Abstract: Various embodiments include heat exchangers and methods of making heat exchangers from a series of stacked plates each made of two foil sheets bonded together in bonding locations forming fluid flow passages between the foil sheets in regions where the foil sheets are not bonded. An inlet port and an outlet port located at opposite ends of the planar extent of the two foil sheets extend through the foil sheets perpendicular to the planar extent of the foil sheets. The inlet and outlet ports provide access for a first fluid to flow into or out of the internal plate passages formed between the two foil sheets. Interstitial channels are formed between the series of plates and configured to allow the flow of a second fluid between the series of plates, allowing heat to be transferred between the two fluids while isolating the two fluids from one another.

Abstract: A cooling system differential oil contained in the housing of a differential for a vehicle. The differential includes a housing containing a first portion of differential oil. A tank contains a second portion of differential oil. An inlet passage is provided through which differential oil flows from the housing to the tank. An outlet passage is provided through which differential oil flows from the tank to the housing. A valve is disposed in the outlet passage that has a closed position preventing differential oil from flowing through the outlet passage. The valve has an open position in which differential oil is permitted to flow from the tank to the housing in response to the temperature of the differential oil in the housing exceeding a predetermined temperature.

Abstract: A transmission comprising a motor, a torque converter cover including an outside surface and an inside surface, a clutch configured to contact a portion of the inside surface of the torque converter cover, and a sprayer including a first end and a second end and configured to emit fluid on an outside surface of the torque converter is disclosed.

Abstract: An assembly includes, among other things, a front module housing an electric machine and an engine disconnect clutch, a transmission aft of the front module, a torque converter axially between the front module and the transmission, and a baffle radially between the torque converter and the transmission.

Abstract: A piston assembly for a transmission includes a piston housing and a release spring. The piston housing has a bore including a first radial wall and a circumferential wall. The release spring has a first radially outwardly extending finger portion, a second radially outwardly extending finger portion, and a conical portion. The first finger portion is for pressing engagement with the first radial wall and the second finger portion is for pressing engagement with the circumferential wall. The conical portion is disposed radially inward of the first and second finger portions. In an example embodiment, the piston housing includes a second radial wall for pressing against a clutch pack for the transmission. In some example embodiments, the piston assembly includes a seal plate, fixed to the piston housing and arranged to retain at least one piston seal.

Abstract: A device is provided for controlling at least one cooling oil flow and/or lubricating oil flow by means of at least one valve (17) for at least one cooling point and/or lubrication point (3, 4) connected to a shaft (1). The valve (17) is connected in an electrically controllable and torque-proof manner to a cooling point and/or lubrication point (3, 4). The electrical energy is able to be supplied for actuating the valve (17) without contact.

Abstract: A torque converter for converting torque between an input shaft and an output shaft includes an impeller operably connected to the input shaft and rotatable therewith. The torque converter further includes a turbine operably connected to the output shaft and rotatable therewith. A fluid flow system directs a flow of motive fluid through the impeller and through the turbine to drive rotation of the output shaft relative to the input shaft. A lockup mechanism is engageable to urge rotation of the output shaft at an output shaft rotational speed identical to an input shaft rotational speed. A switching module controls an actuation system to urge engagement of the lockup mechanism.

Abstract: The invention relates to a closure with a thermal safety function for a hydrodynamic or hydraulic machine, in particular a hydrodynamic clutch, designed for use in a housing of the hydrodynamic or hydraulic machine which holds a working medium, wherein the closure has a closure body for screwing or inserting into the housing or mounting on the housing in some other way; the closure body has a passage into which a closure core is introduced, which closure core is connected, by means of a melting element which can be melted on at a predefined temperature, directly to the closure body or to an intermediate element introduced in a seal-forming fashion in the closure body, in such a way that the passage is sealed off so as to prevent the working medium from passing through. The invention is characterized in such a way that the closure core has a blind bore or a blind hole which is open with respect to the working space, with the result that working medium can flow into the closure core.

