Abstract: The present invention relates to a sleeve connector for an electromagnetic clutch with a diode and a resistor for removing surge voltage and induced magnetic field generated from an electromagnetic clutch field coil assembly. According to the sleeve connector for an electromagnetic clutch of the present invention, an epoxy molding process that increases fabricating cost can be omitted, and also since the sleeve connector uses a holder for fixing each parts, it is prevented that each of the parts is deviated from its position during the plastic molding process.

Abstract: An electromagnetic clutch comprising a stator yoke, the stator yoke comprising a cylindrical portion with a slant inner surface and an annular base plate portion contiguous at an end thereof perpendicularly to one end of the cylindrical portion with the slant inner surface, a radial section cut from the central axis of said cylindrical portion with the slant inner surface being L-shaped, and a rotor, the rotor comprising an annular plate portion, a truncated inverse circular cone portion contiguous at an end thereof perpendicularly to an inner end of the annular plate portion and having a central circular through hole, and an outer cylindrical portion contiguous at an end thereof perpendicularly to an outer end of the annular plate portion, the rotor covering an upper end side of the cylindrical portion with the slant inner surface of the stator yoke and also covering an electromagnetic coil, the truncated inverse circular cone portion being disposed so as to be loosely fitted inside the cylindrical portion w

Abstract: A clutch mechanism includes a field core into which an electromagnetic coil is incorporated and is fixed to a base member, a rotor rotatably fitted on a shaft and passing through a central portion of the field core to be connected to a speed reduction mechanism and an armature accommodated on an inside diameter side of the output drum. The armature is fitted on the shaft in order to rotate and move in an axial direction and is magnetically attracted to the rotor when the electromagnetic coil is energized. Drum side locking portions are provided inside of the output drum such that armature side locking portions provided on an outer circumferential portion of the armature can move in an axial direction of the shaft relative thereto and can be brought into engagement therewith in a rotational direction to transmit the rotation of the armature to the output drum.

Abstract: Disclosed herein is a device that relates to a centrifugal magnetic clutch device. The device comprising an input shaft and, a plurality of input magnets that are rotatable about an axis of the input shaft, and are radially movable relative to the input shaft axis, and are rotationally fixed to the input shaft. The device further comprising, a plurality of output magnets rotatable about the input shaft axis and in axial alignment with the plurality of input magnets, and an output shaft rotationally fixed to the plurality of output magnets. The device further comprising, a housing for fluidically sealing the plurality of output magnets and the output shaft relative to the plurality of input magnets and the input shaft.

Abstract: The present invention relates to an assembling structure of field coil, which has a simple mounting structure for a diode and a resistor to cut an off-noise of an electromagnetic clutch and to prevent damage of peripheral parts due to surge voltage generation when power source applied to an electronic coil body is cut off, thereby improving a mounting efficiency, reducing a manufacturing cost by reduction of the number of parts, and realizing an automatic production. The assembling structure of field coil includes an electronic coil body (101), a core ring (110) and a sleeve (120) having a first and second terminals (131) (132), and a case that has a receiving part (135) and a first and second connection parts (136) (137).

Abstract: A drive power transmission control device is provided with an electromagnetic drive power transmission device and an ECU for controlling the application of electric current to an electromagnetic coil of the drive power transmission device. The ECU is bodily provided on a casing of the electromagnetic type drive power transmission device through at least one support member 50. The electronic control device is fixedly supported on an outer wall of the casing with a space between the electronic control device and the casing, such that cooling air can flow between the outer wall of the casing and the electronic control device.

Abstract: A mechanism for mechanically coupling a driving source and a driven member. The mechanism includes a first member coupled to the driving source and a second member coupled to the driven member. A resilient member exerts a force to bring the first and second members into pressure contact at a contact surface. A vibration is excited in the contact surface of the first member to produce a levitation force, based on an ultrasonic levitation, acting upon the second member. Frictional force between the first member and the second member is changed depending on the levitation force, thereby changing power transmitted between the first member and the second member.

