Abstract: A self-supporting brush holder assembly 10 is disposed on the cylindrical outer surface of a shaft 20 of a viscous fan drive 11 which is rotatable about an axis of rotation 25. The brush holder assembly includes a first portion 12 having a generally C-shaped concave surface 16 and a second portion 14 having a generally C-shaped concave surface 18 which is adaptable to mate with the generally C-shaped concave surface of the first portion to define an annular surface 28 defining a cylindrical opening having its longitudinal axis adapted to be disposed coaxial to the axis of rotation. The cylindrical opening is adapted to surround the cylindrical outer surface of the shaft 20 with the annular surface 28 being disposed contiguous to the cylindrical outer surface of the shaft 20 to support the first and second portions 12, 14 on the shaft 20 to prevent radial movement between the shaft and the first and second portions.

Abstract: A spring engaged fluid released fan clutch is disclosed. A sheave connected to a live shaft is connected to rotate with a friction disc. Encompassing the friction disc and rotatable relative thereto is an outer shell portion carrying fan blades. Connected for rotation with the outer shell portion and rotatably mounted on the friction disc is a cylinder plate. An annular piston, having a friction facing, is slidably mounted on a hub provided internally of the outer shell portion and is connected to rotate with the shell portion. Springs urge the piston with its friction facing into engagement with the friction disc to engage the clutch. Fluid pressure is introduced through the hub of said outer shell portion and into a cavity between the cylinder plate and the piston urging the piston away from the friction disc against the action of the springs to disengage the clutch.

Abstract: A viscous fan clutch (10) is typically employed in a fan drive mechanism within a truck or automobile. A shaft (12) driven by the engine, rotates a clutch member (24) within the fan drive. The clutch member is arranged for fluid engagement with a cover assembly (38) for the transmission of torque thereto when the fluid is disposed in an operating chamber (70) defined by complementary shear surfaces (30, 31, 56, and 57) in the clutch and cover. During the relative rotation between the clutch and cover, fluid is pumped from the operating chamber to primary (76) and secondary (77) fluid storage chambers. A fluid temperature responsive control valve (190) provides for selective communication between the storage chambers and the operating chamber to effect modulation of the total fluid flow whereby quasi dual speed operation of the clutch is achieved.

Abstract: A viscous fan clutch (10) is typically employed in a fan drive mechanism within a truck or automobile. A shaft (12) driven by the engine, rotates a clutch member (24) within the fan drive. The clutch member is arranged for fluid engagement with a cover assembly (38) for the transmission of torque thereto when the fluid is disposed in an operating chamber (70) defined by complementary shear surfaces (30, 31, 56, and 57) in the clutch and cover. During relative rotation between the clutch and cover, fluid is pumped from the operating chamber to primary (76) and secondary (77) fluid storage chambers. Independent fluid temperature responsive control valves (120 and 190) provide for selective communication between the storage chambers and the operating chamber to effect modulation of the total fluid flow whereby dual speed operation of the clutch is achieved.

Abstract: A regulation apparatus for determining the flow of fluid to a hyraulically-operated cooling fan of an air-cooled internal combustion engine includes an electromagnetic valve connected in the fluid line to the cooling fan, a control unit which sends a signal to the electromagnetic valve to control its operation, and multiple sensor elements which are positioned in or near the engine to detect the various parameters which affect its operation, the sensor elements sending electrical input signals to the control unit.

Abstract: A viscous fan clutch (10) is typically employed in a fan drive mechanism within a truck or automobile. A shaft (12) driven by the engine, rotates a clutch member (24) within the fan drive. The clutch member is arranged for fluid engagement with a body member (42) for the transmission of torque thereto when the fluid is disposed in an operating chamber (70) defined by complimentary shear surfaces (30 and 56) in the clutch and body members. During relative rotation between the two members, fluid is pumped from the operating chamber to a storage chamber (76). Fluid is returned to the operating chamber via bleed ports (94) which are selectively restricted by an electromagnetically controlled valve (88). A control system (110) senses vehicle coolant temperature and actuates the valve as a function thereof.