Abstract: A drive device for a vehicle having an automatic transmission, which has a hydrodynamic torque converter. The transmission oil of the automatic transmission is used as the operating medium for the hydrodynamic torque converter. In addition, the drive device has a heat exchanger for cooling the operating medium. It is provided that additional apparatuses (heat exchangers) are provided for the direct cooling of the hydrodynamic torque converter using a cooling medium.

Abstract: The invention concerns a hydrodynamic coupling, having a pump wheel and a turbine wheel, which form together a toroidal working chamber which can be filled with working medium; with a closed working medium circuit, which extends from the working chamber via a working chamber outlet, an external circuit branch and a working chamber inlet back into the working chamber; with a storage chamber positioned outside the working chamber and outside the closed working medium circuit, for receiving the working medium evacuated from the working chamber for reducing the filling level of the working chamber, which is connected via a connection for conveying the working medium outside the working chamber to the closed working medium circuit. The invention is characterized in that the storage chamber is designed as a confined chamber which is pressure-tight to the environment, having a control pressure port so as to forcibly displace the working medium in the storage chamber with a control pressure.

Abstract: A hydraulic circuit arrangement for operating a hydrodynamic torque converter (1, 10) with a converter bridging clutch (11). The circuit arrangement comprises a hydraulic switching unit (3, 14) having at least one valve for controlling an inflow flow and a return flow of oil to the converter (1, 10) and the converter bridging clutch (11), an oil cooler (4, 15), a first line (5, 12) for acting upon the converter bridging clutch (11) with an engagement pressure (PWKzu) and a second line (6, 13) for acting upon the converter bridging clutch (11) with a disengagement pressure (PWKauf). The circuit arrangement comprises a bypass line (8, 17) which is connected directly with the oil cooler (4, 15) so as to bypass the hydraulic switching unit (3, 14).

Abstract: In a drive train device, in particular a motor vehicle drive train device, with a working fluid pressure system for providing an operating fluid pressure including at least a first and a second operating fluid pressure source connected in at least one operating state directly to the working fluid pressure system, and a lubricating and cooling fluid pressure system with an operating fluid pressure deviating from the operating fluid pressure in the working fluid pressure system, a hydraulic switching unit is provided which in at least one operating state connects the second operating fluid pressure source directly to the lubricating and cooling fluid pressure system for increasing the pressure thereof.

Abstract: A torque converter coupled to a transmission has a torque converter operating mode and a lockup operating mode. A first pump may be configured to supply transmission fluid to a plurality of electro-hydraulic transmission components. A second pump may be configured to supply transmission fluid to a lubrication system of the transmission. A valve may be configured to route transmission fluid supplied by the second pump through the torque converter during the torque converter operating mode. Means may also be provided for selectively routing at least some of the transmission fluid supplied by the first pump through the torque converter. Illustratively, transmission fluid supplied by the first pump may, but need not, be routed to the torque converter only during the torque converter operating mode or only during the torque converter operating mode if the temperature of transmission fluid exiting the torque converter exceeds a threshold temperature.

Abstract: A hydraulic control device includes an oil pan; an oil pump; a strainer; a pressure regulating valve; an oil cooler; a cooler bypass valve with an input port that is connected with a cooler supply oil passage through which the hydraulic oil to be supplied to the oil cooler flows, wherein the input port is communicatively connected with an output port when the hydraulic pressure of the hydraulic oil within the cooler supply oil passage is equal to or greater than a predetermined valve opening pressure; and a cooler bypass oil passage that connects the output port of the cooler bypass valve with an intake oil passage between the strainer and the intake port of the oil pump.

Abstract: Systems and methods of controlling automatic transmission fluid (ATF) in a vehicle include torque converter systems generally having a pump, a turbine and a stator. The stator is selectively rotated during periods of predetermined low ATF temperature, thereby causing temporarily induced inefficiencies that warm the ATF.

