Abstract:
The invention proposes a switching element (1) for a valve train of an internal combustion engine, particularly for valve deactivation, with a simple-to-implement measure for adjusting the coupling lash of its coupling means (8) in a receptacle (6) using two retaining rings (19, 20), one of which is stocked in a variety of thicknesses.
Abstract:
The apparatus of the present invention provides a lash adjuster feed channel for an engine assembly. The engine assembly includes first and second sets of hydraulic lash adjusters responsive to a variation in hydraulic fluid pressure to cause a variation in lift of first and second sets of engine valves respectively operatively connected thereto. The cylinder head defines a first feed passage in fluid communication with the first set of hydraulic lash adjusters, and a second feed passage in fluid communication with the second set of hydraulic lash adjusters. The valve lift of the first set of engine valves is independently variable by controlling the transfer of hydraulic pressure in the first feed passage, and the valve lift of the second set of engine valves is independently variable by controlling the transfer of hydraulic pressure in the second feed passage. A corresponding method is also provided.
Abstract:
A deactivation valve lifter includes a lifter body. The lifter body has a first end configured for engaging a cam of an engine and at least one annular pin chamber. A pin housing includes a pin housing bottom. The pin housing bottom defines at least one pin stop aperture and a radially directed pin bore. A deactivation pin assembly is disposed within the pin bore and includes pin members. The pin housing is concentrically disposed within the lifter body. A portion of each pin member may be disposed within the annular pin chamber to thereby selectively couple and decouple the lifter body to the pin housing. A drain aperture defined by the pin housing bottom extends from the pin bore to an outside surface of the pin housing. A stop pin is disposed in the at least one pin stop aperture for limiting the inward motion of the pin members.
Abstract:
A method for operating an engine in a vehicle, the engine having at least a cylinder, the method comprising generating engine braking torque to stop rotation of the engine in a desired range by opening and closing at least an electrically actuated valve of the cylinder more than once during a cycle of the cylinder.
Abstract:
Disclosed is a unique configuration of a rocker arm per se wherein high stress areas thereof are strengthened and a trunion shaft is rotatively mounted on its push rod end and has a threaded push rod end insertion bore, a unique push rod construction per se wherein the upper end thereof is threaded, the combination of this rocker arm and the push rod wherein the upper end of the push rod is threaded into the insertion bore whereby the sudden, rapid, repeated and severe impact forces of the push rod end against the rocker arm are spread throughout the threaded connection and the rocker arm and are thus greatly diminished for each point of force contact between the push rod and the rocker arm, and further the stated combination mounted on an internal combustion engine.
Abstract:
A method for operating an engine in a vehicle, the engine having at least a cylinder, the method comprising generating engine braking torque to stop rotation of the engine in a desired range by opening and closing at least an electrically actuated valve of the cylinder more than once during a cycle of the cylinder.
Abstract:
A compression-ignition internal combustion engine for aircraft generally comprises a stationary crankshaft, a crankcase adapted to rotate about the stationary crankshaft, and a plurality of cylinders radially extending from the crankcase. Each cylinder includes a piston adapted to reciprocate therein and a connecting rod drivingly coupling the piston to the crankshaft. The engine further comprises a valve assembly for operating an exhaust valve associated with each cylinder and a fuel assembly for supplying fuel to each cylinder. First and second cams mounted on the crankshaft are adapted to operate the valve assembly and fuel assembly in a timed manner as the crankcase rotates about the crankshaft. The engine also includes a propeller synchronizer for adjusting the pitch of a plurality of propellers radially extending from the rotating crankcase.
Abstract:
A guide rail (1, 22) for valve tappets (2) of an internal combustion engine is provided. The guide rail (1, 22) has receptacle spaces (4), which are each used for receiving one of the valve tappets (2) and in which there are flattened sections (6) interacting in a positive-fit connection with key surfaces (7) of the valve tappets (2), such that each of the valve tappets (2) is protected from rotating about its longitudinal axis, with the flattened sections (6) permitting alignment of the valve tappet (2) parallel to the flattened sections (6). Here, the guide rail (1, 22) is formed as a metal carrier (3, 25) and rotational protection elements (8, 9, 23), which are fixed on this carrier, have the flattened sections (6) which also permit alignment of the valve tappet (2) orthogonal to the flattened sections (6), in that each flattened section (6) belonging to one of the receptacle spaces (4) can be displaced relative to the metal carrier (3, 25).
Abstract:
A valve control mechanism is provided for an overhead valve, internal combustion engine having a camshaft moving a pushrod to move a rocker arm that in turn moves the valve. Three aligned rollers are fastened to the end of the pushrod adjacent the rocker arm. The outer two rollers roll along parallel profiled surfaces that control at least the valve lift and ramp. The middle roller rolls along an engaging surface on the rocker to move the rocker arm in a motion determined by the configuration and location of the profiled surfaces and the engaging first and second rollers. The outer rollers rotate in a direction opposite the middle roller.
Abstract:
A four stroke engine has a camshaft driven by a crankshaft. A decompression member is disposed on the camshaft. The decompression member is movable between a decompression position and a non-decompression position. A portion of the decompression member generally places the valve at an open position when the decompression member is placed at the decompression position and releases the valve from the open position when the decompression member is placed at the non-decompression position. A regulating member is disposed on the camshaft. The regulating member regulates the decompression member to prevent movement of decompression member from the decompression position when the regulating member is placed at a first position. The regulating member releases the decompression member from the decompression position when the regulating member is placed at a second position. A bias member is arranged to urge the regulating member toward the first position. The regulating member is movable toward the second position against the urging force of the bias member when a rotational speed of the camshaft exceeds a predefined speed.