Abstract: A pump comprising a housing having a first cavity and a second cavity, where the first cavity has a first motor and a pump element located therein. The first cavity is also connected to an external gear connected to the outside of the housing for receiving rotation power from a vehicle engine. The second cavity has a second motor that selectively connects to the pump element in the first cavity to provide toque.

Abstract: A clutch subassembly for a supercharger is disclosed. The clutch assembly includes a clutch subassembly housing, the clutch subassembly housing having an input shaft end, a supercharger end and a longitudinal axis. The clutch subassembly also includes a clutch input shaft rotatably disposed within the input shaft end. The clutch subassembly further includes a selectively rotatable clutch assembly disposed in the supercharger end, the clutch assembly comprising a rotating portion that is operably coupled to the clutch input shaft and a selectively rotatable portion that is selectively engageable with the rotating portion through a clutch, the selectively rotatable portion comprising a rotatable hub, the rotatable hub having a shaft engagement feature.

Abstract: An automotive fluidic pump includes a driving device, a pump wheel, a hydraulic coupling configured as a magneto-rheological coupling comprising a rotatable driving clutch element which is permanently connected to the driving device. A rotatable driven clutch element is permanently connected to the pump wheel. A magneto-rheological liquid filling a working gap is arranged between the rotatable driven clutch element and the rotatable driving clutch element. A magnetic unit comprises a permanent magnet and an electromagnet. The permanent magnet and the electromagnet are each configured to magnetically affect the working gap. Each of the driving device and the pump wheel are connectable by the hydraulic coupling. The electromagnet is arranged to compensate a magnetic field created by the permanent magnet in the working gap when the electromagnet is activated.

Abstract: A floor finish applicator including a cart having wheels and a body member constructed and arranged to receive a source of floor finish. The floor finish applicator also includes a pump coupled to the cart and operable to deliver floor finish to a floor, a floor finish feed conduit in fluid communication between the pump and a container supporting floor finish, and a transmission assembly coupled to the cart. The floor finish feed conduit supplies floor finish to the pump. The transmission assembly includes an axle coupled to and driven by a wheel of the cart, a drive gear connected to the axle, a drive shaft having a driven gear for engaging the drive gear and driving the pump, and a hand-actuated spring-loaded clutch for selective engagement of the pump and the drive shaft with the axle.

Abstract: A drive unit is provided. The drive unit forms a power transmitting path that includes a driving shaft between a wheel/tire assembly and a driving power source provided separately for each wheel/tire assembly, and transmits power via the driving shaft. The drive unit has a weak portion, which is less durable than any other portion in the power transmitting path with respect to external force applied to the wheel/tire assembly, formed on the driving shaft.

Abstract: A pump assembly for a vehicle transmission that is coupled to a prime mover, a chain drive assembly, a hydraulic pump with a rotor, and a planetary gear set. A drive sprocket of the chain drive assembly is rotationally coupled with the prime mover. The planetary gear set includes first, second, and third members. The first member is rotatable with the pump and the third member is rotatable with the driven sprocket.

Abstract: A system for changing a pump displacement configuration includes a blender that provides low-pressure fluid to a pump. The pump has a power end and fluid end, where the fluid end includes a number of plungers. The system includes an actuator that couples the power end with a selectable subset of the plungers. The system further includes a controller that selects a subset of the plungers according to a job pumping rate, a job pumping pressure, and/or a fluid end failure event indicator. The controller further commands the actuator to couple the selected subset of the plungers to the power end.

Abstract: A water pump for use in steam cleaning devices includes a plunger pump with check valve and a transmission assembly. The plunger pump with check valve includes a water inlet and a water outlet. The transmission assembly includes a gear transmission system, an eccentric wheel, and a plunger pump push block. The output shaft of the gear transmission system drives rotation of an eccentric wheel. The push block has a reset structure which makes one end of the push block engage the eccentric wheel. The other end of the push block engages a plunger of the plunger pump with check valve. The pump has a simple structural arrangement, requires no additional power source, and provides consistent water flow at a low manufacturing cost.

Abstract: A water pump for a vehicle includes a power transmission member driven and rotated by an external power, a driven shaft driven to be rotatable independently from the power transmission member, an impeller, an arm member which includes a pressing portion pressing the power transmission member and which is contactable to the power transmission member for transmitting a rotation of the power transmission member to the driven shaft, a control member controlling the arm member so that the arm member and the power transmission member come in contact with each other or come out of contact from each other and so that a contact state between the arm member and the power transmission member is variable, and a biasing member biasing the arm member toward the power transmission member.