Abstract: The invention relates to a closure with a thermal safeguard function, comprising a closure body (1), which is used to seal a cavity (10) that is to be closed; a fusible safeguard element (2), which is inserted into the closure body and which keeps closed, at least indirectly, a through-opening (1.1), which is formed in the closure body. The inventive closure with a thermal safeguard function is characterized by the following features: the closure body comprises a bushing (3) provided with a continuous bore (3.1); the bushing is inserted into the through-opening of the closure body at an axial end (1.3) in such a way that the continuous bore and the region of the through-opening that is axially adjacent to the bushing are aligned flush with each other; the fusible safeguard element completely fills the continuous bore of the bushing over the entire cross section thereof along a given axial length.

Abstract: The invention relates to a drive device (1) for a vehicle having an automatic transmission (2), which has a hydrodynamic torque converter (5). The transmission oil of the automatic transmission (2) is used as the operating medium for the hydrodynamic torque converter (5). In addition, the drive device (1) has a heat exchanger (8) for cooling the operating medium. It is provided according to the invention that additional apparatuses (heat exchangers 11) are provided for the direct cooling of the hydrodynamic torque converter (5) using a cooling medium.

Abstract: A hydraulic control apparatus for a vehicular fluid-actuated power transmitting device provided with a lock-up clutch and an oil cooler, the lock-up clutch being operable between an engaged state and a released state according to a difference between pressures of a working fluid in an engaging fluid chamber and a releasing fluid chamber, the oil cooler being connected to a fluid passage communicating with the engaging and releasing fluid chambers, and operable to cool the working fluid, the hydraulic control apparatus including an oil cooler by-pass valve operable to permit the working fluid to by-pass the oil cooler, and a low-temperature by-pass device operable to open the oil cooler by-pass valve, for permitting the working fluid to by-passes the oil cooler, when a temperature of the working fluid is lower than a predetermined lower limit.

Abstract: A hydrodynamic clutch having a pump and turbine and a case wherein a collection bath is provided underneath the case for the collection of work medium being discharged from the case vent openings and in which the case is immersed. There is in the collection bath at least one drainage opening with a drainage flange which is positioned above the floor of the collection bath with a predetermined clearance distance from the bottom. The case is immersed so far in the collection bath that it reaches into an area underneath the drainage flange.

Abstract: A drive train having a hydrodynamic machine and a cooling medium circuit with a liquid or gaseous cooling medium. The hydrodynamic machine has at least one primary impeller, a secondary impeller, at least one control valve, and a control unit. The control unit actuates the at least one control valve in order to control the flow of the working medium into or out of the hydrodynamic machine. The secondary impeller and the at least one primary impeller form a working chamber that can be filled with a working medium. The cooling medium circuit is configured to cool the working medium and the control unit.

Abstract: The invention concerns a hydrodynamic coupling or a hydrodynamic brake with the following features: having an impeller and a turbine wheel, which together form a toroidal working chamber; the impeller sits on a driveshaft, and the turbine wheel sits on a driven shaft; having a housing, which encloses the impeller and, together with the impeller, forms a retaining space, which is conductively connected to the working chamber; having an inlet and an outlet for the filling and emptying of the working chamber; the driveshaft supports a dynamic pressure pump, which projects into the retaining space and which can be placed in rotation around the driveshaft (20); the dynamic pressure pump has an inlet in its radial outer region and is connected to the outlet by its radial inner region; a connection that is resistant to rotation can be produced and/or released again selectively between the dynamic pressure pump and the driveshaft.

Abstract: A method for the supplying bearing elements in a hydrodynamic coupling: The coupling includes a primary wheel and a secondary wheel, which together form a working area capable of being filled with operating fluid. An operating fluid system having a direct circulation connecting at least one outlet from the working area to an inlet into the working area. A filling line connectable at least indirectly to the operating fluid source. An emptying line connecting the outlet at least indirectly to the operating fluid source. The filling line and the emptying line are connected via the direct circulation to the inlet and the outlet, together with a lubricant supply system, which is capable of connection to the filling line, and which is supplied with lubricant during all operating modes. At least during the filling mode, the supply of lubricant is via the filing line that is capable of connection to the operating fluid source.

