An internal combustion engine includes an engine housing and a valve drive with a camshaft, a phase adjuster operatively connected to the camshaft, and an actuator for actuating the phase adjuster. The phase adjuster and the actuator delimit an interior space. A cover surrounds the phase adjuster. An actuator holder is provided for fastening the actuator to the engine housing, wherein the actuator holder is surrounded by the cover. A sealing element is disposed between the phase adjuster and the actuator holder. The sealing element seals the interior space against liquid discharge. A method for assembling an internal combustion engine is also provided.

A valve opening/closing timing control device includes a driving rotary body rotatable in synchronism with a crankshaft of an internal combustion engine, a driven rotary body rotatable in unison with a cam shaft of the internal combustion engine and rotatable also relative to the driving rotary body within this driving rotary body, a fluid pressure chamber formed by the driving rotary body and the driven rotary body, and a partitioning portion that partitions the fluid pressure chamber into an advance chamber and a retard chamber. The driving rotary body includes an aluminum housing having a pulley that receives a drive force of the crankshaft via a drive belt and a plate attached to at least one face of the housing. Between the housing and the plate, there is provided a gap allowing outflow of fluid.

A camshaft phaser includes an input member and an output member defining an advance chamber and a retard chamber; a valve body having a valve bore which extends along an axis, an annular groove extending radially outward from the valve bore and having a first width in the direction of the axis, and a passage which opens into the annular groove and which extends from the valve bore through the valve body radially outward from the valve bore such that the passage has a second width in the direction of the axis that is greater than the first width of the annular groove. The camshaft phaser also includes a valve spool which moves along the axis within said valve bore, the valve spool having a land which varies a flow area between the valve bore and the annular groove and between the valve bore and the passage.

A check valve assembly (20) and method of assembly can include a hydraulic tensioner (10) having a body (12) defining an inlet fluid passage with an inlet fluid passage port (14a) having a valve seat (14b). The check valve assembly (20) can include a retainer (22) located within the body (12), a valve disk (30) having a sealing surface (32), and a biasing member (34) normally biasing the valve disk (30) toward the inlet fluid passage port (14a). The retainer (22) can define an outlet passage (24). The valve disk (30) and the biasing member (34) can be received within a cavity (26) of the retainer (22). The biasing member (34) can allow reciprocal movement of the valve disk (30) from a closed seated position sealing the inlet fluid passage port (14a) to an open unseated position spaced from the inlet fluid passage port (14a) opening the inlet passage.

An engine comprising an engine body and a nonconductive engine part attached to the engine body which are positively charged. A self-discharge type static eliminator is provided which, if placed on the nonconductive engine part, can lower the amount of carried charge on the wall surface of the nonconductive engine part in a limited range centered about the location of the placement of the static eliminator. The self-discharge type static eliminator is placed on the outer wall surface of the connecting part of the engine part to the engine body to whereby eliminate a static electricity from the engine body.

Provided is a belt cover of an internal combustion engine having ease of attachment and detachment and sealability. A belt cover structure for an internal combustion engine includes an oil pump case OP and a lower cover 9 that cover a timing belt TB, and a side mount bracket 8 that is adjacent to an upper side of the lower cover 9 and is held by a cylinder block CB. Mating surfaces 96c and 86c that are aligned with each other are respectively formed on the lower cover 9 and the side mount bracket 8. A lower seal member 41 is disposed on the mating surface 96c, and the mating surface 86c is configured to cover the mating surface 96c from the outside. The lower cover 9 and the side mount bracket 8 are fixed in a state where the mating surface 86c of the side mount bracket 8 is pressed against the mating surface 96c of the lower cover 9 via the seal member 41.

The present utility model discloses a portable four-stroke engine, comprising: an engine body, a flywheel and an oil storage tank, wherein an air valve distribution chamber and a crank shaft chamber are arranged in the engine; a crank shaft is arranged in the crank shaft chamber, and is connected to the flywheel; the oil storage tank is arranged on the engine body, located above the flywheel, and configured to store lubricating oil; a cam and a rocker arm mechanism are arranged in the air valve distribution chamber; and the cam is configured to drive the rocker arm mechanism. The portable four-stroke engine provided by the present utility model has a small volume and therefore has better operation performance.

An engine includes: a block defining a cylinder bore; a crankshaft mounted for rotation in the block; a piston disposed in the cylinder bore; a connecting rod interconnecting the piston to the crankshaft; and a cylinder head coupled to the block and including: a combustion chamber aligned with the cylinder bore and having an intake opening and an exhaust opening communicating therewith; an intake port; an exhaust port; a rotatable inlet valve barrel disposed between the intake opening and the intake port and having a first diameter; and a rotatable exhaust valve barrel disposed between the exhaust opening and the exhaust port and having a second diameter different from the first diameter.

A camshaft phaser for the adjusting valve timing of a combustion engine includes a stator and a rotor that can rotate relative to the stator. The rotor is connected to one end of the camshaft via an adapter as well as via a sprocket which is fixedly mounted to the stator. The sprocket is slideably mounted about the camshaft with a first guiding section and is slideably mounted about the adapter with a second guiding section.

A camshaft phaser includes an input member and an output member defining an advance chamber and a retard chamber; a valve body having a valve bore which extends along an axis, an annular groove extending radially outward from the valve bore and having a first width in the direction of the axis, and a passage which opens into the annular groove and which extends from the valve bore through the valve body radially outward from the valve bore such that the passage has a second width in the direction of the axis that is greater than the first width of the annular groove. The camshaft phaser also includes a valve spool which moves along the axis within said valve bore, the valve spool having a land which varies a flow area between the valve bore and the annular groove and between the valve bore and the passage.