Abstract: The invention concerns a device for the angular adjustment of a camshaft relative to the crankshaft of an internal combustion engine, particularly a vane-type adjuster (1) comprising a stator (12) that is driven by the crankshaft preferably through a traction element and a drive pinion (11), and a vane rotor (18) that can be pressurized by pressure oil and is rotationally fixed to the camshaft while possessing a means, preferably an axially displaceable fixing pin (37) for effecting a releasable, rotational fixing of the vane rotor. The drawback of oil leakage in common vane-type adjusters is avoided by the fact that all components of the vane-type adjuster (1) that have contact with pressure oil are arranged in an oil-tight housing (2).

Abstract: A device for varying the opening and closing times of gas exchange valves of an internal combustion engine, comprising a drive unit (2) which is in driving relationship with a crankshaft through a traction element and a driven unit (14) connected to an intake or exhaust camshaft, there being arranged within the device (1), a coupling element (18) by which a rotationally fixed, force-transmitting connection can be established between the drive unit (2) and the driven unit (14) when the pressure of the hydraulic medium falls below a level required for the displacement of the adjusting piston (9), the coupling element (18) being configured as a locking piston (19) which can be displaced on the one hand by hydraulic pressure and on the other hand by an auxiliary energy and comprises on an end face (26) a number of concentrically arranged extensions (27) which are associated to complementary recesses (35) of a locking ring (34) in the housing (6) to avoid noise generation on starting of the internal combustion eng

Abstract: In a device (1) for varying the opening and closing times of gas exchange valves of an internal combustion engine, an undesired start rattling occurring during the starting operation of the internal combustion engine due to an abutment of an adjusting piston (7) against its end position is to be prevented. For this purpose, the invention provides a coupling means (21) which connects a drive unit (4) and a driven unit (11) during the starting operation of the internal combustion engine.

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 device for the continuous variation of a relative angular position between a crankshaft and a camshaft of an internal combustion engine comprising a drive element (2) driven by the crankshaft of the internal combustion engine through a traction means, a sliding sleeve (7) which is positively locked by a first gearing (8, 9) to the drive element (2) and by a second gearing (10, 11) to a driven element (13), and an adjusting piston (6) which is fixed on the sliding sleeve (7) and guided in a housing (3) to axially delimit two pressure chambers (14, 15) which are sealed from each other by a sealing arrangement whereby a radially inward oriented sealing of the sliding sleeve (7), is achieved by providing a sealing disc (17) of continuous configuration which bears against an inner wall (19) of the sliding sleeve (7).

Abstract: A device for the continuous variation of a relative angular position between a crankshaft and a camshaft of an internal combustion engine comprising a drive element (2) driven by the crankshaft of the internal combustion engine through a traction means, a sliding sleeve (7) which is positively locked by a first gearing (8, 9) to the drive element (2) and by a second gearing (10, 11) to a driven element (13), and an adjusting piston (6) which is fixed on the sliding sleeve (7) and guided in a housing (3) to axially delimit two pressure chambers (14, 15) which are sealed from each other by a sealing arrangement whereby a radially inward oriented sealing of the sliding sleeve (7), is achieved by providing a sealing disc (17) of continuous configuration which bears against an inner wall (19) of the sliding sleeve (7).

Abstract: A tensioning device for belts, chains and the like, particularly for the camshaft drive of an internal combustion engine, the device comprising a tension pulley mounted on a movable carrier and a control element by which, when heating occurs, the carrier can be moved by an actuating member in the slackening direction of the belt against the action of a pressure spring, the control element comprising a hollow cylindrical sleeve and a pressure piston arranged therein for longitudinal displacement on whose part lying outside the sleeve a pressure member with a slanting contact surface forming an acute angle with the piston axis is fitted, the contact surface being in contact with a corresponding contact surface of the carrier of the tension pulley for increasing the working reliability of the control element so that automatic adjustment of a defined belt pretension is effected during operation.

Abstract: A tensioning device for belts, chains and the like particularly for the camshaft drive of an internal combustion engine, with a tension pulley supported on a movable carrier, with a control element, by which in the case of heating, the carrier can be moved via an actuating element against the action of a pressure spring in the slackening direction of the belt characterized in that, the control element consists of a hollow cylindrical sleeve closed at the one end by a bottom and on the other end has a flange extending radially inwards, against which from the inside a washer abuts, which in its center receives a longitudinally movable and sealed pressure piston, in the annular hollow space between the bore of the sleeve and the pressure piston, the pressure spring is arranged whereby it is supported on one hand on the washer and on the other hand on the pressure piston, between the bottom and the pressure piston, whose end face is at a distance from the bottom, a further pressure spring is arranged which with l

Abstract: A tensioning device for belts, chains and similar components especially for the camshaft drive of an internal combustion engine comprising a tension roller mounted on a movable support and a control element by which the support can be moved by an actuating mechanism in the relaxing direction of the belt against the action of a pressure spring when the control element gets heated, characterized in that the control element has a cavity for receiving a pressure liquid whose volume varies as a function of the temperature, the cavity being closed by a membrane connected to the actuating mechanism which operates dependably for long periods of time.