Abstract: A hydraulic system (1) for a transmission with a starter clutch is described. The hydraulic system (1) is designed to comprise a primary circuit (24) and a secondary circuit (5). A cooling system (9) for the starter clutch, a radiator (7) for hydraulic fluid and a lubricant supply (10) for the transmission are integrated into the secondary circuit (5), where the radiator (7) is arranged upstream from the cooling system (9) for the starter clutch. A volume flow of the hydraulic fluid through the radiator (7) can be limited by way of a controllable bypass line (11), which opens up into the secondary circuit (5) downstream from the radiator (7) and upstream from the cooling system (9) for the starter clutch.

Abstract: A retarder having the following features: a rotor (1) and a stator (2) that, together, form a working space (3); a hollow shaft (4) for connecting, in a rotationally fixed manner, an input shaft (5), which is near a transmission, to an output shaft (6), which is near a cardan shaft, and; the hollow shaft support s the rotor by means of a screw thread (4.1.1).

Abstract: In an assembly including a diesel engine, a fluid coupling connected to the flywheel of the diesel engine, a comminuting machine and a conveyor for feeding the comminuting machine, a fluid coupling module is common to various output power train assemblies. Slip speed of the fluid coupling between impeller input and runner output shafts is measured, and modulates or regulates the process feed rate of the conveyer. An electrically actuated control valve acts as an oil flow diverter valve directing oil into the fluid coupling impeller when a signal to engage the coupling is given, and in response to a signal from an over-temperature sensor when the temperature of circuit oil leaving the element exceeds a preset set point value, diverts the oil to a reservoir, thereby permitting the impeller and runner cavity to evacuate, which separates the engine from the load.

Abstract: In an assembly including a diesel engine, a fluid coupling connected to the flywheel of the diesel engine, a comminuting machine and a conveyor for feeding the comminuting machine, a fluid coupling module is common to various output power train assemblies. Slip speed of the fluid coupling between impeller input and runner output shafts is measured, and modulates or regulates the process feed rate of the conveyer. An electrically actuated control valve acts as an oil flow diverter valve directing oil into the fluid coupling impeller when a signal to engage the coupling is given, and in response to a signal from an over-temperature sensor when the temperature of circuit oil leaving the element exceeds a preset set point value, diverts the oil to a reservoir, thereby permitting the impeller and runner cavity to evacuate, which separates the engine from the load.

Abstract: In an assembly including a diesel engine, a fluid coupling connected to the flywheel of the diesel engine, a comminuting machine and a conveyor for feeding the comminuting machine, a fluid coupling module is common to various output power train assemblies. Slip speed of the fluid coupling between impeller input and runner output shafts is measured, and modulates or regulates the process feed rate of the conveyer. An electrically actuated control valve acts as an oil flow diverter valve directing oil into the fluid coupling impeller when a signal to engage the coupling is given, and in response to a signal from an over-temperature sensor when the temperature of circuit oil leaving the element exceeds a preset set point value, diverts the oil to a reservoir, thereby permitting the impeller and runner cavity to evacuate, which separates the engine from the load.

Abstract: A method for controlling and filling a hydrodynamic clutch. A set variable can be preset for a variable which at least indirectly characterizes the functional state of the hydrodynamic clutch and which serves as an input variable of a control device assigned to the lubricant or operating material supply system. The control device comprises a pressure balance for controlling an adjusting device for influencing the operating material supply of the hydrodynamic clutch. The set variable can be preset in order to enable the adjustment of at least three basic functional states of the hydrodynamic clutch.

Abstract: In an assembly including a diesel engine, a fluid coupling connected to the flywheel of the diesel engine, a comminuting machine and a conveyor for feeding the comminuting machine, a fluid coupling module is common to various output power train assemblies. Slip speed of the fluid coupling between impeller input and runner output shafts is measured, and modulates or regulates the process feed rate of the conveyer. An electrically actuated control valve acts as an oil flow diverter valve directing oil into the fluid coupling impeller when a signal to engage the coupling is given, and in response to a signal from an over-temperature sensor when the temperature of circuit oil leaving the element exceeds a preset set point value, diverts the oil to a reservoir, thereby permitting the impeller and runner cavity to evacuate, which separates the engine from the load.