Abstract: A hybrid linear actuator features a central load shaft on which a plurality of solid-state magnetostrictive thrusters are positioned in operative relation to electric motors of a permanent magnet synchronous type to impart linear thrust force to the load shaft through clutch units also positioned thereon and under control of force and stroke amplification of output force from motor shafts projecting from the motors.

Abstract: An ultrasonic clutch includes a driving element, a driven element and at least one alternating current (AC) power source. The driving element and the driven element are connected to a shaft of a driving device and an output axle of a loading, respectively. At least one of the driving element and the driven element is a piezoelectric device. When at least one of the driving element and the driven element is electrically connected to an AC power source, the near-field acoustic levitation, generated from the flexural vibration of the piezoelectric resonator above the piezoelectric resonator, occurs to push the driven element away from the driving element. Thus, the output shaft of the loading does not rotate with the axle of the driving device.

Abstract: In an auxiliary machine drive system of an automatic engine stop-restart system equipped automotive vehicle capable of automatically stopping or restarting an engine depending on vehicle operating conditions, an electromagnetic clutch is disposed between the engine and at least one auxiliary machine for connecting and disconnecting an engine crankshaft to and from the auxiliary machine. An electromagnetic clutch control unit deenergizes the electromagnetic clutch at least in an engine running state, and energizes it only when a predetermined energizing condition is satisfied. The predetermined energizing condition includes at least an engine stopped state. The electromagnetic clutch is comprised of a normally-engaged electromagnetic clutch that is engaged when deenergized, and disengaged when energized.

Abstract: The magnetic attraction force of an electromagnetic coil in an electromagnetic clutch is increased in a limited installation space, thereby improving reliability of operation. The dimensions of a field core housing the electromagnetic coil and a rotor are optimized to increase the magnetic attraction force. The thicknesses of cylindrical portions on the inner-diameter side of the field core and the rotor have larger thicknesses than those of cylindrical portions on its outer-diameter side so that the sectional areas of both cylindrical portions will be equal to each other. Also, a rotation transmission device provided with an electromagnetic clutch is proposed which can avoid deterioration of its sealing property and damage to its bearing and avoid cost increase.

Abstract: An ultrasonic clutch includes a driving element, a driven element and at least one alternating current (AC) power source. The driving element and the driven element are connected to a shaft of a driving device and an output axle of a loading, respectively. At least one of the driving element and the driven element is a piezoelectric device. When at least one of the driving element and the driven element is electrically connected to an AC power source, the near-field acoustic levitation, generated from the flexural vibration of the piezoelectric resonator above the piezoelectric resonator, occurs to push the driven element away from the driving element. Thus, the output shaft of the loading does not rotate with the axle of the driving device.

Abstract: Engagement characteristics of electromagnetic friction clutch pack assemblies disposed in, for example, motor vehicle transfer cases are improved, especially at the transition between static and dynamic friction modes, by superimposing a random noise signal on an otherwise smooth analog or stepped digital signal. The controller and driver for the clutch includes a random noise (signal) generator having an output which is superimposed on the controller output generated in response to signals from various sensors disposed on the vehicle. When the controller inputs cause clutch engagement in accordance with the controller software, an engagement signal comprising both a drive portion and a smaller random noise portion is supplied to the electromagnetic clutch operator. Improved, less perceptible clutch engagement action is thereby achieved.

Abstract: A mechanical ball coupling or clutch comprises a plurality of magnetizable balls located between inner and outer concentric caged needle rollers without raceways. The caged needle rollers are concentric with the axis of a hollow non-magnetic rotatable shaft which carries therewithin an actuateable electromagnet. Substantially surrounding the caged needle rollers and balls to form chambers therefor is a rotatable concentric shell of a non-magnetic material. Upon actuation of the electromagnet, the balls and needle rollers magnetically nest together to form a torque transmitting condition between the hollow shaft and the shell. A third set of needle rollers mounted in the wall of the hollow shaft allow the electromagnet to float in a non-rotating condition within the rotating hollow shaft.

