Abstract:
A valve driving device for an internal combustion engine including a hydraulic lifter in each rocker arm and a rocker shaft swingably supporting the rocker arms wherein a first oil passage is provided through the internal bore of the rocker shaft for supplying oil to a reservoir of the hydraulic lifter. A second oil passage is formed through a rocker support for supplying oil in the first oil passage, and an air exhaust port is provided for exhausting air intruded into the internal bore of the rocker shaft to outside.
Abstract:
In the valve mechanism of an internal combustion engine of the overhead camshaft type, a camshaft holder mounted on the cylinder head and supporting rocker shafts thereon has two bearing recesses having a generally semicylindrical shape, formed in a side surface remote from the cylinder head for supporting a pair of rocker shafts received therein, and a lubricating oil passage formed therein and communicating a lubricating oil passage formed in the cylinder head with the hollow interior of one of the rocker shafts. The camshaft holder is further formed therein with two communication passages communicating a peripheral groove formed in a bearing surface opening in a side surface facing the cylinder head for supporting the camshaft, respectively, with two annular gaps defined between two bolt-fitting holes and two bolts extending therethrough to fix the rocker shafts and the camshaft holder to the cylinder head. Lubricating oil supplied to the hollow interior of the above one rocker shaft through the lubricating oil passages is delivered to the hollow interior of the other rocker shaft through one of the annular gaps, one of the communication passages, the peripheral groove, the other communication passage and the other annular gap in the mentioned order.
Abstract:
A valve operation changing system of an internal combustion engine comprises first and second cams formed on a camshaft. The first and second cams are different in cam profile from each other. At least one of the cams has a plurality of cam faces which are axially separate from each other. Additionally, a rocker arm is provided with a follower section contactable with the cam face of the first and second cams. The follower section has a plurality of contact faces at least one of which is contactable with the cam face of the first cam when the rocker arm is in a first position, while with the cam face of the second cam when the rocker arm is in a second position, thereby reducing the moving distance of the rocker arm to improve the response in valve timing change of an engine valve.
Abstract:
A rocker arm mechanism is mounted on a rocker shaft via a pair of eccentric bushes, which, when made to rotate in opposite directions, disengage the rocker arm from an associated valve. The device is useful in controlling the number of operating cylinders in a multi-cylinder engine for more efficient fuel consumption.
Abstract:
A method of economizing fuel consumption in operating an internal combustion engine having a group of combustion chambers of preselected numbers is disclosed. The method comprises the steps of consecutively introducing combustible fuel for ignition into each combustion chamber of the group to provide relatively high power availability for relatively high power demand, and of consecutively introducing combustible fuel for ignition into only selected combustion chamber members of the group numbering less than said preselected number to provide relatively low power availability for period of relatively low power demand. An internal combustion engine is also disclosed comprising first and second sets of cylinders having pistons coupled with a common power train. First and second fuel intake mainfolds respectively communicate with the first and second sets of cylinders. First and second sets of intake valves are respectively mounted to the first and second set of cylinders for movement between valve opened and valve closed positions. First and second sets of rocker arms are mounted to move the first and second sets of intake valves respectively between the valve opened and valve closed positions. Cam means are provided for periodically urging the rocker arms to position member valves of the first and second sets of intake valves in the valve open positions. A set of rocker arm stops is mounted for movement into engagement with the first set of rocker arms to maintain them in a valve opened position for selected periods of time.
Abstract:
A variable valve event engine has a plurality of cams with different cam profiles and can vary the operating characteristics of the valve by moving a rocker arm for selectively changing the cams in accordance with changes in the operating conditions of the engine. The engine further includes a spring urging member which causes a certain amount of energy to be retained in a spring for rapidly changing the cams. The engine has a detector for sensing the temperature of the lubricant utilized in a hydraulic member for moving the rocker arm so that the movement of the rocker arm is effected only when the lubricant temperature is higher than a predetermined temperature.
Abstract:
A valve control assembly for internal combustion piston engines whose rocker arm is linked to an attenuator member which member is designed in such a manner that the attennuating effect exerted thereby is decreased as the engine speed is increased so that an optimum opening movement of the valve is obtained for any speed up to maximum speed.