An endless band drive system having a variable center distance between the drive pulley and the driven pulley also has a rotatable control shaft and an endless band guide, where the guide is positioned by the rotatable control shaft for maintaining a slackless endless band with change of pulley center distance. Rotation of the control shaft pivots the endless band guide thereby maintaining a slackless endless band with change of the pulley center distance. Preferably, the rotatable control shaft also provides means for adjusting the center distance between the drive pulley and the driven pulley. The present invention provides a slackless endless band system for a variable compression ratio engine having a variable center distance between the drive pulley mounted on the crankshaft and the driven pulley mounted on the camshaft. The system provides slackless operation of the endless band at two or more compression ratio values.

A product for applying tension is disclosed. A block may have a first passage opening into the block. A body may have a first manifold and may be positioned against the block so that the first passage is open to the first manifold. The body may have a flow path for providing fluid from the first manifold to a second manifold and there through to a pressure chamber. The flow path may include a series of channels and may be configured to allow substantially unimpeded flow from the first manifold to the second manifold, and to impede flow from the second manifold to the first manifold. The flow path may be free of movable components.

A product for applying tension is disclosed. A block may have a first passage opening into the block. A body may have a first manifold and may be positioned against the block so that the first passage is open to the first manifold. The body may have a flow path for providing fluid from the first manifold to a second manifold and there through to a pressure chamber. The flow path may include a series of channels and may be configured to allow substantially unimpeded flow from the first manifold to the second manifold, and to impede flow from the second manifold to the first manifold. The flow path may be free of movable components.

A variable camshaft timing system, includes a camshaft phasing mechanism that selectively changes an angular position of an input relative to an output; a first camshaft phaser sprocket, coupled with the input of the camshaft phasing mechanism, configured to engage a first endless loop that communicates rotational force from a crankshaft to the input of the camshaft phasing mechanism; and a second camshaft phaser sprocket, axially spaced from the first camshaft phaser sprocket and coupled with the output of the camshaft phasing mechanism, configured to engage a second endless loop that communicates rotational force from the output of the camshaft phasing mechanism to a camshaft and change the angular position of the camshaft relative to the crankshaft, wherein the camshaft phasing mechanism is mounted about an axis that is different from an axis of camshaft rotation.

A variable camshaft timing system, includes a camshaft phasing mechanism that selectively changes an angular position of an input relative to an output; a first camshaft phaser sprocket, coupled with the input of the camshaft phasing mechanism, configured to engage a first endless loop that communicates rotational force from a crankshaft to the input of the camshaft phasing mechanism; and a second camshaft phaser sprocket, axially spaced from the first camshaft phaser sprocket and coupled with the output of the camshaft phasing mechanism, configured to engage a second endless loop that communicates rotational force from the output of the camshaft phasing mechanism to a camshaft and change the angular position of the camshaft relative to the crankshaft, wherein the camshaft phasing mechanism is mounted about an axis that is different from an axis of camshaft rotation.

A housing is rotatable synchronously with a crankshaft of an engine. A plurality of external teeth arrangements is respectively shaped into a ring form and is formed integrally with the housing in one piece and is configured to mesh with a plurality of chains, respectively, each of which is wound around the crankshaft or a sprocket that is rotatable. A cam plate is connected to a camshaft of the engine and is rotatable relative to the housing. A plurality of stoppers is formed integrally with the housing in one piece while the stoppers are configured to limit relative rotation between the housing and the cam plate within a predetermined range when the stoppers contact the cam plate. Each stopper is placed at a position, at which the stopper does not overlap with any of the external teeth arrangements in a view taken in an axial direction of the housing.

A housing is rotatable synchronously with a crankshaft of an engine. A plurality of external teeth arrangements is respectively shaped into a ring form and is formed integrally with the housing in one piece and is configured to mesh with a plurality of chains, respectively, each of which is wound around the crankshaft or a sprocket that is rotatable. A cam plate is connected to a camshaft of the engine and is rotatable relative to the housing. A plurality of stoppers is formed integrally with the housing in one piece while the stoppers are configured to limit relative rotation between the housing and the cam plate within a predetermined range when the stoppers contact the cam plate. Each stopper is placed at a position, at which the stopper does not overlap with any of the external teeth arrangements in a view taken in an axial direction of the housing.

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.

A cylinder head for a marine engine has an axially elongated camshaft, cam lobes that are axially spaced apart from each other along the camshaft, and valves that control one of a flow of intake air for combustion in the marine engine or a flow of exhaust gas from the marine engine. The cam lobes actuate the valves upon rotation of the camshaft. Each cam lobe comprises first and second cam lobe sections that are axially spaced apart from each other along the camshaft.

A camshaft adjuster (1) for driving and/or adjusting a camshaft (2) of an internal combustion engine, including a stator (3) and a concentric rotor (6) which is arranged within the stator in a rotatable manner. At least the stator (3) has a central receiving area (31) for receiving the camshaft (2), and at least one projection (13) which protrudes radially inwards is provided on a radial inner edge (12) of the central receiving area (31) in order to engage behind a camshaft (2) connecting piece (20) which protrudes radially outwards. A camshaft adjuster/camshaft combination (26) including such a camshaft adjuster (1) and a camshaft (2) which has a connecting piece (20) that projects radially. The projection (13) preferably engages behind the connecting piece (20). A method for assembling the camshaft adjuster/camshaft combination (26) is also provided.