Abstract: A controllable drive (1) suitable for a motor vehicle coolant pump (2) comprises a rotatably mounted shaft (5), a driven member (7) which is rotationally fixedly mounted on the shaft (5), a driving member (9) which is mounted so as to be rotatable relative to the shaft (5), and a coupling region (7/8) which is arranged between the driving and driven members (9, 7) and holds a viscous fluid. At least one first flow path and at least one second flow path connect a fluid reservoir to the coupling region (7/8), and an actuation device (11a, 11b, 12, 13, 14) changes at least one passage opening of at least one flow path. A coupling housing (8, 8a, 8b) is connected to the driving member (9), and the actuator (14) is arranged within the coupling housing (8, 8a, 8b).

Abstract: A regulatable drive for a motor vehicle, in particular for a water pump in a motor vehicle, has a rotatably mounted shaft, on which is located a rotatably mounted drive member and a rotationally fixed driven member. Between the drive member and driven member, a coupling region is defined, which can receive a viscous fluid for selectively coupling the drive member and driven member. The regulatable drive includes at least one first and at least one second flow path, which connect a fluid storage space to the coupling region, and it has a device which can be varied in its position by means of at least one actuator and which varies at least one passage orifice of at least one of the flow paths.

Abstract: The invention relates to a heating device for motor vehicles with an internal combustion engine and a coolant circuit. The heating device (1) comprises a heat-generation compartment (2) with a cooling jacket (6) around which a coolant flows, and a rotor (13) mounted on a drive shaft (9). The cooling jacket (6) is part of a cooling chamber (3) that comprises a coolant inlet (4) and a coolant outlet (5). A pump wheel (17) is disposed in the cooling compartment (3), is driven by the drive shaft (9) and circulates the coolant.

Abstract: A controllable drive (1) suitable for a motor vehicle coolant pump (2) comprises a rotatably mounted shaft (5), a driven member (7) which is rotationally fixedly mounted on the shaft (5), a driving member (9) which is mounted so as to be rotatable relative to the shaft (5), and a coupling region (7/8) which is arranged between the driving and driven members (9, 7) and holds a viscous fluid. At least one first flow path and at least one second flow path connect a fluid reservoir to the coupling region (7/8), and an actuation device (11a, 11b, 12, 13, 14) changes at least one passage opening of at least one flow path. A coupling housing (8, 8a, 8b) is connected to the driving member (9), and the actuator (14) is arranged within the coupling housing (8, 8a, 8b).

Abstract: The invention relates to a heating device for motor vehicles with an internal combustion engine and a coolant circuit. The heating device (1) comprises a heat-generation compartment (2) with a cooling jacket (6) around which a coolant flows, and a rotor (13) mounted to a drive shaft (9). The cooling jacket (6) is part of a cooling chamber (3) that comprises a coolant inlet (4) and a coolant outlet (5). A pump wheel (17) is disposed in the cooling compartment (3), is driven by the drive shaft (9) and circulates the coolant.

Abstract: A regulatable drive for a motor vehicle, in particular for a water pump in a motor vehicle, has a rotatably mounted shaft, on which is located a rotatably mounted drive member and a rotationally fixed driven member. Between the drive member and driven member, a coupling region is defined, which can receive a viscous fluid for selectively coupling the drive member and driven member. The regulatable drive includes at least one first and at least one second flow path, which connect a fluid storage space to the coupling region, and it has a device which can be varied in its position by means of at least one actuator and which varies at least one passage orifice of at least one of the flow paths.

Abstract: The present invention provides silica particles, which include the following physical properties: BET surface area: 100-700 m2/g; DBP absorption: 100-500 g/100 g; tamped density: 100-250 g/l; ALPINE sieve residue>63?: <5%; and particle sizes (cumulative volume distribution): d95<40 ?m; d50<20 ?m; and d5<10 ?m. The present invention also provides a process for producing silica having a narrow particle size distribution, which includes drying a silica suspension in a pulse combustion dryer to produce silica particles having the following particle size distribution (cumulative volume distribution): d5<10 ?m; d50<20 ?m; and d95<40 ?m.

Abstract: The invention relates to a heating device, in particular for motor vehicles, for generating frictional heat by liquid friction with a housing which is arranged in a stationary position and has a working space and a motor-driven rotor in the working space.

Abstract: The invention relates to a heating device, in particular for motor vehicles, for generating frictional heat by liquid friction with a housing which is arranged in a stationary position and has a working space and a motor-driven rotor in the working space.

Abstract: The present invention provides silica particles, which include the following physical properties: BET surface area: 100-700 m2/g; DBP absorption: 100-500 g/100 g; tamped density: 100-250 g/l; ALPINE sieve residue>63&mgr;: <5%; and particle sizes (cumulative volume distribution): d95<40 &mgr;m; d50<20 &mgr;m; and d5<10 &mgr;m. The present invention also provides a process for producing silica having a narrow particle size distribution, which includes drying a silica suspension in a pulse combustion dryer to produce silica particles having the following particle size distribution (cumulative volume distribution): d5<10 &mgr;m; d50<20 &mgr;m; and d95<40 &mgr;m.

Abstract: Fluid friction clutch is disclosed of the type having a primary disk (2) fastened on a driving shaft (3) comprising magnetic material and a driven clutch housing (1) surrounding the primary disk and mounted with a hub (5) on the shaft (3), and with a working chamber (9) formed between primary disk and clutch housing, into which a shear fluid can enter from a reservoir chamber (11) according to the position of a valve plate (15) opening or closing a connecting opening (13) between reservoir chamber and working chamber and having an armature (16) lying in reach of the shaft (3), which can be shifted by magnetic force produced by a stationary electromagnetic coil (24) arranged on the driven end of the shaft (3), wherein the hub (5) of the clutch housing (1) facing the electromagnetic coil (24) is provided with an inserted first conducting ring (21) of magnetic material which is coupled magnetically at one end (22) with the electromagnetic coil (24) and at its other end facing the working chamber (9) adjoins a se

Abstract: In a damper for a steering device of a motor vehicle and more particularly a motor cycle a piston rod is axially movable with respect to the cylinder. The piston rod is provided with a piston inside the cylinder. The piston is provided with axial bores. The axial bores open into valve seat faces of the piston. Valve rings are allocated to the valve seat faces. Helical compression springs are located within the bores. These springs urge the valve rings towards respective opening positions. The valve rings are movable towards respective damping positions in response to the axial movement of the piston rod with respect to the cylinder. The valve rings have valve faces opposite to the respective valve seat faces. The valve faces are provided with projections towards the valve seat faces and with recesses adjacent these projections. So, a restricted fluid communication is obtained in the damping position of the respective valve ring.

Abstract: Normally, fluid friction clutch having cup disks, in order to permit the circulating of clutch fluid in the relatively small cylindrical ring gap between the housing and the cup disk, must be provided with thread-type conveying grooves. According to the invention, these expenditures are avoided in that the cup disk, on its closed side, is provided with a surrounding edge which projects beyond the cylindrical circumferential surface radially toward the outside and which is flush with the front face of the cup disk. Radial grooves preferably lead into this edge and are provided at the front face. The cup disk preferably be combined with axially extending notches in the cylindrical ring surface of the housing and with conical openings by means of which an intense circulation of the coupling fluid is ensured. The clutch is to be used for the drive of fans for vehicle engines.