Abstract: A fluid coupling device is disclosed of the type including a valve member actuated by a valve shaft extending through the cover, the position of the valve and valve shaft being controlled by a temperature responsive bimetal coil. The coil has a first end attached to the valve shaft and a second end (free end) received within a receiving portion of a clip member. Disposed between the second end of the coil and the receiving portion of the clip member is a resilient elastomeric member having a relatively thin wall. The clip member includes at least one wing portion which is attached to the cover to define an enclosure. The enclosure is configured to engage the elastomeric member which is compressed against the second end portion of the coil on at least two sides. The elastomeric member fills the clearance between the coil and the clip, even if the thickness of the clearance is not uniform, to increase the coefficient of friction, and the total gripping force, between the clip and coil.

Abstract: A viscous fluid coupling including a rotatable casing provided with a fluid operating chamber and a fluid reservoir chamber therein and having an axial opening formed in said casing, a rotor located in the fluid operating chamber and rotatable relative to the casing, a valve shaft rotatably received in the axial opening formed in the casing, a valve member 27 fixed to an inner end of the valve shaft and operable to control fluid communication between the fluid operating chamber and the fluid reservoir chamber, a bimetal coil located on an exterior portion of the casing, the bimetal coil being connected at inner and outer ends thereof to an outer end of the valve shaft and the casing, respectively, and a plurality of sealing rings axially spaced and interposed between the outer periphery of the valve shaft and a wall of the opening wherein the sealing rings include a resilient material.

Abstract: A viscous fan clutch is typically employed in a fan drive mechanism within a truck or automobile. A shaft, driven by the engine, rotates a clutch member within the fan drive. The clutch member is arranged for fluid engagement with a body member for the transmission of torque thereto when the fluid is disposed in an operating chamber defined by complimentary shear surfaces in the clutch and body members. During relative rotation between the two members, fluid is pumped through a radially disposed standpipe to a point within a fluid storage chamber near the axis of rotation to prevent bleed back of the fluid through the pump at times when the pump pressure is relatively low.

Abstract: A fluid friction clutch especially for powering a rotary cooling fan for an internal combustion engine. The clutch has a driven part with a drive disc rotating in a drive chamber which is separated from a fluid reservoir chamber by a separating wall within the clutch housing. A passage in the separating wall can be opened and closed by a valve assembly which is actuated by a temperature-dependent element. The temperature-dependent element is an expansion element containing a substance which undergoes volume changes as a function of temperature. The expansion element is heated electrically by means of a PTC resistor under the control of a thermal switch which reacts to engine-related temperatures. When the power supply to the PTC heater is interrupted, the clutch engages and provides full cooling power.

Abstract: Viscous magnetic clutch for a radiator cooling fan which is electrically energized on closure of thermoswitch mounted within coolant of engine radiator. The clutch plate serves as a fluid pump to feed the viscous sheer area of the clutch so that conventional pump plate construction is eliminated. A drain hole within the clutch plate is controlled by magnetically operated valve mechanism on thermoswitch signal to provide for the retention or exhaust of fluid from the sheer area to provide for the selective hydraulic clutching or declutching of the fan and the drive.

Abstract: A viscous fluid clutch (10) rotatable about an axis of rotation (24) and adapted to be controlled by a temperature sensing element (104). The fluid clutch includes an axially extending shaft (22) disposed on the axis of rotation, a first member (14) secured to the shaft for rotation and a second member (16) rotatably disposed on the shaft relative to the first member. Shear surfaces (62, 64) are disposed on the first and second members and form an operating chamber (18) therebetween. A fluid storage chamber (70) is disposed adjacent to the operating chamber and valve means (80) is provided for effecting selective communication between the storage chamber and the operating chamber and includes a valve member (82) having first and second positions, one of which provides fluid communication between the storage chamber and the operating chamber and the other which blocks the fluid communication. A fluid is disposed within the storage chamber and is selectively displaceable into the operating chamber.

Abstract: A thermally responsive actuator device which includes an extending tubular coil temperature sensing portion. The tubular coil contains a thermally responsive expansible-contractible material which operates upon an actuator member. Thus, the thermally responsive material accurately and rapidly senses ambient or air mass flow temperature conditions for operation of the actuator member.

