between the cover and the reservoir, and oil pump having suction connected with the reservoir and a discharge for pumping the oil for lubricating the rocker arm, an oil conduit connected intermediate the pump and the reservoir and the pump and the cover for conveying oil is appropriate and an oil pump power means for powering the oil pump, the oil pump power means being drivingly connected with the oil pump and

Abstract: An improved oil circulating system for lubricating engine heads of certain HARLEY DAVIDSON motorcycles includes a Y fitting connected to an oil outlet of the crankcase, a first oil tube extending from the fitting to an oil inlet of the rear head of the engine, a second tube extending from the Y connection to an oil inlet of the head of the front cylinder, and a plug for plugging an oil outlet of the head of the rear cylinder. To install the device, the original oil tube leading from the oil outlet of the crankcase to the oil inlet of the head of the rear cylinder is removed, and an oil tube leading from the oil outlet of the head of the rear cylinder to the oil inlet of the head of the front cylinder also is removed.

Abstract: A diesel engine has a first lubrication system, containing conventional engine oil, used to lubricate that section of the engine subjected to excessive wear--the valve train including the cam shaft, valve lifters, rocker arm, valve stems, etc., and a second lubricant system, utilizing diesel fuel, for lubricating the remaining section of the engine--the crankshaft and associated parts, pistons, connecting rods, etc. By being exposed to crankcase blowby exhaust gases, diesel fuel used to lubricate the crankshaft, etc. absorbs pollutants and contaminants contained therein and recirculates these contaminants through the fuel system to be burned and exhausted. By constantly being lubricated with fresh lubricant, wear on these specific parts is reduced. Frequent lubrication changes have been eliminated because the diesel fuel/lubricant is continuously changed and circulated through fuel system.

Abstract: An internal combustion engine having thereon a cylinder head, a valve mechanism consisting of a cam and a valve arm, comprising a rib-type oil received provided on that portion of the inner surface of a head cover which is in opposition to contact portions of the cam and the valve arm with an oil ejection bore provided in the valve arm directed to the rib-type oil receiver.

Abstract: A cylinder head for an automotive type engine has an overhead camshaft and oil collecting basins adjacent the tappet guides to collect excess oil exuded from the guides; the basins have holes aligned with the cams on the camshaft to drip oil thereon for proper camshaft lubrication; inserts may be used in the oil drip holes, or specially formed drip edges adjacent the holes may be used.

Abstract: An improved oiling apparatus for the camshaft lobes of an engine. The bearing portion of the camshaft is supported within a bore between an upper bearing cap member and a lower cylinder head member. Oil passage means extend from a source of pressurized oil through the upper and lower members and intersect or open to the bore at circumferentially spaced locations. The passage openings are interconnected during a portion of the camshaft rotation by a closed-ended groove in the camshaft bearing portion. A small opening or orifice in the cap member communicates with the oil passage and its axis is orientated slightly from normal to the surface of the cap member so as to direct a fine stream of oil onto an active surface of the nearby camshaft lobe. The small hole or orifice opening is drilled through the cap member from a recessed surface established substantially flat and normal to the intended axis of the orifice opening.

Abstract: A casing for the lubrication of a camshaft of an internal combustion engine for automotive vehicles is partially filled with lubricating oil to effect splash lubrication of cams carried by the camshaft and has at least one lateral overflow port to maintain the oil at a substantially constant level. The overflow port is configured so as to prevent removal of oil which is not in excess of the required amount as a result of the shifting of the oil due to a uphill or downhill inclination of the vehicle. According to a preferred embodiment, the overflow port has a horizontal lower wall which corresponds to the desired maximum level of oil when the vehicle is level and this lower wall is flanked by inclined walls which correspond to the desired maximum level when the vehicle is in uphill and downhill orientations, respectively.

Abstract: A lubricant seal is provided for use in the lubrication of rotating or reciprocating members which are subject to very severe ambient conditions, such as the stems of inlet or exhaust valves of internal combustion engines. The lubricant seal comprises a tubular member of elastomeric material having a first portion surrounding the movable member and a second portion that fits tightly on a bushing guiding the movable member. The first and second portions are connected by a flexible bellows element which compensates any misalignment between the movable member and the bushing. A metering ring made of a self-lubricating material is anchored in the first portion of the tubular member and has a bore closely fitting the periphery of the movable member.

Abstract: The invention relates to a device for lubricating the guiding system of an internal combustion engine valve having at least one valve stem mounted in a guide. A first upper cavity communicates permanently with a second lower annular cavity through a conduit. The first cavity is selectively interconnected to a lubricant intake duct through a sliding valve comprising an annular groove on the valve stem. A third cavity between the intake duct and the slide valve provides lubrication of the upper portion of the valve guide.

Abstract: A supercharged Diesel engine comprises a valve whose stem is slidably received in a valve guide, the end of the valve stem co-operating with actuating means located in a casing and lubricated by oil splash. At least one cavity is formed in the inner wall of the valve guide in close proximity to the end of the valve guide closest to the valve disk and communicates permanently with atmospheric pressure or a pressure close to atmospheric pressure. The cavity communicates with atmospheric pressure or with a pressure in the neighborhood of atmospheric pressure or by at least one axial passage formed on the outside of the valve guide and is permanently fed with lubricating oil.

Abstract: Apparatus for removing the excess lubricant from a rotatably mounted cylindrical valve member for internal combustion engines, pumps and compressors includes a rigid scraper blade mounted within a housing and resiliently biased toward the surface of the cylindrical valve member. The lubricant is supplied copiously to the surface of the cylindrical member at one position and is removed as the cylindrical member rotates at a second position by the rigid blade which has an extremely small degree of flexibility so that it is deformed by an amount not greater than 1/3000 of the diameter of the cylindrical valve member when the blade and a recess in the cylindrical valve member are in register.