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 changing the timing of valves in an internal combustion engine which includes a crankshaft-coupled component and a camshaft-coupled component is provided. The camshaft-coupled component is hydraulically rotatable and lockable with respect to the crankshaft-coupled component for relative rotation or hydraulic clamping of the camshaft (5) with respect to the crankshaft. Movement of hydraulic fluid to and from the device proceeds via a hydraulic-fluid adapter on the device's axial side facing away from the camshaft, against which adapter is additionally positioned an impulse-sending wheel for determining the camshaft position.

Abstract: The invention concerns a device for varying valve timing of gas exchange valves of an internal combustion engine, particularly a hydraulic camshaft adjusting device of a rotary piston type, said device comprising a drive pinion (2) connected in driving relationship to a crankshaft of the internal combustion engine and a winged wheel (3) connected rotationally fast to a camshaft of the internal combustion engine. The drive pinion (2) comprises a hollow space formed by a circumferential wall (4) and two side walls (5, 6), at least one hydraulic working chamber (10) being formed in the hollow space by at least two limiting walls (8, 9). The winged wheel (3) comprises at least one radial wing (12), and with each wing (12) it divides one hydraulic working chamber (10) into two hydraulic pressure chambers (13, 14) which, when pressurized by a hydraulic pressure medium effect a pivoting or a fixing of the winged wheel (3) relative to the drive pinion (2).

Abstract: A dual- or multi-layer filter medium for air filtration, having at least one meltblown layer (2, 2a and 5) at least one meltblown layer (2 and 2a) is placed on the inlet side of the filter medium. The meltblown layer has a pore size larger than that of the next following layer or layers.

Abstract: Bearing part (30) for an articulation of a wiper blade (10) at a hook-shaped end (20) of a wiper rod (18) of a windshield wiper, which bearing part (30) can be placed on a bearing pin (28) of the wiper blade (10) with a hub (36) which is open along a portion of its circumference and is introduced into the hook-shaped end (20) and held by the hook-shaped end (20) in assembled state via contact faces (60, 62, 64, 66, 68) and catch means (50, 52, 88, 90, 92), characterized in that an elongated base body (40) has two arms (42, 44) which are arranged diametrically relative to the hub (36) held in the hub (30) so as to be rotatable coaxial to the hub (36) in a holding clip (46) whose side walls (48, 50) project in the longitudinal direction (38) over lateral surfaces of the base body (40) and are connected with one another by at least one crosspiece (50, 52), wherein the arms (42, 44) are constructed in different ways for receiving wiper rods (18) with different hook-shaped ends (20).

Abstract: A device for changing the timing of valves in an internal combustion engine which includes a crankshaft-coupled component and a camshaft-coupled component is provided. The camshaft-coupled component is hydraulically rotatable and lockable with respect to the crankshaft-coupled component for relative rotation or hydraulic clamping of the camshaft (5) with respect to the crankshaft. Movement of hydraulic fluid to and from the device proceeds via a hydraulic-fluid adapter on the device's axial side facing away from the camshaft, against which adapter is additionally positioned an impulse-sending wheel for determining the camshaft position. The hydraulic-fluid adapter includes a diametrically expanded end flange which simultaneously forms the impulse-sending wheel of the device and, together with a washer positioned between the hydraulic-fluid adapter and the camshaft-coupled component that is likewise diametrically enlarged with respect to the hydraulic-fluid adapter, acts as the axial bearing of the camshaft.

Abstract: The invention relates to a locking unit for a device for modifying the timing of charge change valves of an internal combustion engine, especially for a vane-cell control device. Said device (1) comprises a drive wheel (3) presenting a hollow space (8) and connected to a crankshaft of the internal combustion engine in a driving manner. The device also comprises an impeller (9) which has at least one vane (13) and is connected to the camshaft (2) in a non-rotating manner. At least one working chamber (20), which is divided by a vane (13) into two hydraulic pressure chambers (21, 22), is formed by intermediate walls (16) in the hollow space (8) of the drive wheel (3). When the pressure chambers (21, 22) are subjected to pressure by means of a hydraulic pressure medium they cause the impeller (9) to pivot in relation to the drive wheel (3). When there is no pressure in one of the two pressure chambers (21, 22) the impeller (9) and the drive wheel (3) are mechanically coupled to each other.

Abstract: A device for varying the control times of gas-exchange valves of an internal combustion engine, which has between the impeller (8) and the drive wheel (2) an additional angle-limiting device (26) with the aid of which the maximum pivoting angle of the impeller, which is limited per se by the lateral surfaces (15, 16) of the bounding walls (13) in the drive wheel (2), can be reduced with respect to the drive wheel (2) to a smaller pivoting angle.

Abstract: An apparatus (1) for changing the opening and closing times of gas exchange valves of an internal combustion engine has intercommunicating slide and freewheel means (15, 20). By means of these elements (15, 20), immediately upon starting the internal combustion engine, and adjusting piston (7) of the apparatus (1) is moved into its desired starting position and/or held there long enough for the apparatus (1) to be filled sufficiently with hydraulic fluid again. During the hydraulic-fluid-free state, the adjusting piston (7) is at the same time largely prevented from making any undesired oscillations.

