Abstract: A small-sized vehicle has an oil control valve for a hydraulically-actuated mechanism of an engine, and provides good cooling of the oil control valve. A small-sized vehicle includes a spool valve for adjusting a hydraulic pressure for a hydraulically-actuated mechanism of an engine. The spool valve is disposed sideways of a cylinder portion (cylinder head) such that an axis of the spool valve extends substantially in parallel with an axis of the cylinder portion. Further, the spool valve is disposed at a position that is rearward of a radiator and that falls within a vertical span of the radiator in a vehicle side view.

Abstract: Valve controller for reciprocating piston internal combustion engines with at least two intake and/or exhaust gas-exchange valves for each piston/cylinder unit, wherein the gas-exchange valves are guided by valve stems in a cylinder head (8) of the reciprocating piston internal combustion engine, loaded in a closing direction by valve springs, and can be controlled via a common bridge (10) by an activation device, wherein the bridge (10) is guided over a sliding surface parallel to the movement of the gas-exchange valves, the bridge (10) has at least one hydraulic valve clearance compensation element (14 or 15) that connects to a gas-exchange valve, and a device is provided that prevents rotation of the bridge (10) about the sliding surface.

Abstract: A valve train of an internal combustion engine comprising a tappet and a hollow tappet pushrod that is actuated by said tappet, said tappet pushrod comprising on one end, a first support for an at least indirectly contacting pressure piston of a hydraulic lash adjuster of said tappet that follows a periodic driving element, typically a cam, a second support for a follower member, typically a rocker arm, being arranged on a further end of the tappet pushrod, said first support comprising a passage for hydraulic medium that can be routed out of the pressure piston during operation of the internal combustion engine into an interior of the tappet pushrod, and the second support comprising a passage for the hydraulic medium to the follower member, wherein a one-way valve body is arranged in the interior of the tappet pushrod and extends for free axial displacement between a complementary valve seat facing the first support and a stop for the one-way valve body, typically a disc, facing the second support, which st

Abstract: In one embodiment, the invention comprises a polymer matrix pushrod comprising a composite rod having an annular collar affixed over each end portion of the composite rod and an endcap affixed at each end. The composite rod comprises a thermosetting polymer matrix and reinforcing fibers within the polymer matrix.

Abstract: An engine valve actuator for an internal combustion engine is provided. The actuator includes a housing having an opening. An adjustment member is disposed in the housing and defines a fluid chamber having a chamber wall. A piston is also disposed in the opening. The piston defines a piston chamber and has a pressure surface, a protrusion extending from the pressure surface, and a groove disposed in the pressure surface surrounding the protrusion and in fluid communication with the piston chamber. A fluid passageway is adapted to controllably communicate pressurized fluid to the housing opening. A push rod is operatively engageable with the piston and is adapted to controllably actuate an engine valve of the engine.

Abstract: The present invention is directed to an improved assembly for operating at least one exhaust valve and at least one intake valve in a cylinder in an engine. The assembly includes a rocker shaft, an intake rocker arm pivotally mounted on the rocker shaft for operating at least one intake valve of the engine cylinder, an exhaust rocker arm pivotally mounted on the rocker shaft for operating at least one exhaust valve of the engine cylinder. The improved assembly includes a lash adjusting assembly for adjusting a lash between at least one of the intake rocker arm and the at least one intake valve, and the exhaust rocker arm and the at least one exhaust valve. The improvement further includes a fluid supply assembly for supplying fluid to the lash adjusting assembly to operate the lash adjusting assembly. The improved assembly further includes a control assembly for controlling the operation of the supply assembly in response to predetermined engine operating conditions.

Abstract: An oil-through type push rod for, for instance, internal combustion engines including a metal pipe and a metal end fitting which has an oil hole formed therein and is welded to the end of the metal pipe, the metal pipe being provided with a covering layer of a low-melting-point metal for fixing a welding spatter generated during welding, and such a low-melting-point metal covering layer being disposed on at least an inside wall surface of the metal pipe so as to be near an area where the metal end fitting is welded.

Abstract: A lifter assembly for an internal combustion engine, including an elongate sleeve having an upper radial wall portion provided with oil feed and oil bleed holes through which oil respectively enters and exits the lifter assembly. An elongate, hollow lifter body closed at one end is reciprocatingly disposed within the sleeve, and has a plunger reciprocatingly disposed therein. The plunger has an internal cavity at least partially defining a low pressure oil reservoir which is in at least periodic fluid communication with the oil feed hole. A high pressure oil reservoir is at least partially defined by the plunger and the lifter body closed end, and is in one-way fluid communication with the low pressure oil reservoir. A cap is reciprocatingly disposed within the sleeve and engaged with the plunger. Seals are provided which preclude oil from exiting the lifter assembly through the ends of the sleeve.

Abstract: In a valve train (1) of an internal combustion engine (10), a tappet push rod (2) comprises on its first end (3), a tappet (5) and an uncoupling device (8) made as a single component, and on its second end (4), a hydraulic lash adjuster (15) that acts on a rocker arm. Due to this spatial separation of the lash adjuster (15) from the single component (5, 8), a component (5, 8) is obtained that has a reduced mass and a smaller diameter as well as a relatively simple structure. In addition, the lash adjuster (15) can now be supplied with hydraulic medium directly out of the rocker arm.

Abstract: A plurality of modular camshaft follower assemblies of substantially identical construction and configuration are positively connected to a camshaft supporting structure of an internal combustion engine and adjustable to position a plurality of camshaft following lever arms at a proper timing location relative to a camshaft. Conduits in sealed serial communication with shafts pivotally supporting the camshaft following lever arms of the modular camshaft following assemblies deliver fluid flow from an engine block of the internal combustion engine to the camshaft following lever arms. The plurality of modular camshaft follower assemblies are each mounted on the engine through access openings in a side wall of the engine block.

Abstract: A hydraulic lash adjuster for an engine is provided that includes a resilient seal received over a plunger assembly above a fluid return aperture in the plunger body. The hollow interior of the pushrod which supplies the hydraulic lash adjuster with fluid provides a secondary low pressure fluid cavity which allows the overall length of the hydraulic lash adjuster to be shortened, thus removing mass from the valve train and improving the valve train dynamics. This configuration prevents fluid from escaping the lash adjuster, allowing the lash adjuster to be positioned in the engine over a wider range of operating angles. Supplying fluid from the pushrod also eliminates the need to machine a fluid supply bore into the body of the hydraulic lash adjuster as well as the need to orient the fluid supply bore to a fluid gallery in the engine block.