Abstract: A fluid friction clutch may include a rotatably mounted shaft, a drive disk arranged on the shaft in a rotationally fixed manner, a driven body rotatably arranged on the shaft, and a ring-shaped transfer region disposed between the drive disk and the driven body. The transfer region may be configured to receive a viscous fluid via which the drive disk is couplable to the driven body for transferring a torque. The transfer region may be defined by a ring-shaped first groove profile of the drive disk and a ring-shaped second groove profile of the driven body that engage one another axially. The clutch may also include a storage chamber fluidically connected to the transfer region via an inflow path and via a return path. The return path may include a first retaining body and a second retaining body arranged radially offset relative to one another by an arc angle.

Abstract: Viscous fan drive systems with wiper members positioned on the OD of the clutch disks, and which rotate at high speed. The fluid reservoir also rotates at input speed. The wiper member directs viscous fluid radially back to the fluid reservoir. The valves in the viscous fan drive systems can be activated by a bimetal mechanism.

Abstract: Viscous fan drive systems with wiper members positioned on the OD of the clutch disks, and which rotate at high speed. The fluid reservoir also rotates at input speed. The wiper member directs viscous fluid radially back to the fluid reservoir. The valves in the viscous fan drive systems can be activated by an electromagnetic mechanism.

Abstract: The invention relates to a fluid friction clutch (1) having a housing (2, 3), having a clutch disk (4) which is rotatable relative to the housing (2, 3), and which is rotatably arranged on an end (5) of a shaft (6) which is mounted centrally within the housing (2, 3); having a working chamber (9) between the housing (2, 3) and the clutch disk (4); having a storage chamber (10) for clutch fluid; having a supply duct (11) which leads from the storage chamber (10) to the working chamber (9); having a stationary clutch part (13) relative to which the housing (2, 3) is rotatable; and having a pump element (14), wherein the pump element (14) defines a shear gap (12) with an annular wall (19) arranged in the storage chamber (10), wherein an active element (7) is fastened to the housing (2, 3), and wherein the shear rate in the shear gap (12) can be regulated by means of an electric motor (20) which is mounted on the shaft (6).

Abstract: Provided is an external-control type fan clutch device that can suppress unnecessary rotation of a cooling fan at the time of activating a rotary shaft effectively regardless of stop positions of an oil supply port and an oil recover port at a stop time of the fan. The fan clutch device includes a valve member for opening/closing an oil circulating flow passage hole provided on a side wall face of the annular oil reserving chamber, wherein opening/closing of the oil circulating flow passage hole is controlled by the valve member, wherein an oil supply chamber, that is formed of a partition wall composed of an arc-like wall and a plate-like partition wall for shielding one end of the arc-like partition wall, is provided in the annular oil reserving chamber, and the oil circulating flow passage hole and an oil recovery port are arranged in the oil supply chamber.

Abstract: Viscous fan drive systems with wiper members positioned on the OD of the clutch disks, and which rotate at high speed. The fluid reservoir also rotates at input speed. The wiper member directs viscous fluid radially back to the fluid reservoir. The valves in the viscous fan drive systems can be activated by a bimetal mechanism or an electromagnetic mechanism.

Abstract: Provided is a highly reactive fluid fan coupling device utilizing the non-Newtonian fluid characteristics of oil, thereby obtaining an excellent reaction rate of fan rotation using a control signal. In the fan coupling device, where the interior of a sealed housing supported on a rotary shaft with a drive disk secured thereto is partitioned in an oil reservoir chamber and a torque transmission chamber placing the drive disk thereinto by a partition plate; drive torque is transmitted to a driven side by oil supplied to the torque transmission chamber; and opening and closing of a flow path of oil is controlled by a valve member actuated by an electromagnet, wherein a mechanism to scrape out the oil in the oil reservoir chamber utilizing the non-Newtonian fluid characteristics of oil is provided on the drive disk so as to be opposed to an oil supply adjusting hole of the partition plate.

Abstract: The present invention relates to a fluid accumulator chamber (1) of a fluid clutch device having an inner boundary wall (2) which runs around a central axis of rotation (M), having an outer boundary wall (3) which runs around axis of rotation (M), and having at least one filling opening (4) arranged in the outer boundary wall (3), wherein the outer boundary wall (3) has, at the location of the filling opening (4), a maximum spacing (R1) to the central axis (M), which spacing decreases continuously to a point (P) of minimum spacing (R3) to the central axis (M).