Abstract: A sealing arrangement for a direct-controlled cartridge valve in an insertion bore, which valve is arranged in a hydraulic system of a device for varying the valve timing of an internal combustion engine wherein to avoid leakages between the individual annular chambers (20, 21, 22) in the insertion bore (23) resulting from the radial clearance between the annular webs (8, 9, 10) of the cartridge (5) and the bore wall (24) of the insertion bore (23), the annular webs (8, 9, 10) on the outer peripheral surface (6) of the cartridge (5) are made with a smaller diameter than the insertion bore (23) and additionally comprise annular grooves (14, 15, 16) into which annular sealing elements (17, 18, 19) made of a shear-resistant material are inserted, and leakages between the sealing elements (17, 18, 19) and the cartridge (5), as also leakages between the sealing elements (17, 18, 19) and the bore wall (24) of the insertion bore (23) are sealed by a static radial force resulting from the pre-stress of the sealing el

Abstract: A locking device for a device (1) for varying the valve timing of gas exchange valves of an internal combustion engine, said device (1) comprising an element (3) which is attached to a crankshaft of the internal combustion engine and is in driving relationship with the crankshaft through a traction element, said device further comprising an element (4) attached rotationally fast to the camshaft (2), there being arranged between the two said elements (3, 4), at least two pressure chambers (5, 6) connected to a pressure medium supply and a hydraulically actuatable adjusting element (7) through which a connection for transmitting force from the element (3) attached to the crankshaft to the element (4) attached to the camshaft is established, and through which the two said elements (3, 4) can be made to rotate or be fixed relative to each other within an adjusting range.

Abstract: The invention concerns a device for varying the valve timing of gas exchange valves of an internal combustion engine, said device being arranged in the region of the cylinder head (1) of the internal combustion engine on a camshaft (3) and comprising an element (6) which is attached to a crankshaft of the internal combustion engine and is in driving relationship with the crankshaft through a traction element, said device further comprising an element (7) attached rotationally fast to the camshaft (3), both of said elements (6, 7) being adapted to rotate and to be fixed relative to each other between two end positions in response to an adjusting element which is hydraulically actuatable by a solenoid control valve (25).

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 the valve timing of gas exchange valves in an internal combustion engine, includes a driving unit in driving relationship with a crankshaft, a driven unit fixedly secured to an intake camshaft or exhaust camshaft, and an adjusting member operatively connected to the driving unit and the driven unit and capable of reciprocating between two axially spaced end positions by a hydraulic medium. In order to prevent noise emission after ignition of the engine, a coupling member is provided to interact with the driving unit and to move between an idle position in which the coupling member is disengaged from the driving unit and an operative position in which the coupling member interlocks with the driving unit and effects a fixed rotative engagement between the driving unit and the driven unit to lock the adjusting member in place when pressure applied by hydraulic medium drops below a level required for displacing the adjusting member.

Abstract: A device provided on a internal combustion piston engine for changing the rotational relations between at least one camshaft (5) and a crankshaft (6) includes a hydraulic cylinder (4). This hydraulic cylinder (4) is acted upon by a supply unit (7, 14) which displaces gas cushions in the hydraulic cylinder (4) when the internal combustion piston engine is at a standstill and replaces the gas cushions with hydraulic cylinder, especially motor oil.

Abstract: A valve control device for an internal combustion piston engine adjusts positions of rotation of a camshaft relative to a crankshaft. This device comprises a hydraulic cylinder (1) comprising a piston (2) and at least one first feed duct (4). Between the cylinder (1) and a hydraulic pump (8), there is disposed a hydraulic valve arrangement (6) by which a hydraulic connection can be established between the first feed duct (4) and a first outlet duct. To assure a reliable prevention of rattling noises during the starting operation, it is proposed that the first outlet duct (10) open into a fluid reservoir (7) below the level of liquid therein.

Abstract: A device (1) for varying the valve timing in an internal combustion engine having a hydraulically displaceable annular piston (9) comprises a locking piston (15) arranged adjacent to a pressure chamber (14) which is situated in front of the annular piston (9) and to facilitate a displacement of the locking piston (15) in its uncoupling direction by hydraulic medium, a vent passage (27) leads out of a pressure chamber (26) situated axially behind the locking piston (15) for evacuating the air collected in this pressure chamber (26) into the open.

Abstract: A device for varying the opening and closing times of gas exchange valves of an internal combustion engine, comprising a driven unit (2) rotationally fixed to an intake or exhaust camshaft, a drive unit (8) which is in driving relationship with a crankshaft through a traction element, and an adjusting piston (19) axially displaceable within a housing (10) and axially delimits two pressure chambers (22, 23) while being connected to a sliding sleeve (24) which is provided with two oppositely oriented helical gear sections (26, 28) which cooperate with complementary helical gearings (5, 16) on the driven unit (2) and the drive unit (8), said pressure chambers (22, 23) being sealed from each other by a piston sealing ring (21) and a sealing disc (31) arranged between the end faces (6, 17) of the driven unit (2) and the drive unit (8), a second sealing disc (36) being arranged next to the first sealing disc (31), the inner peripheral clearance of the second sealing disc (36) to the hub (3) is smaller than the moun

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 provided on a internal combustion piston engine for changing the rotational relations between at least one camshaft (5) and a crankshaft (6) includes a hydraulic cylinder (4). This hydraulic cylinder (4) is acted upon by a supply unit (7, 14) which displaces gas cushions in the hydraulic cylinder (4) when the internal combustion piston engine is at a standstill and replaces the gas cushions with hydraulic cylinder, especially motor oil.