Several embodiments of variable valve timing mechanisms for an internal combustion engine wherein the timing of two valves associated with the same combustion chamber of the engine may be driven at the same time interval and at the same speed from the engine output shaft and both valves may have their timing adjusted simultaneously by a first variable valve timing mechanism and only one of the valves may have its timing adjusted relative to the other valve by a second variable valve timing mechanism to provide a simpler operational control and lower cost assembly.

Variable valve timing mechanism for engine

A four-stroke cycle internal combustion engine in which an oil reservoir for storing lubricating oil is arranged below a crank chamber housing a crankshaft, and oil mist formed in the oil reservoir is supplied to the interior of the crank chamber and to a valve chamber through an oil mist passage for providing fluid communication between the oil reservoir and the valve chamber. The oil mist passage include pre-separation oil mist passage section formed in the crankshaft, and having one end in fluid communication with the oil reservoir and the other end opened on the radial outer-periphery of the crankshaft; a cylindrical centrifugal-separation chamber surrounding the outer-periphery of the crankshaft on which the other end is opened; and a post-separation oil mist passage section extending from the centrifugal-separation chamber in the opposite direction of the rotational direction of the crankshaft and in fluid communication with the valve chamber. The oil mist passage further includes an oil return passage providing fluid communication between the centrifugal-separation chamber and the oil reservoir. The oil return passage extends from the centrifugal-separation chamber in the same direction as the rotational direction of the crankshaft. Oil mist of adequate concentration thereby being supplied into each of the crank chamber and the valve chamber.

Four-stroke cycle internal combustion engine

An improved strengthening or reinforcing member is provided, particularly an automotive vehicle door bar or beam. The bar comprises an air cooled, hot rolled section of high strength alloy steel having a minimum tensile strength of about 150,000 lb/in 2 and a total elongation of at least about 7.5%. In a preferred embodiment the steel comprises about 0.16 to 0.21% carbon, about 1.8 to 2.1% manganese; about 1.2 to 1.4% chromium; about 0.7 to 0.9% silicon; and the balance essentially iron. A clip element may be mounted on the bar to retard or prevent spreading of the flange portions of the section during bending. By securing or fixing the clip element to the section, a substantial improvement in load carrying capability is obtained.

Automotive vehicle door and bar reinforcement

A camshaft drive arrangement for an internal combustion engine including an improved arrangement for adjusting the valve timing during running of the engine. The timing is adjusted by means of a pair of pulleys that are engaged with opposite flights of a timing belt or chain and which are carried by a pivotally supported adjusting lever. The pivotal position of the lever and, according, the valve timing is altered in response to sensed engine conditions.

Valve timing control means for engine

A camshaft driving arrangement for a DOHC engine comprises two pairs of sprockets, each pair being mounted to the adjacent pair of camshafts, and two idler gears rotatably mounted to the cylinder banks, respectively. A timing chain drivingly interconnects the crankshaft and the two idler gears. On the other hand, two camshaft driving chains each interconnect one of the two idler gears and the adjacent two cam sprockets. A front cover is so constructed and arranged as to conceal the two idler gears and the timing chain.

Camshaft driving arrangement for double overhead camshaft engine

A DOHC engine of the V-type has two cylinder heads each detachably secured to a cylinder block A crank shaft on the block drives two intermediate shafts, one on each cylinder head, by means of an endless flexible element An additional flexible endless element is provided in each cylinder head to drive two cam shafts from the intermediate shaft on that cylinder head Each endless flexible element together with its toothed pulleys or sprockets and its timing belt or chain is described as a wrap-around transmission

Valve actuating mechanism for engines

A connecting rod having a pair of spaced apart flanges parallel to a plane defined by a crankshaft axis and a piston pin axis. A web connects the flanges to form a rod portion having an I-shaped cross section. The inner surfaces of the flanges include a lateral rounded projection adjacent to the flange edges to improve bending and stress characteristics.

Connecting rod for internal combustion engine and method of manufacture

PURPOSE: To reduce cost sharply by heating low alloy steel containing specified quantity of C, Si, Mn, V, Al, N and as necessary Cr, Pb, S to ≥1,100°C, then striking, forging, forming and air cooling at a specified rate of cooling. CONSTITUTION: Low alloy steel containing 0.3W0.5 C, 0.3W0.6 Si, 0.6W1.2 Mn, 0.05W0.2 V, 0.02W0.06 Al, 0.008W0.02 N and as necessary <0.3 Gr, <0.3 Pd, <0.13 S by wt% is made a material. This is formed by striking forging and air cooled as it is at a rate of 10W100°C/min and prepared to ferrite + pearlite structure in which fine V carbide and nitride of ≤500Å diameter are separated out. COPYRIGHT: (C)1981,JPO&Japio

Manufacture of nonrefined forged parts for automobile

PURPOSE: To provide high strength and toughness only with primary cooling of forged product without thermal refining of quenching and annealing by adding V, N, and other elements of forging steel. CONSTITUTION: A forging steel composition contains C: 0.30W0.60%, Si: 0.60W 1.20%, Mn: 0.60W1.20%, V: 0.03W0.20%, sol. Al: 0.02W0.06%, N: 0.008W 0.02%, into which, as required, Cr<0.5% and further one or more of S<0.13%, Pb<0.30%, Ca<0.01%, Se<0.10%, Te<0.10%, Bi<0.10% and Ce<0.20% are added as single elements or compounded with Cr. V and N contained in this forging steel causes carbon nitride to precipitate, which acts as nucleuses for ferrite transformation. Thus, steel base becomes fine ferrite pearlite structure to provide a high strength and toughness, as forged, without thermal refining treatment. COPYRIGHT: (C)1980,JPO&Japio

Refining free high strength forging steel

PURPOSE:To improve strength and wear resistance and to produce crank shafts, etc. in a good yield of production in the stage of producing said parts, by combining the selection of compsn. for soft nitriding steel to be used as a material and a specific heat treatment. CONSTITUTION:Steel contg. <0.5% C, <0.5% Cr, <0.2% Al, <0.3% V is used as a material in the stage of producing parts required to have strength and abrasion resistance such as crankshafts, connecting rods, chassis spindles, torsion bars, etc. for automobiles. The above-mentioned parts are made of such steel and are annealed at the temp. of the Ac1 transformation point or below or are slowly cooled or held at an equal temp. after hot forging to deposit part of the V incorporated therein. The parts are further subjected to a soft nitriding treatment to form a hardened layer of 300Hv hardness at 0.02-0.15mm. depth. The crankshafts and other automotive parts having excellent strength and abrasion resistance are produced.

Isao Machida

Papers

Valve actuating mechanism for engines

Connecting rod for internal combustion engine and method of manufacture

Manufacture of nonrefined forged parts for automobile

Refining free high strength forging steel

Production of machine parts