Abstract: A system for preventing the overheating of an electromagnetic clutch of an internal combustion engine mounted on a vehicle caused by slipping of the clutch for a considerably long time. The electromagnetic clutch has a drive member secured to a crankshaft of the internal combustion engine, a driven member adjacent to the drive member, and a magnetizing coil provided in one of said members. The heat quantity generated in the clutch is calculated by an operation circuit. A clutch current control circuit is provided such that when the heat quantity exceeds a predetermined value, the electromagnetic clutch is applied with a rated clutch current to engage the clutch without slipping for preventing overheating by the slipping.

Abstract: A vehicle electronic control system for a friction clutch having a clutch position signal generator which senses the vehicle operating conditions and produces a command signal which dictates the state of engagement of the clutch. A clutch actuator control is responsive to the command signal, and includes a transducer that produces a feedback signal indicative of clutch position which is fed into a comparator for comparison with the command signal. The feedback signal is modified by a signal derived from a wear compensator to alter the feedback signal as the clutch wears.

Abstract: A system for controlling an electromagnetic clutch of an internal combustion engine mounted on a vehicle, the clutch having a drive member secured to a crankshaft of the internal combustion engine, a driven member adjacent the drive member, and a magnetizing coil provided in one of said members, and a transmission secured to the driven member. A pulse generating circuit is provided for producing output pulses in dependency on the speed of the engine. An idling speed detecting circuit and a correcting circuit are provided for producing a correcting output when the idling engine speed increases which is caused when the choke valve or the air conditioning device of the vehicle is operated. Gate means is responsive to the output of the pulse generating circuit for producing an output which is applied to a switching transistor. The transistor is turned on by the output, so that clutch current passes through the magnetizing coil for engaging the clutch.

Abstract: A system for controlling an electro-magnetic clutch of an internal combustion engine mounted on a car which is capable of controlling the clutch current after the gear-changing for providing the partial engagement of the clutch. The electro-magnetic clutch has a drive member secured to a crankshaft of the internal combustion engine, a driven member adjacent the drive member, which is coupled to a transmission of the car and a magnetizing coil provided in one of the members. A shift lever signal is provided during the operation of the shift lever of the transmission and an acceleration signal is provided according to the operation of the accelerator pedal of the car. A control circuit comprises a charging circuit operated by the shift lever signal, a standard voltage circuit responsive to the acceleration signal, and a comparator connected to the charging circuit and standard voltage circuit for producing an output signal for a period of time which is decided by the level of the acceleration signal.

Abstract: A bearing unit comprises a first shaft carrying the bearing proper, a second shaft extending coaxially at least partly within the first shaft and cooperating with the load, and a shaft coupling device which engage the two shafts with each other in both the axial and the radial direction. The device can be disengaged if the second shaft is exposed to an undesirable load, such as impacts or vibrations, in order to protect the bearing proper.

Abstract: A hydraulic torque converter which comprises a pump wheel having an engine output shaft coupled thereto, and a turbine wheel having a turbine output shaft connected thereto, wherein the turbine wheel is coupled to the pump wheel through a fluid coupling for the transmission of power therebetween. A one-way clutch and an on-off clutch are connected in series, the serially connected clutches being connected between the pump wheel and the turbine wheel. When the on-off clutch is engaged and the one-way clutch is engaged, the turbine wheel is mechanically coupled to the pump wheel for the transmission of power thereto.

Abstract: A damper disc applicable to a clutch disc comprising a hub flange; a pair of annular side plates; a pair of annular sub-plates disposed between the side plates and the flange; stud pins connecting the subplates together; recesses formed at middle portions of the side edges of the openings in the flange, each stud pin passing through each recess with a space corresponding to a torsion angle for first hysteresis torque between the stud pin and the side edge of the recess; stop pins connecting the radially outer portions of the side plates together; notches formed at outer edges of the openings in the flange, each stop pin passing through each notch with a space corresponding to a maximum torsion angle between the stop pin and the side edge of the notch; and thereby, a maximum torsion angle can be set large, and the sub-plates can operate stably.