Abstract: A water pump for a vehicle includes a power transmitting member, a driven shaft rotated independently from the power transmitting member, an impeller, a biasing member for pressing an inner circumferential surface of the power transmitting member and for rotating in order to transmit a rotation of the power transmitting member to the driven shaft when the biasing member contacts the inner circumferential surface, and a control member for allowing the power transmitting member and the biasing member to come in contact with each other or to come out of contact from each other and for controlling a contacting state between the power transmitting member and the biasing member.

Abstract: An automotive air conditioning compressor assembly that includes a compressor capable of exhibiting an over-torque condition, an electromagnetic clutch, and an over-torque protection device located between the compressor and the accessory drive. The over-torque protection device is configured to decouple the compressor and the accessory drive when the over-torque condition occurs. The over-torque protection device uses a frangible part that breaks when an over-torque condition occurs and parts equipped with helical ramps to force the rotor and stator of the clutch apart to disengage the compressor from the vehicle accessory drive.

Abstract: Starter arrangement for high power rotating equipment strings with multiple compressors driven by a single turbine or motor includes multiple variable fluid drive torque converters (CSTCs) to start the compressors in a pressurized start. The string can use a single CSTC for each compressor or a single CSTC for more than one compressor with at least two CSTCs for a given string. The starting procedure is sequential. After the turbine or motor is started and brought up to speed, successive CSTCs are operated from zero to lock-up speed sequentially to start each compressor or group of compressors in turn. In order to cool the working fluid of the CSTCs, a single heat exchanger is provided and the working fluid of each CSTC in turn is circulated through the heat exchanger as they are sequentially started.

Abstract: A supply pump includes a housing, a tappet, a guide groove, and a stopper pin. The housing includes a cylindrical sliding wall. The tappet is configured to be reciprocated along the sliding wall. The guide groove is provided for one of the housing and the tappet. One end of the guide groove includes a tapered surface. The stopper pin is provided for the other one of the housing and the tappet. The stopper pin is fitted into the guide groove to stop rotation of the tappet relative to the housing. When the tappet is displaced abnormally in an upper direction, the tapered surface is pressed on an end of the stopper pin to be engaged with the stopper pin.

Abstract: A compressor system supplies compressed air to a commercial vehicle. The compressor system includes a compressor, a clutch, and a hydraulic pump and can be driven by way of a drivetrain. The compressor can be completely disconnected from a driving engine by way of the clutch. The drivetrain encompasses a geared drive mechanism which allows the hydraulic pump to be driven, and the clutch is arranged between the geared drive mechanism and the compressor. A method for operating the compressor system is provided.

Abstract: The present inventive disclosure is directed generally to an improved automobile air- conditioning system that can be operated while the automobile's engine is not running. In variations, a typical vapor-compression-cycle air-conditioning system is modified to allow the refrigerant compressor to be driven from either of two power sources: (1) from a traditional engine-mounted pulley system, or (2) from a DC-motor powered by an electrical source independent from the engine. In another variation, the air-conditioning system is driven by one or more thermal-electric-cooling (TEC) modules, wherein the TEC-based system is powered by an auxiliary DC-power source that in some variations is powered by, or at least supplemented by, a solar-energy grid.

Abstract: A clutch assembly configured for use with a supercharger having a first shaft having a longitudinal axis; a pulley connected to the first shaft; a clutch rotor mounted connected to the first shaft; a clutch armature mounted to a second shaft and unconnected to the first shaft; and a clutch coil spaced along the longitudinal axis from the pulley. The clutch rotor rotates around the longitudinal axis. The clutch armature also rotates around the longitudinal axis. The design diameter of the pulley is entirely independent of the diameters of the clutch rotor, the clutch armature, and the clutch coil. A supercharger including the clutch assembly is also provided.

Abstract: A latching mechanism for selectively disengaging an upper pump from a motor in an ESP. The latching mechanism comprises barbs formed on an upper end of an upper shaft that are engaged by a tool to lift the upper shaft until a lower end of the upper shaft disengages from an upper end of a motor shaft. When the upper pump is disengaged from the motor shaft, only a lower pump is driven by the motor and flow of well fluid is circulated past the disengaged upper pump via a bypass line. The upper pump shaft may reengage the motor shaft if additional lift is required.