Abstract: A chain tightener with a dampening piston guided in a housing and axially acted upon by a spring in the chain tightening direction, and a radially resilient stop ring which cooperates with recesses of the housing and the dampening piston and limits its stroke while allowing a return movement of the dampening direction opposite to the chain tightening direction, wherein the housing (1) has a receiving groove (10) and the dampening piston (3) has an insert edge (25) for the stop ring (26) wherein during sliding of the dampening piston (3) into the housing (1) the insert edge (25) shifts the stop ring (26) until the latter radially snaps into the receiving groove (10), that a locking groove (18) for the stop ring (26) is provided at the dampening piston (3) which is defined on the one hand by a stop end face (19) and on the other hand by a stop ramp (20) wherein the stop ramp (20) fits under the stop ring (26) snapped in the receiving groove (10), that the stop end face (19) shifts the stop ring (26) under the a

Abstract: A mechanical-hydraulic actuating element for a belt tightener especially for internal combustion engines comprising a piston (11) guided in a cylinder (10) between which a spring (14) acts so that piston (11) and cylinder (10) are urged apart wherein a pressure space (19) as defined by piston (11) and cylinder (10) is separated from an oil reservoir (16) by a check valve (20) which allows the free oil passsage from the oil reservoir (16) into the pressure space (19) while the annular gap between piston (11) and cylinder (10) is dimensioned so that oil can flow under pressure which counteracts the force of the spring (14) from the pressure space (19) into the oil reservoir (16) through the annular gap, characterized in that the oil reservoir (16) is designed as a circular ring-shaped hollow space which surrounds the cylinder (10) and is defined toward the outside by a hollow cylindrical cup-shaped housing (15) which is sealed at its open end by an elastic bellows seal (29) attached to the housing (15), on the

Abstract: A self-adjusting hydraulic valve tappet arranged in a guide bore of a cylinder head of an internal combustion engine and being contacted at one end face of the valve tappet by a cam and bearing with a second end face against the end of a valve stem, the tappet comprising a cup-shaped housing comprised of a hollow cylindrical wall closed at one end by an end member against the outside of which the cam abuts and a cylindrical guide sleeve concentric with the cylindrical wall and surrounded by an external oil reservoir and in which the play compensating element is guided for longitudinal movement and abuts at its end against the valve stem characterized in that the valve tappet is comprised of three main structural elements of(a) the outer metallic cup-shaped housing (1)(b) a polymeric inner element (4,31,32) accommodated therein defining the guide sleeve and forming the external oil reservoir (17) together with the cup-shaped housing (1) and(c) the self-adjusting play compensating element (7) guided for longitu

Abstract: In a chain tightener with a dampening piston guided in a housing and axially acted upon by a spring in the chain tightening direction wherein the dampening piston is retainable by a mounting ring within the housing in a blocking position which is released through axial pressure in the direction opposite to the chain tightening direction, the inprovement comprising the mounting ring (30) snaps into a groove (29) which is located at the forward end of the dampening piston (3) and is provided with a bevelled surface (28) and an adjacent latch surface (27), and that the mounting ring (30) is shiftable onto the latch surface (27) via the bevelled surface (28) with a tool insertable in a gap (31) between the housing (1) and the dampening piston (3) wherein the mounting ring (30) engages in a notch (13) of the housing (1) thereby blocking a movement of the dampening piston (3) relative to the housing (1).

Abstract: A self-adjusting hydraulic valve tappet arranged in a guide bore of a cylinder head of an ice being located between a cam of a cam shaft and an end of a valve stem, the tappet comprising a cup shaped housing (1) closed at one end by an end member (3) against the outside of which the cam abuts and a cylindrical guide sleeve (6) concentric with a cylindrical wall (2) and arranged at its end away from member (3) in the center of an annular flange element (5) which at its outer circumference merges into the cylindrical wall (2) of the housing (1) and guide sleeve (6) is spaced at an opposite end from end member (3), a self-adjusting hydraulic play compensating element (10) being guided for longitudinal movement in the guide sleeve (6) comprising an inner piston (12) and an outer piston (11), the two pistons telescoping and defining oil pressure chamber (22) which communicates through a bore in the inner piston (12) closed by a check valve (21) with a central oil reservoir (13) disposed in inner piston (12), the o

Abstract: A thin-walled race for a radical ball bearing and a thin-walled race sheave for an axial ball bearing as well as ball bearings containing said races or thrust washers and a method for producing said races and thrust washers and apparatus for the production of said races and thrust washers and assembly of said bearings.