Abstract:
A number of embodiments of overhead cam internal combustion engines having multiple intake and exhaust valves. The valve actuating mechanism is such that the valves are opened at a non-symmetrical rate so as to minimize the clearance requirements at top dead center and also so as to minimize the overlap between the closing of the exhaust valve and the opening of the intake valve without decreasing volumetric efficiency. A number of embodiments having either direct or rocker arm actuation are disclosed.
Abstract:
An engine which employs a cam follower mechanism to reduce wear and reduce the size of an assembled engine. The cam follower mechanism utilizes guide rails located to reduce side thrust on the valve stem. The engine employs a high speed quill shaft to synchronize independent cam shafts existing in each of a plurality of interconnected engines. The engine is assembled using a single size fastener to provide a uniform stress gradient within the engine. The engines are interconnected utilizing O-ring seals. The engine provides a piston crown utilizing a connecting rod directly connected to the bottom surface of the piston crown. The piston crown is stabilized along the longitudinal cylinder axis by a rail guide. Connecting rods are provided which require less than one hundred eighty degrees (180.degree.) circumference of a crankshaft pin for support so that a plurality of connecting rods can be associated with a single crankshaft pin. A tabbed bearing fits under the plurality of connecting rods to provide lubrication between the connecting rods and the crankshaft pin. Connecting rods are held to the crankshaft pin by a circular retaining ring. The engine provides a separate cylinder head and cylinder which are attached via a circular deformable retaining band to form a metal to metal seal. The engine provides an independent lubrication system in each engine. Coolant or lubricant is provided to each engine in parallel so that the temperature of the coolant entering each engine is the same. A large diameter modular crankshaft is provided.
Abstract:
An improved control device for intake and/or exhaust valves of an internal combustion engine includes a small circumference portion defined in a drive shaft at a location corresponding to that of an annular member which is eccentrically displaced for changing a rotational phase of the cams. According to this a degree of displacement of the annular member may be increased and control the cams, and thereby the engine valves, may be enhanced. Further, the cam lobe of each cam is formed such that side portions thereof are asymmetrical with respect to a center line of the cam for favorably affecting valve opening and closing timings. In addition, an improved lubricating arrangement for enhancing smooth operation and improved engine performance.
Abstract:
An adjustable valve system for an engine (10) includes an axially shiftable camshaft (14) for connection to a source (24) of rotary power The shaft has at least one valve-actuating cam (28) with a lobe profile which varies along the axis of the camshaft (14). The system also includes a positioning mechanism (42) for controlling the axial position of the camshaft in said engine. A plurality of valves (36) control fluid communication with said engine (10). The system further includes a rocket (34) having contact portions which operatively engage the plurality of valves (36), mounting means (46) disposed in the engine for supporting the rocker and a cam follower (32) mounted on the rocker in rolling engagement with the cam (28). Exclusive pivots (46a, 58) are provided which permit the follower (32) and/or the rocker (34) to pivot relative to said engine (10) about two axes (A.sub.1,A.sub.2), one of which is generally parallel to the camshaft (14) and the other of which is generally perpendicular to that shaft so that when the camshaft (14) is rotated, the follower (32) maintains line contact with the cam (28).
Abstract:
A modified camshaft and a modified cam follower control valve overlap and vary intake and exhaust valve opening and closing in a reciprocating piston engine. The camshaft and cam follower are modified to cause the intake valve of a piston cylinder to open at top dead center and close at bottom dead center of the intake stroke of a piston. The exhaust valve is caused to open at bottom dead center and close at top dead center to the exhaust stroke of the piston. The modification of a camshaft includes the shaping and spacing of the cam lobes to achieve, in conjunction with a modified cam follower, a desired duration and initiation of valve opening. The modification of the cam follower includes a novel shaping of the lower portion of a cam follower.