Abstract: A fluid coupling assembly 10 is provided and includes a stationary housing 12, which h forms a first chamber 14; an inner housing or output member 16 which is rotatably disposed within chamber 14 and which forms a second chamber 18; and a rotor or drive member 20, which is rotatably disposed within chamber 18. An amount of fluid is contained within chambers 14 and 18 and is used to transmit torque between the rotor 20 and the inner housing 16. Assembly 10 further includes a pump assembly 24 which is effective to circulate the fluid through assembly 10. An electrical valve 30 is coupled to housing 12 and is effective to selectively control the flow of fluid into chambers 14 and 18. A water jacket 32 within housing 12 is used to cool the fluid flowing through assembly 10. Assembly 10 selectively transmits torque from rotor 20 to housing 16, thereby driving the rotation of a fan assembly 34.

Abstract: A drive unit for a conveyor, in particular for a belt conveyor with a driving motor, includes a hydrodynamic clutch having a pump and turbine wheel which jointly form a working chamber which can be filled with operating material. The hydrodynamic clutch can be at least indirectly coupled with a drive shaft of the conveyor. An operating material supply system is allocated to the hydrodynamic clutch and includes a closed circulation having a bypass circuit. An operating material tank is disposed in the bypass circuit and above the clutch.

Abstract: A hydrodynamic coupling having a constant quantity of working fluid, the coupling comprising, a pump wheel and a turbine wheel which together form a working space for a working fluid, a first storage chamber in fluid communication with the working space; and a valve for displacing working fluid between the working space and the storage chamber in response to an external control during operation of the coupling; and further comprising a housing which is connected, fixed for rotation, with the pump wheel, the housing including the first storage chamber, the first storage chamber being rotatable with the housing.

Abstract: A power transmission unit with at least one driving shaft that can be coupled to a driven machine includes a modular hydrodynamic coupling unit. The coupling unit includes at least two blade wheels, which together form at least one toroidal working chamber. The two blade wheels each can be connected non-rotatingly to a hub-like element, which can be connected non-rotatingly with one of the driving shaft or driven shaft. An intermediate hub is disposed between at least one blade wheel and a corresponding hub-like element. The intermediate hub is coupled non-rotatingly to the blade wheel and extends in the axial direction from the blade wheel at least to directly above an axial end wall of the housing of the coupling unit. The intermediate hub is removably securable to the coupling housing. The hub-like element forms at least one axial stop for the intermediate hub when it is mounted in the housing.

Abstract: A power transmission has a hydraulic control from which oil is distributed to various transmission components, a cooler and reservoir. A flow direction control valve is disposed in the distribution system to direct oil in transit to the reservoir during cold operation and to a transmission lubrication circuit or cooling circuit during normal operating temperatures.

Abstract: The invention relates to a method for operating a drive unit for a conveyor system, in particular for a chain conveyor drive with at least one driving machine and at least one hydrodynamic clutch. The hydrodynamic clutch can be filled with operating medium in which, during continuous operation, the operating medium is guided in a closed circuit. The circuit includes an inlet line associated such that the operating medium losses in the circuit are compensated for and in which the temperature in the closed circuit is ascertained and compared with a permissible temperature value. The invention includes the feature that upon exceeding an permissible temperature value in the closed circuit, the inlet line and the outlet line are simultaneously connected in the circuit for the purpose of volumetric cooling.