Abstract: Electro-viscous fan clutch having an electromagnet carried by a rotatable pump plate within the confines of the clutch housing. The electromagnet controls a spring arm valve element which is deflected to a spring loaded position by the generated magnetic field so that viscous clutch operation is terminated. On deenergization of the electromagnet, the valve element springs back to a position in which the fluid gate is opened to allow viscous operation of the clutch for engine cooling.

Abstract: A viscous fluid coupling device for use in automotive vehicles includes an input member driven by a vehicle engine and having a rotor thereon, a reservoir chamber for the viscous fluid and an operating chamber for accommodating the rotor which chambers are formed by a partition plate within an output member rotatable relative to the input member, first passage means formed on the partition plate for sending the viscous fluid from the operating chamber to the reservoir chamber, second and third passage means for communicating the viscous fluid from the reservoir chamber to the operating chamber, and thermal responsive means for opening and closing the second and third passage means in response to the change of temperature.

Abstract: A viscous fluid coupling device for controlling the revolutions per minute of a radiator cooling fan in three steps in response to the temperature of an engine. The viscous coupling device includes a rotor driven by an engine, a casing member, a cover member, a labyrinth formed between projections of the rotor and projections of the casing member, a partition plate dividing the interior of the casing member into an operating chamber and a reservoir chamber, a first oil returning passage and a first pump formed in the inner circumference of the partition plate, and a second oil returning passage and a second pump formed in the outer circumference of the partition plate, with temperature-controlled valve apparatus for controlling the passages to thus control the shearing force between the casing member and rotor.

Abstract: A clutch is disclosed with at least two engaging surfaces and a friction lining between the surfaces. Interposed between the friction lining support member and a driven member is a fusible, low melting point material, which can be an alloy or an element. At an elevated clutch temperature, dependent upon the melting temperature of the selected material, the material will melt and allow the driven member to slip or freely rotate relative to the driving member. The material solidifies upon cooling below its melting temperature, and thereby allows the clutch to engage and function in its usual manner with no maintenance or repair.

Abstract: A viscous fluid clutch is provided which embodies first, second and third drive members rotatable about a common axis. The second drive member is provided with an internal chamber in which both the first and third drive members are disposed. A predetermined amount of viscous fluid is disposed within the chamber. The third drive member is positioned between the first drive member and a chamber-forming wall of the second drive member. The second and third drive members rotate as a unit and the third drive member is movable axially independently of said second drive member. Corresponding surfaces of the first and third drive members form therebetween an annular fluid shear space concentric with the rotary axis of the drive members. The chamber-forming wall of the second drive member is provided with a thermal-responsive membrane having a segment thereof independently movable axially of the first drive member in response to predetermined ambient temperature changes.

Abstract: A torque transmitting device is adapted to transmit torque from an input (32) and includes a first member (14), a second member (16) rotatable relative to the first member about an axis of rotation (24), an operating chamber (18) disposed in the first member, a fluid reservoir (70), a fluid passageway (74) communicating with fluid reservoir in the operating chamber and a valve member (82) for controlling the fluid flow through the fluid passageway. A fluid is disposed in the reservoir and is selectively displaceable into the operating chamber through the fluid passageway whereby fluid is positioned in the operating chamber to transmit energy through the fluid from one of the members to the other. A thermostatic ring (90) is connected to the valve member for controlling the position of the valve member and the volume of the fluid in the operating chamber in response to the ambient temperature of the torque transmitting device.

Abstract: A fluid coupling device is disclosed of the type including an output coupling assembly (13) which defines a fluid operating chamber (37) and a fluid reservoir chamber (41). Rotatably disposed within the operating chamber is an input coupling member (11), including a disc-like portion (31), which defines rearward lands (61) and forward lands (65). The lands defined by the input coupling member cooperate with the lands (63 and 67) defined by the output coupling assembly to define rearward and forward shear spaces, operable to transmit torque from the input member to the output assembly. The disc-like portion defines a plurality of fluid passages (71) which communicate between the inner and outer radial peripheries of the disc-like portion, and also communicate with both the forward and rearward shear spaces. During filling, fluid flows radially outward through the fluid passages, and directly into the shear spaces, to substantially reduce the response time of the coupling device.

