Abstract: A valve timing control apparatus, includes a drive wheel in driving relation with the crankshaft and has a hollow space with at least one hydraulic working chamber demarcated by two boundary walls extending inwardly from an inner wall surface of the drive wheel. Mounted in fixed rotative engagement with the camshaft and fitted in the hollow space of the drive wheel is a rotatable impeller having at least one vane to subdivide the working chamber in two hydraulic pressure compartments. A seal, positioned between a free end face of the vane of the impeller and the inner wall surface of the drive wheel, fluidly seals the pressure compartments from one another and is formed by a roller-type sealing member spring-mounted in radial direction in an axial groove of the vane.

Abstract: The invention relates to a hydraulic camshaft adjustment device of rotary piston type, which consists of a driving wheel in drive Connection with a crankshaft and of an impeller which is torsionally connected to a camshaft. The driving wheel has a hollow space formed by a peripheral wall and two side walls, at least one hydraulic working space being formed, in this hollow space by at least two boundary walls. The impeller has at least one radial vane (13) and with each vane (13), subdivides a hydraulic working space into two hydraulic pressure chambers. In this arrangement, the outer end surface of each vane (13) of the impeller is in sealing con tact with the peripheral wall of the driving wheel by means of a spring element.

Abstract: Apparatus for adjusting the basic position of a camshaft adjustment unit of an internal combustion engine, includes a first structure secured to a crankshaft and a second structure secured to a camshaft and having a camshaft-distant end surface formed with one or more form-fitting and/or force-locking force-transmitting elements. A piston reciprocates between two end positions and is so operatively connected with the first and second structures that a displacement of the piston results in a rotation of the first and second structures relative to one another. In order to position the adjustment unit in the basic position and to prevent the adjustment unit from executing a rotation relative to the camshaft after occupying the basic position, a tool is attachable to the adjustment unit which tool is formed with counterelements which complement the force-transmitting elements to effect a non-rotatable connection between the tool and the adjustment unit.

Abstract: Apparatus for adjusting a rotational relation between a camshaft and a timing pulley of an internal combustion engine of a type having a crankshaft for driving the timing pulley and a cylinder head for rotatably supporting the camshaft, includes a housing receiving a double-acting piston for displacement in an axial direction between two axially spaced end positions and defining with the housing two pressure compartments. Secured to the piston is a control bushing which is geared to the timing pulley via a first gearing and operatively connected to the camshaft via a second gearing.

Abstract: A valve timing control device (1) for varying opening and closing times of gas exchange valves of an internal combustion engine, characterized in that, in at least one of the pressure chambers (5, 6), there is arranged at least one spring means (13) whose spring force acts on the adjusting piston (4) to counteract an undesired adjusting direction (delayed opening and closing times t.sub.N+) of the adjusting piston (4) caused by a drag and frictional torque M.sub.S of the camshaft (2) during operation of the internal combustion engine, whereby the drag and frictional torque M.sub.S in a low-speed, low-load range of the internal combustion engine is substantially counteracted by an oppositely directed torque M.sub.F obtained from the spring force of the spring means (13).

Abstract: A device (1) for adjusting valve timing in an internal combustion engine, disposed within a control gear of at least one camshaft on a drive pinion (3) which is in driving relationship with this camshaft, said device (1) comprising an adjusting piston (2) which is axially displaceable by a hydraulic medium and whose first and second end faces (11,12) delimit a first and a second pressure chambers (13,14) while a peripheral surface (15) of the adjusting piston (2) bears sealingly against a housing (16) which delimits the first and the second pressure chambers (13,14) radially outwards, the adjusting piston (2) comprising two oppositely oriented helical gear sections, (6,7) and first (6) of said two helical gear sections cooperates with a corresponding gear (5) of a driving element (4) connected to the drive pinion (3), while second (7) of said two helical gear sections cooperates with a gear (8) of a driven element (9) connected to the camshaft, a stop element (18,19) or an end portion of the housing being arr

Abstract: The invention concerns a device for continuous angular adjustment between at least two shafts, a crankshaft and a camshaft of an internal combustion engine, in driving relationship particularly, comprising an adjusting element (4) which is connected to a shaft to be adjusted while being arranged in an axial direction thereto and comprising a hydraulically actuatable piston (14) which is connected to a pressure medium circuit, characterized in that an end region of the shaft to be adjusted, which can be the camshaft (5) or an intermediate shaft, is surrounded by a fixed connecting plate (8a,8b) which comprises pressure medium ducts (6,7) for pressure medium supply to the adjusting element (4).

Abstract: A device (3) for adjusting valve timing in an internal combustion engine, disposed on a drive pinion (4) within a control gear of at least one camshaft (2) mounted in a cylinder head (1), which drive pinion (4) is in driving relationship with said camshaft (2), said device (3) comprising an adjusting piston (5) axially displaceable by a hydraulic medium and having two oppositely oriented helical gear sections (6,9), and first of said two helical gear sections (6) cooperates with a corresponding gear (7) of a driving element (8) connected to the drive pinion (4), while second of said two helical gear sections (9) cooperates with a gear (10) of a driven element (11) connected to the camshaft (2), an end region of the camshaft (2) facing the device (3) being circumferentially surrounded by a connecting bracket (14) positioned, as seen in camshaft direction, behind the device (3) and comprising at least one pressure medium connection (19) for hydraulic medium supply to the adjusting piston (5) characterized in th

Abstract: A device for angular adjustment between at least two shafts, a crankshaft and a cam shaft, in driving relationship in an internal combustion engine, comprising an adjusting element arranged in a region of a cylinder head and connected to the camshaft while being arranged in an axial direction thereof, the adjusting element comprising a piston which is displaceable between two substantially circular ring-shaped pressure chambers which are connected to a source of pressure medium, characterized in that a separate oil distributing element (16) is rigidly integrated in a cap (27) of the adjusting element (3) arranged at a front end of the camshaft (5) and said oil distributing element (16) comprises ducts (6,7) for pressure medium supply oriented towards the piston (14) which comprises two piston areas of identical dimensions.

Abstract: A pre-adjustable, spring-loadable tensioner for belts or chains, in particular for a control gear of an internal combustion engine, comprising a tension roller (2) mounted on a tension roller support (3) of eccentric configuration which in turn is guided on an eccentric inner component which can be screwed onto a housing (20), the tensioner (1) further comprising a spring (12, 29) resiliently urging the tension roller support (3) against the housing (20), characterized in that the inner component comprises a flanged eccentric bush (5) which engages freely rotatable into a base plate (7) which is guided by a radial guide arm (9) on the housing (20).

Abstract: A friction device, in particular for belt tensioners for driving auxiliary units of internal combustion engines, comprising a housing (1), a pressure disk (17, 20, 21) and arranged therebetween, a friction disk (19), the pressure disk (17, 20, 21) and the friction disk (19) being rotatable with respect to each other and an axial force acting between the pressure disk (17, 20, 21) and the housing (1) via the friction disk (19), characterized in that at least one end face of the friction disk (19) is in contact with a protruding (convex) support surface (22, 23) extending towards it.