Abstract: The hydraulic control system of this invention uses a series of hydraulic valves for directing hydraulic fluid to energize and pressurize rapidly the various clutches of a hydraulically driven transmission, while protecting the input clutch of the pump. A restrictor check valve slows the rate at which the input clutch disengages the pump from the power takeoff, thereby ensuring that the variable displacement pump destrokes during backdriving before the input clutch disengages. A sequence valve is ordinarily used to ensure that the winch is deactivated by dumping pressure in the system and by destroking the pump when control pressure in the system drops below a predetermined level. The hydraulic controls include a single-lever, four-function control valve for selecting four modes of operation: brake-off, reverse, free-spool, and forward, and a range selector for selecting between high and low range. Three three-way valves are used to shuttle hydraulic fluid to the main drive clutches (i.e.

Abstract: A system for controlling an electro-magnetic clutch of an internal combustion engine mounted on a vehicle, which is capable of eliminating residual magnetism during operation of a shift lever of a transmission. The electro-magnetic clutch has a drive member secured to a crankshaft of the internal combustion engine, a magnetizing coil provided in the drive member and a driven member adjacent said drive member. A neutral switch is provided for detecting when the shift lever is in a neutral position and a shift lever switch is provided for producing a signal during operation of the shift lever for the transmission. Both signals of the neutral switch and the shift lever switch are fed to a control circuit. The control circuit is so arranged that the current flowing through the magnetizing coil is inverted in dependency on the output signals of the neutral switch and shift lever switch, so that the residual magnetism in the clutch may be eliminated.

Abstract: In a coupling for a drive device, such as an internal combustion engine, a rotor and an entraining disc are connected. The entraining disc is movable relative to a drive disc so that it can be selectively coupled with the drive disc. A housing at least partly encloses the drive disc and supports a pressure chamber adjacent the entraining disc. The pressure chamber includes a movable cover interconnected with the entraining disc. By regulating the pressure within the chamber, the entraining disc can be coupled or decoupled relative to the drive disc. When coupled to the drive disc, the entraining disc drives the rotor.

Abstract: A clutch system for an oil-lubricated clutch mechanism including an oil reservoir, oil pump means, and a control valve device whereby oil from the reservoir is directed to the clutch when the clutch is engaged, with the oil being returned to the reservoir when the clutch is disengaged, the control valve device being operated by fluid pressure such as compressed air.

Abstract: A system for controlling an electro-magnetic clutch of an internal combustion engine mounted on a vehicle, which has a drive member secured to a crankshaft of the internal combustion engine, magnetizing coil provided in the drive member, a driven member adjacent to the drive member, and a transmission secured to the driven member having multi-stage change gears. A car speed sensor is provided for producing an output signal when the speed of the vehicle exceeds a predetermined speed and a transmission sensor is provided for producing an output signal when a change gear having a small reduction ratio, such as 3rd- or 4th-gear, is selected. A pulse generator is provided for producing an output signal in proportion to the ignition pulse of the engine and an electric circuit is provided for controlling the current passing through the magnetizing coil in dependency on the output signal of the pulse generator.

Abstract: The present invention discloses a pneumatic clutch suitable for a heavy automobile. The clutch comprises a flywheel; a clutch cover fixed to the flywheel; a pressure plate axially movably connected to the clutch cover; a clutch disc disposed between the flywheel and the pressure plate and splined to an output shaft; an annular pneumatic actuator disposed between the pressure plate and the clutch cover and operable to force the pressure plate against the clutch disc; and a pneumatic line including an inching valve and a rotary joint around the output shaft and connecting a compressed air source to the actuator, said inching valve being connected to a clutch pedal and being operable to reduce a pneumatic pressure supplied to the actuator in accordance with lowering operation of the pedal.