Abstract: Provided is a highly reactive fluid fan coupling device utilizing the non-Newtonian fluid characteristics of oil, thereby obtaining an excellent reaction rate of fan rotation using a control signal. In the fan coupling device, where the interior of a sealed housing supported on a rotary shaft with a drive disk secured thereto is partitioned in an oil reservoir chamber and a torque transmission chamber placing the drive disk thereinto by a partition plate; drive torque is transmitted to a driven side by oil supplied to the torque transmission chamber; and opening and closing of a flow path of oil is controlled by a valve member actuated by an electromagnet, wherein a mechanism to scrape out the oil in the oil reservoir chamber utilizing the non-Newtonian fluid characteristics of oil is provided on the drive disk so as to be opposed to an oil supply adjusting hole of the partition plate.

Abstract: A liquid friction clutch (1) having a housing (2, 3), a clutch disc (4) rotatable relative to the housing (2, 3) and which is rotatably arranged on an end (5) of a shaft (6) which is mounted centrally within the housing (2, 3), which shaft (6) bears on its other end (8) a driveable active element (7). A working chamber (9) is positioned between the housing (2, 3) and the clutch disk (4). A storage chamber (10) is provided for the clutch fluid. A supply duct (11) leads from the storage chamber (10) to the working chamber (9). A stationary clutch part (13) relative to which the housing (2, 3) is rotatable, wherein a rotatably mounted pump element (14) is provided which, with the housing (2, 3), defines a shear gap (12).

Abstract: A viscous friction clutch for driving a cooling fan in a motor vehicle is disclosed, wherein the viscous friction clutch comprises a driving disk and a housing, a supply chamber and a working chamber, a device for supplying shear fluid from the supply chamber to the working chamber and a device for returning the shear fluid from the working chamber to the supply chamber.

Abstract: A centrifugally balanced fluid reservoir comprising a fluid reservoir having a channel therein, a flexible barrier dividing the channel of the fluid reservoir into a first compartment and a second compartment, a first aperture in the first compartment allowing transfer of fluid into and out of the first compartment, and a second aperture in the second compartment allowing transfer of fluid into and out of the second compartment. The first aperture may fluidly connect the first compartment to an external pressure source, and the second aperture may fluidly connect the second compartment to a rotating device. The channel of the fluid reservoir may be toroidal and annular.

Abstract: A viscous friction clutch for driving a cooling fan in a motor vehicle is disclosed, wherein the viscous friction clutch comprises a driving pulley and a housing, a supply chamber and a working chamber, a device for supplying shear fluid from the supply chamber to the working chamber and a device for returning the shear fluid from the working chamber to the supply chamber.

Abstract: A viscous fan drive with a front-mounted fan and electrical actuation without a tethered harness. The mechanical package includes an inverted viscous clutch, a drive pulley, a split electromagnetic actuator with the electrical portion mounted to a stationary mounting member. Enhanced cooling can be provided with breather openings in the pulley, breather slots in the body member, and fins in the reservoir.

Abstract: A fluid friction clutch, in particular for a motor vehicle fan, having a rotatably mounted shaft wherein a reservoir for at least largely holding the fluid is provided radially inside an outer periphery of the drive body, and wherein at least one first flow path and at least one second flow path are provided, which are used to connect the reservoir to the coupling area, and wherein the drive body, at the outer periphery, has at least one flow resistance element which is arranged between the at least first flow path and the at least second flow path, and wherein furthermore there is a controllable device for closing and opening at least one of these flow paths.

Abstract: A fluid clutch includes a first transmission element and a second transmission element which is rotatable about an axis of rotation with respect to the first transmission element. Torque transmission surfaces of the first and the second transmission elements are located opposite one another in a working fluid region in which torque transmission coupling can be made selectively between the first and the second transmission elements by means of fluid. A valve arrangement can be actuated for selectively making and breaking a fluid flow connection between a fluid storage region and the working fluid region, in order respectively to allow and prevent the ingress of fluid from the fluid storage region into the working fluid region and a braking apparatus can generate a braking force acting on the second transmission element. Two components are movable with respect to one another within a limited range of movement by the transmission of braking force to the second transmission element.