Abstract: A viscous fluid coupling for connecting a cooling fan to an engine radiator including a rotatable casing having a fluid operating chamber and a fluid reservoir chamber therein, the chambers being in fluid communication one with the other; a rotor located in the fluid operating chamber and being rotatable relative to the casing; valve means operable to control fluid communication between the chambers; and a bimetal coil on the exterior of the casing, the inner end of the coil being operatively connected to the valve means and the outer end of the coil being pivotally connected to the casing.

Abstract: A viscous drive mechanism, especially for an automotive cooling fan, is provided in which the input member is flexibly mounted to the input drive shaft in a manner permitting it to be moved axially under the influence of a thermostatic device to vary the working space gap between the impeller and the output drive member, thereby varying the output speed of the drive according to a given temperature variation.

Abstract: A temperature-controlled, fluid-friction clutch filled with a viscous fluid. The clutch has a drive disk mounted for rotation, the disk being flexible in the direction of the rotational axis. First and second clutch-driven plates have respective co-planar drive surfaces facing and spaced apart from surfaces of the drive disk, the space between the clutch-driven plates defining a fluid working space. A fluid storage space is also defined and an element is provided for pumping fluid from the working space into the storage space. A temperature-controlled valve controls flow of fluid between the working space and the storage space.

Abstract: This fan clutch has an external stationary electromagnet energized in response to cooling signal to axially move an armature operatively connected to a valve member that controls the circulation of fluid into a rotatable viscous clutch. With the fluid circulating, the fan blading is hydraulically driven to draw cooling air through the vehicle radiator. When fan operation is no longer required, the electromagnet is automatically deenergized so that an internal spring moves the valve member to a closed position to terminate the supply of viscous fluid to the clutch to increase clutch slippage and establish the disengaged mode of clutch operation.

Abstract: A pumping element configured in assembly as a generally "L" shaped member having an axially extending portion interposed between the inner peripheral surface of the housing and the outer peripheral surface of the clutch of a viscous drive to direct fluid between two side surfaces radially inwardly toward a radial front edge of a radially extending portion of the pumping element thereafter into the outlet opening in the pump plate. The pumping element allows for the construction of a viscous drive having a relatively low angular velocity in the disengaged mode, a relatively high angular velocity in the engaged mode without high speed pump out, and a relatively short pump out time.

Abstract: A rotary drive shaft disconnect mechanism which mechanically joins two aligned shafts and which disconnects them in response to the overheating of an eutectic metallic element. This mechanism utilizes a fuze of the type which is composed of a multiple number of structural wires which are maintained in position by the eutectic matrix. The heating of the eutectic matrix removes the lateral or side support from the wires permitting collapse of the eutectic element. The eutectic element is contained within a predetermined cavity within the drive shaft, and is prevented from escaping and contaminating oil which is in the region of the output spline of the shaft. When the shaft is disconnected, a flange moves against a seal to prevent any escape of eutectic material from the region of the shaft and into the cooling oil.

Abstract: A fluid friction clutch, especially for driving the cooling fan of an internal combustion engine. The rotating clutch housing has a separating wall defining a fluid reservoir chamber and a drive chamber and the separating wall has a passage which is opened and closed by a valve. The valve is actuated by an electromagnet disposed substantially coaxially with the clutch. A permanent magnet is attached to the valve assembly coaxially with the electromagnet and of opposite polarity to the magnetic field polarity which occurs when the electromagnet is energized. Upon energization, the opposing magnetic fields repel the two magnets and cause the valve to close, thereby disengaging the clutch. When the electromagnetic is deenergized, a spring reopens the valve and permits full engagement of the clutch.

Abstract: Torque transmitting fluid couplings of two types are described, one a thermatically controlled coupling and the other a torque limiting coupling. Both are characterized by the use of parts which can be manufactured at low cost and easily and quickly assembled, and contribute to greater efficiency in operation than fluid couplings of these types which have heretofore been marketed. Both utilize a housing or casing which is die-cast complete and finish bored, a drive shaft and coupling flange made of two separate pieces, which are welded together, ball bearing mounts, a cover or cover member made as a metal stamping, and a drive disc which is die-cast, in a single piece, to provide a friction ring and friction segments molded integrally therewith.