Abstract: A cooler bypass valve, located in a hydraulic circuit between the discharge side of a torque converter and lubrication circuit, includes a valve spool urged by feedback pressure acting in opposition to the force of a compression spring to a bypass cooling mode position where the converter discharge fluid flow is connected to the lubrication circuit bypassing the oil cooler. The bypass valve includes a viscosity-sensitive pressure divider, which includes a series arrangement of a laminar orifice and a sharp-edged orifice located between the converter discharge and an oil sump. As oil temperature increases, flow through the laminar orifice produces a control pressure in opposition to the feedback pressure and additive to a spring force, which combine to move the valve spool to a cooling mode position where substantially all of the converter discharge is directed through the oil cooler.

Abstract: A hydraulic system for a torque converter is disclosed which has a converter chamber and a lock-up clutch dividing the converter chamber into a converter pressure section and a back-up pressure section. A lock-up control valve is provided, which has a first position wherein pressurized hydraulic fluid is supplied to the converter chamber and a second position wherein fluid is discharged from the back-up pressure section. A drain passage with a bimetal orifice normally closes the drain passage and is operative to open the drain passage when a temperature of the fluid in the drain passage is higher than a predetermined temperature.

Abstract: A hydraulic retarder is disposed to receive fluid as directed by a flow valve to selectively retard vehicle motion. The flow valve responds to an operator controlled modulator valve to direct fluid from a cooler which is supplied from a torque converter to the hydraulic retarder upon a request by the operator. A modulator valve is also effective to control the pressure of the fluid exiting the cooler and entering the retarder.

Abstract: A disengageable connection between an internal combustion engine and a propeller which serves for the drive of a gyroplane. The disengageable connection is a fluid coupling which includes a controllable oil circulatory system. The fluid coupling is supplied with oil by way of the oil circulatory system during the operation of the internal combustion engine. By contrast, the oil escapes out of the fluid coupling when the propeller operates under auto-rotation.

Abstract: A control system for a hydraulic retarder includes an inlet regulator valve and an outlet regulator valve. The inlet regulator valve admits fluid to the retarder at a predetermined pressure. The outlet regulator valve prevents fluid flow from the retarder unless the main system pressure is greater than a predetermined value.

Abstract: A hydrokinetic coupling has a primary vane wheel (11) and a secondary vane wheel (12), which define a toroidal working chamber. A shell (17) rotates with the primary vane wheel and envelops the secondary vane wheel. A constantly open and throttled outlet port (31) and an outlet valve (32) are disposed within the shell. The outlet valve can be closed by means of fluid pressure generated in a control line (33). In accordance with the invention, the control line has a fluid inlet (34) which is disposed in the shell interior. This is arranged at a determined distance from the axis of rotation of the coupling, so that fluid can only penetrate into the control line (33) if the slip in the coupling has assumed a specific minimum value. In this condition the outlet valve (32) is consequently closed, whereas it is opened at greater slip values.

Abstract: An automatic transmission has a torque convertor, an inlet passage connecting between an oil inlet of the torque convertor and an outlet of a hydraulic pump driven by an engine, and an outlet passage connecting between an oil outlet of the torque convertor and an oil tank, the outlet passage being provided at its intermediate portion with an oil cooler. The warming up of the transmission after start up in a cold state is promoted by a warm-up promotion device which comprises a by-pass passage branched from the outlet passage at a portion upstream of the oil cooler and leading to the oil tank, and a by-pass valve associated with the by-pass passage and adapted to open the by-pass passage during warming up of the automatic transmission.

Abstract: A scoop controlled fluid coupling has a toroidal working circuit W defined by vaned impeller and runner elements 11,12. Working liquid is supplied to the working circuit W from a rotating reservoir 9 by an adjustable scoop tube 15 having a scooping orifice 16, the radial position of which is to determine the degree of filling of the circuit W. To counteract unintentional changes in the filling due to thermal expansion of the liquid, the runner diameter is about 10% smaller than that of the impeller, and the runner has two sets of holes 54,55 which permit liquid to escape from the circuit.