Abstract: Magnetic clutch assembly for use in a hybrid oil and gas burner and a hybrid oil and gas burner that incorporates such an assembly. The magnetic clutch assembly is between the fan motor and the oil pump in order to selectively operate the oil pump and thereby prevent any oil fuel from circulating during gas mode. The assembly includes a magnetic clutch having an electromagnet and a magnetic clutch shaft for coupling the magnetic clutch assembly to a shaft of the fan motor, an inner clutch plate that fits on a shaft of the oil pump, an outer clutch plate, and a magnetic clutch housing for securely placing the assembly between oil pump and fan motor. When the burner is switched to oil mode the magnetic clutch assembly engages the oil pump and in gas mode it disengages the oil pump. Oil pump breakdown and oil fire danger are reduced.

Abstract: A magnetically driven pump comprises a sealing partition 48 whereof the central portion forms the rotational axis of the rotating portion of the pump, that central portion being itself supported and centered by a rotating connection piece 42 linked to or integral with drive shaft 41 of the motor 29.

Abstract: A drive member (1) for a water pump of the cooling-water circuit of an internal combustion engine, with a drive wheel (7) and a shaft (4) which is coupled to the water pump, is proposed. According to the invention, for the transmission of torque between the drive wheel (7) and the shaft (4), an electromagnetically actuable friction-disk clutch (9, 10, 11, 12) and a second clutch device in the form of an eddy-current clutch (14) are provided, the latter taking up the shaft (4) when the friction-disk clutch is out of engagement. Moreover, a frictional shift clutch for a drive member of this type is proposed.

Abstract: A power door clutch assembly including a motor that has a shaft operably connected to the motor. The clutch assembly also includes a clutch having a rotor associated with the shaft to provide rotational movement to the rotor. A stator is also provided that is positioned in juxtaposition to the rotor. A housing surrounds the clutch and includes an adjustable hall-effect sensor fixture that includes hall-effect sensors for allowing measurement of an angular speed of the clutch assembly.

Abstract: A frictional engaging device and frictional engagement control method, wherein the phenomenon of the frictional coefficient of the friction surfaces of a friction engagement device being changed when an electric field is applied to the friction surfaces, is utilized to control the transmittal force. Under the action of a pushing force, friction engagement members are brought into direct contact with each other for frictional engagement. When an electric field is applied between the frictional engagement members, the frictional coefficient of the friction surfaces changes, which means that the transmittal force can be changed. An example of the frictional engagement device is a clutch device (10). A friction member (20) made of insulation material is attached to an input disk (16) and engages an output disk (22). The friction surfaces are lubricated. A control device (30) controls a voltage applying device (28) and applies a voltage to an electrode (26) to provide a desired transmittal force.

Abstract: An electro-magnetic actuator includes a shaft having a first end portion and a second end portion and a nut having an inner peripheral surface and an outer peripheral surface. The inner peripheral surface of the nut is coupled with the first end portion of the shaft. A bearing is disposed around the second end portion of the shaft for rotatably supporting the shaft. An electrical coil is disposed around the shaft between the nut and the bearing for receiving electrical current and producing magnetic flux. A ferromagnetic can is disposed around the shaft having a peripheral surface extending between the shaft and the outer peripheral surface of the nut for establishing a path for magnetic flux flow there between. The peripheral surface of the can is interposed between the electrical coil and the bearing partitioning the electrical oil inside the can and the bearing outside the can.

Abstract: A driving force distribution device which controls the engagement forces of electromagnetic clutches and which govern the torque distribution between the driving wheels of a vehicle by calculating a target magnetic flux density and converting the same into a target excitation current. Since the relationship between the target magnetic flux density and the target excitation current changes according to a decrease in the air gaps accompanying wear of the frictional engagement members of the electromagnetic clutches, a relationship between the magnetic flux density and the excitation current is determined by applying current to the electromagnetic clutches when torque distribution control is not being carried out such as when the system is started, and the target excitation current is calculated from the target magnetic flux density based on the determined relationship.