Abstract: A method for winding a coil on an object, wherein the coil includes a plurality of first coils and a plurality of second coils, may have winding the first coils on an exterior circumferences of the second coils, wherein an outer circumferences of the respective second coil is enclosed and in contact with outer circumference of at least three first coils, and wherein cross-sectional area of the second coil is smaller than that of the first coil, and wherein the outer circumference of the at least three first coils are in contact each other.

Abstract: An air-conditioning compressor comprises a shaft rotationally assembled through a casing. A pulley is attached to the compressor by a roller bearing. A torque-transmitting member engages the pulley and the shaft together. Openings are formed between arms of an external torque transmitting part and a bore of an inner ring has a radius such to enable insertion of a crimping tool into the torque-transmitting subassembly to reshape local plastic features for assembly of the torque-transmitting subassembly. The local plastic deformations of the casing interfere with a transverse face of the inner ring, wherein the local plastic deformations are positioned in axial alignment with the empty spaces in at least one relative angular position between the torque-transmitting member and the inner ring.

Abstract: A rotary vacuum pump comprises, between the rotor (2) and a driving motor, a control unit (1; 101) for operatively connecting the pump and the motor only in the periods in which the pump operation is required or desired.

Abstract: An automated high-precision plunger pump for volumes of less than 1 microliter, which is used in the microscope-assisted micromanipulation of biological material, comprises a housing (1) and a pump head (8) that defines a working chamber (9) with a common or separate inlet and outlet opening (10), wherein the volume of the working chamber (9) can be altered by an axially movable plunger (7) that can be introduced into it. The plunger (7) is axially movable via a threaded spindle (5) or a spindle nut (6) arranged in threaded engagement on the threaded spindle (5), and the threaded spindle (5) and/or the spindle nut (6) can be rotationally driven and the respective other component is designed to be rotationally lockable.

Abstract: An improved fire pump for a firefighting vehicle is provided. The fire pump is capable of being positioned at least partially under a rear portion of the cab of a firefighting vehicle. The pump includes a shaft, an impeller supported by the shaft, and a pump housing which encloses the impeller and supports the shaft for rotation about an axis. The housing includes a fluid inlet configured to direct a fluid into the housing along a path generally parallel to the axis. The housing also includes two fluid outlets each at a periphery of the impeller and configured to direct the fluid from the housing along respective paths generally perpendicular to the axis.

Abstract: A floor finish applicator including a cart having wheels and a body member constructed and arranged to receive a source of floor finish. The floor finish applicator also includes a pump coupled to the cart and operable to deliver floor finish to a floor, a floor finish feed conduit in fluid communication between the pump and a container supporting floor finish, and a transmission assembly coupled to the cart. The floor finish feed conduit supplies floor finish to the pump. The transmission assembly includes an axle coupled to and driven by a wheel of the cart, a drive gear connected to the axle, a drive shaft having a driven gear for engaging the drive gear and driving the pump, and a hand-actuated spring-loaded clutch for selective engagement of the pump and the drive shaft with the axle.

Abstract: A hybrid accessory drive system having two operational modes, a mechanical mode and an electric mode. The accessory is typically a cooling fan. A continuously variable mechanical belt drive mechanism drives the accessory as one mode of operation. An electric motor along with a planetary roller screw mechanism which converts rotary motion to axial motion is used to change the sheave position and thus the drive ratio. Upon disengagement of the mechanical drive mode, the electric motor can be used to drive the accessory in a second mode.

Abstract: A pump drive system having a pump drive element that is driven by a first or a second drive mechanism. The pump drive element is connectable or connected by a coupling element in a rotationally fixed connection either through a first free-wheel device to the first drive mechanism or through a second free-wheel device to the second drive mechanism.

Abstract: The present a hydraulic system and a method for operating a hydraulic system that includes an engine, at least one hydraulic pump, a pump box interposed between the engine and the at least one hydraulic pump, at least one hydraulic clutch pack interposed between the pump box and the at least one hydraulic pump, at least one valve, a hydraulic fluid reservoir, a clutch actuation pump, and one or more electronics. The at least one hydraulic clutch pack selectively transmits torque to the at least one hydraulic pump. The at least one valve may be opened to supply pressurized hydraulic fluid to the at least one clutch pack and may be closed to interrupt a supply of pressurized hydraulic fluid to the at least one clutch pack in order to selectively engage or disengage the clutch pack.

Abstract: A rotating system includes a drive member and a driven member. The rotating system includes a coupling positioned to rotatably couple the drive member to the driven member and a housing surrounding a portion of the coupling to define an inside and an outside, the housing having a plurality of apertures. A fan is coupled to the coupling and operable to produce a flow of air from the inside to the outside via at least one of the plurality of apertures, and a guide tube is positioned within one of the plurality of apertures to guide a flow of air from the outside to the inside.

