Abstract:
A valve actuation system is described containing a collapsible pushrod device for use in a reciprocating piston machine cylinder such as an engine. The collapsible pushrod device replaces a conventional pushrod. The system can include a driver base, plunger, and a deactivation pin assembly. In normal operation, the pins lock the driver base and plunger together thereby providing regular valve motion. Under selected conditions, the pin assembly controller unlocks the driver base from the plunger. Valve lift is reduced or eliminated. When eliminated, the cylinder is deactivated. The system can vary the effective compression ratio between higher for cold starting and other selected operating conditions and lower for warmed-up running, as well as trap additional exhaust residuals to assist starting and light load. This is especially useful for Diesel engines. Various means may be used to unlock the pins including oil pressure, bi-metal spring temperature, or electromagnetic activation.
Abstract:
A valve (1) rotation includes: a first sheet member (21) that extends toward a surrounding of a valve stem (2) under a condition that a rotation action of the first sheet member (21) is suppressed with respect to a cylinder head, and a second sheet member (22, 32) that faces to the first sheet member (21), that is capable of rotating with respect to the first sheet member (21) and is subjected to a load for opening the valve (1); a force conversion structure that converts the load for opening the valve (1) applied to the second sheet member (22, 32) into a rotation force.
Abstract:
A helical torsion valve spring assembly ( 400) includes one or more helical torsion springs (420, 421, 440, 441) mounted within a frame (401 ) and are held in a statically loaded state ( 482, 486) so that installation of a valve spring retainer (515, 516) can be easily performed. The entire helical torsion valve spring assembly ( 400) is installed as a single part onto a cylinder head ( 520) of an engine valvetrain (500).
Abstract:
An exhaust valve arrangement includes a cylinder having a top end, an exhaust conduit connected to the cylinder by an opening in the top end of the cylinder, the opening comprising a valve seat, a valve member comprising a valve stem and a valve head on the valve stem, the valve member being movable between a closed position in which the valve head is received in the valve seat and an open position in which the valve head is spaced from the valve seat, and a resilient member arranged to urge the valve member to a closed position. A piston is mounted relative to the valve stem, the piston being disposed in a second cylinder in flow communication with the exhaust conduit and arranged such that a change in pressure in the exhaust conduit changes a degree of compression of the resilient member.