Abstract:
A variable valve timing and lift system comprises a camshaft having a rotary cam and a valve operating (VO) cam, and a control rod having an integral portion. The integral portion in the form of an eccentric cam supports a rocker arm. The rotary cam is fixed to the camshaft. The VO cam is in contact with a valve lifter for a cylinder valve of an engine. A torsion spring winds about the camshaft to apply a bias to the VO cam. The rocker arm has a first arm cooperating with the rotary cam and a second arm cooperating with a projecting radial lever of the VO cam. Under the action of the torsion spring, the lever of the VO cam is held in engagement with the second arm of the rocker arm and the second arm of the rocker arm is held in engagement with the rotary cam.
Abstract:
In a working 4-cycle engine including a crankcase, a cylinder block inclined with respect to the crankcase, and an oil pan located in a lower portion of the crankcase. An auxiliary oil tank is disposed below the cylinder block in the direction of inclination of the cylinder block. The auxiliary oil tank communicates with the inside of the oil pan and normally assumes a position higher than the level of oil stored in the oil pan. However, when the engine is tilted down in the direction of inclination of the cylinder block, the oil stored in the oil pan flows into and is accumulated in the auxiliary oil tank. Thus, even if the engine is tilted down in the direction of inclination of the cylinder block, the oil stored in the oil pan is prevented from flowing into the cylinder.
Abstract:
A number of embodiments of twin overhead cam shaft reciprocating machines having a plurality of poppet valves. A variable valve timing mechanism is interposed between the cam shafts and respective of the poppet valves for varying their lift and for changing the number of effective poppet valves per cylinder. The lift changing mechanism includes means for shifting at least one rocker arm follower and provides a relatively compact yet highly efficient structure for achieving this purpose.
Abstract:
An outwardly opening valve system for an engine includes an actuator body having a guide bore, a fluid cavity filled with hydraulic fluid that opens to a valve plunger bore, an intensifier plunger bore and a re-supply passageway. A check valve positioned in the re-supply passageway is operable to prevent back flow of hydraulic fluid from the fluid cavity. An outward valve member with a valve face is positioned to reciprocate in the guide bore. An intensifier plunger is slidably positioned in the intensifier plunger bore. A valve plunger is slidably positioned in the valve plunger bore. An over center cam mechanism includes a cam mounted to the actuator body and rotatable about a pivot pin, a push rod with one end in contact with the cam and an other end in contact with the outward valve member, and finally the pivot pin is attached to the valve plunger. A solenoid is mounted on the actuator body and includes a control rod. A computer is in communication with and capable of controlling the solenoid.
Abstract:
A gear 11 on a crankshaft 10 is made to engage with an internal gear 21 having twice the number of teeth of the gear 11, cams 22 are formed on the exterior surface of the internal gear 21, and the cams 22 are connected with valve actuating mechanisms 40 for actuating an exhaust valve 44 and an intake valve 40 to open or close. The gear 11, the internal gear 21, etc. have the function of an oil pump.
Abstract:
An engine unit in which a crank shaft is arranged perpendicularly in its housing in the state of use thereof comprises a housing defining a crank chamber therein, a crank shaft disposed in the crank chamber to be rotatable, a piston-cylinder assembly disposed in the housing, a valve mechanism operatively connected to the piston-cylinder assembly for sucking and discharging air in the cylinder, and a valve moving mechanism for driving the valve mechanism so as to open or close the same. The valve moving mechanism includes a push-rod members, a push-rod cover member covering the push-rod members with a space therebetween. A rocker chamber is disposed in the housing and communicated with the space, and a drain pipe is disposed between a lower portion of the rocker chamber and a lower portion of the crank chamber so as to establish communication therebetween with an inclination in the state of use. An agitation ring is mounted to the crank shaft so as to agitate and splash a lubrication oil in the crank chamber, and the housing is provided with a guide wall structure for guiding the splashed lubrication oil to the valve moving mechanism.
Abstract:
A variable valve timing mechanism for controlling at least one biased valve comprising a guide assembly having a mounting surface and a spaced apart upper guide surface. The guide assembly includes spaced apart longitudinal guides; a closing stop positioned on the mounting surface and a stop surface. An opening stop is positioned on the guide assembly and has a stop surface. A valve activator is movably positioned within the guide assembly and in operable contact with the biased valve. The valve activator has first and second stop surfaces to contact a respective closing stop and opening stop, and includes an angled contact surface. A drive ram is movably positioned within said guide assembly and in contact with the upper guide surface and the valve activator. The drive ram has an angled drive surface positioned for contacting the valve activator and is connected to a drive for imparting reciprocating motion thereto. The drive is synchronized with the operation of the valve.
Abstract:
In a valve-moving apparatus for an internal combustion engine, lever members are integrally formed with rocker shaft parts and arm parts, the lever members are provided with large-diameter parts larger in diameter than support parts, disposed between support parts of the rocker shaft parts supported by support members of the engine and the arm parts; rocker arms driven by cams are rotatably supported on the large-diameter parts; and change-over mechanisms for selectively engaging the large-diameter parts and the rocker arms are disposed in the large-diameter parts, thereby improving rigidity of the large-diameter parts and achieving improved reliability of the change-over mechanisms.
Abstract:
V-type engine has intake and exhaust valves for each cylinder, the intake valve being inclined at an angle relative to a center line of each cylinder bore larger than an angle relative to the center line at which the exhaust valve is inclined, and having a length between an intake valve face and an intake cam longer than a length between an exhaust valve face and an exhaust cam of the exhaust valve.
Abstract:
A lash adjusting system for internal combustion engines which can adjust valve clearances of intake and exhaust valves by only one lash adjuster, in which the lash adjusting system for a combustion engine having a cylinder head and a valve train for opening or closing an intake valve or an exhaust valve including a guide member fixed on the cylinder head and having openings at its both ends; a pair of plungers slidably disposed in the guide member, the plungers applying a force in opposite direction of each other respectively; a pair of levers respectively receiving a force from one of the plungers and making a front end of the rocker arm be in contact with a stem of the intake or exhaust valve; a common chamber for receiving a hydraulic fluid applying a pressure to one of the plungers to maintain a contacting force of the rocker arm and the valve stem; a pair of independent chambers communicated with a hydraulic pressure passage and receiving the hydraulic fluid to supply again the hydraulic fluid exhausted from the common chamber when the valve is lifted; and check ball means disposed between the each independent chamber and the common chamber to supply the hydraulic fluid of the independent chamber for the common chamber.