Abstract:
A camshaft (16) is described for operating the primary and secondary inlet or exhaust valves (12) of an internal combustion engine having multiple valves in each cylinder, the camshaft having cams (18a, 18b) of substantially the same cam profile and phase for operating the primary and secondary valves of each cylinder. In accordance with the invention, in order to reduce valve train noise at least the trailing ramps of the cams (18a, 18b) are offset by between 1.degree. and 3.degree. relative to one another.
Abstract:
An electro-rheological valve controller. The invention comprises a generally cylindrical casing holding an electro-rheological fluid; a reciprocating tappet attached at one end of the cylindrical casing, said tappet contacting cam means for thrusting said tappet into said casing toward a reciprocating valve lift member; a plunger member coupled to said tappet, said plunger being perforated to permit the flow of electro-rheological fluid therethrough; a reciprocating valve lift member situated within said casing and separated from said perforated plunger member by a biasing spring and said electro-rheological fluid, said lift member communicating with a valve to be lifted; and electrode means coupled to said perforated member for generating an electric field within said perforated member such that said electro-rheological fluid within said perforated member solidifies, whereby said plunger applies a compressive fluid force against said reciprocating lift member thereby lifting said valve to be lifted. In an alternative embodiment, the unique electrode configurations of the present invention are utilized in a valve controller with a by-pass conduit.
Abstract:
An electro-rheological shock absorber. The invention comprises a generally cylindrical inner casing holding an electro-rheological fluid; a reciprocating arm means attached at one end of the cylindrical casing; a dampening plunger member coupled to said arm and extending into said electro-rheological fluid, said dampening plunger being perforated to permit the flow of electro-rheological fluid therethrough; and electrode means coupled to said perforated member for generating an electric field within said perforated member such that said electro-rheological fluid within said perforated member solidifies, whereby said plunger applies a compressive fluid force against said fluid so as to provide a dampening force. In an alternative embodiment, the unique electrode configuration of the present invention are utilized in a shock absorber having a by-pass conduit.An alternative embodiment utilizes the conventional design of original shock absorbers and employs the shock absorber oil as the working fluid; the conventional flap valves, or other valves, are replaced by electrified self contained electro-rheological control valves, each containing the unique electrode configuration of the present invention, to control the oil flow through valves in the conventional dampening plunger and/or a similar valve located between the working chamber and a reserve/expansion chamber.
Abstract:
An electro-rheological valve controller. The invention comprises a generally cylindrical casing holding an electro-rheological fluid; a reciprocating tappet attached at one end of the cylindrical casing, said tappet contacting cam means for thrusting said tappet into said casing toward a reciprocating valve lift member; a plunger member coupled to said tappet, said plunger being perforated to permit the flow of electro-rheological fluid therethrough; a reciprocating valve lift member situated within said casing and separated from said perforated plunger member by a biasing spring and said elecro-rheological fluid, said lift member communicating with a valve to be lifted; and electrode means coupled to said perforated member for generating an elecric field within said perforated member such that said electro-rheological fluid within said perforated member solidifies, whereby said plunger applies a compressive fluid force against said reciprocatring lift member thereby lifting said valve to be lifted. In an alternative embodiment, the unique electrode configurations of the present invention are utilized in a valve controller with a by-pass conduit.
Abstract:
A method for controlling the working cycle of a four-stroke internal combustion piston engine with supercharging and direct fuel injection into each cylinder and with at least one inlet valve and one exhaust valve for each cylinder. The method involves opening the exhaust valve for a second time during each working cycle, in addition to holding the valve open during the exhaust expulsion stroke. According to the invention the exhaust valve is opened and closed for the second time during the compression stroke, the valve being opened when the piston is located in a first predetermined position at a distance form the lower dead center piston position and being closed when the piston is located in a second predetermined position at a distance from the lower dead center piston position greater than the first predetermined position. The inlet valve is closed during the inlet stroke, so that expansion of the air in the cylinder at full load subsequent to closing the valve is effected to or beneath the pressure in the exhaust system.