Abstract: A fluid shear coupling is disclosed herein which comprises a coupling disc received within a housing. The coupling disc and housing are mounted for coaxial rotation, and the coupling disc is connectable to a drive pulley assembly for driving the coupling disc in rotation. The coupling disc includes a pair of annular flanges extending axially in opposite directions from the periphery of the disc. The flanges define inside and outside working surfaces with the inside and outside working surfaces including helical grooves for moving a fluid received against those surfaces in a predetermined direction. The housing includes working portions closely conforming to the working surfaces of the flanges. A fluid reservoir is defined by the housing and is operable to move a working fluid into the space between the flanges and the working portions of the housing to provide variable coupling of the housing with the coupling disc.

Abstract: An electro-viscous hydraulic clutch for a fan clutch in which a control arm for controlling the fluid to a shear zone of the fluid clutch is incorporated in an over-center spring which hinges on the pump plate for snap action operation. The control arm is actuated by an electromagnetic device which is mounted either on a fan clutch cover plate or on the fan clutch shaft pole. This invention features low actuating force, snap action control arm operation and integral spring return. The spring return disengages the clutch when the solenoid or coil power is removed.

Abstract: A three-phase accessory drive system associated with the engine of a vehicle and providing a high ratio drive phase from vehicle engine idle to a first predetermined engine speed, a substantially constant speed drive phase above the first predetermined engine speed to a second predetermined engine speed and a low ratio drive phase above the second predetermined engine speed. The accessory drive speed is also temperature compensated.The drive system comprises the combination of a planetary gear set, a friction brake, a friction clutch and a hydraulic system operatively associated with the brake.

Abstract: A temperature responsive clutch which engages the radiator cooling fan of a motor vehicle engine when the engine temperature is sufficiently high. The clutch comprises a housing rotatably mounted on a shaft which is adapted to be attached to the fan mounting of the engine. The housing has means for mounting a fan and comprises front and rear housing plates attached together to form an enclosed chamber for holding a viscous fluid. A rear inner plate is fixedly attached to the shaft within the chamber. A front inner plate located within the chamber is slideably mounted on pins extending from the front housing plate to allow the front inner plate and the housing to rotate together and to allow the front inner plate to move axially. The legs of a U-shaped member extend through apertures formed through the front inner plate and are attached to the front housing plate.

Abstract: A viscous fan clutch is typically employed in a fan drive mechanism within a truck or automobile. A shaft, driven by the engine, rotates a clutch member within the fan drive. The clutch member is arranged for fluid engagement with a body member for the transmission of torque thereto when fluid is disposed in an operating chamber defined by complimentary shear surfaces in the clutch and body members. During relative rotation between the two members, fluid is pumped through a return passage to a valve coaxially disposed with the driven shaft which selectively directs a flow of viscous fluid alternately to a storage chamber or directly back into the operating chamber. The valve is biased into a first position in which the fluid is directed into a fluid storage chamber and is actuated into the second position by means of a coaxially disposed solenoid acting upon ferrous metal members of the valve.

Abstract: Temperature responsive viscous fan drive having a reduced pump-out time. A pair of diametrically opposed notches opening radially outwardly are provided on the outer peripheral surface of the clutch member of the drive. The notches extend parallel to the axis of rotation of the clutch member between the sides thereof. An impeller element secured to the housing member of the drive is aligned with the notches and located adjacent one side of the clutch member to pump fluid from the operating chamber into the storage chamber. The outer peripheral surface of the clutch member is relatively close to the inner peripheral surface of the housing member.

Abstract: A temperature responsive drive mechanism for an engine accessory adapted to be connected to the oil pressure supply line for an engine and including a fluid circuit which is temperature responsive and requires only two fluid passages to provide for lubrication of the device, return of fluid to the oil sump, and the actuating pressure supply for the clutch mechanism included in the device. A rotatable driven housing is provided including therein a rotatable driving clutch drum and a non-rotating actuator mechanism adapted to move the drum into engagement with a complimentary surface on the interior of the housing.