Abstract: A magnetic coupling system may be used in a fluid displacement apparatus to magnetically couple a drive shaft to a piston. The magnetic coupling system may include first and second magnetic couplers at the ends of the drive shaft and piston, respectively. The first magnetic coupler and second magnetic coupler may be configured to exert an attractive force. A bearing between the magnetic couplers reduces friction and side loading.

Abstract: A compressor with a transmission includes a clutch that varies the rotational speed of an output shaft between two different speeds. The clutch includes a friction layer, which secures a ring roller by movement of the ring roller in a first direction (securing direction), a first control chamber, a first control piston accommodated in the first control chamber and movable in the direction of an input shaft axis, a first thrust bearing between the first control piston and the ring roller, a second control chamber facing the first control chamber, a second control piston accommodated in the second control chamber and movable in the direction of the axis), a second thrust bearing between the second control piston and the ring roller, and a pressure control mechanism, which controls a first control pressure supplied to the first control chamber and a second control pressure supplied to the second control chamber.

Abstract: Methods and systems are provided for pressurizing a transmission hydraulic circuit including a transmission mechanical pump coupled to an engine though a gearbox. One example method comprises, during an engine start, adjusting a speed ratio between the transmission pump and the engine between a first speed ratio and a second speed ratio, the pump rotating faster relative to the engine at the first speed ratio as compared with the second speed ratio. In this way, the pump may be driven at different speed ratios relative to the engine to provide better pressurization in the transmission.

Abstract: Some embodiments of a clutch system may drive an output portion to rotate at a first rotational speed when the clutch surfaces are engaged and to rotate at a second rotational speed when the clutch surfaces are shifted to a disengaged position. The viscous two-speed clutch system may employ a viscous drive system that causes the output portion to rotate even when the clutch surfaces are disengaged. In such circumstances, the cooling fan can be driven to rotate at a first rotation speed due to interconnection with a drive source and to rotate at a second rotational speed even when the clutch surfaces are disengaged. Thus, the clutch system facilitates the flow of cooling air both when the vehicle cooling system activates the fan (e.g. by causing the clutch surface to engage) and when the vehicle cooling system deactivates the fan (e.g. by causing the clutch surfaces to disengage).

Abstract: When grooves 44, 45A and 45B of an armature 42 and a rotor 43 are formed by laser beam machining, a metal oxide layer 100 is formed on wall surfaces defining the grooves 44, 45A and 45B. The metal oxide layer 100 is brought into sliding contact with a first contact surface A1 to a fourth contact surface A4 in a process in which an electromagnetic clutch is used, so that a part of the metal oxide layer 100 is ground and peeled off, whereby particles made of a metal oxide are produced. The particles enter the contact surface between the armature 42 and the rotor 43, which increases the frictional force therebetween to thereby prevent slippage. As a result, the torque transmission capability of the electromagnetic clutch M is enhanced, and the increase in the torque of a scroll compressor is achieved.

Abstract: Provided is a vacuum self priming pump. The pump includes an actuating member that is installed in an outlet by a hinge shaft to be capable of rotating and configured to be quickly opened by water pressure when water is discharged through the outlet, an arm that extends from the actuating member to an external side over the outlet, a clutch unit that is movably formed in a length direction of a rotational shaft of a motor to selectively transfer power to an eccentric wheel to free-rotate the eccentric wheel on the rotational shaft, and a transferring unit that is installed between the arm and the clutch unit to cut off the power from the clutch unit to the eccentric wheel when the arm moves.

Abstract: A continuously variable transmission apparatus includes an input shaft, an output shaft, a continuously variable transmission mechanism, a differential gear mechanism and a bypass shaft. The continuously variable transmission mechanism is placed between the input shaft and the output shaft and is adapted to conduct rotation of the input shaft to the differential gear mechanism after changing a speed of the rotation. The bypass shaft is placed coaxially with the input shaft and the output shaft and is adapted to conduct the rotation of the input shaft to the differential gear mechanism while bypassing the continuously variable transmission mechanism. The differential gear mechanism is adapted to conduct the rotation from the continuously variable transmission mechanism and the bypass shaft to the output shaft.