Abstract: A fluid circuit for a hydrodynamic coupling comprises a circuit line which is connected to the outlet of the coupling and which extends via a cooler and via a flow control element back to the inlet of the coupling. An overflow valve serving for limiting pressure and the delivery line of a filling pump are connected to the circuit line in front of the flow control element in the flow direction. Arranged in the delivery line are a fixed-setting throttle element, for example a diaphragm, and, parallel to this, a high-speed filling valve which opens automatically when the pressure prevailing in the circuit line in front of the flow control element falls below a specific limiting value.

Abstract: A control system has two fixed-displacement pumps for supplying pressurized fluid to a pair of steering cylinders via a steering valve and to a pair of implement cylinders via an implement valve. Connected next to the pumps is a demand valve which is pilot operated to deliver to the steering cylinder pair the pressurized fluid from only one pump upon slight displacement of the steering valve and the pressurized fluid from both pumps upon greater displacement of the steering valve. The demand valve is further pilot operated to deliver to the implement cylinder pair the pressurized fluid from only one pump when the implement valve is actuated in a direction to lower the implement assembly, and the pressurized fluid from both pumps when the implement valve is actuated in a direction to raise the implement assembly.

Abstract: A hydrodynamic reversing transmission wherein each of the forward and reverse drive trains between the input and output shafts has a starting torque converter with a stationary housing, a rotary turbine wheel and a set of adjustable guide vanes. The draining lines of the torque converters have inlet portions which are connected with the respective housings and are oriented in such a way that the direction of fluid flow therein is identical with or closely approximates the direction of fluid flow between the adjacent blades of the turbine wheel when the respective torque converters are operated within the counterbraking range. Each inlet portion has an aperture which is in permanent communication with the sump. The ratio of the outer diameter to the inner diameter of each turbine wheel is between 1.1 and 1.25, and the ratio of distances between the tips of neighboring blades of the turbine wheel to the outer diameter of the turbine wheel is between 0.06 and 0.09.

Abstract: A hydraulic retarder, especially for an automotive vehicle, comprising a control valve which regulates the pressure of the hydraulic fluid supplied to the decelerator which can be connected to a heat exchanger for dissipating the thermal energy generated by the retardation of the vehicle. According to the invention a regulating valve is additionally provided for controlling the maximum pressure in dependence upon temperature and in response to a temperature sensor. The device thus limits the maximum retarder effect in accordance with the temperature of the hydraulic medium and hence the utility of the heat exchanger to dissipating the braking energy.

Abstract: A pressure regulating device for use in a hydraulic control system for an automatic transmission having a torque convertor, a gear transmission and an hydraulic control system provides a first pressure regulating valve for regulating the pressurized fluid output from a pump to a line pressure level, and applying the line pressure to the hydraulic control system. A second pressure regulating valve regulates the pressure of an excess portion of fluid supplied to the hydraulic control system from the first pressure regulating valve, and supplies the excess fluid to the torque convertor and regions requiring lubrication. Overheating of fluid in the torque convertor is prevented at low pressures by a bypass passage which assures at least a minimum fluid flow through the torque convertor at all times.

Abstract: A power transmission for an automobile, which is provided with an oil circulation type fluid coupling and a clutch mechanism so that power may be transmitted from an output shaft of an engine to an input shaft of a gear transmission. The output and input shafts support an intermediate shaft to which a pump at the fluid coupling is rotatably supported, so that a partition for supporting the intermediate shaft is eliminated. At the fluid coupling are provided an oil-charge passageway for charging to the fluid coupling a part of lubricating oil for the engine and an oil-return passageway for collecting into an engine oil pan the oil flowing out of the fluid coupling.

Abstract: A hydraulic torque converter with a toroidal space bounded by a pump member, a turbine member and a free-wheeling stator has an inlet channel for fresh transmission fluid (oil) which opens into the pump torus at a location spaced from the pump member, preferably via the stator, whereby the relatively cool volume of newly admitted fluid mingles with the fluid already present instead of being immediately centrifugated toward the peripheries of the pump and turbine members from which it would quickly return to the sump. The inlet channel may include one or more radial passages in a spacer ring separating the stationary races of the journal bearings by which the pump member and the stator are supported on a trunnion rigid with the converter housing.