An electrical submersible well pump assembly (ESP) has a spring brake having helical turns mounted between the shaft and one of the housings. The spring brake allows free rotation of the shaft in a driving direction and stops the shaft from rotating in a reverse direction. The spring brake may have one end be affixed to the housing to rotate in unison in both directions. Alternately, the spring brake may have one end affixed to the shaft for rotation with the shaft. Further, the spring brake could be free of being connected to either the shaft or the housing. A shear member may be mounted between the shaft and the housing to prevent any rotation of the shaft during run-in.

A viscous coupling may include: a housing part and an input body rotatable relative to the housing part that at least partially delimit an interior space; a shaft rotatable relative to the housing part and on which an output body arranged in the interior space may be formed for conjoint rotation with the shaft; a coupling region formed between the output and input bodies and configured to hold a viscous fluid to assure a coupling between the input body and the output body; a holding chamber for collecting coolant leaking from the coolant pump; a housing wall conformed integrally with the housing part and partially delimiting the holding chamber; and an actuator housing and an electric actuator therein by which a degree of the coupling between the input body and the output body may be adjustable. The actuator housing may at least partially cover the holding chamber.

In a water pump, a water reservoir portion into which cooling water leaking from between a bearing portion and a rotating shaft flows via an introduction hole is divided into a first division portion and a second division portion by a gasket. The first division portion and the second division portion communicate with each other through a communication hole formed in the gasket. The second division portion includes a drain hole through which cooling water is discharged to outside.

Pressure booster (1) for boosting the pressure of petroleum fluids, produced water or seawater, comprising a pressure booster (2) with a motor (3), a rotatable motor shaft (4) and a rotatable pump or compressor shaft (5) where 5 the pressure booster in the form of a centrifugal pump (2) or compressor is arranged. The pressure booster further comprises: a hydraulic variable speed drive (6) arranged between the motor and the pressure booster, the hydraulic variable speed drive comprising an impeller (7) and a turbine (8), wherein the impeller of the hydraulic variable speed drive is 10 arranged on the motor shaft and the turbine of the hydraulic variable speed drive is arranged on the pump or compressor shaft, a common driver side fluid (10) for cooling, lubricating, flushing and powering of the hydraulic variable speed drive, and cooling, lubricating and flushing of the motor and bearings, circulated by one of an impeller (9) on the 15 motor shaft, a pump and a hydraulic power unit, a control system (11) for controlling the coupling of the motor shaft to the pump or compressor shaft by the hydraulic variable speed drive, wherein the motor shaft drives the pump or compressor shaft via the hydraulic variable speed drive.

An electrically and mechanically driven automotive accessory including a housing, an electric motor, a pulley, and a pulley assist mechanism. The electric motor comprises a stator assembly that is mounted to the housing and a rotor assembly that is mounted to a shaft. The electric motor creates a primary torque flow path that drives rotation of the rotor assembly relative to the stator assembly. The pulley is rotatable relative to the shaft and the rotor assembly. The pulley assist mechanism includes a plurality of claw-pole structures that are arranged circumferentially about the rotor assembly and an electromagnet that is configured to induce a magnetic field between the claw-pole structures and the pulley, which creates a secondary torque flow path between the pulley and the rotor assembly.

A torque converter stator includes a hub, an outer ring, a plurality of blades, and a plurality of spokes. The hub is disposed about an axis. The blades are disposed radially between the outer ring and the hub. All of the blades are pivotable relative to the hub and outer ring. The spokes are spaced apart from the blades and fixed to the hub and the outer ring to support the outer ring relative to the hub.

A process fluid lubricated pump for conveying a process fluid, includes a common housing, a pump unit arranged in the common housing, a drive unit arranged in the common housing, and a hydrodynamic coupling. The common housing includes a pump inlet and a pump outlet for the process fluid. The pump unit includes at least one impeller configured to convey the process fluid from the pump inlet to the pump outlet, and a pump shaft, on which the impeller is mounted. The drive unit includes a drive shaft configured to drive the pump shaft, and an electric motor configured to rotate the drive shaft about an axial direction. The hydrodynamic coupling is configured to hydrodynamically couple the drive shaft to the pump shaft by a transmission fluid, and is configured to receive the process fluid as the transmission fluid.

A centrifugal pump for conveying a process fluid, includes a pump unit, a drive unit to drive the pump unit, a pump inlet to receive the process fluid, a pump outlet to discharge the process fluid. The pump unit includes an impeller configured to convey the process fluid from the pump inlet to the pump outlet, and a pump shaft, on which the impeller is mounted. The drive unit includes a drive shaft to drive the pump shaft, and an electric motor to rotate the drive shaft about an axial direction. A plurality of bearings is configured to support the pump shaft and the drive shaft, and a hydrodynamic coupling has a casing and is configured to hydrodynamically couple the drive shaft to the pump shaft by a transmission fluid. At least one of the plurality of bearings is arranged in the casing of the hydrodynamic coupling.

A water pump (1) according to the present invention comprises an electromagnetic clutch (60) that switches between a transmission state where a pump pulley (20) and an armature (83) of an armature assy (80) are made to frictionally engage to transmit drive force of the pump pulley (20) to a pump shaft (30) and a cutoff state where frictional engagement of the pump pulley (20) and the armature (83) of the armature assy (80) is released to cut off transmission of drive force from the pump pulley (20) to the pump shaft (30), and a flange member (120) provided on the armature assy (80) to rotate integrally with the pump shaft (30) and is configured such that when in the cutoff state, by magnetic attractive force between a permanent magnet (111) of the pump pulley (20) and a permanent magnet (131) of the flange member (120), the flange member (120) is rotated together with the rotation of the pump pulley (20).

A viscous coupling may include: a housing part and an input body rotatable relative to the housing part that at least partially delimit an interior space; a shaft rotatable relative to the housing part and on which an output body arranged in the interior space may be formed for conjoint rotation with the shaft; a coupling region formed between the output and input bodies and configured to hold a viscous fluid to assure a coupling between the input body and the output body; a holding chamber for collecting coolant leaking from the coolant pump; a housing wall conformed integrally with the housing part and partially delimiting the holding chamber; and an actuator housing and an electric actuator therein by which a degree of the coupling between the input body and the output body may be adjustable. The actuator housing may at least partially cover the holding chamber.