Abstract: A fan assembly that includes a fan having a fan hub and motor having a drive shaft and a drive member coupled to the drive shaft for rotation with the drive shaft. The fan hub includes an inner face and an outer face. The drive member contacts the inner face of the fan hub to define a plurality of discrete drive member contact zones between the drive member and the inner face of the fan hub. A clip engages the drive shaft and the outer face of the fan hub to couple the fan to the drive shaft. The clip contacts the outer face of the fan hub to define a plurality of discrete clip contact zones between the clip and the outer face of the fan hub. The plurality of drive member contact zones are generally aligned with the plurality of clip contact zones.

Abstract: A fluid pump includes a drive shaft driven by power from an engine, a rotor adapted to be provided at a housing and rotating unitarily with the drive shaft, a driving wheel which is provided separately from the drive shaft and to which the power from the engine is always transmitted when the engine is running, a driven wheel transmitting the power from the engine to the drive shaft upon being in contact with the driving wheel, and a displacement mechanism causing the driving wheel and the driven wheel to be out of contact from each other by moving at least one of the driving wheel and the driven wheel.

Abstract: A liquid pressure generating apparatus including a pump; and two one-way clutches arranged coaxially with the pump's drive shaft. Inner races of the respective two one-way clutches are integrated with each other to form a common inner race. Outer races of the respective two one-way clutches are formed independently from each other and are driven respectively by pump driving members different from each other. The common inner race includes a coupling portion coupled to the pump drive shaft and extending in the radial direction and a cylindrical body portion extending from the coupling portion in a second axial direction opposite from the first axial direction on the radially outside the pump drive shaft. The body portion includes a depression indented radially outward on an inner peripheral surface thereof. A lubricant supply portion for the depression is provided radially inside the depression.

Abstract: A liquid pressure generating apparatus including a pump, and two one-way clutches arranged coaxially with the pump drive shaft in a line in the axial direction on the side of a first axial direction. The pump case includes a projecting portion projecting from the corresponding pump case. Inner races of the respective two one-way clutches are integrated with each other and form a common inner race. Outer races of the respective two one-way clutches are formed independently from each other and are driven respectively by pump driving members different from each other, and directions of restricted relative rotation with respect to the common inner race are identical to each other. The common inner race includes a coupling portion to be coupled to the pump driving shaft on the side of the first axial direction with respect to the projecting portion.

Abstract: A hybrid vehicle has an internal combustion engine (10) and a hybrid drive (12) that has an electric machine (11) and a transmission (13) having a drive output. During driving under purely internal combustion engine (10) power, only the internal combustion engine provides a drive torque at the drive output. During driving under purely electric motor power, only the electric machine (11) provides a drive torque at the drive output. During hybrid driving, the internal combustion engine (10) and the electric machine (11) each provide a drive torque at the drive output. The hybrid vehicle also has a pump unit (16, 20). The pump unit (16, 20) can be driven by the electric machine (11) of the hybrid drive (12).

Abstract: In one embodiment of the present invention, a water pump (10) is configured such that rotation is transmitted in a non-contact condition from a drive-end rotation member (20) whereto rotation is transmitted from an engine to a driven-end rotation member (30) having a pump impeller (31). The drive-end rotation member (20) includes a vacuum chamber (50) and a pair of permanent magnets (26a, 26b) provided so as to be mutually opposed with different polarities. The driven-end rotation member (30) includes an induction ring (32) having an induction section (32b) provided so as to form a prescribed interval between the pair of permanent magnets (26a, 26b). Furthermore, the pair of permanent magnets (26a, 26b) is moved in a rotation axis direction with respect to the induction section (32b) due to the vacuum introduced into the vacuum chamber (50), and the overlap amount (L1) of the pair of permanent magnets (26a, 26b) and the induction section (32b) in the rotation axis direction is changed.

Abstract: A primary scotch yoke and a secondary scotch yoke are coupled in opposing arrangement and rigidly attached to a linearly reciprocating element. Each scotch yoke includes a rotary actuator with a cam follower and a yoke attached to the reciprocating element. Each yoke has a cam with an open gap through which the follower may be disengaged from the cam and stopped to an idle position. The follower of the secondary scotch yoke is kept idle in a position similarly disengaged from its cam. A controller detects a failure in the primary scotch yoke, disengages the cam follower of the primary yoke from its cam, and energizes the secondary scotch yoke, thereby causing its cam follower to engage its yoke and continue to provide uninterrupted motion to the reciprocating element, in particular the portable pneumatic pump driving an artificial heart.