Abstract: A viscous fluid coupling device for use in automotive vehicles includes a rotatable input shaft driven by an engine and a rotatable output member driven by the input shaft via shearing force of viscous fluid thereby rotating a cooling fan in unison therewith. The output member is made of aluminum alloy whose coefficient of thermal expansion is larger than that of iron. The device includes a bearing set which is interposed between the output member and a stationary member made of iron. The bearing set is braked by the output member and the stationary member thereby decreasing the rotational speed of the fan when the ambient air temperature of the engine is below a predetermined value.

Abstract: An apparatus for protecting a compressor from breakdown, in the case where the compressor is arranged so as to be connected to a drive source by means of an electromagnetic clutch having therein an excitation circuit connected, at its one end, to electric power source, and at its other end, to a body of the compressor via a grounding lead wire, which is characterized in that the grounding lead wire is connected to the body of the compressor by means of an electrically conductive connecting member made of a material which is capable of melting under a thermal effect of the compressor when the compressor is overheated.

Abstract: A fluid coupling device is disclosed of the type including an output coupling member, a cover, a valve plate separating the fluid reservoir chamber from the fluid operating chamber, and an input coupling member rotatably disposed in the operating chamber. Valving controls the flow of fluid between the reservoir and the operating chamber in response to variations in a condition such as temperature. The input member has a front face adjacent the valve plate and a rear face cooperating with the adjacent surface of the output member to define interdigitated lands and grooves. The input member defines a plurality of fluid passages permitting direct axial communication of fluid between the front face and the lands and grooves. This direct flow into and out of the lands and grooves is effective to reduce substantially the time required to achieve full engagement and full disengagement of the coupling.

Abstract: The disconnect arrangement for high speed aircraft generators includes disconnectable rigid, torque transmitting spring loaded curvic gears coupled between the driving and driven shafts. A plurality of flexibly supported sear members mounted on the driven shaft engage the movable member of the curvic gears. The sears have tapered faces which engage correspondingly tapered shoulders on the movable curvic gear member. The sears are latched to hold the curvic gear members in contact by the armature of an electromagnet. The armature normally rides over the top of the gears maintaining them in contact with the tapered shoulder of the curvic gear member. When the electromagnetic armature is actuated to disengage the driving and driven shafts, the armature moves axially. This removes the retaining force from the tapered sears, allowing them to flex outwardly.

Abstract: A thermostatically controlled fan clutch having input and output members journalled about a fixed support shaft. A series of clutch plates are alternately connected to the input and output members. An annular piston housing and piston rotate with the input member and are pressurized to engage the clutches. A bore extends through the piston and connects with an annular groove on its contact face to control clutch engagement and assist in disengagement.

Abstract: A viscous fluid coupling employing an electro magnet which receives electrical pulses in response to a signal received from a heat sensing device to operate a valve arm to seal and unseal an inlet passage fluidly communicating an operating chamber with a storage chamber. The operating chamber is defined by a clutch member and a housing member that are rotatably disposed relative to one another. The storage chamber is defined by the housing and is in fluid communication with the operating chamber via a discharge passage and the inlet passage. A pump displaces fluid from the operating chamber through the discharge passage into the storage chamber. The inlet passage directs fluid when unsealed from the storage chamber to the operating chamber. The valve arm is moved in one direction in response to inducing a magnetic field and in the other direction by a spring when the magnetic field is not induced.

Abstract: Engine cooling fan with viscous-magnetic clutch which is electrically energized on closure of thermal switch mounted within engine coolant. As fan coil housing is driven on engagement of the magnetic clutch, silicone fluid is centrifugally displaced into working area of viscous clutch for fluid drive of fan body. Because of slippage in the fluid drive, fan speeds will gradually increase from minimum to maximum speeds. With progressive increase in speed, conventional fan blading can be employed without excessive fan generated noise.

Abstract: A multi-speed temperature responsive fan clutch having a planetary gear unit disposed between the drive pulley and an output shaft with there being a low speed clutch and a high speed clutch, both actuated by a temperature responsive device. There is also a speed responsive clutch locking the output shaft to the pulley at low speeds.

