The oil filter device is disposed on a side portion of one side of a cylinder body in a width direction in a cylinder head side with respect to an engine case in a space between center lines of main lubricating oil passages and a cylinder axis line of the cylinder body, and includes an oil pump disposed on the engine case and further lubricating oil passages that connect to the main lubricating oil passage.

An engine variable camshaft timing phaser (10) includes a sprocket (12), three ring gears (26, 28, 30), multiple planet gears (24), and a sun gear (22). The sprocket (12) receives rotational drive input from an engine crankshaft. One or more of the three ring gear(s) (26, 28, 30) receives rotational drive input from the sprocket (12) and rotates with the sprocket (12), and the remaining ring gear(s) (26, 28, 30) transmit rotational drive output to an engine camshaft (62). All three of the ring gears (26, 28, 30) engage with the planet gears (24). And the sun gear (22) also engages with the planet gears (24). In operation, relative rotational speeds between the sprocket (12) and the sun gear (22) causes the engine camshaft (62) to advance or retard engine valve opening and closing.

A piston engine described allows identical cylinder heads rather than requiring mirror image left and right heads. The engine has front and rear sides, with engine block containing two opposing cylinder banks. Identical heads mounted on block, with overhead camshaft structures in each head. Crankshaft between banks has front and rear gears. At rear is reverse-rotation gear mechanism with internal and external gears. External gear engages crankshaft's rear gear. First chain connects reverse-rotation internal gear to first camshaft sprocket on one head at rear. Second chain connects crankshaft's front gear to second camshaft sprocket on other head at front. Allows driving overhead camshafts of identical heads rather than requiring left and right mirror image heads.

A valve assembly selectively varies the timing of the valves in an internal combustion engine cycle by way of a first and second camshaft. Each valve has a shuttle portion and a valve portion. Upper and lower cam followers on the shuttle portion engage with first and second cams on each of the first and second camshafts to move the valve between an open and closed position with reference to a valve seat on an engine block.

A tubular roller valve for an internal combustion engine, which includes a hollow tube having at least one hole, the at least one hole being configured to access an air inlet or an exhaust of a cylinder in an engine block, a tubular outer insulator outside of the hollow tube, the outer insulator being fixed to a cylinder head, and a tubular inner insulator inside of the hollow tube. An additional tube between the hollow tube and the outer insulator can serve to operate as a compression release brake.

A system including a phaser with a first lock pin and a second lock pin in the rotor assembly. The first and second locks pins having a locked position where they engage a recess in the housing assembly and an unlocked position in which they do not engage the housing assembly. The first lock pin locks the rotor assembly to the housing assembly when the phaser is in an intermediate phase angle position. The second lock pin locks the rotor assembly to the housing assembly when the phaser is at a full retard position. The control valve includes a recirculation check valve and an inlet check valve.

Methods and systems are described for an engine with a cam torque actuated variable cam timing phaser. Phaser positioning control is improved by reducing inaccuracies resulting from inadvertent spool valve and/or phaser movement when the spool valve is commanded between regions. In addition, improved spool valve mapping is used to render phaser commands more consistent and robust.

An output element (1) of a camshaft adjuster (8) is described, in which the output element (1) has a contact surface (2) for rotatably fixed connection to a camshaft; the contact surface (2) has at least one outlet port (3) of an oil channel (4) of the output element (1), which may be situated opposite an outlet port of an oil channel of the camshaft in order to conduct hydraulic medium from the camshaft into the output element (1); the contact surface (2) has a structuring (6) in order to increase the torque transmission between the output element (1) and the camshaft; this structuring (6) is structure-free in the area (5) around the outlet port (3) and this area (5) is designed for sealing the outlet port (3) with respect to the surrounding environment.

The present invention discloses an adjustable cam driving mechanism which comprises a support frame, an input gear, an intermediate gear and an output gear. The input gear, the intermediate gear and the output gear are respectively arranged on the support frame. The intermediate gear is adjustably fixed on the support frame. The input gear and/or the output gear are/is adjustably fixed on the support frame. The adjustable cam driving mechanism of the present invention can adapt to engines of different displacement volumes.

Methods and systems are described for an engine with a cam torque actuated variable cam timing phaser. Phaser positioning control is improved by reducing inaccuracies resulting from inadvertent spool valve and/or phaser movement when the spool valve is commanded between regions. In addition, improved spool valve mapping is used to render phaser commands more consistent and robust.