Abstract: The disclosure relates to a device for pressurising a fluid to be combined with a rotary power takeoff of a vehicle including a casing and at least one multiplication stage, the device including a frame bearing at least one first rotatably moveable shaft bearing a member for moving the fluid and dynamic coupling means for coupling the shaft to the power takeoff. The frame includes means for bearing and attaching to the casing and the coupling means are arranged so as to directly connect the mobile shaft to the multiplication stage of the power takeoff. The disclosure also relates to a device for pressurising a fluid, including a frame, rotatably moveable first and second shafts each bearing a member for moving the fluid, and dynamic coupling means for coupling the first or second shaft to the power takeoff, including a removable pinion that can be alternately mounted on the first or second shaft.

Abstract: A wrap spring device includes a first hub and a second hub located axially to the first hub. A wrap spring is located externally and concentrically about the first and second hubs and glycol-based solution surrounds the spring. The spring is engaged and disengaged thereby causing the first and second hubs to engage and disengage each other.

Abstract: A rotary shaft is rotatable relative to a motor rotor. A first end face of the motor rotor is exposed to the outside of a stator. A hammer portion is provided at the first end face. The hammer portion is configured to be movable as the motor rotor rotates. A collision portion rotating integrally with the rotary shaft is configured to collide with the hammer portion. The allowance space between the collision portion and the hammer portion allows the hammer portion to be move relative to the collision portion. Therefore, the electric pump is capable of detaching a rotor from a pump chamber without increasing the size of the pump.

Abstract: In a pump driving device in an engine, driving a pump shaft of a pump mounted to an engine body by a valve-operating cam shaft supported by the engine body, a bolt is threadedly engaged with one end of the cam shaft, the bolt having a head portion in which a polygonal hole is formed, and a polygonal shaft portion is formed at one end of the pump shaft so as to be fitted into the polygonal hole. The pump shaft is driven by the cam shaft via the polygonal hole and the polygonal shaft portion. Thus, a large driving torque can be transmitted from the cam shaft to the pump shaft without reducing any effective support surface of a journal portion of the cam shaft.

Abstract: A limited free-motion coupling device 10 coupling an impeller 14 to a shaft 16 of a rotor 12, the coupling device 10 comprising first and second parts 20, 22 which are axially engaged for relative angular displacement about a rotational axis A, and two spherical coupling members 24 for engaging the first and second parts 20, 22 to prevent the relative angular displacement. One of the first and second parts 20, 22 is provided on the shaft 16 of the rotor 12, and the other is provided on the impeller 14. The first part 20 comprises two spaced coupling member arms 30 which project radially. The second part 22 comprises a cylindrical wall 66 extending coaxially with the rotational axis A of the coupling device 10. Two spaced arcuate channels 50 are formed in the cylindrical wall 66. Each coupling member 24 is received in and projects radially from a respective arcuate channel 50, and is freely movable between end walls of the arcuate channel 50.

Abstract: The device for torque transmission between a drive pulley (1) and a shaft (2) comprises a coupling flange (4) rotationally driven by the pulley and a hub fitted at the shaft end and rotationally joined to the shaft, with torque limitation means fitted between the coupling flange (4) and the hub (3), characterized in that the torque limitation means comprise a friction ring (28) comprising a plurality of projecting elastic portions in friction contact with a surface of the coupling flange (4) and/or of the hub (3).

Abstract: A compressor system supplies compressed air to a commercial vehicle. The compressor system includes a compressor, a clutch, and a hydraulic pump and can be driven by way of a drivetrain. The compressor can be completely disconnected from a driving engine by way of the clutch. The drivetrain encompasses a geared drive mechanism which allows the hydraulic pump to be driven, and the clutch is arranged between the geared drive mechanism and the compressor. A method for operating the compressor system is provided.

Abstract: The invention relates to a coolant pump (15) having a pump wheel (13) which is arranged on a pump wheel shaft (3, 11); and having a drive device (1; 8, 9) for the pump wheel (13), which drive device has a mechanical drive (1) and which drive device has an electric-motor drive (8, 9), wherein the pump wheel shaft is divided into a driving section (3) and a driven section (11), and an openable and closable clutch (4) is arranged between the driving section (3) and the driven section (11).

Abstract: A pumped shower draining device for a shower installation, comprises a housing having a waste water inlet and a waste water outlet, a pump element provided within the housing, a pump driving device for driving the pump element, and a variable-engagement clutch for providing variable driving engagement between the pump driving device and the pump element. An amount of engagement imparted by the in use clutch is determined by an amount of waste water flowing from a shower unit of the shower installation. Preferably, the clutch is self-regulating, so that the amount of engagement is determined by an amount of water in or at the clutch.