Abstract: A drive mechanism, particularly for household appliances, includes a driving element, a driven element and a frictional clutch coupling for frictionally transmitting motion between these two elements. The coupling includes a dished spring fixedly connected to one of these elements and frictionally engaging the other of these elements, whereby normally transmit motion between these elements. The spring is of a material which deforms upon heating so that relative motion between these elements resulting in frictional heating of the dished spring causes the same to deform out of engagement with the other element and thereby interrupt the transmission of motion between the elements.

Abstract: An electromechanical clutch for vehicle engine cooling fans includes a driving member mounted for rotation by the vehicle engine and a driven member rotatably mounted on the driving member. The driven member carries the engine cooling fan. One end of a metal band is connected to the driven member, and wraps circumferentially around the driving member in the direction of rotation of the latter. An electromagnetic coil comprising windings wound circumferentially around the driving member and rotatable therewith exert an electromagnetic force on the band when current is transmitted to the coil, drawing the band into engagement with the outer circumferential surface of the driving member, to thereby engage the clutch and cause the engine cooling fan to be rotated with the driving member.

Abstract: An apparatus is provided which is adapted to deliver or absorb variable amounts of torque or to deliver variable quantities of an incompressible fluid at a predetermined pressure. The device comprises a positive displacement pump capable of pumping a compressible fluid, an incompressible fluid or a mixture of a compressible fluid and an incompressible fluid together with appropriate pressure control and flow control mechanisms, check valve mechanisms and interconnecting duct means.

Abstract: A clutch control system for a manual transmission comprises a servo cylinder for selectively engaging a clutch engagement mechanism, and a shift valve for connecting a source of oil pressure to the servo cylinder upon shifting of the transmission to operate the servo cylinder and for connecting the servo cylinder to an oil reservoir after shifting of the transmission to release the operation of the servo cylinder. The control system further comprises a thermostatically operated valve associated with the shift valve for controlling the flow of oil discharged from the servo cylinder to the oil reservoir in accordance with changes of the oil temperature.

Abstract: A viscous fluid clutch employing a magnetic field selectively actuatable by a heat sensing device to operate a valve arm to seal an inlet passage fluidly communicating an operating chamber with a storage chamber. The clutch includes a clutch and a housing member rotatably disposed relative to one another. Each member has a shear surface. The surfaces define therebetween the operating chamber. The storage chamber is located in the housing member and is in fluid communication with the operating chamber via a discharge passage and the inlet passage. Pump means in the operating chamber displace fluid through the discharge passage from the operating chamber to the storage chamber. The inlet passage directs fluid from the storage to the operating chamber. A movable valve arm selectively seals the inlet passage. The valve arm is moved via a solenoid action in response to actuation of the magnetic field.

Abstract: A temperature controlled fluid shear coupling adapted to drive a fan for an internal combustion engine. The coupling includes a driven member defining a housing adapted to carry the fan, a drive member adapted to be driven by the engine, a working chamber defined by the driven and drive member and containing viscous fluid, a pump for removing fluid from the working chamber to a reservoir, and temperature control assembly which varies the volume of fluid in the working chamber by controlling fluid flow from the reservoir to the working chamber in response to temperature changes. The temperature control includes a wax filled power element and a valving member. The valving member blocks fluid flow from the reservoir to the working chamber when the wax is solid and allows flow to the working chamber when the wax is a liquid.

Abstract: A fluid coupling device of the type including a rotatable coupling body defining a fluid operating chamber and a coupling member rotatable relative to the coupling body. A cover is associated with the coupling body and coupling member to define a fluid reservoir chamber, and a valve is operable to control fluid communication between the operating chamber and the reservoir chamber. The valve is mounted on a shaft which is rotatable relative to the cover and the rotational position of the shaft is controlled by a bimetallic coil having one end connected to the shaft and a second end which must be fixed relative to the cover. A bracket is fixedly attached to the cover and a clip member, in movable engagement with the bracket, receives the second end of the bimetal coil to prevent substantial rotational movement of the second end relative to the bracket.