Abstract: This invention pertains to a power transmission device suited for use in a hybrid car for selective transmission of its engine and motor powers. The power transmission device is used to transmit and cut off driving forces from an internal combustion engine or a motor of a hybrid car, and includes a two-way clutch having engaging elements, and a control mechanism for controlling the locking and freeing of the two-way clutch. The control mechanism includes an electromagnetic clutch having an electromagnet and an armature. By mounting such power transmission devices on the outputs of the engine and the motor, it is possible to easily transmit and cut off driving force by simply turning on and off the electromagnet.

Abstract: A driving device, which can maintain a sufficient rated torque of the non-magnetization type electromagnetic clutch, comprises a driving motor and a driving gear. The driving motor and the driving gear are connected by a non-magnetization type electromagnetic clutch. The electromagnetic clutch comprises a driving shaft, wherein the driving shaft of the electromagnetic clutch is made of non-magnetic material. Because the driving shaft is made of non-magnetic material, therefore the magnetic field of the permanent magnet is not adversely affected or disordered, and a stable rated torque can be achieved.

Abstract: Two sensors are provided on a clutch core. Sensor coils are driven at a high frequency by a high-frequency driving circuit. As the sensors sense a magnetic flux of a magnetic circuit including the clutch core and an armature, the impedance of the sensor coils changes. In accordance with the outputs from the sensor coils at this point, an impedance detecting circuit detects the impedance of the sensor coils. Then, an impedance combining circuit combines the impedance of the sensor coils. On the basis of the combined impedance, a current control circuit controls a current supplied to an exciting coil. Thus, the attracting force of the armature to the core excited by the exciting coil is controlled.

Abstract: A semi-automatic transmission comprises an input shaft; a countershaft; constantly meshed gears arranged between the input shaft and the countershaft; and an electrically controlled dog clutch operatively disposed on one the input shaft and the countershaft. The dog clutch is of a type which is free of a synchronizing mechanism and fastens one of the meshed gears to a corresponding one of the input shaft and the countershaft when operated, thereby to establish a given torque transmission path from the input shaft to the countershaft. An electromagnetic multiple disc clutch is employed, which has an input part adapted to be driven by an engine and an output part connected to the input shaft. A control unit is further employed, which controls the dog clutch in accordance with information signals applied thereto.

Abstract: A control device for hydraulic, mechanical, and hydraulic-mechanical components has a housing in which at least one drive element is arranged. The drive element is a piezo element having a voltage-dependent stroke-force behavior. The piezo element acts directly onto the component to be actuated. The control device with the piezo element replaces actuating devices such as solenoids, complete valves, as well as coupling and switching mechanisms.

Abstract: An automated gear change for an automobile vehicle, in particular for an industrial vehicle, provided with an input shaft, an output shaft, a geared transmission interposed between these input and output shafts and including an auxiliary shaft and a plurality of gears mounted in an angularly idle manner with respect to this output shaft and a plurality of engagement members for each gear that can be selectively actuated in order to make this gear angularly rigid with the output shaft; each engagement member is mounted to slide in a respective pair of seats that face one another and communicate and are associated with the relative gear and, respectively, with the output shaft, and can move between a first disengaged operating position in which it exclusively engages one of the seats and a second engaged operating position in which it engages both the seats; the gear change is further provided with actuation means of electromagnetic type in order to control the displacement of each engagement member between the

Abstract: A method for controlling a clutch 24 for an engine-powered system 26 in an automotive vehicle 10 is provided. In one embodiment, the engine-powered system 26 is an air conditioner system. The method includes the step 58 of generating an engine roll signal responsive to an oscillating roll movement of an engine 22 of the vehicle 10 about a torque roll axis 32. The engine roll signal is indicative of an oscillating engine roll acceleration about the torque roll axis 32. The method further includes the step 66 of determining a direction of the oscillating roll movement utilizing the engine roll signal. Finally, the method includes the step 74 of actuating the clutch 24 responsive to an operational parameter of the engine-powered system 26 and the direction of the oscillating roll movement.