Abstract: A control apparatus for a vehicle transmission is provided which has at least two transmission trains, which includes a high speed transmission train and a low speed transmission train. The low speed transmission train includes a one-way clutch. Each of the transmission trains have a clutch therein. The control apparatus comprises a hydraulic circuit coupled to the clutch and a creep-preventer which is coupled to the hydraulic circuit for operating in response to the idling of the vehicle engine when the vehicle is stopped, and to make the one-way clutch inoperative to prevent transmission of power through the low speed transmission when the clutch of the high speed transmission is engaged, to thereby permit operation of the clutch of the low speed transmission train without the transmission of power therethrough.

Abstract: A hydrodynamic clutch, such as a hydrodynamic torque converter, is rotatable about an axis of rotation and includes a pump wheel impeller, a turbine impeller, and a guide wheel located between the pump wheel impeller and the turbine impeller. A bridging clutch mechanically couples the pump wheel impeller and the turbine impeller. The bridging clutch has a torque transmission part which includes a torsional vibration damping device located between the pump wheel impeller and the turbine impeller. The damping device has at least one circumferentially extending spring located between stops spaced circumferentially about the axis of rotation.

Abstract: A direct coupled clutch is provided in parallel to a fluid type torque converter in an automatic transmission, and supply of oil pressure to a hydraulic servo of the direct coupled clutch is controlled by an electromagnetic valve. Alteration of engaging condition of engaging elements in a transmission gear is carried out by maintaining the direct coupled clutch in the disengaging condition. As a result, difference of torque between the engine side of the engaging elements and the drive wheel side, which difference is produced in the speed change, is absorbed by the fluid type torque converter so that impact is restrained.

Abstract: Automatic clutch control to reduce shocks to a vehicle during a rapid switching of a shift lever between its drive D and reverse R positions. The shift lever position and the direction of movement of the vehicle are detected by means of a switch and an electrical circuit. A microprocessor delays the initiation of the clutch engagement by a given time as compared with the clutch engagement occurring when the vehicle is at rest, if the shift lever position is in contra-distinction to the direction of movement of the vehicle, namely, when the shift lever is in its drive D position while the vehicle is moving backward or when the shift lever is in its reverse R position while the vehicle is moving forward.

Abstract: A shift lever control device for an automotive transmission by which a shift lever can be shifted from a Park position to a Reverse position or vice versa only when the park brake is in opertion and the engine has been started. The control device comprises a shift lever control means having a plunger and an electromagnetic actuation mechanism, an ignition key switch and a park brake switch, in addition to a conventional shift lever device having a shift lever, a position plate, a pin, and so forth. The ignition key switch, the park brake switch, and the electromagnetic mechanism are connected in series between a power supply and ground, so that if the park brake is released or the engine turned off, the electromagnetic mechanism is operated to actuate the plunger to drive the pin of the gear shift level into engagement with a Park position slot. The control device is also intended to prevent the dangerous situation when the shift lever is accidentally set to the park position while the engine is running.

Abstract: A safety coupling for rapidly stopping a cutting tool or the like upon the de-energization of a driving motor includes an axially movable shell rotating together with a driven shaft and having a flange pressed by a spring toward a frictional braking element. Two parallel cams of generally triangular outline are articulated by their respective vertices to a drive shaft and, in a central position, are aligned with a common axis of the drive and driven shafts. On starting the motor, the resulting differential torque causes a relatively inverse tilting of the cams around a transverse axle whereby they axially shift the shell, against the force of the spring, and release its flange from the braking element. As soon as the motor is cut off, the differential torque vanishes and the cams regain their initial central position whereby the driven tool is arrested.

Abstract: A control mechanism for a differential lock having a control pedal isolated from the operating mechanism for engaging the differential. A platform resiliently mounted on the vehicle allows relative movement between the platform and the chassis. A foot operated control element mounted on the platform extends through the platform to a point adjacent an operating mechanism on the vehicle chassis. The operating mechanism selectively operates the differential lock control valve and in its retracted position completely disengages the operating mechanism. The differential lock valve is maintained by a detent in its actuating position and can be released by operating a brake system having a relay valve in the differential lock valve. When the brake system is operated, the relay valve releases the detent means in the differential lock valve allowing the valve to return to its differential release position and the operating mechanism to return to its retracted position.