Abstract: A dustproof implement applied to a clutch to be attached to a compressor in an air-conditioning system loaded on a working vehicle, comprises a plate to be disposed opposite to an annular recess of a rotor of the clutch and fixed at the compressor, and an annular pad attached to the annular plate and abutting the rotor on the outer peripheral side of the annular recess of the rotor.

Abstract: A thread-cutting apparatus with reversal of the direction of rotation with a sun-and-planet gear with an axially displaceable reversing device for reversing the direction of rotation of a drill, held in the grip of a spindle, which can be pulled out preferably against a length equalization spring after a given drilling head depth has been reached, especially reversing chucks with pressure equalization pipelines, which discharge into an equalization chamber, sealed by a movable wall from the outside air, wherein the reversing device is actuated by an external driving element, which can be actuated by a reversing signal generated by an actuator.

Abstract: A control system for a linear actuator having an electric motor drawing a variable current level during operation. The control system includes a current level sensor for determining an operational current level of the linear actuator and a controller for generating a drive signal and a force request signal representative of a desired current level of the linear actuator. The drive signal remains constant during a predetermined time interval of the controller. The control system further includes a current limiting component for receiving the force request signal, the current level of the linear actuator and the drive signal. The current limiting component minimizes the current level of the electric motor in response to a comparison between the force request signal and the desired current level within a time interval substantially smaller than the predetermined time interval of the controller.

Abstract: There is provided an apparatus for determining a failure of an electromagnetic clutch, which is capable of properly determining whether or not a failure, a typically a layer short-circuit, has occurred due to a change in a resistance value of a solenoid coil of the electromagnetic clutch. The electromagnetic clutch is configured such that the engagement force thereof is varied according to an amount of current flowing through the coil. An output control value for control of the amount of current is calculated by feedback control such that an actual amount of current actually flowing through the coil becomes equal to a desired amount of current. A predetermined reference control value is stored which defines a standard for the output control value and has a standard relationship with respect to the amount of current. The actual amount of current is detected. The calculated output control value is compared with the predetermined reference control value corresponding to the detected actual amount of current.

Abstract: This invention pertains to a power transmission device suited for use in a hybrid car for selective transmission of its engine and motor powers. The power transmission device is used to transmit and cut off driving forces from an internal combustion engine or a motor of a hybrid car, and includes a two-way clutch having engaging elements, and a control mechanism for controlling the locking and freeing of the two-way clutch. The control mechanism includes an electromagnetic clutch having an electromagnet and an armature. By mounting such power transmission devices on the outputs of the engine and the motor, it is possible to easily transmit and cut off driving force by simply turning on and off the electromagnet.

Abstract: An electromagnetic coupler couples a first rotating element with a second element with a torque transfer between the first and second elements. The coupling is solely by a magnetic field which can be fully coupled, fully uncoupled or modulated to provide a variable transmission of power between the first and second elements. The electromagnetic coupler comprises a set radially disposed electromagnets and a concentric set of pole pieces separated by an air gap. The magnetic field between the electromagnets and the pole pieces is increased as the current through the electromagnets is increased. At low current, there is substantial slippage between the respective driving and driven elements. With full magnetic coupling, the electromagnets and pole pieces are fully coupled or without any slippage therebetween. When the magnetic field is eliminated, there is no torque transfer between the driving and driven elements.

Abstract: A hysteresis slip clutch having an adjustable stall torque is provided. The clutch components include first and second rotors, with a housing at least partially enclosing the rotors. An annular permanent magnet is rigidly mounted on the first rotor and an annular hysteresis sleeve is rigidly mounted to the second rotor. The first and second rotors are mounted within the housing such that the magnet and hysteresis sleeve are concentrically located and axially aligned with one another within the housing. In this orientation, magnetic flux from the magnet penetrates the hysteresis sleeve and magnetic hysteresis developed within the hysteresis sleeve acts to oppose relative angular motion between the first and second rotors. The magnetic hysteresis establishes a torque by which angular motion of the first rotor is transferred to the second. A annular magnetic shunt is adjustably mounted to the housing.